Coilcraft CST2020 Series Current Sense Transformers

CST2020 Series Current Sense Transformers

Courtesy of Coilcraft : CST2020 Series Current Sense Transformers

  • Sensed current up to 40 Amps
  • For use between 400 Hz to 1 MHz
  • Very low primary resistance
  • AEC-Q200 Grade 1 (−40°C to +125°C)
  • Meets Reinforced Insulation per UL 60950-1.
  • 4000 Vrms, one minute isolation (hipot) winding to winding
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations

Core material Ferrite
Terminations Tin-silver over tin over phos bronze (pins 1 – 3);
Tin-silver over tin over nickel over phos bronze (pins 4 – 5)
Weight 7 – 8.5 g
Ambient temperature –40°C to +125°C
Maximum part temperature +165°C (ambient + temp rise)
Storage temperature Component: –40°C to +165°C.
Tray packaging: –40°C to +80°C
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging 100 per tray
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.


Rounding up Custom MMIC Best GaN RF Power Amplifier MMICs

Courtesy of Custom MMIC : Best GaN RF Power Amplifier MMICs

The power of GaN MMIC technology is strongest when applied to RF power amplifier MMICs. Here we quickly review some of our power amplifier MMIC successes with GaN.

The CMD262 is a 5 W GaN MMIC power amplifier die ready for Ka-band systems where high power and high linearity are a must. This MMIC amplifier delivers greater than 26 dB gain with a corresponding output 1 dB compression point of +37.5 dBm and a saturated output power of +38.5 dBm at 30% power added efficiency. It is a 50-ohm matched design eliminating the need for external DC blocks and RF port matching.

The CMD216 is a 5.6 W GaN MMIC power amplifier ideally suited for Ku band communications where high power and high linearity are once again crucial. This GaN power amplifier MMIC chip delivers greater than 16 dB of gain with a corresponding output 1 dB compression point of +37 dBm and a saturated output power of +38 dBm at 32% power added efficiency. The CMD216 amp is a 50-ohm matched design also offers full passivation.

The CMD184 is the best rf and microwave power amplifier MMIC chip in its category and is one of our best selling and most popular devices. It is a 4.5 W wideband GaN MMIC power amplifier die which operates from 0.5 to 20 GHz. It delivers greater than 13 dB of gain with a corresponding output 1 dB compression point of +34.5 dBm and a saturated output power of +36.5 dBm. The CMD184 power amplifier MMIC is a 50-ohm matched IC design, eliminating the need for RF port matching.

nRF Connect for Cloud

Nordic Semiconductor launches nRF Connect for Cloud enabling developers to evaluate, test, and verify their Cloud-connected wireless IoT designs

Courtesy of Nordic Semiconductor : nRF Connect for Cloud enabling developers to evaluate, test, and verify their Cloud-connected wireless IoT designs

Service for Cloud-based evaluation of Bluetooth Low Energy designs simplifies integration of Nordic products into larger systems making up the IoT

Nordic Semiconductor today announces that it has launched ‘nRF Connect for Cloud’, a free service for Cloud-based evaluation, test, and verification of Bluetooth® Low Energy (Bluetooth LE) designs employing Nordic’s nRF51 and nRF52 Series multiprotocol Bluetooth LE Systems-on-Chip (SoCs).

nRF Connect for Cloud features an intuitive workflow and offers much of the functionality of Nordic’s ‘nRF Connect for Desktop’ and ‘nRF Connect for Mobile’ which are popular applications used for building and developing Bluetooth LE products. nRF Connect for Cloud also supports an extensive range of standard Bluetooth services together with proprietary services such as nRF UART.

Operating with all popular browsers, nRF Connect for Cloud uses Web Bluetooth application programming interfaces (APIs) to push and extract data to and from the Cloud, enabling the developer to test and modify the behavior and performance of prototypes. By using the front-end and visualization features of nRF Connect for Cloud, historical data can be extracted from databases and analyzed in a browser. The product also allows engineers to monitor and interact with remote wireless Internet of Things (IoT) designs enabling the collaboration of geographically separate development teams on a single project.

nRF Connect for Cloud is supported by the nRF Gateway App available for iOS and Android-powered mobile devices. The nRF Gateway App enables Nordic Bluetooth LE devices to use a smartphone-enabled Internet gateway to convert Bluetooth LE messages to ReST/MQTT/IP protocols for Cloud interoperability.

The Gateway App communicates with the nRF Connect for Cloud back-end hosted on Amazon Web Services (AWS) and is based on Software as a Service (SaaS) components. By leveraging AWS industry-grade components, the app implements end-to-end data and device connectivity, guarantees reliability, and scales from a few to hundreds of Bluetooth LE devices.

nRF Connect for Cloud currently supports Bluetooth LE solutions but future versions will also support Nordic’s nRF91 Series low power, global multimode LTE-M/NB-IoT System-in-Package (SiP) for cellular IoT. Following Nordic’s established strategy of constant enhancements to its development tools, planned updates for the nRF Connect for Cloud will reinforce its position as an indispensable tool for wireless IoT development teams working with Nordic products.

“nRF Connect for Cloud is a great asset for the rapidly expanding number of development teams building distributed IoT systems that use Bluetooth and other wireless connectivity technologies to connect to the Cloud and back-end systems,” says John Leonard, Product Marketing Manager, Nordic Semiconductor. “The product shortens the previously time-consuming migration from device-to-smartphone to device-to-Cloud connectivity and simplifies integration of Nordic wireless products into the larger systems that make up the IoT.”

nRF Connect for Cloud works out-of-the-box with the Nordic Thingy:52 IoT Sensor Kit, Nordic nRF5 development kit (DK), and software development kit (SDK) examples. A quick-start guide is available from

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Coilcraft LPD8035V

Miniature 1:1 coupled inductors provide 1500 Vrms isolation between windings

Courtesy of Coilcraft : LPD8035V High-Isolation Miniature Coupled Inductors

LPD8035V Series Miniature 1:1 coupled inductors provide 1500 Vrms, one-minute isolation (hipot) between windings.

  • Ultra-small package size 8.0 × 6.4 × 3.5 mm
  • 1500 Vrms, one minute isolation (hipot) between windings
  • Provides significant size and cost reductions over conventional bobbin-wound alternatives
  • 13 inductance values ranging from 4.7 to 150 µH
  • Peak current ratings up to 2.7 Amps – a 40% increase over previous generation products
  • Tight coupling coefficient: K > 0.97
  • Ideal for Flyback, SEPIC and isolated-Buck converter designs
  • AEC-Q200 Grade 3 qualified (-40°C to +85°C)

Click here for full specs and free samples!

Coilcraft 0201AF

Coilcraft 0201AF (0603) Wirewound Ferrite Beads

Courtesy of Coilcraft : 0201AF (0603) Wirewound Ferrite Beads

  • Higher performance than other surface mount ferrite beads in the market
  • High impedance across a wide bandwidth; up to GHz band
  • Ferrite construction and heavy gauge wire for high current handling
  • Extremely low DCR for high current applications – as low as 0.15 Ohms
  • Eliminates high frequency noise in power supplies or RF signal isolation applications
  • RoHS Compliant, halogen free. 260°C compatible. Matte tin over nickel over
    silver-platinum-glass frit
  •  PDF data sheet


What are Ferrite Beads?

Ferrite beads are used as low pass filters to eliminate high frequency noise while allowing low frequency signals or DC current to pass through a circuit. The noise may come from any number of sources including high-frequency switching noise from a power-supply circuit or RF noise in an RF signal-isolation circuit that must be minimized to ensure both signal integrity and antenna efficiency.

Ferrite beads, whether chip or wirewound, are used to filter electromagnetic interference (EMI). You may be surprised to discover that wirewound ferrite beads provide a high magnitude of attenuation over a wide frequency range, whereas traditional thick-film chip ferrite beads have limited options for both attenuation and frequency range.

Wirewound Versus Traditional Chip

In addition to offering better attenuation and frequency performance than their chip counterparts, wirewound ferrite beads also provide lower DC resistance (DCR) and higher current ratings without core saturation, resulting in the highest possible performance in the smallest size.

Wirewound versus Traditional Chip

Coilcraft wirewound ferrite beads come in standard package sizes from 0201 (0603) to 1812 (4532), all providing extremely low DCR while maintaining high filtering impedance over the broadband frequency range. These features enhance the performance of the choke circuit while potentially reducing board space by replacing a larger chip ferrite bead with an equivalent, or higher-performing wirewound ferrite bead.

Figures 2 and 3 demonstrate how Coilcraft wirewound ferrite beads provide superior broadband performance compared to both low- and high-DCR chip ferrite beads. Figure 2 compares the Coilcraft 0402DF-12 wirewound ferrite bead to the lowest-DCR 0402-sized chip ferrite bead. The 0402DF offers higher impedance across the frequency range, providing a greater measure of filtering from 100 MHz and above. Compared to typical high-DCR chip ferrite beads, the Coilcraft wirewound ferrite bead maintains the same high frequency attenuation while providing higher current ratings and 40 percent better DCR.

Wirewound versus Traditional Chip Wirewound versus Traditional Chip
Figure 2 Figure 3

What Types of Ferrite Beads does Coilcraft Manufacture?

  • Ferrite construction for higher current handling
  • Higher inductance values than other inductors
  • Low Losses for low frequency filter applications
  • RoHS Compliant, halogen free, 260°C compatible
  • Samples are available in Coilcraft Designer’s Kits
  • Click on a table row below for detailed information
    about each ferrite bead series
Series Size Max Height Impedance Range (Ohms) AEC-Q200
0201AF 0201 (0603) 0.18 mm 19.89 – 118.6 @ 100 MHz
159.9 – 1,089 @ 900 MHz
026011F 0201 (0603) 0.25 mm 91.52 – 320.5 @ 100 MHz
747.2 – 3,435 @ 900 MHz
0402DF 0402 (1005) 0.66 mm 11.98 – 5,270 @ 100 MHz
93.76 – 7,628 @ 900 MHz
0402AF 0402 (1005) 0.66 mm 11.23 – 331.3 @ 100 MHz
82.23 – 3,593 @ 900 MHz
0603AF 0603 (1608) 0.91 mm 8.83 – 3,807.7 @ 100 MHz
48.14 – 6,332 @ 900 MHz
0603LS 0603 (1608) 1.12 mm 28.21 – 5,760 @ 100 MHz
27.89 – 3,815 @ 900 MHz
Grade 3
0805AF 0805 (2012) 1.52 mm 65.61 – 7,069 @ 100 MHz
26.14 – 2,451 @ 900 MHz
0805LS 0805 (2012) 1.60 mm 48.54 – 7,765 @ 100 MHz
28.82 – 2,265 @ 900 MHz
Grade 3
1008AF 1008 (2520) 1.91 mm 6.09 – 66.51 @ 1 MHz
59.29 – 721.8 @ 10 MHz
1008LS 1008 (2520) 2.03 mm 6.56 – 682.9 @ 1 MHz
63.95 – 7,511 @ 10 MHz
Grade 3
1812LS 1812 (4532) 3.43 mm 77.85 – 7,167 @ 1 MHz
770.7 – 191,219 @ 10 MHz


Ferrite Bead Finder

Ferrite Bead Comparison


S-Parameter and Spice Models

Designer’s Kits

Related Application Notes

Inductors as RF Chokes

LC Filter Reference Design

Custom MMIC CMD283C3

Announcing our Breakthrough GaAs and GaN MMICs

Courtesy of Custom MMIC : Announcing our Breakthrough GaAs and GaN MMICs

We are proud to announce our industry-first Ultra Low Noise Amplifier (ULNA) MMIC. The CMD283C3 provides an incredible 0.6 dB noise figure, outperforming all other LNA MMICs, and rivaling discrete component implementations. It operates over a frequency range of 2 GHz to 6 GHz (S & C-band) and has output IP3 of +26 dBm.

Four members of our new GaAs MMIC digital attenuator family are also being introduced. The CMD279 and CMD280 operate up to 30 GHz with 5-bit control. Attenuation range is up to 15.5 dB. Two, 2-bit attenuators, the DC-35 GHz CMD281 and DC-40 GHz CMD282, offer coarser control in 2 and 4 dB steps respectively. All four devices offer input IP3 of +42 dBm.

Our latest Distributed Amplifier, the DC-20 GHz CMD249P5, offers a positive gain slope with nominal 12 dB gain. The GaAs device features output Psat of +30 dBm and output IP3 of +38 dBm.

We also continue to enhance our line of unique low phase noise amplifiers (LPNAs). Responding to customer requests to assist in reducing unwanted phase noise and improve signal integrity and target acquisition in military radar systems, these LPNAs operate up to 40 GHz and offer low phase noise performance down to -165 dBc/Hz at 10 kHz offset. They serve as Local Oscillator (LO) drivers or receiver amplifiers in a variety of phased array radar, EW, military radio, instrumentation, and aerospace and space communication designs.

MMIC releases on our horizon include more ultra-low noise amplifiers and digital attenuators, as well as broadband distributed power amplifiers and GaN mixers.

Qorvo QPM1002

QPM1002 Front End Module by Qorvo

Courtesy of everything RF : Front End Module by Qorvo

The QPM1002 is a GaN MMIC front-end module that operates from 8.5 to 10.5 GHz. The MMIC has a T/R switch, low-noise amplifier, and a power amplifier. The receive path provides a gain of 25 dB with a low noise figure of 2.2 dB. The transmit path provides a small signal gain of 33 dB, it can deliver 3 W of saturated power with a PAE of 32%, with a 25 dB of large signal gain. The FEM can handle up to 2 W of input power into the ANT port eliminating the need for a limiter.

It is available in a 5 x 5 mm QFN surface mount package with over-mold encapsulant, coupled with a proprietary die-attach process and is ideal for X-Band radar applications.

Product Specifications

Product Details

  • Part Number : QPM1002
  • Manufacturer : Qorvo
  • Description : 8.5 to 10.5 GHz GaN Transmit / Receive Module

General Parameters

  • Type : Transmit / Receive Module
  • Configuration : Low Noise Amplifier, Power Amplifier, Transmit/Receive(T/R) Switch
  • Frequency : 8.5 to 10.5 GHz
  • Tx Power : 35 dBm
  • Tx Gain : 33 dB
  • Rx Gain : 25 dB
  • Rx Noise Figure : 2.2 dB
  • Package Type : Surface Mount
  • Package : QFN
  • Dimensions : 5 x 5 x 0.85 mm
RF Variable Attenuator

CMD282 RF Variable Attenuator by Custom MMIC

Courtesy of everything RF : RF Variable Attenuator by Custom MMIC

The CMD282 from Custom MMIC is a 2-bit Digital Attenuator that operates from DC to 40 GHz. Each bit of the attenuator is controlled by a single voltage of either 0 V or –5 V. The attenuator bit values are 4 dB and 8 dB, for a total attenuation of 12 dB. The CMD282 has a low insertion loss of 1.5 dB at 18 GHz and the attenuation accuracy is typically 0.1 dB step error. It is matched to 50 ohms and is available as a die that offers full passivation for increased reliability and moisture protection.

Product Specifications

Product Details

  • Part Number : CMD282
  • Manufacturer : Custom MMIC
  • Description : 12 dB, 2-Bit Digital Attenuator from DC to 40 GHz

General Parameters

  • Type : Digital
  • Frequency : DC to 40 GHz
  • Bits : 2 Bit
  • Channels : 1 Channel
  • Configuration : Solid State
  • Attenuation Range : 12 dB
  • Attenuation Accuracy : 0.2 to 1 dB
  • Power : 27 dBm
  • P1dB : 23 dBm
  • IIP3 : 42 dBm
  • Insertion Loss : 1.5 dB
  • Switching Time : 25 ns
  • Supply Voltage : -5 V
  • Control Voltage : -5 to 0 V
  • Interface : TTL/Serial/Parallel
  • Return Loss : 18 dB
  • Input Return Loss : 18 dB
  • Output Return Loss : 18 dB
  • Package Type : Die
  • Operating Temperature : -55 to 85 Degree C
  • Storage Temperature : -55 to 150 Degree C
  • RoHS : Yes
Connected City

Connecting cities to the information age

Courtesy of u-blox : Connecting cities to the information age

Studies show that by 2020, cities will have nearly 1 billion smart meters and that 50 million street lights will be smart street lights. Let’s highlight the key market drivers fueling this Smart City application growth.


A preliminary requirement for a Smart City investment is sustainability. The technologies used to operate these cities must enable clean energy initiatives to create a greener, more environmentally‑friendly city that successfully meets energy, emission, and waste reduction goals. Examples include optimization of pickup routes in waste management, parking systems to reduce driving time in search for an available spot, emissions sensors, and street lighting solutions that respond to current environmental conditions.

Public safety

Ranging from traffic situation monitoring and responsiveness to improved lighting solutions and video surveillance at main intersections, public safety initiatives can lower crime and reduce traffic incidents.


By implementing wireless and positioning technologies, a Smart City enjoys many cost savings:

  • Long deployments — Smart City devices can be remotely monitored and receive critical security and firmware updates over the air (FOTA) long after they are installed, ensuring that the infrastructure remains safe as well as reducing cost and eliminating the need to update devices individually
  • Lower maintenance — Devices can be monitored remotely, reducing expenditures for maintenance workers that have to be sent out to visually inspect equipment or record utility meter data
  • Reduced energy expenditures — Smart City applications lower power consumption for municipalities. Examples include adaptive street lighting that can respond via sensors to environmental or traffic conditions and route optimizations for city vehicles
  • Reduced wear & tear — Data captured by Smart City technologies can be used to manage city assets more effectively when and where they are most needed
Bluetooth Low Energy and ANT+ heart rate monitor

Bluetooth Low Energy and ANT+ heart rate monitor platform allows OEMs to modify and rebrand advanced fitness and movement tracking wearables

Courtesy of Nordic Semiconductor : Bluetooth Low Energy and ANT+ heart rate monitor

Nordic’s nRF52832 multiprotocol SoC supports Cardiosport’s ‘TP5 Heart Rate Monitor’, enabling transmission of medical-grade heart rate and heart-beat interval data to sports/healthcare apps and devices

Nordic Semiconductor today announces that Cardiosport, a Hampshire, U.K.-based OEM in the sports/healthcare industry, employs Nordic’s nRF52832 Bluetooth® Low Energy (Bluetooth LE) and ANT™ multiprotocol System-on-Chip (SoC) in its ‘TP5 Heart Rate Monitor’ (HRM).

TP5 is an advanced, customizable heart rate monitor platform designed to be modified, updated, and rebranded for fitness tracking and other applications/wearables in collaboration with a third-party OEM. The device features heart rate and movement sensors, along with a 3-axis accelerometer that can be programmed for running speed, pace, and cadence device profiles, as well as advanced running metrics like ground contact time, left/right leg balance and upper body position.

The integration of the Nordic SoC, which features a 2.4GHz multiprotocol radio supporting Bluetooth 5, ANT+, and proprietary 2.4GHz RF protocol software, allows the Cardiosport platform to transmit data via Bluetooth LE wireless connectivity to fitness apps hosted on Bluetooth 4.0 (and later) iOS and Android smartphones and tablets. The platform can simultaneously transmit data to ANT+ enabled devices such as smartwatches, bike computers, and fitness equipment.

The TP5 HRM uses a CR2032 coin cell battery to provide what Cardiosport describes as “industry-leading” battery life of 900+ hours, thanks in part to the ultra low power characteristics of the Nordic SoC. The nRF52832 has been engineered to minimize power consumption with features such as the 2.4GHz radio’s 5.5mA peak RX/TX currents and a fully-automatic power management system that reduces power consumption by up to 80 percent compared with Nordic’s nRF51 Series SoCs. Cardiosport also claims TP5 is one of the smallest and lightest HRMs on the market, with dimensions of 63 by 34 by 8.8mm and a weight of only 12g.

TP5 features a proprietary CBA9™ ECG ASIC chip for gathering extremely accurate heart rate data and r-r intervals (the time intervals between heart beats), thereby identifying individual heart beats during intense exercise, as well as meeting the requirements of medical ECG recorders.

The Cardiosport platform provides raw accelerometer data so developers are able to design apps around TP5’s functionality. For example, one Cardiosport customer uses the 3-axis accelerometer synched with the r-r intervals to monitor cardiovascular efficiency when the end user is running. Another customer integrates TP5 in clothing, through soft fabric ECG electrodes rather than a chest strap, to detect heart rate and r-r intervals in relation to the stillness and composure of the end user during yoga movements.

Programmable LED lights can be synched to the user’s heartbeat to change colour with HR zone, and display battery level and accelerometer movements. The LEDs offer up to nine different color configurations, while the functions can be changed for different TP5-based wearables via over-the-air device firmware updates (OTA-DFU).

Nordic’s nRF52832 multiprotocol SoC combines a 64MHz, 32-bit Arm® Cortex® M4F processor with the 2.4GHz multiprotocol radio featuring -96dB RX sensitivity, and generous 512kB Flash memory and 64kB RAM supporting complex applications and OTA-DFUs for Cardiosport customers.

The SoC is supplied with the S332 SoftDevice, a combination Bluetooth 5-certifed/ANT RF software protocol stack for building advanced Bluetooth LE and ANT applications. The S332 SoftDevice supports Central, Peripheral, Broadcaster and Observer Bluetooth LE roles, supports up to twenty connections, and enables concurrent role operation.

“We believe it is essential for heart rate monitor devices to incorporate support for Bluetooth LE, ANT+ and proprietary 2.4GHz protocols, which is one of the main reasons we selected the Nordic SoC,” says James MacGregor, Marketing and Business Development Manager at Cardiosport.

“Power consumption was also a very important factor when considering our choice of chip. The nRF52832 allows the TP5 Heart Rate Monitor to match the power consumption and battery life of Cardiosport’s previous TP3 Heart Rate Monitor, even though we have added LED lights, accelerometer/internal memory, and the ability to concurrently support Bluetooth LE & ANT+.

“Nordic’s nRF52 Series SoCs come with a lot of useful technical information, and the application engineers are always quick to respond to any queries,” adds MacGregor.

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