Microwave/RF cable assemblies meet mil/aero qualifications

W. L. Gore & Associates, Inc. (Gore) has announced that the
GORE-FLIGHT Microwave Assemblies and GORE Microwave/RF Assemblies for
military/aerospace applications have passed U.S. Army flight qualifications on
the MH-47 Rotorcraft. Gore provided a complex harness that included more than
100 of its rugged assemblies for the ALQ-211 SIRFC, a critical aircraft
survivability system used by the 160th Special Operations Aviation Regiment
(SOAR).

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Gore also provided a similar microwave/RF solution for Aircraft
Survivability Equipment (ASE) on the MH-60 Rotorcraft that is expected to pass
U.S. Army flight qualifications in the next several months. The company also is
working with the U.S. Army to provide high-speed data interconnects for future
APR-39 D(V) 2 radar warning receivers on the Apache D model.

Gore
offers an extensive portfolio of advanced cables, cable assemblies, and
materials designed specifically for harsh military conditions. Products include
microwave/RF assemblies, high-data-rate cables, high-power delivery cables,
aircraft sealants, and shielding materials.

USB 3.0 cable assemblies feature thumbscrews

MilesTek has introduced a new series of USB 3.0 cable assemblies
with thumbscrews that tackle high vibration and vision applications. Aimed at
military and industrial applications in which cable pull can occur from
excessive vibration, the MUS3A-series cables feature a unique molded
connector that includes two thumbscrews on one end of the assembly and a
standard male USB 3.0 connector on the other end.

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The
cables are manufactured per the mechanical requirements of the USB3 Vision
standard and feature 30-micro-inch gold-plated contacts and throughput of 4.8
Gbits/s. The USB 3.0 cables with thumbscrews are in stock and available
for immediate shipment.

Learn more about MilesTek

Inductor offers high operating temp

Vishay Intertechnology has launched a new series of low-profile,
high-current IHLP inductors that claims to be the industry’s first to meet
the requirements of MIL-STD-981 class S. Designed for high reliability in
space-grade applications, the Vishay Custom Magnetics SGIHLP series of
inductors features a ruggedized package and performs at high operating
temperatures to 180°C.

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The SGIHLP series, featuring a magnetically shielded construction,
are offered in five case sizes and are optimized for DC/DC converters and
high-current noise-suppression filters in satellites and defense systems.

Applications include low-profile, high-current power supplies, and
point-of-load (POL) converters; “flight-ready” solar inverters, high current
filters, and DC/DC converters in distributed power systems.

Key
features include high efficiency with typical direct current resistance (DCR)
from 0.56 mΩ to 240 mΩ, inductance values from 0.22 µH to 100 µH, and rated
currents to 100 A. Handling high transient current spikes without saturation,
the inductors provide excellent inductance and saturation stability over the
operating temperature range, said Vishay. Technical datasheets can be found
at www.vishay.com by entering SGIHLP in the “Part
# / Keyword Search” field.

Resettable TCO protects higher-capacity Li-ion batteries

Touting a lightweight and smaller size, Bourns Inc. has released a
new series of miniature
resettable thermal cutoff (TCO) devices
, claiming breakthrough current capacity in a miniature package.
Building on its Model AA series, the new Model AC parts offer improved features
to protect higher-capacity lithium-ion (Li-ion) battery cells.

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Helping battery pack designers save design space and weight, the
AC series is 0.12 mm thinner and 16% lighter than the existing Model AA
devices. The smaller size coupled with higher capacity also help designers
extend Li-ion cell usage beyond the traditional laptop, tablet, and smartphone
applications to power tools, electric vehicles, e-bikes, and grid storage
applications, said Bourns.

The previous Model AA series offered four trip temperature options
from 72°C to 85°C, which the Model AC extends with a fifth option of 90°C. The
new option can carry up to 20 A at 60°C. This makes it the highest
current-carrying TCO device that Bourns offers. The devices also offer
extremely low impedance/resistance (2 mΩ max.). The series is RoHS-compliant
and halogen-free.

Pricing
for the Model AC72ABD is $0.73 each in quantities of 3,000. For more product
information, please see https://bit.ly/1VjH7ai.

MLCCs deliver high capacitance, low ESR

Combing high capacitance and low equivalent series resistance
(ESR), TDK Corp. has introduced its CA series of vertically-stacked MEGACAP
Type multi-layer ceramic capacitors (MLCCs) with a capacitance range from 20 nF
to 150 µF. The new MLCCs are available with C0G, X7T, X7S, and X7R temperature
characteristics and offer a rated voltage range from 25 V to 1,000 V.

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TDK has adapted its MEGACAP stack design so that the MLCC elements
are stacked side by side to achieve a low profile with increased capacitance.
This vertically stacked design also enables stacks with three or more elements.
The CA series will be available initially with 2x and 3x stacks, with future
expansion with 5x stacks.

Other features include metal lead frames attached to the electrode
ends of the components to protect against board flexure cracks and solder
cracks from thermal shocks. The metal material of the terminal has been
optimized to lower the ESR and achieve a higher ripple current capability, said
TDK.

In addition, the hybrid joints between the metal terminals and the
MLCCs are soldered and clamped to prevent the individual MLCC elements from
falling out of the lead frame at higher reflow temperatures, said the company.

The
new capacitors are suitable for the resonant circuits of wireless and plug-in
charging systems such as for industrial vehicles and robots. They can also be
used in smoothing and decoupling applications in industrial equipment.
Production of the CA series began in April 2018. Automotive-grade products will
be introduced after mid-2018.

High-reliability resistors target compact circuits

TT Electronics has expanded its high-reliability CR and HR series
with two resistor types in the 0603 size. These thick-film chip resistors
target compact circuits in aerospace, military, communications, medical, and
industrial applications.

Both resistor series’ thick-film elements claim a higher surge
tolerance than thin-film, which also improves reliability, said TT Electronics.
The CR0603 resistors are available in values from 1R0 to 10M with tolerance
values down to 0.1%. CECC 40401-008 screened parts are optionally available. Applications
include sub-sea repeaters, mainframe systems, and hi-rel systems.

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The resistors’ optional screened release (CECC) enhances
reliability, reduces field failures, and provides low demonstrated FIT rates
compared to competing commodity products, according to the company. Seven sizes
are available from 0503 up to 2512. The CECC-approved resistors are also
available as shorting links.

The HR0603 resistors are available in values from 10M to 20G with
tolerance values down to 5%. Specific applications include high gain
amplifiers, infra-red and glass break sensors, and smoke, gas, and medical
monitors. The HR series’ high-ohmic-value resistors offer enhanced reliability
and reduced field failures compared to series-connected, multi-chip solutions
and deliver a low voltage coefficient of resistance. Custom designs and sizes
are available.

The solder terminations for both series have a nickel barrier
layer that ensures excellent “leach” resistance properties and solderability,
and they will withstand immersion in solder at 260°C for 30 seconds. Both series
also include gold wire bond or solder terminations. An ambient temperature
range of –55°C to 155°C is specified for both ranges. All relevant marking
information is recorded on the primary package or reel.

Datasheets
can be found at https://bit.ly/2KE3gOd and https://bit.ly/2KKBXBQ.

Quartz crystal shrinks in size

The new 32.768-kHz quartz crystal from Micro Crystal AG is housed
in a footprint that measures 1.6 x 1.0 mm with a maximum thickness of 0.35 mm.
The new tiny geometry enhances the circuitry in applications in which bending
radii are critical and complements the new bendable thin-film batteries
from Renata, said the company. Applications include smart cards,
e-textile, wearables (including activity bands), embedded modules, and health care.

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The
low-frequency CM9V-T1A crystals (1.6 x 1.0 x 0.3 mm) are in high-volume
production ramp-up. The CM8V-T1A (1.6 x 1.0 x 0.3 mm) are in high-volume
production now. For more information, please see https://bit.ly/2FSVJr4.

Thermistor eliminates conduction between leads

Ametherm has extended the capabilities of
its ACCU-Curve series of interchangeable NTC thermistors with the
new ACL-011. The devices feature insulated
tinned-copper leads to ensure the most accurate temperature sensing with no
unintended conduction between leads, said the company. Applications include long-term
stability and reliability for high-accuracy temperature sensing, control, and
compensation in medical, industrial, and automotive applications.

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The thermistors offer interchangeability over a broad temperature
range and eliminate the need to individually calibrate or provide circuit
compensation for part variability, according to the company. As less-expensive
alternatives to RTD probes and thermocouples, the devices deliver the tight
tolerances required for accurate temperature measurement in medical
instrumentation and can be potted in a variety of housings for temperature
compensation circuits in industrial and automotive applications.

Key specs include:

  • Resistance
    at 25°C 50 kΩ ±1% tolerance
  • Dissipation
    constant 3 mW/°C min
  • Operating
    temperature range of –40°C to 125°C
  • Thermal
    time constant 12 s
  • Beta
    (25°C/50°C) = 3,950 K
  • Max.
    power rating 50 mW
  • Insulated
    tinned copper leads

The
ACL-011 is available directly or through distributors such as Digi-Key and
Mouser. Samples and production quantities are available now with lead times of
12 weeks for large orders. Volume pricing starts at $1.37 per piece for U.S.
delivery.

Learn more about Ametherm

µModule regulator is EN55022 B-compliant

Analog Devices’ Power by Linear LTM4653 is a 58-VIN
step-down µModule regulator that can safely operate from unregulated or
fluctuating 24-V to 48-V input supplies in noisy environments. Integrating
input and output filters enable the device to meet the EN55022 Class B EMC
standards, and the low EMI architecture makes it suitable for use in signal
processing applications.

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The
output voltage is adjustable with one resistor from 0.5 V to 94% of VIN,
providing the ability to use one product to generate common system bus voltages
of 3.3 V, 5 V, 12 V, and 24 V. The LTM4653 houses a switching regulator
controller, power switches, inductor, and other supporting components in a 15 x
9 x 5.01-mm BGA package. Only the bulk input and output filter capacitors are
needed to complete the design. The LTM4653 operating temperature range is –40°C
to 125°C.

EZBuck regulator is I2C-controllable – Electronic Products

Alpha and Omega Semiconductor introduced the EZBuck regulator family
with I2C
control. The first two, the 4-A AOZ2231CQI-01 and the 8-A AOZ2233CQI-02,
provide a compact, efficient power converter solution for next-generation
chipsets and FPGAs. Microprocessors and SoCs often use dynamic voltage scaling
to reduce power dissipation and improve system performance, which often
requires several external components. The 4-A AOZ2231CQI-01 and the 8-A
AOZ2233CQI-02 make the design of such converters simple by allowing the system
designer to control the output voltage from 0.6 V to 1.79 V using an I2C interface
with 9.375-mV steps.

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Both the 4-A and the 8-A devices are available in a footprint-compatible QFN 4
x 4-mm package, allowing designers an easy upgrade path as power requirements
increase. The devices accept an input voltage range from 6.5 V to 28 V with a
built-in 5.3-V regulator, making single-supply operation possible. The
proprietary COT architecture provides ultra-fast load transient response performance
and allows stable and low-voltage ripple operation with small ceramic
capacitors. Competing solutions often need to generate a larger output ripple
voltage to stabilize the circuit. Additionally, the input feed-forward feature
provides a constant switching frequency over the entire input voltage range,
further alleviating noise concerns.