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Selco Intros Custom TPE Thermistor Assemblies
Reno, NV — Using an over-molding process to ensure no chance of mois- ture intrusion in the probe assembly, Selco Products’ custom TPE thermis- tors are well-suited for use in appli- cations with overall operating tem- perature ranges of –40 to +135°C (–40 to +275°F). Made with robust, UL-
certified TPE material, these custom assemblies are useful for harsh moisture environ- ments. The TPE housing material is fused to the TPE lead wire insulation during the over-molding process which creates a moisture- proof seal between the probe housing and the lead wire insulation. Depending on application requirements, these custom thermistor assemblies can have an accu- racy as high as ±0.2°C over 0- 70°C or a tolerance of ±1-10 percent. In specific applications such as NSF or medical, FDA-approved TPE material can be supplied. Custom assemblies are pro-
duced with a probe housing size of 0.25 x 1.13 in. (6.4 x 28.7 mm) and
New Products Diodes Inc. Intros Quasi
www.us-
tech.com Resonant PWM Controller
other dimensions can be provided as required. They are supplied with 22 AWG TPE insulated leads. The lead length can be specified by the cus- tomer and comes in gray, black, white and other colors if necessary. The leads can be supplied with con-
Plano, TX — The AP3301 quasi-reso- nant (QR) PWM controller introduced by Diodes, Inc., enables the implemen- tation of high-performance, cost-effec- tive power supplies that are capable of meeting DOE6/COC Tier 2 efficiency requirements at all load levels. Targeting the key market of AC- DC adapters for set-top box and gaming console applications, this controller also meets the auxiliary power requirements of ATX/BTX computer motherboards and is suited for use in open-frame switching power supplies. Multiple operating modes
Custom thermistor assembly. nectors, lead stripping, or blunt cut
as desired. Contact: Selco Products, 8780
Technology Way, Reno, NV 89521 % 800-257-3526
E-mail:
sales@selcoproducts.com Web:
www.selcoproducts.com
allow the AP3301 to perform effi- ciently at different load levels. Under low- or no-load conditions, the IC uses a burst mode to mini- mize standby power consumption while operating at a minimum switching frequency of approximate- ly 20 kHz to avoid audible noise. At intermediate loads, a valley-lock QR mode with frequency foldback improves efficiency and EMI per- formance. For heavy loads, or under low line input conditions, the con- troller enters a continuous conduc- tion mode (CCM) at a fixed 62 kHz switching frequency. A built-in fre- quency dithering function helps reduce EMI emission in both CCM
and QR modes. The AP3301 provides compre-
hensive protection features that include: AC-input brown-out protec- tion, cycle-by-cycle current limit, pre- cise output over-voltage protection,
December, 2016
AP3301 QR PWM controller.
internal over-temperature protection, overload protection, and a pin fault protection circuit, which detects float- ing or short connections on key signal pins and disables PWM switching to
protect the power system. Contact: Diodes, Inc., 4949
Hedgcoxe Road, Suite 200, Plano, TX 75024 % 972-987-3900 fax: 972-731-3510 E-mail:
inquiries@diodes.com Web:
www.diodes.com
TT Electronics Launches Zero Ohm Resistor
Perry, OH — TT Electronics has launched a zero ohm resistor designed for making optional connections on PCB assemblies. The LRZ0603 is a compact 6A zero ohm resistor and is available in surface-mount ceramic chip format. The resistor is aimed at design -
ers of a wide range of products, including power supplies, small motor or actuator drive systems and power management products. The zero ohm resistor is used for making optional connecting points on a PCB, allowing a common PCB to be used for multiple product variants, saving on design time and inventory. The
value is close to the ideal zero ohm characteristic with negligible voltage drop, and its low internal thermal impedance minimizes heating in the assembly, improving reliability and reducing field failures. The LRZ0603 uses a copper
material to achieve low residual resistance and low internal thermal impedance. A thick-film copper con- ductive element is screen printed onto a 96 percent alumina substrate, resulting in far higher current rat- ings for a given footprint. Its wrap- around copper terminations have an electroplated nickel barrier and a sol- derable coating, which provides
Zero ohm surface mount resistors.
LRZ0603 can also be used as a crossover to simplify — and reduce the cost of — PCB design by reducing the number of layers needed. The LRZ0603 has a high current
rating of 6A in a 0603 size, reducing the PCB area required for a high cur- rent link. It is AEC-Q200 qualified, providing the assured reliability of an automotive grade component. The resistor’s ultra-low residual resistance
“leach” resistance properties as well as solderability. Chips can withstand immersion
in solder at 260°C (500°F) for 30 sec- onds and are suitable for reflow or
wave soldering processes. Contact: TT Electronics, 3700
Lane Road, Perry, OH 44081 % 440-352-8961
E-mail:
sales@ttelectronicsamericas.com Web:
www.ttelectronics.com
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