Archive for July, 2013

7 Questions to Specify the Correct Circuit Breaker

Wednesday, July 17th, 2013

Circuit breaker selection is a multi-step process. It is a best practice for engineers to make a preliminary breaker selection early in the design phase so the device can be accounted for in the mechanical design; detailed breaker specifications will develop as the design proceeds.

Specifying the right breaker at the right point in the design process can lead to a more robust design, avoid redesigns, decrease development costs and add value to the end product.

Here are 7 questions you can ask yourself to help identify the best circuit protection solution for your design.
1. What is the AC or DC voltage requirement?

2. What is the normal operating amperage of the circuit?

3. How many poles are required?

4. What type of terminals are needed?

5. How should the device be mounted?

6. What type of actuation is preferred?

7. What approvals are needed (UL, VDE, CSA, etc.)?

Radial Multi-pin Metallized Polymer Network for DC to DC Converters

Wednesday, July 17th, 2013

The Type CS multi-pin metallized polymer network is
ideal for the low ESR/ESL requirements in DC to DC
converters and switching power supply applications.
This unique, robust, capacitor design offers high ripple
current capability and high capacitance in a small package.
It is available with straight pins on 0.10“ centers
for through-hole mounting or with gull wing leads for
surface mount assembly. Type CS (Capstick) is encapsulated
in a rugged conformal coating and is packaged
in anti-static tubes for easy handling.
Highlights
♦ Rugged conformal coated case meets UL94V-0
♦ Low ESR/ESL
♦ High ripple current
♦ High capacitance in a small package
♦ Non-inductive design
♦ Non-polar
♦ Surface mount or through hole assembly
♦ Multi-pin leads on 0.10“ centers

RNCS Passivated Nichrome Resistors for High Humidity Applications

Wednesday, July 17th, 2013

RALEIGH, NC (July 9, 2013)  Stackpole’s RNCS series of precision resistors has a nichrome element that is passivated to protect it from corrosion due to humidity and moisture. The result is a precision resistor that performs as well as tantalum nitride based resistors at much lower cost. The RNCS can withstand 3000 hours at 85°C / 85% RH and 10% bias as well as 100 hours at 120 degrees C / 100% RH and 2 atm. pressure with minimal resistance shift.
The RNCS is a great choice for a wide variety of precision resistor requirements for end products such as portable test equipment, portable medical devices and monitors, precision power monitoring and control, industrial and commercial motor controls, battery management, communications testing and monitoring, automotive control, and automotive audio applications.
The RNCS is available in sizes from 0402 to 2512, in resistance values ranging from 10 ohm to 1Meg ohm. This series offers tolerances down to 0.1% and TCR’s as low as 15 ppm / C for a limited value range.