Alpha PB Series

The PB ultra-precision through-hole power resistor series from Alpha Electronics offers a power rating of up to 10W on a heat sink using the mounting tabs provided or 2W in free air (at 25°C) with a wide resistance range from 0.4Ω to 50kΩ. By utilising Alpha’s Bulk Metal® foil resistor technology, they are able to offer low temperature coefficients down to ±2.5 ppm/°C between the resistance range 1Ω and 50kΩ as well as tight tolerances down to ±0.01% between 50Ω and 50kΩ.

• Ultra-precision through-hole power resistor
• Each resistor is available in any resistance between 0.4Ω and 50kΩ
• 2-Terminal through-hole case-encapsulated package with heat sink mounting
• Power rating of 10W on a heat sink or 2W in free air at +25°C
• Tight tolerances as low as ±0.01% available between 50Ω and 50kΩ
• Tight TCR available of ±2.5 ppm/°C between 1Ω and 50kΩ
• Maximum working voltage of 750V
• Maximum working current of 5A
• Maximum rated operating temperature +25°C
• Temperature range from -55°C up to +155°C

The PB case-encapsulated, through-hole, ultra-precision power resistor series exhibits excellent high frequency characteristics thanks to Alpha’s Bulk Metal® foil resistor technology, making them suitable for the most demanding precision and high power applications.

Pin pitch for the Alpha PB series is 15.0 ±0.5mm.

The below table gives the full specifications for each resistor model available including the Alpha PB series:

* Symbols parenthesized are for part number composition
✝ Resistance figures for type PB are the values obtained by measuring the leads at point 12.7±3.2mm away from the root, but in case of resistance value below 10Ω, the values at 5.08 ±0.6mm away
** For heat sinking, an aluminium chassis in 152.4 (L) x 101.6 (W) x 50.8 (H) x 1.0mm (T) shall be used