The Engineering Design Show, 8 – 9 October 2025, Coventry Building Society Arena, UK, Stand J3
The PD ultra-precision TO-220 through-hole power resistor series from Alpha Electronics offers a power rating of up to 8W on a heat sink or 1.5W in free air (at 25°C) over a wide resistance range of 0.1Ω to 10kΩ. 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 5Ω and 10kΩ as well as tight tolerances down to ±0.02% between 25Ω and 10kΩ.
The PD 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 applications. Their standard TO-220 package is commonly used for power semiconductor devices making them ideal for new power designs.
Pin pitch for the Alpha PD series is 5.08 ±0.5mm.
The below table gives a summary of the specifications and options available for the Alpha PD series:
Weight | 0.00000 kg |
---|---|
Dimensions | 19.00 x 4.50 x 10.60mm |
Maximum Resistance | 10kΩ |
Minimum Resistance | 0.1Ω |
Package / Size | |
Power Rating | |
Product Type | |
Resistance Value | Custom (0.1Ω – 1Ω), Custom (1Ω – 5Ω), Custom (5Ω – 10Ω), Custom (10Ω – 25Ω), Custom (25Ω – 10kΩ) |
Series / Model | |
Temperature Coefficient | |
Temperature Range (°C) | -55 to +155°C |
Tolerance |
SKU | Resistance Value | Temperature Coefficient | Tolerance |
---|---|---|---|
Alpha PDW (0.1Ω - 1Ω) F | Custom (0.1Ω - 1Ω) | ±15 ppm/°C | ±1% |
Alpha PDW (0.1Ω - 1Ω) G | Custom (0.1Ω - 1Ω) | ±15 ppm/°C | ±2% |
Alpha PDW (0.1Ω - 1Ω) J | Custom (0.1Ω - 1Ω) | ±15 ppm/°C | ±5% |
Alpha PDW (10Ω - 25Ω) A | Custom (10Ω - 25Ω) | ±15 ppm/°C | ±0.05% |
Alpha PDY (10Ω - 25Ω) A | Custom (10Ω - 25Ω) | ±2.5 ppm/°C | ±0.05% |
Alpha PDX (10Ω - 25Ω) A | Custom (10Ω - 25Ω) | ±5 ppm/°C | ±0.05% |
Alpha PDW (10Ω - 25Ω) B | Custom (10Ω - 25Ω) | ±15 ppm/°C | ±0.1% |
Alpha PDY (10Ω - 25Ω) B | Custom (10Ω - 25Ω) | ±2.5 ppm/°C | ±0.1% |
Alpha PDX (10Ω - 25Ω) B | Custom (10Ω - 25Ω) | ±5 ppm/°C | ±0.1% |
Alpha PDW (10Ω - 25Ω) D | Custom (10Ω - 25Ω) | ±15 ppm/°C | ±0.5% |
Alpha PDY (10Ω - 25Ω) D | Custom (10Ω - 25Ω) | ±2.5 ppm/°C | ±0.5% |
Alpha PDX (10Ω - 25Ω) D | Custom (10Ω - 25Ω) | ±5 ppm/°C | ±0.5% |
Alpha PDW (10Ω - 25Ω) F | Custom (10Ω - 25Ω) | ±15 ppm/°C | ±1% |
Alpha PDY (10Ω - 25Ω) F | Custom (10Ω - 25Ω) | ±2.5 ppm/°C | ±1% |
Alpha PDX (10Ω - 25Ω) F | Custom (10Ω - 25Ω) | ±5 ppm/°C | ±1% |
Alpha PDW (10Ω - 25Ω) G | Custom (10Ω - 25Ω) | ±15 ppm/°C | ±2% |
Alpha PDY (10Ω - 25Ω) G | Custom (10Ω - 25Ω) | ±2.5 ppm/°C | ±2% |
Alpha PDX (10Ω - 25Ω) G | Custom (10Ω - 25Ω) | ±5 ppm/°C | ±2% |
Alpha PDW (10Ω - 25Ω) J | Custom (10Ω - 25Ω) | ±15 ppm/°C | ±5% |
Alpha PDY (10Ω - 25Ω) J | Custom (10Ω - 25Ω) | ±2.5 ppm/°C | ±5% |
Alpha PDX (10Ω - 25Ω) J | Custom (10Ω - 25Ω) | ±5 ppm/°C | ±5% |
Alpha PDW (1Ω - 5Ω) D | Custom (1Ω - 5Ω) | ±15 ppm/°C | ±0.5% |
Alpha PDX (1Ω - 5Ω) D | Custom (1Ω - 5Ω) | ±5 ppm/°C | ±0.5% |
Alpha PDW (1Ω - 5Ω) F | Custom (1Ω - 5Ω) | ±15 ppm/°C | ±1% |
Alpha PDX (1Ω - 5Ω) F | Custom (1Ω - 5Ω) | ±5 ppm/°C | ±1% |
Alpha PDW (1Ω - 5Ω) G | Custom (1Ω - 5Ω) | ±15 ppm/°C | ±2% |
Alpha PDX (1Ω - 5Ω) G | Custom (1Ω - 5Ω) | ±5 ppm/°C | ±2% |
Alpha PDW (1Ω - 5Ω) J | Custom (1Ω - 5Ω) | ±15 ppm/°C | ±5% |
Alpha PDX (1Ω - 5Ω) J | Custom (1Ω - 5Ω) | ±5 ppm/°C | ±5% |
Alpha PDW (25Ω - 10kΩ) Q | Custom (25Ω - 10kΩ) | ±15 ppm/°C | ±0.02% |
Alpha PDY (25Ω - 10kΩ) Q | Custom (25Ω - 10kΩ) | ±2.5 ppm/°C | ±0.02% |
Alpha PDX (25Ω - 10kΩ) Q | Custom (25Ω - 10kΩ) | ±5 ppm/°C | ±0.02% |
Alpha PDW (25Ω - 10kΩ) A | Custom (25Ω - 10kΩ) | ±15 ppm/°C | ±0.05% |
Alpha PDY (25Ω - 10kΩ) A | Custom (25Ω - 10kΩ) | ±2.5 ppm/°C | ±0.05% |
Alpha PDX (25Ω - 10kΩ) A | Custom (25Ω - 10kΩ) | ±5 ppm/°C | ±0.05% |
Alpha PDW (25Ω - 10kΩ) B | Custom (25Ω - 10kΩ) | ±15 ppm/°C | ±0.1% |
Alpha PDY (25Ω - 10kΩ) B | Custom (25Ω - 10kΩ) | ±2.5 ppm/°C | ±0.1% |
Alpha PDX (25Ω - 10kΩ) B | Custom (25Ω - 10kΩ) | ±5 ppm/°C | ±0.1% |
Alpha PDW (25Ω - 10kΩ) D | Custom (25Ω - 10kΩ) | ±15 ppm/°C | ±0.5% |
Alpha PDY (25Ω - 10kΩ) D | Custom (25Ω - 10kΩ) | ±2.5 ppm/°C | ±0.5% |
Alpha PDX (25Ω - 10kΩ) D | Custom (25Ω - 10kΩ) | ±5 ppm/°C | ±0.5% |
Alpha PDW (25Ω - 10kΩ) F | Custom (25Ω - 10kΩ) | ±15 ppm/°C | ±1% |
Alpha PDY (25Ω - 10kΩ) F | Custom (25Ω - 10kΩ) | ±2.5 ppm/°C | ±1% |
Alpha PDX (25Ω - 10kΩ) F | Custom (25Ω - 10kΩ) | ±5 ppm/°C | ±1% |
Alpha PDW (25Ω - 10kΩ) G | Custom (25Ω - 10kΩ) | ±15 ppm/°C | ±2% |
Alpha PDY (25Ω - 10kΩ) G | Custom (25Ω - 10kΩ) | ±2.5 ppm/°C | ±2% |
Alpha PDX (25Ω - 10kΩ) G | Custom (25Ω - 10kΩ) | ±5 ppm/°C | ±2% |
Alpha PDW (25Ω - 10kΩ) J | Custom (25Ω - 10kΩ) | ±15 ppm/°C | ±5% |
Alpha PDY (25Ω - 10kΩ) J | Custom (25Ω - 10kΩ) | ±2.5 ppm/°C | ±5% |
Alpha PDX (25Ω - 10kΩ) J | Custom (25Ω - 10kΩ) | ±5 ppm/°C | ±5% |
Alpha PDW (5Ω - 10Ω) B | Custom (5Ω - 10Ω) | ±15 ppm/°C | ±0.1% |
Alpha PDY (5Ω - 10Ω) B | Custom (5Ω - 10Ω) | ±2.5 ppm/°C | ±0.1% |
Alpha PDX (5Ω - 10Ω) B | Custom (5Ω - 10Ω) | ±5 ppm/°C | ±0.1% |
Alpha PDW (5Ω - 10Ω) D | Custom (5Ω - 10Ω) | ±15 ppm/°C | ±0.5% |
Alpha PDY (5Ω - 10Ω) D | Custom (5Ω - 10Ω) | ±2.5 ppm/°C | ±0.5% |
Alpha PDX (5Ω - 10Ω) D | Custom (5Ω - 10Ω) | ±5 ppm/°C | ±0.5% |
Alpha PDW (5Ω - 10Ω) F | Custom (5Ω - 10Ω) | ±15 ppm/°C | ±1% |
Alpha PDY (5Ω - 10Ω) F | Custom (5Ω - 10Ω) | ±2.5 ppm/°C | ±1% |
Alpha PDX (5Ω - 10Ω) F | Custom (5Ω - 10Ω) | ±5 ppm/°C | ±1% |
Alpha PDW (5Ω - 10Ω) G | Custom (5Ω - 10Ω) | ±15 ppm/°C | ±2% |
Alpha PDY (5Ω - 10Ω) G | Custom (5Ω - 10Ω) | ±2.5 ppm/°C | ±2% |
Alpha PDX (5Ω - 10Ω) G | Custom (5Ω - 10Ω) | ±5 ppm/°C | ±2% |
Alpha PDW (5Ω - 10Ω) J | Custom (5Ω - 10Ω) | ±15 ppm/°C | ±5% |
Alpha PDY (5Ω - 10Ω) J | Custom (5Ω - 10Ω) | ±2.5 ppm/°C | ±5% |
Alpha PDX (5Ω - 10Ω) J | Custom (5Ω - 10Ω) | ±5 ppm/°C | ±5% |
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