This document describes the features and characteristics of the Holco range of Precision Metal Film Resistors, including ultra precision, matched sets available to 2ppm/°C, high pulse withstand, low reactance, low TCR, long term stability, etc.
The HOLCO series from Tyco Electronics offers ultra‑precision metal‑film resistors for industrial and military applications. The resistors are produced by sputter‑coating metal alloy films onto ceramic substrates and applying a laser‑spiralled epoxy coating for high stability and environmental protection.
Key features include tolerances from 0.05 % to 1 %, low temperature coefficients down to 5 ppm/°C, and power ratings up to 1 W. Detailed electrical characteristics, dimensions, and ordering codes are listed for the HAP, H4, and H8 styles.
| Power Rating at 70°C | 0.25W (HAP), 0.063W (H4), 0.125W (H8) |
|---|---|
| Temperature Rise (max) | 32°C (HAP), 14°C (H4), 28°C (H8) |
| Limiting Element Voltage | 250 V (HAP), 200 V (H4, H8) |
| Low TCR | Down to 5 ppm/°C |
| Tolerance Options | 0.1 %, 0.25 %, 0.5 %, 1 % |
| Body Length (L) maximum | 10.0 mm (H4, H8), 7.20 mm (H8) |
| Body Diameter (D) maximum | 3.70 mm (H4, H8), 2.50 mm (H8) |
| Lead Diameter (d) maximum | 0.60 mm |
| Recommended Mounting Pitch | 12.7 mm (H4, H8), 10.2 mm (H8) |
| Weight (g/100 resistors) | 40 g (H4, H8), 24 g (H8 commercial) |
The HAP style is rated at 0.25 W, the H4 style at 0.063 W, and the H8 style at 0.125 W.
Resistors are offered with tolerances of 0.1 %, 0.25 %, 0.5 % and 1 %.
The series offers a low temperature coefficient down to 5 ppm/°C.