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South African guide to using CHR1206 surface-mount resistors: specs, sizing, application tips, and troubleshooting-plus advice on local availability and brands at Communica.
Learn key electrical and physical parameters for optimal resistor selection.
Guidelines for footprint sizing, derating, and soldering in South African builds.
Diagnose problems with mounting, thermal limits, and identifying suitable alternatives.
CHR1206 resistors are surface-mount technology (SMT) passive components widely used in modern electronics, from embedded systems and power supplies to hobby PCBs and industrial controllers. The '1206' designator refers to a rectangular package size measuring approximately 3.2mm x 1.6mm. This makes them a balance between current handling, ease of placement, and available board space. For South African makers, students, and engineers, 1206 packages are popular thanks to their compatibility with standard PCB design rules, robustness during hand and reflow soldering, and easy local availability through suppliers like Communica.
When working with CHR1206 resistors, it's important to understand their core specifications. While "CHR" typically denotes a thick-film or chip resistor series, double-check datasheets for confirmation. Here's a summary of the most relevant metrics:
| Parameter | Typical Range / Value | Notes |
|---|---|---|
| Resistance | 1Ohm - 10MOhm | Check actual stocked values |
| Power Rating | 0.25W (250mW) | At 70 degreesC, derate above that |
| Tolerance | 1% or 5% | 1% for precision, 5% for standard |
| Temp. Coefficient | 100ppm/ degreesC - 400ppm/ degreesC | Lower for precision designs |
| Max. Working Voltage | Up to 200V | Verify in datasheet |
Popular brands and series available locally from Communica include Yageo, Vishay, Royal Ohm, and KOA Speer. For critical applications, always validate the full reel or cut-tape origin and check date codes to avoid shelf-life issues.
Selecting a CHR1206 resistor for your project requires balancing several factors:
For each CHR1206 resistor in-circuit, verify that your design stays comfortably below the rated 0.25W power. Use Ohm's Law and the power formula:
| Example Circuit | V (Volts) | R (Ohms) | P (Watts) | Result |
|---|---|---|---|---|
| LED Current Limit | 5 | 220 | 0.114 | Safe for CHR1206 |
| Heater Dropper | 12 | 100 | 1.44 | Exceeds limit — use larger package |
If expected power dissipation approaches 0.20W or above in ambient temperatures above 30 degreesC (common in SA workshops), consider selecting a resistor in a 2512 or 2010 package.
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Review for Communica Samrand Security Wanted to share a heartfelt thank you to the security team at Communica Samrand! Yesterday, I had a personal ex...
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Verified customerNicolene
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I got the most pleasant service from Sydney and Windie
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