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Understand the electrical specs, physical format, and real-world uses of the CHR0603-1% 1MOhm resistor. Sourcing tips for South Africa included.
Explore size, rating, tolerance, and electrical properties of the CHR0603-1% 1MOhm chip resistor.
Tips for using this resistor in signal conditioning, pull-ups, and measurement circuits.
Advice on local stock, lead times, and compatible alternatives at Communica.
The CHR0603-1% 1MOhm resistor is a surface-mount chip resistor offering a nominal value of 1 megaohm (1,000,000 Ohm) with 1% precision, housed in an industry-standard 0603 (metric 1608) SMD package. Designed for signal conditioning, pull-ups, biasing, and measurement circuits, these resistors are commonly used by engineers, technicians, and students across South Africa for both prototyping and production.
The CHR barcode prefix typically references a popular Asian-manufactured thick-film series available in local distribution. This 1MOhm 1% variant balances compact size, stable precision, and widespread compatibility with automated assembly processes.
| Parameter | Value | Notes |
|---|---|---|
| Resistance Value (R) | 1 MOhm (1,000,000 Ohm) | High-value-commonly used for leakage, pull-up, and bias circuits. |
| Tolerance | 1% | Indicates predictable, repeatable results. |
| Package Size | 0603 (Imperial) / 1608 (Metric) | 1.6 x 0.8 mm - ideal for dense PCBs. |
| Power Rating | Typically 0.1W (100mW) | Subject to derating with temperature. |
| Working Voltage | ~50V | Check datasheet for max continuous voltage. |
| Temperature Coefficient | 100 ppm/ degreesC typical | Suitability for precision measurement. |
The 0603 package is favoured for high-density surface-mount layouts in consumer, industrial, and education projects in South Africa. Markings often are omitted due to the small size-PCB documentation is essential.
Suppose you use a CHR0603-1% 1MOhm resistor for a pull-up on a digital line. If 5V appears across the resistor:
| Parameter | Value |
|---|---|
| Current (I = V/R) | 5V / 1,000,000Ohm = 5uA |
| Power Dissipated (P = V x I) | 5V x 5uA = 25uW |
This application is well within the 0.1W rating, ensuring safe, reliable operation even in typical South African ambient conditions. For voltages near the 50V limit of the part, recalculate to ensure the resistor doesn't exceed 100mW dissipation.
Communica stocks a wide array of chip resistors, including the CHR series and equivalents from leading brands. Both bulk reels for assembly and small packs for prototyping/education are generally available. Lead times for the most popular SMD sizes are short (1-3 days for local stock at Samrand); longer for less common values or bulk orders.
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