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Explore the CFR100J-1M2 metal film resistor: technical specs, selection tips, calculation examples, and troubleshooting for South African projects. Discover local brands and stock at Communica.
Learn about value, power rating, and uses for 1.2MOhm resistors.
Compare lead times, brands, and suitability for student or industry builds.
See examples in biasing, filtering, and current limiting circuits.
The CFR100J-1M2 is a type of carbon film resistor with a resistance value of 1.2 megaohms (1,200,000 ohms). This component is a common choice for both hobby and professional electronics builds, widely used in South African educational labs as well as production-level circuits. Its high resistance makes it suitable for signal biasing, high-impedance input protection, and low-leakage filtering applications.
| Parameter | Specification |
|---|---|
| Resistance Value | 1.2MOhm (1,200,000 Ohm) |
| Power Rating | 1W (at 70 degreesC) |
| Tolerance | 5% (J) |
| Type | Carbon Film (CFR) |
| Package | Axial, leaded |
| Max Working Voltage | 350V (typical) |
CFR100J indicates a carbon film resistor with a 1 watt rating ("100" refers to 1.0 watt and "J" for 5% tolerance). The "1M2" denotes the resistance value: 1.2 megaohms. The axial through-hole package makes breadboard prototyping and PCB assembly straightforward.
In student labs across South Africa, CFR100J-1M2 resistors are commonly used for building test/demo circuits where input leakage needs to be minimized or where only small currents must flow.
A typical use is biasing the base of a transistor where a small leakage path is needed. For example, in a simple NPN signal amplifier:
+5V ----[CFR100J-1M2]-----|< (B)--- NPN----[Load]---0VThis high value ensures minimal current draw and helps keep the circuit in the intended state with negligible base current leakage.
Carbon film resistors offer a stable, cost-effective option for most general-purpose uses. Their noise is low enough for typical signal-level tasks, and the 1W power rating ensures robust handling of occasional surges. Tolerance of 5% suffices in most analog and digital applications not requiring precision metering.
At Communica, local availability of CFR100J-1M2 resistors from respected brands like Royal Ohm and Uniohm means lead times are typically within 1-2 days for main branches. Large packs and VAT invoices are available for schools, universities, and business procurement orders.
Suppose you use a CFR100J-1M2 as a pull-down in a 150V circuit. Estimate the power dissipated:
| Calculation | Result |
|---|---|
| P = V2 / R = 1502 / 1,200,000 | 0.0188 W (well below 1W; safe) |
This shows the resistor runs cool in high-voltage, very-low-current settings.
Communica carries CFR100J-1M2 and equivalents from prominent brands, and offers click-and-collect from Samrand, Pretoria, and Cape Town branches. Bulk purchases for educational labs are supported, including supplier VAT documentation. Expect reliable in-country lead times and direct support for local students and engineering teams.
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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