Product Overview
Ohmite OD102J 1K Ohm Carbon Composition Resistor - 1/4W, 5% Tolerance, Axial Through-Hole
Condition
Unused NOS. Sourced from an electronics distributor consolidating inventory. Photos show the specific unit you will receive - brown composition body with brown, black, red, and gold color bands; leads are straight, untrimmed, and in excellent condition.
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Product Overview
Ohmite OD102J - 1 kOhm, ±5% tolerance, 1/4W axial carbon composition resistor. Through-hole, axial leaded construction. Carbon composition type, suited for surge and high energy applications. Listed as obsolete by major distributors, making NOS stock like this the practical source for repair and restoration work.
Key Features
- Resistance: 1 kOhm (1K)
- Tolerance: ±5%
- Power rating: 0.25W (1/4W)
- Construction: Carbon composition
- Mounting: Axial lead, through-hole
- Color bands confirmed by photo: brown, black, red, gold
- Leads: Straight, untrimmed - ready for breadboard or hand-soldering
Applications
- Replacing a failed carbon composition resistor in vintage audio gear or an older industrial control board - where the original comp type matters for pulse-handling behavior that metal film may not replicate directly
- Prototyping on a breadboard - inserting axial leads into tie points for current limiting, voltage divider, or pull-up/pull-down configurations in microcontroller and logic circuits
- Hand-soldering onto perfboard or a through-hole PCB for a permanent low-power circuit build
- Demonstrating Ohm's Law or voltage division in a lab or classroom - the color-banded body reads clearly and the robust axial leads handle repeated handling
- Makers sourcing through-hole resistors for retro-style builds, kit assembly, or any project where axial form factor is easier to work with than surface-mount
Frequently Asked Questions
Is this a carbon composition resistor or a carbon film resistor?
Carbon composition. The OD102J is part of Ohmite's OD/OF/OA carbon composition series. Carbon film and carbon composition are different constructions with different noise and pulse-handling characteristics - this is the composition type.
What is the power rating, and can I use it in a 5V or 12V circuit?
Power rating is 0.25W (1/4W). Whether that is sufficient depends on the current in your specific circuit. At 5V across a 1K resistor, dissipation is 25mW - well within the 250mW rating. At 12V, dissipation rises to 144mW - still within rating. Verify dissipation for your actual circuit conditions before using.
Is the OD102J still in production?
No. The OD102J is listed as obsolete by DigiKey. NOS stock from distributor inventory is the current source for this exact part.
What does the color code on this resistor read?
Brown, black, red, gold - confirmed by photo. That decodes to 1K Ohm, ±5% tolerance.
A carbon composition resistor from the era when through-hole was the only hole - still the right call when the circuit calls for it and a substitute just will not do. Put it where it belongs.
