Carbon Resistor 120Ω 0.125W Through Hole
The 120 Ω carbon-film through-hole resistor rated at 0.125 W is a compact axial passive component built for general-purpose electronic use. Its carbon resistive element is covered with a flame-retardant protective coating and terminated with axial leads to allow straightforward soldering, mechanical stability, and compatibility with both manual and automated assembly processes. The 1/8-watt class balances small size with modest power dissipation for low-power circuits.
Electrically, the resistor provides a nominal 120 Ω value with common tolerance options (typically 2% or 5%) and a temperature coefficient appropriate for its ohmic band. Maximum working voltage for the family is constrained by the lesser of the series maximum or the √(P·R) rule; for 120 Ω at 0.125 W that practical limit is about 3.87 V, which implies a rated DC current near 32.3 mA. The part is designed to meet standard IEC/JIS test methods for short-time overload, soldering heat, temperature cycling, endurance and damp-heat.
Mechanically it typically uses the CF size 18 axial body (≈3.30 mm long × 1.70 mm dia.) with ~28 mm leads, making it easy to insert into PCBs or to hand-solder. It withstands industrial temperature extremes (−55 °C to +155 °C) and is RoHS/REACH compliant, offering reliable, economical performance for low-power commercial and industrial circuits.
Features:
- General-purpose resistor ideal for commercial and industrial applications.
- Flame-retardant protective coating standard; flameproof versions available (CFF/CFFM).
- Compatible with automatic sequencing / insertion (Panasert options on selected sizes).
- CFM mini variant for size-constrained applications.
- Standard lead finish: copper-plated steel with 100% tin overplate (CF / CFM); tin-on-copper available as CFQ/CFQM.
- RoHS and REACH compliant, lead-free and halogen-free.
Specifications:
| Parameter | Value |
|---|---|
| Series / Type: | CF (Carbon Film axial), size 18 — 0.125 W class. |
| Nominal resistance: | 120 Ω. (customer selected) |
| Available tolerances: | 2% (G) and 5% (J) typical. |
| Power rating: | 0.125 W (1/8 W) @ 70 °C. |
| Temperature coefficient (TCR): | For 10 Ω to 9.99 kΩ band: 0 ~ −400 ppm/°C (applies to 120 Ω). |
| Maximum working voltage (series limit): | 250 V (size 18 family limit). |
| Maximum working voltage (for 120 Ω): | √(P·R) = √(0.125×120) ≈ 3.87 V (the lesser of series limit and √(P·R) rule — see datasheet). |
| Rated current (based on Vr): | ≈ 32.3 mA (3.87 V / 120 Ω). (derived from datasheet formula) |
| Maximum overload voltage: | 500 V (size 18 entry). |
| Dielectric withstanding voltage: | 350 V (size 18 entry). |
| Operating / storage temperature: | −55 °C to +155 °C. |
| Body dimensions (size 18 typical): | Body length ≈ 3.30 ±0.30 mm, body dia ≈ 1.70 ±0.30 mm, lead length ≈ 28.00 ±3.00 mm, lead dia ≈ 0.40 ±0.08 mm. |
| Lead finish / termination: | Copper-plated steel, 100% tin overplate (CF / CFM) — CFQ/CFQM = tin plated on copper wire. |
| Soldering / mounting: | Flow solder preheat ≤110 °C; peak 260 °C within 10 s. Iron soldering: 380 °C, 5 s per terminal. |
| Standards / tests: | Meets JIS C5201-1 / IEC60115 test methods for overload, soldering heat, temp. change, endurance, damp heat. |
Applications:
- USB Data Line Termination.
- CAN-Bus Network Termination.
- Current Limiting for Low-Power LEDs.
- RS-485 Communication Line Termination.
- In-Circuit Serial Programming (ICSP) Damping.
- Audio Line Input/Output Impedance Matching.
- Pull-Up/Pull-Down for Digital Logic Circuits.
- Voltage Division in Low-Current Sensor Circuits.
- Feedback Resistor in Low-Power Op-Amp Circuits.
- General Purpose PCB Prototyping and Repair.
Package Contents:
- 1x Carbon Resistor 120Ω 0.125W Through Hole
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