Product Overview
KOA CF1/4C472J 4.7k Ohm Carbon Film Axial Resistors, 200-Piece Bulk Bag, Unused NOS
Condition
Unused NOS. Bag label fully legible: CF1/4 52, 4K7 Ohm ±5%, 200PCS, Made in Taiwan R.O.C. Components display Yellow-Violet-Red-Gold color band sequence confirming 4.7k Ohm value. Long tinned axial leads, bulk-packed loose. Sourced from an electronics distributor consolidating inventory.
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Product Overview
KOA CF1/4C472J carbon film axial lead resistors, 200 loose pieces per bag. 4.7k Ohm resistance, 1/4W (0.25W) power rating, ±5% tolerance (J code), standard EIA 4-band configuration. KOA Speer is a well-regarded component manufacturer; the CF series is a workhorse line for general-purpose through-hole work.
Key Features
- Resistance: 4.7k Ohm (4K7)
- Power rating: 1/4W (0.25W)
- Tolerance: ±5% (J code)
- Color code: Yellow-Violet-Red-Gold
- Lead style: Axial, long tinned leads, through-hole
- Flame-retardant coating
- Quantity: 200 pieces per bag
- Manufacturer: KOA Speer Electronics, Made in Taiwan R.O.C.
Applications
- Inserting into a breadboard to limit current to an LED or set a bias point during an Arduino or Raspberry Pi prototype session
- Populating a perfboard or PCB with a common pull-up or pull-down value during a maker build or DIY audio project
- Swapping a burnt or open resistor on a consumer electronics board to bring a radio, amplifier, or TV chassis back to life
- Stocking a workbench parts drawer so the right value is always on hand when a schematic calls for 4.7k in a voltage divider or filter network
- Replacing original carbon film resistors in vintage amplifier or radio restoration where maintaining the original component type matters
Frequently Asked Questions
Are these suitable for audio amplifier repairs?
Yes for most general-purpose positions. Carbon film resistors work well in power supply filtering, bias networks, and non-critical signal paths. For high-gain input stages or precision tone circuits where low noise and tight tolerance matter, metal film resistors are the more common choice.
What is the physical lead spacing and body size?
These are standard 1/4W axial resistors. The long tinned leads fit standard 0.1-inch breadboard and perfboard pitch. Exact body length and lead spacing are not confirmed in the source data, but the form factor is the same as any standard 1/4W axial resistor and fits the same PCB footprints.
Do these work for 5V and 3.3V Arduino and Raspberry Pi circuits?
Yes. At 5V, a 4.7k Ohm resistor passes roughly 1mA, well within the 1/4W rating. At 3.3V the dissipation is lower still. These are a natural fit for LED current limiting, pull-up resistors on I2C lines, and general GPIO protection in low-voltage maker circuits.
Are all 200 pieces the same value?
Yes. The bag label confirms a single value: 4K7 Ohm ±5%, and the Yellow-Violet-Red-Gold band sequence is consistent across the components.
Two hundred of the most-reached-for value on any workbench, from a manufacturer that has been making them right for decades. Stock the drawer, skip the next parts run.
