Chassis Mount Resistors
Chassis mount resistors are power resistors designed to be bolted directly onto a metal surface, usually a heatsink or the equipment chassis itself, so heat can escape efficiently. You'll see them in wirewound, thick film, and aluminum-housed versions, with power ratings from around 10 watts up to several hundred. Common uses include dynamic braking for motor drives, load banks, power supplies, snubber circuits, and precharge or discharge roles in inverters and servo systems. When buyers source these parts, they usually care less about the datasheet front page and more about practical details. Tolerance and temperature coefficient matter for precision applications, but the real headaches come from pulse handling, mounting hardware, and whether the part actually matches the footprint in your BOM. One trade-off we see often is price versus lead time. Cheaper aluminum-housed types from Asian factories can save real money at volume, but if you need a Vishay, Ohmite, or Caddock equivalent with proper traceability, expect to pay more and sometimes wait longer for allocation stock. Counterfeit risk is also real in this category, especially for popular Ohmite and Arcol part numbers that get re-marked or pulled from scrapped assemblies. Some engineers prefer predrilled mounting holes and captive hardware to speed up assembly; others want the flexibility to mount with their own bolts and thermal grease. Neither is wrong, but it's worth confirming the exact mechanical package before you commit to a reel or tray quantity. We list chassis mount resistors from multiple manufacturers at icxing.com. You can check current stock, compare lead times, and request a quote directly on the site.
Frequently Asked Questions
How do I know if a chassis mount resistor is genuine and not a re-marked or pulled part?
Start with the packaging and labels. Genuine parts usually come in manufacturer trays or boxes with lot codes that match the label. If the price is suspiciously low or the markings look slightly off, ask for traceability documentation or a certificate of conformance. We source only through vetted channels and can provide photos or lot details on request.
What tolerance and temperature coefficient should I specify for a braking resistor application?
For dynamic braking, 5% tolerance and a TCR of ±100 ppm/°C are usually fine because the resistor is just dumping energy. Precision is less critical than pulse capability and thermal stability. If you are using it in a feedback or sensing role, you may need 1% or better and a lower TCR, but expect longer lead times and higher cost.
How long does it typically take to get chassis mount resistors if the factory has no stock?
Standard lead times for common values from Vishay or Ohmite run 8 to 12 weeks if the line is not allocated. Aluminum-housed parts from Asian sources can sometimes be faster, 4 to 6 weeks, but minimum order quantities may apply. We often have franchise and non-franchise stock at icxing.com, so it's worth checking live inventory before you plan around a long factory lead.
| Image | Part | Manufacturer | Description | Stock | Action | |
|---|---|---|---|---|---|---|
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Honeywell Sensing and Productivity Solutions | RES CHAS MNT 6 OHM... |
43,000
In-stock
|
Inquiry |