AR05FTBW0500
Viking Tech
Needs validationmedium risk
A pin-compatible alternative with superior TCR, but different technology.
Best Alternatives to RS-05K49R9FT
Find alternatives for the RS-05K49R9FT, a 49.9Ω 1% 125mW 0805 thick film resistor. This page lists potential upgrades and parametric alternatives for your application.
AI replacement insight
Electrical risklow
Most candidates are upgrades. Resistance/power differences must be checked.
Package risklow
All candidates share the same 0805 package.
Can it be replaced directly?
Direct replacement for RS-05K49R9FT should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Upgrade to a thin film resistor like PTFR0805B49R9N9 for better precision, or use AR05FTBW0500 for a closer parametric match, noting the technology difference.
Main risk
Technology Mismatch
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | RS-05K49R9FT | AR05FTBW0500 | ARG05BTC49R9 | PTFR0805B49R9N9 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 0805 | 0805 | 0805 | 0805 | 0805 — Same package size.; ARG05BTC49R9: Same package size.; PTFR0805B49R9N9: Same package size.; RS-05K51R0FT: Same package size. |
| Resistance | 49.9Ω | 50.0Ω | 49.9Ω | 49.9Ω | 50.0Ω / 49.9Ω / 51.0Ω — 0.2% resistance difference, within target's 1% tolerance.; ARG05BTC49R9: Resistance matches.; PTFR0805B49R9N9: Resistance matches.; RS-05K51R0FT: 2.2% higher resistance. Next standard value. |
| Power | 0.125W | 0.125W | 0.125W | 0.13W | 0.125W / 0.13W — Identical power rating.; ARG05BTC49R9: Identical power rating.; PTFR0805B49R9N9: Slightly higher power rating.; RS-05K51R0FT: Identical power rating. |
| Tolerance | ±1.0% | ±1.0% | ±0.1% | ±0.1% | ±1.0% / ±0.1% — Identical tolerance.; ARG05BTC49R9: Tighter tolerance provides higher precision.; PTFR0805B49R9N9: Tighter tolerance provides higher precision.; RS-05K51R0FT: Identical tolerance. |
| Tcr | ±100ppm/℃ | ±10ppm/℃ | ±25ppm/℃ | ±10ppm/℃ | ±10ppm/℃ / ±25ppm/℃ — Superior temperature stability.; ARG05BTC49R9: Superior temperature stability.; PTFR0805B49R9N9: Superior temperature stability. |
| Technology | Thick Film | Thin Film | Thin Film | Thin Film | Thin Film / Thick Film — Different resistor technology.; ARG05BTC49R9: Different resistor technology.; PTFR0805B49R9N9: Different resistor technology; may affect noise/pulse performance.; RS-05K51R0FT: Identical technology. |
Application & sourcing insights
Questions & answers
Verified drop-in options for RS-05K49R9FT are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.