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5. Select a Resistor to Drive an LED

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RohitTelkar
RohitTelkar
July 14, 2025
RC1210FR-07459RL
Component
DigiKey Part NoRC1210FR-07459RL-ND
Mfr Part NoRC1210FR-07459RL
ManufacturerYAGEO

RES 459 OHM 1% 1/2W 1210

459 Ohms ±1% 0.5W, 1/2W Chip Resistor 1210 (3225 Metric) Moisture Resistant Thick Film

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EW

Response By EW AI

  • ✅ Resistance: 459Ω (±1%) matches the calculated 470Ω (±5%) requirement. The difference is less than 3%, resulting in a forward current very close to target (≈21.8mA). This is well within LED tolerance and design intent.
  • ✅ Tolerance: ±1% is tighter than the required ±5%, providing even better accuracy and consistency.
  • ✅ Power Rating: 0.5W (1/2W) is well above the minimum 0.33W requirement. Power dissipated is (10V × 0.022A ≈ 0.22W), so this part offers excellent margin for long-term reliability.
  • ✅ Mounting Type: Surface mount (1210/3225 Metric) is correct for the application.
  • ✅ Technology: Thick film, as required.
  • ✅ RoHS Compliance: RoHS3 Compliant – meets environmental requirements.
Summary: All required specifications are met or exceeded. This resistor is well-suited for the 12V red LED indicator circuit.
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