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5. Select a Resistor to Drive an LED

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CRMA1210AF470RFKEF
Component
DigiKey Part No3579-CRMA1210AF470RFKEFTR-ND
Mfr Part NoCRMA1210AF470RFKEF
ManufacturerVishay Techno

CRMA1210, 3-SIDED, SOLDER COATED

470 Ohms ±1% 0.35W Chip Resistor 1210 (3225 Metric) Automotive AEC-Q200, High Voltage Thick Film

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EW

Response By EW AI

  • Resistance Value: 470 Ω — matches the calculated requirement for 22 mA LED current from 12V (R = (12V - 2V) / 0.022A = 454 Ω; next standard value is 470 Ω).
  • Tolerance: ±1% — tighter than required ±5%, ensuring more consistent current and brightness.
  • Power Rating: 0.35 W — exceeds the minimum required 0.33 W (Power dissipated: (10V * 0.022A) = 0.22 W, so 0.35 W gives a safe margin).
  • Mounting Type: Surface Mount (1210 package) — matches the SMT requirement.
  • Technology: Thick Film — meets requirement ("Thick Film or Thin Film").
  • RoHS Compliance: Yes (ROHS3 Compliant) — matches requirement.

Conclusion: All required specifications are met or exceeded. This resistor is suitable for limiting current to the red LED in your 12V indicator circuit, with an adequate safety margin for power dissipation and enhanced reliability.

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