4. Replace Through-Hole with SMD Resistor
1. Reading the Resistor Color Code
The highlighted resistor on the board shows the following color bands:
Band | Color | Value |
|---|---|---|
Band 1 | Brown | 1 |
Band 2 | Black | 0 |
Band 3 (Multiplier) | Orange | ×1,000 |
Band 4 (Tolerance) | Gold | ±5% |
Calculation: 10 × 1,000 = 10,000Ω = 10kΩ, ±5%
This is a standard ¼W through-hole resistor. For the SMD retrofit, we need a resistor that matches these specs:
10kΩ · ±5% or better · ≥0.25W · 1206 package · Thick Film · SMD · −55°C to +125°C · RoHS compliant
2. How to Find It on DigiKey
Go to DigiKey.com → Resistors → Chip Resistor - Surface Mount
Apply these filters in the left panel:
- Resistance → 10 kOhms
- Tolerance → ±5% (±1% is also acceptable — tighter is always fine)
- Power (Watts) → 0.25W (same as 1/4W)
- Composition → Thick Film
- Package / Case → 1206 (3216 Metric)
- Operating Temperature → −55°C to +125°C
- Part Status → Active
3. Key Specifications & What They Mean
Specification | Required | Why |
|---|---|---|
Resistance | 10kΩ | Must match original value exactly. |
Tolerance | ±5% or better | Gold band = ±5%. Tighter is acceptable. |
Power Rating | ≥0.25W | Matches original ¼W rating. |
Type | Thick Film | Standard, cost-effective for general use. |
Package | 1206 | Handles 0.25W; easy to rework. |
Mounting | Surface Mount | SMD retrofit requirement. |
Temp Range | −55°C to +125°C | Standard industrial operating range. |
RoHS | Yes | Compliance required. |
4. Selecting a Safe, Production-Ready Part
The filtered list will show many matching parts. Before you pick one, check: Is the part Active (not obsolete)? Is stock available? Is the manufacturer reputable? Is a datasheet available?
Full checklist: 📄 How to Select a Safe, Production-Ready Component — EWskills Guide
5. Filtered DigiKey Link
👉 View Matching Parts on DigiKey — 10kΩ, 1206, ±5%, Thick Film, 0.25W