1. What is an SMD Resistor Value Calculator?

Definition: This calculator determines the resistance value of surface-mount device (SMD) resistors based on their 3-digit code.

Purpose: It helps electronics engineers, technicians, and hobbyists quickly decode SMD resistor markings.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Resistance value in ohms (Ω)
• \( digit1 \) — First significant digit (0-9)
• \( digit2 \) — Second significant digit (0-9)
• \( multiplier \) — Power of ten multiplier (-2 to 9)

Explanation: The first two digits form the significant figures, while the multiplier determines the magnitude.

3. Importance of SMD Resistor Calculation

Details: Correctly identifying resistor values is crucial for circuit design, troubleshooting, and component replacement.

4. Using the Calculator

Tips: Enter the first two digits (0-9) and the multiplier exponent (-2 to 9). For example, "103" would be digit1=1, digit2=0, multiplier=3 (10 × 10³ = 10kΩ).

5. Frequently Asked Questions (FAQ)

Q1: What does "SMD" stand for?
A: Surface Mount Device - these are compact components designed for automated assembly on PCBs.

Q2: How do I read a 4-digit SMD resistor code?
A: For 4-digit codes, use the first three digits as significant figures and the fourth as the multiplier.

Q3: What about resistors with "R" in their code?
A: "R" represents a decimal point (e.g., "4R7" = 4.7Ω).

Q4: What's the typical range for SMD resistors?
A: Common values range from 0.1Ω (coded as R10) up to several megaohms.

Q5: How accurate are SMD resistors?
A: Accuracy depends on the tolerance code (not shown here), typically 1% or 5%.