Resistors & Potentiometers

Whether you're building a prototype on a breadboard, soldering an SMD PCB, or repairing automotive electronics, having the right resistor or potentiometer on hand is essential. Our Resistors & Potentiometers collection covers the full spectrum of passive components — from ultra-compact 0201 SMD chip resistors and precision metal film through-hole types to robust cement power resistors and adjustable trimmer potentiometers. Every product is sourced for quality and value, so hobbyists, students, and professional engineers alike can stock their workbench with confidence. Browse bulk kits to cover every resistance value you'll ever need, or pick up specialty components like NTC thermistors and airbag decoder resistors for specific applications.

Why Shop Our Resistors & Potentiometers?

Huge Value Range: From 0Ω jumpers to 10MΩ precision resistors, we have every value covered.
Multiple Package Types: SMD (0201, 0402, 0603, 1210), through-hole DIP, and SIP arrays all in one place.
Bulk & Kit Options: Save time and money with multi-value assortment kits containing hundreds or thousands of pieces.
Tight Tolerances: 1% metal film and SMD options ensure accuracy in precision analog and measurement circuits.
Specialty Components: Thermistors, potentiometers, trimmer pots, and automotive-grade resistors for niche applications.

Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What is the difference between a fixed resistor and a potentiometer?

A: A fixed resistor has a set resistance value that does not change, making it ideal for current limiting, voltage dividing, and signal conditioning in circuits. A potentiometer (or "pot") is a variable resistor with an adjustable wiper that lets you dial in a specific resistance value — commonly used for volume controls, brightness adjustment, and circuit calibration. Trimmer potentiometers (trimpots) are a compact, PCB-mounted variety used for one-time or infrequent adjustments.

Q: What does SMD resistor package size mean (e.g., 0402, 0603)?

A: SMD (Surface Mount Device) resistor package sizes refer to the physical dimensions of the component in hundredths of an inch. For example, an 0402 resistor measures approximately 1.0 mm × 0.5 mm, while an 0603 measures roughly 1.6 mm × 0.8 mm. Smaller packages like 0201 are used in high-density PCB designs, whereas larger packages like 1210 can handle more power dissipation. Always check your PCB footprint before selecting a package size.

Q: What wattage resistor do I need for my project?

A: The required wattage depends on the voltage and current in your circuit. Use the formula P = I² × R (or P = V² / R) to calculate power dissipation. For general signal-level circuits, 1/4W (0.25W) metal film resistors are usually sufficient. For power supply circuits or motor control applications, 5W carbon film or 10W cement resistors provide the headroom needed to prevent overheating and component failure.

Q: What is an NTC thermistor and how is it different from a standard resistor?

A: An NTC (Negative Temperature Coefficient) thermistor is a type of resistor whose resistance decreases as temperature increases. Unlike a standard fixed resistor, a thermistor is a temperature-sensitive component used in temperature sensing, measurement, and compensation circuits — for example, in 3D printer heated beds, HVAC systems, and battery management circuits. They are not interchangeable with fixed resistors in most circuit designs.

Q: Are bulk SMD resistor kits suitable for professional PCB assembly?

A: Yes — our SMD resistor kits with 1% tolerance metal film construction meet the accuracy requirements for most professional and commercial PCB designs. Kits like the 10,000 PCS 0402 SMD Resistors 1% Kit are especially popular with electronics engineers and contract assemblers who need a wide range of values readily available without placing multiple component orders.