Engineering Guide

Wirewound vs Non-Inductive Wirewound Resistors: Which One Do You Need?

For engineers designing high frequency, pulse and high voltage divider circuits — frequency converters, inverters, power supplies.

The Question Every Design Engineer Asks

When a design calls for a wirewound resistor, a common follow-up is: "Should I use a standard wirewound, or a non-inductive one?"

The answer depends mainly on the frequency of your signal and whether inductance can affect your circuit. This guide clears up the difference so you can choose correctly.

What Is Inductance in a Wirewound Resistor?

A standard wirewound resistor is made by winding resistance wire around a core in a spiral (helical) pattern. That spiral acts like a coil — it introduces inductance into the circuit.

At DC or low frequency, this inductance is negligible. But in high frequency, high speed switching or pulse circuits, that inductance can:

Distort the signal
Cause unwanted voltage spikes (induced EMF)
Reduce accuracy in high frequency sampling

Standard Wirewound vs Non-Inductive: Key Differences

	Standard Wirewound	Non-Inductive Wirewound
Construction	Single spiral winding	Bifilar (double) winding — cancels inductance
Inductance	Moderate	Extremely low
Best for	High resistance, high stability, DC/low-freq	High frequency, pulse, fast switching
Signal fidelity	Good at low freq	Excellent at high freq
Application	Voltage divider, DC load	HF circuits, pulse loops, snubber

How to Decide

Choose standard wirewound (e.g. KNP Series) when:

Your circuit operates at DC or low frequency
You need high resistance with excellent stability
Pulse impact resistance is the priority

Choose non-inductive wirewound (e.g. NKNP Series) when:

Your circuit switches fast or operates at high frequency
Inductance would distort or interfere with the signal
You want to suppress induced EMF in pulse loops
You need lower inductance for precise high-frequency sampling

A Quick Example

Imagine a high frequency pulse circuit. With a standard wirewound resistor, the parasitic inductance can create voltage spikes that interfere with your design. Switching to a non-inductive (bifilar wound) resistor eliminates most of that inductance, giving cleaner, more accurate performance — without giving up the power handling of a wirewound resistor.

Get the Right Resistor for Your Circuit

At Dongguan Dinghao Electronics, we manufacture both types:

KNP Series — high resistance wirewound resistors, high stability, pulse resistant
NKNP Series — high resistance non-inductive wirewound resistors, extremely low inductance

Both support custom resistance values and power ratings. Not sure which you need? Tell us your frequency, voltage and circuit type.

Mr. Gong · Tel/WhatsApp +86 139 2944 6882 · www.dgdinghao.com.cn. This is a general engineering reference. Always confirm technical specifications with your supplier before ordering.