How do you calculate power module first-pass yield?

Divide the modules that passed the first time by the total tested and multiply by 100. With 8 passing out of 250 tested, first-pass yield is 3.2%.

What is a good first-pass yield for power modules?

Mature IGBT and SiC module lines target well above 95% first-pass yield; anything in the low single digits, like the 3.2% here, signals a severe process excursion — a bad solder profile, a wire-bond issue, or a mis-set test limit.

What does the yield gap to target mean?

It is the target minus the actual, in percentage points. Against a 95% target, a 3.2% yield leaves a 91.8-point gap — an unmistakable red flag that the line is not in a shippable state.

Could a very low yield be a test setup error rather than real defects?

Absolutely, and it should be your first check. When yield craters to 3.2%, verify test limits, fixture contact, and calibration before scrapping modules — a mis-set parametric limit can fail good parts wholesale.

First-pass yield vs final yield — what's the difference?

First-pass yield counts only parts that pass without rework; final yield includes reworked parts that later pass. The gap between them is your rework burden, which first-pass yield alone does not show.

How many modules should I test before trusting the yield number?

With only 250 tested, a handful of extra fails swings the percentage noticeably. For a stable read on a high-yield line, base decisions on hundreds to thousands of units, or use control limits rather than a single batch figure.

Power Electronics, Motors & Drives calculator

Power Module First-Pass Yield Calculator

Power Module First-Pass Yield measures the share of IGBT or SiC power modules that pass functional and parametric test the first time, without rework or retest. Quality engineers and process owners on power-module lines track it as the single most sensitive indicator of upstream health — solder voiding, wire-bond quality, gate-oxide integrity, and thermal-interface defects all show up here first. Because power modules are high-value and a scrap event is expensive, even a few points of first-pass yield loss carries real cost. Comparing measured yield against a target makes the gap actionable rather than abstract.

What this calculator does

Calculate first-pass yield for IGBT, MOSFET, SiC, GaN, or diode power modules from passed modules, total tested modules, and the target yield.
Use it when reviewing die attach, wire bond, solder void, substrate attach, partial discharge, thermal cycling, or EOL test performance.
It computes first-pass yield as modules passed first time divided by total tested times 100, and reports the gap in points to your target yield.

Formula used

Power module first-pass yield = power modules passed first time ÷ total power modules tested × 100
Power module yield gap to target = target module yield - power module first-pass yield

Inputs explained

Power modules passed first time:
Total power modules tested:
Target module yield:

How to use the result

Use it at end-of-line or after a critical test gate to trend quality and to quantify the distance to a yield target for a power-module line.
First-pass yield alone does not distinguish a systemic process shift from a sampling artifact — a small tested count, like the 250 here, makes the percentage swing sharply on a handful of fails.

Current U.S. benchmarks

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Common questions

How do you calculate power module first-pass yield? Divide the modules that passed the first time by the total tested and multiply by 100. With 8 passing out of 250 tested, first-pass yield is 3.2%.
What is a good first-pass yield for power modules? Mature IGBT and SiC module lines target well above 95% first-pass yield; anything in the low single digits, like the 3.2% here, signals a severe process excursion — a bad solder profile, a wire-bond issue, or a mis-set test limit.
What does the yield gap to target mean? It is the target minus the actual, in percentage points. Against a 95% target, a 3.2% yield leaves a 91.8-point gap — an unmistakable red flag that the line is not in a shippable state.
Could a very low yield be a test setup error rather than real defects? Absolutely, and it should be your first check. When yield craters to 3.2%, verify test limits, fixture contact, and calibration before scrapping modules — a mis-set parametric limit can fail good parts wholesale.
First-pass yield vs final yield — what's the difference? First-pass yield counts only parts that pass without rework; final yield includes reworked parts that later pass. The gap between them is your rework burden, which first-pass yield alone does not show.

Last reviewed 2026-05-12.