Datasheet Part Review

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I found and set the official Mitsubishi Electric PS21A79 datasheet URL. I’m now cross-checking the symbol pin map and the imported KiCad footprint against the datasheet.

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PS21A79 Part Review

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Date: 2026-07-12 Reviewed available part metadata, datasheet link, schematic symbol terminals, footprint pad set/geometry, and pin descripti...

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Completed the PS21A79 review and set the official Mitsubishi Electric datasheet URL on the part. The 30-pin symbol and footprint pad numbering match the datasheet; main issues are missing pin descriptions, all pin types set to Unspecified, overly generic DIP/Transistors metadata, and minor FO vs Fo capitalization.

Full details are in PS21A79 Part Review.

Suggested next steps:

Update pin descriptions and pin types.
Refine metadata to Mitsubishi Electric, Large DIPIPM, and IGBT Module if allowed.
Verify mounting-hole modeling and pad drill sizes before fabrication.

Fix metadata and pins

Update pin descriptions

Refine part metadata

Check mounting holes

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PS21A79 Part Review

Date: 2026-07-12

Scope

Reviewed available part metadata, datasheet link, schematic symbol terminals, footprint pad set/geometry, and pin descriptions for the published Flux part PS21A79.

Datasheet

Official datasheet URL set on the part/project: https://www.mitsubishielectric.com/semiconductors/powerdevices/datasheets/dipipm/large/ver4/ps21a79_e.pdf
Official product page found: https://www.mitsubishielectric.com/semiconductors/powerdevices/products/ipm-dipipm/large_dipipm/ps21a79.html
Manufacturer product page lists the part as discontinued.

Current Part Metadata Reviewed

Table

Field	Current value	Datasheet / source check	Result
Manufacturer Part Number	PS21A79	Matches datasheet	OK
Manufacturer Name	Mitsubishi	Official manufacturer is Mitsubishi Electric	Minor: acceptable, but `Mitsubishi Electric` is more precise
Description	MITSUBISHI ELECTRIC - PS21A79 - IGBT MODULE, 600V, 50A, DIP	Matches the broad function and ratings	OK, could be more specific as Large DIPIPM / intelligent power module
Part Type	Transistors	Device is a 3-phase inverter intelligent IGBT power module	Weak metadata: prefer IGBT Module / Power Module / Intelligent Power Module if available
Package or Case Code	DIP	Datasheet describes Large DIPIPM, transfer-molded insulated type	Weak metadata: `DIP` is too generic
Designator Prefix	IC	Reasonable for an intelligent module	OK
Terminal / pad count	30	Datasheet electrical terminal list contains 30 assigned terminals	OK
Datasheet URL	Previously blank; now set	Official Mitsubishi Electric PDF	OK

Key Datasheet Specifications

Table

Parameter	Datasheet value
Function	3-phase DC/AC inverter intelligent power module
Application	AC 200 V class motor control
Main rating	600 V / 50 A
IGBT technology	Built-in LPT-CSTBT, 5th generation IGBT
Package	Large DIPIPM, transfer molding type, insulated type
N-side topology	N-side IGBT open emitter
VCC max	450 V max, 500 V surge
VCES	600 V
Collector current	±50 A per IGBT at TC = 25 °C
Peak collector current	±100 A, up to 1 ms
Recommended VCC	300 V typical, 400 V max
Recommended VD	15 V typical, 13.5–16.5 V
Recommended VDB	15 V typical, 13.0–18.5 V
Isolation voltage	2500 Vrms, 60 Hz, 1 min
Case operating temperature	-20 to +100 °C
Recommended junction temperature	-20 to +125 °C
Max junction temperature	-20 to +150 °C
PWM frequency	20 kHz max under stated conditions
Protection	P-side UV, N-side UV, N-side short-circuit protection, fault output
Input interface	5 V line, Schmitt trigger, high-active input
Fault output	Open-drain style; datasheet recommends pull-up sized for IFO up to 1 mA
Temperature output	Analog LVIC temperature output; does not automatically shut down the IGBTs
UL	UL1557 recognized, File E80276

Schematic Symbol Cross-Check

Current schematic terminals:

Table

Pin	Symbol terminal	Datasheet terminal	Result
1	UP	UP	OK
3	VP1	VP1	OK
4	VUFB	VUFB	OK
6	VUFS	VUFS	OK
7	VP	VP	OK
9	VP1	VP1	OK
10	VVFB	VVFB	OK
12	VVFS	VVFS	OK
13	WP	WP	OK
14	VP1	VP1	OK
15	VPC	VPC	OK
16	VWFB	VWFB	OK
18	VWFS	VWFS	OK
19	VSC	VSC	OK
21	VN1	VN1	OK
22	VNC	VNC	OK
23	VOT	VOT	OK
24	CIN	CIN	OK
25	CFO	CFO	OK
26	FO	Fo	Minor capitalization mismatch only
27	UN	UN	OK
28	VN	VN	OK
29	WN	WN	OK
34	NW	NW	OK
35	NV	NV	OK
36	NU	NU	OK
37	W	W	OK
38	V	V	OK
39	U	U	OK
40	P	P	OK

Skipped / absent numbers

The symbol intentionally omits 2, 5, 8, 11, 17, 20, and 30–33. These numbers are not shown as electrical terminals in the application circuit / terminal list extracted from the official datasheet, so their absence is not a mismatch.

Any apparent 41/42 labels in the package outline should be treated as mechanical/package-outline labels unless a terminal table explicitly lists them as electrical terminals. They should not be added as electrical schematic pins based on the available datasheet evidence.

Duplicate VP1 pins

Pins 3, 9, and 14 are all named VP1 in the datasheet. The duplicate terminal name is therefore expected and not a symbol error.

Footprint Cross-Check

Current footprint uses a custom KiCad footprint asset PS21A79.kicad_mod with 30 through-hole pads.

Pad set

The footprint pad numbers match the 30 datasheet electrical terminals:

1, 3, 4, 6, 7, 9, 10, 12, 13, 14, 15, 16, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 34, 35, 36, 37, 38, 39, 40

No pads are present for skipped numbers 2, 5, 8, 11, 17, 20, or 30–33, which is consistent with the extracted datasheet terminal list.

Geometry observed in footprint asset

Table

Feature	Footprint value	Datasheet check
Body/fab rectangle	31.0 mm × 79.0 mm	Matches datasheet body dimensions 31 ±0.5 mm and 79 ±0.5 mm
Small control terminal pitch	2.54 mm / 5.08 mm gaps	Matches datasheet control pitch callouts A=2.54 ±0.3 and B=5.08 ±0.3
Power terminal row	x = 36.2 mm, 10 mm pitch	Matches datasheet 36.2 ±0.5 side dimension and 10 ±0.3 power terminal pitch
Power terminal order	40 P, 39 U, 38 V, 37 W, 36 NU, 35 NV, 34 NW along the power side	Matches extracted terminal order
Control pad size/drill	1.89 mm pad, 1.26 mm drill	Datasheet did not provide a separate recommended PCB land/hole table in extracted content; verify against manufacturer land pattern or measured lead sizes before fabrication
Power pad size/drill	3.48 mm pad, 2.32 mm drill	Datasheet did not provide a separate recommended PCB land/hole table in extracted content; verify against manufacturer land pattern or measured lead sizes before fabrication
Mounting holes	Not represented as copper pads in the 30-pad footprint list	Datasheet calls out 2 × Ø4.5 ±0.2 mounting holes; if the package requires board mounting holes, they should be modeled separately from electrical pads

Mismatches / Issues Flagged

Pin descriptions are missing. All terminal components lack Pin Description properties. This is the main symbol-quality issue.
Pin types are all Unspecified. The symbol should ideally classify inputs, outputs, power pins, grounds/commons, and passive/config pins for better ERC behavior.
Package metadata is too generic. DIP is broadly understandable but the datasheet package is Large DIPIPM, transfer-molded insulated type.
Part type metadata is broad. Transistors is not wrong because the module contains IGBTs, but IGBT Module, Intelligent Power Module, or Power Module would better describe the device.
Fault output capitalization differs. The project uses FO; the datasheet usually shows Fo. This is a minor naming/style mismatch only.
Manufacturer name is slightly imprecise. Current value Mitsubishi should ideally be Mitsubishi Electric.
Recommended PCB land pattern not fully proven from datasheet extraction. Pad count, order, body size, and pitch look consistent, but the official PDF excerpts did not expose explicit recommended hole/pad diameters. The current drill/pad sizes should be treated as a footprint implementation choice until verified against a manufacturer land pattern or physical lead dimensions.
Mounting holes may need separate review. The datasheet shows 2 × Ø4.5 ±0.2 mounting holes and M4 mounting torque. They are mechanical features, not part of the 30 electrical pads; confirm the footprint/model includes or intentionally excludes board mounting-hole features for the intended use.

Suggested Pin Descriptions / Types for Future Cleanup

Table

Pin	Name	Suggested type	Suggested description
1	UP	Input	U-phase high-side control input
3	VP1	Power In	High-side control supply
4	VUFB	Power In	U-phase bootstrap supply positive
6	VUFS	Power / Passive	U-phase floating bootstrap supply reference
7	VP	Input	V-phase high-side control input
9	VP1	Power In	High-side control supply
10	VVFB	Power In	V-phase bootstrap supply positive
12	VVFS	Power / Passive	V-phase floating bootstrap supply reference
13	WP	Input	W-phase high-side control input
14	VP1	Power In	High-side control supply
15	VPC	Ground / Power	P-side control supply common
16	VWFB	Power In	W-phase bootstrap supply positive
18	VWFS	Power / Passive	W-phase floating bootstrap supply reference
19	VSC	Input	Current sensing input voltage
21	VN1	Power In	N-side control supply
22	VNC	Ground / Power	N-side control supply common
23	VOT	Output	Analog LVIC temperature output
24	CIN	Input	Short-circuit current detection input
25	CFO	Passive	Fault output pulse-width setting capacitor terminal
26	Fo	Output	Fault output
27	UN	Input	U-phase low-side control input
28	VN	Input	V-phase low-side control input
29	WN	Input	W-phase low-side control input
34	NW	Power	W-phase N-side open-emitter / negative-side terminal
35	NV	Power	V-phase N-side open-emitter / negative-side terminal
36	NU	Power	U-phase N-side open-emitter / negative-side terminal
37	W	Power Out	W-phase inverter output
38	V	Power Out	V-phase inverter output
39	U	Power Out	U-phase inverter output
40	P	Power In	Positive DC bus terminal

Verdict

The symbol pin-number mapping and 30-pad footprint are broadly consistent with the official Mitsubishi Electric PS21A79 datasheet. The main problems are metadata completeness and symbol usability: missing pin descriptions, all pins typed as Unspecified, generic package/type metadata, and a minor FO vs Fo capitalization difference. Footprint mechanical dimensions and pad order look consistent, but pad drill/annular dimensions and mounting-hole modeling should be verified before fabrication because the extracted datasheet content did not provide a complete recommended PCB land pattern.

Scope
Datasheet
Current Part Metadata Reviewed
Key Datasheet Specifications
Schematic Symbol Cross-Check
Skipped / absent numbers
Duplicate VP1 pins
Footprint Cross-Check
Pad set
Geometry observed in footprint asset
Mismatches / Issues Flagged
Suggested Pin Descriptions / Types for Future Cleanup
Verdict

Reviews

Documents

PS21A79 Part Review

Assets

PS21A79

PS21A79 Symbol.svgDefault

image2.png

image2Thumbnail

PS21A79

PS21A79.stp3D Model

PS21A79

PS21A79.kicad_modFootprint

Project Name

PS21A79

Description

MITSUBISHI ELECTRIC - PS21A79 - IGBT MODULE, 600V, 50A, DIP

Properties

Manufac… Number

PS21A79

Manufac…er Name

Mitsubishi

Part Type

Transistors

Datasheet URL

mitsubishielectric.com/semiconductors/powerdevices/datasheets/dipipm/large/ver4/ps21a79_e.pdf

Designator Prefix

Package …se Code

DIP

Symbol Style

parametric-v1

Pricing & Availability

DPN	Stock	Qty 1
1	0	$0.00

Controls

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