STGD20N40LZ IGBT Equivalent & Substitute Parts

Part Overview

The STGD20N40LZ is an automotive-grade IGBT manufactured by STMicroelectronics, rated for 390 V collector-emitter breakdown voltage and 25 A maximum collector current in a surface mount DPAK package. This device is part of the PowerMESH™ series and maintains Active product status with full AEC-Q101 automotive qualification. Substitute parts are identified to provide alternative sourcing options where inventory availability, lead time, or application-specific performance parameters necessitate component replacement while maintaining electrical and mechanical compatibility.

Substiute Parts

STGD20N40LZ

STMicroelectronicsIn Stock: 1641STGD20N40LZ Datasheet

Current PartRFQ

FGD3040G2-F085

onsemiIn Stock: 7748FGD3040G2-F085 Datasheet

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FGD3440G2-F085

onsemiIn Stock: 3420FGD3440G2-F085 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STGD20N40LZ are qualified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

• Package compatibility: TO-252-3 DPAK surface mount form factor
• Voltage rating: Collector-emitter breakdown voltage equal to or greater than 390 V
• Current rating: Collector current capacity sufficient for application requirements
• Thermal characteristics: Operating temperature range encompassing -55°C to 175°C
• Automotive qualification: AEC-Q101 certification maintained
• Logic input type: Gate drive compatibility with 5 V logic signals
• RoHS3 compliance and MSL Level 1 rating

Identified Substitute Parts:

1. FGD3440G2-F085 (onsemi EcoSPARK® series): 400 V, 26.9 A, TO-252AA package, AEC-Q101 qualified
2. FGD3040G2-F085 (onsemi EcoSPARK® series): 400 V, 41 A, TO-252AA package, AEC-Q101 qualified

Both substitute devices meet or exceed the voltage and current specifications of the main part, maintain identical package geometry, and carry equivalent automotive-grade certifications.

Parameter Comparison

Engineering Selection Recommendations

FGD3440G2-F085 Selection Criteria:

The FGD3440G2-F085 provides direct electrical substitution for applications where collector current requirements do not exceed 26.9 A. This device maintains identical gate charge (24 nC) to the main part, ensuring compatible gate drive circuit performance. The 400 V voltage rating provides 10 V margin above the STGD20N40LZ specification. Lower on-state voltage (1.2 V versus 1.6 V) reduces conduction losses. Operating temperature range extends to -40°C minimum, which is acceptable for applications not requiring -55°C operation. All automotive qualifications and compliance certifications are maintained. Packaging is identical TO-252-3 DPAK format.

FGD3040G2-F085 Selection Criteria:

The FGD3040G2-F085 is suitable for applications requiring higher collector current capacity (41 A maximum). This device maintains full -55°C to 175°C operating temperature range, matching the main part specification. Gate charge is reduced to 21 nC, resulting in faster switching response. The 400 V voltage rating and TO-252-3 DPAK package provide full mechanical and electrical compatibility. All automotive-grade certifications and RoHS3 compliance are maintained. This substitute accommodates higher current applications while preserving thermal and environmental specifications.

Substitution Constraints:

Both substitute parts are qualified for direct substitution based on maintained AEC-Q101 automotive qualification, identical package geometry, logic input compatibility, and compliance certifications. Selection between substitutes depends on application-specific current requirements and minimum operating temperature constraints.

Frequently Asked Questions (FAQ)

Q: Can FGD3440G2-F085 or FGD3040G2-F085 be used as direct pin-for-pin replacements for STGD20N40LZ?

A: Yes. Both substitute parts use identical TO-252-3 DPAK package geometry with two leads plus tab configuration. Pin assignments and mechanical footprint are compatible for direct PCB substitution.

Q: What is the voltage margin provided by the substitute parts?

A: Both FGD3440G2-F085 and FGD3040G2-F085 are rated for 400 V collector-emitter breakdown voltage, providing 10 V margin above the STGD20N40LZ 390 V specification. This margin accommodates voltage transients and provides design safety.

Q: How do the on-state voltage characteristics compare?

A: The STGD20N40LZ exhibits 1.6 V on-state voltage at 4 V gate drive and 6 A collector current. FGD3440G2-F085 measures 1.2 V and FGD3040G2-F085 measures 1.25 V under identical test conditions. Lower on-state voltages in substitute parts reduce conduction losses and heat dissipation requirements.

Q: Are there operating temperature range differences?

A: The STGD20N40LZ and FGD3040G2-F085 both operate from -55°C to 175°C junction temperature. FGD3440G2-F085 operates from -40°C to 175°C. Applications requiring -55°C minimum operation must use FGD3040G2-F085 or the original STGD20N40LZ.

Q: Do the substitute parts maintain automotive qualification?

A: Yes. Both FGD3440G2-F085 and FGD3040G2-F085 carry AEC-Q101 automotive qualification identical to the main part. All three devices are ROHS3 compliant with MSL Level 1 rating.

Q: What are the gate charge differences and implications?

A: STGD20N40LZ and FGD3440G2-F085 both specify 24 nC gate charge. FGD3040G2-F085 specifies 21 nC. Lower gate charge reduces gate drive circuit power dissipation and enables faster switching transitions. Gate drive circuits designed for 24 nC operation accommodate 21 nC devices without modification.

Q: Which substitute part should be selected for maximum current capacity?

A: FGD3040G2-F085 provides 41 A maximum collector current, exceeding both the main part (25 A) and FGD3440G2-F085 (26.9 A). Selection of FGD3040G2-F085 is appropriate for applications requiring current capacity above 26.9 A while maintaining all other electrical and thermal specifications.

Q: Are packaging and moisture sensitivity specifications identical?

A: Yes. All three devices use TO-252-3 DPAK surface mount package with identical mechanical dimensions. Moisture sensitivity level is MSL 1 (Unlimited) for all parts, indicating no moisture sensitivity restrictions during storage or handling.