VS-25RIA40M Equivalent & Substitute Parts

Part Overview

The VS-25RIA40M is a silicon-controlled rectifier (SCR) rated for 400V off-state voltage with 40A RMS on-state current capability. Manufactured by Vishay General Semiconductor - Diodes Division, this thyristor is designed for standard recovery applications in chassis and stud mount configurations using the TO-208AA package. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range, ensuring functional interchangeability in target applications.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	400	V
Current - On State (It RMS)	40	A
Current - On State (It AV)	25	A
Voltage - Gate Trigger (Vgt Max)	2	V
Current - Gate Trigger (Igt Max)	60	mA
Voltage - On State (Vtm Max)	1.7	V
Current - Hold (Ih Max)	130	mA
Current - Off State (Max)	10	mA
Operating Temperature Range	-65 to 125	°C
Package / Case	TO-208AA (TO-48-3)	Stud Mount
SCR Type	Standard Recovery	-

Substitute Part Grouping Explanation

Substitution eligibility for the VS-25RIA40M is determined by strict equivalence across the following critical parameters:

Off-state voltage rating: 400V minimum
RMS on-state current: 40A minimum
Average on-state current: 25A minimum
Gate trigger voltage: 2V maximum
Gate trigger current: 60mA maximum
On-state voltage drop: 1.7V maximum
Hold current: 130mA maximum
Off-state leakage current: 10mA maximum
Operating temperature range: -65°C to 125°C minimum
Package compatibility: TO-208AA stud mount configuration
SCR recovery type: Standard Recovery

The VS-25RIA40 meets all substitution criteria as a direct parametric equivalent manufactured by the same supplier with identical electrical specifications and mechanical packaging.

Parameter Comparison

Parameter	VS-25RIA40M (Main)	VS-25RIA40 (Substitute)	Match Status
Voltage - Off State	400 V	400 V	Equivalent
Current - On State (It RMS)	40 A	40 A	Equivalent
Current - On State (It AV)	25 A	25 A	Equivalent
Voltage - Gate Trigger (Vgt Max)	2 V	2 V	Equivalent
Current - Gate Trigger (Igt Max)	60 mA	60 mA	Equivalent
Voltage - On State (Vtm Max)	1.7 V	1.7 V	Equivalent
Current - Hold (Ih Max)	130 mA	130 mA	Equivalent
Current - Off State (Max)	10 mA	10 mA	Equivalent
Current - Non Rep. Surge (50/60Hz)	350A / 370A	420A / 440A	Substitute Exceeds
Operating Temperature	-65 to 125 °C	-65 to 125 °C	Equivalent
Package / Case	TO-208AA (TO-48-3)	TO-208AA (TO-48-3)	Equivalent
SCR Type	Standard Recovery	Standard Recovery	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

The VS-25RIA40 is a direct substitute for the VS-25RIA40M based on identical electrical specifications and mechanical compatibility. Both parts maintain Active product status with full RoHS3 compliance and REACH unaffected designation. The substitute part demonstrates superior non-repetitive surge current capability (420A/440A versus 350A/370A), providing additional margin in transient conditions while maintaining all other electrical parameters within specification.

Selection between these parts should be based on availability and inventory requirements, as functional performance and compliance certifications are equivalent.

Frequently Asked Questions (FAQ)

Q: Can VS-25RIA40 replace VS-25RIA40M in existing designs?

A: Yes. Both parts are electrically equivalent across all specified parameters including voltage ratings, current ratings, gate trigger characteristics, and operating temperature range. The TO-208AA stud mount package is identical, ensuring mechanical compatibility without circuit board modification.

Q: What is the difference between these two part numbers?

A: The primary difference is non-repetitive surge current rating. VS-25RIA40 is rated for 420A/440A (50/60Hz) compared to VS-25RIA40M at 350A/370A. All other electrical and mechanical specifications are identical.

Q: Are both parts RoHS compliant?

A: Yes. Both VS-25RIA40M and VS-25RIA40 are ROHS3 compliant with MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: What packaging options are available?

A: Both parts are supplied in TO-208AA (TO-48-3) stud mount configuration. This is a chassis mount package with threaded stud for direct mounting to heat sinks or chassis structures.

Q: Can these parts be used interchangeably in high-surge applications?

A: Yes, with the advantage that VS-25RIA40 provides higher surge current margin (420A/440A versus 350A/370A). Both parts maintain identical steady-state current ratings and thermal characteristics.

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