VS-81RIA80M Equivalent & Substitute Parts

Part Overview

The VS-81RIA80M is an 800V, 125A SCR (Silicon Controlled Rectifier) manufactured by Vishay General Semiconductor - Diodes Division. This thyristor operates as a standard recovery device in a TO-209AC chassis stud mount package, designed for high-voltage switching applications requiring robust current handling. The part is currently active in production with 1061 units in stock. Equivalent parts are identified when they maintain identical electrical specifications and mechanical compatibility, ensuring direct substitution without circuit redesign.

Key Parameters

Parameter	Value
Voltage - Off State	800 V
Current - On State (It (RMS)) (Max)	125 A
Current - On State (It (AV)) (Max)	80 A
Voltage - Gate Trigger (Vgt) (Max)	2.5 V
Current - Gate Trigger (Igt) (Max)	120 mA
Voltage - On State (Vtm) (Max)	1.6 V
Current - Hold (Ih) (Max)	200 mA
Current - Off State (Max)	15 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	1600A, 1675A
SCR Type	Standard Recovery
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-209AC, TO-94-4, Stud
Mounting Type	Chassis, Stud Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the VS-81RIA80M is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must match:

Off-state voltage rating: 800 V
RMS on-state current capacity: 125 A
Average on-state current capacity: 80 A
Gate trigger voltage and current thresholds: 2.5 V (max) and 120 mA (max)
On-state voltage drop: 1.6 V (max)
Hold current: 200 mA (max)
Off-state leakage current: 15 mA (max)
Non-repetitive surge current: 1600A / 1675A (50/60Hz)
SCR recovery type: Standard Recovery
Package configuration: TO-209AC stud mount
Temperature operating range: -40°C to 125°C
Compliance certifications: ROHS3, REACH Unaffected

Parameter Comparison

Parameter	VS-81RIA80M	VS-80RIA80PBF	Match
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Yes
Category	Thyristors	Thyristors	Yes
Voltage - Off State	800 V	800 V	Yes
Current - On State (It (RMS)) (Max)	125 A	125 A	Yes
Current - On State (It (AV)) (Max)	80 A	80 A	Yes
Voltage - Gate Trigger (Vgt) (Max)	2.5 V	2.5 V	Yes
Current - Gate Trigger (Igt) (Max)	120 mA	120 mA	Yes
Voltage - On State (Vtm) (Max)	1.6 V	1.6 V	Yes
Current - Hold (Ih) (Max)	200 mA	200 mA	Yes
Current - Off State (Max)	15 mA	15 mA	Yes
Current - Non Rep. Surge 50, 60Hz (Itsm)	1600A, 1675A	1600A, 1675A	Yes
SCR Type	Standard Recovery	Standard Recovery	Yes
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	Yes
Package / Case	TO-209AC, TO-94-4, Stud	TO-209AC, TO-94-4, Stud	Yes
Mounting Type	Chassis, Stud Mount	Chassis, Stud Mount	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
Product Status	Active	Active	Yes

Engineering Selection Recommendations

Both the VS-81RIA80M and VS-80RIA80PBF are active production parts from Vishay General Semiconductor - Diodes Division with full ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on inventory availability and lead time requirements. The VS-81RIA80M currently has 1061 units in stock, while the VS-80RIA80PBF has 786 units available. Both parts satisfy identical electrical performance and mechanical mounting requirements for 800V, 125A SCR applications in TO-209AC stud mount configurations.

Frequently Asked Questions (FAQ)

Q: Can VS-80RIA80PBF replace VS-81RIA80M in existing designs?

A: Yes. Both parts are parametrically identical across all electrical specifications, gate trigger characteristics, thermal ratings, and mechanical package configurations. Direct substitution is valid without circuit modification.

Q: What determines if a part is a valid substitute for the VS-81RIA80M?

A: A valid substitute must match all parameters: 800V off-state voltage, 125A RMS on-state current, 80A average on-state current, 2.5V gate trigger voltage, 120mA gate trigger current, 1.6V on-state voltage drop, 200mA hold current, 15mA off-state leakage, 1600A/1675A surge current ratings, standard recovery type, TO-209AC stud mount package, -40°C to 125°C operating range, and ROHS3/REACH compliance.

Q: Are there differences in the part numbers VS-81RIA80M and VS-80RIA80PBF?

A: The part numbers reflect different base product designations (81RIA80 vs. 80RIA80) and packaging codes (M vs. PBF), but the electrical and mechanical specifications are identical. Both are manufactured by Vishay and meet the same performance standards.

Q: What is the TO-209AC package?

A: TO-209AC is a stud mount package configuration also designated as TO-94-4. It is designed for chassis mounting applications requiring direct thermal coupling to a heat sink or mounting surface.

Q: Are both parts RoHS compliant?

A: Yes. Both VS-81RIA80M and VS-80RIA80PBF are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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