2N691 Equivalent & Substitute Parts

Part Overview

The 2N691 is a silicon-controlled rectifier (SCR) rated for 700V off-state voltage with 25A RMS on-state current capability. Manufactured by Central Semiconductor Corp, this component features standard recovery characteristics and chassis/stud mount configuration in TO-48 packaging. The 2N691 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The VS-2N691 from Vishay General Semiconductor serves as the direct manufacturer-recommended substitute, maintaining electrical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	700	V
Current - On State (It (RMS)) (Max)	25	A
Voltage - Gate Trigger (Vgt) (Max)	2	V
Current - Gate Trigger (Igt) (Max)	40	mA
Voltage - On State (Vtm) (Max)	2	V
Current - Hold (Ih) (Max)	100	mA
Operating Temperature Range	-65 to 125	°C
SCR Type	Standard Recovery	—
Mounting Type	Chassis, Stud Mount	—
Package / Case	TO-208AA, TO-48-3, Stud	—

Substitute Part Grouping Explanation

Substitution of the 2N691 with the VS-2N691 is based on electrical and mechanical parameter equivalence within the allowed tolerance range for this SCR category. The substitute part maintains the following critical parameters:

Off-state voltage rating: 700V (identical)
Gate trigger voltage (Vgt): 2V maximum (identical)
Gate trigger current (Igt): 40mA maximum (identical)
On-state voltage (Vtm): 2V maximum (identical)
RMS on-state current: 25A maximum (identical)
Operating temperature range: -65°C to 125°C (identical)
SCR type: Standard Recovery (identical)
Mounting configuration: Chassis, Stud Mount (identical)
Package designation: TO-208AA (TO-48) equivalent form factor (compatible)

The VS-2N691 qualifies as a direct substitute based on these matched electrical specifications and compatible mechanical packaging, despite minor variations in hold current (20mA vs. 100mA) and off-state leakage current (2.25mA vs. 4.5mA), which represent improved performance characteristics.

Parameter Comparison

Parameter	2N691 (Central Semiconductor)	VS-2N691 (Vishay)	Match Status
Voltage - Off State	700 V	700 V	Identical
Voltage - Gate Trigger (Vgt) (Max)	2 V	2 V	Identical
Current - Gate Trigger (Igt) (Max)	40 mA	40 mA	Identical
Voltage - On State (Vtm) (Max)	2 V	2 V	Identical
Current - On State (It (RMS)) (Max)	25 A	25 A	Identical
Current - Hold (Ih) (Max)	100 mA	20 mA	Compatible (improved)
Current - Off State (Max)	4.5 mA	2.25 mA	Compatible (improved)
Operating Temperature	-65°C to 125°C	-65°C to 125°C	Identical
SCR Type	Standard Recovery	Standard Recovery	Identical
Mounting Type	Chassis, Stud Mount	Chassis, Stud Mount	Identical
Package / Case	TO-208AA, TO-48-3, Stud	TO-208AA, TO-48-3, Stud	Identical
Product Status	Obsolete	Active	Substitute is active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute is compliant

Engineering Selection Recommendations

The VS-2N691 is the appropriate substitute for the obsolete 2N691 based on the following engineering criteria:

Product Status: The 2N691 is classified as obsolete, creating supply chain risk for new designs and production continuity. The VS-2N691 maintains active product status with confirmed inventory availability (802 pcs), ensuring long-term sourcing reliability.

Electrical Equivalence: All critical electrical parameters match the original specification. The VS-2N691 demonstrates improved performance in hold current and off-state leakage current, representing enhanced device characteristics that do not compromise circuit compatibility.

Compliance and Certifications: The VS-2N691 is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The original 2N691 is RoHS non-compliant, making the substitute necessary for applications subject to environmental compliance mandates.

Mechanical Compatibility: Both devices utilize identical mounting configuration (chassis, stud mount) and equivalent package designations (TO-208AA/TO-48), ensuring direct mechanical interchangeability without circuit board redesign.

Frequently Asked Questions (FAQ)

Q: Can the VS-2N691 be used as a direct replacement for the 2N691 in existing designs?

A: Yes. The VS-2N691 maintains identical electrical ratings for off-state voltage (700V), gate trigger parameters (2V, 40mA), on-state voltage (2V), and RMS current (25A). Mechanical mounting and package form factors are equivalent. No circuit modifications are required.

Q: What are the key differences between the 2N691 and VS-2N691?

A: The primary differences are product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and improved performance in hold current (100mA vs. 20mA) and off-state leakage (4.5mA vs. 2.25mA). These differences favor the VS-2N691 for new applications.

Q: Are there any package compatibility concerns?

A: No. Both devices use TO-208AA (TO-48) packaging with chassis/stud mount configuration. The mechanical interface and mounting requirements are identical.

Q: Why is the 2N691 obsolete?

A: The 2N691 is listed as obsolete by the original manufacturer. The VS-2N691 serves as the manufacturer-recommended active substitute, ensuring continued availability and compliance with current regulatory standards.

Q: What certifications does the VS-2N691 carry?

A: The VS-2N691 is ROHS3 compliant and REACH unaffected. The original 2N691 is RoHS non-compliant, making the substitute necessary for applications requiring environmental compliance.

Q: Can I mix 2N691 and VS-2N691 devices in the same circuit?

A: Yes. Electrical and mechanical parameters are equivalent, allowing both devices to function identically within the same application. However, sourcing the obsolete 2N691 is not recommended for new production.

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