SCT625B Equivalent & Substitute Parts Reference

Part Overview

The SCT625B is a Silicon Controlled Rectifier (SCR) rated for 600 V off-state voltage with 25 A on-state current capacity. This component is classified as a standard recovery thyristor in through-hole TO-220-3 package configuration. The SCT625B is currently listed as obsolete product status, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical performance parameters and mechanical compatibility within the specified operating range of -40°C to 125°C junction temperature.

Substiute Parts

SCT625B

SMC Diode SolutionsIn Stock: 1011SCT625B Datasheet

Current PartRFQ

SCT625C

SMC Diode SolutionsIn Stock: 1002SCT625C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCT625B is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Electrical Parameters (Must Match Exactly):

• Voltage - Off State: 600 V
• Voltage - Gate Trigger (Vgt) (Max): 1.3 V
• Current - Gate Trigger (Igt) (Max): 40 mA
• Voltage - On State (Vtm) (Max): 1.55 V
• Current - On State (It (RMS)) (Max): 25 A
• Current - Hold (Ih) (Max): 80 mA
• Current - Off State (Max): 10 µA
• Current - Non Rep. Surge 50, 60Hz (Itsm): 300 A @ 50Hz
• SCR Type: Standard Recovery
• Operating Temperature Range: -40°C to 125°C (TJ)

Mechanical Parameters (Must Match Exactly):

• Mounting Type: Through Hole
• Package / Case: TO-220-3
• Base Product Number: SCT625

Substitute parts must satisfy all parameters listed above without deviation. Package variant designations (TO-220B, TO-220C) represent different lead configurations within the TO-220-3 case family and are considered compatible within this substitution framework.

Parameter Comparison

Engineering Selection Recommendations

The SCT625C is a direct electrical and mechanical equivalent to the SCT625B. All specified electrical parameters, operating temperature range, and mechanical mounting characteristics are identical. The primary distinction is product status: SCT625B is obsolete while SCT625C maintains active product status from SMC Diode Solutions.

The supplier device package designation differs (TO-220B versus TO-220C), representing alternative lead configurations within the TO-220-3 case family. Both configurations are compatible with standard TO-220-3 footprints and mounting hardware.

Compliance certifications (ECCN: EAR99; HTSUS: 8541.30.0080) are identical for both parts, ensuring regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can SCT625C directly replace SCT625B in existing designs?

A: Yes. All electrical parameters, operating temperature specifications, and mechanical mounting characteristics are identical. The components are functionally equivalent for circuit operation.

Q: What is the difference between TO-220B and TO-220C package designations?

A: Both designations refer to variants within the TO-220-3 case family. The difference pertains to lead configuration and spacing. Both are compatible with standard TO-220-3 through-hole PCB footprints and mounting hardware.

Q: Why is SCT625B listed as obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. SCT625C represents the active equivalent from the same manufacturer with identical electrical specifications.

Q: Are there inventory differences between SCT625B and SCT625C?

A: SCT625B inventory is listed as 934 pieces. SCT625C inventory is listed as 957 pieces. Availability should be confirmed with the supplier for current procurement requirements.

Q: Do the parts share the same base product number?

A: Yes. Both SCT625B and SCT625C share base product number SCT625, indicating they are variants within the same product family.

Q: What are the critical electrical parameters for substitution?

A: The following parameters must match for substitution eligibility: 600 V off-state voltage, 1.3 V maximum gate trigger voltage, 40 mA maximum gate trigger current, 1.55 V maximum on-state voltage, 25 A maximum on-state RMS current, 80 mA maximum hold current, 10 µA maximum off-state current, and 300 A non-repetitive surge current at 50 Hz.

Q: Are compliance certifications identical?

A: Yes. Both parts carry identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications.