B551-2T SCR Module Equivalent & Substitute Parts

Part Overview

The B551-2T is a thyristor module manufactured by Sensata Technologies, classified as a 1-Phase Controller SCR module with chassis mount configuration. This component is designed for 400V off-state operation with dual SCR architecture and .250" quick-connect terminals. The B551-2T is currently listed as obsolete, making identification of functionally equivalent substitute parts essential for system maintenance, repair, and component sourcing in legacy applications.

Substiute Parts

B551-2T

Sensata TechnologiesIn Stock: 3312B551-2T Datasheet

Current PartRFQ

B551SE-2T

Sensata-CrydomIn Stock: 791B551SE-2T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B551-2T is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage Rating: Off-state voltage must be 400V
• Gate Trigger Specifications: Vgt (Max) 2.5V and Igt (Max) 60mA
• Surge Current Capability: 250A @ 60Hz non-repetitive surge rating
• Thermal Range: Operating temperature -40°C to 125°C
• SCR Configuration: Dual SCR (2 SCRs) architecture
• Mounting and Packaging: Chassis mount module with .250" quick-connect terminals
• Series Designation: B-2T series classification

The B551SE-2T meets all specified electrical and mechanical parameters and is classified as a direct substitute within the B-2T series.

Parameter Comparison

Engineering Selection Recommendations

The B551SE-2T is the direct equivalent substitute for the obsolete B551-2T. Both components share identical electrical specifications, thermal operating range, and mechanical configuration within the B-2T series. The B551SE-2T maintains active product status with current manufacturing support and RoHS compliance certification, making it the appropriate selection for applications requiring the B551-2T specification.

Component selection should be based on availability and supply chain requirements. The B551SE-2T is available in bulk packaging and maintains full electrical and mechanical compatibility with the original B551-2T design.

Frequently Asked Questions (FAQ)

Q: Can the B551SE-2T directly replace the B551-2T in existing applications?

A: Yes. The B551SE-2T meets all electrical parameters (400V off-state voltage, 2.5V gate trigger voltage, 60mA gate trigger current, 250A surge current) and mechanical specifications (.250" quick-connect terminals, chassis mount configuration) required for B551-2T operation.

Q: What is the primary difference between the B551-2T and B551SE-2T?

A: The B551-2T is obsolete with no active manufacturing. The B551SE-2T is the active equivalent, manufactured by Sensata-Crydom, with RoHS compliance certification and current inventory availability.

Q: Are there packaging differences between these parts?

A: The B551-2T packaging is not specified in available documentation. The B551SE-2T is supplied in bulk packaging. Both maintain identical module form factor and .250" quick-connect terminal configuration.

Q: What certifications apply to the B551SE-2T?

A: The B551SE-2T is RoHS compliant and carries ECCN EAR99 classification with HTSUS code 8541.30.0080.

Q: Are there thermal or electrical derating considerations for substitution?

A: No. Both components operate across the identical temperature range (-40°C to 125°C junction temperature) and carry the same electrical ratings. No derating or thermal adjustment is required for substitution.