MASMBJ51CA Equivalent & Substitute Parts

Part Overview

The MASMBJ51CA is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 51V reverse standoff voltage with an 82.4V maximum clamping voltage and 7.3A peak pulse current capability in a DO-214AA (SMB) package. The part is currently active in production with 920 units in stock. Substitute parts are necessary when the primary manufacturer part becomes unavailable, when supply chain constraints require alternative sourcing, or when design flexibility permits equivalent performance specifications from alternative manufacturers.

Substiute Parts

MASMBJ51CA

Microchip TechnologyIn Stock: 1022MASMBJ51CA Datasheet

Current PartRFQ

SMBJ51CA-13

Diodes IncorporatedIn Stock: 1042SMBJ51CA-13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MASMBJ51CA is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 51V
• Voltage - Clamping (Max) @ Ipp: 82.4V
• Current - Peak Pulse (10/1000µs): 7.3A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA or SMB
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

The substitute part SMBJ51CA-13 from Diodes Incorporated meets all critical electrical parameters and maintains the same surface-mount package configuration. This part is functionally equivalent for circuit protection applications requiring identical voltage suppression and current handling characteristics. The SMBJ51CA-13 is listed as discontinued at DiGi Electronics; however, it remains available through alternative distribution channels and serves as a direct functional equivalent.

Parameter Comparison

*Operating temperature minimum differs: MASMBJ51CA operates to -65°C; SMBJ51CA-13 operates to -55°C. Applications requiring operation below -55°C require the MASMBJ51CA.

Engineering Selection Recommendations

Primary Part Selection: The MASMBJ51CA remains the recommended choice for new designs and applications where the extended lower operating temperature range (-65°C minimum) is required. This part is currently active in production with adequate inventory availability.

Substitute Part Selection: The SMBJ51CA-13 from Diodes Incorporated is electrically and mechanically equivalent for applications operating within the -55°C to 150°C temperature range. This substitute is appropriate for:

• Replacement in existing designs where the lower temperature limit is not a constraint
• Supply chain diversification when primary manufacturer allocation is limited
• Applications where component availability from alternative sources is prioritized

Compliance Considerations: Both the primary part and substitute are RoHS non-compliant and carry identical REACH and ECCN classifications (EAR99). No compliance advantage exists between the two options. Both parts maintain MSL 1 (Unlimited) moisture sensitivity rating, requiring no special handling during storage or assembly.

Product Status Impact: The SMBJ51CA-13 is listed as discontinued at DiGi Electronics. Designers should verify current availability through alternative authorized distributors before committing to this substitute in production designs. The MASMBJ51CA maintains active production status and represents the more stable long-term sourcing option.

Frequently Asked Questions (FAQ)

Q: Can SMBJ51CA-13 be used as a direct replacement for MASMBJ51CA in all applications?

A: The SMBJ51CA-13 is electrically and mechanically equivalent for applications operating within -55°C to 150°C. Applications requiring operation below -55°C must use the MASMBJ51CA, as the substitute part's minimum operating temperature is -55°C versus -65°C for the primary part.

Q: Are there package compatibility concerns between these parts?

A: No. Both parts use identical DO-214AA (SMB) surface-mount packages. PCB footprints, solder reflow profiles, and assembly processes are interchangeable.

Q: What is the significance of the "discontinued at DiGi Electronics" status for SMBJ51CA-13?

A: This designation indicates the part is no longer actively stocked by DiGi Electronics distribution. However, discontinuation at a single distributor does not mean the part is unavailable globally. Availability should be verified through alternative authorized distributors before design commitment.

Q: Do the electrical parameters differ between MASMBJ51CA and SMBJ51CA-13?

A: No. All critical electrical parameters are identical: 51V reverse standoff voltage, 82.4V clamping voltage, 7.3A peak pulse current, and 600W peak pulse power. The only difference is the operating temperature minimum (-65°C versus -55°C).

Q: Are there any compliance or certification differences?

A: No. Both parts carry identical RoHS non-compliant status, REACH Unaffected classification, EAR99 ECCN designation, and MSL 1 moisture sensitivity rating. No compliance advantage exists between the two options.

Q: What additional substitute parts are referenced for SMBJ51CA-13?

A: The SMBJ51CA-13 datasheet references the following additional substitutes: SZ1SMB51CAT3G, TV06B510JB-G, SMBJ51CA-TP, SMBJ51CAE3/TR13, and SMBJ51CA-HRA. These parts share the same electrical specifications and package configuration but are not included in this analysis as they were not provided in the primary input parameters.