MXLSMBJ51CA Equivalent & Substitute Parts

Part Overview

The MXLSMBJ51CA is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a reverse standoff voltage of 51V and provides clamping at 82.4V maximum, with a peak pulse current rating of 7.3A. The component is housed in a DO-214AA (SMB) package and is qualified to MIL-PRF-19500 military standards.

The MXLSMBJ51CA is currently active in production. Identifying equivalent and substitute parts is necessary when the primary part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits the use of functionally equivalent components from different manufacturers.

Substiute Parts

MXLSMBJ51CA

Microchip TechnologyIn Stock: 880MXLSMBJ51CA Datasheet

Current PartRFQ

SMBJ51CA-13

Diodes IncorporatedIn Stock: 1042SMBJ51CA-13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MXLSMBJ51CA 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
• Bidirectional Channels: 1
• Type: Zener

The substitute part SMBJ51CA-13 from Diodes Incorporated meets all critical electrical parameters and is housed in the same DO-214AA/SMB package. This part is functionally equivalent for general-purpose transient voltage suppression applications. The SMBJ51CA-13 is listed as discontinued at DiGi Electronics; however, it remains available through alternative distribution channels and serves as a direct electrical equivalent.

Additional substitute parts referenced (SZ1SMB51CAT3G, TV06B510JB-G, SMBJ51CA-TP, SMBJ51CAE3/TR13, SMBJ51CA-HRA) are cross-referenced variants that maintain the same electrical specifications and package form factor.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (MXLSMBJ51CA): The Microchip Technology MXLSMBJ51CA is the recommended selection for new designs and applications requiring active production status. This part carries MIL-PRF-19500 military qualification and is currently in active production with 790 units in stock. The extended operating temperature range of -65°C to 150°C provides broader environmental coverage compared to the substitute part.

Substitute Part (SMBJ51CA-13): The Diodes Incorporated SMBJ51CA-13 is electrically equivalent and suitable for applications where the primary part is unavailable. This part is listed as discontinued at DiGi Electronics but remains available through alternative distribution channels. The operating temperature range is -55°C to 150°C, which is acceptable for most general-purpose applications but does not extend to the lower temperature limit of the primary part. Both parts are RoHS non-compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Compliance Considerations: Both the primary and substitute parts are RoHS non-compliant and REACH unaffected. Both carry ECCN EAR99 and HTSUS 8541.10.0080 classifications. Selection between these parts should account for supply availability, production status, and specific operating temperature requirements of the application.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ51CA-13 be used as a direct replacement for the MXLSMBJ51CA?

A: Yes. The SMBJ51CA-13 is electrically equivalent across all critical parameters: reverse standoff voltage (51V), clamping voltage (82.4V), peak pulse current (7.3A), and peak pulse power (600W). Both parts use the DO-214AA/SMB package and are bidirectional Zener diodes. The primary difference is the operating temperature range: the MXLSMBJ51CA operates from -65°C to 150°C, while the SMBJ51CA-13 operates from -55°C to 150°C. For applications within the -55°C to 150°C range, direct substitution is valid.

Q: What is the significance of the DO-214AA and SMB package designations?

A: DO-214AA and SMB refer to the same physical package form factor for surface-mount diodes. These designations are interchangeable and describe a standardized package with identical footprint, lead spacing, and mounting characteristics. Both the primary and substitute parts use this package, ensuring mechanical and electrical compatibility on the same PCB layout.

Q: Why is the SMBJ51CA-13 listed as discontinued at DiGi Electronics if it is a suitable substitute?

A: Discontinuation at a specific distributor does not indicate unavailability across all supply channels. The SMBJ51CA-13 may remain available through alternative distributors or direct manufacturer channels. Distributor inventory status is dynamic and reflects only that distributor's current stock position. Availability should be verified through multiple sourcing channels before finalizing component selection.

Q: Are there differences in military qualification between the primary and substitute parts?

A: The MXLSMBJ51CA carries MIL-PRF-19500 military qualification. The SMBJ51CA-13 specification data provided does not include military qualification information. For applications requiring military-grade components, the MXLSMBJ51CA is the appropriate selection.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. These parts do not require special moisture-control handling during storage, transportation, or assembly. Both the primary and substitute parts carry this rating, eliminating moisture-related compatibility concerns.

Q: Can these TVS diodes be used interchangeably in power line protection applications?

A: No. Both the MXLSMBJ51CA and SMBJ51CA-13 are specified for general-purpose applications with Power Line Protection marked as "No." These components are not rated or qualified for direct power line protection duty. Application-specific power line protection components must be selected for such use cases.