MXLSMBJ14A Equivalent & Substitute Parts

Part Overview

The MXLSMBJ14A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 14V reverse standoff voltage with a 23.2V maximum clamping voltage and 25.8A peak pulse current capability in a DO-214AA (SMB) package. The part maintains active product status with military-grade qualification per MIL-PRF-19500. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when design requirements permit functional alternatives.

Substiute Parts

MXLSMBJ14A

Microchip TechnologyIn Stock: 1130MXLSMBJ14A Datasheet

Current PartRFQ

SMBJ14A-13

Diodes IncorporatedIn Stock: 4035SMBJ14A-13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MXLSMBJ14A is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 14V
• Voltage - Breakdown (Min): 15.6V
• Voltage - Clamping (Max) @ Ipp: 23.2V
• Current - Peak Pulse (10/1000µs): 25.8A
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Type: Zener

Mechanical Equivalence Criteria:

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount

Acceptable Parameter Variations:

• Operating Temperature Range: Substitute parts may have a narrower minimum temperature specification (-55°C minimum is acceptable for -65°C to 150°C applications when thermal environment permits)
• Product Status: Discontinued parts are acceptable substitutes when electrical and mechanical parameters are identical

The substitute part SMBJ14A-13 (Diodes Incorporated) meets all electrical and mechanical equivalence criteria. Its operating temperature range of -55°C to 150°C represents a narrower specification at the low end compared to the MXLSMBJ14A (-65°C to 150°C), but remains functionally equivalent for applications not requiring operation below -55°C.

Parameter Comparison

*Operating temperature range difference: SMBJ14A-13 has a minimum operating temperature of -55°C versus -65°C for MXLSMBJ14A. This represents an acceptable substitution for applications where the minimum ambient or junction temperature does not fall below -55°C.

Engineering Selection Recommendations

Primary Selection (MXLSMBJ14A - Microchip Technology): The MXLSMBJ14A is the recommended primary component selection. It maintains active product status, carries military-grade qualification per MIL-PRF-19500, and provides the full operating temperature range of -65°C to 150°C. This part is suitable for applications requiring extended low-temperature operation and military-specification compliance.

Substitute Selection (SMBJ14A-13 - Diodes Incorporated): The SMBJ14A-13 is a direct electrical and mechanical equivalent with identical voltage and current ratings. However, this part is discontinued at DiGi Electronics and has a reduced minimum operating temperature specification (-55°C versus -65°C). This substitute is appropriate for applications where:

• The minimum operating temperature requirement does not extend below -55°C
• Supply chain continuity requires an alternative source
• Military-grade qualification is not a design requirement

Both parts share identical RoHS non-compliance status, REACH unaffected status, and MSL rating, ensuring consistent compliance posture in the design.

Frequently Asked Questions (FAQ)

Q: Can SMBJ14A-13 be used as a direct replacement for MXLSMBJ14A in all applications?

A: SMBJ14A-13 is a direct electrical and mechanical equivalent for applications where the minimum operating temperature does not fall below -55°C. The MXLSMBJ14A supports operation down to -65°C. If your application requires operation below -55°C, the MXLSMBJ14A is the required selection. For applications with minimum temperatures at or above -55°C, SMBJ14A-13 provides full functional equivalence.

Q: Are there any package compatibility differences between these parts?

A: Both the MXLSMBJ14A and SMBJ14A-13 use the DO-214AA (SMB) surface-mount package. They are mechanically and electrically compatible for PCB layout and assembly purposes. No package modifications or design changes are required when substituting between these parts.

Q: What is the significance of the discontinued status of SMBJ14A-13?

A: SMBJ14A-13 is discontinued at DiGi Electronics, indicating it is no longer actively stocked by this distributor. However, it may remain available through other component suppliers or in existing inventory. Discontinued status does not affect the electrical or mechanical performance of the part; it reflects supply availability only. For new designs or long-term production, the active MXLSMBJ14A is the preferred selection.

Q: Do both parts meet the same compliance and qualification standards?

A: The MXLSMBJ14A carries military-grade qualification per MIL-PRF-19500. The SMBJ14A-13 does not list this qualification. Both parts are RoHS non-compliant and REACH unaffected. If military qualification is a design requirement, the MXLSMBJ14A is the mandatory selection.

Q: What are the key electrical parameters that must match for substitution?

A: The critical parameters for TVS diode substitution are: Voltage - Reverse Standoff (14V), Voltage - Breakdown (15.6V minimum), Voltage - Clamping (23.2V maximum), Current - Peak Pulse (25.8A), and Power - Peak Pulse (600W). Both parts match these specifications exactly, confirming functional equivalence for overvoltage protection applications.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Both parts use identical DO-214AA (SMB) surface-mount packages with the same pinout and footprint. They can be used interchangeably on the same PCB assembly without design modifications, provided the operating temperature requirements are met.