MASMBJ14A Equivalent & Substitute Parts

Part Overview

The MASMBJ14A 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 is currently active in production with military-grade qualification per MIL-PRF-19500. Substitute parts are necessary when the primary manufacturer part is unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits equivalent electrical performance from alternative manufacturers.

Substiute Parts

MASMBJ14A

Microchip TechnologyIn Stock: 1052MASMBJ14A Datasheet

Current PartRFQ

SMBJ14A-13

Diodes IncorporatedIn Stock: 4035SMBJ14A-13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MASMBJ14A is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Voltage - Reverse Standoff (Typ): 14V
• Voltage - Clamping (Max) @ Ipp: 23.2V
• Current - Peak Pulse (10/1000µs): 25.8A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA or SMB
• Mounting Type: Surface Mount
• Type: Zener
• Unidirectional Channels: 1

The substitute part SMBJ14A-13 from Diodes Incorporated meets all critical electrical parameters and maintains the same surface-mount package configuration. Both parts share the same base product number (SMBJ14) and are classified within the same TVS diode category for general-purpose applications. Substitution is valid where the operating temperature range and compliance status are acceptable for the specific application.

Parameter Comparison

*The SMBJ14A-13 operates from -55°C minimum versus -65°C for the MASMBJ14A. Applications requiring operation below -55°C must retain the primary part.

Engineering Selection Recommendations

Primary Part (MASMBJ14A - Microchip Technology): Select this part when military-grade qualification per MIL-PRF-19500 is a design requirement. The extended operating temperature range of -65°C to 150°C supports applications requiring low-temperature performance. Active production status ensures long-term availability and supply continuity.

Substitute Part (SMBJ14A-13 - Diodes Incorporated): This part provides electrical equivalence across all critical TVS parameters and is suitable for general-purpose applications where military qualification is not mandated. The operating temperature range of -55°C to 150°C covers standard industrial and commercial temperature requirements. Note that this part is discontinued at DiGi Electronics; verify current availability through alternative distribution channels before design implementation.

Selection Criteria:

• If MIL-PRF-19500 qualification is required: use MASMBJ14A
• If operating temperature must reach -65°C: use MASMBJ14A
• If general-purpose protection with standard temperature range is acceptable: SMBJ14A-13 is electrically equivalent
• Both parts share identical electrical performance for clamping voltage, peak pulse current, and power dissipation

Frequently Asked Questions (FAQ)

Q: Can SMBJ14A-13 be used as a direct replacement for MASMBJ14A in all applications?

A: SMBJ14A-13 provides electrical equivalence for all critical TVS parameters (clamping voltage, peak pulse current, power dissipation). However, two conditions must be verified: (1) If military qualification per MIL-PRF-19500 is contractually required, the MASMBJ14A must be retained; (2) If the application operates below -55°C, the MASMBJ14A is required due to its extended temperature range to -65°C.

Q: Are the package dimensions identical between MASMBJ14A and SMBJ14A-13?

A: Both parts use the DO-214AA (SMB) surface-mount package. The physical footprint and land pattern are identical, permitting direct PCB layout compatibility without modification.

Q: What is the difference between the base product number SMBJ14 and the full part numbers?

A: The base product number SMBJ14 identifies the voltage class and package family. The full part numbers (MASMBJ14A and SMBJ14A-13) include manufacturer-specific suffixes that denote the exact manufacturer, packaging configuration, and internal specifications. Both parts share the same SMBJ14 base designation, confirming electrical equivalence.

Q: Why is SMBJ14A-13 listed as discontinued at DiGi Electronics?

A: Discontinuation at a specific distributor does not indicate end-of-life status. The part may remain available through alternative distribution channels or directly from Diodes Incorporated. Verify current availability and lead times with secondary suppliers before committing to design changes.

Q: Are there compliance or certification differences between these parts?

A: Both parts are RoHS non-compliant, REACH Unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). The primary compliance difference is that MASMBJ14A carries military-grade qualification per MIL-PRF-19500, while SMBJ14A-13 does not. This distinction is relevant only for applications with military specification requirements.

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

A: Yes, from a physical and electrical standpoint. Both parts use the DO-214AA package with identical pin configuration and footprint. Electrical performance is equivalent across all specified parameters within the overlapping temperature range (-55°C to 150°C). Design documentation and bill of materials must be updated to reflect any part substitution.