MSMBJ170A Equivalent & Substitute Parts

Part Overview

The MSMBJ170A 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 170V reverse standoff voltage with a 275V maximum clamping voltage and 2.2A 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. Identification of equivalent and substitute parts is necessary to address supply chain continuity, inventory management, and design flexibility across manufacturing environments.

Substiute Parts

MSMBJ170A

Microchip TechnologyIn Stock: 939MSMBJ170A Datasheet

Current PartRFQ

SMBJ170A-13

Diodes IncorporatedIn Stock: 969SMBJ170A-13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MSMBJ170A is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 170V
• Voltage - Breakdown (Min): 189V
• Voltage - Clamping (Max) @ Ipp: 275V
• Current - Peak Pulse (10/1000µs): 2.2A
• Power - Peak Pulse: 600W
• Type: Zener
• Unidirectional Channels: 1

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount
• Package / Case: DO-214AA, SMB
• Base Product Number: SMBJ170

Parts meeting all electrical and mechanical parameters are classified as direct substitutes. Variations in operating temperature range, product status, or manufacturer do not disqualify substitution when all primary electrical and package specifications are identical.

Parameter Comparison

*Operating temperature minimum differs: MSMBJ170A operates to -65°C; SMBJ170A-13 operates to -55°C. For applications requiring operation below -55°C, the MSMBJ170A is required.

Engineering Selection Recommendations

MSMBJ170A (Microchip Technology) is the primary specification. This part is currently active in production with military-grade qualification per MIL-PRF-19500 and maintains the widest operating temperature range (-65°C to 150°C). Selection of this part is appropriate for applications requiring military-grade compliance, extended low-temperature operation, or long-term supply assurance.

SMBJ170A-13 (Diodes Incorporated) is electrically and mechanically equivalent across all critical parameters. This part is discontinued at DiGi Electronics, which may impact long-term availability. The operating temperature range is narrower (-55°C to 150°C), restricting use in applications requiring operation below -55°C. This substitute is suitable for applications operating within the -55°C to 150°C range where military qualification is not required and current inventory is available.

Selection between these parts should be based on:

• Supply chain availability and lead time requirements
• Operating temperature range requirements
• Military qualification necessity
• Inventory status and procurement timeline

Frequently Asked Questions (FAQ)

Q: Can SMBJ170A-13 be used as a direct replacement for MSMBJ170A in all applications?

A: SMBJ170A-13 is electrically and mechanically equivalent for applications operating within -55°C to 150°C. Applications requiring operation below -55°C must use MSMBJ170A. Applications requiring military-grade qualification per MIL-PRF-19500 must use MSMBJ170A.

Q: What is the significance of the different operating temperature ranges?

A: MSMBJ170A operates from -65°C to 150°C, while SMBJ170A-13 operates from -55°C to 150°C. The 10°C difference at the lower temperature limit affects suitability for extreme cold-environment applications. Verify application temperature requirements before substitution.

Q: Are both parts in the same package?

A: Yes. Both MSMBJ170A and SMBJ170A-13 use the DO-214AA (SMB) surface-mount package. No PCB layout or footprint changes are required for substitution.

Q: What does "discontinued at DiGi Electronics" mean for SMBJ170A-13?

A: This designation indicates that DiGi Electronics, a major electronics distributor, no longer actively stocks or procures this part. Availability through other distributors or direct manufacturer channels may vary. Verify current inventory status with your supplier before committing to this substitute.

Q: Are the electrical specifications identical between these parts?

A: Yes. Both parts share identical specifications for voltage ratings (170V standoff, 189V breakdown minimum, 275V clamping maximum), peak pulse current (2.2A), and peak pulse power (600W). Substitution is valid from an electrical performance standpoint within the overlapping temperature range.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS non-compliant, REACH Unaffected, and carry ECCN EAR99 classification. MSMBJ170A additionally holds military-grade qualification per MIL-PRF-19500. Verify compliance requirements for your specific application and regulatory environment.

Q: Can I substitute MSMBJ170A with SMBJ170A-13 in a military application?

A: No. Military applications requiring MIL-PRF-19500 qualification must use MSMBJ170A. SMBJ170A-13 does not carry military qualification.