MASMBJ170AE3 Equivalent & Substitute Parts

Part Overview

The MASMBJ170AE3 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. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, design flexibility, or component lifecycle management.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	170	V
Voltage - Breakdown (Min)	189	V
Voltage - Clamping (Max) @ Ipp	275	V
Current - Peak Pulse (10/1000µs)	2.2	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C to 150°C	TJ
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the MASMBJ170AE3 is based on electrical parameter equivalence and mechanical compatibility. The following criteria determine valid substitutes:

Electrical Equivalence Requirements:

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 (1 channel)

Mechanical Compatibility Requirements:

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

Application Compatibility:

General Purpose overvoltage protection
No power line protection requirement

Substitute parts must satisfy all electrical parameters within the specified tolerances and maintain surface-mount compatibility in the SMB package family.

Parameter Comparison

Parameter	MASMBJ170AE3 (Microchip)	SMBJ170A-13 (Diodes Inc.)	Match Status
Voltage - Reverse Standoff (Typ)	170V	170V	Equivalent
Voltage - Breakdown (Min)	189V	189V	Equivalent
Voltage - Clamping (Max) @ Ipp	275V	275V	Equivalent
Current - Peak Pulse (10/1000µs)	2.2A	2.2A	Equivalent
Power - Peak Pulse	600W	600W	Equivalent
Type	Zener	Zener	Equivalent
Unidirectional Channels	1	1	Equivalent
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature Range	-65°C to 150°C	-55°C to 150°C	Partial Match
RoHS Status	RoHS non-compliant	RoHS non-compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

MASMBJ170AE3 (Microchip Technology)

The MASMBJ170AE3 is the primary reference component with active product status and military-grade qualification per MIL-PRF-19500. This part is suitable for applications requiring military-specification compliance and extended low-temperature operation down to -65°C. Current inventory of 919 pieces supports immediate availability.

SMBJ170A-13 (Diodes Incorporated)

The SMBJ170A-13 provides electrical equivalence across all critical TVS parameters and maintains mechanical compatibility in the SMB package. However, this part is discontinued at DiGi Electronics and features a reduced operating temperature range of -55°C to 150°C compared to the primary part. The SMBJ170A-13 is suitable for applications where the lower temperature limit of -55°C is acceptable and military qualification is not required. Current inventory of 874 pieces is available.

Selection Basis:

Both parts are RoHS non-compliant and REACH unaffected, maintaining equivalent regulatory status
Both parts feature MSL 1 (Unlimited) moisture sensitivity classification
Electrical performance is identical across voltage, current, and power specifications
Package and mounting compatibility is confirmed for both surface-mount implementations
Temperature range difference is the primary technical distinction; applications operating below -55°C require the MASMBJ170AE3

Frequently Asked Questions (FAQ)

Q: Can the SMBJ170A-13 replace the MASMBJ170AE3 in all applications?

A: The SMBJ170A-13 provides electrical equivalence for all TVS protection parameters. However, the operating temperature range differs: SMBJ170A-13 operates from -55°C to 150°C, while MASMBJ170AE3 operates from -65°C to 150°C. Applications requiring operation below -55°C junction temperature must use the MASMBJ170AE3.

Q: Are there package compatibility concerns between these parts?

A: Both parts use the DO-214AA (SMB) surface-mount package. Mechanical footprint and land pattern compatibility are confirmed. No PCB redesign is required for substitution.

Q: What is the significance of the military qualification on the MASMBJ170AE3?

A: The MASMBJ170AE3 carries MIL-PRF-19500 qualification, indicating compliance with military performance and reliability standards. The SMBJ170A-13 does not carry this qualification. Applications requiring military-specification components must use the MASMBJ170AE3.

Q: Why is the SMBJ170A-13 discontinued at DiGi Electronics?

A: Product discontinuation is a supplier-level decision and does not reflect component performance or reliability. The SMBJ170A-13 remains electrically and mechanically equivalent to the MASMBJ170AE3 for applications within its specified operating range.

Q: Do these parts have identical clamping voltage performance?

A: Yes. Both parts specify a maximum clamping voltage of 275V at peak pulse current (Ipp) of 2.2A. Transient voltage suppression performance is equivalent.

Q: Are there RoHS compliance differences between these parts?

A: Both parts are RoHS non-compliant with identical regulatory status. No compliance advantage exists between the two options.

Q: What is the peak pulse power rating for both parts?

A: Both the MASMBJ170AE3 and SMBJ170A-13 are rated for 600W peak pulse power dissipation, providing equivalent transient energy absorption capability.

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