SMCJ170A-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ170A-M3/9AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component in DO-214AB (SMC) package is designed for general-purpose transient voltage protection applications. The part is Active status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	189V
Voltage - Clamping (Max) @ Ipp	275V
Current - Peak Pulse (10/1000µs)	5.5A
Power - Peak Pulse	1500W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the SMCJ170A-M3/9AT are grouped based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff (Typ): 170V
Voltage - Breakdown (Min): 189V
Voltage - Clamping (Max) @ Ipp: 275V
Current - Peak Pulse (10/1000µs): 5.5A
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 Channel)

Parts are classified into two categories:

Category A - Direct Electrical Equivalents (275V Clamp, 5.5A Ipp, 1500W): These parts match all critical electrical parameters and package specifications of the main part.

Category B - Higher Performance Alternatives (275V Clamp, Higher Ipp/Power): These parts maintain the same voltage specifications but provide increased current handling or power dissipation capability, suitable for applications requiring enhanced transient protection margin.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
SMCJ170A-M3/9AT	Vishay General Semiconductor - Diodes Division	170V	189V	275V	5.5A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMCJ170A-E3/57T	Vishay General Semiconductor - Diodes Division	170V	189V	275V	5.5A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMCJ170A	Fairchild Semiconductor	170V	189V	275V	5.5A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMCJ170A-13-F	Diodes Incorporated	170V	189V	275V	5.5A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMCJ170A-TP	Micro Commercial Co	170V	189V	275V	5.5A	1500W	-55°C ~ 175°C	DO-214AB, SMC	Active
SMDJ170A	Alpha & Omega Semiconductor Inc.	170V	189V	275V	11A	3000W	-55°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ170A	MDE Semiconductor Inc	170V	189V	275V	18.2A	5000W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMCJ170A-TR	STMicroelectronics	170V	189V	353V	28A (8/20µs)	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance):

SMCJ170A-E3/57T, SMCJ170A (Fairchild), SMCJ170A-13-F, and SMCJ170A-TP are direct electrical equivalents with matching voltage and current specifications. All are Active status and RoHS3 compliant. SMCJ170A-TP offers extended operating temperature range to 175°C. Selection among these parts depends on packaging format availability (Tape & Reel vs. Bulk) and supply chain requirements.

Higher Performance Alternatives:

SMDJ170A provides doubled peak pulse current (11A) and power dissipation (3000W) while maintaining identical voltage specifications and package form factor. This part is suitable for applications requiring enhanced transient protection margin without circuit redesign.

5.0SMDJ170A offers the highest performance with 18.2A peak pulse current and 5000W power dissipation. This part is recommended for high-energy transient environments where additional protection headroom is required.

SMCJ170A-TR (STMicroelectronics) features elevated clamping voltage (353V) and significantly higher peak pulse current (28A). This part is suitable only for applications where the higher clamping voltage is acceptable and additional current handling capability is required.

All substitute parts maintain Active product status and RoHS3 compliance, supporting long-term design continuity.

Frequently Asked Questions (FAQ)

Q: Can SMCJ170A-E3/57T be used as a direct replacement for SMCJ170A-M3/9AT?

A: Yes. Both parts share identical electrical specifications (170V standoff, 189V breakdown, 275V clamp, 5.5A peak pulse, 1500W power) and DO-214AB SMC package. The difference is packaging format: SMCJ170A-E3/57T is supplied in Tape & Reel while SMCJ170A-M3/9AT is supplied in Tape & Reel. Both are Vishay products with Active status and RoHS3 compliance.

Q: What is the difference between SMCJ170A and SMDJ170A?

A: Both maintain identical voltage specifications (170V standoff, 189V breakdown, 275V clamp) and DO-214AB SMC package. SMDJ170A provides higher current handling (11A vs. 5.5A) and power dissipation (3000W vs. 1500W). SMDJ170A is suitable for applications requiring enhanced transient protection without changing the circuit board layout.

Q: Can 5.0SMDJ170A be used in place of SMCJ170A-M3/9AT?

A: Yes, with consideration for application requirements. 5.0SMDJ170A maintains identical voltage specifications and package form factor but provides significantly higher peak pulse current (18.2A vs. 5.5A) and power dissipation (5000W vs. 1500W). This part is suitable for high-energy transient environments where additional protection margin is beneficial.

Q: Why does SMCJ170A-TR have different clamping voltage (353V vs. 275V)?

A: SMCJ170A-TR from STMicroelectronics is a higher-performance variant with elevated clamping voltage and significantly higher peak pulse current (28A). This part is suitable only for applications where the higher clamping voltage specification is acceptable and additional current handling is required. It is not a direct substitute for standard 275V clamping applications.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant and Active status, supporting regulatory compliance and long-term supply availability.

Q: What packaging formats are available for SMCJ170A equivalents?

A: Substitute parts are available in Tape & Reel (TR) and Bulk packaging formats. SMCJ170A-E3/57T, SMCJ170A-13-F, SMCJ170A-TP, SMDJ170A, 5.0SMDJ170A, and SMCJ170A-TR are supplied in Tape & Reel. Fairchild SMCJ170A is supplied in Bulk. Selection depends on manufacturing process requirements and supply chain specifications.

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