SMBJ170 Equivalent & Substitute Parts

Part Overview

The SMBJ170 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 170V reverse standoff voltage with a 288.75V maximum clamping voltage and 2.2A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ170 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	179.1V
Voltage - Clamping (Max) @ Ipp	288.75V
Current - Peak Pulse (10/1000µs)	2.2A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C (TJ)
Type	Zener
Unidirectional Channels	1
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMBJ170 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 170V (exact match required)
Voltage - Clamping (Max) @ Ipp: Must not exceed 288.75V to maintain circuit protection integrity
Current - Peak Pulse (10/1000µs): 2.2A minimum
Power - Peak Pulse: 600W minimum

Mechanical Compatibility Criteria:

Package / Case: DO-214AA, SMB (surface-mount form factor)
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener diode

Compliance Requirements:

RoHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts meeting all these parameters are electrically and mechanically interchangeable with the SMBJ170 in circuit applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	RoHS Status
SMBJ170	Littelfuse Inc.	Obsolete	170V	179.1V	288.75V	2.2A	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3 Compliant
SMBJ170A	Fairchild Semiconductor	Active	170V	189V	275V	2.2A	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant
SMBJ170A-13-F	Diodes Incorporated	Active	170V	189V	275V	2.2A	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant
SMBJ170A-E3/52	Vishay General Semiconductor - Diodes Division	Active	170V	189V	275V	2.2A	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant
SMBJ170A-TR	STMicroelectronics	Active	170V	189V	275V	2.2A	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant
TV06B171J-G	Comchip Technology	Active	170V	189V	275V	2.18A	600W	DO-214AA, SMB	Not specified	ROHS3 Compliant
TV06B171J-HF	Comchip Technology	Active	170V	189V	275V	2.18A	600W	DO-214AA, SMB	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

SMBJ170A variants from Fairchild Semiconductor, Diodes Incorporated, Vishay General Semiconductor, and STMicroelectronics are active products with full production support. These parts maintain the 170V reverse standoff voltage and 2.2A peak pulse current specification. The clamping voltage of 275V is lower than the original SMBJ170 (288.75V), providing enhanced protection margins. All primary substitutes are ROHS3 compliant with MSL 1 rating and support the full -55°C to 150°C operating temperature range.

Alternative Substitutes (Comchip Technology):

TV06B171J-G and TV06B171J-HF from Comchip Technology meet the electrical and mechanical requirements with 275V clamping voltage and 2.18A peak pulse current. These parts are ROHS3 compliant and MSL 1 rated. Operating temperature specifications are not provided in the available data. These alternatives are suitable for applications where Comchip sourcing is preferred or where supply chain diversification is required.

Procurement Considerations:

All substitute parts are currently in active production status with confirmed inventory availability. Selection should prioritize parts with specified operating temperature ranges for applications requiring full temperature specification documentation.

Frequently Asked Questions (FAQ)

Q: Can SMBJ170A variants be used as direct replacements for the obsolete SMBJ170?

A: Yes. SMBJ170A variants from Fairchild Semiconductor, Diodes Incorporated, Vishay General Semiconductor, and STMicroelectronics are electrically and mechanically compatible. All maintain the 170V reverse standoff voltage, 2.2A peak pulse current, and DO-214AA (SMB) package. The lower clamping voltage (275V vs. 288.75V) provides improved protection performance.

Q: What is the difference between SMBJ170A and TV06B171J variants?

A: Both part families meet the core electrical specifications (170V standoff, 275V clamping, 600W peak power). SMBJ170A variants specify -55°C to 150°C operating temperature, while TV06B171J variants do not provide operating temperature data. Peak pulse current differs slightly: SMBJ170A at 2.2A versus TV06B171J at 2.18A. Both are ROHS3 compliant and MSL 1 rated.

Q: Are packaging and mounting considerations identical across all substitutes?

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package with identical pin configuration and footprint. No PCB layout modifications are required when substituting between listed parts.

Q: Which substitute offers the best supply chain availability?

A: SMBJ170A from Fairchild Semiconductor shows the highest inventory level at 17,300 pieces. SMBJ170A-13-F from Diodes Incorporated (10,200 pieces) and SMBJ170A-TR from STMicroelectronics (5,200 pieces) also provide substantial stock. Comchip Technology variants (TV06B171J-G and TV06B171J-HF) have lower inventory levels at 723 and 870 pieces respectively.

Q: Do all substitutes meet RoHS3 compliance requirements?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ170 specification.

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