SMBJ170C Equivalent & Substitute Parts

Part Overview

The SMBJ170C 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, 288.75V maximum clamping voltage, and 2.2A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ170C is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	170	V
Voltage - Breakdown (Min)	179.1	V
Voltage - Clamping (Max) @ Ipp	288.75	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	-65°C ~ 150°C	TJ
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ170C are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 170V
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Type: Zener, Bidirectional
Bidirectional Channels: 1

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 275V to 304V (original: 288.75V)
Current - Peak Pulse (10/1000µs): 2.0A to 2.2A (original: 2.2A)
Voltage - Breakdown (Min): 179.1V to 189V (original: 179.1V)
Operating Temperature: -55°C to -65°C minimum; 150°C to 175°C maximum (original: -65°C ~ 150°C)
Power - Peak Pulse: 600W (maintained across all substitutes)

Substitute parts meeting these criteria maintain functional equivalence for transient voltage suppression applications while accommodating minor variations in clamping voltage and peak pulse current within acceptable engineering tolerances.

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 / Case	Product Status
SMBJ170C	Littelfuse Inc.	170V	179.1V	288.75V	2.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Obsolete
SMBJ170CA	Meritek	170V	189V	275V	2.18A	600W	-55°C ~ 150°C	DO-214AA (SMB)	Active
SMBJ170CA-13-F	Diodes Incorporated	170V	189V	275V	2.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJ170CA-TP	Micro Commercial Co	170V	189V	275V	2.2A	600W	-55°C ~ 175°C	DO-214AA, SMB	Active
SMBJ170CA-TR	STMicroelectronics	170V	189V	275V	2.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJ170CE3/TR13	Microchip Technology	170V	189V	304V	2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
TV06B171JB-G	Comchip Technology	170V	189V	275V	2.18A	600W	Not specified	DO-214AA, SMB	Active
TV06B171JB-HF	Comchip Technology	170V	189V	275V	2.18A	600W	Not specified	DO-214AA, SMB	Active

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ170C specifications. Selection among substitutes should be based on the following criteria:

Primary Recommendation: SMBJ170CA-TR (STMicroelectronics) and SMBJ170CA-13-F (Diodes Incorporated) provide the closest electrical match with 2.2A peak pulse current, matching the original specification exactly. Both maintain 275V clamping voltage and are available in high inventory quantities.

Extended Temperature Range Option: SMBJ170CA-TP (Micro Commercial Co) extends the maximum operating temperature to 175°C, providing additional thermal margin for applications requiring higher temperature performance.

Alternative Clamping Voltage: SMBJ170CE3/TR13 (Microchip Technology) offers 304V maximum clamping voltage with 2A peak pulse current and maintains the original -65°C minimum operating temperature, suitable for applications requiring higher voltage suppression.

Cross-Manufacturer Options: SMBJ170CA (Meritek) and TV06B171JB-G / TV06B171JB-HF (Comchip Technology) provide functionally equivalent alternatives with 275V clamping and 2.18A peak pulse current, with the latter offering different packaging variants.

All substitutes maintain DO-214AA (SMB) surface-mount package compatibility, ensuring direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can SMBJ170CA directly replace SMBJ170C? A: Yes. SMBJ170CA maintains the critical 170V reverse standoff voltage and DO-214AA package. The clamping voltage is 275V versus the original 288.75V, and peak pulse current is 2.18A versus 2.2A. These variations fall within acceptable engineering tolerances for transient voltage suppression applications.

Q: What is the difference between SMBJ170CA variants (SMBJ170CA-13-F, SMBJ170CA-TP, SMBJ170CA-TR)? A: These represent the same electrical part (SMBJ170CA) from different manufacturers with different packaging and tape configurations. SMBJ170CA-13-F is from Diodes Incorporated, SMBJ170CA-TP from Micro Commercial Co, and SMBJ170CA-TR from STMicroelectronics. SMBJ170CA-TP offers extended temperature range to 175°C. Selection depends on supplier availability and packaging requirements (Tape & Reel vs. Cut Tape).

Q: Why does SMBJ170CE3/TR13 have higher clamping voltage (304V)? A: SMBJ170CE3/TR13 is a variant with different internal design specifications. While it maintains the 170V reverse standoff voltage and DO-214AA package, the higher clamping voltage (304V) and lower peak pulse current (2A) make it suitable for applications requiring higher voltage suppression but with lower current handling requirements.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ170C environmental specifications.

Q: Can I use TV06B171JB-G or TV06B171JB-HF as direct replacements? A: Yes. Both Comchip Technology parts maintain 170V reverse standoff voltage, 275V clamping voltage, and DO-214AA package. The -G and -HF designations indicate different tape configurations. Operating temperature specifications are not provided for these parts; confirm thermal requirements with the manufacturer if operating near temperature extremes.

Q: What is the impact of using 2.18A instead of 2.2A peak pulse current? A: The 2.18A specification is within 0.9% of the original 2.2A, representing negligible practical difference for general-purpose transient voltage suppression. Both values deliver equivalent protection performance in standard applications.

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