SMBJ70 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMBJ70 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 70V reverse standoff voltage with 118.65V maximum clamping voltage and 5.3A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ70 is classified as obsolete; equivalent and substitute parts listed below provide active alternatives with comparable or enhanced electrical characteristics for direct circuit replacement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	70	V
Voltage - Breakdown (Min)	73.71	V
Voltage - Clamping (Max) @ Ipp	118.65	V
Current - Peak Pulse (10/1000µs)	5.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMBJ70 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 70V nominal
Voltage - Clamping (Max) @ Ipp: Range 100V to 146V acceptable
Current - Peak Pulse (10/1000µs): 4.9A to 27A
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Unidirectional Channels: 1

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (Standard Clamping): Parts with clamping voltage 113V ± 5V, matching the original SMBJ70 electrical profile for direct replacement in general-purpose applications.

Group B (Enhanced Performance): Parts with clamping voltage 100V or 125V–146V, suitable for applications requiring lower or higher transient suppression thresholds while maintaining 70V standoff voltage and compatible package form factor.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Package / Case	Product Status	RoHS Status
SMBJ70	Littelfuse Inc.	70	118.65	5.3	DO-214AA, SMB	Obsolete	ROHS3 Compliant
P6SMB91A	Eaton - Electronics Division	77.8	125	4.9	DO-214AA, SMB	Active	RoHS Compliant
SMBJ70A	MDD	70	113	5.3	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T82AY	STMicroelectronics	70	146	27 (8/20µs)	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ70A-13-F	Diodes Incorporated	70	113	5.3	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ70A-TP	Micro Commercial Co	70	113	5.3	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ70A-TR	STMicroelectronics	70	113	5.5	DO-214AA, SMB	Active	ROHS3 Compliant
SMBT70A-13-F	Diodes Incorporated	70	100	5.3	DO-214AA, SMB	Active	ROHS3 Compliant
TV06B700J-G	Comchip Technology	70	113	5.31	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Group A - Standard Clamping):

SMBJ70A (MDD), SMBJ70A-13-F (Diodes Incorporated), SMBJ70A-TP (Micro Commercial Co), SMBJ70A-TR (STMicroelectronics), and TV06B700J-G (Comchip Technology) are direct functional equivalents with 70V standoff voltage and 113V clamping voltage. All are active products with ROHS3 compliance. These parts are suitable for general-purpose applications requiring electrical performance matching the original SMBJ70 specification.

Secondary Substitutes (Group B - Alternative Clamping):

SMBT70A-13-F (Diodes Incorporated) provides lower clamping voltage (100V) while maintaining 70V standoff and 5.3A peak pulse current. This variant is applicable in circuits where reduced transient voltage suppression is acceptable.

P6SMB91A (Eaton - Electronics Division) features elevated standoff voltage (77.8V) and clamping voltage (125V) with 4.9A peak pulse current. This part is suitable for applications requiring higher voltage suppression thresholds.

SM6T82AY (STMicroelectronics) is an automotive-grade TVS diode (AEC-Q101 qualified) with 70V standoff voltage, 146V clamping voltage, and significantly higher peak pulse current (27A at 8/20µs). This part is applicable in high-energy transient environments or automotive circuit protection where enhanced current handling is required.

All substitute parts maintain DO-214AA (SMB) package compatibility and surface-mount configuration, enabling direct PCB replacement without layout modification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ70A variants from different manufacturers be used interchangeably?

A: Yes. SMBJ70A-13-F (Diodes Incorporated), SMBJ70A-TP (Micro Commercial Co), and SMBJ70A-TR (STMicroelectronics) share identical electrical specifications (70V standoff, 113V clamping, 5.3A peak pulse) and DO-214AA package form factor. Selection may be based on packaging format (Tape & Reel, Cut Tape, or Digi-Reel) and inventory availability. Operating temperature ranges vary slightly (-55°C to 150°C for most variants; -55°C to 175°C for SMBJ70A-TP).

Q: What is the difference between SMBJ70A and SMBT70A-13-F?

A: Both parts share 70V standoff voltage, 5.3A peak pulse current, and DO-214AA package. The primary difference is clamping voltage: SMBJ70A clamps at 113V, while SMBT70A-13-F clamps at 100V. SMBT70A-13-F also specifies capacitance (290pF @ 1MHz), which is not provided for SMBJ70A. Selection depends on the maximum transient voltage your circuit can tolerate.

Q: Is SM6T82AY suitable as a direct replacement for SMBJ70?

A: SM6T82AY maintains 70V standoff voltage and DO-214AA package compatibility but differs significantly in clamping voltage (146V vs. 118.65V) and peak pulse current (27A at 8/20µs vs. 5.3A at 10/1000µs). This part is applicable only if your circuit design accommodates higher clamping voltage and benefits from enhanced current handling. SM6T82AY is automotive-grade (AEC-Q101 qualified), making it suitable for automotive applications.

Q: Does P6SMB91A work as a substitute for SMBJ70?

A: P6SMB91A differs in standoff voltage (77.8V vs. 70V) and clamping voltage (125V vs. 118.65V). While both are 600W TVS diodes in DO-214AA package, the higher standoff voltage means P6SMB91A will not trigger suppression until a higher transient threshold is reached. Use P6SMB91A only if your circuit design specifically requires 77.8V standoff voltage protection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are RoHS compliant (ROHS3 or RoHS Compliant status). The original SMBJ70 is ROHS3 compliant. All parts are also REACH unaffected or REACH compliant where specified.

Q: What packaging options are available for SMBJ70A substitutes?

A: SMBJ70A-13-F is supplied in Tape & Reel (TR) format. SMBJ70A-TP is supplied in Cut Tape (CT) format. SMBJ70A-TR is supplied in Cut Tape (CT) & Digi-Reel format. Standard SMBJ70A (MDD) packaging is not specified in the provided data. Verify packaging requirements with your procurement process before selection.

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