SMBJ70-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ70-E3/5B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 70V reverse standoff voltage and provides 125V maximum clamping voltage at peak pulse current. The device is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	70V
Breakdown Voltage (Min)	77.8V
Clamping Voltage (Max) @ Ipp	125V
Peak Pulse Current (10/1000µs)	4.8A
Peak Pulse Power	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution validity for the SMBJ70-E3/5B is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 70V (all substitutes maintain this specification)
Breakdown Voltage (Min): Must be 77.8V (all substitutes maintain this specification)
Package / Case: Must be DO-214AA or SMB (all substitutes use this package)
Mounting Type: Must be Surface Mount (all substitutes are surface mount)
Clamping Voltage @ Ipp: Acceptable range 100V–146V (substitutes vary within this range)
Peak Pulse Current: Acceptable range 4.8A–27A (substitutes vary within this range)
Operating Temperature: Minimum -55°C, maximum 150°C (substitutes meet or exceed this range)
RoHS & Compliance: All substitutes maintain ROHS3 compliance and MSL 1 rating

Substitutes are grouped by clamping voltage performance: lower-clamp variants (100V), mid-clamp variants (113V), and higher-clamp variants (125V–146V). Selection depends on circuit protection requirements and thermal dissipation capacity.

Parameter Comparison

Part Number	Manufacturer	Clamping Voltage (Max) @ Ipp	Peak Pulse Current (10/1000µs)	Operating Temperature	Product Status	Packaging
SMBJ70-E3/5B	Vishay General Semiconductor	125V	4.8A	-55°C ~ 150°C	Obsolete	DO-214AA (SMBJ)
SMBJ70A-E3/5B	Vishay General Semiconductor	113V	5.3A	-55°C ~ 150°C	Active	DO-214AA (SMBJ), Tape & Reel
SMBJ70E3/TR13	Microchip Technology	125V	4.8A	-65°C ~ 150°C	Active	SMBJ (DO-214AA), Tape & Reel
SM6T82AY	STMicroelectronics	146V	27A (8/20µs)	-55°C ~ 150°C	Active	SMB (DO-214AA), Tape & Reel
SMBJ70A	MDD	113V	5.3A	-50°C ~ 150°C	Active	SMB/DO-214AA
SMBJ70A-13-F	Diodes Incorporated	113V	5.3A	-55°C ~ 150°C	Active	SMB, Tape & Reel
SMBJ70A-TP	Micro Commercial Co	113V	5.3A	-55°C ~ 175°C	Active	DO-214AA (SMB), Cut Tape
SMBJ70A-TR	STMicroelectronics	113V	5.5A	-55°C ~ 150°C	Active	SMB (DO-214AA), Cut Tape & Digi-Reel
SMBT70A-13-F	Diodes Incorporated	100V	5.3A	-55°C ~ 150°C	Active	SMB, Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Clamping Voltage)

SMBJ70E3/TR13 (Microchip Technology) and SMBJ70-E3/5B share identical clamping voltage (125V) and peak pulse current (4.8A) specifications. SMBJ70E3/TR13 is active and available in tape & reel packaging, making it the primary direct replacement for the obsolete Vishay part. Operating temperature range extends to -65°C, providing enhanced low-temperature performance.

Performance-Equivalent Alternatives (Mid-Range Clamping)

SMBJ70A-E3/5B (Vishay), SMBJ70A-13-F (Diodes Incorporated), SMBJ70A-TP (Micro Commercial Co), SMBJ70A-TR (STMicroelectronics), and SMBJ70A (MDD) all deliver 113V clamping voltage with 5.3A–5.5A peak pulse current. These parts are active, ROHS3 compliant, and available in multiple packaging formats. The 12V reduction in clamping voltage is acceptable for applications where the original 125V specification provides design margin. SMBJ70A-TP offers extended operating temperature to 175°C.

Lower-Clamp Alternative (Reduced Clamping Voltage)

SMBT70A-13-F (Diodes Incorporated) provides 100V clamping voltage with 5.3A peak pulse current. This variant is suitable only for applications where lower clamping voltage is acceptable or beneficial for reduced transient energy dissipation. Capacitance specification (290pF @ 1MHz) is provided for this part.

Higher-Performance Alternative (Elevated Clamping Voltage)

SM6T82AY (STMicroelectronics) delivers 146V clamping voltage with significantly elevated peak pulse current (27A at 8/20µs pulse). This automotive-grade part (AEC-Q101 qualified) is appropriate for high-energy transient environments requiring superior current handling. The higher clamping voltage may require circuit re-evaluation in sensitive applications.

All recommended substitutes maintain DO-214AA/SMB package compatibility, surface-mount configuration, ROHS3 compliance, and MSL 1 rating. Selection should be based on specific circuit protection requirements, available design margin, and thermal dissipation capacity.

Frequently Asked Questions (FAQ)

Q: Can SMBJ70A-E3/5B replace SMBJ70-E3/5B directly?

A: Yes. Both parts share identical reverse standoff voltage (70V) and breakdown voltage (77.8V). The clamping voltage differs by 12V (113V vs. 125V), which is acceptable if circuit design includes sufficient margin above the 113V threshold. SMBJ70A-E3/5B is active and available in tape & reel packaging.

Q: What is the difference between SMBJ70E3/TR13 and SMBJ70-E3/5B?

A: SMBJ70E3/TR13 (Microchip) and SMBJ70-E3/5B (Vishay) are electrically identical: both specify 125V clamping voltage and 4.8A peak pulse current. SMBJ70E3/TR13 is active and available in tape & reel format. Operating temperature range extends to -65°C on the Microchip part versus -55°C on the Vishay part.

Q: Why do substitute parts have different clamping voltages?

A: Clamping voltage variation (100V–146V) reflects different design approaches by manufacturers while maintaining the same 70V reverse standoff specification. Lower clamping voltages reduce transient energy but may provide less protection margin. Higher clamping voltages increase protection margin but dissipate more energy. Selection depends on circuit requirements and available thermal budget.

Q: Are all substitute parts available in the same package?

A: Yes. All substitutes use DO-214AA or SMB package designation, which are mechanically and electrically equivalent. Packaging format (tape & reel, cut tape, or bulk) varies by manufacturer and supplier. Verify packaging availability with your distributor for production requirements.

Q: Is SM6T82AY suitable as a direct replacement?

A: SM6T82AY is electrically compatible but not a direct replacement. It specifies 146V clamping voltage (21V higher than the original) and 27A peak pulse current (5.6× higher). This part is appropriate only for applications requiring enhanced transient protection and higher current handling. Circuit re-evaluation is necessary before substitution.

Q: Do all substitutes meet RoHS and MSL requirements?

A: Yes. All listed substitutes are ROHS3 compliant and rated MSL 1 (Unlimited moisture sensitivity level), matching the original SMBJ70-E3/5B specifications.

Q: Which substitute offers the widest operating temperature range?

A: SMBJ70A-TP (Micro Commercial Co) specifies -55°C to 175°C operating temperature, extending 25°C above standard specifications. This part is suitable for high-temperature applications.

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