SMBJ40A-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ40A-E3/5B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 40V reverse standoff category and is designed for general-purpose transient protection applications. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V
Current - Peak Pulse (10/1000µs)	9.3A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ40A-E3/5B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 40V
Voltage - Clamping (Max) @ Ipp: 64.5V (±tolerance acceptable)
Current - Peak Pulse (10/1000µs): 9.3A (±tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Operating Temperature Range: -55°C minimum to 150°C minimum

Substitute parts must maintain identical reverse standoff voltage and package form factor. Clamping voltage and peak pulse current may vary within manufacturer tolerances. All substitutes must support the full operating temperature range or exceed it. RoHS3 compliance and MSL 1 rating are standard across all listed alternatives.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package
SMBJ40A-E3/5B	Vishay General Semiconductor	40V	64.5V	9.3A	600W	-55°C ~ 150°C	DO-214AA, SMB
SMBJ40D-M3/I	Vishay General Semiconductor	40V	63.6V	9.43A	600W	-55°C ~ 150°C	DO-214AA, SMB
ATV06B400J-HF	Comchip Technology	40V	64.5V	9.3A	600W	-55°C ~ 150°C	DO-214AA, SMB
SMBJ40A	MDD	40V	64.5V	9.3A	600W	-50°C ~ 150°C	DO-214AA, SMB
SMBJ40A-13-F	Diodes Incorporated	40V	64.5V	9.3A	600W	-55°C ~ 150°C	DO-214AA, SMB
SMBJ40A-TP	Micro Commercial Co	40V	64.5V	9.3A	600W	-55°C ~ 175°C	DO-214AA, SMB
SM6T47AY	STMicroelectronics	40V	84V	48A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB
SMBJ40A-TR	STMicroelectronics	40V	64.5V	9.7A	600W	-55°C ~ 150°C	DO-214AA, SMB

Engineering Selection Recommendations

Direct substitutes with identical electrical performance and operating temperature range include SMBJ40D-M3/I (Vishay), ATV06B400J-HF (Comchip Technology), SMBJ40A-13-F (Diodes Incorporated), and SMBJ40A-TR (STMicroelectronics). These parts maintain 40V reverse standoff voltage, 64.5V clamping voltage, and -55°C to 150°C operating range. All are RoHS3 compliant with MSL 1 rating.

SMBJ40A (MDD) is electrically equivalent but operates to -50°C minimum, which is acceptable for applications not requiring -55°C performance. SMBJ40A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, providing additional thermal margin for high-temperature environments.

SM6T47AY (STMicroelectronics) is not a direct substitute. While it maintains the 40V reverse standoff voltage and DO-214AA package, it specifies 84V clamping voltage and 48A peak pulse current (8/20µs pulse definition), representing a different performance class. This part is suitable only for applications requiring higher clamping voltage and current handling.

All listed substitutes are active production parts with full compliance documentation available.

Frequently Asked Questions (FAQ)

Q: Can SMBJ40A-E3/5B be replaced with SM6T47AY?

A: No. While both are 40V reverse standoff TVS diodes in DO-214AA package, SM6T47AY specifies 84V clamping voltage and 48A peak pulse current versus 64.5V and 9.3A for SMBJ40A-E3/5B. This represents a different protection class and will alter circuit behavior. Use SM6T47AY only if your application specifically requires higher clamping voltage and current capacity.

Q: Are all substitute parts pin-compatible?

A: Yes. All listed substitutes use the DO-214AA (SMB) package with identical pinout and footprint. No PCB layout changes are required for direct substitution among SMBJ40D-M3/I, ATV06B400J-HF, SMBJ40A-13-F, SMBJ40A-TP, and SMBJ40A-TR.

Q: What is the difference between SMBJ40A-E3/5B and SMBJ40D-M3/I?

A: Both are Vishay TransZorb TVS diodes with 40V reverse standoff. SMBJ40D-M3/I specifies 63.6V clamping voltage and 9.43A peak pulse current versus 64.5V and 9.3A for SMBJ40A-E3/5B. These differences fall within normal manufacturing tolerance bands and do not affect functional substitution.

Q: Does operating temperature range affect substitution?

A: Operating temperature range affects substitution only if your application requires the full -55°C to 150°C range. SMBJ40A (MDD) operates to -50°C minimum, which is acceptable for applications with -50°C or higher minimum temperature requirements. SMBJ40A-TP extends to 175°C maximum, providing additional margin for high-temperature circuits.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating, matching the compliance profile of SMBJ40A-E3/5B.

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