SMBJ40-E3/52 Equivalent & Substitute Parts

Part Overview

The SMBJ40-E3/52 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 40V reverse standoff voltage and provides transient suppression through a 71.4V clamping voltage at peak pulse current. The SMBJ40-E3/52 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across the reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current rating, and DO-214AA (SMB) package specification.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	71.4	V
Current - Peak Pulse (10/1000µs)	8.4	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-55 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ40-E3/52 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Reverse Standoff Voltage: 40V (Typ)
Breakdown Voltage (Min): 44.4V
Package Type: DO-214AA / SMB (Surface Mount)
Unidirectional Configuration: 1 Channel
Peak Pulse Power Rating: 600W
RoHS3 Compliance
MSL Rating: 1 (Unlimited)

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

Group A - Matched Clamping Voltage (71.4V): Parts with clamping voltage at or near 71.4V provide direct electrical equivalence to the original SMBJ40-E3/52 specification.

Group B - Alternative Clamping Voltage (64.5V): Parts with 64.5V clamping voltage operate within the same reverse standoff and breakdown voltage envelope but with reduced peak pulse current capability (9.3A vs. 8.4A). These remain functionally compatible for applications where the lower clamping voltage is acceptable.

Group C - Higher Performance (84V): The SM6T47AY offers elevated clamping voltage (84V) with significantly higher peak pulse current (48A at 8/20µs), suitable for applications requiring enhanced transient suppression margin.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package / Case	Product Status	Operating Temperature
SMBJ40-E3/52	Vishay General Semiconductor	40V	44.4V	71.4V	8.4A (10/1000µs)	600W	DO-214AA, SMB	Obsolete	-55 to 150°C
SMBJ40A-E3/52	Vishay General Semiconductor	40V	44.4V	64.5V	9.3A (10/1000µs)	600W	DO-214AA, SMB	Active	-55 to 150°C
SMBJ40E3/TR13	Microchip Technology	40V	44.4V	71.4V	8.4A (10/1000µs)	600W	DO-214AA, SMB	Active	-65 to 150°C
SM6T47AY	STMicroelectronics	40V	44.4V	84V	48A (8/20µs)	600W	DO-214AA, SMB	Active	-55 to 150°C
SMBJ40A	MDD	40V	44.4V	64.5V	9.3A (10/1000µs)	600W	DO-214AA, SMB	Active	-50 to 150°C
SMBJ40A-13-F	Diodes Incorporated	40V	44.4V	64.5V	9.3A (10/1000µs)	600W	DO-214AA, SMB	Active	-55 to 150°C
SMBJ40A-TP	Micro Commercial Co	40V	44.4V	64.5V	9.3A (10/1000µs)	600W	DO-214AA, SMB	Active	-55 to 175°C
SMBJ40A-TR	STMicroelectronics	40V	44.4V	64.5V	9.7A (10/1000µs)	600W	DO-214AA, SMB	Active	-55 to 150°C
TV06B400J-G	Comchip Technology	40V	44.4V	64.5V	9.3A (10/1000µs)	600W	DO-214AA, SMB	Active	Not specified

Engineering Selection Recommendations

Direct Electrical Equivalents (Matched Clamping Voltage):

SMBJ40E3/TR13 (Microchip Technology) provides the closest electrical match to the obsolete SMBJ40-E3/52, maintaining identical clamping voltage (71.4V) and peak pulse current (8.4A). This part is in active production status with ROHS3 compliance and extended operating temperature range (-65 to 150°C). The extended lower temperature limit provides additional design margin for harsh environments.

Primary Active Substitutes (Reduced Clamping Voltage):

SMBJ40A-E3/52 (Vishay General Semiconductor) is the manufacturer's direct successor, offering active production status with the same packaging and temperature range as the original. The 64.5V clamping voltage represents a 10% reduction from the original specification, with compensating 9.3A peak pulse current (versus 8.4A).

SMBJ40A-13-F (Diodes Incorporated) and SMBJ40A-TP (Micro Commercial Co) provide alternative sources for the 64.5V clamping specification with full ROHS3 compliance. SMBJ40A-TP extends the upper operating temperature to 175°C, suitable for high-temperature applications.

SMBJ40A-TR (STMicroelectronics) offers 64.5V clamping with marginally higher peak pulse current (9.7A) and TRANSIL™ series designation, maintaining full compliance across all regulatory requirements.

Enhanced Performance Alternative:

SM6T47AY (STMicroelectronics) provides elevated clamping voltage (84V) with significantly higher peak pulse current capability (48A at 8/20µs). This part carries AEC-Q101 automotive qualification and is suitable for applications requiring enhanced transient suppression margin or automotive-grade reliability.

All substitute parts maintain the critical 40V reverse standoff voltage, 44.4V minimum breakdown voltage, DO-214AA package specification, 600W peak pulse power rating, ROHS3 compliance, and MSL 1 rating required for functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMBJ40A-E3/52 directly replace SMBJ40-E3/52 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (40V), breakdown voltage (44.4V), package type (DO-214AA/SMB), and power rating (600W). The 64.5V clamping voltage in SMBJ40A-E3/52 is 10% lower than the original 71.4V specification, but remains within the same functional envelope. Designs must be evaluated to confirm the lower clamping voltage is acceptable for the application's transient suppression requirements.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform (used by Vishay, Microchip, and most SMBJ series parts) defines peak pulse current under a specific transient profile. The 8/20µs waveform (used by STMicroelectronics SM6T47AY) represents a different transient profile, typically associated with lightning surge testing. Peak pulse current values are not directly comparable across different waveform specifications.

Q: Is SMBJ40E3/TR13 from Microchip a true equivalent to the Vishay SMBJ40-E3/52?

A: SMBJ40E3/TR13 matches the electrical specifications exactly: 40V reverse standoff, 44.4V breakdown, 71.4V clamping, and 8.4A peak pulse current. Both use the DO-214AA package and 600W power rating. The Microchip part is in active production with extended temperature range (-65 to 150°C versus -55 to 150°C), making it a direct functional replacement.

Q: Why does SM6T47AY have significantly higher peak pulse current (48A)?

A: SM6T47AY uses a different pulse waveform specification (8/20µs versus 10/1000µs), which results in higher measured peak pulse current under that specific test condition. The 600W peak pulse power rating remains identical. This part is suitable for applications requiring enhanced transient suppression capability or automotive-grade reliability (AEC-Q101 qualified).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ40-E3/52 environmental specifications.

Q: What is the impact of operating temperature range differences?

A: SMBJ40E3/TR13 extends the lower operating limit to -65°C (versus -55°C standard), providing additional design margin for cold-environment applications. SMBJ40A-TP extends the upper limit to 175°C (versus 150°C standard), suitable for high-temperature environments. These differences do not affect electrical performance within the specified ranges.

Q: Can parts with different clamping voltages be mixed in the same circuit?

A: No. Mixing parts with different clamping voltages (71.4V versus 64.5V versus 84V) in parallel or series configurations will result in uneven transient voltage distribution and compromised protection. Select a single clamping voltage specification for all TVS diodes in a given protection circuit.

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