SMBJ70C-E3/52 Equivalent & Substitute Parts

Part Overview

The SMBJ70C-E3/52 is a 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 125V maximum clamping voltage, delivering 4.8A peak pulse current in a DO-214AA (SMB) package. The SMBJ70C-E3/52 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMBJ70C-E3/52
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	70V
Voltage - Breakdown (Min)	77.8V
Voltage - Clamping (Max) @ Ipp	125V
Current - Peak Pulse (10/1000µs)	4.8A
Power - Peak Pulse	600W
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SMBJ70C-E3/52 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 70V
Voltage - Breakdown (Min): 77.8V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener
RoHS Status: ROHS3 Compliant

Substitute parts must maintain identical reverse standoff voltage (70V) and breakdown voltage (77.8V) to ensure proper circuit protection. The DO-214AA SMB package is mandatory for mechanical and electrical compatibility. All substitutes listed are ROHS3 compliant surface-mount Zener TVS diodes with single bidirectional channels.

Variations in clamping voltage (113V to 146V) and peak pulse current (4.8A to 27A) are acceptable within the substitute group, as these parameters define the protection characteristics rather than the fundamental compatibility. Operating temperature ranges may vary between -55°C to -65°C minimum and 150°C to 175°C maximum, all within acceptable industrial specifications.

Parameter Comparison

Parameter	SMBJ70C-E3/52 (Main)	SMBJ70CA-E3/52	SMBJ70CE3/TR13	SM6T82CAY	SMBJ70CA	SMBJ70CA-13-F	SMBJ70CA-TP	SMBJ70CA-TR	SMBJ70CAE3/TR13
Manufacturer	Vishay	Vishay	Microchip	STMicroelectronics	Semtech	Diodes Inc.	Micro Commercial Co	STMicroelectronics	Microchip
Voltage - Reverse Standoff (Typ)	70V	70V	70V	70V	70V	70V	70V	70V	70V
Voltage - Breakdown (Min)	77.8V	77.8V	77.8V	77.8V	77.8V	77.8V	77.8V	77.8V	77.8V
Voltage - Clamping (Max) @ Ipp	125V	113V	125V	146V	113V	113V	113V	113V	113V
Current - Peak Pulse (10/1000µs)	4.8A	5.3A	4.8A	27A (8/20µs)	5.3A	5.3A	5.3A	5.5A	5.3A
Power - Peak Pulse	600W	600W	600W	600W	600W	600W	600W	600W	600W
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain active product status with ROHS3 compliance, ensuring long-term availability and regulatory adherence. The SMBJ70C-E3/52 is obsolete, making substitution necessary for new designs and ongoing production.

For direct electrical equivalence with identical clamping voltage (125V) and peak pulse current (4.8A), select SMBJ70CE3/TR13 from Microchip Technology. This part provides the closest match to the original specification while maintaining active status.

For applications where slightly higher peak pulse current (5.3A to 5.5A) is acceptable with reduced clamping voltage (113V), multiple active alternatives are available: SMBJ70CA-E3/52 (Vishay), SMBJ70CA (Semtech), SMBJ70CA-13-F (Diodes Incorporated), SMBJ70CA-TP (Micro Commercial Co), SMBJ70CA-TR (STMicroelectronics), and SMBJ70CAE3/TR13 (Microchip). These parts offer superior availability and extended operating temperature ranges in some variants.

For applications requiring higher peak pulse current capability (27A at 8/20µs pulse), SM6T82CAY from STMicroelectronics provides automotive-grade qualification (AEC-Q101) with 146V clamping voltage, suitable for demanding industrial and automotive protection circuits.

Frequently Asked Questions (FAQ)

Q: Can I substitute SMBJ70CA-E3/52 for SMBJ70C-E3/52 directly?

A: Yes. Both parts share identical reverse standoff voltage (70V), breakdown voltage (77.8V), and DO-214AA SMB package. SMBJ70CA-E3/52 has slightly higher peak pulse current (5.3A vs 4.8A) and lower clamping voltage (113V vs 125V), making it suitable for most general-purpose protection applications. SMBJ70CA-E3/52 is active status, ensuring continued availability.

Q: What is the difference between 113V and 125V clamping voltage?

A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. Lower clamping voltage (113V) provides tighter protection but may trigger more frequently. Higher clamping voltage (125V) allows slightly higher transient peaks. Selection depends on the protected circuit's tolerance to overvoltage. Both values are within the 70V reverse standoff specification.

Q: Are all substitute parts in DO-214AA SMB package?

A: Yes. All listed substitutes use DO-214AA SMB surface-mount package, ensuring mechanical and electrical compatibility with the original SMBJ70C-E3/52 footprint.

Q: Why does SM6T82CAY have 27A peak pulse current instead of 4.8A?

A: SM6T82CAY is a higher-performance variant designed for applications requiring greater transient current handling. The 27A rating (8/20µs pulse) differs from the 4.8A rating (10/1000µs pulse) due to different pulse waveform specifications. SM6T82CAY is suitable only if your circuit can tolerate 146V clamping voltage and requires automotive-grade qualification.

Q: What does ROHS3 Compliant mean?

A: ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes are ROHS3 compliant, ensuring regulatory compliance for commercial and industrial applications.

Q: Can I use parts with different operating temperature ranges?

A: Operating temperature range affects reliability in extreme environments. SMBJ70CA and SMBJ70CA-TP support -55°C to 175°C, providing wider temperature coverage than the original -55°C to 150°C specification. Parts with extended temperature ranges are suitable for all applications where the original part was used. Verify your application's temperature requirements before selection.

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