SMBJ70C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ70C is a surface-mount transient voltage suppressor diode manufactured by Littelfuse Inc. in the DO-214AA (SMB) package. This bidirectional zener TVS diode is designed for general-purpose overvoltage protection applications with a 70V reverse standoff voltage rating and 118.65V maximum clamping voltage at peak pulse current.

The SMBJ70C is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers including Semtech Corporation, STMicroelectronics, Diodes Incorporated, Vishay General Semiconductor, Micro Commercial Co, and Comchip Technology. These alternatives maintain electrical compatibility while offering active product status and improved availability.

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
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SMBJ70C are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 70V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1
Power - Peak Pulse: 600W
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Acceptable Variation Parameters:

Voltage - Breakdown (Min): 73.71V to 77.8V
Voltage - Clamping (Max) @ Ipp: 113V to 146V
Current - Peak Pulse (10/1000µs): 5.3A to 27A
Operating Temperature Range: -55°C to 175°C (extended range acceptable)

All substitute parts maintain the same 70V reverse standoff voltage, DO-214AA package, and surface-mount configuration. Variations in clamping voltage and peak pulse current reflect different manufacturer specifications while remaining functionally compatible for general-purpose transient protection applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Breakdown (Min) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Operating Temperature [°C]	Product Status	Package
SMBJ70C	Littelfuse Inc.	70	73.71	118.65	5.3	-65 to 150	Obsolete	DO-214AA, SMB
SMBJ70CA	Semtech Corporation	70	77.8	113	5.3	-55 to 175	Active	DO-214AA, SMB
SM6T82CAY	STMicroelectronics	70	77.8	146	27 (8/20µs)	-55 to 150	Active	DO-214AA, SMB
SMBJ70CA-13-F	Diodes Incorporated	70	77.8	113	5.3	-55 to 150	Active	DO-214AA, SMB
SMBJ70CA-M3/52	Vishay General Semiconductor - Diodes Division	70	77.8	113	5.3	-55 to 150	Active	DO-214AA, SMB
SMBJ70CA-M3/5B	Vishay General Semiconductor - Diodes Division	70	77.8	113	5.3	-55 to 150	Active	DO-214AA, SMB
SMBJ70CA-TP	Micro Commercial Co	70	77.8	113	5.3	-55 to 175	Active	DO-214AA, SMB
SMBJ70CA-TR	STMicroelectronics	70	77.8	113	5.5	-55 to 150	Active	DO-214AA, SMB
TV06B700JB-G	Comchip Technology	70	77.8	113	5.31	Not specified	Active	DO-214AA, SMB

Engineering Selection Recommendations

Primary Recommendation: SMBJ70CA (Semtech Corporation)

SMBJ70CA is the manufacturer-recommended substitute with active product status. It maintains the 70V reverse standoff voltage and DO-214AA package configuration. The clamping voltage of 113V is within acceptable operating parameters. Extended operating temperature range (-55°C to 175°C) provides broader application flexibility compared to the obsolete SMBJ70C.

Alternative Options:

SMBJ70CA-TR (STMicroelectronics) and SMBJ70CA-TP (Micro Commercial Co) are functionally equivalent alternatives with active status. Both maintain identical electrical specifications and package configuration. SMBJ70CA-TR offers ROHS3 compliance and REACH Unaffected status. SMBJ70CA-TP provides extended temperature range to 175°C.

Vishay General Semiconductor variants (SMBJ70CA-M3/52 and SMBJ70CA-M3/5B) are active alternatives with TransZorb® series designation. Both are ROHS3 compliant and REACH Unaffected. Packaging options differ (Tape & Reel) but electrical specifications remain compatible.

Higher Current Alternative: SM6T82CAY (STMicroelectronics)

SM6T82CAY is an active substitute with automotive-grade qualification (AEC-Q101). Peak pulse current rating of 27A (8/20µs) exceeds the SMBJ70C specification. Clamping voltage of 146V is higher but remains within acceptable protection parameters. This option is suitable for applications requiring enhanced transient suppression capability.

Packaging Considerations:

All substitute parts are available in DO-214AA (SMB) surface-mount package. Packaging formats vary (Tape & Reel, Cut Tape, Digi-Reel) but do not affect electrical compatibility. Selection should align with assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ70CA directly replace SMBJ70C in existing designs?

A: Yes. Both parts maintain the same 70V reverse standoff voltage, DO-214AA package, and surface-mount configuration. Electrical specifications are compatible for general-purpose transient protection applications. SMBJ70CA offers active product status and improved availability.

Q: What is the difference between clamping voltage specifications (118.65V vs 113V)?

A: Clamping voltage represents the maximum voltage across the TVS diode at peak pulse current. The SMBJ70C specifies 118.65V while most substitutes specify 113V. Both values fall within acceptable protection parameters for 70V standoff applications. The lower clamping voltage in substitutes indicates slightly improved transient suppression characteristics.

Q: Is SM6T82CAY suitable as a substitute despite higher peak pulse current (27A)?

A: Yes. SM6T82CAY is a qualified substitute with higher current rating. The increased peak pulse current (27A vs 5.3A) provides enhanced transient suppression capability. This part is automotive-grade (AEC-Q101 qualified) and suitable for applications requiring more robust overvoltage protection.

Q: What packaging options are available for substitute parts?

A: All substitute parts use DO-214AA (SMB) surface-mount package. Packaging formats include Tape & Reel (TR), Cut Tape (CT), and Digi-Reel. These format variations do not affect electrical compatibility and should be selected based on assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). This ensures compliance with environmental and regulatory requirements equivalent to the original SMBJ70C specification.

Q: What is the operating temperature range difference between SMBJ70C and substitutes?

A: SMBJ70C operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C or -55°C to 175°C. The narrower lower temperature limit (-55°C vs -65°C) in substitutes is acceptable for most applications. Extended upper temperature range (175°C) in some variants provides additional thermal margin.

Q: Which substitute offers the best availability?

A: SMBJ70CA (Semtech Corporation) and SMBJ70CA-TP (Micro Commercial Co) offer the highest inventory levels (10,200 and 9,893 units respectively). Both are active products with immediate availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message