SMBJ70CA-13 Equivalent & Substitute Parts

Part Overview

The SMBJ70CA-13 is a Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose transient protection in surface-mount applications. This bidirectional Zener diode operates with a 70V reverse standoff voltage and provides 113V maximum clamping voltage at peak pulse current. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMBJ70CA-13
Manufacturer	Diodes Incorporated
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	70V
Voltage - Breakdown (Min)	77.8V
Voltage - Clamping (Max) @ Ipp	113V
Current - Peak Pulse (10/1000µs)	5.3A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ70CA-13 is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 70V
Voltage - Breakdown (Min): 77.8V
Voltage - Clamping (Max) @ Ipp: 113V (±tolerance acceptable)
Current - Peak Pulse (10/1000µs): 5.3A (±tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1

Substitute parts are grouped into two categories:

Direct Electrical Equivalents: Parts maintaining identical or near-identical clamping voltage (113V) and peak pulse current (5.3A) specifications with the same package footprint.

Functional Equivalents with Enhanced Performance: Parts with the same reverse standoff voltage (70V) and package but with higher clamping voltage or peak pulse current ratings, suitable for applications requiring additional margin.

Parameter Comparison

Parameter	SMBJ70CA-13 (Main)	SMBJ70CA-13-F	SMBJ70CA-TP	SMBJ70CA-TR	SMBJ70CA (Semtech)	SM6T82CAY
Manufacturer	Diodes Incorporated	Diodes Incorporated	Micro Commercial Co	STMicroelectronics	Semtech Corporation	STMicroelectronics
Voltage - Reverse Standoff (Typ)	70V	70V	70V	70V	70V	70V
Voltage - Breakdown (Min)	77.8V	77.8V	77.8V	77.8V	77.8V	77.8V
Voltage - Clamping (Max) @ Ipp	113V	113V	113V	113V	113V	146V
Current - Peak Pulse (10/1000µs)	5.3A	5.3A	5.3A	5.5A	5.3A	27A (8/20µs)
Power - Peak Pulse	600W	600W	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C
Product Status	Discontinued	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

SMBJ70CA-13-F, SMBJ70CA-TP, SMBJ70CA-TR, and SMBJ70CA from Semtech are direct functional replacements with identical electrical specifications. All are currently in active production status with ROHS3 compliance. SMBJ70CA-13-F and SMBJ70CA-TP offer the highest inventory availability (6044 and 9893 units respectively). SMBJ70CA-TP supports extended operating temperature to 175°C, providing thermal margin for demanding applications.

Secondary Substitute (Enhanced Performance):

SM6T82CAY from STMicroelectronics maintains the 70V reverse standoff voltage and DO-214AA package but provides higher clamping voltage (146V) and significantly higher peak pulse current (27A at 8/20µs pulse). This part is suitable for applications requiring additional transient protection margin. It carries AEC-Q101 automotive qualification and ROHS3 compliance.

Compliance Consideration:

The original SMBJ70CA-13 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current regulatory requirements for new designs and procurement.

Frequently Asked Questions (FAQ)

Q: Can SMBJ70CA-13-F be used as a direct replacement for SMBJ70CA-13?

A: Yes. SMBJ70CA-13-F is electrically and mechanically identical to SMBJ70CA-13, with the primary difference being packaging format (Tape & Reel vs. bulk). Both maintain 70V reverse standoff, 113V clamping voltage, and 5.3A peak pulse current. The -13-F variant is currently in active production.

Q: What is the difference between SMBJ70CA-TP and SMBJ70CA-TR?

A: Both parts are electrically equivalent with 70V standoff and 113V clamping voltage. SMBJ70CA-TP is supplied in Cut Tape & Digi-Reel format by Micro Commercial Co and supports operating temperatures to 175°C. SMBJ70CA-TR is supplied in Tape & Reel format by STMicroelectronics with operating temperature to 150°C. Selection depends on packaging requirements and thermal operating range.

Q: When should SM6T82CAY be selected instead of direct equivalents?

A: SM6T82CAY is selected when the application requires higher transient energy absorption or operates in environments with larger voltage transients. The 146V clamping voltage and 27A peak pulse current provide additional protection margin compared to the 113V/5.3A specification of the original part. This part is qualified to AEC-Q101 automotive standards.

Q: Are all substitute parts compatible with the original PCB layout?

A: Yes. All substitute parts use the DO-214AA (SMB) package with identical footprint and pin configuration. No PCB layout modifications are required for mechanical compatibility.

Q: What is the inventory status of substitute parts?

A: SMBJ70CA-TP has the highest availability (9893 units), followed by SMBJ70CA (Semtech, 10200 units) and SMBJ70CA-13-F (6044 units). SM6T82CAY has lower availability (1460 units). Verify current stock with your supplier before design finalization.

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