SMBJ70A-13 Transient Voltage Suppressor (TVS) Diode Equivalent & Substitute Parts

Part Overview

The SMBJ70A-13 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 70V reverse standoff voltage with 113V maximum clamping voltage and 5.3A peak pulse current capability in a DO-214AA (SMB) package. This part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	70	V
Voltage - Breakdown (Min)	77.8	V
Voltage - Clamping (Max) @ Ipp	113	V
Current - Peak Pulse (10/1000µs)	5.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMBJ70A-13 is determined by strict equivalence across the following critical parameters: reverse standoff voltage (70V nominal), breakdown voltage minimum (77.8V), maximum clamping voltage (113V), peak pulse current rating (5.3A minimum), power dissipation capability (600W), package type (DO-214AA/SMB), and mounting configuration (surface mount). Substitute parts must maintain these electrical specifications within the defined tolerances to ensure functional compatibility in the original circuit application.

The substitute parts are grouped into two categories:

Direct Electrical Equivalents (Same Package): Parts maintaining identical or superior electrical performance in the DO-214AA/SMB package format, enabling direct board-level substitution without layout modification.

Functionally Equivalent Alternatives (Different Package): Parts meeting the core electrical requirements but in alternative surface-mount packages, requiring PCB layout adjustment but offering equivalent circuit protection performance.

Parameter Comparison

Part Number	Manufacturer	VR (Typ) V	VBR (Min) V	VC (Max) V	Ipp A	Package	Status	RoHS
SMBJ70A-13	Diodes Incorporated	70	77.8	113	5.3	DO-214AA, SMB	Discontinued	Non-compliant
SMBJ70A-13-F	Diodes Incorporated	70	77.8	113	5.3	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ70A	MDD	70	77.8	113	5.3	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ70A-TP	Micro Commercial Co	70	77.8	113	5.3	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ70A-TR	STMicroelectronics	70	77.8	113	5.5	DO-214AA, SMB	Active	ROHS3 Compliant
PTVS64VP1UP,115	Nexperia USA Inc.	64	71.1	103	5.8	SOD-128	Active	ROHS3 Compliant
SM6T82AY	STMicroelectronics	70	77.8	146	27	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

SMBJ70A-13-F (Diodes Incorporated) is the direct functional equivalent with identical electrical specifications and DO-214AA/SMB package compatibility. This part is currently in active production status with ROHS3 compliance, making it the preferred replacement for discontinued SMBJ70A-13 applications requiring no design modification.

SMBJ70A-TR (STMicroelectronics) provides equivalent electrical performance with marginally higher peak pulse current (5.5A vs. 5.3A) and maintains the same package format. Active product status and ROHS3 compliance support long-term supply chain stability.

SMBJ70A (MDD) offers identical electrical specifications in the same package with high inventory availability (17,200 pcs) and active status, suitable for applications where manufacturer source diversification is acceptable.

SMBJ70A-TP (Micro Commercial Co) maintains full electrical equivalence with extended operating temperature range (-55°C to 175°C) compared to the original part (-55°C to 150°C), providing enhanced thermal performance in demanding environments.

Alternative Substitutes (Package Variation):

SM6T82AY (STMicroelectronics) maintains the 70V reverse standoff voltage and DO-214AA/SMB package but features significantly higher peak pulse current (27A) and clamping voltage (146V). This part is suitable only for applications where higher transient energy absorption is required or beneficial, and requires verification that the elevated clamping voltage does not exceed downstream component voltage ratings.

PTVS64VP1UP,115 (Nexperia USA Inc.) operates at a lower reverse standoff voltage (64V) with reduced clamping voltage (103V) in a different package format (SOD-128). This part is not recommended as a direct substitute due to voltage parameter deviation and package incompatibility, but may be considered for redesigned circuits where the lower voltage rating is acceptable.

Frequently Asked Questions (FAQ)

Q: Can SMBJ70A-13-F be used as a direct replacement for SMBJ70A-13?

A: Yes. SMBJ70A-13-F is electrically identical to SMBJ70A-13 with matching reverse standoff voltage (70V), breakdown voltage (77.8V), clamping voltage (113V), and peak pulse current (5.3A). Both use the DO-214AA/SMB package, enabling direct board-level substitution without layout modification. SMBJ70A-13-F is in active production with ROHS3 compliance.

Q: What is the difference between SMBJ70A-TR and SMBJ70A-13?

A: SMBJ70A-TR and SMBJ70A-13 share identical voltage specifications (70V standoff, 77.8V breakdown, 113V clamping) and package format (DO-214AA/SMB). The primary difference is peak pulse current: SMBJ70A-TR is rated at 5.5A compared to 5.3A for SMBJ70A-13. This marginal increase provides slightly enhanced transient protection capability. SMBJ70A-TR is manufactured by STMicroelectronics and is in active status.

Q: Why is SM6T82AY not recommended as a direct substitute?

A: While SM6T82AY maintains the 70V reverse standoff voltage and DO-214AA/SMB package, it features a significantly higher maximum clamping voltage (146V vs. 113V) and substantially higher peak pulse current (27A vs. 5.3A). The elevated clamping voltage may exceed the voltage tolerance of protected components, potentially causing damage. SM6T82AY is suitable only for applications specifically requiring higher transient energy absorption.

Q: Can PTVS64VP1UP,115 replace SMBJ70A-13?

A: PTVS64VP1UP,115 is not a suitable direct substitute. It operates at a lower reverse standoff voltage (64V vs. 70V) and lower clamping voltage (103V vs. 113V), reducing protection margin in circuits designed for 70V standoff operation. Additionally, the SOD-128 package differs from the DO-214AA/SMB package, requiring PCB layout redesign. This part may be considered only for circuits redesigned to accommodate lower voltage ratings.

Q: What packaging options are available for 70V TVS diodes equivalent to SMBJ70A-13?

A: All primary substitutes (SMBJ70A-13-F, SMBJ70A, SMBJ70A-TP, SMBJ70A-TR) are available in the DO-214AA/SMB package, enabling direct board-level replacement. PTVS64VP1UP,115 is available in SOD-128 package but with reduced voltage specifications. For applications requiring the DO-214AA/SMB package format with 70V specifications, the primary substitutes provide complete compatibility.

Q: Are all substitute parts RoHS compliant?

A: SMBJ70A-13-F, SMBJ70A, SMBJ70A-TP, SMBJ70A-TR, PTVS64VP1UP,115, and SM6T82AY are all ROHS3 compliant. The original SMBJ70A-13 is RoHS non-compliant. For applications requiring RoHS compliance, any of the active substitute parts satisfy regulatory requirements.

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