SMAJ70A-13 Equivalent & Substitute Parts

Part Overview

The SMAJ70A-13 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose transient protection applications. It features a 70V reverse standoff voltage with a 113V maximum clamping voltage and 4.6A peak pulse current capability in a surface-mount SMA (DO-214AC) package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMAJ70A-13

Diodes IncorporatedIn Stock: 1204SMAJ70A-13 Datasheet

Current PartRFQ

SMAJ70A-13-F

Diodes IncorporatedIn Stock: 7864SMAJ70A-13-F Datasheet

DirectRFQ

SMAJ70A

MDDIn Stock: 6118SMAJ70A Datasheet

DirectRFQ

SMAJ70A

MDDIn Stock: 6118SMAJ70A Datasheet

DirectRFQ

PTVS64VS1UR,115

Nexperia USA Inc.In Stock: 4379PTVS64VS1UR,115 Datasheet

MFR RecommendedRFQ

SM4T82AY

STMicroelectronicsIn Stock: 4656SM4T82AY Datasheet

MFR RecommendedRFQ

SMAJ70A-TP

Micro Commercial CoIn Stock: 5766SMAJ70A-TP Datasheet

MFR RecommendedRFQ

SMAJ70A-TR

STMicroelectronicsIn Stock: 2492SMAJ70A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ70A-13 are categorized based on electrical and mechanical compatibility. The primary substitution criteria are:

Electrical Parameters (Must Match or Exceed):

• Voltage - Reverse Standoff: 70V (nominal)
• Voltage - Breakdown (Min): 77.8V or higher
• Voltage - Clamping (Max) @ Ipp: 113V or lower (to maintain protection threshold)
• Current - Peak Pulse: 4.6A or higher
• Power - Peak Pulse: 400W or higher

Mechanical Parameters (Must Match):

• Package / Case: DO-214AC, SMA (or compatible surface-mount package)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Compliance & Status:

• RoHS3 Compliance preferred (original part is non-compliant)
• Active product status preferred (original part is discontinued)

Parameter Comparison

Engineering Selection Recommendations

Direct Electrical & Mechanical Equivalents (Recommended Primary Substitutes):

SMAJ70A-13-F, SMAJ70A (MDD), and SMAJ70A-TP are direct functional equivalents with identical electrical specifications (70V standoff, 77.8V breakdown, 113V clamping, 4.6A peak pulse). All three are active products with ROHS3 compliance, making them suitable drop-in replacements. SMAJ70A-13-F is the same base part from the original manufacturer (Diodes Incorporated) with improved compliance status.

Enhanced Performance Alternatives (Higher Current Capability):

SMAJ70A-TR (STMicroelectronics) and SM4T82AY (STMicroelectronics) maintain the 70V standoff voltage and DO-214AC/SMA package but provide enhanced performance with 16A peak pulse current (8/20µs) and 146V clamping voltage. These are suitable when higher transient energy absorption is required within the same voltage class.

Package Variant (Different Form Factor):

PTVS64VS1UR,115 (Nexperia USA Inc.) operates at a lower standoff voltage (64V) and uses a SOD-123W package instead of SMA. This part is not recommended as a direct substitute due to package incompatibility and lower voltage rating, but may be considered for new designs where the lower voltage threshold is acceptable and board space is constrained.

Compliance & Availability:

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance. The original SMAJ70A-13 is discontinued and non-compliant, making transition to an active equivalent necessary for new procurement.

Frequently Asked Questions (FAQ)

Q: Can SMAJ70A-13-F be used as a direct replacement for SMAJ70A-13?

A: Yes. SMAJ70A-13-F is electrically and mechanically identical to SMAJ70A-13, with the same 70V standoff voltage, 113V clamping voltage, and 4.6A peak pulse current in the same DO-214AC/SMA package. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). It is a direct drop-in replacement.

Q: What is the difference between SMAJ70A-TR and SMAJ70A-13?

A: Both parts share the same 70V standoff voltage and DO-214AC/SMA package. However, SMAJ70A-TR provides higher peak pulse current (16A at 8/20µs vs. 4.6A at 10/1000µs) and higher clamping voltage (146V vs. 113V). SMAJ70A-TR is suitable when greater transient energy absorption is required.

Q: Why is PTVS64VS1UR,115 listed as a substitute if it has a different voltage rating?

A: PTVS64VS1UR,115 is listed as a manufacturer-recommended alternative but is not a direct equivalent. Its 64V standoff voltage is lower than the 70V requirement, and it uses a SOD-123W package instead of SMA. It should only be considered for new designs where the lower voltage threshold is acceptable and package compatibility is confirmed.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status. The original SMAJ70A-13 is non-compliant, making compliance an important consideration for new procurement and regulatory requirements.

Q: What is the difference between tape & reel (TR) and other packaging options?

A: Tape & reel (TR) packaging is standard for automated assembly processes and high-volume production. Parts without specified packaging may be available in alternative formats. Confirm packaging requirements with your procurement process before ordering.

Q: Can SMAJ70A (MDD) and SMAJ70A-TP be used interchangeably?

A: Yes. Both parts have identical electrical specifications (70V standoff, 77.8V breakdown, 113V clamping, 4.6A peak pulse) and the same DO-214AC/SMA package. Both are active products with ROHS3 compliance. They are functionally interchangeable.