SMAJ70A-TP Equivalent & Substitute Parts

Part Overview

The SMAJ70A-TP is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose transient voltage protection in surface-mount applications. This component features a 70V reverse standoff voltage with a 113V maximum clamping voltage at peak pulse current, housed in a DO-214AC (SMA) package format. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching electrical performance parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current rating, and power dissipation capability, combined with compatible surface-mount packaging and active product status.

Substiute Parts

SMAJ70A-TP

Micro Commercial CoIn Stock: 5766SMAJ70A-TP Datasheet

Current PartRFQ

SMAJ70A

MDDIn Stock: 6118SMAJ70A Datasheet

DirectRFQ

SMAJ70A

MDDIn Stock: 6118SMAJ70A Datasheet

DirectRFQ

SMAJ70A-13-F

Diodes IncorporatedIn Stock: 7864SMAJ70A-13-F Datasheet

DirectRFQ

SZ1SMA70AT3G

Littelfuse Inc.In Stock: 3115SZ1SMA70AT3G Datasheet

DirectRFQ

SM4T82AY

STMicroelectronicsIn Stock: 4656SM4T82AY Datasheet

SimilarRFQ

SMAJ70A-TR

STMicroelectronicsIn Stock: 2492SMAJ70A-TR Datasheet

SimilarRFQ

SMAT70A-13-F

Diodes IncorporatedIn Stock: 7064SMAT70A-13-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ70A-TP are classified into two categories based on electrical parameter alignment:

Direct Electrical Equivalents match all critical electrical parameters: 70V reverse standoff voltage, 77.8V minimum breakdown voltage, 113V maximum clamping voltage, 4.6A peak pulse current, and 400W peak pulse power rating. These parts maintain identical functional performance within the specified operating conditions.

Similar Electrical Alternatives share the same 70V reverse standoff and 77.8V breakdown voltage but differ in clamping voltage or peak pulse current specifications. These parts provide transient protection at the same voltage threshold but with different response characteristics.

All substitute candidates are surface-mount devices in DO-214AC (SMA) package format with active product status and ROHS3 compliance, ensuring mechanical and environmental compatibility with the original part.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Recommended for Drop-In Replacement)

SMAJ70A (MDD), SMAJ70A-13-F (Diodes Incorporated), and SZ1SMA70AT3G (Littelfuse Inc.) provide identical electrical performance to the SMAJ70A-TP across all critical parameters. All three maintain 70V reverse standoff, 113V clamping voltage, and 4.6A peak pulse current specifications. Selection among these three should be based on availability, lead time, and packaging preference (tape & reel versus cut tape). SZ1SMA70AT3G includes automotive-grade qualification (AEC-Q101) and extended lower temperature rating (-65°C minimum), suitable for automotive or harsh environment applications.

Higher Current Alternatives (Performance Enhancement)

SM4T82AY and SMAJ70A-TR (both STMicroelectronics) maintain the same 70V reverse standoff voltage but provide significantly higher peak pulse current (16A at 8/20µs pulse width) and elevated clamping voltage (146V). These parts are suitable for applications requiring greater transient energy absorption. Both include automotive-grade qualification (AEC-Q101). Selection of these alternatives requires circuit validation to confirm that the higher clamping voltage does not exceed downstream component voltage ratings.

Lower Clamping Voltage Alternative

SMAT70A-13-F (Diodes Incorporated) maintains 70V reverse standoff and 4.6A peak pulse current but reduces clamping voltage to 100V. This part is applicable only when circuit design specifically requires lower clamping voltage response. Operating temperature range is -55°C to 150°C, matching most industrial applications.

All recommended substitutes are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity) and active product status, ensuring regulatory compliance and supply continuity.

Frequently Asked Questions (FAQ)

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

A: Yes. SMAJ70A-13-F matches all critical electrical parameters: 70V reverse standoff, 77.8V breakdown voltage, 113V clamping voltage, and 4.6A peak pulse current. Both are surface-mount devices in DO-214AC (SMA) package format. The primary difference is operating temperature range (SMAJ70A-13-F: -55°C to 150°C versus SMAJ70A-TP: -55°C to 175°C). For applications operating above 150°C, the original part is required.

Q: What is the difference between SMAJ70A-TP and SZ1SMA70AT3G?

A: Both parts provide identical electrical performance (70V standoff, 113V clamping, 4.6A peak pulse current). SZ1SMA70AT3G is automotive-qualified (AEC-Q101) with extended lower temperature rating (-65°C minimum versus -55°C). Selection depends on application requirements: SZ1SMA70AT3G for automotive or extreme cold environments; SMAJ70A-TP for general industrial applications.

Q: Why would I select SM4T82AY instead of SMAJ70A-TP?

A: SM4T82AY provides higher peak pulse current (16A versus 4.6A) and higher clamping voltage (146V versus 113V). This part is selected when circuit transient energy levels exceed the capacity of the original part. Circuit validation is required to confirm that 146V clamping voltage is acceptable for downstream components.

Q: Are all substitute parts available in tape & reel packaging?

A: Most substitutes are available in tape & reel (TR) format. SMAJ70A (MDD) packaging is not specified in available data. SMAT70A-13-F is available in cut tape (CT) and Digi-Reel format. Verify packaging availability with your supplier before design finalization.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity), matching the environmental compliance of SMAJ70A-TP.