1SMC70AT3 Equivalent & Substitute Parts

Part Overview

The 1SMC70AT3 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, rated for 1500W peak pulse power at 70V reverse standoff voltage. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part is housed in an SMC (DO-214AB) surface mount package and is RoHS non-compliant with unlimited moisture sensitivity rating.

Substiute Parts

1SMC70AT3

onsemiIn Stock: 11671SMC70AT3 Datasheet

Current PartRFQ

1SMC70A TR13

Central Semiconductor CorpIn Stock: 66181SMC70A TR13 Datasheet

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SMCJ70A

MeritekIn Stock: 4798SMCJ70A Datasheet

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SMCJ70A

MeritekIn Stock: 4798SMCJ70A Datasheet

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SMCJ70A-TP

Micro Commercial CoIn Stock: 6784SMCJ70A-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMC70AT3 are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 70V
• Power - Peak Pulse: 1500W (1.5kW)
• Unidirectional Channels: 1
• Package / Case: SMC (DO-214AB)
• Mounting Type: Surface Mount
• Type: Zener

All substitute parts listed maintain identical reverse standoff voltage, peak pulse power rating, unidirectional topology, and SMC surface mount packaging. Variations in clamping voltage, peak pulse current, and operating temperature ranges are within acceptable substitution parameters for this component category.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (1SMC70A TR13, SMCJ70A, and SMCJ70A-TP) are active products with identical electrical specifications for the critical parameters: 70V reverse standoff voltage, 1500W peak pulse power, and SMC surface mount packaging.

For new designs requiring RoHS3 compliance, SMCJ70A (Meritek) and SMCJ70A-TP (Micro Commercial Co) are compliant alternatives. The 1SMC70A TR13 (Central Semiconductor) maintains RoHS non-compliant status consistent with the original 1SMC70AT3.

SMCJ70A-TP offers the widest operating temperature range (-55°C ~ 175°C), providing additional thermal margin for high-temperature applications. The 1SMC70A TR13 extends the lower temperature limit to -65°C for cryogenic environments.

All substitute parts maintain unlimited moisture sensitivity rating (MSL 1) and are REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can SMCJ70A and SMCJ70A-TP be used interchangeably with 1SMC70AT3?

A: Yes. Both parts share identical reverse standoff voltage (70V), peak pulse power (1500W), clamping voltage (113V), and SMC surface mount packaging. The primary differences are product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between 1SMC70A TR13 and SMCJ70A?

A: Both are functionally equivalent with 70V standoff voltage and 1500W power rating. The 1SMC70A TR13 is manufactured by Central Semiconductor and maintains RoHS non-compliant status. SMCJ70A is manufactured by Meritek and is ROHS3 compliant. The 1SMC70A TR13 supports a lower operating temperature minimum (-65°C vs. -55°C).

Q: Why does SMCJ70A-TP have a higher maximum operating temperature?

A: SMCJ70A-TP is rated to -55°C ~ 175°C (TJ), compared to -55°C ~ 150°C for SMCJ70A. This extended thermal range is a design characteristic of the Micro Commercial Co variant and provides additional margin for high-temperature circuit environments.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. SMCJ70A and SMCJ70A-TP are ROHS3 compliant. The 1SMC70A TR13 and original 1SMC70AT3 are RoHS non-compliant. Select SMCJ70A or SMCJ70A-TP for applications requiring RoHS3 compliance.

Q: Do all substitutes use the same SMC package?

A: Yes. All parts use DO-214AB (SMC) surface mount packaging with identical pinout and footprint compatibility.

Q: What is the peak pulse current specification for each part?

A: 1SMC70A TR13 and SMCJ70A-TP are rated at 13.3A peak pulse current (10/1000µs). SMCJ70A is rated at 13.27A. These values are equivalent for practical circuit design purposes.