1SMC15AT3 Equivalent & Substitute Parts

Part Overview

The 1SMC15AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose voltage clamping applications. This component features a 15V reverse standoff voltage and 24.4V maximum clamping voltage in an SMC package. The part is currently obsolete, making identification of active equivalent components essential for ongoing design support and procurement.

Substiute Parts

1SMC15AT3

onsemiIn Stock: 33591SMC15AT3 Datasheet

Current PartRFQ

SMCJ15A

EVVO SemiIn Stock: 359272SMCJ15A Datasheet

DirectRFQ

SMCJ15A

EVVO SemiIn Stock: 359272SMCJ15A Datasheet

DirectRFQ

SMCJ15A-TR

STMicroelectronicsIn Stock: 18185SMCJ15A-TR Datasheet

DirectRFQ

SMCJ15A-TP

Micro Commercial CoIn Stock: 3883SMCJ15A-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMC15AT3 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 15V
• Voltage - Clamping (Max) @ Ipp: 24.4V
• Package / Case: SMC (DO-214AC or DO-214AB)
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional

The substitute parts listed maintain these core specifications while offering active product status and improved compliance certifications. Variations in peak pulse current and power dissipation are acceptable within the same voltage class when the clamping voltage remains within specification.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance, addressing the obsolescence and compliance limitations of the 1SMC15AT3.

SMCJ15A (EVVO Semi) and SMCJ15A-TP (Micro Commercial Co) maintain identical clamping voltage specifications (24.4V) and peak pulse current (61.5A), providing direct electrical equivalence. SMCJ15A-TP offers extended operating temperature range (-55°C to 175°C) compared to SMCJ15A (-65°C to 150°C).

SMCJ15A-TR (STMicroelectronics) features higher clamping voltage (32.5V) and significantly higher peak pulse current (308A at 8/20µs), with proportionally increased power dissipation (1.5kW). This variant is suitable for applications requiring enhanced transient suppression capability.

Package considerations: SMCJ15A uses DO-214AC (SMA), while SMCJ15A-TR and SMCJ15A-TP use DO-214AB (SMC). PCB layout and footprint compatibility must be verified during design transition.

Frequently Asked Questions (FAQ)

Q: Can SMCJ15A-TR be used as a direct replacement for 1SMC15AT3?

A: SMCJ15A-TR maintains the 15V reverse standoff voltage but specifies 32.5V maximum clamping voltage versus 24.4V in the original part. This higher clamping voltage may affect circuit performance in applications with tight voltage margin requirements. Electrical simulation or testing is necessary to confirm suitability for your specific application.

Q: What is the difference between SMCJ15A and SMCJ15A-TP?

A: Both parts specify identical electrical parameters (15V standoff, 24.4V clamping, 61.5A peak pulse). SMCJ15A-TP offers extended maximum operating temperature (175°C vs. 150°C). SMCJ15A uses DO-214AC (SMA) packaging, while SMCJ15A-TP uses DO-214AB (SMC) packaging. Package selection depends on PCB footprint requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts carry ROHS3 compliance certification, whereas the original 1SMC15AT3 is RoHS non-compliant. This addresses regulatory requirements for new designs and procurement.

Q: What packaging options are available?

A: SMCJ15A is supplied in DO-214AC (SMA) with Cut Tape and Digi-Reel packaging. SMCJ15A-TR and SMCJ15A-TP are supplied in DO-214AB (SMC) in Tape & Reel format. Verify PCB footprint compatibility before selection.

Q: How do peak pulse current ratings affect substitution?

A: SMCJ15A and SMCJ15A-TP specify 61.5A peak pulse current, matching the original specification. SMCJ15A-TR specifies 308A (8/20µs), providing higher transient suppression capability. Higher current ratings do not prevent substitution but indicate enhanced performance margin for transient events.