SMF15AT1 Equivalent & Substitute Parts

Part Overview

The SMF15AT1 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. Specified with a 15V reverse standoff voltage and 24.4V maximum clamping voltage at 8.2A peak pulse current, this component operates across -55°C to 150°C. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	SMF15AT1	Unit
Voltage - Reverse Standoff (Typ)	15V	V
Voltage - Breakdown (Min)	16.7V	V
Voltage - Clamping (Max) @ Ipp	24.4V	V
Current - Peak Pulse (10/1000µs)	8.2A	A
Power - Peak Pulse	200W	W
Operating Temperature	-55°C ~ 150°C	°C (TJ)
Package / Case	SOD-123F	-
Mounting Type	Surface Mount	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution of the SMF15AT1 is determined by strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 15V nominal
Voltage - Clamping (Max) @ Ipp: 24.4V nominal
Current - Peak Pulse (10/1000µs): 8.2A nominal
Power - Peak Pulse: 200W
Type: Zener, Unidirectional (1 channel)
Mounting Type: Surface Mount
Package compatibility: SOD-123F or equivalent mechanical footprint (DO-219AB/SMF)

Direct Equivalent: The SMF15A-E3-08 from Vishay General Semiconductor - Diodes Division is a direct functional equivalent with identical electrical specifications and active product status.

Similar Alternatives: Parts SMF11A, SMF12A, SMF13A, SMF16A, SMF17A, and SMF18A represent the SMF series family with voltage ratings spanning 11V to 18V reverse standoff. These alternatives maintain the same 200W peak pulse power rating, surface-mount construction, and general-purpose application profile, but with different voltage and current characteristics suited to alternative protection requirements.

Parameter Comparison

Parameter	SMF15AT1	SMF15A-E3-08	SMF11A	SMF12A	SMF13A	SMF16A	SMF17A	SMF18A	Unit
Voltage - Reverse Standoff (Typ)	15V	15V	11V	12V	13V	16V	17V	18V	V
Voltage - Breakdown (Min)	16.7V	16.7V	12.2V	13.3V	14.4V	17.8V	18.9V	20V	V
Voltage - Clamping (Max) @ Ipp	24.4V	24.4V	18.2V	19.9V	21.5V	26V	27.6V	29.2V	V
Current - Peak Pulse (10/1000µs)	8.2A	8.2A	11A	10.1A	9.3A	7.7A	7.25A	6.8A	A
Power - Peak Pulse	200W	200W	200W	200W	200W	200W	200W	200W	W
Operating Temperature	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	°C (TJ)
Package / Case	SOD-123F	DO-219AB	SOD-123F, SMF	SOD-123F, SMF	SOD-123F	SOD-123F, SMF	SOD-123F	SOD-123F, SMF	-
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener	-
Unidirectional Channels	1	1	1	1	1	1	1	1	-
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	-

Engineering Selection Recommendations

Direct Replacement: SMF15A-E3-08 (Vishay General Semiconductor - Diodes Division) is the recommended direct substitute for SMF15AT1. This part maintains identical electrical specifications (15V standoff, 24.4V clamping, 8.2A peak pulse) and is in active production status. The part is ROHS3 compliant and offers an extended operating temperature range (-65°C to 175°C) compared to the original. Package compatibility is confirmed through DO-219AB (SMF) mechanical equivalence to SOD-123F footprint. High inventory availability (38,200 pcs) ensures supply continuity.

Alternative Selection Criteria: When direct replacement is unavailable or when circuit protection requirements differ from the original 15V specification, selection from the SMF series alternatives must be based on:

Voltage Rating Match: Choose the part whose reverse standoff voltage aligns with the protected circuit's nominal operating voltage. Lower voltage ratings (SMF11A, SMF12A, SMF13A) provide protection for lower-voltage circuits; higher ratings (SMF16A, SMF17A, SMF18A) protect higher-voltage systems.
Clamping Voltage Compatibility: Verify that the maximum clamping voltage does not exceed the maximum input voltage tolerance of downstream components.
Current Capacity: Confirm that peak pulse current rating meets or exceeds the expected transient current in the protected circuit.
Compliance Requirements: All active alternatives are ROHS3 compliant, addressing regulatory requirements that the obsolete SMF15AT1 does not meet.
Temperature Range: SMF15A-E3-08 provides the widest operating range (-65°C to 175°C); other alternatives operate within -50°C to -55°C minimum and 150°C maximum.

Frequently Asked Questions (FAQ)

Q: Can SMF15A-E3-08 be used as a direct drop-in replacement for SMF15AT1?

A: Yes. SMF15A-E3-08 provides identical electrical specifications (15V standoff, 24.4V clamping, 8.2A peak pulse, 200W power) and is mechanically compatible through DO-219AB (SMF) package equivalence to the original SOD-123F footprint. The part is in active production and ROHS3 compliant.

Q: What is the difference between SMF15AT1 and other SMF series parts?

A: The SMF series represents a family of unidirectional TVS diodes with voltage ratings from 11V to 18V reverse standoff. All maintain 200W peak pulse power and surface-mount construction. Selection depends on the specific voltage protection requirement of the application. SMF15AT1 and SMF15A-E3-08 are both 15V devices; other ratings serve different circuit protection needs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (SMF15A-E3-08, SMF11A, SMF12A, SMF13A, SMF16A, SMF17A, SMF18A) are ROHS3 compliant. The original SMF15AT1 is RoHS non-compliant, making compliance-certified alternatives necessary for new designs and regulated applications.

Q: What package considerations apply when substituting SMF15AT1?

A: The original SMF15AT1 uses SOD-123F package. SMF15A-E3-08 uses DO-219AB (SMF) package, which is mechanically equivalent and compatible with SOD-123F PCB footprints. Other alternatives in the SMF series use SOD-123F or SMF/SOD-123FL packages, all mechanically compatible with the original footprint.

Q: How do I select between SMF15A-E3-08 and other SMF alternatives?

A: Use SMF15A-E3-08 for direct replacement when the original 15V protection specification is required. Select alternative voltage ratings only when circuit protection requirements differ from 15V. Verify clamping voltage and peak pulse current specifications match the transient protection needs of your specific application.

Q: What inventory status should I consider?

A: SMF15A-E3-08 has 38,200 pcs in stock, providing strong supply availability. All alternative parts maintain active inventory (1,930 to 26,400 pcs), ensuring procurement feasibility across the SMF series.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message