SMF15AT1G Equivalent & Substitute Parts

Part Overview

The SMF15AT1G is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 15V reverse standoff voltage with a 24.4V maximum clamping voltage at peak pulse current of 8.2A, housed in a SOD-123FL package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	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 Range	-55°C to 150°C	°C (TJ)
Package / Case	SOD-123F	-
Mounting Type	Surface Mount	-
Type	Zener	-
Unidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the SMF15AT1G is determined by strict equivalence across the following electrical parameters: reverse standoff voltage (15V nominal), breakdown voltage minimum (16.7V), maximum clamping voltage (24.4V at peak pulse current), and peak pulse current rating (8.2A). All substitute parts must maintain identical power dissipation capability (200W peak pulse), unidirectional channel configuration (1 channel), and zener diode type classification.

Mechanical compatibility requires surface-mount packaging in SOD-123F or equivalent footprint designations. Operating temperature range must encompass the specified -55°C to 150°C junction temperature window. RoHS3 compliance and REACH unaffected status are mandatory for regulatory alignment with the original component.

Substitute parts are categorized into two groups:

Direct Electrical Equivalents: Parts with identical electrical specifications (15V standoff, 24.4V clamp, 8.2A peak pulse current) and compatible packaging.

Voltage-Variant Alternatives: Parts within the SMF series with different voltage ratings (11V, 12V, 13V, 16V, 17V, 18V standoff) that share identical power dissipation, package form factor, and general-purpose application profile but require circuit-level voltage compatibility verification.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamp Voltage (V)	Peak Pulse Current (A)	Peak Power (W)	Package	Status
SMF15AT1G	Littelfuse Inc.	15	16.7	24.4	8.2	200	SOD-123F	Obsolete
SMF15A	MDD	15	16.7	24.4	8.2	200	SOD-123F	Active
SMF15A-T13	Littelfuse Inc.	15	16.7	24.4	8.2	200	SOD-123F	Active
ATV02W150-HF	Comchip Technology	15	16.7	24.4	8.2	200	SOD-123F	Active
SMF15A-E3-08	Vishay General Semiconductor	15	16.7	24.4	8.2	200	DO-219AB	Active
SMF11A	MDD	11	12.2	18.2	11	200	SOD-123F	Active
SMF12A	MDD	12	13.3	19.9	10.1	200	SOD-123F	Active
SMF13A	Diotec Semiconductor	13	14.4	21.5	9.3	200	SOD-123F	Active
SMF16A	MDD	16	17.8	26	7.7	200	SOD-123F	Active
SMF17A	Diotec Semiconductor	17	18.9	27.6	7.25	200	SOD-123F	Active
SMF18A	MDD	18	20	29.2	6.8	200	SOD-123F	Active

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Specifications):

SMF15A (MDD), SMF15A-T13 (Littelfuse Inc.), and ATV02W150-HF (Comchip Technology) provide complete electrical and mechanical equivalence to the SMF15AT1G. All three maintain 15V standoff voltage, 24.4V clamping voltage, and 8.2A peak pulse current ratings. SMF15A-T13 offers the advantage of Littelfuse Inc. original manufacturer continuity. ATV02W150-HF includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

SMF15A-E3-08 (Vishay General Semiconductor) matches all electrical parameters but uses DO-219AB package designation instead of SOD-123F. Footprint compatibility must be verified before selection, as package geometry differs despite equivalent electrical performance.

Voltage-Variant Alternatives (Same Package, Different Voltage Ratings):

SMF11A, SMF12A, SMF13A, SMF16A, SMF17A, and SMF18A are suitable only when circuit design permits voltage rating adjustment. These parts maintain identical 200W peak power dissipation and SOD-123F surface-mount packaging but feature different standoff and clamping voltage specifications. Selection depends on the protected circuit's actual voltage requirements and transient suppression thresholds.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status consistent with the original SMF15AT1G specification.

Frequently Asked Questions (FAQ)

Q: Can SMF15A directly replace SMF15AT1G without circuit modification?

A: Yes. SMF15A (MDD) provides complete electrical equivalence with identical 15V standoff voltage, 24.4V clamping voltage, and 8.2A peak pulse current. Both use SOD-123F surface-mount packaging. No circuit redesign is required.

Q: What is the difference between SMF15A-T13 and SMF15A?

A: Both parts are electrically identical with 15V standoff and 24.4V clamping specifications. SMF15A-T13 is manufactured by Littelfuse Inc. (original SMF15AT1G manufacturer), while SMF15A is manufactured by MDD. The "-T13" suffix indicates Littelfuse tape-and-reel packaging configuration.

Q: Is ATV02W150-HF suitable for automotive applications?

A: Yes. ATV02W150-HF carries AEC-Q101 automotive qualification and maintains identical electrical specifications (15V standoff, 24.4V clamp, 8.2A peak pulse). It is suitable for automotive-grade circuit protection where reliability certification is required.

Q: Can I use SMF13A or SMF17A as substitutes?

A: SMF13A and SMF17A are voltage-variant alternatives with different standoff ratings (13V and 17V respectively). They share identical 200W peak power and SOD-123F packaging but feature different clamping voltages (21.5V and 27.6V). Use only if your circuit design permits the voltage specification change.

Q: What is the package difference between SMF15A-E3-08 and other SMF15 variants?

A: SMF15A-E3-08 uses DO-219AB package designation, while SMF15AT1G and most alternatives use SOD-123F. Both are surface-mount packages with different physical geometries. Verify PCB footprint compatibility before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SMF15AT1G specification.

Q: Which substitute offers the best inventory availability?

A: SMF15A-E3-08 (Vishay) shows 38,200 pieces in stock, followed by SMF15A (MDD) with 29,200 pieces. Both provide robust supply for production requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message