1SMB24AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB24AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 15.4A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	26.7	V
Voltage - Clamping (Max) @ Ipp	38.9	V
Current - Peak Pulse (10/1000µs)	15.4	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65°C to 150°C	TJ
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB24AT3 is determined by strict alignment of the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 24V (exact match required)
Voltage - Breakdown (Min): 26.7V (exact match required)
Voltage - Clamping (Max) @ Ipp: 38.9V (exact match required)
Current - Peak Pulse (10/1000µs): 15.4A minimum (tolerance: ±0.1A acceptable)
Power - Peak Pulse: 600W (exact match required)
Package / Case: DO-214AA or SMB (mechanical compatibility required)
Mounting Type: Surface Mount (required)
Unidirectional Channels: 1 (required)

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting all electrical parameters within specified tolerances and identical package specifications. These parts are pin-compatible and functionally equivalent.

Similar Substitutes: Parts meeting all electrical parameters but with different package types (SOD-128) or enhanced specifications (automotive grade, extended temperature range). These require board-level design verification for mechanical fit.

Parameter Comparison

Part Number	Manufacturer	Vwm (V)	Vbr (Min, V)	Vc (Max, V)	Ipp (A)	Ppk (W)	Package	Status	RoHS
1SMB24AT3	onsemi	24	26.7	38.9	15.4	600	DO-214AA, SMB	Obsolete	Non-compliant
SMBJ24A	MDD	24	26.7	38.9	15.5	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ24A-TR	STMicroelectronics	24	26.7	38.9	16	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ24A/54	Vishay General Semiconductor - Diodes Division	24	26.7	38.9	15.4	600	DO-214AA, SMB	Active	Non-compliant
SMBJ24A-13-F	Diodes Incorporated	24	26.7	38.9	15.4	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ24A-HR	Littelfuse Inc.	24	26.7	38.9	15.5	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ24A-HRA	Littelfuse Inc.	24	26.7	38.9	15.5	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ24A-TP	Micro Commercial Co	24	26.7	38.9	15.4	600	DO-214AA, SMB	Active	ROHS3 Compliant
PTVS24VP1UP,115	Nexperia USA Inc.	24	26.7	38.9	15.4	600	SOD-128	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Pin-Compatible Replacements):

SMBJ24A (MDD), SMBJ24A-TR (STMicroelectronics), SMBJ24A-13-F (Diodes Incorporated), SMBJ24A-HR (Littelfuse Inc.), SMBJ24A-HRA (Littelfuse Inc.), and SMBJ24A-TP (Micro Commercial Co) are functionally equivalent to the 1SMB24AT3 with identical electrical specifications and DO-214AA/SMB package compatibility. All listed active substitutes are ROHS3 compliant, addressing regulatory requirements that the obsolete 1SMB24AT3 does not meet.

Secondary Substitute (Package Variant):

PTVS24VP1UP,115 (Nexperia USA Inc.) meets all electrical specifications but uses the SOD-128 package instead of DO-214AA/SMB. This part is suitable only for new designs where board layout can accommodate the different footprint. Existing PCB designs using DO-214AA/SMB cannot use this variant without redesign.

Compliance Consideration:

For applications requiring RoHS3 compliance, select from the active substitutes listed above. The original 1SMB24AT3 and SMBJ24A/54 (Vishay) are non-compliant and unsuitable for regulated markets.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ24A as a direct replacement for 1SMB24AT3?

A: Yes. SMBJ24A meets all electrical parameters (24V standoff, 26.7V breakdown, 38.9V clamping, 15.5A peak pulse) and uses the identical DO-214AA/SMB package. The 0.1A difference in peak pulse current (15.5A vs. 15.4A) is within acceptable tolerance for this component class.

Q: What is the difference between SMBJ24A-HR and SMBJ24A-HRA?

A: Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications and package type. The suffix designations indicate different product series or manufacturing variants, but substitution between them is valid based on provided parameters.

Q: Why is PTVS24VP1UP,115 listed as a similar substitute rather than a direct substitute?

A: PTVS24VP1UP,115 uses the SOD-128 package, which has a different physical footprint than the DO-214AA/SMB package of the 1SMB24AT3. While electrically equivalent, it requires board-level design changes and cannot be used as a drop-in replacement on existing PCBs.

Q: Are all active substitutes suitable for my application?

A: All active substitutes listed meet the core electrical specifications of the 1SMB24AT3. Selection should be based on availability, RoHS compliance requirements, and any specific certifications your application demands. Verify lead times and inventory with your supplier.

Q: What does RoHS3 compliance mean for this component?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials. For new designs and regulated markets, select ROHS3-compliant substitutes.

Q: Can I substitute SMBJ24A-TP with an extended temperature range (-55°C to 175°C) in place of the original 1SMB24AT3 (-65°C to 150°C)?

A: SMBJ24A-TP has a higher maximum operating temperature (175°C vs. 150°C) but a higher minimum temperature (-55°C vs. -65°C). If your application requires operation below -55°C, SMBJ24A-TP is not suitable. For applications within -55°C to 150°C, it is compatible.

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