1SMB10AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB10AT3 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 10V reverse standoff voltage, 17V maximum clamping voltage, and 35.3A peak pulse current capability in a DO-214AA (SMB) package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	10	V
Voltage - Breakdown (Min)	11.1	V
Voltage - Clamping (Max) @ Ipp	17	V
Current - Peak Pulse (10/1000µs)	35.3	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the 1SMB10AT3 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 10V (nominal)
Voltage - Breakdown (Min): 11.1V or 11V
Voltage - Clamping (Max) @ Ipp: 17V
Current - Peak Pulse (10/1000µs): 35.3A or higher
Power - Peak Pulse: 600W or higher
Package / Case: DO-214AA (SMB)
Unidirectional Channels: 1
Mounting Type: Surface Mount

Direct substitutes maintain identical electrical specifications and package form factor. Similar substitutes meet the core voltage and current protection requirements but may differ in secondary parameters such as package variant, temperature range, or clamping voltage tolerance.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR Min (V)	VC Max @ Ipp (V)	Ipp (A)	Ppk (W)	Package	Temp Range (°C)	Status	RoHS
1SMB10AT3	onsemi	10	11.1	17	35.3	600	DO-214AA, SMB	-65 to 150	Obsolete	Non-compliant
SMBJ10A	MDD	10	11	17	35.3	600	DO-214AA, SMB	-50 to 150	Active	ROHS3 Compliant
PTVS10VP1UP,115	Nexperia USA Inc.	10	11.1	17	35.3	600	SOD-128	-55 to 150	Active	ROHS3 Compliant
SACB10	Littelfuse Inc.	10	11.1	16.3	29	500	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
SMBJ10A-13-F	Diodes Incorporated	10	11.1	17	35.3	600	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
SMBJ10A-HR	Littelfuse	10	11.1	17	35.3	600	DO-214AA, SMB	-65 to 150	Active	ROHS3 Compliant
SMBJ10A-HRA	Littelfuse Inc.	10	11.1	17	35.3	600	DO-214AA, SMB	-65 to 150	Active	ROHS3 Compliant
SMBJ10A-TP	Micro Commercial Co	10	11.1	17	35.3	600	DO-214AA, SMB	-55 to 175	Active	ROHS3 Compliant
SMBJ10A-TR	STMicroelectronics	10	11.1	17	37	600	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct substitutes for the 1SMB10AT3 that maintain full electrical and mechanical compatibility are SMBJ10A-13-F (Diodes Incorporated), SMBJ10A-HR (Littelfuse), SMBJ10A-HRA (Littelfuse Inc.), SMBJ10A-TP (Micro Commercial Co), and SMBJ10A-TR (STMicroelectronics). All are active products with ROHS3 compliance and identical voltage/current ratings in the DO-214AA SMB package.

SMBJ10A (MDD) is functionally equivalent with matching electrical specifications and active product status. The breakdown voltage minimum is 11V versus 11.1V on the original part, which remains within acceptable tolerance for general-purpose TVS applications.

SMBJ10A-HR and SMBJ10A-HRA both support the full -65°C to 150°C temperature range of the original 1SMB10AT3, matching the extended low-temperature specification.

SMBJ10A-TP extends the upper operating temperature to 175°C, providing additional thermal margin for high-temperature environments.

SMBJ10A-TR (STMicroelectronics) delivers 37A peak pulse current, exceeding the 35.3A specification of the original part, offering enhanced transient protection capability.

PTVS10VP1UP,115 (Nexperia USA Inc.) maintains identical electrical specifications but uses the SOD-128 package instead of DO-214AA SMB. This part is suitable only if the PCB layout and footprint accommodate the alternative package geometry.

SACB10 (Littelfuse Inc.) provides a similar voltage protection profile but with reduced peak pulse current (29A) and lower peak pulse power (500W). This part is suitable only for applications with lower transient current requirements than the original specification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ10A (MDD) directly replace 1SMB10AT3 in existing designs?

A: Yes. SMBJ10A maintains the critical electrical parameters: 10V reverse standoff, 17V clamping voltage, 35.3A peak pulse current, and 600W peak pulse power. The package is identical (DO-214AA SMB). The breakdown voltage minimum is 11V versus 11.1V on the original, a difference within normal component tolerance for TVS diodes.

Q: What is the difference between SMBJ10A-HR, SMBJ10A-HRA, and SMBJ10A-TP?

A: All three maintain identical electrical specifications (10V VWM, 17V clamping, 35.3A Ipp, 600W peak power) and DO-214AA SMB packaging. SMBJ10A-HR and SMBJ10A-HRA support -65°C to 150°C operation, matching the original 1SMB10AT3 temperature range. SMBJ10A-TP extends the upper limit to 175°C and supports a lower temperature minimum of -55°C.

Q: Why is PTVS10VP1UP,115 listed as a similar substitute rather than a direct substitute?

A: PTVS10VP1UP,115 uses the SOD-128 package instead of the DO-214AA (SMB) package of the original part. While electrical specifications are identical, the different package footprint requires PCB layout modification. This part is suitable only if the design can accommodate the alternative package geometry.

Q: Is SACB10 a suitable replacement for 1SMB10AT3?

A: SACB10 is suitable only for applications with lower transient current requirements. It provides 10V reverse standoff and 16.3V clamping voltage, matching the protection threshold. However, peak pulse current is 29A and peak pulse power is 500W, both lower than the original 35.3A and 600W specifications. Use SACB10 only if the application does not require the full 35.3A transient protection capability.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (SMBJ10A, SMBJ10A-13-F, SMBJ10A-HR, SMBJ10A-HRA, SMBJ10A-TP, SMBJ10A-TR, PTVS10VP1UP,115, and SACB10) are ROHS3 compliant. The original 1SMB10AT3 is RoHS non-compliant due to its obsolete status.

Q: Which substitute offers the highest peak pulse current?

A: SMBJ10A-TR (STMicroelectronics) delivers 37A peak pulse current, exceeding the original 35.3A specification. This provides additional margin for transient protection in high-stress applications.

Q: Can I use SMBJ10A-TP in applications requiring extended temperature operation?

A: Yes. SMBJ10A-TP supports -55°C to 175°C operation, providing the widest temperature range among the listed substitutes. This is suitable for applications requiring operation above 150°C.

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