1SMB7.5AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB7.5AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This unidirectional zener diode features a 7.5V reverse standoff voltage with a 12.9V maximum clamping voltage and 46.5A peak pulse current capability in the DO-214AA (SMB) package. The part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	7.5	V
Voltage - Breakdown (Min)	8.33	V
Voltage - Clamping (Max) @ Ipp	12.9	V
Current - Peak Pulse (10/1000µs)	46.5	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature	-65°C ~ 150°C	TJ
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMB7.5AT3 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff (Typ): 7.5V
Voltage - Clamping (Max) @ Ipp: 12.9V
Current - Peak Pulse (10/1000µs): 46.5A minimum
Package / Case: DO-214AA (SMB) or equivalent surface mount package
Unidirectional Channels: 1

Direct Equivalents maintain all critical electrical parameters and use the SMB (DO-214AA) package. These parts are functionally interchangeable with the 1SMB7.5AT3.

Similar Equivalents maintain the same voltage and current ratings but may use alternative surface mount packages (SOD-128) or have minor variations in peak pulse current (±0.1A tolerance). These require package compatibility verification during board redesign.

Non-Equivalent Parts (such as 1SMB5952BT3G and SMBJ7.5E3/TR13) are included in the dataset but do not meet substitution criteria due to different voltage ratings or clamping characteristics and are excluded from direct substitution consideration.

Parameter Comparison

Part Number	Manufacturer	Vr (Typ) [V]	Vc (Max) @ Ipp [V]	Ipp (10/1000µs) [A]	Package	Product Status	RoHS Status
1SMB7.5AT3	onsemi	7.5	12.9	46.5	DO-214AA, SMB	Obsolete	Non-compliant
SMBJ7.5A	MDD	7.5	12.9	46.6	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ7.5A-13-F	Diodes Incorporated	7.5	12.9	46.5	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ7.5A-HR	Littelfuse Inc.	7.5	12.9	46.6	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ7.5A-HRA	Littelfuse Inc.	7.5	12.9	46.6	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ7.5AE3/TR13	Microchip Technology	7.5	12.9	46.5	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ7V5A	Taiwan Semiconductor Corporation	7.5	12.9	46.5	DO-214AA, SMB	Active	ROHS3 Compliant
PTVS7V5P1UP,115	Nexperia USA Inc.	7.5	12.9	46.5	SOD-128	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct SMB Package Substitutes (Recommended for Pin-Compatible Replacement):

SMBJ7.5A (MDD), SMBJ7.5A-13-F (Diodes Incorporated), SMBJ7.5A-HR (Littelfuse Inc.), SMBJ7.5A-HRA (Littelfuse Inc.), SMBJ7.5AE3/TR13 (Microchip Technology), and SMBJ7V5A (Taiwan Semiconductor Corporation) are all active products with ROHS3 compliance. These parts maintain identical electrical specifications and the DO-214AA (SMB) package footprint, enabling direct substitution without PCB redesign.

Alternative Package Substitute (Requires Board Layout Modification):

PTVS7V5P1UP,115 (Nexperia USA Inc.) provides equivalent electrical performance with identical voltage and current ratings but uses the SOD-128 package. This part is AEC-Q101 qualified and suitable for automotive applications. Board layout modification is required for package transition.

Compliance Consideration:

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability compared to the obsolete 1SMB7.5AT3.

Frequently Asked Questions (FAQ)

Q: Can SMBJ7.5A (MDD) directly replace 1SMB7.5AT3 without PCB modification?

A: Yes. SMBJ7.5A maintains identical reverse standoff voltage (7.5V), clamping voltage (12.9V), peak pulse current (46.6A), and DO-214AA (SMB) package footprint. No PCB redesign is required.

Q: What is the difference between SMBJ7.5A-HR and SMBJ7.5A-HRA?

A: Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications (7.5V standoff, 12.9V clamping, 46.6A peak pulse). The "-HRA" designation indicates a variant within the SMBJ-HRA series. Electrical performance is equivalent for substitution purposes.

Q: Why is PTVS7V5P1UP,115 listed as a similar equivalent rather than a direct substitute?

A: PTVS7V5P1UP,115 uses the SOD-128 package instead of DO-214AA (SMB). While electrical parameters are identical, the different package requires PCB layout modification. This part is suitable for new designs or redesigns where package flexibility exists.

Q: Are all recommended substitutes suitable for the same temperature range as 1SMB7.5AT3?

A: The 1SMB7.5AT3 operates from -65°C to 150°C (TJ). Most substitutes operate from -55°C to 150°C or -65°C to 150°C. Verify the specific operating temperature requirement for your application before final selection.

Q: What is the inventory status of these substitute parts?

A: SMBJ7.5A (MDD) has 22,713 pcs in stock. SMBJ7.5A-13-F (Diodes Incorporated) has 24,100 pcs. SMBJ7.5AE3/TR13 (Microchip Technology) has 4,300 pcs. SMBJ7V5A (Taiwan Semiconductor Corporation) has 21,400 pcs. All are readily available for procurement.

Q: Is RoHS compliance a critical factor for selecting a substitute?

A: Yes. All recommended active substitutes are ROHS3 compliant, whereas the original 1SMB7.5AT3 is RoHS non-compliant. For new designs or compliance-driven applications, ROHS3-compliant substitutes are required.

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