1SMB75CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB75CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 75V reverse standoff voltage with 121V maximum clamping voltage and 4.9A peak pulse current capability in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB75CAT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	75V
Voltage - Breakdown (Min)	83.3V
Voltage - Clamping (Max) @ Ipp	121V
Current - Peak Pulse (10/1000µs)	4.9A
Power - Peak Pulse	600W
Operating Temperature	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the 1SMB75CAT3 is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 75V
Voltage - Clamping (Max) @ Ipp: 121V
Voltage - Breakdown (Min): 83.3V
Current - Peak Pulse (10/1000µs): 4.9A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Bidirectional Channels: 1
Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Electrical Specifications): Parts that match all critical voltage, current, and power parameters with identical or superior performance characteristics.

Similar Substitutes (Compatible Electrical Specifications): Parts that meet or exceed the core protection parameters (voltage standoff, clamping voltage, breakdown voltage) with peak pulse current ratings at or above 4.9A, ensuring functional equivalence in circuit protection applications.

Parameter Comparison

Parameter	1SMB75CAT3 (Main)	SMBJ75CA (MDD)	SMBJ75CA-13-F (Diodes Inc.)	SMBJ75CA-HR (Littelfuse)	SMBJ75CA-HRA (Littelfuse)	SMBJ75CA-M3/52 (Vishay)	SMBJ75CA-M3/5B (Vishay)	SMBJ75CA-TP (MCC)
Voltage - Reverse Standoff (Typ)	75V	75V	75V	75V	75V	75V	75V	75V
Voltage - Breakdown (Min)	83.3V	83.3V	83.3V	83.3V	83.3V	83.3V	83.3V	83.3V
Voltage - Clamping (Max) @ Ipp	121V	121V	121V	121V	121V	121V	121V	121V
Current - Peak Pulse (10/1000µs)	4.9A	5.3A	4.9A	5A	5A	5A	5A	4.9A
Power - Peak Pulse	600W	600W	600W	600W	600W	600W	600W	600W
Operating Temperature	-65°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active production components with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original 1SMB75CAT3. Selection among substitutes should be based on the following factors:

Direct Electrical Equivalence: SMBJ75CA (MDD), SMBJ75CA-13-F (Diodes Incorporated), SMBJ75CA-TP (Micro Commercial Co), SMBJ75CA-HR (Littelfuse), SMBJ75CA-HRA (Littelfuse), SMBJ75CA-M3/52 (Vishay), and SMBJ75CA-M3/5B (Vishay) all meet or exceed the electrical specifications of the 1SMB75CAT3 with identical voltage parameters and compatible peak pulse current ratings.

Temperature Range Considerations: SMBJ75CA-HR and SMBJ75CA-HRA maintain the full -65°C to 150°C operating range of the original part. SMBJ75CA-TP extends the upper temperature limit to 175°C, providing enhanced thermal margin. SMBJ75CA (MDD) operates from -50°C, which may be limiting in extreme cold environments.

Regulatory Compliance: All substitute parts carry ROHS3 compliance certification, meeting modern environmental and regulatory requirements that the obsolete 1SMB75CAT3 does not satisfy.

Availability and Inventory: SMBJ75CA (MDD) offers the highest inventory availability at 45,300 pieces, followed by SMBJ75CA-13-F (Diodes Incorporated) at 29,300 pieces, providing supply chain stability for production volumes.

Frequently Asked Questions (FAQ)

Q: Can SMBJ75CA (MDD) be used as a direct replacement for 1SMB75CAT3?

A: Yes. SMBJ75CA matches all critical electrical parameters: 75V reverse standoff, 83.3V minimum breakdown, 121V maximum clamping voltage, and 5.3A peak pulse current (exceeding the 4.9A requirement). Both use DO-214AA (SMB) surface mount packaging. The primary difference is the operating temperature range (-50°C to 150°C versus -65°C to 150°C), which is acceptable for most applications operating above -50°C.

Q: What is the difference between SMBJ75CA-HR and SMBJ75CA-HRA?

A: Both parts are manufactured by Littelfuse with identical electrical specifications and operating temperature range (-65°C to 150°C). The designation difference reflects internal Littelfuse product line variations. Either part provides equivalent protection and can be selected based on availability or supply chain preference.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original 1SMB75CAT3 is RoHS non-compliant, making substitution necessary for applications requiring regulatory compliance.

Q: Does package compatibility require any PCB layout changes?

A: No. All substitute parts use the DO-214AA (SMB) surface mount package, identical to the 1SMB75CAT3. PCB footprints, solder pad dimensions, and mounting procedures remain unchanged.

Q: Which substitute offers the best thermal performance?

A: SMBJ75CA-TP (Micro Commercial Co) extends the operating temperature range to -55°C to 175°C, providing the highest upper temperature limit among all substitutes. This offers additional thermal margin for applications in elevated temperature environments.

Q: Can I use 1SMB5951BT3G as a substitute?

A: No. While 1SMB5951BT3G is a zener diode in SMB packaging, it is categorized as a general-purpose zener diode (120V, 3W) rather than a transient voltage suppressor. TVS diodes and zener diodes have different response characteristics and are not interchangeable for transient protection applications.

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