1SMB28CAT3G Equivalent & Substitute Parts

Part Overview

The 1SMB28CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 28V reverse standoff voltage with a 45.4V clamping voltage and 13.2A 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	1SMB28CAT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V
Current - Peak Pulse (10/1000µs)	13.2A
Power - Peak Pulse	600W
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 1SMB28CAT3G is determined by strict equivalence across the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 28V
Voltage - Breakdown (Min): 31.1V
Voltage - Clamping (Max) @ Ipp: 45.4V
Current - Peak Pulse (10/1000µs): 13.2A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain these core electrical specifications within the defined tolerances. Variations in peak pulse current (13.2A to 13.8A) and operating temperature ranges are acceptable within the functional requirements of this TVS diode category. All substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
1SMB28CAT3G	Littelfuse Inc.	28V	31.1V	45.4V	13.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Obsolete
SMBJ28CA	MDD	28V	31.1V	45.4V	13.3A	600W	-50°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-HR	Littelfuse Inc.	28V	31.1V	45.4V	13.3A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-HRA	Littelfuse Inc.	28V	31.1V	45.4V	13.3A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
TV06B280JB-G	Comchip Technology	28V	31.1V	45.4V	13.22A	600W	Not specified	DO-214AA, SMB	Active
SMBJ28CA-13-F	Diodes Incorporated	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-M3/52	Vishay General Semiconductor - Diodes Division	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-M3/5B	Vishay General Semiconductor - Diodes Division	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-TP	Micro Commercial Co	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 175°C	DO-214AA, SMB	Active
SMBJ28CA-TR	STMicroelectronics	28V	31.1V	45.4V	13.8A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with modern manufacturing processes and long-term supply availability. The primary distinction between substitute options is manufacturer selection and operating temperature range.

For applications requiring the full -65°C lower temperature limit of the original 1SMB28CAT3G, select SMBJ28CA-HR or SMBJ28CA-HRA from Littelfuse Inc., which maintain the original temperature specification while offering active product status.

For general-purpose applications where the -50°C to -55°C lower temperature limit is acceptable, SMBJ28CA (MDD), SMBJ28CA-13-F (Diodes Incorporated), SMBJ28CA-M3/52 (Vishay), SMBJ28CA-M3/5B (Vishay), SMBJ28CA-TP (Micro Commercial Co), and SMBJ28CA-TR (STMicroelectronics) provide equivalent electrical performance with higher inventory availability.

SMBJ28CA-TP offers the widest operating temperature range (-55°C ~ 175°C), suitable for applications requiring extended high-temperature performance. SMBJ28CA-TR from STMicroelectronics provides the highest peak pulse current specification (13.8A), offering additional margin for transient suppression.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1SMB28CAT3G with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain identical voltage specifications (28V reverse standoff, 31.1V breakdown minimum, 45.4V clamping maximum) and equivalent peak pulse current ratings (13.2A to 13.8A). All are packaged in DO-214AA (SMB) surface mount format and are ROHS3 compliant with MSL 1 moisture sensitivity.

Q: What is the difference between SMBJ28CA-HR and SMBJ28CA-HRA?

A: Both parts are manufactured by Littelfuse Inc. and maintain identical electrical specifications and operating temperature range (-65°C ~ 150°C). The suffix designations indicate different packaging or tape configurations. Consult the respective datasheets for specific packaging details.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect electrical substitution compatibility if your application operates within the substitute part's specified range. If your design requires operation below -50°C, select SMBJ28CA-HR, SMBJ28CA-HRA, or TV06B280JB-G. For applications requiring operation above 150°C, SMBJ28CA-TP supports up to 175°C.

Q: Are there inventory considerations for substitute selection?

A: Yes. SMBJ28CA-TR (STMicroelectronics) and SMBJ28CA (MDD) offer the highest inventory levels (27,900 and 26,400 units respectively), providing supply chain advantages for high-volume production. SMBJ28CA-HRA and TV06B280JB-G have lower inventory (773 and 731 units), suitable for lower-volume applications.

Q: What is the significance of the peak pulse current variation (13.2A to 13.8A)?

A: All substitute parts exceed the original 1SMB28CAT3G specification of 13.2A peak pulse current. Higher peak pulse current ratings provide additional transient suppression margin without affecting circuit compatibility. This variation is within normal manufacturing tolerance for this component category.

Q: Are all substitute parts suitable for tape and reel packaging?

A: Most substitute parts are available in tape and reel (TR) or cut tape (CT) packaging for automated assembly. SMBJ28CA (MDD) packaging is not specified in the provided data. Confirm packaging availability with your component supplier for your specific assembly requirements.

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