1SMB48CAT3G Equivalent & Substitute Parts

Part Overview

The 1SMB48CAT3G is a 48V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface mount applications. This component features a 77.4V maximum clamping voltage, 7.7A peak pulse current rating, and 600W peak pulse power dissipation capability in a DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	48	V
Voltage - Breakdown (Min)	53.3	V
Voltage - Clamping (Max) @ Ipp	77.4	V
Current - Peak Pulse (10/1000µs)	7.7	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C ~ 150°C	TJ
Bidirectional Channels	1	—
Applications	General Purpose	—

Substitute Part Grouping Explanation

Substitution of the 1SMB48CAT3G is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 48V
Voltage - Breakdown (Min): 53.3V
Voltage - Clamping (Max) @ Ipp: 77.4V
Current - Peak Pulse (10/1000µs): 7.7A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
Applications: General Purpose

Substitute parts are grouped into two categories: MFR Recommended alternatives (manufacturer-endorsed direct replacements) and Direct alternatives (functionally equivalent parts from other manufacturers). All listed substitutes maintain the core electrical specifications within acceptable engineering tolerances and share identical package geometry and mounting characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Breakdown Min (V)	Clamp Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Temp Range (°C)	Status
1SMB48CAT3G	Littelfuse	48	53.3	77.4	7.7	600	DO-214AA, SMB	-65 ~ 150	Obsolete
SMBJ48CA	MDD	48	53.3	77.4	7.8	600	DO-214AA, SMB	-50 ~ 150	Active
SMBJ48CA-HR	Littelfuse Inc.	48	53.3	77.4	7.8	600	DO-214AA, SMB	-65 ~ 150	Active
SMBJ48CA-HRA	Littelfuse	48	53.3	77.4	7.8	600	DO-214AA, SMB	-65 ~ 150	Active
TV06B480JB-G	Comchip Technology	48	53.3	77.4	7.75	600	DO-214AA, SMB	Not specified	Active
SMBJ48CA-13	Diodes Incorporated	48	53.3	77.4	7.7	600	DO-214AA, SMB	-55 ~ 150	Discontinued
SMBJ48CA-13-F	Diodes Incorporated	48	53.3	77.4	7.7	600	DO-214AA, SMB	-55 ~ 150	Active
SMBJ48CA-TP	Micro Commercial Co	48	53.3	77.4	7.7	600	DO-214AA, SMB	-55 ~ 175	Active
SMBJ48CA-TR	STMicroelectronics	48	53.3	77.4	8.1	600	DO-214AA, SMB	-55 ~ 150	Active

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 1SMB48CAT3G, the following selection criteria apply:

Primary Recommendation: SMBJ48CA-HR or SMBJ48CA-HRA (Littelfuse Inc.) are preferred substitutes, as they are manufactured by the original component supplier, maintain identical electrical specifications, preserve the full operating temperature range (-65°C ~ 150°C), and carry Active product status with ROHS3 compliance certification.

Secondary Recommendations: SMBJ48CA-13-F (Diodes Incorporated), SMBJ48CA-TP (Micro Commercial Co), and SMBJ48CA-TR (STMicroelectronics) are functionally equivalent alternatives with Active status and ROHS3 compliance. These parts maintain all critical electrical parameters and DO-214AA package geometry. Operating temperature ranges vary slightly (-55°C ~ 150°C or -55°C ~ 175°C), which may be acceptable depending on application thermal requirements.

Alternative Option: SMBJ48CA (MDD) is an active substitute with equivalent electrical performance and ROHS3 compliance, though the operating temperature range is reduced to -50°C ~ 150°C.

Not Recommended: SMBJ48CA-13 (Diodes Incorporated) is discontinued at DiGi Electronics and carries RoHS non-compliant status, making it unsuitable for new designs.

Not Recommended: TV06B480JB-G (Comchip Technology) lacks specified operating temperature range data, introducing uncertainty in thermal performance characterization.

Frequently Asked Questions (FAQ)

Q: Can SMBJ48CA-HR be used as a direct replacement for 1SMB48CAT3G?

A: Yes. SMBJ48CA-HR maintains identical electrical specifications (48V standoff, 53.3V breakdown minimum, 77.4V clamping maximum, 7.8A peak pulse current, 600W peak power), shares the DO-214AA (SMB) package geometry, and preserves the full operating temperature range (-65°C ~ 150°C). Both are manufactured by Littelfuse and carry ROHS3 compliance.

Q: What is the difference between SMBJ48CA-HR and SMBJ48CA-HRA?

A: Both parts are manufactured by Littelfuse with identical electrical and thermal specifications. The designation difference reflects internal product line categorization. Both are suitable substitutes for the 1SMB48CAT3G.

Q: Are there any temperature range limitations when substituting with SMBJ48CA (MDD)?

A: SMBJ48CA operates over -50°C ~ 150°C, compared to the original part's -65°C ~ 150°C range. Applications requiring operation below -50°C ambient temperature should select SMBJ48CA-HR, SMBJ48CA-HRA, or other alternatives with extended low-temperature ratings.

Q: Can SMBJ48CA-TP be used in high-temperature applications?

A: SMBJ48CA-TP supports an operating temperature range of -55°C ~ 175°C, extending 25°C above the original 1SMB48CAT3G specification. This part is suitable for applications requiring elevated temperature performance while maintaining all electrical equivalence criteria.

Q: What packaging options are available for these substitutes?

A: All substitute parts use the DO-214AA (SMB) surface mount package, identical to the original 1SMB48CAT3G. Packaging variants (Tape & Reel, Cut Tape, or bulk) are available depending on the specific part number suffix and manufacturer. Verify packaging requirements with your supplier.

Q: Are all recommended substitutes RoHS compliant?

A: All active substitute parts listed carry ROHS3 compliance certification. SMBJ48CA-13 is RoHS non-compliant and is not recommended for new designs.

Q: What is the peak pulse current tolerance across substitute parts?

A: Peak pulse current ratings range from 7.7A to 8.1A across the substitute list. All values meet or exceed the original 1SMB48CAT3G specification of 7.7A, ensuring equivalent or superior transient suppression performance.

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