SMBJ48C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ48C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 48V reverse standoff voltage with an 81.27V maximum clamping voltage and 7.8A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ48C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and power dissipation specifications while supporting the same surface-mount package format.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	48	V
Breakdown Voltage (Min)	50.49	V
Clamping Voltage (Max) @ Ipp	81.27	V
Peak Pulse Current (10/1000µs)	7.8	A
Peak Pulse Power	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ48C are qualified based on the following electrical and mechanical criteria:

Reverse standoff voltage of 48V (nominal)
Breakdown voltage minimum of 50.49V or higher
Clamping voltage maximum between 77.4V and 81.27V
Peak pulse current of 7.7A to 8.1A
Peak pulse power of 600W
Surface-mount package format (DO-214AA / SMB)
Bidirectional, single-channel configuration
RoHS3 compliance and MSL 1 rating

All substitute parts listed maintain these core electrical parameters within acceptable tolerances for direct replacement in the same circuit application. Variations in operating temperature range and specific manufacturer certifications (such as AEC-Q101 for automotive-grade variants) are noted but do not preclude substitution for general-purpose applications.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Product Status
SMBJ48C	Littelfuse Inc.	48	50.49	81.27	7.8	600	DO-214AA (SMBJ)	Obsolete
SMBJ48CA	MDD	48	53.3	77.4	7.8	600	SMB/DO-214AA	Active
SZ1SMB48CAT3G	Littelfuse Inc.	48	53.3	77.4	7.7	600	SMB	Active
SMBJ48CA-13-F	Diodes Incorporated	48	53.3	77.4	7.7	600	SMB	Active
SMBJ48CA-E3/5B	Vishay General Semiconductor - Diodes Division	48	53.3	77.4	7.8	600	DO-214AA (SMBJ)	Active
SMBJ48CA-TP	Micro Commercial Co	48	53.3	77.4	7.7	600	DO-214AA (SMB)	Active
SMBJ48CA-TR	STMicroelectronics	48	53.3	77.4	8.1	600	SMB (DO-214AA)	Active
TV06B480JB-G	Comchip Technology	48	53.3	77.4	7.75	600	DO-214AA (SMB)	Active
TV06B480JB-HF	Comchip Technology	48	53.3	77.4	7.75	600	DO-214AA (SMB)	Active

Engineering Selection Recommendations

All listed substitute parts are active products with RoHS3 compliance and MSL 1 moisture sensitivity ratings, ensuring long-term availability and environmental regulatory compliance. The SMBJ48CA (MDD), SMBJ48CA-E3/5B (Vishay), and SMBJ48CA-TR (STMicroelectronics) are primary substitutes, offering direct electrical equivalence with established supply chain presence. The SZ1SMB48CAT3G from Littelfuse Inc. provides automotive-grade qualification (AEC-Q101) for applications requiring enhanced reliability standards. Comchip Technology variants (TV06B480JB-G and TV06B480JB-HF) offer alternative sourcing with equivalent electrical performance. Selection should prioritize active-status parts from established manufacturers to ensure consistent availability and quality assurance for production environments.

Frequently Asked Questions (FAQ)

Q: Can SMBJ48CA directly replace SMBJ48C in existing designs?

A: Yes. Both parts maintain 48V reverse standoff voltage, 600W peak pulse power, and DO-214AA/SMB package compatibility. The SMBJ48CA exhibits a lower maximum clamping voltage (77.4V vs. 81.27V), which provides improved protection margins in most general-purpose applications.

Q: What is the difference between clamping voltage specifications across substitute parts?

A: The original SMBJ48C specifies 81.27V maximum clamping voltage. All active substitutes specify 77.4V maximum clamping voltage. This 3.87V difference represents tighter clamping performance and is acceptable for general-purpose transient suppression where lower clamping voltages enhance circuit protection.

Q: Are there temperature range differences between substitute parts?

A: Yes. The SMBJ48C operates from -65°C to 150°C. Most substitutes operate within -55°C to 150°C or -50°C to 150°C ranges. The SMBJ48CA-TP extends to 175°C maximum. Verify application temperature requirements before selection.

Q: Does package designation affect substitutability?

A: No. All parts use DO-214AA or SMB package designations, which are equivalent surface-mount formats. Footprint compatibility is maintained across all listed substitutes.

Q: Which substitute offers the best supply availability?

A: SMBJ48CA (MDD) and SZ1SMB48CAT3G (Littelfuse Inc.) show the highest inventory levels (5,539 and 9,593 units respectively) among active alternatives, supporting consistent procurement for production volumes.

Q: Is automotive qualification required for general-purpose applications?

A: No. Automotive qualification (AEC-Q101) is optional for general-purpose applications. The SZ1SMB48CAT3G provides this certification for designs requiring enhanced reliability, but standard industrial-grade parts are sufficient for non-automotive use.

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