SMCJ48 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMCJ48 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection in surface-mount applications. The device features a 48V reverse standoff voltage rating and 1500W peak pulse power handling capability in a DO-214AB (SMC) package. The SMCJ48 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	48	V
Voltage - Breakdown (Min)	50.49	V
Voltage - Clamping (Max) @ Ipp	81.27	V
Current - Peak Pulse (10/1000µs)	19.4	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMCJ48 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 48V (nominal)
Voltage breakdown minimum: 50.49V to 53.3V range
Peak pulse current: 18A to 19.4A
Peak pulse power: 1500W
Package: DO-214AB (SMC) surface mount
Unidirectional configuration (single channel)
Operating temperature range: minimum -55°C to -50°C, maximum 150°C

Secondary Compatibility Factors:

Clamping voltage tolerance (77.4V to 85.5V acceptable within application limits)
RoHS3 compliance for commercial applications
Moisture sensitivity level MSL 1 (unlimited shelf life)

Substitute parts are grouped into three categories: direct equivalents (matching all primary criteria), active commercial alternatives (different manufacturers, equivalent performance), and military-grade upgrades (enhanced temperature range and MIL-PRF-19500 qualification).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vwm (V)	Vbr Min (V)	Vc Max @ Ipp (V)	Ipp (A)	Tj Range (°C)	Package	Product Status	RoHS Status
SMCJ48	Littelfuse	48	50.49	81.27	19.4	-55 to 150	DO-214AB (SMCJ)	Obsolete	ROHS3 Compliant
SMCJ48A	MDD	48	53.3	77.4	19.4	-50 to 150	DO-214AB (SMC)	Active	ROHS3 Compliant
SMCJ48	Taiwan Semiconductor Corporation	48	53.3	85.5	18	-55 to 150	DO-214AB (SMC)	Active	ROHS3 Compliant
SMCJ48A-E3/57T	Vishay General Semiconductor - Diodes Division	48	53.3	77.4	19.4	-55 to 150	DO-214AB (SMCJ)	Active	ROHS3 Compliant
SMCJ48A-E3/9AT	Vishay General Semiconductor - Diodes Division	48	53.3	77.4	19.4	-55 to 150	DO-214AB (SMCJ)	Active	ROHS3 Compliant
SMCJ48A-M3/9AT	Vishay General Semiconductor - Diodes Division	48	53.3	77.4	19.4	-55 to 150	DO-214AB (SMC)	Active	ROHS3 Compliant
TV15C480J-HF	Comchip Technology	48	53.3	77.4	19.38	-55 to 150	DO-214AB (SMC)	Active	ROHS3 Compliant
MASMCJ48AE3	Microchip Technology	48	53.3	77.4	19.4	-65 to 150	DO-214AB (SMCJ)	Active	RoHS non-compliant
MSMCJ48AE3	Microchip Technology	48	53.3	77.4	19.4	-65 to 150	DO-214AB (SMCJ)	Active	RoHS non-compliant
SMCJ48AE3/TR13	Microchip Technology	48	53.3	77.4	19.4	-65 to 150	DO-214AB (SMCJ)	Active	ROHS3 Compliant
SMCJ48E3/TR13	Microchip Technology	48	53.3	85.5	17.5	-65 to 150	DO-214AB (SMCJ)	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Commercial Applications (RoHS3 Compliant Required):

Direct substitutes with full RoHS3 compliance and active product status include SMCJ48A-E3/57T, SMCJ48A-E3/9AT, SMCJ48A-M3/9AT (Vishay), TV15C480J-HF (Comchip), and SMCJ48AE3/TR13 (Microchip). These parts maintain the 48V standoff voltage, 1500W peak pulse power, and DO-214AB package compatibility. The Vishay TransZorb® series parts offer clamping voltage of 77.4V with 19.4A peak pulse current across the full -55°C to 150°C temperature range.

For Extended Temperature Applications:

SMCJ48AE3/TR13 and SMCJ48E3/TR13 (Microchip) extend the operating temperature range to -65°C to 150°C while maintaining RoHS3 compliance and active product status. SMCJ48E3/TR13 provides higher clamping voltage (85.5V) with slightly reduced peak pulse current (17.5A), suitable for applications requiring enhanced low-temperature performance.

For Military or High-Reliability Applications:

MASMCJ48AE3 and MSMCJ48AE3 (Microchip) offer MIL-PRF-19500 qualification and military-grade specifications with -65°C to 150°C operating range. These parts are RoHS non-compliant but provide enhanced reliability for defense and aerospace applications.

Clamping Voltage Consideration:

The original SMCJ48 specifies 81.27V maximum clamping voltage. Most active substitutes (SMCJ48A series, TV15C480J-HF, Microchip SMCJ48AE3/TR13) provide 77.4V clamping, which is acceptable for general-purpose transient suppression. SMCJ48E3/TR13 and Taiwan Semiconductor SMCJ48 provide 85.5V clamping, closer to the original specification.

Frequently Asked Questions (FAQ)

Q: Can SMCJ48A replace the obsolete SMCJ48 directly?

A: Yes, SMCJ48A from MDD is a direct commercial substitute with matching 48V standoff voltage, 19.4A peak pulse current, and 1500W power rating in DO-214AB package. The primary difference is the reduced minimum operating temperature (-50°C vs. -55°C). For applications operating above -50°C, this substitution is fully compatible.

Q: What is the difference between Vishay SMCJ48A-E3/57T and SMCJ48A-E3/9AT?

A: Both parts are electrically identical with 48V standoff, 77.4V clamping, 19.4A peak pulse current, and -55°C to 150°C operating range in DO-214AB package. The suffix designations (E3/57T vs. E3/9AT) indicate different packaging configurations or tape specifications. Selection depends on procurement and assembly requirements.

Q: Why do some substitutes show lower peak pulse current (18A vs. 19.4A)?

A: Taiwan Semiconductor SMCJ48 specifies 18A peak pulse current while maintaining 1500W peak pulse power and 48V standoff voltage. This represents a valid alternative within the same power class. The slightly lower current rating reflects different device design characteristics while maintaining equivalent transient suppression capability for the 48V protection class.

Q: Are Microchip military-grade parts (MASMCJ48AE3, MSMCJ48AE3) suitable for commercial applications?

A: These parts meet the electrical requirements for 48V transient suppression but are RoHS non-compliant. They are specified for military applications with MIL-PRF-19500 qualification. For commercial applications requiring RoHS3 compliance, use SMCJ48AE3/TR13 or SMCJ48E3/TR13 instead.

Q: What is the significance of the -65°C lower temperature limit in Microchip parts?

A: Microchip SMCJ48AE3/TR13, SMCJ48E3/TR13, MASMCJ48AE3, and MSMCJ48AE3 extend the minimum operating temperature to -65°C compared to -55°C in the original SMCJ48. This provides enhanced performance in extreme cold environments. For standard commercial applications operating above -55°C, this extended range is not required.

Q: Can I use TV15C480J-HF (Comchip) as a substitute?

A: Yes, TV15C480J-HF is a direct substitute with 48V standoff voltage, 77.4V clamping, 19.38A peak pulse current (equivalent to 19.4A), 1500W power rating, and -55°C to 150°C operating range in DO-214AB package. RoHS3 compliance and active product status make it suitable for commercial applications.

Q: What packaging options are available for substitutes?

A: All substitute parts maintain the DO-214AB (SMC) surface-mount package for direct PCB compatibility. Packaging formats vary: Tape & Reel (TR) for automated assembly, and Bulk for manual assembly. Verify packaging specification with your procurement requirements before ordering.

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