SMCJ48C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMCJ48C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 48V reverse standoff voltage with an 81.27V maximum clamping voltage and 19.4A peak pulse current capability in a surface-mount DO-214AB (SMC) package. The SMCJ48C is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (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
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMCJ48C is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 48V
Package / Case: DO-214AB, SMC (surface mount)
Mounting Type: Surface Mount
Type: Zener, Bidirectional
Bidirectional Channels: 1

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: Substitute parts may exhibit clamping voltages between 77.4V and 85.5V, representing acceptable performance variation within the TVS diode category
Current - Peak Pulse (10/1000µs): Substitute parts range from 17.5A to 64.7A; higher current ratings provide enhanced transient suppression capability
Power - Peak Pulse: Substitute parts range from 1500W to 5000W; higher power ratings indicate improved thermal dissipation
Operating Temperature Range: Substitute parts maintain minimum -55°C lower bound; upper bounds range from 150°C to 175°C

All substitute parts maintain RoHS3 compliance, MSL Level 1 (Unlimited), and identical ECCN/HTSUS classifications as the original component.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status
SMCJ48C	Littelfuse Inc.	48	81.27	19.4	1500	-55 to 150	Obsolete
SMCJ48CA	Fairchild Semiconductor	48	77.4	19.4	1500	-55 to 150	Active
SMCJ48CA-13-F	Diodes Incorporated	48	77.4	19.4	1500	-55 to 150	Active
SMCJ48CAE3/TR13	Microchip Technology	48	77.4	19.4	1500	-65 to 150	Active
SMCJ48CE3/TR13	Microchip Technology	48	85.5	17.5	1500	-65 to 150	Active
SMLJ48CA	Bourns Inc.	48	77.4	38.8	3000	-55 to 150	Active
SMLJ48CA-TP	Micro Commercial Co	48	77.4	38.8	3000	-55 to 175	Active
SMC3K48CA-M3/57	Vishay General Semiconductor - Diodes Division	48	77.4	38.8	3000	-55 to 150	Active
5.0SMLJ48CA-TP	Micro Commercial Co	48	77.4	64.7	5000	-55 to 175	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Current Rating): SMCJ48CA (Fairchild Semiconductor), SMCJ48CA-13-F (Diodes Incorporated), SMCJ48CAE3/TR13 (Microchip Technology), and SMCJ48CE3/TR13 (Microchip Technology) provide direct functional replacement with 19.4A peak pulse current matching the original SMCJ48C specification. These components are active products with full RoHS3 compliance and unlimited moisture sensitivity level. SMCJ48CAE3/TR13 and SMCJ48CE3/TR13 extend the lower operating temperature limit to -65°C, providing enhanced cold-temperature performance.

Enhanced Performance Alternatives (Higher Current Rating): SMLJ48CA (Bourns Inc.), SMLJ48CA-TP (Micro Commercial Co), and SMC3K48CA-M3/57 (Vishay General Semiconductor - Diodes Division) deliver 38.8A peak pulse current with 3000W peak pulse power, doubling the transient suppression capability. SMLJ48CA-TP additionally supports extended operating temperature to 175°C. These components are suitable for applications requiring superior transient protection margin.

Maximum Performance Alternative: 5.0SMLJ48CA-TP (Micro Commercial Co) provides the highest performance specification with 64.7A peak pulse current and 5000W peak pulse power, enabling robust protection in high-energy transient environments. This component maintains -55 to 175°C operating temperature range and active product status.

All substitute parts maintain identical 48V reverse standoff voltage, DO-214AB (SMC) package configuration, surface-mount compatibility, and RoHS3 compliance required for direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can SMCJ48CA directly replace SMCJ48C without circuit modification? A: Yes. SMCJ48CA maintains identical reverse standoff voltage (48V), peak pulse current (19.4A), power rating (1500W), and DO-214AB package configuration. Direct substitution is supported without circuit redesign.

Q: What is the difference between SMCJ48CA and SMLJ48CA? A: Both components share the 48V reverse standoff voltage and DO-214AB package. SMLJ48CA provides doubled peak pulse current (38.8A versus 19.4A) and tripled power dissipation (3000W versus 1500W), enabling enhanced transient suppression. Selection depends on application transient energy requirements.

Q: Are there temperature range differences between substitute options? A: Yes. Standard options (SMCJ48CA, SMCJ48CA-13-F, SMLJ48CA, SMC3K48CA-M3/57) operate -55 to 150°C. Microchip variants (SMCJ48CAE3/TR13, SMCJ48CE3/TR13) extend to -65°C minimum. SMLJ48CA-TP and 5.0SMLJ48CA-TP extend to 175°C maximum. Selection should align with application thermal environment.

Q: What does the clamping voltage variation (77.4V to 85.5V) indicate? A: Clamping voltage represents the maximum voltage across the TVS diode during transient suppression. Variation within this range reflects normal manufacturing tolerance and different device designs. All values remain within acceptable suppression performance for 48V standoff applications.

Q: Is packaging identical across all substitute parts? A: Yes. All substitute parts utilize DO-214AB (SMC) surface-mount package, ensuring identical PCB footprint and reflow soldering compatibility. Tape & Reel packaging variants (indicated by -TP or /TR13 designations) represent supply format only, not physical package differences.

Q: Which substitute offers the best cost-to-performance ratio for general-purpose applications? A: SMCJ48CA (Fairchild Semiconductor) and SMCJ48CA-13-F (Diodes Incorporated) provide direct electrical equivalence with highest inventory availability and active product status, supporting optimal procurement economics for standard applications.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance, MSL Level 1 (Unlimited), and identical ECCN/HTSUS classifications as the original SMCJ48C component.

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