SMDJ48 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMDJ48 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. Housed in the DO-214AB (SMC) package, this component operates across a temperature range of -65°C to 150°C and is RoHS3 compliant. The SMDJ48 is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and production continuity.

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)	38.8	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMDJ48 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: Range 77.4V to 81.27V
Current - Peak Pulse (10/1000µs): 19.4A to 38.8A
Power - Peak Pulse: 1500W to 3000W
Operating Temperature Range: Minimum -55°C, Maximum 150°C or higher

Substitute parts must maintain the 48V standoff voltage specification and unidirectional topology. Clamping voltage, peak pulse current, and power dissipation may vary within the specified ranges depending on application requirements. All substitute parts listed are active products with current manufacturing status and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Package	Product Status
SMDJ48	Littelfuse Inc.	48	81.27	38.8	3000	-65 to 150	DO-214AB, SMC	Obsolete
SMDJ48A	Alpha & Omega Semiconductor Inc.	48	77.4	38.8	3000	-55 to 150	DO-214AB, SMC	Active
SMCJ48A	MDD	48	77.4	19.4	1500	-50 to 150	DO-214AB, SMC	Active
SMCJ48A-TP	Micro Commercial Co	48	77.4	19.4	1500	-55 to 175	DO-214AB, SMC	Active
SMCJ48AE3/TR13	Microchip Technology	48	77.4	19.4	1500	-65 to 150	DO-214AB, SMC	Active
SMLJ48A	Bourns Inc.	48	77.4	38.8	3000	-55 to 150	DO-214AB, SMC	Active
SMLJ48A-TP	Micro Commercial Co	48	77.4	38.8	3000	-55 to 175	DO-214AB, SMC	Active
SMLJ48AE3/TR13	Microchip Technology	48	77.4	38.8	300	-55 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

Full Power Rating Equivalents (3000W): SMDJ48A, SMLJ48A, SMLJ48A-TP, and SMLJ48AE3/TR13 maintain the original 3000W peak pulse power specification with 38.8A peak pulse current. These parts are direct functional replacements for applications requiring maximum transient energy absorption. SMLJ48A (Bourns Inc.) offers the highest inventory availability at 22,710 units. SMLJ48A-TP (Micro Commercial Co) extends the operating temperature range to 175°C.

Reduced Power Rating Alternatives (1500W): SMCJ48A, SMCJ48A-TP, and SMCJ48AE3/TR13 operate at 1500W peak pulse power with 19.4A peak pulse current. These parts are suitable for applications with lower transient energy requirements or where thermal constraints permit reduced power dissipation. SMCJ48A (MDD) provides the largest inventory stock at 16,125 units.

Compliance and Certification: All substitute parts are RoHS3 compliant and carry REACH Unaffected or REACH Affected status. SMCJ48AE3/TR13 and SMLJ48AE3/TR13 (Microchip Technology) maintain the original -65°C lower temperature limit, matching the SMDJ48 specification. SMCJ48A-TP and SMLJ48A-TP (Micro Commercial Co) extend the upper operating temperature to 175°C, providing enhanced thermal margin for high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can SMCJ48A replace SMDJ48 in all applications? A: SMCJ48A is electrically compatible at the 48V standoff voltage and maintains the same package. However, it operates at 1500W peak pulse power versus the original 3000W specification. Use SMCJ48A only if your application's transient energy requirements do not exceed 1500W. For full power equivalence, select SMDJ48A, SMLJ48A, SMLJ48A-TP, or SMLJ48AE3/TR13.

Q: What is the difference between SMLJ48A and SMDJ48A? A: Both parts maintain 48V standoff voltage, 38.8A peak pulse current, and 3000W power rating. SMLJ48A is manufactured by Bourns Inc. with higher inventory availability (22,710 units). SMDJ48A is from Alpha & Omega Semiconductor Inc. with 1,320 units in stock. Electrical performance is equivalent; selection may be based on supplier preference or availability.

Q: Are tape and reel (TR) packaged parts functionally identical to bulk packaged parts? A: Yes. Tape and reel packaging (indicated by -TP or /TR13 suffixes) contains the same die and electrical characteristics as bulk packaged equivalents. The packaging format affects handling and assembly automation compatibility, not electrical performance. SMLJ48A-TP and SMLJ48AE3/TR13 are functionally equivalent to SMLJ48A.

Q: Which substitute offers the widest operating temperature range? A: SMCJ48A-TP and SMLJ48A-TP (Micro Commercial Co) extend the upper operating temperature to 175°C, compared to 150°C for most alternatives. For applications requiring operation above 150°C, these parts provide additional thermal margin.

Q: Is SMLJ48AE3/TR13 a full equivalent to SMDJ48? A: SMLJ48AE3/TR13 matches the 48V standoff voltage, 38.8A peak pulse current, and -65°C lower temperature limit. However, it specifies 300W peak pulse power, not 3000W. This part is not suitable as a direct replacement for the original SMDJ48 in applications requiring full 3000W transient energy absorption.

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