SMDJ5.0 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMDJ5.0 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 5V reverse standoff voltage with a 9.66V maximum clamping voltage at peak pulse current of 326.1A, housed in a DO-214AB (SMC) package. The SMDJ5.0 is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	5	V
Voltage - Breakdown (Min)	6.03	V
Voltage - Clamping (Max) @ Ipp	9.66	V
Current - Peak Pulse (10/1000µs)	326.1	A
Power - Peak Pulse	3000	W
Type	Zener	-
Unidirectional Channels	1	-
Mounting Type	Surface Mount	-
Package / Case	DO-214AB, SMC	-
Operating Temperature Range	-65°C ~ 150°C	TJ
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the SMDJ5.0 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff: 5V (fixed requirement)
Voltage - Clamping (Max) @ Ipp: 9.2V to 9.66V (acceptable range for general-purpose protection)
Current - Peak Pulse (10/1000µs): 120A to 326.1A (dependent on application power dissipation requirements)
Power - Peak Pulse: 1500W to 3000W (correlates with current rating)
Type: Zener (unidirectional TVS diode)
Unidirectional Channels: 1

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount (required)
Package / Case: DO-214AB, SMC (required for PCB footprint compatibility)
Moisture Sensitivity Level: 1 (Unlimited) or equivalent

Compliance Requirements:

RoHS3 Compliant (mandatory for regulatory alignment)
Product Status: Active (preferred for production continuity)

Substitute parts are grouped into two categories based on peak pulse current and power dissipation capacity: full-capacity substitutes (326A, 3000W) and reduced-capacity substitutes (120A-163A, 1500W). Selection depends on the specific application's transient energy requirements.

Parameter Comparison

Manufacturer	Part Number	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	Operating Temp (°C)
Littelfuse Inc.	SMDJ5.0	5	9.66	326.1	3000	DO-214AB, SMC	Obsolete	-65 ~ 150
Alpha & Omega Semiconductor Inc.	SMDJ5.0A	5	9.2	326.1	3000	DO-214AB, SMC	Active	-55 ~ 150
Diodes Incorporated	3.0SMCJ5.0A-13	5	9.2	326.1	3000	DO-214AB, SMC	Active	-55 ~ 150
STMicroelectronics	SM5908	5	8.5	120	1500	DO-214AB, SMC	Active	-55 ~ 175
EVVO Semi	SMCJ5.0A	5	9.2	163	1500	DO-214AB, SMC	Active	-55 ~ 150
Micro Commercial Co	SMCJ5.0A-TP	5	9.2	163	1500	DO-214AB, SMC	Active	-55 ~ 175
Microchip Technology	SMCJ5.0AE3/TR13	5	9.2	163	1500	DO-214AB, SMC	Active	-65 ~ 150
Fairchild Semiconductor	SMCJ5V0A	5	9.2	163	1500	DO-214AB, SMC	Active	-
Bourns Inc.	SMLJ5.0A	5	9.2	326	3000	DO-214AB, SMC	Active	-55 ~ 150
Micro Commercial Co	SMLJ5.0A-TP	5	9.2	326	3000	DO-214AB, SMC	Active	-55 ~ 175

Engineering Selection Recommendations

Full-Capacity Substitutes (326A, 3000W): SMDJ5.0A (Alpha & Omega Semiconductor Inc.), 3.0SMCJ5.0A-13 (Diodes Incorporated), SMLJ5.0A (Bourns Inc.), and SMLJ5.0A-TP (Micro Commercial Co) provide electrical equivalence to the SMDJ5.0 with identical peak pulse current and power dissipation ratings. All are active products with RoHS3 compliance. SMDJ5.0A and 3.0SMCJ5.0A-13 are manufacturer-recommended direct replacements. SMLJ5.0A and SMLJ5.0A-TP maintain the same electrical performance within the SMLJ series designation.

Reduced-Capacity Substitutes (120A-163A, 1500W): SMCJ5.0A (EVVO Semi), SMCJ5.0A-TP (Micro Commercial Co), SMCJ5.0AE3/TR13 (Microchip Technology), and SMCJ5V0A (Fairchild Semiconductor) are suitable for applications where transient energy levels do not exceed 1500W. These parts maintain the 5V reverse standoff voltage and 9.2V clamping voltage but with reduced peak pulse current capacity. Selection of reduced-capacity parts requires confirmation that application transient events remain within 1500W power dissipation limits.

Temperature Considerations: SMCJ5.0AE3/TR13 (Microchip Technology) and SMLJ5.0A-TP (Micro Commercial Co) support extended upper operating temperature to 175°C, compared to the SMDJ5.0's 150°C maximum. SMCJ5.0AE3/TR13 also matches the SMDJ5.0's lower temperature limit of -65°C.

Packaging and Availability: All substitute parts are housed in DO-214AB (SMC) surface-mount packages with MSL 1 (Unlimited) moisture sensitivity ratings, ensuring PCB assembly compatibility. Tape & Reel (TR) packaging is available for SMCJ5.0A-TP, SMCJ5.0AE3/TR13, SMLJ5.0A, and SMLJ5.0A-TP, supporting automated production environments.

Frequently Asked Questions (FAQ)

Q: Can SMCJ5.0A (163A, 1500W) be used in place of SMDJ5.0 (326.1A, 3000W)?

A: SMCJ5.0A is electrically compatible for voltage parameters (5V standoff, 9.2V clamping) but has reduced peak pulse current and power dissipation capacity. Substitution is valid only if the application's transient overvoltage events do not exceed 1500W peak power. Applications requiring full 3000W dissipation capacity must use full-capacity substitutes such as SMDJ5.0A, 3.0SMCJ5.0A-13, SMLJ5.0A, or SMLJ5.0A-TP.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant, meeting regulatory requirements for hazardous substance restrictions.

Q: What is the difference between SMCJ5.0A and SMLJ5.0A?

A: Both parts share identical electrical specifications (5V standoff, 9.2V clamping, 326A peak pulse, 3000W power). The primary difference is manufacturer designation: SMCJ5.0A is the Alpha & Omega Semiconductor Inc. part number, while SMLJ5.0A is the Bourns Inc. equivalent. Selection between these parts depends on supplier availability and procurement preferences.

Q: Does the SMDJ5.0 operate at -65°C while most substitutes operate at -55°C minimum?

A: The SMDJ5.0 specifies -65°C minimum operating temperature. SMCJ5.0AE3/TR13 (Microchip Technology) matches this lower temperature limit. For applications requiring -65°C operation, SMCJ5.0AE3/TR13 is the appropriate substitute. Other substitutes with -55°C minimum ratings are suitable for applications with higher temperature floors.

Q: Can I use SM5908 (STMicroelectronics) as a substitute?

A: SM5908 maintains the 5V reverse standoff voltage and 9.2V clamping voltage but operates at reduced peak pulse current (120A) and power dissipation (1500W). This part is suitable only for low-energy transient protection applications. High-energy transient environments requiring the SMDJ5.0's 326.1A capacity must use full-capacity substitutes.

Q: Are Tape & Reel packaged parts compatible with my existing PCB assembly process?

A: Yes. Tape & Reel (TR) packaging is standard for automated surface-mount assembly. Parts designated with "-TP" or "/TR13" suffix are supplied in Tape & Reel format and are compatible with standard pick-and-place equipment. Verify your assembly process specifications for reel dimensions and tape specifications if required.

Q: What is the significance of the "-TP" suffix in part numbers like SMCJ5.0A-TP?

A: The "-TP" suffix indicates Tape & Reel packaging, suitable for automated production environments. Parts without this suffix may be supplied in alternative packaging formats (cut tape, bulk). Confirm packaging requirements with your procurement or assembly team.

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