SMLJ28E3/TR13 Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The SMLJ28E3/TR13 is a unidirectional transient voltage suppressor diode manufactured by Microchip Technology, classified as an active product. This surface-mount component in DO-214AB (SMC) package is designed for general-purpose transient voltage suppression in 28V nominal circuits. Alternative models are required when design specifications demand higher peak current handling, increased power dissipation capability, different thermal operating ranges, or alternative supplier sourcing for supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	50	V
Current - Peak Pulse (10/1000µs)	60	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AB (SMC)	-
Type	Zener, Unidirectional	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must equal 28V
Voltage - Breakdown (Min): Must equal 31.1V
Package / Case: Must be DO-214AB (SMC) surface-mount equivalent
Type: Must be Zener, unidirectional configuration
Mounting Type: Must be surface mount
Unidirectional Channels: Must equal 1

Substitute parts are grouped by performance tier based on peak pulse current and power dissipation capacity. Within each tier, parts with identical voltage parameters and package type are functionally interchangeable. Voltage clamping characteristics may vary, affecting circuit response to transient events.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Clamping @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature Range (°C)	Inventory Status
SMLJ28E3/TR13	Microchip Technology	50	60	300	-55 to 150	697 Pcs
3.0SMCJ28A-13	Diodes Incorporated	45.4	66.1	3000	-55 to 175	7042 Pcs
5.0SMDJ28A	Taiwan Semiconductor Corporation	45.4	110	5000	-55 to 175	9400 Pcs
5.0SMDJ28A-T7	Littelfuse Inc.	45.4	110	5000	-65 to 150	1373 Pcs
SMCJ28A-13-F	Diodes Incorporated	45.4	33	1500	-55 to 150	36600 Pcs
SMCJ28A-TR	STMicroelectronics	59	169 (8/20µs)	1500	-55 to 150	2900 Pcs
SMDJ28A	Alpha & Omega Semiconductor Inc.	45.4	66.1	3000	-55 to 150	41900 Pcs
SMLJ28A	Bourns Inc.	45.4	66	3000	-55 to 150	15400 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and are classified as active products, ensuring conformance to environmental regulations and continued supplier support. Parts with identical operating temperature ranges (-55°C to 150°C) provide direct thermal specification compliance with the SMLJ28E3/TR13. The 5.0SMDJ28A and 5.0SMDJ28A-T7 extend the upper temperature limit to 175°C and lower limit to -65°C respectively, suitable for applications requiring enhanced thermal margin.

Selection between substitutes should prioritize parts with established high inventory levels for supply chain stability. The SMCJ28A-13-F, SMDJ28A, and SMLJ28A each exceed 15,400 units in stock. Parts with clamping voltages below 50V (45.4V) provide slightly faster voltage response characteristics than the reference part; those with higher clamping voltage (SMCJ28A-TR at 59V) offer reduced clamping speed but higher peak current rating of 169A.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28A parts substitute for SMLJ28E3/TR13 in circuit applications? A: Yes. All SMCJ28A variants share the required 28V reverse standoff voltage and 31.1V breakdown minimum. Package compatibility (DO-214AB/SMC surface mount) and single unidirectional channel configuration enable direct substitution. Verify clamping voltage tolerance in transient response specifications for your application.

Q: What is the difference between 45.4V and 50V clamping voltage specifications? A: Clamping voltage is the maximum voltage impressed across the diode when peak transient current flows. The SMLJ28E3/TR13 specifies 50V maximum clamp; substitute parts at 45.4V respond faster to transient events with lower voltage overshoot. The SMCJ28A-TR at 59V provides slower response with higher peak current capability (169A). Selection depends on transient waveform characteristics and circuit voltage margin requirements.

Q: Are higher power-rated parts (3000W, 5000W) direct substitutes for the 300W part? A: Yes, within the specified voltage parameters. Higher power ratings indicate greater transient energy absorption capacity and typically result from increased die area or improved thermal design. These parts are electrically compatible and provide increased design margin for transient suppression in high-energy environments. Operating temperature, clamping voltage, and peak current specifications govern functional compatibility.

Q: What packaging differences exist between these TVS diode alternatives? A: All listed parts use surface-mount DO-214AB (SMC) package, enabling footprint compatibility across designs. Tape & Reel (TR) packaging denotes factory standard reeling for automated assembly; unmarked packaging entries indicate standard commercial packaging. No panel-level or package geometry variation exists between these alternatives.

Q: Can parts rated for -65°C minimum temperature substitute for those rated -55°C minimum? A: Yes. The 5.0SMDJ28A-T7 extends the minimum operating temperature to -65°C, providing additional low-temperature margin. This represents a performance enhancement relative to -55°C minimum specifications and introduces no functional incompatibility for applications within the -55°C to 150°C range.

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