SMLJ5.0E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ5.0E3/TR13 is a 5V transient voltage suppressor (TVS) diode manufactured by Microchip Technology, housed in a DO-214AB surface mount package. This unidirectional Zener-type device provides clamping protection at 9.6V with a peak pulse current capacity of 312.5A and 300W peak pulse power handling. As an active product with full ROHS3 compliance and unlimited moisture sensitivity rating, it is widely used in general-purpose transient protection applications requiring surface mount assembly. Equivalent substitute parts are identified to provide procurement flexibility and alternative sourcing when the primary part number becomes unavailable or when alternative electrical characteristics within defined parameter ranges are acceptable.

Key Parameters

Parameter	SMLJ5.0E3/TR13	Unit
Voltage – Reverse Standoff (Typ)	5	V
Voltage – Breakdown (Min)	6.4	V
Voltage – Clamping (Max) @ Ipp	9.6	V
Current – Peak Pulse (10/1000µs)	312.5	A
Power – Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ5.0E3/TR13 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage – Reverse Standoff: 5V (must be identical)
Voltage – Breakdown (Min): 6.4V (must be identical)
Unidirectional Channels: 1 (must be identical)
Mounting Type: Surface Mount (must be compatible)
Package / Case: DO-214AB or SMC equivalent (must be mechanically compatible)
Product Status: Active (current availability requirement)
RoHS Compliance: ROHS3 Compliant (regulatory requirement)

Variable Parameters (within acceptable ranges):

Voltage – Clamping (Max) @ Ipp: 9.2V to 13.4V (acceptable clamping voltage window)
Current – Peak Pulse: 163A to 746A (acceptable current handling range)
Power – Peak Pulse: 1500W to 3000W (acceptable power dissipation range)
Operating Temperature: -55°C to 175°C maximum junction temperature
Capacitance @ Frequency: When specified, values between 8000pF @ 1MHz acceptable

Substitutes that maintain identical standoff and breakdown voltages with compatible clamping, current, and power characteristics are classified as direct equivalents. Parts meeting these criteria can be selected based on availability, inventory levels, packaging format (Tape & Reel vs. Cut Tape), and supply chain considerations.

Parameter Comparison

Part Number	Manufacturer	Standoff V	Breakdown V	Clamp V	Peak Pulse A	Peak Power W	Temp Range °C	Package	RoHS
SMLJ5.0E3/TR13	Microchip Technology	5	6.4	9.6	312.5	300	-55 to 150	DO-214AB	ROHS3
3.0SMCJ5.0A-13	Diodes Incorporated	5	6.4	9.2	326.1	3000	-55 to 150	SMC	ROHS3
SMCJ5.0A	EVVO Semi	5	6.4	9.2	163	1500	-55 to 150	SMC	ROHS3
SMCJ5.0A-13-F	Diodes Incorporated	5	6.4	9.2	163	1500	-55 to 150	SMC	ROHS3
SMCJ5.0A-TP	Micro Commercial Co	5	6.4	9.2	163	1500	-55 to 175	SMC (DO-214AB)	ROHS3
SMCJ5.0A-TR	STMicroelectronics	5	6.4	13.4	746	1500	-55 to 150	SMC	ROHS3
SMCJ5V0A	Fairchild Semiconductor	5	6.4	9.2	163	1500	Not specified	SMC (DO-214AB)	—
SMDJ5.0A	Alpha & Omega Semiconductor Inc.	5	6.4	9.2	326.1	3000	-55 to 150	DO-214AB	ROHS3
SMDJ5.0A-T7	Littelfuse Inc.	5	6.4	9.2	326.1	3000	-65 to 150	DO-214AB	ROHS3

Engineering Selection Recommendations

Preferred Substitutes (Maximum Parameter Compatibility):

Parts maintaining identical standoff voltage (5V), breakdown voltage (6.4V), and closest clamping voltage specifications are SMCJ5.0A-TP (Micro Commercial Co) and SMCJ5.0A-13-F (Diodes Incorporated). Both provide 9.2V clamping with active product status and full ROHS3 compliance. SMCJ5.0A-TP offers extended temperature range to 175°C, making it suitable for higher thermal environments.

Higher Power Capability Substitutes:

3.0SMCJ5.0A-13 (Diodes Incorporated), SMDJ5.0A (Alpha & Omega Semiconductor Inc.), and SMDJ5.0A-T7 (Littelfuse Inc.) provide 3000W peak pulse power compared to the original 300W, offering enhanced margin for transient energy absorption. SMDJ5.0A-T7 extends the lower operating temperature limit to -65°C. All three maintain identical voltage specifications and ROHS3 compliance.

Higher Peak Pulse Current Alternative:

SMCJ5.0A-TR (STMicroelectronics, TRANSIL™ series) provides 746A peak pulse current at 13.4V clamping voltage, delivering significantly higher transient current handling capacity while maintaining identical standoff and breakdown voltages. This part is suitable for applications requiring elevated surge current capability.

Secondary Substitutes with Operational Compatibility:

SMCJ5V0A (Fairchild Semiconductor) and SMCJ5.0A (EVVO Semi) provide functional compatibility with 9.2V clamping and 163A peak pulse current. Temperature range and compliance certifications should be verified against specific application requirements before selection.

Selection Basis:

All recommended substitutes maintain identical voltage standoff and breakdown specifications, ensuring core protection function equivalence. Selection among qualified alternatives is based on available inventory, specific thermal requirements, peak power or current requirements of the application, packaging format preferences (Tape & Reel vs. Cut Tape), and supply chain lead times. All substitutes carry active product status and ROHS3 compliance except SMCJ5V0A, where compliance documentation should be verified.

Frequently Asked Questions (FAQ)

Q1: What makes a part a valid substitute for the SMLJ5.0E3/TR13?

A valid substitute must maintain 5V reverse standoff voltage and 6.4V minimum breakdown voltage—these are non-negotiable parameters that define the protection threshold. The substitute must also be unidirectional, surface mount in DO-214AB or equivalent SMC package, and carry active product status with ROHS3 compliance. Clamping voltage, peak pulse current, and power specifications may vary within the acceptable ranges identified above.

Q2: Can I use a substitute with a different clamping voltage?

Clamping voltage variations between 9.2V and 13.4V are acceptable for applications using the SMLJ5.0E3/TR13, as they represent the voltage level at which the TVS diode clamps transients. Higher clamping voltages (such as the 13.4V specification of SMCJ5.0A-TR) provide more margin but may allow slightly higher transient voltages to appear at the protected node. Lower clamping voltages provide tighter protection. Selection depends on the specific clamping voltage tolerance of the protected circuit.

Q3: What is the difference between DO-214AB and SMC package designations?

DO-214AB and SMC are equivalent mechanical package designations for the same surface mount form factor. Both describe the same physical dimensions and lead configuration. Parts specified as either DO-214AB or SMC are mechanically and electrically interchangeable for PCB assembly purposes.

Q4: Are all substitute parts immediately available?

Inventory levels vary by part number and supplier. The provided inventory counts indicate current stock availability: SMCJ5.0A (EVVO Semi) carries the highest inventory at 47,140 pcs, while others range from 1,408 to 9,400 pcs. Availability should be confirmed with your component supplier for production requirements.

Q5: Do I need to re-qualify the circuit design when using a substitute part?

Design re-qualification depends on the specific substitute selected. Substitutes maintaining identical standoff and breakdown voltages with clamping voltages within the 9.2V–13.4V range require circuit validation to confirm that the new clamping voltage does not cause circuit malfunction. Substitutes with significantly different peak pulse current or power ratings should be evaluated to confirm adequate transient energy absorption for the application. Consult the original circuit design documentation and application schematic for voltage and current margin requirements.

Q6: Why do some parts specify capacitance @ frequency while others do not?

Capacitance specifications are provided when the manufacturer characterizes parasitic capacitance across the TVS diode junction. This parameter becomes relevant for high-frequency signal applications where capacitive coupling or frequency response effects must be minimized. General-purpose transient protection applications typically do not require specific capacitance values. When 8000pF @ 1MHz is specified (3.0SMCJ5.0A-13), this indicates junction capacitance at 1MHz operating frequency.

Q7: What is the significance of the temperature range difference in SMCJ5.0A-TP (-55°C to 175°C) compared to the original part (-55°C to 150°C)?

The extended upper temperature limit of 175°C in SMCJ5.0A-TP indicates the maximum junction temperature the device can sustain without performance degradation. This provides 25°C additional thermal margin, making it suitable for high-ambient-temperature applications or designs with limited thermal management. The original part is rated to 150°C, which remains adequate for most general-purpose applications.

Q8: Can I mix different substitute parts on the same PCB assembly?

Mixed usage of different part numbers on a single PCB is acceptable from an electrical standpoint, as all substitutes maintain identical voltage specifications. However, procurement and inventory management typically favor single-part-number assignments per PCB design to simplify supply chain logistics, reduce SKU complexity, and minimize assembly process variations.

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