SMLJ20E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ20E3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 20V reverse standoff voltage with a 35.8V maximum clamping voltage and 83.8A peak pulse current capability. The device is housed in a DO-214AB (SMC) package and is supplied in tape and reel format.

The SMLJ20E3/TR13 maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical characteristics within the 20V standoff voltage class, compatible package formats, and operational temperature ranges suitable for general-purpose transient suppression applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20	V
Voltage - Breakdown (Min)	22.2	V
Voltage - Clamping (Max) @ Ipp	35.8	V
Current - Peak Pulse (10/1000µs)	83.8	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ20E3/TR13 are selected based on the following critical parameters:

Voltage Class Matching: All substitute parts maintain a 20V reverse standoff voltage with 22.2V minimum breakdown voltage, ensuring compatibility with the same circuit protection requirements.

Package Compatibility: Substitute parts are limited to DO-214AB and SMC package formats, which are mechanically and electrically interchangeable in surface-mount applications.

Clamping Voltage Range: Acceptable substitute parts exhibit clamping voltages between 30V and 35.8V at peak pulse current, maintaining voltage suppression within acceptable circuit operating margins.

Peak Pulse Current: Substitute parts range from 46.3A to 334A peak pulse current, accommodating applications requiring equal or greater transient energy dissipation capability.

Power Dissipation: Substitute parts provide peak pulse power ratings from 1.5kW to 22.5kW, supporting applications with varying transient energy requirements.

Operating Temperature: All substitute parts operate within or exceed the -55°C to 150°C temperature range of the primary part, with some variants extending to 175°C.

Compliance Status: All substitute parts maintain RoHS3 compliance, REACH unaffected status, and EAR99 export classification, matching the regulatory profile of the primary 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)	Package
SMLJ20E3/TR13	Microchip Technology	20	35.8	83.8	300	-55 to 150	DO-214AB, SMC
3.0SMCJ20A-13	Diodes Incorporated	20	32.4	62.6	3000	-55 to 175	DO-214AB, SMC
5.0SMDJ20A	Taiwan Semiconductor Corporation	20	32.4	155	5000	-55 to 175	DO-214AB, SMC
5.0SMDJ20A-T7	Littelfuse Inc.	20	32.4	155	5000	-65 to 150	DO-214AB, SMC
LNBTVS4-222S	STMicroelectronics	20	30	334	22500	-55 to 150	DO-214AB, SMC
SMCJ20A	Fairchild Semiconductor	20	32.4	46.3	1500	-55 to 150	DO-214AB, SMC
SMCJ20A-13-F	Diodes Incorporated	20	32.4	46.3	1500	-55 to 150	DO-214AB, SMC
SMCJ20A-TP	Micro Commercial Co	20	32.4	46.3	1500	-55 to 175	DO-214AB, SMC
SMDJ20A	Alpha & Omega Semiconductor Inc.	20	32.4	92.6	3000	-55 to 150	DO-214AB, SMC

Engineering Selection Recommendations

Direct Substitution (Equivalent Performance): The SMCJ20A series from Fairchild Semiconductor and Diodes Incorporated (SMCJ20A-13-F) provide equivalent electrical characteristics with 32.4V clamping voltage and 46.3A peak pulse current. These parts maintain identical operating temperature ranges and package specifications, suitable for applications where the primary part's 83.8A capability exceeds circuit requirements.

Enhanced Capability Substitution: The SMDJ20A from Alpha & Omega Semiconductor Inc. and the 5.0SMDJ20A series from Taiwan Semiconductor Corporation and Littelfuse Inc. provide increased peak pulse current (92.6A to 155A) and power dissipation (3kW to 5kW). These parts accommodate higher transient energy requirements while maintaining the 20V voltage class and DO-214AB package format. The 5.0SMDJ20A-T7 variant extends the lower operating temperature limit to -65°C.

High-Energy Substitution: The LNBTVS4-222S from STMicroelectronics (TRANSIL™ series) delivers 334A peak pulse current and 22.5kW power dissipation, suitable for applications requiring maximum transient suppression capability within the 20V voltage class. This part maintains the same operating temperature range as the primary component.

Compliance Verification: All substitute parts maintain RoHS3 compliance, REACH unaffected status, and EAR99 export classification. Moisture sensitivity level remains at MSL 1 (unlimited) across all variants, ensuring compatibility with standard surface-mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMCJ20A parts directly replace SMLJ20E3/TR13 in existing designs?

A: Yes. SMCJ20A variants maintain identical 20V reverse standoff voltage, 22.2V minimum breakdown voltage, and DO-214AB package format. The 32.4V clamping voltage is lower than the primary part's 35.8V specification, providing more aggressive voltage suppression. Peak pulse current of 46.3A is lower than the primary part's 83.8A, suitable for applications with reduced transient energy requirements.

Q: What is the difference between 1.5kW and 3kW power-rated parts?

A: Power rating indicates the maximum transient energy the device can dissipate during a 10/1000µs pulse. The 3kW-rated SMDJ20A and 3.0SMCJ20A-13 accommodate twice the transient energy of 1.5kW-rated SMCJ20A parts. Selection depends on the actual transient pulse energy in the application circuit.

Q: Are tape and reel (TR) and bulk packaging interchangeable?

A: Tape and reel packaging is standard for automated surface-mount assembly. Bulk packaging is used for manual assembly or reel consolidation. The electrical and mechanical specifications remain identical; packaging format selection depends on assembly process requirements.

Q: Can I use a part with higher peak pulse current than required?

A: Yes. A device rated for higher peak pulse current provides equivalent or superior protection at lower stress levels. The LNBTVS4-222S with 334A capability can replace the primary part's 83.8A specification without circuit modification, though cost and board space considerations may apply.

Q: What is the significance of clamping voltage variation between 30V and 35.8V?

A: Clamping voltage determines the maximum voltage the protected circuit experiences during transient suppression. Lower clamping voltage (30V) provides more aggressive protection but may increase device stress. Higher clamping voltage (35.8V) reduces device stress but allows higher transient voltages. Selection depends on circuit tolerance specifications.

Q: Do operating temperature range differences affect substitution suitability?

A: Operating temperature range affects device reliability in extreme environments. The primary part operates -55°C to 150°C. Substitutes extending to 175°C or -65°C provide enhanced capability for wider temperature applications. Substitutes with identical or narrower ranges remain suitable for the primary part's specified environment.

Q: Is the LNBTVS4-222S with 8/20µs pulse specification compatible with 10/1000µs rated parts?

A: The LNBTVS4-222S peak pulse current is specified at 8/20µs waveform, while other parts use 10/1000µs specification. These represent different transient pulse shapes. The LNBTVS4-222S provides higher peak current capability under its specified waveform and remains suitable for general-purpose transient suppression applications.

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