SMLJ22AE3/TR13 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMLJ22AE3/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 operates with a 22V reverse standoff voltage and provides 35.5V maximum clamping voltage at peak pulse current of 84.4A. The part is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching electrical performance characteristics within the 22V TVS diode category. Substitutes maintain identical or superior ratings across voltage parameters, clamping specifications, and thermal operating ranges while accommodating variations in peak pulse current handling and power dissipation capabilities.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	24.4	V
Voltage - Clamping (Max) @ Ipp	35.5	V
Current - Peak Pulse (10/1000µs)	84.4	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

Substitution eligibility for the SMLJ22AE3/TR13 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Voltage - Clamping (Max) @ Ipp: 35.5V
Unidirectional Channels: 1
Type: Zener
Mounting Type: Surface Mount
Package / Case: DO-214AB or SMC variant

Allowable Variation Parameters:

Current - Peak Pulse (10/1000µs): Equal to or greater than 84.4A
Power - Peak Pulse: Equal to or greater than 300W
Operating Temperature Range: Equal to or exceeding -55°C to 150°C
Packaging format: Tape & Reel (TR) or Bulk acceptable

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical specifications) and Enhanced Substitutes (superior current handling or power dissipation with identical voltage characteristics).

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) V	Vbr (Min) V	Vc (Max) @ Ipp V	Ipp (10/1000µs) A	Power W	Temp Range °C	Package	RoHS3
SMLJ22AE3/TR13	Microchip Technology	22	24.4	35.5	84.4	300	-55 to 150	DO-214AB	Yes
3SMC22A TR13 PBFREE	Central Semiconductor Corp	22	24.4	35.5	84.4	3000	-65 to 150	SMC	Yes
5.0SMDJ22A	Taiwan Semiconductor Corporation	22	24.4	35.5	141	5000	-55 to 175	DO-214AB (SMC)	Yes
5.0SMDJ22A-T7	Littelfuse Inc.	22	24.4	35.5	141	5000	-65 to 150	DO-214AB (SMCJ)	Yes
SMCJ22A	Fairchild Semiconductor	22	24.4	35.5	42.3	1500	-55 to 150	SMC (DO-214AB)	No
SMCJ22A-13-F	Diodes Incorporated	22	24.4	35.5	42.2	1500	-55 to 150	SMC	Yes
SMCJ22A-TR	STMicroelectronics	22	24.4	48.3	207	1500	-55 to 150	SMC	Yes
SMDJ22A	Alpha & Omega Semiconductor Inc.	22	24.4	35.5	84.6	3000	-55 to 150	DO-214AB	Yes
SMLJ22A	Bourns Inc.	22	24.4	35.5	84.4	3000	-55 to 150	SMC (DO-214AB)	Yes

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Performance):

The SMLJ22A from Bourns Inc. provides exact electrical equivalence to the SMLJ22AE3/TR13, with matching voltage ratings, peak pulse current of 84.4A, and identical operating temperature range. Both components carry RoHS3 compliance and MSL 1 rating. This part is suitable for direct substitution in existing designs without circuit modification.

Enhanced Substitutes (Superior Current/Power Handling):

The 3SMC22A TR13 PBFREE from Central Semiconductor Corp and SMDJ22A from Alpha & Omega Semiconductor Inc. maintain identical voltage specifications while providing 10× power dissipation capability (3000W versus 300W). These parts accommodate higher transient energy absorption and are suitable for applications requiring increased surge protection margin. Both are RoHS3 compliant with MSL 1 rating.

The 5.0SMDJ22A series (Taiwan Semiconductor Corporation and Littelfuse 5.0SMDJ22A-T7) offers the highest performance envelope with 141A peak pulse current and 5000W power rating, extending the upper temperature operating limit to 175°C (Taiwan variant). These components are appropriate for demanding industrial and telecom applications.

Limited Substitutes (Reduced Current Handling):

The SMCJ22A variants from Fairchild Semiconductor and Diodes Incorporated (SMCJ22A-13-F) provide reduced peak pulse current of 42.2–42.3A and 1500W power dissipation. These parts are suitable only for applications with lower transient energy requirements. The Fairchild variant lacks RoHS3 certification and should be avoided in regulated environments.

Non-Equivalent Substitute (Voltage Deviation):

The SMCJ22A-TR from STMicroelectronics exhibits a maximum clamping voltage of 48.3V, exceeding the 35.5V specification of the primary part. This deviation disqualifies it from direct substitution in voltage-sensitive circuits, despite matching standoff and breakdown voltages.

Frequently Asked Questions (FAQ)

Q: Can SMCJ22A replace SMLJ22AE3/TR13 in all applications?

A: No. The SMCJ22A variants provide only 42.2–42.3A peak pulse current compared to the 84.4A specification of SMLJ22AE3/TR13. Substitution is limited to applications with lower transient energy requirements. Additionally, the Fairchild SMCJ22A lacks RoHS3 compliance.

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

A: DO-214AB and SMC refer to the same physical package format used for surface-mount diodes. Both designations are interchangeable in PCB footprint and mounting requirements. Supplier device package notation may vary by manufacturer.

Q: Are the 5.0SMDJ22A series parts backward compatible with SMLJ22AE3/TR13?

A: Yes, the 5.0SMDJ22A and 5.0SMDJ22A-T7 are electrically backward compatible. They maintain identical voltage ratings (22V standoff, 24.4V breakdown, 35.5V clamping) while providing superior current handling (141A versus 84.4A) and power dissipation (5000W versus 300W). Extended temperature range to 175°C in the Taiwan variant provides additional margin for high-temperature environments.

Q: Which substitute offers the best cost-to-performance ratio for general-purpose applications?

A: The SMDJ22A from Alpha & Omega Semiconductor Inc. provides 10× power improvement (3000W) over the original part while maintaining identical voltage and current specifications, with full RoHS3 and MSL 1 compliance. This represents optimal performance enhancement for general-purpose protection circuits.

Q: Can SMCJ22A-TR from STMicroelectronics be used as a substitute?

A: No. The SMCJ22A-TR exhibits a maximum clamping voltage of 48.3V, which exceeds the 35.5V maximum of SMLJ22AE3/TR13. This voltage deviation creates incompatibility in circuits designed for the lower clamping specification and disqualifies it from direct substitution.

Q: What is the significance of the TR13 packaging designation in SMLJ22AE3/TR13?

A: TR13 indicates Tape & Reel packaging format with 13-inch reel diameter, suitable for automated assembly processes. Substitute parts with TR designation are directly compatible for high-volume manufacturing. Bulk-packaged alternatives require manual handling and may not be suitable for automated pick-and-place operations.

Q: Are all listed substitutes RoHS3 compliant?

A: No. The Fairchild Semiconductor SMCJ22A (Bulk packaging variant) does not carry RoHS3 certification. All other substitutes listed are RoHS3 compliant. For regulated applications requiring RoHS3 compliance, select from: 3SMC22A TR13 PBFREE, 5.0SMDJ22A, 5.0SMDJ22A-T7, SMCJ22A-13-F, SMCJ22A-TR, SMDJ22A, or SMLJ22A.

Q: What is the moisture sensitivity level (MSL) requirement for SMLJ22AE3/TR13?

A: The part carries MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints. All substitute parts with specified MSL ratings also carry MSL 1 designation, ensuring compatibility with standard storage and handling procedures without desiccant requirements.

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