Request Quote
(Ships tomorrow)
SMLJ18E3/TR13 Equivalent & Substitute Parts
Part Overview
The SMLJ18E3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This surface-mount component operates with an 18V reverse standoff voltage and provides 32.2V maximum clamping voltage at peak pulse current. The part is currently in active production status with 651 pieces available in original inventory.
Equivalent and substitute parts are identified based on matching electrical characteristics within the 18V voltage class, compatible DO-214AB/SMC package specifications, and surface-mount mounting requirements. Substitute parts maintain functional equivalence for transient voltage suppression while accommodating variations in peak pulse power ratings and manufacturer specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | SMLJ18E3/TR13 | — |
| Manufacturer | Microchip Technology | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Voltage - Reverse Standoff (Typ) | 18 | V |
| Voltage - Breakdown (Min) | 20 | V |
| Voltage - Clamping (Max) @ Ipp | 32.2 | V |
| Current - Peak Pulse (10/1000µs) | 93.2 | A |
| Power - Peak Pulse | 300 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-214AB, SMC | — |
| RoHS Status | ROHS3 Compliant | — |
| Product Status | Active | — |
Substitute Part Grouping Explanation
Substitute parts for the SMLJ18E3/TR13 are qualified based on the following electrical and mechanical criteria:
Voltage Class Matching: All substitute parts maintain the same 18V reverse standoff voltage and 20V minimum breakdown voltage, ensuring compatibility with the protected circuit voltage levels.
Package Compatibility: All substitute parts use the DO-214AB or SMC surface-mount package, maintaining identical PCB footprint and assembly process compatibility.
Unidirectional Configuration: All substitute parts feature single-channel unidirectional topology, matching the original part's transient suppression architecture.
Clamping Voltage Range: Substitute parts operate within the 29.2V to 32.2V clamping voltage range at peak pulse current, maintaining effective overvoltage suppression characteristics.
Peak Pulse Current Capability: Substitute parts range from 51.4A to 172A peak pulse current, accommodating different transient energy levels while maintaining the 18V voltage class specification.
Power Dissipation Ratings: Substitute parts span 1500W to 5000W peak pulse power ratings, providing options for applications with varying transient energy requirements.
Compliance Standards: All substitute parts maintain ROHS3 compliance and EAR99 export classification, matching the regulatory status of the original part.
Parameter Comparison
| Parameter | SMLJ18E3/TR13 (Main) | 5.0SMDJ18A | SMCJ18A | SMCJ18A-13-F | SMDJ18A | SMLJ18A |
|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Taiwan Semiconductor Corporation | MDD | Diodes Incorporated | Alpha & Omega Semiconductor Inc. | Bourns Inc. |
| Voltage - Reverse Standoff (Typ) | 18V | 18V | 18V | 18V | 18V | 18V |
| Voltage - Breakdown (Min) | 20V | 20V | 20V | 20V | 20V | 20V |
| Voltage - Clamping (Max) @ Ipp | 32.2V | 29.2V | 29.2V | 29.2V | 29.2V | 29.2V |
| Current - Peak Pulse (10/1000µs) | 93.2A | 172A | 51.4A | 51.4A | 102.8A | 102.8A |
| Power - Peak Pulse | 300W | 5000W | 1500W | 1500W | 3000W | 3000W |
| Operating Temperature Range | -55 to 150°C | -55 to 175°C | -50 to 150°C | -55 to 150°C | -55 to 150°C | -55 to 150°C |
| Package / Case | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Selection Criteria:
All substitute parts listed maintain active production status and ROHS3 compliance, ensuring long-term availability and regulatory conformance equivalent to the SMLJ18E3/TR13.
Power Rating Considerations:
The SMLJ18E3/TR13 operates at 300W peak pulse power. Substitute parts with equal or higher power ratings (SMDJ18A at 3000W, SMLJ18A at 3000W, and 5.0SMDJ18A at 5000W) provide direct functional substitution with enhanced transient energy handling capability. The SMCJ18A and SMCJ18A-13-F at 1500W power rating accommodate applications with lower transient energy requirements.
Temperature Range Compatibility:
The SMLJ18E3/TR13 operates across -55°C to 150°C. The 5.0SMDJ18A extends the upper operating temperature to 175°C, providing enhanced thermal margin. The SMCJ18A operates to 150°C with a reduced lower temperature limit of -50°C. All other substitute parts match the full -55°C to 150°C range.
Clamping Voltage Performance:
The SMLJ18E3/TR13 exhibits 32.2V maximum clamping voltage. All substitute parts clamp at 29.2V, representing a 2.8V reduction in clamping voltage. This lower clamping voltage provides improved transient suppression performance in applications where lower peak voltage is beneficial.
Peak Pulse Current Capability:
Substitute parts range from 51.4A (SMCJ18A variants) to 172A (5.0SMDJ18A). Selection depends on transient current magnitude in the protected circuit. The SMDJ18A and SMLJ18A at 102.8A provide intermediate current handling between the original 93.2A specification and higher-capacity alternatives.
Manufacturer Availability:
Multiple manufacturers provide equivalent parts, supporting supply chain flexibility. Microchip Technology (original), Taiwan Semiconductor Corporation, MDD, Diodes Incorporated, Alpha & Omega Semiconductor Inc., and Bourns Inc. all maintain active production of compatible 18V TVS diodes in DO-214AB/SMC packages.
Frequently Asked Questions (FAQ)
Q: Can SMCJ18A substitute for SMLJ18E3/TR13 in all applications?
A: SMCJ18A maintains identical voltage class (18V standoff), package (DO-214AB/SMC), and mounting type specifications. The 1500W power rating accommodates applications with transient energy up to 1500W. Applications requiring the original 300W specification or higher transient energy levels should select SMDJ18A (3000W) or SMLJ18A (3000W) for equivalent or enhanced performance.
Q: What is the significance of the clamping voltage difference between SMLJ18E3/TR13 (32.2V) and substitute parts (29.2V)?
A: The lower clamping voltage of substitute parts (29.2V versus 32.2V) represents improved transient suppression performance. Lower clamping voltage reduces peak voltage stress on protected components during transient events. This characteristic makes substitute parts suitable for applications where lower peak voltage is required or beneficial.
Q: Are all substitute parts available in tape and reel packaging?
A: SMCJ18A-13-F, SMDJ18A, and SMLJ18A are specified with tape and reel (TR) packaging. The 5.0SMDJ18A and MDD SMCJ18A variants do not specify packaging format in the provided data. Packaging format should be confirmed with the supplier for specific procurement requirements.
Q: Does the 5.0SMDJ18A extended temperature range (-55°C to 175°C) provide advantages over the standard -55°C to 150°C range?
A: The 5.0SMDJ18A extends the maximum operating temperature to 175°C, providing 25°C additional thermal margin. This extended range is beneficial for applications operating in high-temperature environments or with limited thermal management. Standard-range parts (-55°C to 150°C) are suitable for typical industrial and commercial applications.
Q: How do peak pulse current ratings affect substitution decisions?
A: Peak pulse current ratings (51.4A to 172A) determine the maximum transient current the TVS diode can suppress. Selection should match or exceed the anticipated transient current in the protected circuit. The SMLJ18E3/TR13 at 93.2A is suitable for transients up to 93.2A. Higher-rated parts (SMDJ18A at 102.8A, 5.0SMDJ18A at 172A) accommodate larger transient currents. Lower-rated parts (SMCJ18A at 51.4A) are suitable for applications with transient currents below 51.4A.
Q: Are all substitute parts ROHS3 compliant?
A: All listed substitute parts maintain ROHS3 compliance, matching the regulatory status of the SMLJ18E3/TR13. This ensures compatibility with procurement requirements and environmental regulations across all substitute options.
Q: What is the impact of selecting SMLJ18A or SMDJ18A with 3000W power rating versus the original 300W specification?
A: The 3000W power rating provides 10-fold increased transient energy handling capability. This higher rating accommodates applications with larger transient pulses or multiple successive transient events. The 300W specification of the original part is suitable for applications with lower transient energy. Selection should match the actual transient energy profile of the protected circuit.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts