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SMLJ48AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMLJ48AE3/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 48V reverse standoff voltage and provides 77.4V clamping at peak pulse current, with a peak pulse power rating of 300W. The part is classified as Active and carries ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1).
Equivalent and substitute parts are identified based on matching electrical characteristics including reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and package compatibility. Alternative sources and higher-power variants are available to support design flexibility and supply chain continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 48 | V |
| Voltage - Breakdown (Min) | 53.3 | V |
| Voltage - Clamping (Max) @ Ipp | 77.4 | V |
| Current - Peak Pulse (10/1000µs) | 38.8 | 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 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the SMLJ48AE3/TR13 are classified into two categories based on electrical and mechanical compatibility:
Direct Substitutes (Equivalent Performance)
Direct substitutes maintain identical electrical specifications: 48V reverse standoff voltage, 53.3V minimum breakdown voltage, 77.4V clamping voltage at peak pulse current, and 38.8A peak pulse current. These parts are sourced from different manufacturers but operate within the same performance envelope. Direct substitutes include SMLJ48A, 3SMC48A TR13 PBFREE, and SMDJ48A. All direct substitutes are packaged in DO-214AB or SMC configurations and support surface-mount assembly.
Similar Substitutes (Enhanced or Reduced Performance)
Similar substitutes share the core voltage specifications (48V reverse standoff, 53.3V breakdown, 77.4V clamping) but differ in peak pulse current handling or power dissipation capability. These parts are suitable when application requirements permit higher power ratings or when lower current ratings are acceptable. Similar substitutes include 5.0SMDJ48A-T7, 5.0SMDJ48A (5000W variants with 64.7A peak pulse current), and SMCJ48A variants (1500W with 19.4A peak pulse current).
Key Parameters Determining Substitution:
- Voltage - Reverse Standoff: 48V (required match)
- Voltage - Breakdown (Min): 53.3V (required match)
- Voltage - Clamping (Max) @ Ipp: 77.4V (required match)
- Unidirectional Channels: 1 (required match)
- Package / Case: DO-214AB or SMC (required match)
- Mounting Type: Surface Mount (required match)
- Type: Zener (required match)
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Operating Temp (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| SMLJ48AE3/TR13 | Microchip Technology | 48 | 53.3 | 77.4 | 38.8 | 300 | -55 to 150 | DO-214AB, SMC | Active |
| 3SMC48A TR13 PBFREE | Central Semiconductor Corp | 48 | 53.3 | 77.4 | 38.8 | 3000 | -65 to 150 | DO-214AB, SMC | Active |
| SMDJ48A | Alpha & Omega Semiconductor Inc. | 48 | 53.3 | 77.4 | 38.8 | 3000 | -55 to 150 | DO-214AB, SMC | Active |
| SMLJ48A-TP | Micro Commercial Co | 48 | 53.3 | 77.4 | 38.8 | 3000 | -55 to 175 | DO-214AB, SMC | Active |
| 5.0SMDJ48A | Taiwan Semiconductor Corporation | 48 | 53.3 | 77.4 | 64.7 | 5000 | -55 to 175 | DO-214AB, SMC | Active |
| 5.0SMDJ48A-T7 | Littelfuse | 48 | 53.3 | 77.4 | 64.7 | 5000 | -65 to 150 | DO-214AB, SMC | Active |
| SMCJ48A | MDD | 48 | 53.3 | 77.4 | 19.4 | 1500 | -50 to 150 | DO-214AB, SMC | Active |
| SMCJ48A-13-F | Diodes Incorporated | 48 | 53.3 | 77.4 | 19.4 | 1500 | -55 to 150 | DO-214AB, SMC | Active |
| SMCJ48A-TP | Micro Commercial Co | 48 | 53.3 | 77.4 | 19.4 | 1500 | -55 to 175 | DO-214AB, SMC | Active |
Engineering Selection Recommendations
All listed substitute parts carry Active product status and ROHS3 compliance, confirming ongoing manufacturer support and environmental regulatory adherence. Selection among equivalent and similar substitutes depends on application-specific power dissipation requirements and thermal operating conditions.
For Direct Substitution (Equivalent Performance):
SMDJ48A (Alpha & Omega Semiconductor Inc.) and SMLJ48A-TP (Micro Commercial Co) provide 3000W peak pulse power with matching 38.8A peak pulse current. Both parts maintain the -55°C to 150°C operating temperature range of the original SMLJ48AE3/TR13. 3SMC48A TR13 PBFREE (Central Semiconductor Corp) extends the lower operating temperature to -65°C while providing 3000W power dissipation.
For Enhanced Power Dissipation:
5.0SMDJ48A (Taiwan Semiconductor Corporation) and 5.0SMDJ48A-T7 (Littelfuse) deliver 5000W peak pulse power with 64.7A peak pulse current, supporting applications requiring higher transient energy absorption. Both parts maintain 48V reverse standoff and 77.4V clamping specifications. The 5.0SMDJ48A-T7 variant extends the lower operating temperature to -65°C.
For Reduced Power Dissipation:
SMCJ48A variants (MDD, Diodes Incorporated, Micro Commercial Co) provide 1500W peak pulse power with 19.4A peak pulse current. These parts are suitable for applications with lower transient energy requirements. SMCJ48A-TP supports the extended upper operating temperature of -55°C to 175°C.
All substitute parts are available in DO-214AB or SMC surface-mount packages compatible with standard PCB assembly processes. Moisture sensitivity level (MSL 1) is maintained across all listed alternatives, indicating unlimited shelf life under standard storage conditions.
Frequently Asked Questions (FAQ)
Q: Can SMDJ48A directly replace SMLJ48AE3/TR13?
A: Yes. SMDJ48A maintains identical voltage specifications (48V reverse standoff, 53.3V breakdown, 77.4V clamping) and peak pulse current (38.8A). The part is packaged in DO-214AB/SMC configuration compatible with SMLJ48AE3/TR13 footprints. SMDJ48A provides 3000W peak pulse power compared to 300W in the original part, offering enhanced thermal margin.
Q: What is the difference between SMLJ48A-TP and SMCJ48A-TP?
A: Both parts are manufactured by Micro Commercial Co in DO-214AB/SMC packages with 48V reverse standoff and 77.4V clamping voltage. SMLJ48A-TP handles 38.8A peak pulse current at 3000W power dissipation. SMCJ48A-TP handles 19.4A peak pulse current at 1500W power dissipation. Selection depends on application transient current magnitude.
Q: Are 5.0SMDJ48A variants suitable for SMLJ48AE3/TR13 replacement?
A: Yes, with application verification. 5.0SMDJ48A and 5.0SMDJ48A-T7 maintain identical voltage specifications and clamping characteristics. Peak pulse current increases to 64.7A with 5000W power dissipation. These parts are suitable when applications require higher transient energy absorption or operate in thermally demanding environments.
Q: What is the significance of the "TR13" designation in SMLJ48AE3/TR13?
A: TR13 indicates Tape & Reel packaging format with 13-inch reel diameter, standard for high-volume surface-mount assembly. Substitute parts with TR designation (3SMC48A TR13 PBFREE, 5.0SMDJ48A-T7) are compatible with automated pick-and-place equipment. Parts with -TP suffix (SMLJ48A-TP, SMCJ48A-TP) also support tape-and-reel packaging.
Q: Can SMCJ48A-13-F replace SMLJ48AE3/TR13 in all applications?
A: SMCJ48A-13-F maintains voltage specifications but operates at 19.4A peak pulse current and 1500W power dissipation, compared to 38.8A and 300W in the original part. This part is suitable only for applications where transient current does not exceed 19.4A. Verify application transient specifications before substitution.
Q: What compliance certifications are maintained across all substitute parts?
A: All listed substitute parts carry ROHS3 compliance and REACH Unaffected status. Moisture sensitivity level (MSL 1) is maintained across all alternatives, confirming unlimited shelf life under standard storage conditions. ECCN classification (EAR99) and HTSUS code (8541.10.0080) remain consistent.
Q: Are there inventory considerations when selecting substitute parts?
A: Inventory levels vary by part number and manufacturer. SMCJ48A (MDD) maintains the highest inventory at 16,125 pieces. SMLJ48A-TP (Micro Commercial Co) provides 3,675 pieces. SMDJ48A (Alpha & Omega Semiconductor Inc.) offers 1,320 pieces. Original SMLJ48AE3/TR13 inventory is 778 pieces. Verify current availability with supplier for production scheduling.
Q: Do all substitute parts support the same operating temperature range?
A: Operating temperature ranges vary. SMLJ48AE3/TR13 operates -55°C to 150°C. SMLJ48A-TP and SMCJ48A-TP extend the upper limit to 175°C. 3SMC48A TR13 PBFREE and 5.0SMDJ48A-T7 extend the lower limit to -65°C. Select parts based on application thermal requirements.
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