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SMLJ85AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMLJ85AE3/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 85V reverse standoff voltage and provides 137V maximum clamping voltage at peak pulse current. The part is active in production status and fully compliant with RoHS3 and REACH regulations.
Equivalent and substitute parts are identified based on matching electrical characteristics including reverse standoff voltage, clamping voltage, peak pulse current capability, and power dissipation ratings. Substitute parts may vary in peak pulse current capacity and power handling, which affects their suitability for specific circuit protection requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 85 | V |
| Voltage - Breakdown (Min) | 94.4 | V |
| Voltage - Clamping (Max) @ Ipp | 137 | V |
| Current - Peak Pulse (10/1000µs) | 20.8 | 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 | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMLJ85AE3/TR13 are classified based on electrical parameter compatibility. All identified substitutes maintain the core voltage specifications: 85V reverse standoff voltage, 94.4V minimum breakdown voltage, and 137V maximum clamping voltage. These voltage parameters are critical for proper circuit protection function and determine primary substitutability.
Substitutes are differentiated by peak pulse current (Ipp) and power dissipation capacity. The main part specifies 20.8A peak pulse current with 300W power handling. Substitute parts range from 10.4A to 36.5A peak pulse current and 1500W to 5000W power dissipation. Selection of a substitute with higher current and power ratings provides enhanced protection margin; selection of a substitute with lower ratings requires circuit analysis to confirm adequacy.
All substitute parts share the following characteristics:
- Voltage - Reverse Standoff: 85V
- Voltage - Breakdown (Min): 94.4V
- Voltage - Clamping (Max) @ Ipp: 137V
- Mounting Type: Surface Mount
- Package / Case: DO-214AB or SMC equivalent
- Type: Zener, Unidirectional
- RoHS3 Compliance: Yes
- Moisture Sensitivity Level: 1 (Unlimited)
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | Package |
|---|---|---|---|---|---|---|---|---|
| SMLJ85AE3/TR13 | Microchip Technology | 85 | 94.4 | 137 | 20.8 | 300 | -55 to 150 | DO-214AB, SMC |
| 3SMC85A TR13 PBFREE | Central Semiconductor Corp | 85 | 94.4 | 137 | 20.8 | 3000 | -65 to 150 | DO-214AB, SMC |
| 5.0SMDJ85A | Taiwan Semiconductor Corporation | 85 | 94.4 | 137 | 36.5 | 5000 | -55 to 175 | DO-214AB, SMC |
| 5.0SMDJ85A-T7 | Littelfuse | 85 | 94.4 | 137 | 36.5 | 5000 | -65 to 150 | DO-214AB, SMC |
| SMCJ85A | MDD | 85 | 94.4 | 137 | 11 | 1500 | -50 to 150 | DO-214AB, SMC |
| SMCJ85A-13-F | Diodes Incorporated | 85 | 94.4 | 137 | 10.4 | 1500 | -55 to 150 | DO-214AB, SMC |
| SMCJ85A-TP | Micro Commercial Co | 85 | 94.4 | 137 | 11 | 1500 | -55 to 175 | DO-214AB, SMC |
| SMDJ85A | Alpha & Omega Semiconductor Inc. | 85 | 94.4 | 137 | 21.9 | 3000 | -55 to 150 | DO-214AB, SMC |
| SMLJ85A | Bourns Inc. | 85 | 94.4 | 137 | 20.8 | 3000 | -55 to 150 | DO-214AB, SMC |
Engineering Selection Recommendations
Direct Electrical Equivalents
SMLJ85A (Bourns Inc.) and SMDJ85A (Alpha & Omega Semiconductor Inc.) provide the closest electrical match to the SMLJ85AE3/TR13. Both maintain identical voltage specifications and peak pulse current (20.8A and 21.9A respectively), with equivalent 3000W power dissipation. Both parts are RoHS3 compliant with MSL 1 rating and operate across the -55°C to 150°C temperature range. These parts are suitable for direct substitution in applications where the original part is unavailable.
Enhanced Protection Capability
3SMC85A TR13 PBFREE (Central Semiconductor Corp), 5.0SMDJ85A (Taiwan Semiconductor Corporation), and 5.0SMDJ85A-T7 (Littelfuse) offer increased power dissipation (3000W to 5000W) and higher peak pulse current (20.8A to 36.5A) compared to the main part. These parts maintain identical voltage protection characteristics while providing greater transient energy absorption capacity. All three are RoHS3 compliant. The 5.0SMDJ series parts extend the upper operating temperature to 175°C. These substitutes are applicable when circuit protection requirements demand higher energy handling or extended thermal performance.
Reduced Protection Capability
SMCJ85A (MDD), SMCJ85A-13-F (Diodes Incorporated), and SMCJ85A-TP (Micro Commercial Co) provide lower peak pulse current (10.4A to 11A) and reduced power dissipation (1500W) relative to the main part. These parts maintain identical voltage specifications and are RoHS3 compliant with MSL 1 rating. SMCJ85A-TP extends the upper operating temperature to 175°C. These substitutes are applicable only when circuit analysis confirms that reduced transient current handling is adequate for the protection application.
Compliance and Production Status
All identified substitute parts are active in production status and fully compliant with RoHS3 regulations. All parts carry REACH Unaffected or REACH Affected status as specified. Moisture sensitivity level is uniformly MSL 1 (Unlimited) across all parts, indicating no special moisture control requirements during storage or handling.
Frequently Asked Questions (FAQ)
Q: Can SMCJ85A-TP be used as a direct replacement for SMLJ85AE3/TR13?
A: SMCJ85A-TP is electrically compatible for voltage protection function, maintaining identical 85V standoff, 94.4V breakdown, and 137V clamping voltages. However, it provides 11A peak pulse current versus the original 20.8A. Substitution is valid only when circuit transient current levels do not exceed 11A. The part offers extended temperature operation to 175°C and is RoHS3 compliant.
Q: What is the difference between the 5.0SMDJ85A and SMLJ85AE3/TR13?
A: Both parts maintain identical voltage specifications (85V standoff, 137V clamping). The 5.0SMDJ85A provides significantly higher peak pulse current (36.5A versus 20.8A) and power dissipation (5000W versus 300W). The 5.0SMDJ85A also extends the upper operating temperature to 175°C. This part is suitable for applications requiring enhanced transient protection margin or higher thermal performance.
Q: Are all substitute parts available in the same package as the original?
A: All identified substitute parts use DO-214AB or SMC package designations, which are mechanically and electrically compatible. Surface-mount footprints are identical across all parts, allowing direct PCB placement without layout modification.
Q: Which substitute part provides the closest performance match?
A: SMLJ85A (Bourns Inc.) provides the closest performance match, with identical 20.8A peak pulse current, 3000W power dissipation, and -55°C to 150°C operating temperature range. Voltage specifications are identical to the original part. This part is recommended when direct functional equivalence is required.
Q: Do all substitute parts meet RoHS3 compliance?
A: All identified substitute parts are RoHS3 compliant. SMLJ85A (Bourns Inc.) carries REACH Affected status; all other substitutes carry REACH Unaffected status. Moisture sensitivity level is MSL 1 (Unlimited) for all parts except SMDJ85A, which does not specify MSL rating.
Q: Can a higher-rated part like 5.0SMDJ85A-T7 be used in place of the original?
A: Yes. The 5.0SMDJ85A-T7 maintains identical voltage protection specifications while providing enhanced current and power handling (36.5A, 5000W). This substitution provides additional protection margin and is applicable in all applications where the original part functions. The part is RoHS3 compliant and operates across -65°C to 150°C.
Q: What is the inventory status of substitute parts?
A: Inventory availability varies by part number. SMCJ85A (MDD) has the highest inventory at 17,917 pieces. 5.0SMDJ85A (Taiwan Semiconductor Corporation) has 18,460 pieces available. SMLJ85A (Bourns Inc.) has 9,300 pieces. Other substitutes range from 1,811 to 4,552 pieces in stock. Availability should be confirmed with the component supplier for production requirements.
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