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SMAJ85AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMAJ85AE3/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 an 85V reverse standoff voltage and provides clamping at 137V maximum, with a peak pulse current rating of 3.6A (10/1000µs). The part is active in production status and complies with RoHS3 and REACH requirements.
Equivalent and substitute parts are identified based on matching electrical characteristics within the 85V voltage class, identical packaging (DO-214AC/SMA), and compatible operating temperature ranges. Substitutes maintain the same unidirectional channel configuration and general-purpose application profile.
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) | 3.6 | A |
| Power - Peak Pulse | 500 | W |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature | -65 to 150 | °C (TJ) |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility for the SMAJ85AE3/TR13 is determined by the following critical parameters:
Primary Matching Criteria:
- Voltage - Reverse Standoff (Typ): 85V
- Voltage - Breakdown (Min): 94V or higher
- Voltage - Clamping (Max) @ Ipp: 137V to 146V range
- Package / Case: DO-214AC or SMA (equivalent)
- Mounting Type: Surface Mount
- Type: Zener, Unidirectional (1 channel)
- RoHS3 Compliance: Required
Secondary Compatibility Factors:
- Operating Temperature Range: Minimum -55°C to maximum 150°C or higher
- Moisture Sensitivity Level: MSL 1 (Unlimited)
- Product Status: Active
Substitute parts are grouped into two categories based on peak pulse current capability:
Category A (Equivalent Current Rating): Parts with peak pulse current of 2.9A to 3.6A, maintaining identical clamping voltage and standoff specifications.
Category B (Enhanced Current Rating): Parts with peak pulse current exceeding 3.6A, providing higher transient energy absorption while maintaining voltage compatibility.
Parameter Comparison
| Parameter | SMAJ85AE3/TR13 (Microchip) | SMAJ85A (MDD) | SMAJ85A-13-F (Diodes Inc) | SMAJ85A-TP (MCC) | SMA6J85A-TR (STMicroelectronics) |
|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | MDD | Diodes Incorporated | Micro Commercial Co | STMicroelectronics |
| Voltage - Reverse Standoff (Typ) | 85V | 85V | 85V | 85V | 85V |
| Voltage - Breakdown (Min) | 94.4V | 94.4V | 94.4V | 94.4V | 94V |
| Voltage - Clamping (Max) @ Ipp | 137V | 137V | 137V | 137V | 146V |
| Current - Peak Pulse (10/1000µs) | 3.6A | 2.9A | 2.9A | 2.9A | 22.5A (8/20µs) |
| Power - Peak Pulse | 500W | 400W | 400W | 400W | 600W |
| Package / Case | DO-214AC, SMA | DO-214AC, SMA | DO-214AC, SMA | DO-214AC, SMA | DO-214AC, SMA |
| Operating Temperature | -65 to 150°C (TJ) | -50 to 150°C (TJ) | -55 to 150°C (TJ) | -55 to 175°C (TA) | -55 to 175°C (TJ) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Direct Equivalents (Category A):
The SMAJ85A (MDD), SMAJ85A-13-F (Diodes Incorporated), and SMAJ85A-TP (Micro Commercial Co) are direct functional equivalents to the SMAJ85AE3/TR13. These parts share identical voltage specifications (85V standoff, 137V clamping) and operate within compatible temperature ranges. All three maintain RoHS3 compliance and MSL 1 rating. Selection among these equivalents is based on inventory availability and supply chain requirements, as electrical performance is equivalent.
The SMAJ85A-TP (Micro Commercial Co) offers an extended upper operating temperature limit of 175°C (TA) compared to the original part's 150°C (TJ), providing additional thermal margin in high-temperature environments.
Enhanced Performance Alternative (Category B):
The SMA6J85A-TR (STMicroelectronics) operates within the same 85V voltage class but provides significantly higher peak pulse current (22.5A at 8/20µs) and peak pulse power (600W). This part is suitable for applications requiring greater transient energy absorption while maintaining voltage compatibility. The SMA6J85A-TR also supports an extended operating temperature range of -55 to 175°C. This substitute is appropriate when circuit protection requirements exceed the 3.6A rating of the original part.
All substitute parts are active in production, RoHS3 compliant, and carry MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage practices.
Frequently Asked Questions (FAQ)
Q: Can SMAJ85A (MDD) be used as a direct replacement for SMAJ85AE3/TR13?
A: Yes. The SMAJ85A maintains identical voltage specifications (85V standoff, 137V clamping) and equivalent peak pulse current (2.9A versus 3.6A). Both parts use DO-214AC/SMA packaging and are RoHS3 compliant with MSL 1 rating. The primary difference is the manufacturer and a slightly lower current rating, which is acceptable in applications where the original 3.6A specification provides design margin.
Q: What is the difference between SMAJ85A-13-F and SMAJ85A-TP?
A: Both parts are functionally equivalent with 85V standoff and 137V clamping specifications. The SMAJ85A-13-F (Diodes Incorporated) operates from -55 to 150°C (TJ), while SMAJ85A-TP (Micro Commercial Co) extends to -55 to 175°C (TA). Selection depends on the application's thermal environment and temperature measurement reference (junction versus ambient).
Q: When should SMA6J85A-TR be selected instead of direct equivalents?
A: The SMA6J85A-TR is selected when circuit protection requirements demand higher transient energy absorption. With 22.5A peak pulse current and 600W peak pulse power, this part handles more severe overvoltage events than the 3.6A/500W original specification. Voltage protection characteristics remain identical (85V standoff, 146V clamping), ensuring circuit compatibility.
Q: Are all substitute parts compatible with the same PCB footprint?
A: Yes. All substitute parts use DO-214AC or SMA packaging, which are mechanically and electrically equivalent. PCB footprints, solder pad dimensions, and land patterns are identical across all listed substitutes.
Q: Do substitute parts maintain RoHS3 and REACH compliance?
A: Yes. All substitute parts listed are RoHS3 compliant and carry REACH Unaffected or REACH Unaffected status, matching the compliance profile of the original SMAJ85AE3/TR13.
Q: What is the significance of MSL 1 (Unlimited) rating?
A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All substitute parts carry this rating, eliminating moisture sensitivity concerns in standard manufacturing environments.
Q: Can the SMAJ85AE3/TR13 be replaced with a lower voltage rating TVS diode?
A: No. Substitution is restricted to parts within the 85V voltage class. Lower voltage ratings would trigger premature clamping and alter circuit protection characteristics. All qualified substitutes maintain the 85V standoff specification.
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