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SMAJ40AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMAJ40AE3/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 in the DO-214AC (SMA) package and is classified as an active product with full RoHS3 compliance. The device provides transient voltage suppression with a 40V reverse standoff voltage and 64.5V maximum clamping voltage at peak pulse current.
Equivalent and substitute parts are identified based on matching electrical characteristics within the 40V reverse standoff voltage class, compatible surface-mount packaging, and active product status. Substitutes maintain functional equivalence for general-purpose TVS diode applications while accommodating variations in clamping voltage, peak pulse current ratings, and operating temperature ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Reverse Standoff Voltage (Typ) | 40 | V |
| Breakdown Voltage (Min) | 44.4 | V |
| Clamping Voltage (Max) @ Ipp | 64.5 | V |
| Peak Pulse Current (10/1000µs) | 7.8 | A |
| Peak Pulse Power | 500 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package Type | DO-214AC (SMA) | Surface Mount |
| Diode Type | Zener | Unidirectional |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ40AE3/TR13 are grouped based on the following substitution criteria:
Primary Matching Parameters:
- Reverse Standoff Voltage: 40V (typical)
- Breakdown Voltage (Min): 44.4V
- Package: DO-214AC (SMA) surface mount
- Diode Type: Zener, unidirectional
- Product Status: Active
- RoHS3 Compliance: Required
Secondary Variation Parameters: Substitutes may vary in clamping voltage (64.5V to 84V range), peak pulse current (6.2A to 48A), peak pulse power (400W to 600W), and operating temperature ranges (-50°C to -55°C minimum, 150°C to 175°C maximum). These variations are acceptable within the general-purpose TVS diode application category, provided the reverse standoff voltage and package type remain constant.
Grouping Logic:
- Group 1 (Direct Equivalents): Parts with 64.5V clamping voltage and 6.2A peak pulse current
- Group 2 (Higher Performance): Parts with elevated clamping voltage (73.6V to 84V) and higher peak pulse current (27A to 48A)
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|
| SMAJ40AE3/TR13 | Microchip Technology | 40 | 44.4 | 64.5 | 7.8 | 500 | -65 to 150 | DO-214AC (SMA) |
| SMAJ40A | MDD | 40 | 44.4 | 64.5 | 6.2 | 400 | -50 to 150 | DO-214AC (SMA) |
| SMAJ40A-13-F | Diodes Incorporated | 40 | 44.4 | 64.5 | 6.2 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMAJ40A-TP | Micro Commercial Co | 40 | 44.4 | 64.5 | 6.2 | 400 | -55 to 175 | DO-214AC (SMA) |
| SMAJ40A-TR | STMicroelectronics | 40 | 44.4 | 84 | 27 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMA6J40A-TR | STMicroelectronics | 40 | 44.4 | 73.6 | 48 | 600 | -55 to 175 | DO-214AC (SMA) |
| SM4T47AY | STMicroelectronics | 40 | 44.4 | 84 | 27 | 400 | -55 to 150 | DO-214AC (SMA) |
Engineering Selection Recommendations
Direct Substitution (Electrical Equivalence):
The SMAJ40A-13-F (Diodes Incorporated) and SMAJ40A-TP (Micro Commercial Co) provide direct electrical substitution with matching 64.5V clamping voltage and 6.2A peak pulse current. Both parts maintain RoHS3 compliance and active product status. The SMAJ40A-TP offers an extended operating temperature range (-55°C to 175°C) compared to the original part (-65°C to 150°C), providing additional thermal margin for high-temperature applications.
Higher Performance Alternatives:
The SMAJ40A-TR and SMA6J40A-TR (both STMicroelectronics) provide enhanced transient suppression capability with higher peak pulse current ratings (27A and 48A respectively) and elevated clamping voltages (84V and 73.6V respectively). These parts are suitable for applications requiring greater energy absorption capacity. The SMA6J40A-TR offers the highest peak pulse power rating (600W) and extended temperature range (-55°C to 175°C).
Packaging and Compliance:
All substitute parts are packaged in DO-214AC (SMA) surface mount format, ensuring mechanical and thermal compatibility with the original SMAJ40AE3/TR13. All listed substitutes maintain RoHS3 compliance and REACH unaffected status, meeting regulatory requirements for commercial and industrial applications.
Inventory Availability:
Selection should consider application-specific requirements for clamping voltage and peak pulse current. The SMAJ40A-13-F (Diodes Incorporated) offers the highest inventory availability (21,847 pcs) among direct equivalents, while the SMA6J40A-TR (STMicroelectronics) provides the highest performance specification with 5,100 pcs in stock.
Frequently Asked Questions (FAQ)
Q: Can SMAJ40A-TP be used as a direct replacement for SMAJ40AE3/TR13?
A: Yes. Both parts share identical reverse standoff voltage (40V), breakdown voltage (44.4V), clamping voltage (64.5V), and peak pulse current (6.2A). The SMAJ40A-TP operates across -55°C to 175°C, which encompasses the original part's -65°C to 150°C range. Both are RoHS3 compliant and packaged in DO-214AC (SMA).
Q: What is the difference between the 64.5V clamping voltage parts and the 84V clamping voltage parts?
A: Parts with 84V clamping voltage (SMAJ40A-TR, SM4T47AY) allow higher transient voltages to pass before clamping, while delivering higher peak pulse current (27A versus 7.8A). These are suitable for applications requiring greater energy dissipation. The 64.5V clamping voltage parts (SMAJ40A, SMAJ40A-13-F, SMAJ40A-TP) provide tighter voltage regulation and are appropriate for sensitive circuit protection.
Q: Are all substitute parts available in the same packaging?
A: Yes. All listed substitute parts use the DO-214AC (SMA) surface mount package, ensuring identical PCB footprint and reflow soldering compatibility with the original SMAJ40AE3/TR13.
Q: Which substitute part has the widest operating temperature range?
A: The SMAJ40A-TP (Micro Commercial Co) and SMA6J40A-TR (STMicroelectronics) both operate from -55°C to 175°C, providing the widest temperature margin. The original SMAJ40AE3/TR13 operates from -65°C to 150°C.
Q: Can I use SMA6J40A-TR in place of SMAJ40AE3/TR13 for general-purpose applications?
A: Yes. The SMA6J40A-TR maintains the required 40V reverse standoff voltage and 44.4V minimum breakdown voltage. The higher clamping voltage (73.6V) and peak pulse current (48A) provide enhanced protection capability. This substitution is suitable for applications where additional transient energy absorption is beneficial or required.
Q: What is the significance of the peak pulse power rating difference?
A: Peak pulse power rating indicates the maximum energy the TVS diode can dissipate during a transient event. The SMAJ40AE3/TR13 is rated for 500W, while most substitutes are rated for 400W or 600W. Higher power ratings accommodate larger transient energy events. Selection should match the expected transient energy profile of the protected circuit.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry RoHS3 compliance certification and REACH unaffected status, meeting regulatory requirements for commercial, industrial, and consumer electronics applications.
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