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SMAJ40CE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMAJ40CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This bidirectional Zener diode operates with a 40V reverse standoff voltage and provides clamping at 71.4V maximum, with a peak pulse current rating of 7A and 500W peak pulse power dissipation. The device is housed in a DO-214AC (SMA) surface mount package and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).
The SMAJ40CE3/TR13 is currently in active product status. Equivalent and substitute parts are identified based on matching or compatible electrical and mechanical parameters, enabling direct replacement or functional equivalence in circuit designs where the specified performance characteristics are maintained.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 40 | V |
| Voltage - Breakdown (Min) | 44.4 | V |
| Voltage - Clamping (Max) @ Ipp | 71.4 | V |
| Current - Peak Pulse (10/1000µs) | 7 | A |
| Power - Peak Pulse | 500 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | — |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ40CE3/TR13 are grouped based on the following critical parameters that determine functional equivalence:
Primary Matching Criteria:
- Voltage - Reverse Standoff (Typ): 40V
- Voltage - Breakdown (Min): 44.4V
- Package / Case: DO-214AC, SMA
- Type: Zener, Bidirectional
- Bidirectional Channels: 1
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Secondary Compatibility Parameters:
- Voltage - Clamping (Max) @ Ipp: 64.5V to 84V (acceptable range for general-purpose protection)
- Current - Peak Pulse (10/1000µs): 6.2A to 48A (higher ratings provide enhanced protection margin)
- Power - Peak Pulse: 400W to 600W (higher ratings provide enhanced dissipation capability)
- Operating Temperature Range: -55°C to 175°C (compatible with or exceeding the main part specification)
All substitute parts maintain the same reverse standoff voltage, breakdown voltage, and package form factor, ensuring direct mechanical and electrical compatibility. Variations in clamping voltage, peak pulse current, and power dissipation reflect different manufacturer designs while maintaining the core 40V protection function.
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 |
|---|---|---|---|---|---|---|---|---|
| SMAJ40CE3/TR13 | Microchip Technology | 40 | 44.4 | 71.4 | 7 | 500 | -65 to 150 | DO-214AC (SMA) |
| SM4T47CAY | STMicroelectronics | 40 | 44.4 | 84 | 27 (8/20µs) | 400 | -55 to 150 | DO-214AC (SMA) |
| SMA6J40CA-TR | STMicroelectronics | 40 | 44.4 | 73.6 | 48 (8/20µs) | 600 | -55 to 175 | DO-214AC (SMA) |
| SMAJ40CA | Good-Ark Semiconductor | 40 | 44.4 | 64.5 | 6.2 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMAJ40CA-13-F | Diodes Incorporated | 40 | 44.4 | 64.5 | 6.2 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMAJ40CA-E3/5A | Vishay General Semiconductor - Diodes Division | 40 | 44.4 | 64.5 | 6.2 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMAJ40CA-TP | Micro Commercial Co | 40 | 44.4 | 64.5 | 6.2 | 400 | -55 to 175 | DO-214AC (SMA) |
| SMAJ40CA-TR | STMicroelectronics | 40 | 44.4 | 84 | 27 (8/20µs) | 400 | -55 to 150 | DO-214AC (SMA) |
| SZ1SMA40CAT3G | Littelfuse Inc. | 40 | 44.4 | 64.5 | 6.2 | 400 | -65 to 150 | DO-214AC (SMA) |
Engineering Selection Recommendations
All identified substitute parts maintain the core electrical specifications required for 40V protection applications: reverse standoff voltage of 40V, breakdown voltage minimum of 44.4V, and DO-214AC (SMA) surface mount packaging. Selection among these alternatives is based on the following engineering considerations:
Direct Electrical Equivalents (Matched Clamping Voltage and Current):
- SMAJ40CA (Good-Ark Semiconductor)
- SMAJ40CA-13-F (Diodes Incorporated)
- SMAJ40CA-E3/5A (Vishay General Semiconductor - Diodes Division)
- SMAJ40CA-TP (Micro Commercial Co)
- SZ1SMA40CAT3G (Littelfuse Inc.)
These parts provide 64.5V clamping voltage and 6.2A peak pulse current, closely matching the SMAJ40CE3/TR13 performance profile. All are ROHS3 compliant with MSL 1 rating. The SMAJ40CA-TP and SZ1SMA40CAT3G extend the operating temperature range to -55°C to 175°C and -65°C to 150°C respectively, offering enhanced thermal performance in specific applications.
Enhanced Protection Alternatives (Higher Current and Power Ratings):
- SM4T47CAY (STMicroelectronics) - 27A peak pulse current, 400W power dissipation, AEC-Q101 automotive qualified
- SMA6J40CA-TR (STMicroelectronics) - 48A peak pulse current, 600W power dissipation, extended temperature range to 175°C
- SMAJ40CA-TR (STMicroelectronics) - 27A peak pulse current, 400W power dissipation
These alternatives provide higher current handling and power dissipation capabilities, suitable for applications requiring enhanced transient protection margins. The STMicroelectronics TRANSIL™ series parts (SM4T47CAY, SMA6J40CA-TR, SMAJ40CA-TR) offer automotive-grade qualification where applicable.
Compliance and Certification: All substitute parts are ROHS3 compliant and REACH unaffected. The SM4T47CAY and SZ1SMA40CAT3G carry AEC-Q101 automotive qualification, enabling use in automotive and industrial applications requiring formal qualification standards.
Frequently Asked Questions (FAQ)
Q: Can SMAJ40CA substitute directly for SMAJ40CE3/TR13?
A: Yes. The SMAJ40CA from Good-Ark Semiconductor provides direct electrical and mechanical compatibility. Both devices maintain 40V reverse standoff voltage, 44.4V minimum breakdown voltage, and DO-214AC (SMA) packaging. The SMAJ40CA operates across -55°C to 150°C, which is compatible with the SMAJ40CE3/TR13 operating range of -65°C to 150°C.
Q: What is the difference between the 64.5V and 84V clamping voltage options?
A: The clamping voltage determines the maximum voltage level the TVS diode allows across the protected circuit during a transient event. The SMAJ40CE3/TR13 clamps at 71.4V maximum. Substitute parts with 64.5V clamping (SMAJ40CA, SMAJ40CA-13-F, SMAJ40CA-E3/5A, SMAJ40CA-TP, SZ1SMA40CAT3G) provide tighter voltage regulation, while 84V clamping options (SM4T47CAY, SMAJ40CA-TR, SMA6J40CA-TR) allow higher transient voltages. Selection depends on the specific circuit protection requirements.
Q: Are all substitute parts available in the same packaging?
A: Yes. All identified substitute parts use DO-214AC (SMA) surface mount packaging, ensuring mechanical compatibility with the SMAJ40CE3/TR13. Packaging variations exist only in tape format (Tape & Reel versus Cut Tape & Digi-Reel®), which does not affect component functionality or circuit performance.
Q: Which substitute offers the highest current handling capability?
A: The SMA6J40CA-TR from STMicroelectronics provides the highest peak pulse current rating at 48A (8/20µs) and 600W peak pulse power dissipation. This part is suitable for applications requiring maximum transient energy absorption within the 40V protection class.
Q: Can I use a substitute part with a higher operating temperature range?
A: Yes. Substitute parts with extended operating temperature ranges (such as SMAJ40CA-TP at -55°C to 175°C or SMA6J40CA-TR at -55°C to 175°C) are fully compatible with applications designed for the SMAJ40CE3/TR13 (-65°C to 150°C). The extended range provides additional thermal margin without compromising functionality.
Q: Are automotive-qualified alternatives available?
A: Yes. The SM4T47CAY (STMicroelectronics) and SZ1SMA40CAT3G (Littelfuse Inc.) carry AEC-Q101 automotive qualification, enabling use in automotive and industrial applications requiring formal qualification standards. Both maintain the 40V reverse standoff voltage and DO-214AC (SMA) packaging.
Q: What is the significance of the MSL 1 (Unlimited) moisture sensitivity rating?
A: MSL 1 indicates unlimited shelf life and moisture sensitivity, meaning the component does not require special moisture control during storage or handling. All identified substitute parts maintain MSL 1 rating, ensuring consistent handling and storage requirements across all alternatives.
Q: How do I select between multiple substitute options?
A: Selection criteria include: (1) clamping voltage requirement—use 64.5V options for tighter regulation or 84V options for higher transient tolerance; (2) current handling—use higher-rated parts (27A or 48A) for applications with severe transient conditions; (3) temperature range—select extended-range parts for extreme thermal environments; (4) qualification requirements—use AEC-Q101 qualified parts for automotive applications; (5) manufacturer preference and supply chain availability.
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