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SMAJ15CE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMAJ15CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for surface mount applications in the DO-214AC (SMA) package. This bidirectional zener diode provides transient overvoltage protection with a 15V reverse standoff voltage and 26.9V maximum clamping voltage at peak pulse current of 18.8A. The component is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).
Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining the same package type and mounting configuration. Alternative sources provide design flexibility, supply chain redundancy, and component availability across multiple manufacturers.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 15 | V |
| Voltage - Breakdown (Min) | 16.7 | V |
| Voltage - Clamping (Max) @ Ipp | 26.9 | V |
| Current - Peak Pulse (10/1000µs) | 18.8 | A |
| Power - Peak Pulse | 500 | W |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature Range | -65°C ~ 150°C | TJ |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ15CE3/TR13 are qualified based on the following electrical and mechanical criteria:
Critical Matching Parameters:
- Voltage - Reverse Standoff (Typ): 15V
- Voltage - Breakdown (Min): 16.7V
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
- Type: Zener, Bidirectional (1 channel)
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Allowable Variation Parameters:
- Voltage - Clamping (Max) @ Ipp: 24.4V to 32.5V (within circuit protection requirements)
- Current - Peak Pulse (10/1000µs): 16.4A to 123A (higher current capability acceptable for same voltage class)
- Power - Peak Pulse: 400W to 600W (higher power dissipation acceptable)
- Operating Temperature Range: -55°C to -65°C minimum; 150°C to 175°C maximum (extended ranges acceptable)
Substitute parts maintain identical reverse standoff and breakdown voltage specifications to ensure proper circuit protection thresholds. Variations in clamping voltage, peak pulse current, and power dissipation are acceptable when the substitute part provides equal or superior performance characteristics for the protected circuit.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ15CE3/TR13 | Microchip Technology | 15V | 16.7V | 26.9V | 18.8A | 500W | -65°C ~ 150°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
| SM4T18CAY | STMicroelectronics | 15V | 16.7V | 32.5V | 71A (8/20µs) | 400W | -55°C ~ 150°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
| SMA6J15CA-TP | Micro Commercial Co | 15V | 16.7V | 24.4V | 24.6A | 600W | -55°C ~ 175°C (TA) | DO-214AC, SMA | ROHS3 Compliant |
| SMA6J15CA-TR | STMicroelectronics | 15V | 16.7V | 27.7V | 123A (8/20µs) | 600W | -55°C ~ 175°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
| SMAJ15CA | EVVO Semi | 15V | 16.7V | 24.4V | 16.4A | 400W | -65°C ~ 150°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
| SMAJ15CA-13-F | Diodes Incorporated | 15V | 16.7V | 24.4V | 16.4A | 400W | -55°C ~ 150°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
| SMAJ15CA-E3/5A | Vishay General Semiconductor - Diodes Division | 15V | 16.7V | 24.4V | 16.4A | 400W | -55°C ~ 150°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
| SMAJ15CA-TP | Micro Commercial Co | 15V | 16.7V | 24.4V | 16.4A | 400W | -55°C ~ 175°C (TA) | DO-214AC, SMA | ROHS3 Compliant |
| SMAJ15CA-TR | STMicroelectronics | 15V | 16.7V | 32.5V | 71A (8/20µs) | 400W | -55°C ~ 150°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
| SZ1SMA15CAT3G | Littelfuse Inc. | 15V | 16.7V | 24.4V | 16.4A | 400W | -65°C ~ 150°C (TJ) | DO-214AC, SMA | ROHS3 Compliant |
Engineering Selection Recommendations
All identified substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original SMAJ15CE3/TR13 component.
Electrical Performance Equivalence: All substitute parts share identical reverse standoff voltage (15V) and breakdown voltage (16.7V minimum), ensuring equivalent circuit protection thresholds. Clamping voltage variations (24.4V to 32.5V) remain within acceptable transient suppression ranges for 15V nominal circuits. Peak pulse current ratings range from 16.4A to 123A, with higher ratings providing enhanced transient energy absorption capability.
Temperature Operating Range: The original part operates from -65°C to 150°C (TJ). Substitute parts maintain minimum operating temperatures between -55°C and -65°C, with maximum temperatures extending to 150°C or 175°C. Extended upper temperature limits (175°C) provide additional thermal margin in high-temperature applications.
Manufacturer Certifications: STMicroelectronics parts (SM4T18CAY, SMA6J15CA-TR, SMAJ15CA-TR) carry AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability standards. Littelfuse SZ1SMA15CAT3G also carries AEC-Q101 qualification.
Supply Chain Considerations: Inventory availability varies significantly across manufacturers. EVVO Semi SMAJ15CA offers highest inventory (121,300 pcs), while STMicroelectronics SMAJ15CA-TR provides 180,200 pcs. Microchip Technology SMAJ15CE3/TR13 maintains 736 pcs in stock.
Packaging Compatibility: All substitute parts utilize DO-214AC (SMA) surface mount package with identical footprint and soldering requirements. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging options are available across manufacturers, supporting both automated and manual assembly processes.
Frequently Asked Questions (FAQ)
Q: Can I substitute SMAJ15CA-TR for SMAJ15CE3/TR13 in my circuit?
A: Yes. Both parts maintain 15V reverse standoff voltage and 16.7V minimum breakdown voltage. SMAJ15CA-TR provides higher peak pulse current (71A vs. 18.8A) and clamping voltage (32.5V vs. 26.9V), delivering superior transient suppression capability. Operating temperature range (-55°C to 150°C) is compatible with the original part's -65°C to 150°C specification for most applications.
Q: What is the difference between 24.4V and 32.5V clamping voltage?
A: Clamping voltage represents the maximum voltage across the TVS diode during transient suppression at peak pulse current. Lower clamping voltage (24.4V) provides tighter voltage regulation but handles lower peak currents. Higher clamping voltage (32.5V) accommodates higher transient currents while allowing slightly higher voltage peaks. Both values protect 15V nominal circuits effectively.
Q: Are all substitute parts automotive-qualified?
A: Not all. STMicroelectronics parts (SM4T18CAY, SMA6J15CA-TR, SMAJ15CA-TR) and Littelfuse SZ1SMA15CAT3G carry AEC-Q101 automotive qualification. Other manufacturers (Microchip Technology, EVVO Semi, Diodes Incorporated, Vishay, Micro Commercial Co) do not list automotive qualification for their 15V TVS diodes. Automotive applications require AEC-Q101 qualified components.
Q: Can I use a part with lower peak pulse current rating?
A: SMAJ15CA (16.4A) and SMAJ15CA-13-F (16.4A) have lower peak pulse current ratings than the original SMAJ15CE3/TR13 (18.8A). These parts are suitable only if your circuit's transient energy does not exceed their rated capability. Higher current transients may cause component failure or inadequate voltage suppression.
Q: What is the significance of operating temperature range differences?
A: The original part operates from -65°C to 150°C (TJ). Substitute parts range from -55°C to 175°C. Lower minimum temperatures (-65°C) are required for extreme cold environments. Extended maximum temperatures (175°C) provide thermal margin in high-temperature applications. Standard industrial applications typically operate within -40°C to 85°C, making most substitutes acceptable.
Q: Are Cut Tape and Tape & Reel packaging interchangeable?
A: Both packaging formats contain identical components in DO-214AC (SMA) packages. Tape & Reel (TR) packaging supports automated pick-and-place assembly with continuous reel feeding. Cut Tape (CT) & Digi-Reel® packaging accommodates manual assembly and lower-volume production. Component electrical performance is identical; packaging selection depends on assembly process requirements.
Q: Why do some parts list different pulse test conditions (10/1000µs vs. 8/20µs)?
A: Peak pulse current ratings depend on the test waveform used. The 10/1000µs waveform represents a slower transient pulse, while 8/20µs represents a faster transient. STMicroelectronics parts specify 8/20µs testing, which typically results in higher measured peak current values (71A, 123A) compared to 10/1000µs testing. Both test methods are industry-standard; direct current comparison requires identical test conditions.
Q: Is REACH compliance status important for my application?
A: REACH compliance status indicates regulatory approval for use in European Union markets. SMAJ15CE3/TR13 is REACH Unaffected. Most substitute parts are also REACH Unaffected, except SMAJ15CA-13-F (REACH Affected). For EU market applications, verify REACH status with your supplier. Non-EU applications are not affected by REACH compliance status.
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