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SMAJ28CA-TP Equivalent & Substitute Parts
Part Overview
The SMAJ28CA-TP is a transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a 28V reverse standoff voltage and provides 45.4V clamping at peak pulse current, delivering 400W peak pulse power dissipation in a DO-214AC (SMA) package. The part is active in production and ROHS3 compliant. Equivalent and substitute parts are identified to support design flexibility, supply chain alternatives, and application-specific performance requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | SMAJ28CA-TP | — |
| Manufacturer | Micro Commercial Co | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Type | Zener | — |
| Voltage - Reverse Standoff (Typ) | 28 | V |
| Voltage - Breakdown (Min) | 31.1 | V |
| Voltage - Clamping (Max) @ Ipp | 45.4 | V |
| Current - Peak Pulse (10/1000µs) | 8.8 | A |
| Power - Peak Pulse | 400 | W |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature | -55 to 175 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ28CA-TP are classified into two categories based on electrical parameter alignment:
Direct Equivalents maintain identical electrical specifications across all critical parameters: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V maximum clamping voltage at peak pulse current, 8.8A peak pulse current (10/1000µs), and 400W peak pulse power. These parts are functionally interchangeable within the same application circuit without performance deviation.
Similar Alternatives share the same reverse standoff voltage (28V) and breakdown voltage (31.1V) but differ in clamping voltage and/or peak pulse current specifications. These parts are suitable for applications where higher clamping voltage or current handling is acceptable or beneficial, provided the circuit design accommodates the modified electrical characteristics.
The substitution logic is determined by the following key parameters:
- Voltage - Reverse Standoff (Typ): 28V
- Voltage - Breakdown (Min): 31.1V
- Voltage - Clamping (Max) @ Ipp
- Current - Peak Pulse (10/1000µs)
- Power - Peak Pulse
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | RoHS Status | Substitution Type |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ28CA-TP | Micro Commercial Co | 28 | 31.1 | 45.4 | 8.8 | 400 | -55 to 175 | ROHS3 Compliant | Reference Part |
| SMAJ28CA | MDD | 28 | 31.1 | 45.4 | 8.8 | 400 | -50 to 150 | ROHS3 Compliant | Direct Equivalent |
| SMAJ28CA-13-F | Diodes Incorporated | 28 | 31.1 | 45.4 | 8.8 | 400 | -55 to 150 | ROHS3 Compliant | Direct Equivalent |
| SMAJ28CA-E3/61 | Vishay General Semiconductor - Diodes Division | 28 | 31.1 | 45.4 | 8.8 | 400 | -55 to 150 | ROHS3 Compliant | Direct Equivalent |
| SZ1SMA28CAT3G | Littelfuse Inc. | 28 | 31.1 | 45.4 | 8.8 | 400 | -65 to 150 | ROHS3 Compliant | Direct Equivalent |
| SM4T33CAY | STMicroelectronics | 28 | 31.1 | 59 | 39 (8/20µs) | 400 | -55 to 150 | ROHS3 Compliant | Similar Alternative |
| SMA6J28CA-TR | STMicroelectronics | 28 | 31.1 | 51.6 | 68 (8/20µs) | 600 | -55 to 175 | ROHS3 Compliant | Similar Alternative |
| SMAJ28CA-TR | STMicroelectronics | 28 | 31.1 | 59 | 39 (8/20µs) | 400 | -55 to 150 | ROHS3 Compliant | Similar Alternative |
Engineering Selection Recommendations
Direct Equivalents (SMAJ28CA, SMAJ28CA-13-F, SMAJ28CA-E3/61, SZ1SMA28CAT3G) are recommended for one-to-one replacement in existing designs. All direct equivalents maintain the 45.4V clamping voltage and 8.8A peak pulse current specifications. Selection among direct equivalents should prioritize availability, lead time, and supply chain stability. The SZ1SMA28CAT3G variant from Littelfuse includes AEC-Q101 automotive qualification and extended lower operating temperature range (-65°C), making it suitable for automotive and extended temperature applications. The SMAJ28CA-E3/61 from Vishay carries the TransZorb® series designation and is qualified for industrial applications.
Similar Alternatives (SM4T33CAY, SMA6J28CA-TR, SMAJ28CA-TR) are suitable when higher transient current handling or clamping voltage is required. The SM4T33CAY and SMAJ28CA-TR both provide 59V clamping voltage with 39A peak pulse current (8/20µs pulse width), offering enhanced protection margin. The SMA6J28CA-TR provides the highest performance with 51.6V clamping voltage, 68A peak pulse current (8/20µs), and 600W peak pulse power, with operating temperature range matching the reference part (-55°C to 175°C). All similar alternatives are ROHS3 compliant and carry AEC-Q101 automotive qualification where applicable.
Frequently Asked Questions (FAQ)
Q: Can I use SMAJ28CA-13-F as a direct replacement for SMAJ28CA-TP?
A: Yes. Both parts share identical electrical specifications: 28V reverse standoff, 31.1V breakdown, 45.4V clamping, and 8.8A peak pulse current. The primary difference is the manufacturer (Diodes Incorporated vs. Micro Commercial Co) and operating temperature range (-55°C to 150°C vs. -55°C to 175°C). For applications within -55°C to 150°C, this substitution is direct.
Q: What is the difference between direct equivalents and similar alternatives?
A: Direct equivalents maintain identical clamping voltage (45.4V) and peak pulse current (8.8A) specifications. Similar alternatives share the same reverse standoff voltage (28V) but provide higher clamping voltage (51.6V to 59V) and/or higher peak pulse current (39A to 68A). Similar alternatives are suitable when circuit design permits or requires enhanced transient protection.
Q: Is the SZ1SMA28CAT3G suitable for automotive applications?
A: Yes. The SZ1SMA28CAT3G is AEC-Q101 qualified and carries automotive-grade designation. It maintains identical electrical specifications to the reference part and extends the lower operating temperature to -65°C, making it suitable for automotive and harsh environment applications.
Q: Can I substitute SM4T33CAY for SMAJ28CA-TP in my design?
A: Substitution is possible if your circuit design accommodates the higher clamping voltage (59V vs. 45.4V) and higher peak pulse current (39A vs. 8.8A). This part provides enhanced protection margin but may alter circuit behavior. Verify that downstream components tolerate the higher clamping voltage before implementation.
Q: What is the difference between the 10/1000µs and 8/20µs pulse width specifications?
A: The pulse width specification defines the transient event duration used for electrical characterization. The 10/1000µs specification (used for SMAJ28CA-TP and direct equivalents) represents a shorter, sharper transient. The 8/20µs specification (used for similar alternatives) represents a longer transient pulse. Both specifications are valid for TVS diode characterization; selection depends on the actual transient profile in your application.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All direct equivalents and similar alternatives listed are ROHS3 compliant, meeting environmental and regulatory requirements for commercial and industrial applications.
Q: What is the Moisture Sensitivity Level (MSL) for these parts?
A: All parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling. Standard PCB assembly processes are suitable without special precautions.
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