Overview
The SMAJ24CA is a widely adopted bidirectional Transient Voltage Suppression (TVS) diode used across industrial, automotive, power supply, and communication systems. As a generic industry-standard part number, the SMAJ24CA is manufactured by multiple reputable suppliers such as STMicroelectronics, Vishay, YAGEO, MDD, Littelfuse, Bourns, and others.
Although device branding varies by manufacturer, the functional role and application intent remain consistent: fast and reliable suppression of transient voltage spikes, lightning surges, and inductive load switching disturbances. In practical engineering applications, designers select SMAJ24CA primarily based on electrical parameters, ensuring the chosen supplier meets the required surge capability, clamping characteristics, and reliability standards.
Core Parameters
| Parameter | Value |
|---|---|
| Device Type | Bidirectional TVS Diode |
| Working Peak Reverse Voltage (V_RWM) | 24 V |
| Breakdown Voltage (V_BR) | 26.7 – 29.5 V |
| Clamping Voltage (V_C @ I_PP) | 38.9 V |
| Peak Pulse Power (P_PP, 10/1000 µs) | 400 W |
| Peak Pulse Current (I_PP) | ~6.4 A |
| Reverse Leakage Current (I_R) | <5 µA |
| Package | SMA (DO-214AC) |
Features
- Bidirectional transient protection
- 400 W peak pulse power with 10/1000 µs waveform
- Fast response time to surge and ESD events
- Low reverse leakage, suitable for power-sensitive circuits
- Stable performance for long-term industrial operation
- Compact SMA package compatible with automated reflow
- Available from multiple global manufacturers
Typical Application Scenarios
| Application | Description |
|---|---|
| Industrial Modules | Surge suppression on supply rails and I/O lines |
| Communication Systems | Data lines and RF interface protection |
| Power Supply Lines | DC bus, adapter input, and converter protection |
| Automotive Electronics | Applicable to 12 V/24 V systems and control units |
| Consumer Devices | Battery interface, charger ports, and adapter protection |
Performance Comparison
| Specification | SMAJ24CA | TVS Model A | TVS Model B |
|---|---|---|---|
| Working Voltage | 24 V | 24 V | 22 V |
| Peak Pulse Power | 400 W | 300 W | 400 W |
| Clamping Voltage | 38.9 V | 42 V | 40 V |
| Pulse Current | 6.4 A | 5.5 A | 6 A |
| Leakage | <5 µA | <10 µA | <8 µA |
The SMAJ24CA shows strong surge capability, competitive clamping performance, and low leakage, making it one of the most commonly used TVS diodes in 24 V bus protection.
Conclusion
The SMAJ24CA remains a reliable and widely supported TVS diode family offered by multiple well-established manufacturers. Because the SMAJ24CA is an industry-standard part number, engineers typically evaluate devices based on detailed datasheet parameters such as clamping voltage, surge capability, leakage current, and package compliance rather than brand alone. With its robust 400 W surge rating, fast response, and broad supplier availability, it is an excellent fit for industrial, power, communication, and automotive designs requiring dependable transient suppression.
Manufacturer Profile
The SMAJ24CA is produced by several global semiconductor manufacturers, including STMicroelectronics, Vishay, YAGEO, MDD, Littelfuse, and Bourns. Each supplier follows the standardized SMAJ24CA electrical definition, though minor variations may occur in clamping performance, thermal resistance, and surge ratings. Selection should always reference actual datasheet parameters to ensure compatibility with the intended application environment.
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