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Cart ( If you’re out of SMBJ20CA, the P6SMB20CA is a drop-in replacement—almost identical specs, just slightly higher clamping voltage (34.8V), usually no problem. SMBJ22CA can work if your circuit handles slightly higher voltages, but it’s less precise. The 1.5SMCJ20CA can handle bigger surges (1500W), ideal for motors or power modules, but has a larger package (DO-214AB), meaning PCB layout adjustments are needed.
SMBJ20CA Datasheet, price, pdf SMC Diode Solutions
Explore the comprehensive SMBJ20CA Reference Manual for in-depth technical details and specifications, assisting in your understanding and application of this essential component. Enhance your project's performance with this valuable resource. Discover also the capabilities of the SMBJ20CA for versatile solutions.
- Type: Zener
- Voltage - Reverse Standoff (Typ): 20V
- Power - Peak Pulse: 600W
- Package: DO-214AA, SMB
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SMBJ20CA
The SMBJ20CA is a bidirectional TVS diode perfect for protecting your circuits from voltage spikes and ESD. It operates around 20V, clamps voltages above 22.2V, and handles up to 27.8A pulses, ideal for power lines, communication interfaces, or industrial devices. The SMB package saves space, and the “CA” indicates it’s bidirectional, suited for AC or two-way signals. Simple and reliable!
SMBJ20CA Pinout Polarity
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | A / K (either) | Bidirectional TVS, no fixed polarity, either pin can be connected freely |
| 2 | K / A (either) | Same as above, symmetrical polarity |
The SMBJ20CA is a bidirectional TVS diode, and the best part is you don’t have to worry about polarity—just connect it across your sensitive circuits. If voltage spikes or ESD events exceed ±32.4V, it instantly clamps and diverts current safely to ground. Keep it close to the device you’re protecting, with a solid ground, for the best protection.
SMBJ20CA Equivalent TVS Diode
| Parameter / Model | SMBJ20CA | P6SMB20CA | SMBJ22CA | 1.5SMCJ20CA |
|---|---|---|---|---|
| Package | DO-214AA (SMBJ) | DO-214AA (SMBJ) | DO-214AA (SMBJ) | DO-214AB (SMCJ, larger) |
| Type | Bidirectional TVS | Bidirectional TVS | Bidirectional TVS | Bidirectional TVS |
| Working Voltage VRWM |
20V | 20V | 22V | 20V |
| Breakdown Voltage VBR |
22.2V min | 22.2V min | 24.4V min | 22.2V min |
| Clamping Voltage VC |
32.4V max | 34.8V max | 35.5V max | 32.4V max |
| Peak Pulse Current IPP |
27.8A | 25.1A | 23.5A | 43.5A (strongest) |
| Power Rating (8/20µs) | 600W | 600W | 600W | 1500W (strongest) |
SMBJ20CA Surge Protection Circuit
This circuit is a classic three-stage surge protection design. It first uses a gas discharge tube and MOVs to absorb high-energy surges. Then, a fast-responding TVS diode like SMBJ20CA clamps lower-voltage DC lines (like 24V supplies) to about 32V, preventing damage to downstream sensitive electronics—perfect for industrial and telecom systems.
SMBJ20CA Reverse Voltage Clamp Usage
When you use SMBJ20CA as reverse voltage clamp protection, it quickly clamps any accidental reverse voltage or negative spikes to around ±32.4V, preventing damage. Remember, it’s only suitable for transient events, not continuous reverse voltage. For long-term reverse protection, add a diode or relay. Ideal for 24V systems, like PLC inputs and industrial communication lines.
SMBJ20CA SMD Board Layout
When laying out the SMBJ20CA on your PCB, keep pads about 1.8–2.2mm wide, spaced around 4.6–5.0mm apart, and use thicker copper (≥1oz) for better current handling. Place it close to the input or device you’re protecting, use short and wide traces for quick surge dissipation. If you expect high surges, add extra copper pours or vias for improved heat dissipation and reliability.
SMBJ20CA Power Line Spike Protection
The SMBJ20CA is perfect for protecting 24V DC lines in industrial or automotive systems. If a sudden voltage spike over 22V occurs (like from switching relays or stopping motors), this diode quickly activates and redirects extra current safely to ground, clamping the voltage at around 32.4V. Simply connect it in parallel between the power line and ground, close to the power input for best results.
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