SMBJ12CA-E3/52

SMBJ12CA-E3/52 is a transient voltage suppressor (TVS) diode in the SMBJ package (DO-214AA). It provides surge and ESD protection for DC rails and signal lines by clamping harmful voltage spikes.
Key points:
- Type: Bidirectional TVS (the “CA” suffix indicates bidirectional operation).
- Stand-off voltage: about 12 V (Vrwm ≈ 12 V); clamping and exact VBR vary with current.
- Power rating: commonly around 600 W peak pulse (10/1000 µs) for the SMBJ family.
- Package: SMBJ; suitable for surface-mount PCB designs.
- Typical use: automotive/industrial power rails, telecom/Data lines, USB, microcontroller inputs, and any vulnerable high-speed line requiring transient protection.
The “E3/52” suffix relates to the specific automotive/industrial grade variant, date/lot code, and packaging options. For precise electrical specs (VBR, leakage, capacitance, clamping voltage at a given current), consult the manufacturer’s datasheet for SMBJ12CA-E3/52.

Equivalents (12 V, bidirectional, 600 W, SMB package):
- Littelfuse SMBJ12CA
- ON Semiconductor SM6T12CA
- STMicroelectronics SMBJ12CA
- ProTek Devices PSMBJ12CA
Note: exact die/grade (E3/52) may vary by supplier; check for automotive/industrial spec when cross-referencing.

SMBJ12CA-E3/52 features (concise):
- Bidirectional TVS diode in SMB (DO-214AA) package
- 600 W peak pulse power (10/1000 μs)
- Stand-off voltage Vwm ≈ 12 V; breakdown around ~12–14 V
- Clamping voltage typically ~20–22 V at IPP = 1 A
- Very fast response for surge/ESD protection
- Operating temperature: -55°C to 125°C
- RoHS-compliant, lead-free; high reliability
- Surface-mount, compact SMB package; suitable for board protection
- 100% tested with regional lot/date code (E3/52)
Note: Values are typical/specifying ranges; refer to the exact datasheet for exact VBR/Vclamp tolerances.

- Pin count: 2 terminals (DO-214AB SMB package)
- Function: Bidirectional transient voltage suppression (TVS) diode used to protect circuits from surge/ESD on lines, with about 12 V working standoff.

Manufacturer: Littelfuse, Inc.
What kind of company: An American multinational that designs and manufactures circuit-protection products (fuses, TVS diodes, ESD protection, surge protection and related components).

SMBJ12CA-E3/52 is a 12 V bidirectional TVS diode (high-energy surge protector) for protection of 12 V DC rails and lines.
Common applications:
- Automotive 12 V electrical systems (ECUs, sensors, infotainment)
- Industrial equipment and motor-drive 12 V rails
- Power adapters and DC-DC converter inputs
- Telecom/network gear with 12 V supplies
- Solar/battery-powered devices needing robust bidirectional surge protection
It clamps bidirectionally to protect against positive and negative transients on 12 V systems.

SMBJ12CA-E3/52 uses the SMB package (DO-214AA) – a surface-mount transient-voltage-suppressor package.