SMBJ28CA-TR

SMBJ28CA-TR is a bidirectional surface-mount transient-voltage-suppressor (TVS) diode in the SMBJ package (DO-214AA). The “28” denotes a nominal standoff voltage around 28 V, and the “CA” suffix indicates bidirectional operation. The “-TR” suffix means tape-and-reel packaging for automated assembly.
Use: to protect DC rails and signal lines from voltage transients, surges, and ESD, especially in 24–28 V automotive, industrial, and telecom systems. It clamps excess voltage and diverts surge current away from the protected circuit.
Key notes:
- Bidirectional: conducts in both polarities when the transient exceeds its breakdown/clamp levels.
- Exact values (VBR, clamp voltage, leakage, Ipp) vary by part and temperature; consult the datasheet for the precise specs.
- Packaging: SMBJ/DO-214AA with TR for automatic placement.
In short, SMBJ28CA-TR is a robust, bidirectional surge protector for 28-V-class systems, supplied in tape-and-reel for easy PCB assembly.

SMBJ28CA-TR is a 1500W bidirectional TVS diode (SMB package, 28V standoff). Common equivalents (same spec in SMB) include:
- Vishay SMBJ28CA
- ON Semiconductor SMBJ28CA
- ProTek SMBJ28CA
- (Other distributors offer the SMBJ28CA variant in reel packaging)

Here are the key features of the SMBJ28CA-TR:
- Bidirectional transient voltage suppressor (CA = bidirectional) in SMB DO-214AA package
- VRWM (working standoff) ≈ 28 V; VBR typically in the ~31–36 V range
- Peak pulse power: 1500 W (10/1000 μs)
- Very fast response time (<1 ns)
- Low leakage in normal operation
- Clamping voltage rises to protect downstream circuitry at overvoltage/high surge
- Temperature range: −55°C to +125°C
- Tape & Reel packaging (-TR) for automated assembly
- RoHS compliant (lead-free)
Typical applications: protecting 28 V rails, CAN/LIN buses, USB/power lines, and other 28 V systems from ESD and surge events.

Two pins (two-terminal device). It is a bidirectional transient voltage suppressor (TVS) diode in the SMB package, used to clamp overvoltage transients and protect circuits from surges.

- Manufacturer: Vishay Intertechnology, Inc.
- What kind of company: A global manufacturer of electronic components, including semiconductors (diodes, transistors, TVS devices) and passive components (resistors, capacitors).

- Protect 24–28 V power rails in automotive, industrial and telecom equipment from surge and load-dump transients.
- Guard DC input stages, DC-DC converters, battery chargers and power adapters against overvoltage events.
- Shield signal/data lines in 28 V systems (CAN, RS-485, other I/O) from transients and ESD.
- Used in solar/renewable-energy electronics, UPS/inverter circuits for transient suppression.
- General PCB protection for consumer electronics with 24–28 V rails.
- TR indicates tape-and-reel packaging for automated assembly.

SMBJ28CA-TR uses the DO-214AB SMB (surface-mount) package, in a Tape‑and‑Reel (TR) carrier.