SMAJ54A

SMAJ54A is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMA (DO-214AA) package. It protects 54V DC rails from surges and ESD by remaining reverse-biased during normal operation and clamping the voltage when a spike occurs.
Key points:
- Standoff voltage near 54 V; breakdown typically around 60–66 V (varies by manufacturer); clamping voltage at high current higher.
- High peak pulse power rating (typical hundred of watts range, e.g., ~600 W for 10/1000 µs—check the datasheet for exact values).
- Used on 54V systems: telecom/datacom power rails, industrial/automotive 54V lines, input protection.
- How to connect: cathode to the positive line, anode to ground (unidirectional); ensure proper layout and derating per datasheet.
Note: exact electrical specs vary by manufacturer and revision—consult the SMAJ54A datasheet for precise V_R, V_BR, V_C, and P_P values.

Equivalent parts are 54V unidirectional TVS diodes in the SMA/DO-214AC package from other manufacturers. Examples: Vishay SMBJ54A, ProTek PTVS54A (and other cross‑references from ON Semiconductor, Bourns, etc.).

SMAJ54A features (concise):
- Unidirectional TVS diode in SMA (DO-214AC) package
- Working standoff voltage VRWM ≈ 54 V for 54 V systems
- Peak pulse power: 400 W (8/20 μs)
- Very fast response time; clamps rapidly to protect circuitry
- Broad operating temperature range: typically -55°C to +125°C
- Low leakage at normal voltages; high surge handling
- RoHS compliant, lead-free, surface-mountable
- Suitable for automotive, telecom, and industrial surge/ESD protection
- High reliability in rugged environments and easy PCB integration

- Pin count: 2 pins (DO-214AC SMA package)
- Function: Surface-mount transient-voltage-suppressor (TVS) diode used for surge/ESD protection, clamping high-voltage transients on a line (SMAJ54A ≈ 54 V stand-off).

- Manufacturer: Vishay Intertechnology (Vishay), often listed as Vishay Semiconductors.
- What kind of company: A multinational manufacturer of electronic components and semiconductors (discrete semiconductors, diodes, resistors, capacitors, power devices, etc.).

SMAJ54A is a surface‑mount transient-voltage-suppression (TVS) diode in an SMA package with a 54 V working standoff. It protects 54 V DC rails and related I/O from surges/ESD.
Common application areas:
- Telecom/datacom equipment with 48–54 V supplies
- Industrial controls and motor drives
- Automotive/EV charging circuits
- Solar inverters and battery-management systems
- General power-supply input protection

SMAJ54A uses the SMA package (DO-214AC), a surface-mount TVS diode.