BZT52H-C18

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BZT52H-C18

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BZT52H SERIES - SINGLE ZENER DIO

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Description

Introduction to BZT52H-C18:
- Type: Zener diode (BZT52H-Cxx family), a small SMT two-terminal device used for voltage regulation and overvoltage protection.
- Zener voltage: nominal 18 V. Tolerances typical ±5%.
- Power rating: approx. 0.5 W at 25°C (derates with temperature).
- Package: compact surface-mount package (commonly SOD-123 sized).
- How it works: reverse-biased; clamps at ~18 V when current exceeds knee/test current; current limited by a series resistor.
- Applications: reference/clamp in power supplies, telecom, and battery-powered circuits.
- Temperature range: -55°C to 125°C.
- Availability: widely stocked from major manufacturers (Vishay, etc.).

Equivalent

Common equivalents for BZT52H-C18 (18 V, ~0.5 W Zener in SOD‑123) from other vendors include:
- BZX84-C18 (SOT‑23, 18 V)
- BZV55-C18 (through‑hole, 18 V)
- other 18 V, 0.5 W Zeners in the same family from NXP/Diodes Inc/Vishay/Rohm
Note: check exact packaging and tolerance to ensure a drop‑in replacement.

Features

Here are the key features of BZT52H-C18:
- Zener diode with nominal breakdown voltage 18 V
- Surface-mount device in a small package (SMD, typically SOD-123)
- Power rating: about 0.5 W (max) at 25°C
- Wide operating temperature range: typically -55°C to +150°C
- RoHS compliant
- Used for voltage regulation, clamping, and reference applications in compact circuits

Pinout

- Pin count: 2 pins (two-terminal device: anode and cathode).
- Function: Zener diode with nominal Zener voltage 18 V, used for voltage regulation/clamping in reverse bias (cathode typically the marked end).

Manufacturer

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

Application

BZT52H-C18 is an 18V Zener diode (SOD-123, about 0.5 W). Common applications:
- 18V reference and shunt regulator in low-cost power supplies
- Rail clamping/protection for 18V DC power lines in consumer, automotive and industrial electronics
- Transient surge suppression and spike protection for sensitive ICs
- Overvoltage protection for microcontrollers, regulators and op-amps
- Noise/spike suppression and voltage stabilization in sensing and telecom interfaces
Suitable for simple, low-cost voltage regulation and protection on 18V rails.

Package

SOD-123 package (SOD-123W variant depending on vendor).

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