BZX84 Zener Diode: Features, Uses, and Specifications

The BZX84 is a popular surface-mount Zener diode series designed for voltage regulation, reference, and protection in electronic circuits. Packaged in a compact SOT-23 package, it is ideal for low-power, space-saving applications. With Zener voltages ranging from 2.4V to 75V, the BZX84 series offers versatility for various design requirements.

✅ Key Features of BZX84

Zener voltage range: 2.4V to 75V (model dependent)

Low power dissipation: Up to 300 mW

Tight tolerance: ±2% or ±5% available

Compact SOT-23 package for surface-mount designs

Low leakage current for stability

Fast response time in voltage clamping

Temperature stability for reliable operation

RoHS-compliant and widely available

Specifications (Typical Values)

Parameter                   Value
Zener Voltage Range    2.4 V – 75 V (variant dependent)
Power Dissipation (PD) 300 mW
Package Type                SOT-23 (Surface Mount)
Tolerance                        ±2% or ±5%
Operating Temperature Range –65 °C to +150 °C
Reverse Leakage Current (IR) < 100 nA (typical)
Zener Impedance Low, depends on voltage rating

BZX84 Series Voltage Variants

Here is a list of some commonly used BZX84 diode variants and their Zener voltages:

Variant	Zener Voltage (VZ)	Typical Use Case
BZX84C2V4	2.4 V	Low-voltage reference, clamping
BZX84C3V3	3.3 V	Logic-level regulation
BZX84C4V7	4.7 V	Signal protection, reference circuits
BZX84C5V1	5.1 V	Common voltage regulator reference
BZX84C6V8	6.8 V	Over-voltage protection
BZX84C9V1	9.1 V	Power supplies, voltage clamping
BZX84C12	12 V	Biasing, power regulation
BZX84C15	15 V	General voltage regulation
BZX84C24	24 V	Industrial applications, higher voltage
BZX84C33	33 V	Surge protection
BZX84C51	51 V	High-voltage regulation circuits
BZX84C75	75 V	High-voltage clamping and protection

Common Applications of BZX84

Voltage regulation in low-power circuits

Voltage reference for analog/digital ICs

Over-voltage protection in consumer electronics

Clamping circuits to protect sensitive inputs

Battery-powered devices for stable operation

Switching power supplies for feedback regulation

Advantages of BZX84

Space-saving SOT-23 package
Wide voltage range availability (2.4V–75V)
Reliable over-voltage protection
Low leakage for high stability
Cost-effective and easy to source

✅ Summary

The BZX84 Zener diode family is an excellent choice for voltage regulation, reference, and protection in compact electronic designs. With variants ranging from 2.4V to 75V, it offers flexibility across consumer electronics, industrial applications, and power management systems. Its low power dissipation (300 mW), compact SOT-23 package, and high reliability make it a preferred diode in modern electronic circuits.

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