Diodes Incorporated LZ52C30W

Overview

LZ52C30W from Diodes Incorporated is a surface-mount Zener diode with a nominal reverse breakdown voltage of 30 V (29.4–30.6 V at 5 mA), 500 mW power dissipation, and ±2% V_Z tolerance. It operates in 1206 package, delivers low leakage (<0.1 µA at 22 V), and serves as a precision voltage reference or overvoltage clamp in DC power rails and analog signal conditioning circuits.

For engineers reviewing the LZ52C30W datasheet, LZ52C30W pinout, LZ52C30W application, or LZ52C30W equivalent, key selection criteria include its 30 V Zener voltage window, 80 Ω dynamic impedance at test current, thermal resistance of 300 °C/W, and compatibility with automated 1206 SMT assembly for industrial power monitoring and sensor biasing.

Technical Context

This Zener diode uses silicon epitaxial planar construction to achieve stable reverse breakdown with tight 2% V_Z tolerance and low temperature coefficient. Its 1206 footprint supports high-density PCB layouts while maintaining 500 mW steady-state power handling at 25 °C ambient.

The device exhibits 80 Ω Zener impedance at 5 mA test current and 220 Ω at knee current (1 mA), enabling predictable regulation under light-load and transient conditions. Reverse leakage remains ≤0.1 µA up to 22 V, ensuring minimal quiescent current draw in battery-sensitive applications.

Key Specifications

Pinout & Package

Package: 1206 surface-mount ceramic body with cathode indicated by color band; terminals are lead-free plated; weight ≈10 mg.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Compared with BZX84-C30 and MMSZ5256ET1G, LZ52C30W uniquely combines 1206 mechanical robustness, 500 mW DC rating, and ±2% V_Z tolerance-making it optimal for industrial power monitoring where long-term stability and manufacturability are prioritized over ultra-miniaturization.

Availability

LZ52C30W is available at Aetrix Electronics and suitable for industrial power monitoring, automotive sensor biasing, IoT node voltage regulation, and test equipment protection requiring stable component supply and full RoHS/Green compliance.

Supply support for LZ52C30W includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, automotive, and computing markets.

The LZ52C series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference and overvoltage protection in surface-mount power management applications demanding tight tolerance and environmental compliance.

FAQ

What is the maximum continuous power dissipation for LZ52C30W at 70 °C ambient?

At 70 °C ambient, the maximum continuous power dissipation is 333 mW. This is derived from the 500 mW rating at 25 °C and the 300 °C/W thermal resistance: derating begins at 25 °C, reducing power by (70 − 25) × (1/300) = 0.15 W per °C, resulting in 500 mW − 167 mW = 333 mW.

Does LZ52C30W have a specified Zener knee current or minimum operating current?

Yes - the datasheet specifies Zener impedance at I_ZK = 1.0 mA, with maximum Z_ZK = 220 Ω. While no explicit minimum operating current is given, stable regulation is achieved above 0.25 mA based on typical V_Z vs. I_Z curves in DS45096 Rev. 7–3.

Is LZ52C30W suitable for bidirectional ESD protection?

No - LZ52C30W is a unidirectional Zener diode optimized for reverse-bias voltage regulation and clamping. It lacks symmetric breakdown characteristics required for bidirectional ESD protection; dedicated TVS diodes such as D1213A-03SO or PUSB3FR4 are recommended for that function.

How does the 1206 package affect solder joint reliability compared to smaller packages like SOD-123?

The 1206 package provides larger pad area and higher mechanical mass, improving resistance to thermal cycling stress and board flexure. Its 3.2 × 1.6 mm footprint offers greater solder volume retention than SOD-123, enhancing long-term reliability in industrial environments with wide temperature swings and vibration exposure.