Diodes Incorporated LZ52C20W

Overview

LZ52C20W from Diodes Incorporated is a surface-mount Zener diode with a nominal reverse breakdown voltage of 20 V, ±2% tolerance, 500 mW power dissipation, and 55 Ω dynamic impedance at 5 mA test current. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.

For engineers reviewing the LZ52C20W datasheet, LZ52C20W pinout, LZ52C20W application, or LZ52C20W equivalent, key selection criteria include its 1206 package footprint, 19.6–20.4 V Zener range at 5 mA, 0.1 µA maximum reverse leakage at 15 V, thermal resistance of 300 °C/W, and RoHS-compliant lead-free plating.

Technical Context

This device operates as a silicon epitaxial planar Zener diode optimized for stable voltage regulation under DC or low-frequency transient conditions. Its 2% V_Z tolerance and low 55 Ω Zener impedance at I_ZT = 5 mA support tight regulation in reference and protection circuits.

The 1206 package enables high-density PCB layouts while maintaining 500 mW power handling at T_A = 25 °C, with derating to zero at 150 °C ambient. Reverse leakage remains ≤0.1 µA up to 15 V, ensuring minimal quiescent current draw in battery-sensitive designs.

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-C20 and MMSZ5248B, LZ52C20W delivers tighter 2% tolerance and lower 55 Ω Z_ZT in a robust 1206 package-making it optimal for precision voltage referencing where stability and thermal margin are critical.

Availability

LZ52C20W is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision voltage reference applications requiring stable component supply and RoHS-compliant sourcing.

Supply support for LZ52C20W 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, industry-standard components for power management, signal integrity, and protection.

The LZ52C series belongs to Diodes' surface-mount Zener diode product line, engineered for precision voltage regulation and transient suppression in space-constrained, thermally demanding applications.

FAQ

What is the maximum reverse voltage that LZ52C20W can safely clamp?

LZ52C20W is rated for continuous reverse operation up to its specified Zener voltage range of 19.6–20.4 V at 5 mA. It may withstand brief transients above this level, but sustained reverse bias beyond 20.4 V risks thermal runaway unless current is strictly limited by external series resistance to maintain P_TOT ≤ 500 mW.

Does LZ52C20W require a heatsink in standard 1206 PCB layouts?

No heatsink is required for LZ52C20W in standard FR-4 PCB layouts with minimum recommended copper pour. Its 300 °C/W R_θJA assumes standard JEDEC 2-layer test board conditions; at 500 mW dissipation, junction temperature rise is ~150 °C above ambient-so operation is limited to ≤25 °C ambient for safe 100% power use. Derating is mandatory above 25 °C.

How does the ±2% tolerance affect design margin in a 20 V reference circuit?

The ±2% tolerance means actual V_Z falls between 19.6 V and 20.4 V at 5 mA. In a feedback divider, this introduces ±0.4 V absolute error at the reference node. For a 5 V output regulated via optocoupler + TL431, this translates to ~±1% output variation-acceptable for most industrial supplies but insufficient for metrology-grade references.

Is LZ52C20W suitable for automotive applications per AEC-Q200?

No-LZ52C20W is not AEC-Q200 qualified. While its operating temperature range (–65 to +175 °C) exceeds automotive requirements, Diodes Incorporated does not list this part in its AEC-Q200 qualified portfolio. For automotive use, consider the AEC-Q200–qualified BZX84-A20 or MMBZ5248AL series instead.