Diodes Incorporated BZT52C22S-7-F

Overview

BZT52C22S-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal 22 V zener voltage (20.8–23.3 V range at 5 mA), 200 mW power dissipation, and SOD323 package. It provides precision voltage regulation and overvoltage protection in low-power analog and digital circuits, including power supply reference rails and ESD clamp networks.

For engineers reviewing the BZT52C22S-7-F datasheet, BZT52C22S-7-F pinout, BZT52C22S-7-F application, or BZT52C22S-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), dynamic impedance (55 Ω @ 5 mA), temperature coefficient (+15.4 mV/°C), reverse leakage (<0.1 µA @ 16.4 V), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or line conditions. Its planar die construction ensures consistent breakdown characteristics, while the SOD323 package supports high-density PCB layouts and automated reflow assembly.

The device exhibits a positive temperature coefficient of +15.4 mV/°C, indicating increasing zener voltage with rising junction temperature. Its maximum reverse current is limited to 0.1 µA at VR = 16.4 V, enabling low-quiescent-current biasing in precision reference designs.

Key Specifications

Pinout & Package

Package: SOD323 - surface-mount plastic case with matte tin-plated alloy 42 leadframe, moisture sensitivity level 1, weight ≈ 0.0049 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52C22S-7-F, MMBZ5247BS-7-F offers higher power headroom in a slightly larger package, while BZX384-C22,115 trades AEC-Q101 compliance for marginally better zener impedance (45 Ω) in identical footprint - making the original optimal for automotive-reliability-critical designs.

Availability

BZT52C22S-7-F is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC input protection, and medical diagnostic reference circuits requiring stable component supply and long-term lifecycle support.

Supply support for BZT52C22S-7-F 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 automotive, industrial, and consumer markets.

The BZT52C series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, designed specifically for precision voltage regulation and transient suppression in harsh-environment electronics where stable reference performance and long-term reliability are mandatory.

FAQ

What is the maximum reverse voltage (V_R) at which leakage remains below 0.1 µA?

The BZT52C22S-7-F guarantees reverse leakage <0.1 µA at V_R = 16.4 V, per the Electrical Characteristics table. This value is specified as the test condition for I_R, not an absolute maximum rating - operation above this voltage increases leakage exponentially as the device approaches breakdown.

Can this Zener diode be used in parallel for higher current handling?

No - Zener diodes exhibit manufacturing variations in V_Z and temperature coefficient, causing current imbalance when paralleled. Even matched units risk thermal runaway due to positive TC. For higher current, use a single higher-power Zener or a dedicated shunt regulator IC with current-sharing capability.

Is the SOD323 package compatible with standard reflow profiles for lead-free soldering?

Yes - the device is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260°C and time above liquidus ≤60 seconds. Its moisture sensitivity level 1 eliminates bake requirements prior to assembly, supporting direct placement into standard Pb-free reflow ovens.

Does the +15.4 mV/°C temperature coefficient apply across the full operating range?

Yes - the coefficient is measured and specified over the full –65°C to +150°C junction temperature range. However, its linearity degrades near extremes; typical deviation is <±10% from nominal value at –40°C and +125°C, as confirmed by Figure 2's breakdown curves.