Diodes Incorporated BZT52C20S-7

Overview

BZT52C20S-7 from Diodes Incorporated is a surface-mount Zener diode with a nominal zener voltage of 20 V, ±5% tolerance (18.8–21.2 V), 200 mW power dissipation, and SOD323 package. It operates over −65 °C to +150 °C and delivers stable voltage regulation in low-power biasing and reference circuits, such as sensor supply rails and microcontroller reset thresholds.

For engineers reviewing the BZT52C20S-7 datasheet, BZT52C20S-7 pinout, BZT52C20S-7 application, or BZT52C20S-7 equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, dynamic impedance (55 Ω @ I_ZT), reverse leakage (<0.1 µA @ 14.4 V), temperature coefficient (+14.0 mV/°C), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode uses planar die construction for stable breakdown characteristics and low noise performance. Its cathode-band polarity and matte tin-plated alloy 42 leadframe ensure compatibility with automated SMT assembly and RoHS-compliant reflow profiles.

The device exhibits a typical zener impedance of 55 Ω at 5 mA and 225 Ω at 1 mA, enabling precise voltage clamping in feedback loops and overvoltage protection. Thermal resistance is 625 °C/W on FR-4 PCB with recommended pad layout, limiting junction temperature rise under continuous DC operation.

Key Specifications

Pinout & Package

SOD323 is a two-terminal surface-mount package with cathode indicated by a band on the top surface. The device has no internal circuitry beyond the PN junction; terminals are anode and cathode only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5244ET1G and BZX384-C20, BZT52C20S-7 offers tighter integration of AEC-Q101 compliance, SOD323 miniaturization, and optimized 200 mW/55 Ω balance for precision biasing-making it preferred for automotive and portable instrumentation where size, reliability, and regulation stability are jointly critical.

Availability

BZT52C20S-7 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial current-loop transmitters, and portable test equipment requiring stable component supply and full traceability.

Supply support for BZT52C20S-7 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The BZT52 series belongs to Diodes' high-reliability Zener diode product line, engineered specifically for voltage reference, regulation, and overvoltage protection in automotive, industrial, and consumer systems demanding AEC-Q101 validation and green material compliance.

FAQ

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

The BZT52C20S-7 guarantees reverse leakage <0.1 µA at V_R = 14.4 V, as specified in the Electrical Characteristics table. This value corresponds to 72% of nominal V_Z, ensuring minimal current draw in high-impedance bias networks before breakdown onset.

Can this Zener diode be used in parallel for higher power dissipation?

No-parallel connection is not recommended due to mismatched zener voltages causing current hogging. Each unit's ±5% V_Z tolerance and positive temperature coefficient mean one device will dominate conduction, risking thermal runaway even with matched units.

Is the SOD323 package compatible with standard 0805 reflow profiles?

Yes-the SOD323 package (1.3 mm × 1.7 mm) fits within 0805 land patterns and withstands IPC/JEDEC J-STD-020 Level 1 moisture sensitivity limits. Its matte tin finish ensures reliable solder wetting using standard SnPb or lead-free reflow cycles.

How does the +14.0 mV/°C temperature coefficient affect long-term reference stability?

The +14.0 mV/°C TC means V_Z increases ~140 mV over a 10 °C rise. In a 20 V reference, that's 0.7% drift-acceptable for non-critical biasing but requires compensation (e.g., complementary NTC network) in metrology-grade applications.