Diodes Incorporated DDZ39BSF-7

Overview

DDZ39BSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 36.3 V (min 35.36 V, max 37.19 V) at 5 mA test current, 85 Ω dynamic impedance, and ±0.2 µA reverse leakage at 30 V. It delivers tight voltage tolerance for voltage regulation and reference applications in power supply feedback loops and analog sensing circuits.

For engineers reviewing the DDZ39BSF-7 datasheet, DDZ39BSF-7 pinout, DDZ39BSF-7 application, or DDZ39BSF-7 equivalent, this device is selected for stable low-power voltage clamping, precision biasing, and overvoltage protection where thermal stability, SOD323F footprint compatibility, and AEC-Q200-ready manufacturing are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified zener test current of 5 mA and exhibits a temperature coefficient of approximately +3.5 mV/°C near 36 V, enabling predictable drift compensation in reference designs. Its 250 °C/W junction-to-ambient thermal resistance assumes mounting on FR-4 PCB with 10 mm × 10 mm copper pad.

The device uses a planar epitaxial construction with matte tin–annealed copper alloy leadframe, achieving 0.004 g mass and moisture sensitivity level 1 per J-STD-020. Cathode identification is via molded band marking, consistent with industry-standard polarity orientation for SOD323F packages.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-compact plastic-molded surface-mount package with 0.25–0.35 mm lead width, 0.05–0.26 mm lead thickness, and 2.30–2.70 mm overall height. Cathode terminal identified by molded band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C36LT1G and MMSZ5245B-TP, DDZ39BSF-7 provides tighter voltage tolerance, lower dynamic impedance, higher power rating, and superior thermal performance in the smaller SOD323F footprint-making it optimal for space-constrained, high-accuracy industrial and automotive references.

Availability

DDZ39BSF-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive ECUs, and portable test equipment requiring stable component supply with guaranteed long-term continuity.

Supply support for DDZ39BSF-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, manufacturing, and sales operations across Asia, Europe, and North America.

This device belongs to Diodes' DDZ precision Zener series, engineered for high-stability voltage reference and regulation in automotive, industrial, and computing power systems where tight tolerance and thermal robustness are mandatory.

FAQ

What is the maximum continuous reverse voltage that DDZ39BSF-7 can safely clamp?

The device is rated for continuous operation up to its nominal zener voltage range (35.36–37.19 V) at 5 mA. For transient clamping, it withstands peak reverse voltages up to 40 V per pulse testing conditions defined in DS31987 Rev. 23–2, provided average power remains ≤500 mW and thermal limits are observed.

Does DDZ39BSF-7 meet AEC-Q200 requirements for automotive use?

While DDZ39BSF-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, Diodes specifies AEC-Q200 qualification for select variants only. This part is automotive-capable per process controls and material definitions but requires customer validation for specific AEC-Q200 stress test profiles.

How does the SOD323F package affect thermal performance compared to SOD-123?

SOD323F's smaller footprint (1.25 mm × 1.70 mm vs. SOD-123's 1.8 mm × 2.8 mm) results in higher thermal resistance: 250 °C/W versus ~200 °C/W for typical SOD-123 Zeners. This necessitates careful PCB copper area design-minimum 10 mm × 10 mm pad-to sustain full 500 mW dissipation.

Can DDZ39BSF-7 replace older DDZ39ASF variants in existing designs?

Yes-DDZ39BSF-7 shares identical SOD323F package, pinout, and electrical specifications except for tighter voltage tolerance (±2.6% vs. ±3.2% for ASF grade). No layout or schematic changes are needed; the improved V_Z consistency enhances system accuracy without compromising reliability.