Diodes Incorporated DDZ20BSF-7

Overview

DDZ20BSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 19.1 V (min 18.63 V, max 19.59 V) at 10 mA test current, 50 Ω maximum zener impedance, and ±0.07 µA reverse leakage at 17.7 V. It delivers tight voltage tolerance for voltage reference and regulation in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages.

For engineers reviewing the DDZ20BSF-7 datasheet, DDZ20BSF-7 pinout, DDZ20BSF-7 application, or DDZ20BSF-7 equivalent, this device is selected for stable low-power voltage clamping, precision biasing in sensor interfaces, and temperature-compensated reference generation where SOD323F footprint and automotive-grade reliability are required.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified zener test current of 10 mA and exhibits a typical temperature coefficient near +10.5 mV/°C at 20 V, enabling predictable drift compensation in mid-voltage reference designs. Its thermal resistance (250 °C/W) and FR-4 PCB derating curve support continuous operation up to +150 °C ambient when mounted on standard 10 mm × 10 mm copper pads.

The device uses a planar epitaxial construction with cathode band marking, matte tin–annealed copper alloy leadframe, and halogen/antimony-free green molding compound compliant with RoHS 3 and AEC-Q200 readiness. Moisture sensitivity level is rated at Level 1 per J-STD-020.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-compact plastic surface-mount package with molded green compound (UL 94V-0), cathode band marking, and matte tin–annealed copper alloy terminals. Dimensions: 1.25 mm × 1.70 mm × 0.75 mm (L × W × H), weight ≈ 0.004 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C20LT1G and MMSZ5248B-TP, DDZ20BSF-7 offers superior voltage accuracy (±2.5% vs. ±5%), lower zener impedance (50 Ω vs. ≥27 Ω), and optimized SOD323F footprint for high-density layouts-making it preferred for automotive-grade and precision analog applications.

Availability

DDZ20BSF-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor modules, precision instrumentation, and medical device voltage references requiring stable component supply across long production lifecycles.

Supply support for DDZ20BSF-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, specializing in high-reliability components for automotive, industrial, and computing markets.

The DDZ series targets precision voltage reference and regulation applications, emphasizing tight Zener tolerance, low impedance, and robust environmental compliance for mission-critical analog subsystems.

FAQ

What is the maximum continuous reverse voltage that DDZ20BSF-7 can safely clamp?

The device is rated for continuous operation at its nominal zener voltage range (18.63–19.59 V) with 10 mA test current. It can sustain brief transients up to its absolute maximum rating of 20.72 V (DDZ20DSF variant), but sustained clamping above 19.59 V risks exceeding 500 mW dissipation unless thermally derated per Figure 1. For reliable long-term operation, maintain average power below 350 mW at +85 °C ambient.

Does DDZ20BSF-7 meet AEC-Q200 stress testing requirements?

DDZ20BSF-7 is manufactured in IATF 16949 certified facilities and designed to meet AEC-Q200 requirements for passive components. While not pre-qualified as a standalone AEC-Q200 part, Diodes confirms full PPAP capability and change control support for automotive customers-qualification testing must be performed at system level per customer-specific requirements.

How does the SOD323F package affect solder joint reliability compared to SOD-123?

The SOD323F's smaller 0.40 mm pin pitch and 1.25 mm × 1.70 mm body require tighter stencil aperture control and optimized reflow profiles, but its matte tin–annealed leadframe and J-STD-020 Level 1 rating ensure excellent wetting and intermetallic formation. Unlike SOD-123, SOD323F's symmetrical geometry reduces tombstoning risk in automated placement.

Can DDZ20BSF-7 replace DDZ20ASF in an existing design?

Yes-DDZ20BSF-7 and DDZ20ASF share identical SOD323F package, pinout, and thermal characteristics, differing only in zener voltage range (DDZ20ASF: 18.05–18.96 V; DDZ20BSF-7: 18.63–19.59 V). The B-grade offers tighter centering around 19.1 V, improving regulation accuracy in new designs without layout changes.