Diodes Incorporated DDZ3V3BSF-7

Overview

DDZ3V3BSF-7 from Diodes Incorporated is a precision 3.3 V Zener diode in SOD323F package, designed for voltage regulation and reference applications with ±3% tolerance (3.32–3.53 V at 20 mA), 130 Ω dynamic impedance, and 20 µA reverse leakage at 1 V. It delivers stable 500 mW power dissipation on FR-4 PCBs and supports automotive-grade assembly via RoHS-compliant, halogen-free construction.

For engineers reviewing the DDZ3V3BSF-7 datasheet, DDZ3V3BSF-7 pinout, DDZ3V3BSF-7 application, or DDZ3V3BSF-7 equivalent, this device is selected for low-voltage rail clamping, analog sensor reference stabilization, and power-supply feedback loop precision-where tight V_Z tolerance, low thermal resistance (250 °C/W), and SMT compatibility are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 3.32–3.53 V at test current I_ZT = 20 mA. Its temperature coefficient is near-zero (~0 mV/°C) in the 3.3 V range, minimizing drift across -65 to +150 °C ambient operation.

The device uses a planar epitaxial silicon junction structure optimized for low noise and stable regulation under pulsed and DC conditions. Its SOD323F package features matte tin–annealed copper alloy leads, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 molded plastic housing.

Key Specifications

Pinout & Package

SOD323F is a two-terminal surface-mount package with cathode identified by a visible band. The leadframe uses matte tin–annealed copper alloy, solderable per MIL-STD-202 Method 208. Weight is 0.004 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B3V3 and MMSZ5226B-TP, DDZ3V3BSF-7 offers tighter voltage tolerance and lower leakage than the Nexperia part, while providing superior thermal performance and smaller footprint versus the MCC device-making it optimal for space-constrained, low-drift 3.3 V reference designs.

Availability

DDZ3V3BSF-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C protection circuits, microcontroller reset networks, and low-power IoT regulator feedback requiring stable component supply across long-lifecycle programs.

Supply support for DDZ3V3BSF-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, industry-qualified components for automotive, industrial, and computing markets.

This device belongs to the DDZxx(x)SF precision Zener series, engineered specifically for voltage reference and regulation in space-constrained, thermally demanding applications where tight tolerance and environmental compliance are mandatory.

FAQ

What is the maximum continuous reverse current the DDZ3V3BSF-7 can sustain without degradation?

The device is rated for 20 mA zener test current (I_ZT) and 500 mW power dissipation. At 3.3 V, this corresponds to ~151 mA absolute maximum continuous reverse current before exceeding P_D. However, sustained operation above 20 mA increases junction temperature and accelerates parameter drift; design practice limits continuous current to ≤10 mA for long-term stability.

Does the DDZ3V3BSF-7 meet AEC-Q101 qualification for automotive use?

No-this specific part is not AEC-Q101 qualified. While manufactured in IATF 16949-certified facilities and compliant with RoHS/halogen-free standards, Diodes states that AEC-Q101 qualification requires explicit PPAP submission and change control; users must contact Diodes directly to request automotive-qualified variants such as DDZ3V3BSFQ-7 (if available).

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

SOD323F has a smaller 2.5 mm × 1.7 mm footprint and thinner profile than SOD-123, resulting in higher thermal resistance (250 °C/W vs. ~350 °C/W for SOD-123 on identical FR-4). However, its optimized leadframe plating and mold compound improve heat transfer efficiency per unit area, enabling full 500 mW dissipation within its size constraints without thermal derating penalties typical of larger packages.

Can DDZ3V3BSF-7 be used in series or parallel configurations for higher voltage or current capability?

Series connection is viable for higher reference voltages (e.g., two units yield ~6.6 V), but mismatched tolerances and temperature coefficients cause stacking errors. Parallel use is strongly discouraged-minor V_Z differences cause current hogging, leading to thermal runaway and premature failure. For higher current, select a single higher-power Zener or use an active shunt regulator.