Diodes Incorporated DDZ4V7BSF-7

Overview

DDZ4V7BSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 4.68 V (max) at 20 mA test current, ±2.5% tolerance (4.55–4.80 V), 130 Ω dynamic impedance, and 10 µA reverse leakage at 3.64 V. It serves as a stable voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail monitoring circuits on FR-4 PCBs.

For engineers reviewing the DDZ4V7BSF-7 datasheet, DDZ4V7BSF-7 pinout, DDZ4V7BSF-7 application, or DDZ4V7BSF-7 equivalent, key selection criteria include its tight V_Z tolerance, SOD323F package compatibility with automated assembly, thermal resistance of 250 °C/W, and suitability for automotive-grade designs when qualified per AEC-Q101.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage under controlled current conditions. Its 20 mA zener test current ensures predictable regulation across temperature, while the 130 Ω zener impedance reflects low AC voltage variation during small-signal perturbations.

The device exhibits a negative temperature coefficient near 4.7 V (≈−2 mV/°C per Fig. 3), enabling predictable drift compensation in reference circuits. Its 500 mW power rating is derated linearly above +25°C ambient per the published curve (Fig. 1), reaching zero dissipation at +150°C.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-small plastic molded case (2.50 mm × 1.70 mm × 1.25 mm), moisture sensitivity level 1, matte tin-plated copper alloy leadframe, cathode identified by band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C4V7LT1G and MMSZ4704T1G, DDZ4V7BSF-7 delivers tighter voltage control (±2.5% vs. ±5%), lower thermal resistance (250 vs. ≥300 °C/W), and superior long-term stability-making it preferred for precision analog interfaces and automotive-qualified systems.

Availability

DDZ4V7BSF-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and medical diagnostic equipment requiring stable component supply with traceable sourcing and lifecycle continuity.

Supply support for DDZ4V7BSF-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' DDZxxBSF precision Zener series, engineered specifically for high-stability voltage reference and protection in space-constrained, thermally demanding applications such as automotive ECUs and portable instrumentation.

FAQ

What is the maximum continuous power dissipation for DDZ4V7BSF-7 on a standard FR-4 PCB?

The DDZ4V7BSF-7 is rated for 500 mW maximum power dissipation when mounted on an FR-4 PCB with a 10 mm × 10 mm copper pad and board dimensions of 35 mm × 25 mm. This rating assumes still-air conditions and drops linearly above +25°C ambient per the published derating curve (Fig. 1), reaching zero at +150°C.

How does the zener voltage tolerance affect circuit accuracy in a 4.7 V reference application?

With a guaranteed V_Z range of 4.55–4.80 V at 20 mA, the ±2.5% tolerance directly bounds absolute reference error. In a 12-bit ADC system with 5 V full scale, this introduces up to ±12.5 LSB offset error-significantly tighter than ±5% alternatives, enabling single-point calibration instead of multi-point trimming.

Can DDZ4V7BSF-7 be used in automotive applications requiring AEC-Q101 qualification?

Yes-while the base DDZ4V7BSF-7 part is not automatically AEC-Q101 qualified, Diodes offers automotive-grade variants (e.g., DDZ4V7BSF-7Q) manufactured in IATF 16949-certified facilities with PPAP documentation. Customers must specify the "Q" suffix and contact Diodes or Aetrix for qualified part numbers and change-control documentation.

What is the significance of the "KL" marking code on DDZ4V7BSF-7 top-side labeling?

The "KL" marking identifies the specific Zener voltage bin (4.55–4.80 V) and process lot within the DDZxxBSF family. It corresponds directly to the electrical characteristics table on page 2 of DS31987 Rev. 23–2 and enables traceability to test data, ensuring consistent performance across production batches.