Diodes Incorporated DDZ9V1BSF-7

Overview

DDZ9V1BSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 8.57–9.01 V at 20 mA test current, 30 Ω maximum zener impedance at 1 kHz, and 7.5 µA maximum reverse leakage at 8.14 V. It delivers tight voltage tolerance (±2.5% typical), low thermal resistance (250 °C/W), and operates across –65 to +150 °C for voltage reference and regulation in power supply feedback loops.

For engineers reviewing the DDZ9V1BSF-7 datasheet, DDZ9V1BSF-7 pinout, DDZ9V1BSF-7 application, or DDZ9V1BSF-7 equivalent, this part supports precision analog sensing, overvoltage clamping in automotive ECUs, and stable biasing in industrial sensor signal conditioning-where low-impedance, temperature-stable voltage references are required.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z tolerance and low dynamic impedance (Z_ZT ≤ 30 Ω), enabling accurate voltage regulation under varying load and temperature conditions. Its SOD323F package provides minimal thermal resistance (R_θJA = 250 °C/W on FR-4) and supports high-density automated assembly.

The device exhibits a positive temperature coefficient near 9 V (≈ +6.5 mV/°C per Fig. 3), minimizing drift in mid-range Zener voltages. Reverse leakage remains ≤7.5 µA at VR = 8.14 V, ensuring low quiescent current in standby-sensitive applications like battery-backed monitoring circuits.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-compact plastic-molded case (1.25 mm × 1.70 mm × 0.90 mm max), UL 94V-0 rated, matte tin-plated copper alloy leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C9V1,115 and MMSZ5240B-TP, DDZ9V1BSF-7 offers superior voltage accuracy and lower dynamic impedance in the same compact SOD323F form factor-enabling higher-performance regulation without layout redesign or thermal compromise.

Availability

DDZ9V1BSF-7 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor excitation, and switching power supply feedback requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned manufacturing traceability.

Supply support for DDZ9V1BSF-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 facilities across Asia and the Americas.

This device belongs to the DDZxx(x)SF precision Zener series, engineered specifically for high-accuracy voltage reference and clamping in automotive, industrial, and computing power systems where tight tolerance and thermal stability are critical.

FAQ

What is the maximum continuous power dissipation for DDZ9V1BSF-7?

The DDZ9V1BSF-7 is rated for 500 mW maximum power dissipation when mounted on a standard FR-4 PCB with a 10 mm × 10 mm copper pad. Derating begins above +25 °C ambient per the published power derating curve (Fig. 1), reaching zero dissipation at +150 °C ambient.

Does DDZ9V1BSF-7 meet automotive qualification standards?

DDZ9V1BSF-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, it is designed to meet automotive-grade reliability requirements-including operating temperature (–65 to +150 °C), robustness against thermal cycling, and halogen-free composition-and is commonly used in non-safety-critical ECU subsystems.

How is the cathode identified on the SOD323F package?

The cathode is marked by a visible dark band on the top surface of the SOD323F package, aligned with one end of the rectangular body. In top-view orientation, the banded end corresponds to the cathode terminal; the opposite end is the anode. This matches the "Cathode Band" terminal connection specified in the mechanical data section.

Can DDZ9V1BSF-7 be used in place of a 9.1 V Zener with looser tolerance?

Yes-DDZ9V1BSF-7's tighter 8.57–9.01 V range (±2.5%) makes it a direct upgrade for legacy 9.1 V Zeners with ±5% tolerance (e.g., BZX84-C9V1). No circuit changes are needed, but expect improved regulation accuracy, lower output ripple, and better temperature stability due to its lower Z_ZT and optimized TC profile.