Diodes Incorporated DDZ9711S-7

Overview

DDZ9711S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal Zener voltage 27 V, ±5% tolerance (25.65–28.35 V), 200 mW power dissipation, and ultra-low reverse leakage current of 0.05 μA at 20.4 V. It uses SOD-323 package and serves as a stable voltage reference in low-power analog sensing and power supply feedback loops.

For engineers reviewing the DDZ9711S-7 datasheet, DDZ9711S-7 pinout, DDZ9711S-7 application, or DDZ9711S-7 equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient (≈+0.08 %/°C), thermal resistance (625 °C/W), and RoHS-compliant "Green" packaging for automated assembly.

Technical Context

This device operates in reverse-biased breakdown mode with sharp knee characteristics and tightly controlled V_Z distribution. Its 27 V nominal rating places it in the medium-voltage Zener range where temperature coefficient transitions from negative to positive, confirmed by Fig. 19 showing +0.08 %/°C at 27 V.

Designed for precision regulation in space-constrained PCBs, it delivers stable reference performance under low-current conditions (I_ZT = 50 μA) and maintains <0.1 μA leakage up to 20.4 V - critical for battery-powered sensor biasing and ADC reference stabilization.

Key Specifications

Pinout & Package

SOD-323 package: 2-terminal surface-mount case with cathode band marking; molded green compound (UL 94V-0), matte tin-plated Alloy 42 leads, polarity indicated by single black band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27LT1G and MMSZ4683T1G, DDZ9711S-7 offers the lowest leakage (0.05 μA) and AEC-Q101 qualification - making it optimal for battery-critical and automotive-grade reference designs where long-term stability and minimal standby current dominate selection.

Availability

DDZ9711S-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, portable medical diagnostics, and automotive cabin control systems requiring stable component supply across multi-year production cycles.

Supply support for DDZ9711S-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 operations across Asia and the Americas.

The DDZ9xxxS series belongs to Diodes' precision Zener diode product line, engineered specifically for high-accuracy voltage reference and clamping in space-constrained, low-power applications including automotive, industrial, and portable electronics.

FAQ

What is the maximum allowable reverse voltage before breakdown for DDZ9711S-7?

The rated Zener voltage is 27 V nominal with ±5% tolerance (25.65–28.35 V). Breakdown begins at the minimum specified V_Z of 25.65 V under test condition I_ZT = 50 μA. Operation below 20.4 V (the VR value in datasheet table) ensures <0.05 μA leakage - no hard "maximum non-breakdown" voltage is defined, as Zener action is gradual.

Does DDZ9711S-7 require a series current-limiting resistor in all applications?

Yes - like all shunt Zener regulators, DDZ9711S-7 must be used with an external series resistor to limit current through the diode. The resistor value is calculated using (V_IN − V_Z)/I_Z, where I_Z is chosen between 50 μA (min spec point) and 5 mA (to stay within 200 mW limit), depending on regulation stability and load current requirements.

Is DDZ9711S-7 qualified for automotive use?

Yes - DDZ9711S-7 is explicitly qualified to AEC-Q101 standards for high-reliability automotive applications, as noted in the datasheet footnote 5 for DDZ9705S and confirmed by inclusion in the DDZ9689S–DDZ9717S family qualified per that standard. This covers stress testing for temperature cycling, humidity, and mechanical shock.

How does the temperature coefficient affect voltage stability over temperature?

At 27 V, DDZ9711S-7 exhibits a positive temperature coefficient of approximately +0.08 %/°C (per Fig. 19). This means its Zener voltage increases by ~21.6 mV per °C rise - a 10°C ambient shift causes ~0.216 V drift. For high-stability references, this must be compensated via circuit design or selected alongside complementary TC components.