Diodes Incorporated DDZ9709Q-7

Overview

DDZ9709Q-7 from Diodes Incorporated is a surface-mount, low-current Zener diode with a nominal zener voltage of 24 V (min 22.8 V, max 25.2 V), rated for 500 mW power dissipation on FR-4 PCB at TL = +75°C, specified at 50 µA test current, and housed in an AEC-Q101 qualified SOD123 package for automotive applications.

For engineers reviewing the DDZ9709Q-7 datasheet, DDZ9709Q-7 pinout, DDZ9709Q-7 application, or DDZ9709Q-7 equivalent, this part serves as a precision voltage reference in low-power bias networks, battery monitoring circuits, and overvoltage protection stages where stable reverse breakdown and minimal leakage (<0.05 µA at 18.2 V) are critical.

Technical Context

This device operates as a two-terminal voltage reference diode, relying on controlled avalanche breakdown in silicon to maintain a stable reverse voltage across its cathode–anode terminals. Its low 50 µA test current enables operation in ultra-low-power systems, while its ±5% zener voltage tolerance and temperature coefficient of ~0.06%/°C (per Fig. 14) support predictable regulation over -65°C to +150°C.

The SOD123 package provides standardized thermal resistance (R_θJA = 340°C/W, R_θJL = 150°C/W) and is optimized for automated placement. With <0.05 µA reverse leakage at VR = 18.2 V and VF = 0.9 V at IF = 10 mA, it balances low standby loss with reliable forward conduction during transient clamping.

Key Specifications

Pinout & Package

SOD123 package: molded plastic case (UL 94V-0), cathode band marking, matte tin–annealed terminals over Alloy 42 leadframe, weight ≈ 0.01 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C24LT1G and MMSZ5245B-TP, DDZ9709Q-7 uniquely delivers AEC-Q101 qualification, 500 mW power handling, and guaranteed ≤0.05 µA leakage at 18.2 V - making it the sole option for safety-critical, thermally demanding automotive voltage reference roles.

Availability

DDZ9709Q-7 is available at Aetrix Electronics and suitable for automotive battery management, CAN bus protection, low-power sensor biasing, and EEPROM write-protection circuits requiring stable component supply across long product lifecycles.

Supply support for DDZ9709Q-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 consumer markets.

The DDZ9xxxQ series belongs to Diodes' AEC-Q101 qualified Zener diode product line, engineered specifically for automotive voltage reference and clamping applications where robustness, low leakage, and process traceability are mandatory.

FAQ

What is the maximum reverse voltage (VR) at which DDZ9709Q-7 guarantees ≤0.05 µA leakage?

Per the Electrical Characteristics table, DDZ9709Q-7 guarantees IR ≤ 0.05 µA at VR = 18.2 V. This value is fixed per device type and reflects the voltage level below the zener knee where leakage remains tightly bounded - critical for low-power sleep-mode design.

Does DDZ9709Q-7 require a series current-limiting resistor in all applications?

Yes - like all Zener diodes, DDZ9709Q-7 must be used with a series resistor to limit current during reverse breakdown. The resistor value is calculated using (V_IN − V_Z) / I_Z, where I_Z is selected between 50 µA and the maximum allowable current defined by power derating curves.

Can DDZ9709Q-7 be used in parallel to increase power handling?

No - Zener diodes should never be paralleled due to mismatched breakdown voltages causing current hogging and thermal instability. For higher power, select a single device with appropriate rating (e.g., DDZ9713Q-7 at 30 V/500 mW) or implement active regulation.

Is the SOD123 package of DDZ9709Q-7 compatible with reflow profiles for lead-free soldering?

Yes - the matte tin–annealed terminals meet MIL-STD-202 Method 208 solderability requirements and are qualified for standard Pb-free reflow profiles (peak 260°C, 60 sec max), including J-STD-020 Level 1 moisture sensitivity handling.