Diodes Incorporated DDZ9702Q-7

Overview

DDZ9702Q-7 from Diodes Incorporated is a surface-mount, low-current Zener diode with a nominal zener voltage of 15 V (min 14.25 V, max 15.75 V), rated for 500 mW power dissipation at TL = +75°C on FR-4 PCB, and specified at 50 µA test current - ideal for low-bias, battery-powered voltage reference and regulation in portable instrumentation and sensor signal conditioning circuits.

For engineers reviewing the DDZ9702Q-7 datasheet, DDZ9702Q-7 pinout, DDZ9702Q-7 application, or DDZ9702Q-7 equivalent, key selection criteria include its SOD123 package footprint, AEC-Q101 qualification for automotive use, low reverse leakage (≤0.05 µA at VR = 11.4 V), and temperature coefficient behavior near zero crossing (~+0.04 %/°C at 15 V) for stable reference performance across industrial temperature ranges.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage under low-current bias conditions. Its 50 µA test current enables operation in ultra-low-power systems where quiescent current must remain below 100 µA, and its 150 °C/W junction-to-lead thermal resistance supports reliable thermal coupling to PCB copper when used in compact, thermally constrained layouts.

The device exhibits a positive temperature coefficient of approximately +0.04 %/°C at 15 V, placing it near the zero-TC crossover region for Zeners between 10–20 V - enabling improved long-term stability in unregulated supply rails and analog front-end references without external compensation.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case (UL 94V-0), 0.01 g weight, cathode band marking, matte tin annealed terminals solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C15LT1G and MMSZ5245B-TP, DDZ9702Q-7 delivers superior low-current stability, automotive qualification, and tighter leakage control - making it the optimal choice for safety-critical, battery-sensitive, or thermally constrained reference designs.

Availability

DDZ9702Q-7 is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical devices, industrial PLC I/O modules, and smart metering systems requiring stable component supply with full traceability and long-lifecycle support.

Supply support for DDZ9702Q-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 computing markets.

The DDZ9xxxQ series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in automotive subsystems and harsh-environment electronics.

FAQ

What is the maximum reverse voltage (V_R) at which DDZ9702Q-7 guarantees ≤0.05 µA leakage?

DDZ9702Q-7 guarantees reverse leakage current ≤0.05 µA at V_R = 11.4 V, as specified in the Electrical Characteristics table. This value is derived from the 76% rule (0.76 × V_Z nominal = 0.76 × 15 V = 11.4 V) and reflects the device's low-leakage performance in sub-breakdown bias conditions.

Does DDZ9702Q-7 require heatsinking in typical SOD123 PCB layouts?

No additional heatsink is required. At 500 mW dissipation, the device relies on thermal conduction through the SOD123 leads and recommended FR-4 pad layout (per Diodes' Suggested Pad Layout document). Junction temperature remains within limits when board-level thermal resistance meets R_θJA = 340 °C/W specification.

How does the temperature coefficient of DDZ9702Q-7 compare to lower-voltage Zeners in the same family?

DDZ9702Q-7 exhibits a +0.04 %/°C temperature coefficient - significantly lower than 3.3 V or 5.1 V variants (which show −0.06 to −0.02 %/°C) and near the zero-TC crossover point for silicon Zeners. This yields superior long-term reference stability across −40 °C to +125 °C without external compensation.

Can DDZ9702Q-7 be used in series or parallel configurations for higher voltage or current capability?

Series connection is feasible for higher reference voltages (e.g., two 15 V units for ~30 V), but requires matched units to avoid current imbalance. Parallel use is not recommended due to V_Z tolerance spread (±5%) and unequal current sharing; discrete current-limiting resistors would be mandatory for any parallel configuration.