Diodes Incorporated DDZ10CQ-7

Overview

DDZ10CQ-7 from Diodes Incorporated is a precision surface-mount Zener diode with nominal zener voltage 9.70–10.20 V at 20 mA, ±5% tolerance, 8 Ω dynamic impedance at 20 mA, and 0.1 µA maximum reverse leakage at 8.0 V. It operates in SOD123 package, rated for 470 mW power dissipation at 25°C ambient, and is AEC-Q101 qualified for automotive voltage reference and regulation circuits.

For engineers reviewing the DDZ10CQ-7 datasheet, DDZ10CQ-7 pinout, DDZ10CQ-7 application, or DDZ10CQ-7 equivalent, this part serves as a stable, low-noise, temperature-compensated voltage reference in power supply feedback loops, overvoltage protection clamps, and analog sensor biasing - where tight V_Z tolerance and low Z_ZT are critical.

Technical Context

This Zener diode employs silicon planar epitaxial construction to achieve precise breakdown characteristics with minimal voltage drift over temperature. Its 9.70–10.20 V nominal range places it in the mid-voltage zone where temperature coefficient crosses zero near +0.02%/°C (per Fig. 16), minimizing thermal drift in precision references.

The device is optimized for DC voltage regulation and shunt reference use, not transient suppression or high-current clamping. It requires external current limiting and exhibits stable operation under continuous DC bias up to 20 mA, with reverse leakage tightly controlled at ≤0.1 µA @ 8.0 V.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic package with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); moisture sensitivity level 1; RoHS-compliant matte tin finish on Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C10LT1G and MMSZ5240B-TP, DDZ10CQ-7 delivers superior voltage accuracy (±2.5% vs. ±5%), lower dynamic impedance (8 Ω vs. ≥17 Ω), and certified automotive reliability - making it the preferred choice for safety-critical or thermally demanding applications where regulation stability is non-negotiable.

Availability

DDZ10CQ-7 is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC analog modules, medical power supplies, and test equipment calibration circuits requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for DDZ10CQ-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 DDZ series targets precision voltage reference needs in space-constrained, high-stability applications - designed specifically for automotive-grade shunt regulation where AEC-Q101 compliance, tight V_Z tolerance, and low Z_ZT are mandatory.

FAQ

What is the maximum continuous zener current for DDZ10CQ-7?

The device is rated for 20 mA test current (I_ZT) and supports continuous operation up to that level under proper thermal conditions. At 20 mA and 10 V, power dissipation reaches 200 mW - well within its 470 mW ambient-rated limit. Derating is required above +25°C ambient per the published power derating curve (Fig. 1).

Does DDZ10CQ-7 require an external current-limiting resistor?

Yes - like all shunt Zener diodes, DDZ10CQ-7 must be used with a series current-limiting resistor to set the operating point and prevent thermal runaway. The resistor value is calculated using (V_IN − V_Z) / I_Z, where I_Z is chosen between 5 mA and 20 mA depending on regulation stability and power budget requirements.

How does the temperature coefficient affect regulation accuracy in automotive applications?

DDZ10CQ-7 exhibits a temperature coefficient of approximately +0.02%/°C near 10 V (per Fig. 16), resulting in ~±0.25% V_Z shift over −40 to +125°C. This low drift enables stable reference performance in engine bay environments without additional compensation circuitry.

Can DDZ10CQ-7 replace DDZ10BQ-7 in existing designs?

Yes - DDZ10CQ-7 supersedes DDZ10BQ-7 with tighter voltage tolerance (9.70–10.20 V vs. 9.41–9.90 V) and identical SOD123 package, pinout, and AEC-Q101 qualification. No layout or schematic changes are needed; the improved V_Z range enhances system-level accuracy without affecting thermal or electrical compatibility.