Diodes Incorporated DDZ6V8CQ-7

Overview

DDZ6V8CQ-7 from Diodes Incorporated is a precision Zener diode in SOD123 package, designed for voltage regulation and reference applications with tight 3% zener voltage tolerance (6.66 V to 7.01 V at 20 mA), low dynamic impedance (5 Ω at 20 mA), and AEC-Q101 qualification for automotive use. It operates across –65 °C to +150 °C, supports 470 mW power dissipation at 25 °C ambient, and features matte tin–annealed Alloy 42 terminals for reliable solderability.

For engineers reviewing the DDZ6V8CQ-7 datasheet, DDZ6V8CQ-7 pinout, DDZ6V8CQ-7 application, or DDZ6V8CQ-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (425 °C/W on minimal pad layout), reverse leakage (≤0.5 µA at 5.0 V), cathode-band polarity marking, and automotive-grade change control compliance.

Technical Context

This device functions as a two-terminal shunt voltage regulator, maintaining stable output voltage by conducting reverse current above its specified breakdown threshold. Its low zener impedance (5 Ω) ensures minimal voltage variation under load changes, while the 0.05% /°C temperature coefficient near 6.8 V enables stable reference performance over temperature.

The SOD123 package provides surface-mount compatibility with JEDEC-standard footprint, moisture sensitivity level 1, and UL 94V-0 flammability rating. Terminal finish meets MIL-STD-202 Method 208 for solderability, and the cathode band identifies polarity for correct PCB orientation during automated assembly.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 1.55 mm (D) × 2.65 mm (E) × 3.65 mm (H_e); weight ≈ 0.01 g; UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C6V8-7-F and MMSZ4689T1G, DDZ6V8CQ-7 delivers superior voltage accuracy, lower impedance, and certified automotive reliability-making it the only choice for safety-critical or high-precision reference nodes where long-term stability and regulatory compliance are mandatory.

Availability

DDZ6V8CQ-7 is available at Aetrix Electronics and suitable for automotive sensor systems, industrial PLC analog inputs, medical battery monitoring, and telecom DC-DC feedback networks requiring stable component supply with guaranteed long-term continuity.

Supply support for DDZ6V8CQ-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, manufacturing, and sales operations across Asia, Europe, and the Americas.

The DDZ series targets precision voltage reference and regulation in automotive and industrial applications, emphasizing tight tolerance, low impedance, and AEC-Q101 compliance for mission-critical subsystems.

FAQ

What is the maximum steady-state power dissipation for DDZ6V8CQ-7 at 75 °C ambient?

At T_L = +75 °C, the device supports 500 mW power dissipation per the datasheet's note 6. This rating assumes a controlled lead temperature condition, not ambient; for board-level design, use the 470 mW rating at T_A = +25 °C and apply the derating curve (Figure 1) to determine safe operating power at elevated ambient temperatures.

Is DDZ6V8CQ-7 compatible with lead-free reflow profiles?

Yes. The device uses matte tin–annealed terminals over Alloy 42 leadframe and is qualified per J-STD-020 Level 1 moisture sensitivity. It withstands peak reflow temperatures up to 260 °C and complies with IPC/JEDEC J-STD-020D.1, making it fully compatible with standard Pb-free SAC305 reflow profiles.

How does the cathode band marking align with PCB silkscreen polarity indicators?

The cathode band corresponds to the "K" end of the SOD123 outline and must align with the PCB's designated cathode silkscreen marker (typically a bar or "K"). Misalignment causes forward conduction instead of Zener regulation, resulting in excessive current draw and potential failure. Diodes' recommended pad layout (X = 0.900 mm, Y = 0.950 mm) ensures mechanical registration for automated optical inspection.

Can DDZ6V8CQ-7 replace DDZ6V8BQ-7 in an existing design?

Yes, with improved performance: DDZ6V8CQ-7 offers tighter voltage tolerance (±1.7% vs. ±2.5% for DDZ6V8BQ-7) and identical package, pinout, and thermal specs. No layout or firmware changes are needed. The "C" grade supersedes "B" for applications demanding higher reference accuracy, especially in closed-loop feedback or calibration-critical paths.