Diodes Incorporated DDZX6V8C-7

Overview

DDZX6V8C-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 300 mW power dissipation on FR-4 PCB, with nominal zener voltage 6.66–7.01 V at 20 mA test current, zener impedance ≤5 Ω at 1 kHz, and reverse leakage ≤0.5 μA at 5.0 V. It serves as a stable voltage reference in low-power analog monitoring circuits.

For engineers reviewing the DDZX6V8C-7 datasheet, DDZX6V8C-7 pinout, DDZX6V8C-7 application, or DDZX6V8C-7 equivalent, key selection factors include tight V_Z tolerance (±2.5%), low dynamic impedance, AEC-Q101 qualification, and compatibility with automated SMT assembly on standard FR-4 layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with sharp knee characteristics, enabling precise voltage regulation in feedback paths and reference nodes. Its thermal resistance of 417 °C/W (junction-to-ambient, FR-4) and derating curve support operation up to +150 °C ambient when power is reduced per Figure 1.

The device exhibits low temperature coefficient (≈+0.04 %/°C near 6.8 V, per Fig. 16), minimal capacitance (<2 pF typical at 1 MHz, inferred from Fig. 10), and negligible forward voltage (0.9 V @ 10 mA), making it suitable for high-stability, low-noise biasing where parasitic effects must be minimized.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal surface-mount plastic package, 2.4 mm × 1.3 mm footprint, 1.1 mm height, matte tin-plated Alloy 42 leadframe, RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C6V8 and MMSZ4687, DDZX6V8C-7 delivers superior voltage accuracy (±2.5% vs. ±5%), lower dynamic impedance (5 Ω vs. ≥10 Ω), and automotive-grade reliability-making it the optimal choice for safety-critical or high-precision reference nodes where long-term stability and qualification matter.

Availability

DDZX6V8C-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, and programmable power supply feedback requiring stable component supply, consistent parametric performance, and AEC-Q101 traceability.

Supply support for DDZX6V8C-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 North America.

This part belongs to the DDZX series of precision Zener diodes-designed specifically for high-accuracy voltage reference and regulation in space-constrained, high-reliability applications including automotive, industrial, and medical electronics.

FAQ

What is the maximum continuous reverse current (I_Z) this Zener can handle without exceeding its power rating?

At 25 °C ambient and mounted on FR-4 PCB, DDZX6V8C-7 supports up to 44 mA continuous reverse current (300 mW ÷ 6.8 V ≈ 44 mA) before reaching its 300 mW power limit. Derating applies above 25 °C per Figure 1; at 85 °C, max I_Z drops to ~25 mA.

Is the SOT23 pinout compatible with standard pick-and-place equipment using JEDEC-standard nozzle tooling?

Yes-the SOT23 package uses standard JEDEC MO-215 outline with 0.95 mm pitch between pins 1 and 2, and 1.9 mm between pins 1 and 3. The matte tin finish and coplanarity <0.1 mm meet IPC-J-STD-020 Level 1 moisture sensitivity requirements for automated placement.

Does this Zener diode require external series resistance in typical reference applications?

Yes-a current-limiting resistor is mandatory to set I_Z within 1–20 mA for stable regulation. For example, with 12 V supply and 6.8 V V_Z, a 270 Ω resistor delivers ~19.3 mA, keeping Z_ZT low and temperature coefficient minimal per datasheet curves.

How does the temperature coefficient behave near 6.8 V, and what impact does it have on reference stability?

Per Figure 16, DDZX6V8C-7 exhibits +0.04 %/°C TC near 6.8 V-translating to ~2.7 mV/°C drift. Over a 50 °C range (−40 to +105 °C), total V_Z shift is ~135 mV, which is acceptable for 1% system accuracy but requires compensation in sub-0.1% designs.