Diodes Incorporated DDZX8V2C-7

Overview

DDZX8V2C-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 8.2 V (min 8.03 V, max 8.45 V at I_ZT = 20 mA), zener impedance 8 Ω at 20 mA and 120 Ω at 0.5 mA, and reverse leakage ≤0.5 μA at 6.5 V. It serves as a stable voltage reference in low-power analog monitoring circuits.

For engineers reviewing the DDZX8V2C-7 datasheet, DDZX8V2C-7 pinout, DDZX8V2C-7 application, or DDZX8V2C-7 equivalent, this part is selected for precision biasing, overvoltage clamping, and feedback regulation where tight V_Z tolerance (±1.3%), low dynamic impedance, and AEC-Q101 qualification are required.

Technical Context

This device operates in reverse breakdown mode with sharp knee characteristics, enabling accurate voltage regulation across load and temperature variations. Its thermal resistance of 417 °C/W (junction-to-ambient, FR-4) defines derating behavior above +25 °C ambient.

The zener voltage exhibits a positive temperature coefficient near 0.05 %/°C at 8.2 V, confirmed by Figure 16–19 in DS30408 Rev. 13-2. Total capacitance is <2 pF at V_R = 2 V (f = 1 MHz), supporting high-frequency stability in feedback paths.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal plastic surface-mount package with matte tin annealed terminals, UL 94V-0 rating, and 0.008 g mass. Moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C8V2 and MMSZ4689, DDZX8V2C-7 delivers superior V_Z accuracy (±1.3% vs. ±5%), lower dynamic impedance (8 Ω vs. ≥10 Ω), and built-in AEC-Q101 compliance-making it the only choice for safety-critical or temperature-stable reference designs.

Availability

DDZX8V2C-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive cabin control modules, and medical portable infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DDZX8V2C-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 since 1960.

DDZX8V2C-7 belongs to the DDZX series of precision Zener diodes designed specifically for stable voltage reference and overvoltage protection in space-constrained, high-reliability applications.

FAQ

What is the maximum recommended continuous Zener current for DDZX8V2C-7?

The datasheet specifies I_ZT = 20 mA as the test condition for V_Z measurement, and maximum power dissipation is 300 mW. At 8.2 V, this corresponds to a theoretical absolute maximum I_Z of ~36.6 mA. However, sustained operation above 25 mA is discouraged due to thermal derating - design should limit average current to ≤20 mA with adequate PCB copper area for heat spreading.

Does DDZX8V2C-7 require an external current-limiting resistor in shunt regulator configurations?

Yes - like all shunt Zeners, DDZX8V2C-7 must be used with a series current-limiting resistor to set operating point and prevent thermal runaway. The resistor value is calculated as R = (V_IN − V_Z) / I_Z, where I_Z is chosen between 5 mA and 20 mA to balance regulation accuracy and power efficiency.

Is the SOT23 package of DDZX8V2C-7 compatible with standard reflow profiles for lead-free soldering?

Yes - the matte tin annealed terminals meet MIL-STD-202 Method 208 solderability requirements, and the device is qualified for JEDEC J-STD-020 moisture sensitivity level 1. Standard IPC/JEDEC J-STD-020D reflow profiles (peak 260 °C, 60 s above 217 °C) are fully supported without preconditioning.

How does the temperature coefficient of DDZX8V2C-7 affect its performance at −40 °C and +125 °C?

Per Figure 16–19 in DS30408, DDZX8V2C-7 has a typical TC of +0.05 %/°C near 8.2 V. From +25 °C to +125 °C (ΔT = +100 °C), V_Z increases by ~0.41 V (5%); from +25 °C to −40 °C (ΔT = −65 °C), V_Z decreases by ~0.27 V (3.3%). This drift is predictable and can be compensated in closed-loop systems.