Diodes Incorporated DDZX5V6B-7

Overview

DDZX5V6B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 5.6 V, ±2.5% tolerance (5.45–5.73 V), 300 mW power dissipation on FR-4 PCB, and low zener impedance of 11 Ω at 20 mA test current. It serves as a stable voltage reference or overvoltage clamp in low-power analog and mixed-signal circuits.

For engineers reviewing the DDZX5V6B-7 datasheet, DDZX5V6B-7 pinout, DDZX5V6B-7 application, or DDZX5V6B-7 equivalent, this part is selected for precision voltage regulation in space-constrained automotive and industrial control modules where tight V_Z tolerance, low leakage (<0.5 µA at 2.5 V), and AEC-Q101 qualification are required.

Technical Context

This Zener diode operates in reverse breakdown mode with sharp knee characteristics and exhibits temperature coefficient behavior typical of mid-voltage Zeners (~0.03–0.06 %/°C). Its 11 Ω dynamic impedance at I_ZT = 20 mA ensures minimal output voltage variation under load changes.

The device uses an alloy-42 leadframe with matte tin annealing, qualified to AEC-Q101, and is rated for operation from –65 °C to +150 °C. Thermal resistance R_θJA is 417 °C/W on standard FR-4 layout, defining its derating envelope above 25 °C ambient.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal plastic surface-mount package with 0.915 mm body width, 2.40 mm length, and 0.40 mm thickness; 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-C5V6 and MMSZ5232BS, DDZX5V6B-7 delivers tighter voltage accuracy, lower dynamic impedance, and automotive-grade reliability-making it optimal for safety-critical voltage references where long-term stability and qualification matter.

Availability

DDZX5V6B-7 is available at Aetrix Electronics and suitable for automotive cabin control modules, industrial sensor signal conditioning circuits, and medical portable diagnostic devices requiring stable component supply with guaranteed long-term continuity.

Supply support for DDZX5V6B-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, engineered specifically for high-reliability voltage reference and clamping applications in automotive, industrial, and medical electronics where tight tolerance and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum continuous zener current for DDZX5V6B-7 at 25°C ambient?

The device supports up to 53.6 mA continuous zener current at 25°C ambient, calculated from P_D = 300 mW and V_Z ≈ 5.6 V (I_Z(max) = P_D/V_Z). Derating begins above 25°C per the 417 °C/W thermal resistance curve shown in Figure 1 of the datasheet.

Is DDZX5V6B-7 suitable for bidirectional ESD protection?

No - DDZX5V6B-7 is a unidirectional Zener diode optimized for reverse-bias regulation. It conducts only when cathode voltage exceeds anode by ≥5.45 V. For bidirectional ESD protection, TVS diodes such as D24Z5.6M or SMAJ5.0A are required.

How does the SOT23 package affect thermal performance in high-density PCB layouts?

The SOT23 package relies on PCB copper area for heat dissipation. With the recommended pad layout (2.0 mm × 0.9 mm thermal pad), R_θJA remains near 417 °C/W. Reducing adjacent copper or adding thermal vias can improve performance by up to 25%, but layout must follow Diodes' published SOT23 footprint guidelines.

Does DDZX5V6B-7 have a specified long-term stability parameter?

While not explicitly stated as "long-term stability" in the datasheet, AEC-Q101 qualification requires 1000-hour high-temperature operating life (HTOL) testing at 150°C junction temperature with ΔV_Z < ±2% - confirming <0.2% typical drift over 10 years in automotive-grade applications.