Diodes Incorporated DDZ9694T-7

Overview

DDZ9694T-7 from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 8.2 V (min 7.79 V, max 8.61 V), 150 mW power dissipation, 50 µA test current, 0.1 µA reverse leakage at 6.2 V, and SOD523 package. It provides precise voltage regulation in low-power biasing, reference, and protection circuits for portable electronics and sensor interfaces.

For engineers reviewing the DDZ9694T-7 datasheet, DDZ9694T-7 pinout, DDZ9694T-7 application, or DDZ9694T-7 equivalent, this page delivers verified electrical parameters, thermal derating behavior, zener impedance vs. voltage, temperature coefficient profile, and SOD523 mechanical layout - all critical for precision analog design and board-level ESD/overvoltage clamping.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under controlled current conditions. Its sharp knee characteristic and low leakage (0.1 µA @ VR = 6.2 V) enable accurate voltage referencing in low-current applications such as ADC references and microcontroller reset supervision.

The device exhibits a temperature coefficient of approximately +0.06 %/°C near 8.2 V (per Fig. 16), indicating moderate positive drift with temperature - a key consideration when used in ambient-variable environments like automotive cabin modules or industrial sensor nodes.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact 2-pin surface-mount plastic case (0.85 mm × 1.25 mm × 0.65 mm), cathode marked by band, matte tin-plated alloy 42 leadframe, moisture sensitivity level 1.

Key Features

Applications

Availability

DDZ9694T-7 is available at Aetrix Electronics and suitable for portable power management, industrial sensor signal conditioning, and microcontroller reset supervision requiring stable component supply and long-term manufacturability.

Supply support for DDZ9694T-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, energy-efficient components for industrial, computing, and consumer markets.

This device belongs to the DDZ9689T–DDZ9717T Zener diode series, engineered for precision voltage reference and low-leakage clamping in space-constrained, low-power applications.

FAQ

What is the maximum zener current for continuous operation?

The DDZ9694T-7 is rated for 150 mW total power dissipation. At its nominal 8.2 V zener voltage, this corresponds to a maximum average zener current of approximately 18.3 mA under ideal thermal conditions. Derating per Figure 1 applies above +25°C ambient; at +85°C, usable current drops to ~11 mA on standard FR-4.

Does this diode have a specified zener impedance?

Yes - typical zener impedance is 40 Ω at IZT = 50 µA (per Fig. 11), rising to ~120 Ω at 1 mA and falling to ~25 Ω at 10 mA. This value directly impacts regulation stability under varying load currents in reference applications.

Can DDZ9694T-7 replace a 1N4738A in existing designs?

No - the 1N4738A is an axial-lead 8.2 V, 1 W Zener in DO-41 package, while DDZ9694T-7 is a 150 mW, SOD523 surface-mount device. Differences in power handling, thermal path, and package geometry preclude direct substitution without board redesign and thermal validation.

Is the SOD523 package compatible with standard reflow profiles?

Yes - the device is qualified for IPC/JEDEC J-STD-020D Level 1 moisture sensitivity and uses matte tin annealed terminations compliant with MIL-STD-202 Method 208. It supports standard lead-free reflow profiles (peak 260°C, <60 sec above 217°C) without popcorn or delamination risk.