Diodes Incorporated DDZ9685-7

Overview

DDZ9685-7 from Diodes Incorporated is a surface-mount low-current Zener diode with nominal zener voltage 3.6 V (min 3.42 V, max 3.78 V), rated for 500 mW power dissipation on FR-4 PCB at TL = +75°C, specified at low test current of 50 µA, and packaged in SOD123. It serves as a precision voltage reference or overvoltage clamp in portable battery-powered circuits requiring stable low-bias operation.

For engineers reviewing the DDZ9685-7 datasheet, DDZ9685-7 pinout, DDZ9685-7 application, or DDZ9685-7 equivalent, this part is selected for low-leakage (<7.5 µA @ VR = 2 V), tight voltage tolerance (±5%), and thermal stability in space-constrained consumer and industrial power management designs.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its 3.6 V nominal zener voltage exhibits a temperature coefficient near zero crossing - typical for mid-range Zeners - enabling improved stability in ambient temperature variations from –65°C to +150°C.

The device uses a planar silicon junction structure optimized for low leakage (≤7.5 µA at VR = 2 V) and low dynamic impedance (typical 120 Ω at IZT = 50 µA), supporting accurate regulation in low-power analog monitoring and biasing circuits where minimal quiescent current is critical.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 2.65 mm (E) × 1.55 mm (D) × 1.2 mm (A); weight ≈ 0.01 g; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C3V6 and MMSZ4685, DDZ9685-7 offers superior low-current regulation accuracy, tighter voltage tolerance, and lower thermal resistance - making it optimal for battery-critical and thermally constrained applications where 50 µA bias and 500 mW dissipation headroom are design requirements.

Availability

DDZ9685-7 is available at Aetrix Electronics and suitable for battery management systems, portable sensor nodes, USB interface protection, and industrial analog input conditioning requiring stable component supply and consistent parametric performance across production lots.

Supply support for DDZ9685-7 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 power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.

DDZ9685-7 belongs to the DDZ9678–DDZ9717 family of low-current Zener diodes designed specifically for portable, battery-powered, and space-constrained applications demanding precise low-bias voltage references.

FAQ

What is the maximum reverse voltage (VR) at which DDZ9685-7 guarantees ≤7.5 µA leakage?

DDZ9685-7 guarantees ≤7.5 µA reverse leakage current at VR = 2 V, as specified in the Electrical Characteristics table. This condition applies at TA = +25°C and is validated per short-duration pulse testing to minimize self-heating effects. At VR = 1 V, leakage drops further - typically below 1 µA - supporting ultra-low-quiescent designs.

Can DDZ9685-7 be used in automotive applications?

Yes - the automotive-grade variant DDZ9685Q-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. The standard DDZ9685-7 is not automotive-qualified; for automotive use, specify the Q-suffix version and confirm compliance with your Tier-1's change control requirements.

What is the typical zener impedance (ZZT) of DDZ9685-7 at 50 µA?

The typical zener impedance (ZZT) of DDZ9685-7 is 120 Ω at IZT = 50 µA and TA = +25°C, as derived from Figure 11 in DS30410 Rev. 17–2. This value reflects dynamic resistance in the breakdown region and directly impacts regulation accuracy under varying load currents in reference circuits.

Is the SOD123 package of DDZ9685-7 compatible with reflow profiles per J-STD-020?

Yes - DDZ9685-7's SOD123 package has moisture sensitivity level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH without baking prior to reflow. Its matte tin annealed terminals are qualified for lead-free reflow per IPC/JEDEC J-STD-020, supporting peak temperatures up to 260°C.