Diodes Incorporated DDZ9705Q-7

Overview

DDZ9705Q-7 from Diodes Incorporated is a surface-mount, low-current, AEC-Q101 qualified Zener diode in SOD123 package with nominal zener voltage of 18 V (min 17.1 V, max 18.9 V), 50 µA test current, and 0.05 µA maximum reverse leakage at 13.6 V. It delivers stable voltage reference in automotive sensor signal conditioning and battery-powered microcontroller reset circuits.

For engineers reviewing the DDZ9705Q-7 datasheet, DDZ9705Q-7 pinout, DDZ9705Q-7 application, or DDZ9705Q-7 equivalent, this part supports low-bias precision regulation in space-constrained automotive ECUs, portable instrumentation, and industrial IoT edge nodes where thermal stability and RoHS/Green compliance are mandatory.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage tolerance (±5%) and low dynamic impedance - typical zener impedance is 45 Ω at I_Z = 1 mA per Fig. 13. Its temperature coefficient is +0.08 %/°C near 18 V, enabling predictable drift compensation in ambient ranges from –65°C to +150°C.

The device uses alloy 42 leadframe with matte tin annealed terminals, rated for 500 mW power dissipation on FR-4 PCB at T_L = +75°C, and exhibits 150 °C/W junction-to-lead thermal resistance - critical for thermal design in high-density automotive modules.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case (UL 94V-0), 0.01 g weight, cathode band marking, compatible with automated pick-and-place and reflow soldering.

Key Features

Applications

Availability

DDZ9705Q-7 is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable medical devices, industrial PLC analog inputs, and smart meter power supplies requiring stable component supply with AEC-Q101 traceability and green compliance.

Supply support for DDZ9705Q-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 consumer markets.

The DDZ9xxxQ series belongs to Diodes' AEC-Q101 qualified Zener diode product line, engineered specifically for voltage reference and overvoltage protection in harsh-environment automotive electronics.

FAQ

What is the maximum power dissipation of DDZ9705Q-7 under standard PCB conditions?

DDZ9705Q-7 is rated for 500 mW power dissipation when mounted on an FR-4 PCB with minimum recommended pad layout at lead temperature (T_L) = +75°C. Derating begins linearly above +75°C, reaching zero dissipation at +150°C ambient per Figure 1 in DS30410 Rev. 17-2.

Is DDZ9705Q-7 pin-compatible with other SOD123 Zener diodes?

Yes - DDZ9705Q-7 uses the standard SOD123 package with cathode-band polarity marking and identical mechanical dimensions (2.65 mm × 1.55 mm body, 0.30 mm lead length). All SOD123 Zeners share the same footprint, but electrical parameters (V_Z, I_ZT, I_R) must be verified for functional interchangeability.

Does DDZ9705Q-7 require derating for operation at elevated ambient temperatures?

Yes - thermal derating is required. At T_A = +100°C, maximum allowable power drops to approximately 250 mW based on R_θJA = 340 °C/W and the 150°C maximum junction temperature limit. Full derating curve is provided in Figure 1 of the datasheet.

What is the typical zener impedance of DDZ9705Q-7 and how does it affect regulation performance?

Typical zener impedance is 45 Ω at I_Z = 1 mA (per Fig. 13), decreasing to ~35 Ω at 5 mA. This low dynamic impedance ensures minimal output voltage variation (<18 mV) for ±1 mA load current changes - critical for maintaining ADC reference accuracy in precision analog systems.