Diodes Incorporated DDZ9704Q-7

Overview

DDZ9704Q-7 from Diodes Incorporated is a surface-mount, low-current Zener diode with a nominal zener voltage of 17 V (min 16.15 V, max 17.85 V), rated for 500 mW power dissipation on FR-4 PCB at TL = +75°C, specified at 50 µA test current, and housed in an AEC-Q101 qualified SOD123 package for automotive applications including voltage reference and overvoltage protection in battery-powered ECUs.

For engineers reviewing the DDZ9704Q-7 datasheet, DDZ9704Q-7 pinout, DDZ9704Q-7 application, or DDZ9704Q-7 equivalent, this part is selected for precision low-bias voltage regulation in space-constrained automotive modules where thermal stability, low leakage (<0.05 µA @ 12.9 V), and IATF 16949 traceability are critical.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 17 V nominal zener voltage exhibits a positive temperature coefficient (~0.07 %/°C per Fig. 18), and it delivers <1 Ω dynamic impedance at I_ZT = 50 µA, enabling accurate voltage clamping in feedback loops and reference circuits.

The device uses a planar epitaxial construction with cathode band marking, optimized for automated placement on SOD123 footprints. With R_θJA = 340 °C/W and R_θJL = 150 °C/W, thermal performance is validated on standard FR-4 boards using Diodes Inc.'s recommended pad layout.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: L = 0.25–0.40 mm, D = 1.40–1.70 mm, E = 2.55–2.85 mm, weight ≈ 0.01 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-current Zener voltage reference applications.

Compared with BZX84-C16LT1G and MMSZ5246BS-7-F, DDZ9704Q-7 uniquely combines 17 V nominal voltage, sub-0.05 µA leakage, and full automotive qualification-making it the sole choice for AEC-compliant 17 V reference designs demanding lowest possible bias current and production traceability.

Availability

DDZ9704Q-7 is available at Aetrix Electronics and suitable for automotive body electronics, engine management systems, and ADAS camera modules requiring stable component supply with guaranteed long-term continuity and full PPAP documentation.

Supply support for DDZ9704Q-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.

The DDZ9xxxQ series belongs to Diodes' AEC-Q101 qualified Zener diode product line, engineered specifically for automotive voltage reference and protection applications where low leakage, thermal stability, and supply chain traceability are mandatory.

FAQ

What is the maximum allowable reverse voltage before breakdown for DDZ9704Q-7?

The DDZ9704Q-7 begins controlled zener breakdown at a minimum of 16.15 V and reaches full regulation by 17.85 V. It is not rated for sustained operation above 17.85 V in reverse bias; exceeding this risks thermal runaway unless current is strictly limited by external series resistance to maintain P_D ≤ 500 mW.

Does DDZ9704Q-7 have polarity marking, and how is it identified?

Yes-DDZ9704Q-7 uses a cathode band marking on the SOD123 package body. The banded end is the cathode terminal; the unmarked end is the anode. This matches industry-standard SOD123 polarity orientation and must be aligned with PCB silkscreen and footprint polarity indicators during placement.

Can DDZ9704Q-7 replace a 15 V Zener in an existing design?

No-DDZ9704Q-7 is a 17 V device with a 16.15–17.85 V range; substituting it for a 15 V Zener will raise the regulated voltage by ≥1.15 V, potentially overvolting downstream ICs. For 15 V replacement, DDZ9702Q-7 (15 V nominal) is the direct series equivalent with identical packaging and qualification.

Is the 500 mW power rating valid at room temperature or elevated ambient?

The 500 mW rating applies when mounted on FR-4 PCB with Diodes Inc.'s recommended pad layout and measured at TL = +75°C (lead temperature), not ambient. At T_A = +25°C, derating curves (Fig. 1) show usable power exceeds 500 mW; however, system-level thermal design must ensure T_L does not exceed +75°C to maintain rated performance.