Diodes Incorporated DDZ9712S-7

Overview

DDZ9712S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 28 V, ±3.5% tolerance (26.6–29.4 V), 50 µA maximum reverse leakage at 21.2 V, 200 mW power dissipation, and SOD-323 package. It delivers stable voltage reference in low-power analog circuits, including sensor biasing and ADC reference stabilization.

For engineers reviewing the DDZ9712S-7 datasheet, DDZ9712S-7 pinout, DDZ9712S-7 application, or DDZ9712S-7 equivalent, key selection criteria include zener voltage accuracy, temperature coefficient (±0.08%/°C typical), low leakage current, thermal resistance (625 °C/W), and RoHS-compliant "green" packaging for high-reliability industrial and automotive subsystems.

Technical Context

This device operates in reverse breakdown mode to maintain precise DC voltage regulation under varying load and temperature conditions. Its sharp knee characteristic and tight 3.5% V_Z tolerance enable accurate voltage clamping and reference generation without external trimming.

The SOD-323 package supports automated placement and reflow soldering, while its 0.004 g mass and UL 94V-0 molding compound meet stringent PCB space and safety requirements. Thermal resistance of 625 °C/W is specified for FR-4 boards with recommended pad layout per AP02001.

Key Specifications

Pinout & Package

Two-terminal SOD-323 package with cathode band marking; polarity critical for correct reverse-bias operation. Terminals are matte tin-plated Alloy 42 leads, solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27LT1G and MMSZ4694T1G, DDZ9712S-7 offers tighter 3.5% voltage tolerance and lower leakage-critical for high-accuracy references-while its SOD-323 footprint saves 35% board area versus SOT-23 and matches SOD-123 in height but with superior thermal performance per unit volume.

Availability

DDZ9712S-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive cabin control modules, medical diagnostic devices, and telecom power management units requiring stable component supply across multi-year production cycles.

Supply support for DDZ9712S-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, serving industrial, computing, communications, and consumer markets since 1959.

The DDZ9689S–DDZ9717S series targets high-precision, low-leakage voltage reference applications in space-constrained, thermally demanding environments-designed specifically for automated assembly and long-term stability in harsh operating conditions.

FAQ

What is the zener test current (I_ZT) for DDZ9712S-7?

The zener test current is 5 mA, as confirmed in the Electrical Characteristics table on page 2 of DS30409 Rev. 6-2. This current establishes the nominal 28 V zener voltage under thermal equilibrium at 30°C junction temperature, and is the standard condition for specifying V_Z, impedance, and temperature coefficient.

Does DDZ9712S-7 have AEC-Q101 qualification?

No-DDZ9712S-7 is not AEC-Q101 qualified. Only DDZ9705S (marked with Note 5) in this family carries AEC-Q101 qualification. DDZ9712S-7 meets industrial-grade reliability standards and operates across −65°C to +150°C, but lacks the stress-test validation required for automotive front-end applications.

What is the typical zener impedance (Z_ZT) at 5 mA for DDZ9712S-7?

Typical zener impedance is 110 Ω at I_Z = 5 mA and T_A = 25°C, derived from Figure 15 (Zener Impedance vs. V_Z) which covers DDZ9709S–DDZ9714S. At 28 V, the curve shows Z_Z ≈ 110 Ω, confirming low dynamic resistance for stable regulation under varying load.

Can DDZ9712S-7 replace a 27 V Zener in an existing design?

Yes-if the design accommodates a 1 V increase and maintains sufficient margin above the 21.2 V reverse voltage threshold. The 28 V nominal rating provides higher clamping headroom than 27 V parts, but requires verification of power dissipation (P = V × I) and thermal rise in the target layout, especially given its 200 mW limit and 625 °C/W R_θJA.