Diodes Incorporated DDZ14B-7

Overview

DDZ14B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 14.26 V (min 13.89 V, max 14.62 V), 10 mA test current, 16 Ω zener impedance at 1 kHz, and 0.05 µA reverse leakage at 11.0 V. It operates in SOD123 package and serves as voltage reference or overvoltage clamp in power supply feedback loops and analog signal conditioning circuits.

For engineers reviewing the DDZ14B-7 datasheet, DDZ14B-7 pinout, DDZ14B-7 application, or DDZ14B-7 equivalent, key selection criteria include zener voltage tolerance (±2.5%), low dynamic impedance, tight temperature coefficient (±0.05%/°C near 14 V), and automotive-grade reliability under AEC-Q101 qualification when ordered as DDZ14BQ-7.

Technical Context

This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its zener voltage is stabilized by controlled avalanche and Zener mechanisms, with dominant avalanche contribution above 6 V-confirmed by positive temperature coefficient behavior in the 13–14 V range per Figure 16–19.

Designed for stable DC reference generation, it delivers specified performance at I_ZT = 10 mA with V_Z measured under short-pulse conditions to minimize self-heating. Thermal resistance is 425 °C/W on minimal pad layout and 266 °C/W on 1-in² copper, directly impacting derated power dissipation in real PCB layouts.

Key Specifications

Pinout & Package

SOD123 is a two-terminal surface-mount plastic package with cathode identified by a molded band. The device has no polarity-sensitive pins beyond anode and cathode terminals; cathode connects to the banded end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C15LT1G and MMSZ5241BT1G, DDZ14B-7 offers tighter voltage tolerance, lower impedance, and superior thermal derating-making it preferred for precision regulation and automotive-grade reliability where V_Z stability and long-term drift matter.

Availability

DDZ14B-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery monitors, medical sensor interfaces, and PLC input protection circuits requiring stable component supply with full traceability and lifecycle support.

Supply support for DDZ14B-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 power management, signal integrity, and protection applications.

The DDZ series targets precision voltage reference needs in space-constrained, high-volume applications-designed specifically for automated assembly and demanding thermal environments in automotive and industrial systems.

FAQ

What is the maximum continuous power dissipation for DDZ14B-7 at +75°C ambient?

At T_L = +75°C, DDZ14B-7 supports 500 mW continuous power dissipation per the datasheet's Note 6. This rating assumes junction-to-lead thermal resistance R_ΘJL = 132°C/W and applies only when mounted on a board with adequate thermal relief-typically a large copper pour or thermal pad. Derating curves in Figure 1 must be consulted for intermediate temperatures.

Is DDZ14B-7 suitable for use in AEC-Q101-compliant automotive designs?

DDZ14B-7 itself is the commercial-grade part. For automotive qualification, the DDZ14BQ-7 variant is required-it is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949-certified facilities. The "Q" suffix denotes automotive-specific change control, lot traceability, and extended reliability testing including HTOL and temperature cycling.

How does the temperature coefficient behave near 14 V, and what impact does it have on circuit accuracy?

Near 14 V, DDZ14B-7 exhibits a positive temperature coefficient of approximately +0.05%/°C (per Figures 16–19), meaning V_Z increases slightly with temperature. Over −40°C to +125°C, this results in ~±0.8% total drift-well within its ±2.5% initial tolerance. In closed-loop regulators, this drift is largely compensated by system-level feedback.

Can DDZ14B-7 replace a 1N4742A in existing designs?

No-DDZ14B-7 is not a direct replacement for 1N4742A (12 V, 1 W, DO-41). It has different voltage (14.26 V vs. 12 V), lower power rating (294 mW vs. 1 W), and SOD123 surface-mount package versus through-hole DO-41. Substitution requires verifying voltage match, recalculating series resistor values, and validating thermal performance on the target PCB layout.