Diodes Incorporated DDZX27D-13

Overview

DDZX27D-13 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 27 V nominal zener voltage (26.29–27.64 V), 5 mA test current, 45 Ω zener impedance at IZT, and 300 mW power dissipation on FR-4 PCB. It delivers tight voltage tolerance and low leakage (<0.05 µA at 21 V) for voltage reference and regulation in automotive-grade power management circuits.

For engineers reviewing the DDZX27D-13 datasheet, DDZX27D-13 pinout, DDZX27D-13 application, or DDZX27D-13 equivalent, this part is selected for stable low-power voltage clamping, precision biasing in analog front-ends, and overvoltage protection in industrial sensor interfaces where AEC-Q101 reliability and ±2.5% VZ tolerance are critical.

Technical Context

This Zener diode operates in reverse breakdown with sharp knee characteristics, optimized for low-noise voltage reference generation at 5 mA test current. Its thermal resistance (RθJA = 417 °C/W) and derating curve support operation up to +150 °C ambient when mounted per recommended SOT23 pad layout.

The device exhibits a positive temperature coefficient (~0.08 %/°C at 27 V, per Fig. 18), enabling predictable drift behavior in temperature-varying environments. Its 0.5 µA maximum reverse current at VR = 21 V ensures minimal standby power loss in high-impedance bias networks.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic case with matte tin annealed terminals, UL 94V-0 rated, 0.008 g weight, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27LT1G and MMSZ5256ET1G, DDZX27D-13 offers tighter VZ tolerance (±2.5% vs ±5%), lower leakage (0.05 µA vs 0.1 µA), and AEC-Q101 qualification - making it the only choice for automotive-grade 27 V reference designs requiring long-term drift stability and production traceability.

Availability

DDZX27D-13 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog input protection, and medical infusion pump power monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for DDZX27D-13 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with operations across Asia, Europe, and the Americas.

This part belongs to the DDZX series of precision Zener diodes, engineered for high-reliability voltage reference and regulation in automotive, industrial, and medical systems demanding AEC-Q101 qualification and tight parametric control.

FAQ

What is the maximum continuous power dissipation for DDZX27D-13 on standard FR-4 PCB?

The DDZX27D-13 is rated for 300 mW power dissipation when mounted on FR-4 PCB using the manufacturer-recommended pad layout. Derating begins linearly above +25 °C ambient, reaching zero dissipation at +150 °C per Figure 1. Thermal performance depends strictly on copper area and via count per the published SOT23 footprint.

Is DDZX27D-13 suitable for use in automotive applications?

Yes - DDZX27D-13 is fully qualified to AEC-Q101 standards, including HTOL, temperature cycling, and HAST testing. It carries the "Q" suffix variant (DDZX27DQ) for automotive-specific traceability, but the -13 reel version shares identical die, assembly, and qualification data per DS30408 Rev. 13.

How does the temperature coefficient affect voltage stability across −40 °C to +125 °C?

Per Figure 18, DDZX27D exhibits a typical temperature coefficient of +0.08 %/°C near 27 V. Over −40 °C to +125 °C, this results in approximately ±1.3% total VZ shift relative to +25 °C, assuming linear behavior - consistent with its use in applications where absolute accuracy is secondary to repeatability and low drift.

Can DDZX27D-13 replace older Zener diodes like 1N4750A in existing designs?

No - DDZX27D-13 is a 27 V Zener, while 1N4750A is a 27 V device but in DO-41 package with 1 W rating, 35 Ω impedance, and no AEC-Q101 qualification. Direct replacement requires verifying thermal design (SOT23 vs DO-41), leakage (<0.05 µA vs 5 µA), and board-level reliability requirements before substitution.