Diodes Incorporated DDZX9V1C-13

Overview

DDZX9V1C-13 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 9.1 V nominal zener voltage (8.83–9.30 V range at 20 mA), 300 mW power dissipation on FR-4 PCB, and 8 Ω zener impedance at test current. It delivers tight voltage tolerance, low leakage (0.5 µA at 7.0 V), and AEC-Q101 qualification for automotive-grade reliability in voltage reference and regulation circuits.

For engineers reviewing the DDZX9V1C-13 datasheet, DDZX9V1C-13 pinout, DDZX9V1C-13 application, or DDZX9V1C-13 equivalent, this part serves as a stable, low-noise 9.1 V reference in power supply feedback loops, overvoltage clamping, and analog signal conditioning where ±2.6% V_Z tolerance and <120 Ω knee impedance are critical design constraints.

Technical Context

This Zener diode operates in reverse breakdown mode with sharp knee characteristics, enabling precise voltage regulation across 0.5–20 mA zener current range. Its thermal resistance of 417 °C/W (junction-to-ambient, FR-4) and derating curve support stable operation up to +150 °C junction temperature.

The device exhibits a typical temperature coefficient of +0.06 %/°C near 9.1 V, confirmed by Figure 16–19 in DS30408 Rev. 13-2, and achieves <0.5 µA reverse leakage at VR = 7.0 V - critical for low-power sensing and battery-backed reference designs.

Key Specifications

Pinout & Package

SOT23 package: 3-terminal plastic surface-mount case with matte tin annealed terminals; polarity marked by cathode band on top view; weight ≈ 0.008 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C9V1 and MMSZ5240B, DDZX9V1C-13 offers the narrowest V_Z tolerance (±2.6%) and lowest Z_ZT (8 Ω) among SOT23 9.1 V Zeners, making it optimal for high-accuracy feedback and reference applications where voltage stability under varying current is paramount.

Availability

DDZX9V1C-13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, medical patient monitor power rails, and telecom DC-DC feedback networks requiring stable component supply with full traceability and lifecycle continuity.

Supply support for DDZX9V1C-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets with ISO/TS 16949 and ISO 14001 certifications.

This device belongs to Diodes' DDZX series of precision Zener diodes, engineered specifically for applications demanding tight voltage tolerance, low leakage, and AEC-Q101 compliance in space-constrained SOT23 layouts.

FAQ

What is the maximum continuous zener current for DDZX9V1C-13 at 25°C?

The device is rated for 20 mA test current (I_ZT) and supports continuous operation up to approximately 33 mA at 25°C ambient, calculated from P_D = 300 mW and V_Z ≈ 9.1 V. Derating is required above 25°C per Figure 1 - at 70°C ambient, max I_Z drops to ~22 mA.

Does DDZX9V1C-13 require a heatsink on standard FR-4 PCB?

No heatsink is required. With R_θJA = 417 °C/W and P_D = 300 mW, junction temperature rise is ~125°C above ambient - acceptable within the −65 to +150°C operating range when using the recommended SOT23 pad layout (2.0 mm × 0.9 mm copper area per Diodes' package outline guide).

How does the temperature coefficient affect regulation accuracy over −40 to +125°C?

Per Figure 16–19, DDZX9V1C-13 has a typical TC of +0.06 %/°C near 9.1 V. Over a 165°C span, this yields ~9.9 mV total drift (0.06 × 165 × 9.1), resulting in ±0.11% V_Z variation - well within its ±2.6% initial tolerance and suitable for most non-laboratory-grade references.

Can DDZX9V1C-13 replace DDZX9V1B in existing designs?

Yes, with verification of marking and tolerance: DDZX9V1C specifies tighter V_Z range (8.83–9.30 V) vs. DDZX9V1B (8.65–9.15 V), same SOT23 package, pinout, and electrical specs except for improved Z_ZT (8 Ω vs. 10 Ω). No layout or schematic changes are needed, but system-level validation of regulation stability is recommended.