Diodes Incorporated DDZX20C-13

Overview

DDZX20C-13 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 20 V nominal zener voltage (19.23–20.22 V), 10 mA test current, 28 Ω zener impedance at 1 kHz, and 300 mW power dissipation on FR-4 PCB. It delivers tight voltage tolerance and low leakage (0.05 µA at 15 V) for voltage reference and regulation in automotive and industrial power supplies.

For engineers reviewing the DDZX20C-13 datasheet, DDZX20C-13 pinout, DDZX20C-13 application, or DDZX20C-13 equivalent, this page provides verified electrical parameters, thermal derating behavior, temperature coefficient data, SOT23 terminal mapping, and AEC-Q101-compliant alternatives for stable voltage reference design.

Technical Context

This Zener diode operates in reverse breakdown with sharp knee characteristics, optimized for low-noise voltage reference and overvoltage clamping. Its 28 Ω dynamic impedance at 10 mA and ±0.5% typical VZ tolerance support high-accuracy feedback loops in DC-DC converters and sensor biasing circuits.

Thermal resistance is 417 °C/W (junction-to-ambient, FR-4), and power derating begins linearly above +25°C per Fig. 1. Temperature coefficient is +0.07 %/°C (typical) across 20–20.22 V range, confirmed in Fig. 17 and Fig. 18 of DS30408 Rev. 13-2.

Key Specifications

Pinout & Package

SOT23 package: 3-terminal plastic molded case, UL 94V-0 rated, matte tin annealed terminals, polarity indicated by cathode band. Weight ≈ 0.008 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C20-7-F and MMSZ4684T1G, DDZX20C-13 offers tighter VZ tolerance, lower impedance, and AEC-Q101 qualification-making it the sole choice for automotive and high-accuracy industrial references where long-term drift and qualification matter.

Availability

DDZX20C-13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input stages, medical patient monitor power rails, and energy meter reference subsystems requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for DDZX20C-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

DDZX20C-13 belongs to the DDZX series of precision Zener diodes, engineered specifically for high-reliability voltage reference and regulation in automotive, industrial, and medical applications demanding tight tolerance and AEC-Q101 compliance.

FAQ

What is the maximum continuous reverse voltage that DDZX20C-13 can withstand without breakdown?

DDZX20C-13 is designed to operate in reverse breakdown at its specified zener voltage range (19.23–20.22 V). It does not have a separate "maximum reverse voltage" rating outside breakdown; operation below 19.23 V results in negligible reverse current (<0.05 µA at 15 V), while sustained voltage above 20.22 V increases power dissipation and must remain within the 300 mW limit and thermal derating curve (Fig. 1).

Is DDZX20C-13 suitable for use in a shunt regulator with a 24 V input and 20 V output?

Yes - with a series current-limiting resistor sized to maintain IZ between 1 mA and 10 mA, DDZX20C-13 regulates at ~20 V. At 24 V input, the resistor must drop 4 V; for 5 mA Zener current, R = 4 V / 0.005 A = 800 Ω. Power in the resistor is 20 mW, well within standard ratings. Ensure junction temperature stays ≤150°C using the 417 °C/W RθJA value and ambient conditions.

Does DDZX20C-13 have a specified capacitance value for high-frequency noise filtering?

No specific capacitance is listed in DS30408 Rev. 13-2 for DDZX20C-13. However, Fig. 10 shows typical total capacitance for 20 V Zeners is ~1.5 pF at VR = 1 V and f = 1 MHz. This low value confirms suitability for high-frequency decoupling in reference paths but not as a primary RF filter element.

How does the temperature coefficient of DDZX20C-13 compare to lower-voltage Zeners in the same series?

DDZX20C-13 has a positive temperature coefficient of +0.07 %/°C (typ.), consistent with Fig. 17 and Fig. 18. This is higher than 6.2 V parts (~+0.02 %/°C) but lower than 33 V parts (~+0.09 %/°C), reflecting the intrinsic VZ vs. TC relationship in silicon Zeners - making it more stable than higher-voltage variants but less stable than mid-range 5–12 V devices.