Diodes Incorporated DDZX22D-13

Overview

DDZX22D-13 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 22 V nominal zener voltage (21.52–22.63 V at 5 mA), 300 mW power dissipation on FR-4 PCB, and 30 Ω zener impedance at test current - used for voltage regulation and reference in automotive-grade power supply rails and sensor biasing circuits.

For engineers reviewing the DDZX22D-13 datasheet, DDZX22D-13 pinout, DDZX22D-13 application, or DDZX22D-13 equivalent, this part supports stable low-current voltage reference design with tight ±2.5% V_Z tolerance, AEC-Q101 qualification, and low 0.05 µA reverse leakage at 17 V - critical for ECU voltage monitoring and analog front-end calibration.

Technical Context

This Zener diode operates in reverse breakdown mode with sharp knee characteristics, optimized for low-noise, high-stability reference generation under fixed-current bias. Its thermal resistance of 417 °C/W (junction-to-ambient, FR-4) and derating curve enable reliable operation up to +150 °C junction temperature.

The device exhibits a positive temperature coefficient near +0.08 %/°C at 22 V, confirmed by Fig. 18, and maintains <100 pF total capacitance - suitable for DC and low-frequency (<1 MHz) regulation where dynamic response is secondary to voltage accuracy and long-term stability.

Key Specifications

Pinout & Package

Package: SOT23 - three-terminal surface-mount plastic package with matte tin annealed terminals, UL 94V-0 rated molding compound, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C22LT1G and MMSZ5247B-TP, DDZX22D-13 delivers superior voltage accuracy (±2.5% vs. ±5%), lower dynamic impedance (30 Ω vs. ≥35 Ω), and full AEC-Q101 qualification - making it the only choice for production automotive voltage references where long-term drift and environmental robustness are mandated.

Availability

DDZX22D-13 is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor transmitters, and telecom power supervision systems requiring stable component supply with guaranteed long-term continuity.

Supply support for DDZX22D-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 manufacturing and test facilities across Asia and design centers in the US and Europe.

DDZX22D-13 belongs to the DDZX series of precision Zener diodes - engineered specifically for automotive and industrial applications demanding tight voltage tolerance, low leakage, and AEC-Q101 reliability certification.

FAQ

What is the maximum continuous reverse current for DDZX22D-13 before thermal runaway?

At 25°C ambient and mounted on FR-4 PCB with recommended pad layout, the absolute maximum reverse current is limited by power dissipation: I_Z(max) = 300 mW / 22 V ≈ 13.6 mA. Derating applies above 25°C per Fig. 1 - at 100°C ambient, max current drops to ~7.2 mA to maintain T_J ≤ 150°C.

Does DDZX22D-13 require external heat sinking in typical SOT23 layouts?

No external heatsink is required. With R_θJA = 417°C/W and P_D = 300 mW, junction-to-ambient rise is ~125°C at 25°C ambient - well within the -65°C to +150°C operating range. Standard SOT23 copper pads per Diodes' layout guide provide sufficient thermal conduction.

Can DDZX22D-13 be used in series or parallel configurations for higher voltage or current handling?

Series connection is acceptable for higher reference voltages (e.g., two DDZX22D-13 yield ~44 V), but matching unit-to-unit V_Z tolerance is critical. Parallel use is not recommended due to mismatched Zener impedances causing current imbalance and potential thermal instability.

Is the SOT23 pinout of DDZX22D-13 compatible with legacy Zener diodes like 1N4742A?

No. DDZX22D-13 uses SOT23 (anode-cathode-NC), while 1N4742A is DO-41 axial-leaded (cathode band). Even SOT23 Zeners like BZX84-C22LT1G share the same pinout (Pin 1 = anode, Pin 2 = cathode), but electrical parameters differ - direct substitution requires verification of V_Z, Z_ZT, and leakage.