Diodes Incorporated DZ23C3V9-7-F

Overview

DZ23C3V9-7-F from Diodes Incorporated is a dual common-cathode 3.7–4.1 V Zener diode pair in SOT23 package, rated for 300 mW total power dissipation, with matched voltage tolerance (≤5% ΔV_Z), low dynamic impedance (95 Ω @ 5 mA), and negative temperature coefficient (−0.050 %/°C). It provides precision voltage reference and overvoltage clamping in space-constrained analog monitoring circuits.

For engineers reviewing the DZ23C3V9-7-F datasheet, DZ23C3V9-7-F pinout, DZ23C3V9-7-F application, or DZ23C3V9-7-F equivalent, this page delivers verified electrical specs, terminal mapping, thermal derating behavior, dual-Zener matching performance, and direct-fit alternatives for voltage regulation and protection design.

Technical Context

This dual Zener operates in reverse breakdown mode with two anodes sharing one cathode. Each diode exhibits stable regulation at I_ZT = 5.0 mA, with typical Zener impedance of 95 Ω and maximum knee impedance of 500 Ω at I_ZK = 1.0 mA.

The device is characterized across −65°C to +150°C ambient range, with thermal resistance R_θJA = 417 °C/W on FR4 board, and follows JEDEC reliability standards for high-reliability industrial use.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic case with matte tin-plated Alloy 42 leads, UL 94V-0 rated, moisture sensitivity level 1.

Key Features

Applications

Availability

DZ23C3V9-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, and low-power IoT node voltage reference applications requiring stable component supply and long-term obsolescence management.

Supply support for DZ23C3V9-7-F 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.

The DZ23 series belongs to Diodes' precision Zener diode product line, engineered specifically for dual-rail voltage reference, matched clamping, and space-constrained regulation in industrial, computing, and communications equipment.

Equivalent & Alternatives

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

Compared with BZX79-C3V9 and DZ23C3V9Q-7-F, the DZ23C3V9-7-F offers unique dual-anode/common-cathode integration for space-constrained dual-reference designs, while the Q-variant adds automotive qualification without altering electrical behavior.

FAQ

What is the maximum continuous Zener current per anode at 25°C ambient?

At T_A = 25°C, the 300 mW total power rating allows up to 76.9 mA per anode if only one is active, but simultaneous operation must stay within combined 300 mW limit. Derating begins above 25°C per Fig. 1 - at 85°C ambient, max total power drops to ~180 mW.

Is the cathode pin electrically isolated from the package tab or heatsink connection?

No internal metal tab or thermal pad exists in the SOT23 package; the cathode (Pin 2) is the sole electrical connection to the common cathode structure. The molded plastic case provides full electrical isolation - no thermal or electrical coupling to PCB copper beyond solder joint conduction.

Can DZ23C3V9-7-F replace two separate 1N4729A diodes in a circuit?

No - the 1N4729A is a single 4.3 V, 1 W Zener in DO-41 package. DZ23C3V9-7-F provides lower voltage (3.7–4.1 V), lower power (300 mW), and dual-anode topology. Direct substitution would cause undervoltage operation and insufficient power handling; redesign of biasing and layout is required.

Does the 5% ΔV_Z specification apply at all operating currents or only at I_ZT = 5 mA?

The ≤5% ΔV_Z between anodes is specified at I_ZT = 5 mA per diode, as stated in the Features section. At lower currents (e.g., 1 mA), mismatch may increase due to nonlinear knee characteristics; design margins should assume worst-case 5% only at nominal test current.