Diodes Incorporated DZTA42-13

Overview

DZTA42-13 from Diodes Incorporated is a 300V NPN high-voltage transistor in SOT223 package, designed for switching applications requiring high breakdown voltage and moderate current handling. It delivers 500mA collector current, 1.86W power dissipation at TA=25°C, V_CE(sat) < 500mV at I_C=20mA/I_B=2mA, and supports operation from –55°C to +150°C - used in switch-mode power supplies and video output stages.

For engineers reviewing the DZTA42-13 datasheet, DZTA42-13 pinout, DZTA42-13 application, or DZTA42-13 equivalent, key selection criteria include verified BV_CEO ≥ 300V, thermal resistance R_θJC = 13°C/W, h_FE ≥ 25 at I_C=1mA, complementary PNP pairing with DZTA92, and JEDEC-qualified reliability for industrial-grade switching circuits.

Technical Context

This NPN bipolar junction transistor operates as a high-voltage switch with guaranteed BV_CEO and BV_CBO of 300V, enabling use in off-line SMPS primary-side snubbers and flyback clamp circuits. Its low V_CE(sat) (≤500mV) and high h_FE (up to 40 at I_C=30mA) support efficient base-driven switching with minimal conduction loss.

The device features a thermally optimized SOT223 package with R_θJC = 13°C/W and R_θJL = 41°C/W, allowing direct heat transfer from junction to case or collector lead. It meets JEDEC reliability standards and is rated for ESD HBM = 4kV, making it suitable for automated assembly and rugged industrial environments.

Key Specifications

Pinout & Package

Package: SOT223 - surface-mount plastic package with exposed collector tab for thermal conduction and mechanical anchoring; 0.112g mass; UL 94V-0 rated molding compound; matte tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Compared with ZTX653 and MJD122, DZTA42-13 uniquely balances 300V rating, SOT223 footprint, and 500mA capability - making it optimal for compact, medium-power industrial switching where voltage margin and board area are critical constraints.

Availability

DZTA42-13 is available at Aetrix Electronics and suitable for switch-mode power supplies, video output stages, and motor drivers requiring stable component supply, JEDEC-qualified reliability, and RoHS-compliant manufacturing.

Supply support for DZTA42-13 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 industrial, computing, and automotive markets.

The DZTA42 belongs to Diodes' high-voltage bipolar transistor product line, engineered for robust switching in off-line power conversion and signal amplification where voltage endurance and thermal stability are essential.

FAQ

What is the maximum continuous collector current for DZTA42-13 at 100°C ambient?

At T_A = 100°C, derating applies per the datasheet's thermal curves: with R_θJA = 67.7°C/W on standard layout, maximum allowable power dissipation drops to ~0.74W, limiting I_C to approximately 250mA for V_CE(sat) ≈ 0.5V. Actual limit depends on PCB copper area and airflow.

Is DZTA42-13 pin-compatible with DZTA92?

No - DZTA42-13 is an NPN transistor while DZTA92 is its complementary PNP counterpart; they share identical SOT223 package and pinout (Collector-Base-Emitter), but polarity reversal means direct substitution would invert circuit function and likely cause failure.

Does DZTA42-13 require a base resistor in typical switching applications?

Yes - the datasheet specifies I_B = 2mA for full saturation at I_C = 20mA, implying a base resistor is required to limit drive current. For microcontroller GPIO (3.3V/5V), a 1.5kΩ–2.2kΩ resistor ensures proper biasing without overstressing the driver.

Can DZTA42-13 be used in linear amplifier configurations?

Yes - its f_T = 50MHz and h_FE stability across I_C = 1–30mA support small-signal amplification, particularly in video output or audio preamp stages. However, power dissipation must remain within 1.86W derated for ambient temperature and PCB layout.