Diodes Incorporated DZTA42Q-13

Overview

DZTA42Q-13 from Diodes Incorporated is a 300V NPN high-voltage bipolar junction transistor (BJT) in SOT223 package, designed for automotive-grade switching applications. It delivers 500mA collector current, 1.86W power dissipation at TA=25°C, V_CE(sat) < 500mV @ 20mA/2mA, and AEC-Q101 qualification for under-hood SMPS and motor driver stages.

For engineers reviewing the DZTA42Q-13 datasheet, DZTA42Q-13 pinout, DZTA42Q-13 application, or DZTA42Q-13 equivalent, key selection criteria include high-voltage blocking (V_CEO = 300V), low saturation voltage, thermal resistance (R_θJA = 67.7°C/W on 25mm × 12mm 2oz Cu), and IATF 16949 manufacturing compliance.

Technical Context

This NPN BJT operates as a high-voltage switch with guaranteed BV_CEO ≥ 300V and BV_CBO ≥ 300V, enabling use in 200–250V DC bus topologies. Its h_FE ≥ 25 at IC = 1mA ensures reliable base drive in low-current control circuits.

Thermal design is supported by R_θJC = 13°C/W (junction-to-case) and R_θJL = 41°C/W (junction-to-leads), allowing direct heatsinking via the collector lead. ESD robustness includes 4kV HBM and 400V MM ratings per JEDEC standards.

Key Specifications

Pinout & Package

Package: SOT223 - Molded plastic case with matte tin-plated terminals, UL 94V-0 rated, moisture sensitivity level 1, weight ≈ 0.112 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX653 and MJD127, DZTA42Q-13 uniquely balances 300V blocking, automotive qualification, SOT223 thermal performance, and low saturation-making it optimal for space-constrained, high-reliability 240V-derived power conversion.

Availability

DZTA42Q-13 is available at Aetrix Electronics and suitable for switch-mode power supplies, video output stages, and automotive motor drivers requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for DZTA42Q-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 operations certified to IATF 16949 and ISO 9001 standards.

The DZTA42Q belongs to Diodes' automotive-qualified high-voltage BJT product line, engineered specifically for robust switching in harsh-environment power conversion and actuator control systems.

FAQ

What is the maximum continuous collector current for DZTA42Q-13 at 100°C ambient?

At T_A = 100°C, derating applies: P_D drops to 0.97W (per note 6), limiting I_C to approximately 300mA assuming V_CE(sat) ≈ 450mV. This is calculated using I_C = √(P_D/R_θJA × ΔT), not absolute maximum rating alone.

Is DZTA42Q-13 pin-compatible with its complementary PNP counterpart DZTA92?

Yes-DZTA42Q (NPN) and DZTA92 (PNP) share identical SOT223 pinout: Collector (Pin 1), Base (Pin 2), Emitter (Pin 3). This enables direct use in complementary emitter-follower or push-pull output stages without layout changes.

Does the SOT223 package require special PCB layout for thermal performance?

Yes-the exposed collector tab must be soldered to a minimum 25mm × 12mm area of 2oz copper to achieve the rated R_θJA = 67.7°C/W. Smaller pads increase thermal resistance to 129.7°C/W, reducing safe operating power by >45%.

Can DZTA42Q-13 replace older DZT851 transistors in existing designs?

No-DZT851 has V_CEO = 60V and TO-92 package; DZTA42Q-13's 300V rating, SOT223 footprint, and 5× higher power dissipation make it incompatible without board redesign and thermal validation.