Nexperia USA Inc. PZTA42,115

Overview

PZTA42 from Nexperia is an NPN high-voltage transistor in SOT223 (SC-73) package, rated for 300 V V_CEO, 100 mA I_C, and 1.2 W P_tot at T_amb ≤ 25 °C. It serves as a switching or linear amplification device in high-voltage telephony interfaces, line drivers, and relay drivers where low leakage and stable h_FE > 25 at 1 mA are critical.

For engineers reviewing the PZTA42 datasheet, PZTA42 pinout, PZTA42 application, or PZTA42 equivalent, key selection factors include its 300 V collector-emitter breakdown rating, dual-collector SOT223 thermal design (R_th(j-sp) = 23 K/W), 20 nA I_CBO at 200 V, and compatibility with reflow/wave soldering footprints per Fig. 2 and Fig. 3.

Technical Context

The PZTA42 operates as a discrete NPN bipolar junction transistor optimized for high-voltage, low-current switching. Its structure supports V_CBO = 300 V and V_EBO = 6 V, with h_FE ranging from 25 (at 1 mA) to 40 (at 30 mA), enabling predictable gain across bias points in open-base configurations.

Thermal performance is defined by R_th(j-a) = 104 K/W on single-sided 1 cm² copper and R_th(j-sp) = 23 K/W to solder point-critical for PCB-level thermal management in space-constrained telecom modules. Its f_T = 50 MHz and C_re = 3 pF support moderate-frequency signal handling without parasitic oscillation.

Key Specifications

Pinout & Package

SOT223 (SC-73) plastic surface-mount package with integrated heatsink pad; 4-terminal layout (pins 1–4), 2.3 mm pitch, 6.5 × 3.5 × 1.65 mm body. Pin 1 = Base, Pins 2 & 4 = Collector (internally tied), Pin 3 = Emitter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA42 and ZTX450, the PZTA42 uniquely balances SMT manufacturability, 23 K/W solder-point thermal resistance, and verified reflow/wave compatibility-making it optimal for high-reliability telecom and industrial control modules where thermal density and assembly yield are critical.

Availability

PZTA42 is available at Aetrix Electronics and suitable for telephony interfaces, relay drivers, LED string switches, and high-voltage sensor bias circuits requiring stable component supply and long-term industrial lifecycle support.

Supply support for PZTA42 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

Nexperia is a global semiconductor expert specializing in high-performance, high-reliability discrete and logic devices, with leadership in automotive, industrial, and consumer power management solutions.

The PZTA42 belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for robust operation in telecom infrastructure, industrial control, and power interface applications where voltage resilience and thermal stability are non-negotiable.

FAQ

What is the maximum safe operating voltage for PZTA42 in a common-emitter configuration?

The absolute maximum V_CEO is 300 V with open base, per IEC 60134 limiting values. For reliable long-term operation, design should limit V_CE to ≤ 240 V under all conditions-including transients-to maintain ≥20% safety margin and ensure 150 °C max junction temperature compliance.

Can PZTA42 replace MPSA42 in existing through-hole designs?

No-PZTA42 uses SOT223 surface-mount packaging and cannot be directly substituted into TO-92 footprints. Mechanical adaptation requires PCB redesign. Electrical substitution is feasible only if the new layout accommodates SOT223 dimensions (6.5 × 3.5 mm) and dual-collector routing.

How does the dual-collector configuration affect PCB layout and thermal design?

Pins 2 and 4 are internally shorted collectors and must be connected to the same copper pour. This doubles current-carrying capacity and reduces thermal resistance to solder point by distributing heat across two pads-requiring symmetric copper area allocation and avoiding isolated traces between pins.

Is PZTA42 qualified for automotive applications?

No-per Nexperia's revision history (Table 8), PZTA42 v.3 explicitly states "Product changed to non automotive." It lacks AEC-Q101 qualification, temperature cycling validation, and automotive-grade traceability. Use only in industrial, telecom, or consumer applications.