Nexperia USA Inc. PZTA44-QX

Overview

PZTA44-Q from Nexperia is an AEC-Q101-qualified NPN high-voltage transistor in SOT223 (SC-73) package, rated for 400 V V_CEO, 300 mA I_C, and 1.35 W P_tot at T_amb ≤ 25 °C; used as a switching element in automotive telecommunication power supplies and HV bias circuits.

For engineers reviewing the PZTA44-Q datasheet, PZTA44-Q pinout, PZTA44-Q application, or PZTA44-Q equivalent, key selection criteria include verified high-voltage blocking capability, automotive-grade reliability under thermal stress, junction-to-solder-point thermal resistance of 10 K/W, and dual-collector pin configuration for enhanced heatsinking in space-constrained PCB layouts.

Technical Context

This discrete NPN transistor operates with open-base V_CEO = 400 V and V_CBO = 500 V, supporting high-side switching in offline AC/DC auxiliary rails. Its h_FE ranges from 40 to 200 across I_C = 1–100 mA at V_CE = 10 V and T_amb = 25 °C, enabling stable current amplification in linear and saturated modes.

Thermal design relies on R_th(j-sp) = 10 K/W to solder point and R_th(j-a) = 91 K/W in free air, with T_j max = 150 °C and T_stg = −65 to 150 °C. The SOT223 package features two collector terminals (Pins 2 & 4) electrically tied internally for improved thermal conduction and current sharing.

Key Specifications

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with 4 leads, 2.3 mm pitch, 6.5 mm × 3.5 mm × 1.65 mm body, and integrated heatsink pad on collector terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD44H11-TP and ZTX653, PZTA44-Q uniquely combines AEC-Q101 qualification, 400 V blocking, dual-collector thermal optimization, and 150 °C junction rating-making it the only option qualified for safety-critical automotive power switching where reliability and thermal headroom are mandatory.

Availability

PZTA44-Q is available at Aetrix Electronics and suitable for automotive HVAC control, telecom line interface, and industrial auxiliary power supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for PZTA44-Q 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 focused on essential efficiency, delivering high-performance logic, discrete, and MOSFET devices optimized for automotive, industrial, and computing markets.

The PZTA44-Q belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor family, engineered specifically for robust switching in automotive power management and telecom infrastructure where voltage resilience and thermal stability are critical.

FAQ

What is the maximum allowable base current for PZTA44-Q?

The absolute maximum peak base current is 100 mA for single pulses ≤1 ms, per Table 5. For continuous operation, base current must be limited to ensure I_C ≤ 300 mA and V_CE(sat) remains within spec-typically I_B ≤ 10 mA at I_C = 100 mA using h_FE ≥ 40. Exceeding this risks thermal runaway or bond-wire failure.

Can PZTA44-Q replace a TO-92 transistor in existing designs?

No direct drop-in replacement exists due to SOT223's larger footprint, dual-collector pins, and different thermal profile. Layout redesign is required to accommodate 6.5 mm × 3.5 mm body size, 2.3 mm lead pitch, and dedicated copper pour for Pin 2/Pin 4 collectors. Thermal performance will improve, but mechanical fit and soldering process must be requalified.

Is the emitter-base voltage rating sufficient for reverse-bias protection?

Yes-V_EBO = 6 V (open collector) provides adequate margin for typical base-emitter reverse bias in switching applications. However, sustained reverse bias >3 V should be avoided without external clamping, as IEBO leakage rises to 100 nA at 25 °C and increases significantly at elevated temperature.

How does the dual-collector configuration affect PCB layout?

Pins 2 and 4 are internally shorted collectors and must be connected to the same net-ideally a large copper pour acting as a heatsink. The footprint in Figure 11 shows separate solder lands; both require equal thermal relief and full copper fill. Separating them electrically violates the internal construction and degrades thermal performance and current handling.