Nexperia USA Inc. PZTA14,115

Overview

PZTA14 from Nexperia is an NPN Darlington transistor in SOT223 (SC-73) package, designed for high-input-impedance pre-amplification with 500 mA max collector current, 30 V max collector-emitter voltage, and DC current gain up to 20,000 at IC = 100 mA. It operates reliably from −65 °C to +150 °C and delivers 1.25 W total power dissipation on standard PCB mounting.

For engineers reviewing the PZTA14 datasheet, PZTA14 pinout, PZTA14 application, or PZTA14 equivalent, key selection criteria include its Darlington architecture enabling ultra-high hFE (>10,000), low VCEsat (≤1.5 V @ IC = 100 mA), thermal resistance (Rth(j-sp) = 19 K/W), and dual-collector SOT223 footprint optimized for heatsinking in linear amplifier stages.

Technical Context

The PZTA14 implements a monolithic NPN Darlington pair with integrated base-emitter resistor network absent - requiring external base drive control. Its high hFE (10,000–20,000) enables microampere-level base current to switch 100 mA collector load, reducing driver-stage complexity in low-power analog signal chains.

Thermal design leverages the SOT223's exposed collector pad (pins 2 and 4) for direct PCB copper thermal conduction, achieving Rth(j-sp) = 19 K/W and supporting continuous operation at 500 mA with proper board layout. Electrical limits are defined per IEC 60134: VCBO = 30 V, VEBO = 10 V, and Tj ≤ 150 °C.

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 thermally enhanced exposed collector pad (pins 2 and 4).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Compared with MJD122G and ZTX1048A, the PZTA14 uniquely balances ultra-high hFE, dual-collector thermal performance, and SOT223 manufacturability - making it optimal for high-gain, medium-current linear amplification where thermal management and drive simplicity are prioritized over voltage headroom or ultra-small footprint.

Availability

PZTA14 is available at Aetrix Electronics and suitable for audio pre-amplifiers, industrial sensor interfaces, and relay driver circuits requiring stable component supply, consistent parametric performance across production lots, and long-term obsolescence mitigation.

Supply support for PZTA14 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.

The PZTA14 belongs to Nexperia's general-purpose bipolar transistor family, engineered specifically for cost-sensitive, thermally demanding linear and switching applications in industrial automation and consumer electronics.

FAQ

What is the maximum continuous collector current for PZTA14 under standard PCB mounting?

The PZTA14 supports 500 mA continuous collector current when mounted on a single-sided 1 cm² copper pad per Nexperia's limiting values table. This rating assumes Tamb ≤ 25 °C and accounts for thermal resistance Rth(j-a) = 100 K/W. Derating is required above 25 °C ambient - approximately 4.5 mA/°C reduction beyond 25 °C.

Can PZTA14 be used in automotive applications?

No - the PZTA14 is explicitly marked as non-automotive qualified in its revision history. It lacks AEC-Q101 qualification, has not undergone automotive stress testing, and carries no automotive reliability warranty. For automotive use, Nexperia offers the PZTA14-Q variant, which must be sourced separately and verified for specific vehicle subsystem requirements.

Why does PZTA14 have four pins but only three distinct terminals?

Pin 2 and Pin 4 are internally connected to the same collector node and share the exposed copper thermal pad. This dual-collector configuration improves current handling capacity and reduces thermal resistance (Rth(j-sp) = 19 K/W) by doubling the solder joint interface area between the die and PCB - a deliberate thermal enhancement unique to SOT223 Darlington transistors.

How does PZTA14's hFE vary with collector current and temperature?

hFE is specified as 10,000 minimum at IC = 10 mA and 20,000 typical at IC = 100 mA, both at VCE = 5 V and Tj = 25 °C. Per Figure 1 in the datasheet, hFE peaks near IC = 100 mA and declines at lower and higher currents. It also decreases approximately 0.5%/°C above 25 °C junction temperature, requiring gain-stabilizing emitter degeneration in precision amplifier designs.