Nexperia USA Inc. PZTA14,135

Overview

PZTA14 from Nexperia is an NPN Darlington transistor in SOT223 (SC-73) surface-mount package, designed for high-input-impedance pre-amplification with 500 mA max collector current, 30 V max V_CEO, and DC current gain (h_FE) up to 20,000 at I_C = 100 mA. It operates reliably from −65 °C to +150 °C and delivers low saturation voltage (V_CE(sat) ≤ 1.5 V) under 100 mA/0.1 mA drive.

For engineers reviewing the PZTA14 datasheet, PZTA14 pinout, PZTA14 application, or PZTA14 equivalent, key selection considerations include its Darlington architecture enabling ultra-high h_FE, dual-collector thermal design in SOT223, 1.25 W power dissipation at T_amb ≤ 25 °C, and non-automotive qualification status per latest revision.

Technical Context

The PZTA14 implements a monolithic NPN Darlington pair with integrated base-emitter resistor network absent-requiring external base bias control. Its high h_FE (10,000–20,000) enables microampere-level base drive for milliampere collector loads, reducing upstream driver burden in low-power analog stages.

Thermal performance is defined by R_th(j-sp) = 19 K/W to solder point and R_th(j-a) = 100 K/W (PCB-mounted), leveraging the SOT223's exposed collector pad (pins 2 & 4) as primary heat path. Absolute maximum ratings include V_CBO = 30 V, V_EBO = 10 V, and I_CM = 800 mA peak.

Key Specifications

Pinout & Package

Package: SC-73 (SOT223) plastic surface-mount 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 MJD127G and ZTX1051A, the PZTA14 uniquely balances ultra-high h_FE, SOT223 mountability, and 30 V operation-making it optimal for compact, low-drive, medium-current pre-amplifier and interface roles where gain and thermal efficiency outweigh voltage headroom needs.

Availability

PZTA14 is available at Aetrix Electronics and suitable for audio pre-amplifier stages, relay driver interfaces, and industrial sensor interfaces requiring stable component supply, consistent parametric performance across production lots, and long-term commercial availability.

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 portfolio, engineered for cost-sensitive, thermally demanding applications where high current gain and robust SMT packaging are essential-especially in industrial automation, power supplies, and analog signal conditioning.

FAQ

Is the PZTA14 automotive-qualified?

No. Per the October 2025 datasheet revision history, the PZTA14 is explicitly designated as non-automotive qualified. It lacks AEC-Q101 certification and has not undergone automotive stress testing. For automotive use, Nexperia offers separate -Q qualified variants such as the PZTA14-Q, which must be specified separately and verified against vehicle-level requirements.

What is the function of Pin 4 on the PZTA14?

Pin 4 is a second collector terminal, internally connected to Pin 2. It serves to increase current-carrying capacity and enhance thermal conduction from the die to the PCB via the shared exposed collector pad. This dual-collector configuration lowers effective R_th(j-sp) to 19 K/W and improves reliability under sustained 500 mA loads.

Can the PZTA14 replace a standard NPN transistor like BC847 in a circuit?

No-direct substitution is not recommended. The PZTA14 is a Darlington pair with h_FE > 10,000 and V_BE(on) ≈ 2 V, whereas BC847 is a single NPN with h_FE ≈ 110–800 and V_BE(on) ≈ 0.7 V. Replacing BC847 with PZTA14 would cause excessive base current demand, incorrect biasing, and potential thermal runaway without circuit redesign.

What is the maximum allowable PCB copper area for the collector pad?

The datasheet specifies thermal characteristics assuming a 1 cm² single-sided, tin-plated copper pad for the collector (Pins 2 and 4). Increasing pad area beyond 1 cm² further reduces R_th(j-a), but no upper limit is defined. For production designs, maintain at least 1 cm² and ensure unbroken thermal vias to inner-layer ground planes if multilayer PCBs are used.