Nexperia USA Inc. PZT4401/ZLX

Overview

PZT4401/ZLX from Nexperia is an NPN silicon switching transistor in SOT223 package, rated for 40 V V_CEO, 600 mA continuous collector current, and 1150 mW power dissipation at T_amb ≤ 25 °C. It delivers h_FE = 100–300 at I_C = 150 mA and V_CE = 2 V, with V_CE(sat) ≤ 750 mV at I_C = 500 mA / I_B = 50 mA, used in DC-DC converter switching stages and relay driver circuits.

For engineers reviewing the PZT4401/ZLX datasheet, PZT4401/ZLX pinout, PZT4401/ZLX application, or PZT4401/ZLX equivalent, key selection criteria include verified SOT223 thermal resistance (R_{th j-a} = 109 K/W), low V_BE(sat) (≤1.2 V at 500 mA), fast switching (t_off = 250 ns), and confirmed PNP complement PZT4403 for push-pull designs.

Technical Context

This device operates as a medium-power NPN bipolar junction transistor optimized for linear amplification and hard-switching applications. Its SOT223 package integrates a large copper collector pad to support 1.15 W dissipation under standard PCB mounting (1 cm² single-sided copper), and its f_T = 250 MHz enables stable operation up to high-frequency switching edges.

The base-emitter and collector-base junctions are designed for robust blocking (V_CBO = 60 V, V_EBO = 6 V) and low leakage (I_CBO ≤ 50 nA), while switching timing parameters-including t_d = 15 ns and t_r = 20 ns-are characterized using standardized test conditions (V_CC = 29.5 V, I_Con = 150 mA).

Key Specifications

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with exposed collector pad for enhanced thermal transfer; 4-terminal configuration where pins 2 and 4 are internally connected to the collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT4401 and ZTX450, PZT4401/ZLX uniquely balances 600 mA current, 250 ns switching, and SOT223 thermal performance-making it optimal for compact yet thermally demanding 200–400 kHz DC-DC and relay drivers where both power and speed matter.

Availability

PZT4401/ZLX is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converter switches, and LED current switches requiring stable component supply and long-term production continuity.

Supply support for PZT4401/ZLX 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 leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.

PZT4401/ZLX belongs to Nexperia's general-purpose bipolar transistor product line, engineered for reliable switching and linear amplification in cost-sensitive, thermally constrained PCB environments.

FAQ

Is PZT4401/ZLX RoHS compliant and lead-free?

Yes, PZT4401/ZLX is RoHS compliant and lead-free per Nexperia's standard qualification. The SOT223 package uses lead-free matte tin plating on terminations, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3. Full compliance documentation is available through Nexperia's product change notifications.

What is the recommended PCB layout for thermal performance?

For optimal thermal performance, use a minimum 1 cm² single-sided copper pad connected directly to pins 2 and 4 (collector), with thermal vias to inner/ground planes if multilayer. Avoid soldermask over the collector pad. The datasheet specifies R_{th j-a} = 109 K/W under these exact conditions-reducing pad area increases junction temperature proportionally.

Can PZT4401/ZLX replace BC847 in existing designs?

No-BC847 is an SOT-23 NPN transistor rated for only 100 mA I_C and 250 mW P_tot. PZT4401/ZLX has 6× higher current and 4.6× higher power capability, different pinout (SOT223 vs. SOT-23), and distinct thermal behavior. Direct replacement requires PCB redesign and thermal validation.

Does PZT4401/ZLX have avalanche rating or ruggedness data?

No, PZT4401/ZLX is not specified for avalanche energy (E_AS) or ruggedness testing. It lacks guaranteed unclamped inductive switching (UIS) capability. For inductive load switching (e.g., relays, motors), external flyback diodes must be used-per Nexperia's application guidance in AN11205.