Nexperia USA Inc. PXT4403,115

Overview

PXT4403,115 from Nexperia is a PNP bipolar junction transistor designed for medium-power switching and linear amplification in industrial and consumer power management circuits. It delivers −600 mA DC collector current, −40 V collector-emitter breakdown voltage, and 200 MHz transition frequency in a thermally enhanced SOT89 package with exposed collector pad. Its low V_CE(sat) of −400 mV at −150 mA/−15 mA enables efficient low-voltage load switching in DC-DC converters and LED drivers.

For engineers reviewing the PXT4403,115 datasheet, PXT4403,115 pinout, PXT4403,115 application, or PXT4403,115 equivalent, key selection criteria include verified thermal resistance (R_th(j-s) = 30 K/W), guaranteed h_FE ≥ 100 at −150 mA, and validated switching times (t_off = 350 ns) under defined test conditions per Figure 7.

Technical Context

The PXT4403,115 operates as a discrete PNP switch with fixed emitter-collector polarity and base-controlled current amplification. Its design centers on high-current capability (−600 mA I_C) paired with low saturation voltage (−400 mV at −150 mA), enabling use in saturated-switching topologies where conduction loss must be minimized.

Thermal performance is defined by three mounting configurations: standard footprint (R_th(j-a) = 250 K/W), 1 cm² collector pad (156 K/W), and 6 cm² pad (113 K/W). Transient thermal impedance curves (Fig.3–Fig.5) confirm stable pulsed operation up to 1 ms with δ ≥ 0.01.

Key Specifications

Pinout & Package

The PXT4403,115 is housed in a plastic surface-mounted SOT89 (SC-62) package with an exposed collector pad for enhanced thermal dissipation. The package measures 4.6 mm × 2.6 mm × 1.6 mm and features tin-plated leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT4403 and ZTX603, the PXT4403,115 offers optimal balance of thermal performance (R_th(j-s) = 30 K/W), standardized SOT89 packaging, and production-proven reliability in automotive-qualified manufacturing lines-making it preferred for volume industrial power control designs.

Availability

PXT4403,115 is available at Aetrix Electronics and suitable for DC-DC converter high-side switches, LED constant-current drivers, and industrial relay drivers requiring stable component supply, consistent parametric performance, and long-term lifecycle availability.

Supply support for PXT4403,115 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 semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, automotive-qualified power MOSFETs, bipolar transistors, and logic devices.

The PXT4403,115 belongs to Nexperia's PNP switching transistor product line, engineered for robustness in industrial power management and consumer appliance control where thermal stability and parametric consistency are critical.

FAQ

What is the maximum allowable junction temperature for PXT4403,115?

The absolute maximum junction temperature (T_j) is +150 °C, as defined in the Limiting Values table. Operation above this threshold risks permanent degradation of h_FE and increased leakage currents. Thermal design must ensure T_j = T_amb + (P_diss × R_th(j-a)) stays within this limit under worst-case ambient and power conditions.

Does PXT4403,115 require a base resistor in switching applications?

Yes-a series base resistor is mandatory to limit IB and prevent excessive base current. For example, driving with a 3.3 V logic signal and targeting IB = −15 mA at V_BE(sat) ≈ −0.95 V requires R_B = (3.3 V − 0.95 V)/15 mA ≈ 157 Ω. Undersized resistors cause thermal overstress and premature failure.

Is PXT4403,115 RoHS compliant and halogen-free?

Yes-PXT4403,115 is manufactured per Nexperia's standard compliance program: fully RoHS 2011/65/EU compliant and halogen-free (IEC 61249-2-21), with material declarations available upon request. The "115" suffix denotes tape-and-reel packaging meeting J-STD-020 moisture sensitivity level 1.

How does the SOT89 package improve thermal performance over SOT23?

The SOT89 package incorporates an exposed collector pad that provides direct thermal path to PCB copper, achieving R_th(j-s) = 30 K/W-over 5× better than typical SOT23 (R_th(j-s) ≈ 160–200 K/W). This allows 2.2× higher continuous power dissipation (0.5 W vs. 0.23 W) under identical board conditions.