Nexperia USA Inc. PBSS4250X,115

Overview

PBSS4250X,115 from Nexperia is an AEC-Q101-qualified NPN low V_CEsat transistor in SOT89 package, rated for 50 V V_CEO, 2 A continuous collector current, and 380 mV V_CEsat at I_C = 2 A / I_B = 100 mA. It serves as a high-efficiency switching element in low-voltage power control circuits such as DC/DC converters and battery chargers.

For engineers reviewing the PBSS4250X,115 datasheet, PBSS4250X,115 pinout, PBSS4250X,115 application, or PBSS4250X,115 equivalent, key selection criteria include its low saturation voltage, automotive qualification, thermal resistance on FR4 (225 K/W), SOT89 footprint compatibility, and PNP complement PBSS5250X for complementary designs.

Technical Context

This device operates as a discrete NPN bipolar junction transistor optimized for saturated-switching applications where minimal conduction loss and thermal management are critical. Its design emphasizes low V_CEsat (≤380 mV) and high DC current gain (h_FE ≥150 at I_C = 2 A), enabling efficient operation in 3.3 V–12 V supply rails.

The SOT89 package provides enhanced thermal performance over standard SOT23 variants, with R_th(j-sp) = 16 K/W to solder point and validated mounting pad guidelines for 1 cm² and 6 cm² copper areas. It is not a logic-level MOSFET or integrated driver - base-current-driven switching requires external current-limiting resistor design.

Key Specifications

Pinout & Package

SOT89 (SC-62) flat-lead surface-mount plastic package: 3-pin, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body, with exposed collector tab for thermal conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-V_CEsat transistor applications.

Compared with NSS40501MR6T1G and DXTN20020CTR, PBSS4250X,115 delivers superior thermal robustness (R_th(j-a) = 225 K/W on FR4), guaranteed automotive qualification, and tighter V_CEsat consistency across production lots - critical for safety-critical load switching.

Availability

PBSS4250X,115 is available at Aetrix Electronics and suitable for DC/DC converters, battery chargers, and automotive body electronics requiring stable component supply and AEC-Q101 compliance.

Supply support for PBSS4250X,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 semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient power solutions.

PBSS4250X,115 belongs to Nexperia's "Low V_CEsat Transistor" product line, engineered specifically for high-efficiency, thermally constrained switching in automotive and industrial power management systems.

FAQ

Is PBSS4250X,115 pin-compatible with PBSS5250X?

No - PBSS4250X,115 is NPN; PBSS5250X is its PNP complement. Pinout order (E-C-B) is identical, but polarity reversal means they cannot be substituted without circuit redesign. Both share SOT89 mechanical footprint and thermal pad layout, enabling dual-layout board designs.

What base resistor value is recommended for 3.3 V MCU drive?

For full saturation at I_C = 2 A, minimum I_B = 13.3 mA (assuming h_FE = 150). With 3.3 V GPIO and V_BEsat ≈ 1.1 V, R_B = (3.3 − 1.1) V / 13.3 mA ≈ 165 Ω. Use 150 Ω ±5% 0805 resistor; verify actual V_CEsat < 400 mV under load in final layout.

Does PBSS4250X,115 require a flyback diode when driving relays?

Yes - as a bipolar transistor, it lacks intrinsic body diode. An external fast-recovery diode (e.g., 1N4148 or BAT54) must be placed cathode-to-collector, anode-to-emitter to clamp inductive kickback and prevent V_CE overshoot beyond 50 V.

Can PBSS4250X,115 replace a MOSFET in low-side switching?

Only if gate drive voltage and current sourcing limitations make MOSFETs impractical. Unlike MOSFETs, this BJT requires continuous base current (≥10 mA) and has higher conduction loss than logic-level MOSFETs at <1 A. Use only where cost, footprint, or legacy BJT design constraints apply.