onsemi NSS40500UW3T2G

Overview

NSS40500UW3T2G from onsemi is a PNP bipolar junction transistor in WDFN3 package, rated for −40 V V_CEO, −5.0 A continuous I_C, and ultra-low V_CE(sat) down to −0.010 V at I_C = −0.1 A / I_B = −0.010 A. It delivers high DC current gain (h_FE = 250 min at I_C = −10 mA) and operates across −55 °C to +150 °C, enabling use in compact, high-efficiency DC–DC converters and battery-powered motor controls.

For engineers reviewing the NSS40500UW3T2G datasheet, pinout, applications, or equivalent options, key selection criteria include verified low saturation voltage under pulsed and continuous conditions, thermal performance on 500 mm² copper, validated switching times (t_d ≤ 70 ns, t_f ≤ 160 ns), and Pb-free WDFN3 package compatibility with automated SMT assembly.

Technical Context

This PNP transistor uses silicon planar epitaxial construction optimized for low-voltage, high-speed switching. Its e2PowerEdge architecture emphasizes ultra-low V_CE(sat) and linear h_FE behavior across I_C = −10 mA to −3.0 A, supporting direct drive from PMU outputs without external base resistors in many configurations.

Thermal design leverages the exposed thermal pad (R_JL = 23 °C/W) and dual dissipation ratings: 875 mW on 100 mm² PCB and 1.5 W on 500 mm² PCB. Switching performance is characterized at V_CC = −30 V with 15 mA base drive, confirming suitability for <1 MHz power switching in portable systems.

Key Specifications

Pinout & Package

Package: WDFN3 (Case 506AU), 2.0 × 2.0 mm body, 0.75 mm height, 0.35 mm pitch, thermally enhanced with exposed copper pad (Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP low V_CE(sat) transistor applications.

Compared with DMT3005LKQ-7, NSS40500UW3T2G offers 45% lower V_CE(sat) and superior thermal performance via exposed pad; versus NSV40500UW3T2G, it provides identical electrical behavior at lower cost and qualification overhead for non-automotive use cases.

Availability

NSS40500UW3T2G is available at Aetrix Electronics and suitable for DC–DC converters, portable motor controls, and automotive instrument cluster drivers requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for NSS40500UW3T2G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The e2PowerEdge family, including NSS40500UW3T2G, was engineered specifically for high-efficiency, low-voltage switching in space- and power-constrained portable electronics and automotive subsystems.

FAQ

What is the maximum continuous collector current rating for NSS40500UW3T2G?

The NSS40500UW3T2G is rated for −5.0 A continuous collector current (I_C) at T_A = 25 °C with 500 mm² copper PCB area. Derating applies above 25 °C at 11.8 mW/°C. This rating assumes proper thermal management via the exposed pad; on smaller PCBs (100 mm²), the limit drops to 875 mW (≈−2.5 A typical).

Does NSS40500UW3T2G support direct drive from PMU outputs?

Yes. The NSS40500UW3T2G's high h_FE (250 min at −10 mA) and low V_BE(sat) (−0.76 V typ at −1.0 A) enable direct connection to PMU control outputs without base resistors in many designs. Verified operation occurs with base drive currents as low as −10 mA, matching typical PMU GPIO sourcing capability.

What is the thermal resistance from junction to ambient for NSS40500UW3T2G?

NSS40500UW3T2G has two specified R_JA values: 143 °C/W on FR-4 with 100 mm² copper, and 85 °C/W on FR-4 with 500 mm² copper. The latter enables 1.5 W continuous dissipation. For thermal design, R_JL = 23 °C/W (junction-to-lead) is more relevant when using the exposed pad with internal ground plane coupling.

Is NSS40500UW3T2G suitable for analog amplifier applications?

Yes. The NSS40500UW3T2G exhibits linear DC current gain (h_FE = 250–150 across I_C = −10 mA to −3.0 A) and f_T = 100 MHz, making it suitable for low-frequency analog amplifiers and precision current sources. Its V_BE(on) = −0.80 V (typ) and low C_obo = 150 pF support stable biasing and bandwidth control in common-emitter configurations.

What package type and dimensions does NSS40500UW3T2G use?

NSS40500UW3T2G uses the WDFN3 package (Case 506AU): 2.0 × 2.0 mm body, 0.75 mm max height, 0.35 mm lead pitch, with an exposed thermal pad centered on the bottom. Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter. The package complies with JEDEC MO-229 and is optimized for reflow soldering per IPC-J-STD-020.