onsemi NSS40300CTWG

Overview

NSS40300CTWG from onsemi is a PNP bipolar power transistor in LFPAK4 5×6 package, rated for 40 V V_CEO, 3.0 A continuous collector current, and ultra-low 0.070 V typical V_CE(sat) at I_C = 0.5 A / I_B = 50 mA. It delivers high h_FE (200–600) and 160 MHz f_T, targeting high-efficiency, space-constrained DC-DC converters in portable battery-powered devices.

For engineers reviewing the NSS40300CTWG datasheet, pinout, applications, or equivalent options, key selection criteria include its wettable-flank LFPAK4 package for automotive optical inspection, AEC-Q101 qualification (via NSV variant), low saturation voltage under high-current switching, and thermal resistance of 58 °C/W (junction-to-case).

Technical Context

This PNP transistor operates in linear and saturated switching modes with verified V_CE(sat) ≤ 0.400 V at I_C = 3.0 A / I_B = 0.3 A and V_BE(sat) = 1.0 V at I_C = 1.0 A / I_B = 0.1 A. Its f_T = 160 MHz and C_ob = 40 pF support high-speed switching in synchronous rectification and load-switching topologies.

The device is thermally optimized for PCB-mounted operation: R_θJC = 58 °C/W and R_θJA = 149 °C/W on minimal 7.6 mm² copper pad, enabling compact thermal design in portable electronics where junction temperature must stay within –55 to +150 °C.

Key Specifications

Pinout & Package

Package: LFPAK4 5×6 (Case 760AB), 4.90 × 4.15 × 1.15 mm, Pb-free, with wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS40300CTWG, NSV40300CTWG adds automotive traceability without electrical or thermal trade-offs, while ZXTN25050DFH trades wettable flanks and lower V_CE(sat) for higher voltage rating and legacy packaging-making NSS40300CTWG optimal for cost-sensitive, space-constrained, AOI-compliant portable and automotive applications.

Availability

NSS40300CTWG is available at Aetrix Electronics and suitable for DC-DC converters, portable device load switching, and automotive body control modules requiring stable component supply, RoHS compliance, and Pb-free assembly compatibility.

Supply support for NSS40300CTWG 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 specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NSS40300CTWG belongs to onsemi's e2PowerEdge family of low V_CE(sat) transistors, engineered specifically for high-efficiency, high-density power management in battery-powered and automotive systems where thermal performance and optical inspectability are critical.

FAQ

What is the maximum continuous collector current rating for NSS40300CTWG?

The NSS40300CTWG is rated for 3.0 A continuous collector current at T_C = 25 °C, as specified in the Absolute Maximum Ratings table. Derating applies above 25 °C case temperature per the power derating curve in Figure 1. This rating assumes proper PCB copper area (1″ sq. FR-4) and thermal management to maintain junction temperature within –55 to +150 °C limits. The NSS40300CTWG supports peak currents up to 5.0 A for short pulses.

Does NSS40300CTWG meet automotive qualification standards?

The NSS40300CTWG itself is not AEC-Q101 certified; however, its automotive-grade counterpart NSV40300CTWG uses identical die and LFPAK4 package and is fully AEC-Q101 qualified and PPAP capable. NSS40300CTWG shares all electrical, thermal, and mechanical specifications with the NSV variant-only differing in marking prefix and documentation scope. For automotive production, NSV40300CTWG is the designated qualified part, but NSS40300CTWG may be used in non-PPAP development or non-safety-critical subsystems.

What is the typical V_CE(sat) of NSS40300CTWG at 3.0 A collector current?

The typical V_CE(sat) of NSS40300CTWG at I_C = 3.0 A and I_B = 0.3 A is 0.400 V, as stated in the Electrical Characteristics table under ON CHARACTERISTICS. This value is measured at T_C = 25 °C and reflects real-world saturation behavior under high-current switching conditions. At lower currents (e.g., 0.5 A), V_CE(sat) drops to 0.070 V typical-demonstrating strong current gain linearity across its operating range. The NSS40300CTWG maintains this performance with minimal thermal drift up to 150 °C junction temperature.

Is the LFPAK4 package of NSS40300CTWG compatible with standard reflow profiles?

Yes, the LFPAK4 5×6 package of NSS40300CTWG is Pb-free and RoHS compliant, and it supports standard lead-free reflow soldering profiles per J-STD-020. Its wettable flanks are designed for reliable solder joint formation and automated optical inspection-not for altering reflow parameters. Thermal mass and profile compatibility are validated in onsemi's Soldering and Mounting Techniques Reference Manual (SOLDERRM/D). The NSS40300CTWG achieves robust solder joint integrity without requiring special preheat or cooling ramp adjustments beyond JEDEC Class 3 guidelines.

How does the h_FE of NSS40300CTWG vary with collector current?

The h_FE of NSS40300CTWG decreases predictably with increasing collector current: minimum 200 at I_C = 0.5 A, 175 at I_C = 1.0 A, and 100 at I_C = 3.0 A (all at V_CE = 1.0 V). This behavior is confirmed in both the Electrical Characteristics table and Figure 2–3 of the datasheet. The NSS40300CTWG maintains usable gain down to 100 even at full rated current, enabling stable base drive design across its entire 0.01–3.0 A operational range without gain collapse or thermal runaway.