NXP Semiconductors PBSS2540E,115

Overview

PBSS2540E from Nexperia is an NPN low V_CEsat (BISS) transistor in SOT416 (SC-75) package, designed for high-efficiency switching in space-constrained DC-DC converters and MOSFET gate drivers. It delivers 40 V V_CEO, 500 mA continuous collector current, and a typical R_CEsat of 380 mΩ at I_C = 500 mA / I_B = 50 mA - enabling reduced conduction loss and thermal footprint in portable power stages.

For engineers reviewing the PBSS2540E datasheet, PBSS2540E pinout, PBSS2540E application, or PBSS2540E equivalent, key selection criteria include its low saturation resistance, high h_FE at high current (50 @ I_C = 500 mA), 250 MHz f_T, and compatibility with reflow-only assembly on FR4 PCBs with standard or enhanced thermal pads.

Technical Context

The PBSS2540E employs Breakthrough in Small Signal (BISS) bipolar technology to achieve significantly lower V_CEsat than conventional small-signal transistors while maintaining high h_FE across wide current ranges - 100 at I_C = 100 mA and 50 at I_C = 500 mA under V_CE = 2 V. Its 6 V V_EBO rating supports robust base drive in noisy environments.

Thermal performance is optimized for two mounting conditions: R_th(j-a) = 833 K/W on standard FR4 footprint and 500 K/W with a 1 cm² collector pad - directly enabling design trade-offs between board area and power handling. The device operates across −65 °C to +150 °C ambient and junction temperatures.

Key Specifications

Pinout & Package

SOT416 (SC-75) plastic surface-mount package: 1.75 mm × 0.95 mm × 0.7 mm body, 3-terminal single-row outline with gull-wing leads. Designed for high-density placement and reflow-only soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMN2004K-7 and PBSS2515E, the PBSS2540E uniquely balances 40 V blocking, 500 mA current, and SC-75 size - making it the only option for compact, medium-voltage bipolar switching where MOSFET gate drive complexity or voltage rating is prohibitive.

Availability

PBSS2540E is available at Aetrix Electronics and suitable for DC-to-DC conversion, MOSFET gate driving, and motor control applications requiring stable component supply, long-term industrial availability, and consistent parametric performance across production lots.

Supply support for PBSS2540E 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 business. It serves automotive, industrial, computing, and consumer markets with high-volume, high-reliability components.

The PBSS2540E belongs to Nexperia's BISS transistor family, engineered specifically for high-efficiency, space-constrained switching in portable and battery-powered systems where thermal density and conduction loss are critical.

FAQ

What is the maximum continuous collector current for PBSS2540E?

The PBSS2540E is rated for 500 mA continuous collector current (I_C) at T_amb ≤ 25 °C on a standard FR4 PCB. At elevated ambient temperatures or with reduced copper area, derating applies - e.g., ~350 mA at 70 °C ambient per the power derating curve in the datasheet. The PBSS2540E must not exceed its 150 mW total power dissipation limit under standard mounting conditions.

Does PBSS2540E support wave soldering?

No, PBSS2540E is qualified for reflow soldering only, as explicitly stated in Section 10 of its datasheet. The SOT416 (SC-75) package is not designed for wave soldering due to thermal mass asymmetry and lead geometry. Using wave soldering may cause solder bridging, tombstoning, or internal die stress - the PBSS2540E must be assembled using JEDEC-compliant reflow profiles.

What is the typical V_CEsat of PBSS2540E at full rated current?

The typical V_CEsat of PBSS2540E is 200 mV at I_C = 200 mA / I_B = 10 mA, and 250 mV maximum at I_C = 500 mA / I_B = 50 mA. This low saturation voltage is achieved via BISS process optimization and directly enables higher efficiency than standard small-signal transistors - a key specification confirmed in Table 7 of the PBSS2540E datasheet.

Is PBSS2540E pin-compatible with any PNP devices?

Yes, the PBSS2540E has a PNP complement: PBS3540E, as stated in Section 1.1 of the datasheet. Both share identical SOT416 (SC-75) package and pinout (Base-Emitter-Collector), but with reversed polarity - allowing direct use in complementary emitter-follower or push-pull configurations without layout changes. The PBS3540E matches the PBSS2540E's 40 V rating and 500 mA current capability.

What thermal resistance values apply to PBSS2540E under different PCB layouts?

The PBSS2540E exhibits R_th(j-a) = 833 K/W on a standard FR4 PCB (single-sided copper, tin-plated, no extended pad), and 500 K/W when mounted with a 1 cm² collector pad - per Table 6 of the datasheet. These values directly determine allowable power dissipation: 150 mW at 25 °C ambient for standard layout, and 250 mW with thermal enhancement. The PBSS2540E's thermal performance is thus layout-dependent and must be verified per actual board stack-up.