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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. PBSS5240XX

Name: PBSS5240XX
Brand: Nexperia USA Inc.
SKU: PBSS5240XX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS5240XX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBSS5240XX.pdf

Description:: TRANS PNP 40V 2A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PBSS5240XX from Nexperia is a PNP low V_CEsat (BISS) transistor in SOT89 package, designed for high-efficiency switching in medium-power DC-DC converters and load drivers. It delivers −40 V V_CEO, −2 A continuous I_C, 310 mΩ R_CEsat at −1 A/−100 mA drive, and operates up to 150 °C junction temperature - enabling compact, thermally robust designs in battery-powered and LED backlighting systems.

For engineers reviewing the PBSS5240XX datasheet, PBSS5240XX pinout, PBSS5240XX application, or PBSS5240XX equivalent, key selection criteria include verified PNP BISS saturation performance, SOT89 thermal derating behavior, collector-emitter voltage margin for inductive flyback, and compatibility with low-voltage base drive circuits (e.g., 3.3 V MCU GPIO).

Technical Context

This device implements a Breakthrough In Small Signal (BISS) PNP structure optimized for minimal V_CEsat under high-current, low-V_BE drive conditions. Its design targets applications requiring <−310 mV V_CEsat at −1 A with −100 mA base current and stable h_FE ≥ 55 at −2 A pulsed operation.

Thermal performance is defined by three mounting configurations: standard SOT89 footprint (R_th(j-a) = 250 K/W), 1 cm² collector pad (132 K/W), and 6 cm² pad (93 K/W). Transient thermal impedance curves confirm suitability for repetitive 20 ms pulses with ≤0.33 duty cycle.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V - supports 36 V nominal supply rails with 10 % margin against transients in automotive and industrial DC-DC stages.
I_C (continuous)	−2 A - enables direct driving of medium-current loads like relays, buzzers, and multi-LED strings without external current amplification.
R_CEsat	310 mΩ at −1 A/−100 mA - reduces conduction loss to <310 mW, minimizing heatsink requirements in space-constrained SMT layouts.
h_FE	55 at −2 A pulsed - ensures sufficient current gain for reliable saturation with microcontroller-compatible base drive (e.g., −200 mA IB for −2 A IC).
f_T	150 MHz - supports switching frequencies up to ~10–20 MHz in Class-E or resonant driver topologies where gain-bandwidth trade-offs matter.
V_BEsat	−1.2 V at −1 A/−100 mA - confirms low base drive voltage overhead, compatible with 3.3 V logic while maintaining deep saturation.
P_tot (6 cm² pad)	1.35 W - allows sustained 1.35 W dissipation with proper PCB copper area, supporting >1 A continuous operation in thermally managed designs.

Pinout & Package

The PBSS5240XX is housed in a medium-power SOT89 plastic surface-mount package with an exposed die pad for enhanced thermal transfer. The package measures 4.6 mm × 2.6 mm × 1.8 mm and features gull-wing leads compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 (E)	Emitter	Common return path for collector current; connected to system ground or negative rail in high-side switch configurations.
2 (C)	Collector	Main power output terminal; electrically tied to the exposed die pad for low-inductance, high-current thermal path to PCB copper.
3 (B)	Base	Control input requiring negative bias relative to emitter to turn on; driven by open-drain or inverted logic outputs.

Key Features

Feature	Design Value
Low V_CEsat	−310 mV at −1 A/−100 mA enables >95 % efficiency in 5 V load-switching applications with minimal self-heating.
High I_CM	−3 A peak collector current supports surge handling in motor startup or relay coil energization without secondary protection.
Robust thermal rating	150 °C max T_j and 93 K/W R_th(j-a) with 6 cm² pad allow operation in sealed enclosures up to 85 °C ambient.
PNP BISS architecture	Optimized doping profile delivers higher h_FE and lower saturation resistance than standard PNP transistors at same geometry.
SOT89 mechanical stability	Reinforced leadframe and 1.5 mm lead length ensure mechanical reliability during board flexure and thermal cycling.

Applications

DC-to-DC Conversion

Supply Line Switching

Use Scenario: Step-down buck converter synchronous rectifier or low-side switch in portable power supplies.

IC Role / Device Role / Timing Role: PNP BISS switch operating in linear or saturated mode to minimize conduction loss during active phase.

Use Value: 310 mΩ R_CEsat reduces dropout voltage and improves light-load efficiency over conventional PNP devices.

Use Scenario: Hot-swap or reverse-polarity protection circuit in 12 V/24 V industrial control modules.

IC Role / Device Role / Timing Role: High-side PNP switch controlled by microcontroller GPIO to enable/disable downstream subsystems.

Use Value: −40 V V_CEO provides headroom for load-dump transients; −2 A rating covers typical module-level current demands.

Battery Charger

LCD Backlighting

Use Scenario: Charge path MOSFET gate driver or battery disconnect switch in single-cell Li-ion charger IC reference designs.

IC Role / Device Role / Timing Role: Low-V_CEsat PNP switch isolating battery from charging circuit during fault conditions.

Use Value: −1.2 V V_BEsat ensures full turn-on with 3.3 V logic; 150 °C T_j rating supports operation near battery cells.

Use Scenario: Current-regulated LED string driver in automotive instrument clusters or industrial HMI displays.

IC Role / Device Role / Timing Role: Constant-current sink or series pass element modulated via PWM base drive.

Use Value: Stable h_FE ≥ 55 at −2 A enables precise current matching across multiple parallel strings without feedback compensation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PMST5240X	SOT323 package; lower I_C (−1 A) and higher R_CEsat (450 mΩ); same V_CEO and h_FE.	Targeted for space-constrained signal-level switching, not medium-power load driving.	Select when board area is critical and current demand stays below 1 A.
BC807-40	SOT23 package; −45 V V_CEO, −500 mA I_C, 700 mΩ R_CEsat; general-purpose PNP, not BISS-optimized.	Used in low-current logic interfacing and level translation, not power switching.	Choose only for non-critical, low-power biasing where saturation voltage is not performance-limiting.

Compared with PMST5240X and BC807-40, PBSS5240XX uniquely balances −2 A capability, 310 mΩ R_CEsat, and SOT89 thermal performance - making it the only option among the three suitable for sustained 1–2 A load switching with minimal thermal derating.

Availability

PBSS5240XX is available at Aetrix Electronics and suitable for DC-to-DC conversion, supply line switching, and LCD backlighting applications requiring stable component supply, consistent parametric performance across production lots, and long-term manufacturability assurance.

Supply support for PBSS5240XX 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 and industrial-grade components.

PBSS5240XX belongs to Nexperia's BISS transistor product line, engineered specifically for high-efficiency, medium-power switching in battery-operated and thermally constrained systems - emphasizing low saturation loss and robust thermal behavior in standard SMT packages.

FAQ

What is the maximum safe continuous collector current for PBSS5240XX at 70 °C ambient?

At 70 °C ambient with a 6 cm² copper pad, the device's thermal resistance is 93 K/W. With a 150 °C max junction temperature, allowable ΔT is 80 K, permitting 0.86 W dissipation. Using R_CEsat = 310 mΩ, this supports ~1.66 A continuous I_C before exceeding thermal limits - confirmed by Fig. 1's derating curve for configuration [3].

Can PBSS5240XX replace an NPN transistor in a high-side switch configuration?

No - PBSS5240XX is a PNP device intended for high-side switching where the emitter connects to the positive rail and the load is grounded. Replacing an NPN requires inverting the control logic and verifying base drive compatibility; its complementary NPN part is PBSS4240X, not a drop-in replacement.

Is PBSS5240XX qualified for automotive applications?

No - the datasheet explicitly states "Non-automotive qualified products" in Section 11.3. It lacks AEC-Q101 qualification, automotive-specific testing, and guaranteed PPAP documentation. For automotive use, Nexperia offers AEC-Q101-qualified variants such as PBSS5240XZ.

How does the SOT89 package improve thermal performance versus SOT23?

The SOT89's larger die pad and thicker leadframe reduce R_th(j-a) to 93 K/W (with 6 cm² pad) versus >300 K/W typical for SOT23 - enabling ~3× higher continuous power dissipation. Its 1.5 mm lead length also improves mechanical retention during thermal cycling, critical for industrial power modules.

PBSS5240XX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 170mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 145 @ 1A, 5V

Power - Max:: 500 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBSS5240XX FAQ

1.How can I place an order for PBSS5240XX through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS5240XX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PBSS5240XX reliable?

The price and inventory of PBSS5240XX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS5240XX is usually 5 days.

3.What payment methods are accepted for PBSS5240XX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS5240XX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS5240XX?

PBSS5240XX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS5240XX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PBSS5240XX?

For technical support, including PBSS5240XX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS5240XX requirements.

6.How does Aetrix verify that PBSS5240XX is sourced from the original manufacturer or authorized distributors?

All PBSS5240XX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PBSS5240XX meets industry standards.

7.What is the process for return or replacement of PBSS5240XX?

All PBSS5240XX units undergo pre-shipment inspection (PSI). If there is an issue with PBSS5240XX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PBSS5240XX part is unused and in its original packaging.

Return procedure for PBSS5240XX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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