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

Nexperia USA Inc. PBSS5540X-QF

Name: PBSS5540X-QF
Brand: Nexperia USA Inc.
SKU: PBSS5540X-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS5540X-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBSS5540X-QF.pdf

Description:: TRANS PNP 40V 4A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PBSS5540X-QF from Nexperia is a PNP low V_CEsat transistor in SOT89 package, rated for −40 V V_CEO, −5 A continuous collector current, and 45 mΩ typical R_CEsat at −5 A/−500 mA drive; used as a high-efficiency medium-power switch in automotive battery management and DC/DC converter output stages.

For engineers reviewing the PBSS5540X-QF datasheet, PBSS5540X-QF pinout, PBSS5540X-QF application, or PBSS5540X-QF equivalent, key selection criteria include verified AEC-Q101 qualification, thermal resistance under defined PCB mounting conditions, V_CEsat performance at −5 A, and direct NPN complement availability (PBSS4540X-Q).

Technical Context

This PNP bipolar junction transistor operates in saturation switching mode with base-driven control logic, optimized for low conduction loss in unidirectional load paths. Its design targets stable gain (h_FE = 50 min at −5 A) and tight V_CEsat distribution (−375 mV max) under pulsed conditions (t_p ≤ 300 µs, δ ≤ 0.02).

Thermal behavior is characterized across three PCB mounting configurations: standard SOT89 footprint (R_th(j-a) = 225 K/W), 1 cm² collector pad (125 K/W), and 6 cm² pad (90 K/W), enabling accurate power derating in space-constrained automotive modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V: Maximum allowable collector-emitter voltage with base open; defines safe blocking capability in supply-line switching.
I_C	−4 A continuous: Rated DC collector current at T_amb ≤ 25 °C on standard FR4; supports sustained 5 A pulsed loads.
R_CEsat	45–75 mΩ typ/max at −5 A/−500 mA: Directly determines I²R conduction loss and thermal rise in high-current switching nodes.
V_CEsat	−375 mV max at −5 A/−500 mA: Enables <1 W dissipation at full rated current, reducing heatsink requirements.
h_FE	50 min at −5 A: Ensures sufficient current gain to sustain saturation with practical base drive (e.g., microcontroller GPIO + resistor).
T_j max	150 °C: Junction temperature limit aligned with AEC-Q101 automotive stress testing for long-term reliability.
f_T	60 MHz: Transition frequency confirms usable bandwidth for PWM frequencies up to ~1–2 MHz with margin.

Pinout & Package

SOT89 (SC-62/TO-243) plastic surface-mount package: 3-lead, 1.5 mm pitch, 4.5 × 2.5 × 1.5 mm body; collector tab forms exposed thermal pad on underside.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit node; tied to system ground or low-side return path in PNP high-side switch configuration.
2	Collector	Main power output terminal; electrically and thermally connected to PCB copper pour for heat dissipation.
3	Base	Control input; requires −500 mA peak drive to achieve specified R_CEsat and V_CEsat at −5 A load.

Key Features

Feature	Design Value
Low V_CEsat	−375 mV max at −5 A enables >98 % efficiency in 12 V supply switches with <1 W loss.
AEC-Q101 qualified	Stress-tested per Automotive Electronics Council standard for discrete semiconductors; suitable for under-hood ECUs and battery monitors.
High I_CM	−10 A peak (t_p ≤ 10 ms) supports motor stall or inrush current handling without failure.
Thermal robustness	R_th(j-sp) = 16 K/W to solder point allows direct thermal coupling to PCB, simplifying thermal design.
NPN complement	PBSS4540X-Q provides matched low-V_CEsat performance for push-pull or H-bridge topologies.

Applications

Supply Line Switching

Battery Management

Use Scenario: High-side power switch controlling 12 V accessory rail in automotive body control module.

IC Role / Device Role / Timing Role: PNP transistor operating in saturation as load disconnect switch with fast turn-off via base pull-up.

Use Value: Low 45 mΩ R_CEsat limits voltage drop to <250 mV at 5 A, preserving downstream voltage regulation.

Use Scenario: Cell balancing or charge path isolation in 48 V mild-hybrid battery pack monitoring unit.

IC Role / Device Role / Timing Role: Bidirectional current-blocking element controlled by MCU GPIO during fault detection or state transitions.

Use Value: −40 V V_CEO rating safely handles transients up to ISO 7637-2 Pulse 5a; AEC-Q101 ensures lifetime reliability.

DC/DC Converter

Medium-Power Driver

Use Scenario: Synchronous rectifier or freewheeling switch in non-isolated buck converter for ADAS camera power supply.

IC Role / Device Role / Timing Role: Low-loss PNP switch replacing Schottky diode in secondary-side conduction path.

Use Value: −375 mV V_CEsat reduces conduction loss by >40 % vs. 0.5 V Schottky, improving efficiency at 3–5 A loads.

Use Scenario: Driving 24 V buzzer or small relay coil in infotainment system audio feedback circuit.

IC Role / Device Role / Timing Role: Medium-power interface buffer between low-current MCU output and inductive load.

Use Value: −5 A I_C rating accommodates relay inrush (3× steady-state), while h_FE ≥ 50 ensures reliable turn-on with 5 mA base drive.

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
DMT3005LPSQ-13	−30 V V_CEO, −3.5 A I_C, 65 mΩ R_CEsat; smaller SOT23 package	Limited to lower-voltage (<24 V) consumer-grade systems; not AEC-Q101 qualified	Select when board space is critical and automotive qualification is unnecessary.
MMBT5551-TP	NPN general-purpose transistor; −160 V V_CEO, 600 mA I_C; no low-V_CEsat optimization	Unsuitable for high-current switching; intended for signal amplification, not power control	Reject for any application requiring >1 A load current or <500 mV saturation voltage.

Compared with DMT3005LPSQ-13 and MMBT5551-TP, PBSS5540X-QF uniquely delivers automotive-qualified −40 V/−5 A switching with 45 mΩ R_CEsat in SOT89 - enabling compact, thermally efficient designs where reliability and conduction loss are jointly constrained.

Availability

PBSS5540X-QF is available at Aetrix Electronics and suitable for automotive battery management, DC/DC converter output stages, and medium-power driver circuits requiring stable component supply and AEC-Q101 compliance.

Supply support for PBSS5540X-QF 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

PBSS5540X-QF belongs to Nexperia's Automotive Qualified Low V_CEsat Transistor product line, engineered specifically for high-reliability, high-efficiency power switching in harsh-environment automotive subsystems.

FAQ

What is the maximum continuous collector current for PBSS5540X-QF at 70 °C ambient?

At T_amb = 70 °C, the maximum continuous collector current is derated to approximately −2.8 A based on the FR4 PCB standard footprint power derating curve (Fig. 1, curve 1). This assumes no additional heatsinking and aligns with the 2.5 W P_tot limit at 25 °C and linear derating above 25 °C.

Does PBSS5540X-QF require a base resistor, and what value is recommended for 5 A switching?

Yes - a base resistor is required to limit IB to −500 mA peak. With a −5 V drive and −1.2 V V_BEsat, a 7.6 Ω resistor (±5 %) delivers nominal −500 mA. For robustness against V_BE variation and temperature drift, a 6.8 Ω resistor is commonly used in production designs.

Can PBSS5540X-QF be used in parallel for higher current capacity?

No - bipolar transistors exhibit negative thermal feedback but lack inherent current-sharing stability. Parallel operation without individual emitter resistors risks thermal runaway. For >5 A, select a single higher-rated device (e.g., PBSS5350X-Q) or use MOSFET alternatives with positive temperature coefficient.

Is the SOT89 package lead-free and RoHS compliant?

Yes - PBSS5540X-QF is manufactured with lead-free terminations and complies with EU RoHS Directive 2011/65/EU and REACH SVHC regulations. The device marking "%1G" includes site code and conforms to Nexperia's green packaging standards.

PBSS5540X-QF 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):: 4 A

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

Vce Saturation (Max) @ Ib, Ic:: 375mV @ 500mA, 5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 500mA, 2V

Power - Max:: 550 mW

Frequency - Transition:: 60MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBSS5540X-QF FAQ

1.How can I place an order for PBSS5540X-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS5540X-QF 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 PBSS5540X-QF reliable?

The price and inventory of PBSS5540X-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS5540X-QF is usually 5 days.

3.What payment methods are accepted for PBSS5540X-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS5540X-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS5540X-QF?

PBSS5540X-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS5540X-QF 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 PBSS5540X-QF?

For technical support, including PBSS5540X-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS5540X-QF requirements.

6.How does Aetrix verify that PBSS5540X-QF is sourced from the original manufacturer or authorized distributors?

All PBSS5540X-QF 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 PBSS5540X-QF meets industry standards.

7.What is the process for return or replacement of PBSS5540X-QF?

All PBSS5540X-QF units undergo pre-shipment inspection (PSI). If there is an issue with PBSS5540X-QF, 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 PBSS5540X-QF part is unused and in its original packaging.

Return procedure for PBSS5540X-QF:

1.Submit a request within 90 days.

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

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