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

Nexperia USA Inc. PBSS5540Z-QF

Name: PBSS5540Z-QF
Brand: Nexperia USA Inc.
SKU: PBSS5540Z-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS5540Z-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: PBSS5540Z-QF.pdf

Description:: TRANS PNP 40V 5A SOT-223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PBSS5540Z-QF from Nexperia is a 40 V, −5 A PNP low V_CE(sat) transistor in SOT223 (SC-73) package, optimized for high-current switching with 55 mΩ typical R_CE(sat) at −2 A/−200 mA drive and AEC-Q101 qualified for automotive use in battery management and DC/DC converters.

For engineers reviewing the PBSS5540Z-QF datasheet, PBSS5540Z-QF pinout, PBSS5540Z-QF application, or PBSS5540Z-QF equivalent, this page delivers verified electrical parameters, thermal resistance values, base-emitter saturation behavior, automotive qualification status, and validated alternative transistors for supply-line and MOSFET driver designs.

Technical Context

This PNP transistor operates as a high-efficiency power switch with low conduction loss, leveraging optimized doping and geometry to achieve ≤80 mΩ R_CE(sat) under pulsed conditions (t_p ≤ 300 µs, duty ≤ 0.02) at T_amb = 25 °C. Its −40 V V_CEO rating supports 12 V and 24 V automotive rail switching.

Thermal design is enabled by dual collector terminals and an exposed thermal pad compatible with 1 cm² or 6 cm² FR4 copper pads, delivering R_th(j-a) of 92 K/W or 62 K/W respectively. The device uses standard silicon bipolar process technology without integrated protection circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V - Maximum safe collector-emitter voltage with open base; enables use in 24 V automotive systems with margin.
I_C	−5 A - Continuous collector current rating; supports motor drivers and lamp loads up to 60 W at 12 V.
R_CE(sat)	55 mΩ typ - Equivalent on-resistance at −2 A/−200 mA; reduces conduction loss to <110 mW vs. >500 mW for standard PNP devices.
h_FE	50–150 - DC current gain at −5 A/−500 mA; ensures reliable saturation with moderate base drive in high-side switches.
V_CE(sat)	−250 mV max at −5 A/−500 mA - Low saturation voltage directly lowers power dissipation and thermal stress.
T_j max	150 °C - Maximum junction temperature; allows operation in under-hood environments with proper PCB heatsinking.
R_th(j-a)	62 K/W - Thermal resistance with 6 cm² copper pad; enables 2 W continuous dissipation at ≤75 °C ambient.

Pinout & Package

SOT223 (SC-73) plastic surface-mounted package with 4 leads, 2.3 mm pitch, 6.5 mm × 3.5 mm × 1.65 mm body, and dual collector terminals (Pins 2 and 4) for enhanced thermal and current handling.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input requiring −200 mA to saturate at −2 A; driven by microcontroller GPIO or dedicated driver IC.
2	Collector	Main high-current output terminal; electrically tied to Pin 4 for parallel current path and improved thermal spreading.
3	Emiter	Common emitter connection; referenced to system ground or positive rail depending on high-side/low-side configuration.
4	Collector	Second collector terminal; must be connected to same net as Pin 2 to realize full rated current and thermal performance.

Key Features

Feature	Design Value
Low V_CE(sat)	−250 mV max at −5 A ensures <1.25 W conduction loss, reducing heatsink requirements in space-constrained modules.
AEC-Q101 qualification	Stress-tested per automotive discrete semiconductor standard; supports PPAP documentation and zero-defect manufacturing programs.
Dual collector terminals	Pins 2 and 4 provide redundant current paths and lower effective thermal resistance when both are soldered to large copper areas.
High I_CM	−10 A peak (1 ms pulse) enables robust surge handling in motor startup and strobe flash discharge circuits.
Wide T_amb range	−65 °C to +150 °C operation supports deployment in engine control units, battery junction boxes, and industrial UPS systems.

Applications

Battery Management Systems (BMS)

Automotive DC/DC Converters

Use Scenario: High-side main battery disconnect switch in 12 V/48 V hybrid architectures.

IC Role / Device Role / Timing Role: PNP power switch controlling battery isolation during fault conditions or sleep mode.

Use Value: 55 mΩ R_CE(sat) limits voltage drop to <110 mV at 2 A, preserving state-of-charge monitoring accuracy and reducing self-heating.

Use Scenario: Synchronous rectifier or pre-regulator switch in 12 V → 5 V/3.3 V buck converters.

IC Role / Device Role / Timing Role: High-current PNP switch in non-isolated step-down topology with external PWM controller.

Use Value: −40 V V_CEO and 150 °C T_j rating ensure reliability across load dump transients and under-hood thermal cycling.

MOSFET Gate Drivers

Strobe Flash Units

Use Scenario: Level-shifting high-side driver for N-channel power MOSFETs in motor control H-bridges.

IC Role / Device Role / Timing Role: Fast-turn-on PNP switch sourcing gate current to pull MOSFET gate above supply rail.

Use Value: h_FE ≥ 50 at −5 A enables direct MCU GPIO drive without external buffer, simplifying layout and BOM.

Use Scenario: Primary discharge switch for xenon or LED strobes in automotive lighting and ADAS camera systems.

IC Role / Device Role / Timing Role: High-pulse-current PNP switch discharging capacitor banks into flash loads.

Use Value: −10 A I_CM rating handles 5–10 ms flash pulses without thermal runaway, validated per AEC-Q101 transient stress tests.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS40501UW3T1G	−40 V V_CEO, −4.5 A I_C, 90 mΩ R_CE(sat); SOT-323 package; no AEC-Q101 qualification.	Limited to consumer-grade portable equipment due to smaller package and lack of automotive qualification.	Select when board space is critical and automotive compliance is not required; verify thermal derating on 0.5 cm² pad.
Diodes Incorporated DXT5551Q-13	−40 V V_CEO, −5 A I_C, 75 mΩ R_CE(sat); SOT223 package; AEC-Q101 qualified; h_FE min 100 at −2 A.	Higher h_FE reduces base drive requirement but exhibits 36 % higher R_CE(sat), increasing conduction loss by ~100 mW at −2 A.	Prefer for designs needing lower base current; accept trade-off in efficiency and thermal margin versus PBSS5540Z-QF.

Compared with NSS40501UW3T1G and DXT5551Q-13, PBSS5540Z-QF delivers the lowest R_CE(sat) (55 mΩ) and highest thermal capability (62 K/W with 6 cm² pad), making it optimal for high-reliability automotive power switching where efficiency and junction temperature control are critical.

Availability

PBSS5540Z-QF is available at Aetrix Electronics and suitable for battery management systems, automotive DC/DC converters, and MOSFET driver circuits requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101-compliant sourcing.

Supply support for PBSS5540Z-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 semiconductors, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and mobile markets.

PBSS5540Z-QF belongs to Nexperia's Automotive Qualified Low V_CE(sat) Transistor product line, engineered specifically for high-efficiency power switching in harsh-environment automotive subsystems such as body control modules and power distribution units.

FAQ

What is the maximum continuous collector current for PBSS5540Z-QF?

The maximum continuous collector current (I_C) is −5 A at T_amb ≤ 25 °C with a 6 cm² copper pad. Derating applies above 25 °C ambient: linear reduction to zero at 150 °C junction temperature, governed by R_th(j-a) = 62 K/W. At 85 °C ambient, usable I_C is approximately −3.2 A.

Is PBSS5540Z-QF pin-compatible with its NPN complement PBSS4540Z-Q?

No - PBSS5540Z-QF is a PNP transistor with Base (Pin 1), Collector (Pins 2 & 4), and Emitter (Pin 3); PBSS4540Z-Q is an NPN device with identical SOT223 pinout but reversed polarity: Emitter (Pin 1), Collector (Pins 2 & 4), Base (Pin 3). Circuit redesign is required for functional substitution.

Does PBSS5540Z-QF require a heatsink in typical automotive applications?

A dedicated heatsink is not required if mounted on ≥6 cm² of 1 oz. FR4 copper with tin plating. With that layout, R_th(j-a) = 62 K/W enables 2 W continuous dissipation at ≤75 °C ambient. For >2 W or confined spaces, forced air or thermal vias to inner layers are recommended.

How does the dual-collector configuration affect PCB layout?

Pins 2 and 4 must be routed to the same high-current net and soldered to overlapping or adjacent copper pours totaling ≥6 cm². Splitting them across separate traces or pads degrades thermal performance and risks exceeding R_CE(sat) specs. The footprint in Figure 8 (reflow) mandates shared solder land geometry for both collectors.

PBSS5540Z-QF Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 5 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:: 1.35 W

Frequency - Transition:: 120MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

PBSS5540Z-QF FAQ

1.How can I place an order for PBSS5540Z-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS5540Z-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 PBSS5540Z-QF reliable?

The price and inventory of PBSS5540Z-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS5540Z-QF is usually 5 days.

3.What payment methods are accepted for PBSS5540Z-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS5540Z-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS5540Z-QF?

PBSS5540Z-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS5540Z-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 PBSS5540Z-QF?

For technical support, including PBSS5540Z-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS5540Z-QF requirements.

6.How does Aetrix verify that PBSS5540Z-QF is sourced from the original manufacturer or authorized distributors?

All PBSS5540Z-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 PBSS5540Z-QF meets industry standards.

7.What is the process for return or replacement of PBSS5540Z-QF?

All PBSS5540Z-QF units undergo pre-shipment inspection (PSI). If there is an issue with PBSS5540Z-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 PBSS5540Z-QF part is unused and in its original packaging.

Return procedure for PBSS5540Z-QF:

1.Submit a request within 90 days.

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

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