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

Nexperia USA Inc. PBSS4540X,135

Name: PBSS4540X,135
Brand: Nexperia USA Inc.
SKU: PBSS4540X,135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS4540X,135

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBSS4540X,135.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PBSS4540X from Nexperia is a 40 V, 5 A NPN low-V_CEsat transistor in SOT89 package, designed as a high-efficiency medium-power switch for DC-DC converters, motor drivers, and strobe flash circuits. It delivers R_CEsat = 40–71 mΩ at I_C = 5 A / I_B = 500 mA, h_FE ≥ 100 at full load, and operates up to T_j = 150 °C.

For engineers reviewing the PBSS4540X datasheet, PBSS4540X pinout, PBSS4540X application, or PBSS4540X equivalent, this device is selected for high-current switching where thermal efficiency, low conduction loss, and SMT-compatible footprint are critical - especially in space-constrained power stages of portable electronics and industrial peripherals.

Technical Context

This NPN bipolar junction transistor uses optimized epitaxial base design to achieve low saturation voltage while sustaining 4 A continuous collector current and 10 A pulsed peak. Its V_CEO = 40 V and V_CB0 = 40 V rating support operation in 24 V and 36 V systems with margin.

The device exhibits h_FE ≥ 100 at I_C = 5 A (pulsed), enabling efficient drive with modest base current (I_B = 500 mA), and features R_CEsat as low as 40 mΩ - directly reducing I²R losses and PCB heating in high-duty-cycle applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage with base open; enables use in 24 V bus systems with transient headroom.
I_C (continuous)	4 A - Continuous collector current rating at T_amb ≤ 25 °C on standard FR4; defines steady-state power stage capacity.
R_CEsat	40–71 mΩ - Equivalent on-resistance at I_C = 5 A / I_B = 500 mA; determines conduction loss and thermal rise in switching mode.
h_FE	≥100 - DC current gain at I_C = 5 A / V_CE = 2 V; ensures reliable saturation with practical base drive circuitry.
V_CEsat	≤355 mV - Collector-emitter saturation voltage at I_C = 5 A / I_B = 500 mA; directly impacts voltage drop and efficiency in linear/switching modes.
T_j max	150 °C - Maximum junction temperature; sets thermal design boundary for heatsinking and ambient derating.

Pinout & Package

SOT89 (SC-62/TO-243) plastic surface-mount package: 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body; collector tab provides thermal path to PCB copper.

Pin	Circuit Role	Design Meaning
1	E	Emitter terminal - reference node for base drive and current return; connected to ground or low-side return path.
2	C	Collector terminal - high-current output node; electrically and thermally coupled to exposed pad for heat dissipation.
3	B	Base terminal - control input requiring ~500 mA pulsed drive to fully saturate at 5 A load; sensitive to ESD.

Key Features

Feature	Design Value
Low R_CEsat	40 mΩ typical at 5 A - reduces conduction loss by >30% vs. standard BJT alternatives, lowering thermal stress in compact layouts.
High h_FE at full load	≥100 at I_C = 5 A - allows direct microcontroller GPIO drive (with buffer) or minimal external base driver complexity.
Thermal robustness	R_th(j-a) = 80 K/W on ceramic PCB - supports stable operation up to 1.6 W dissipation with proper board layout.
Peak current capability	I_CM = 10 A (10 ms pulse) - handles inrush currents in motor start-up or capacitor charging without secondary protection.

Applications

Motor Drive Interface

Strobe Flash Control

Use Scenario: Driving 12–24 V DC brush motors in portable fans, cooling modules, or actuator subsystems.

IC Role / Device Role / Timing Role: Low-side NPN switch controlling motor current path; operates in saturated on/off mode with <1 µs turn-off delay.

Use Value: 40 mΩ R_CEsat limits voltage drop to <200 mV at 5 A, minimizing self-heating and enabling single-layer PCB thermal management.

Use Scenario: High-current pulse switching for xenon or LED strobe circuits in digital cameras and smartphones.

IC Role / Device Role / Timing Role: Fast-switching NPN transistor delivering 5 A pulses (≤10 ms) to flash capacitor discharge path.

Use Value: 10 A peak rating and 150 °C T_j limit ensure reliability during repetitive high-energy discharges without thermal runaway.

TFT Display Inverter

LAN/ADSL Power Switch

Use Scenario: Driving backlight inverters in TFT-LCD panels requiring regulated 20–40 V AC output from DC input.

IC Role / Device Role / Timing Role: Primary switching element in half-bridge or flyback topology; commutates at 20–100 kHz with low V_CEsat.

Use Value: Low 355 mV V_CEsat at full load improves conversion efficiency >92%, reducing heat in sealed display enclosures.

Use Scenario: Enabling/disabling 48 V phantom power or auxiliary bias rails in Ethernet PHY and DSL line interface units.

IC Role / Device Role / Timing Role: Medium-power series pass switch placed between supply rail and downstream PHY IC or transformer bias winding.

Use Value: 40 V V_CEO provides margin over 48 V PoE systems; 4 A rating supports dual-port LAN designs with shared power budget.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS40501MR6T1G	V_CEO = 40 V, I_C = 4 A, R_CEsat = 55–95 mΩ (typ. 55 mΩ); SOT-23 package (smaller, lower thermal mass).	Lower current rating and higher R_CEsat; suitable only for <3 A loads; limited thermal handling in sustained operation.	Select when board space is critical and peak load ≤3 A; avoid for fan/motor drivers above 2.5 A continuous.
Diodes Incorporated DXTN4020P5-13	V_CEO = 40 V, I_C = 5 A, R_CEsat = 45–80 mΩ (typ. 45 mΩ); same SOT89 package; h_FE ≥ 80 at 5 A.	Slightly lower h_FE requires stronger base drive; thermal resistance matches closely but lacks published 150 °C T_j validation.	Valid drop-in alternative for cost-sensitive designs where h_FE margin >20% is acceptable and automotive qualification not required.

Compared with NSS40501MR6T1G and DXTN4020P5-13, PBSS4540X offers superior h_FE at full load and verified 150 °C operation - making it preferred for thermally constrained, high-reliability medium-power switching where base drive simplicity and long-term stability are prioritized.

Availability

PBSS4540X is available at Aetrix Electronics and suitable for medium-power peripheral drivers, strobe flash units, TFT display inverters, and LAN/ADSL power switches requiring stable component supply across production lifecycles.

Supply support for PBSS4540X 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 advanced packaging and automotive-grade qualification.

PBSS4540X belongs to Nexperia's low-V_CEsat BJT portfolio, engineered specifically for efficiency-critical medium-power switching in consumer, industrial, and communications equipment - not automotive-qualified per v.4 revision.

FAQ

What is the maximum continuous collector current for PBSS4540X under standard PCB conditions?

The PBSS4540X supports 4 A continuous collector current when mounted on an FR4 PCB with standard footprint (single-sided copper, tin-plated), as defined in Table 5 Limiting Values. Derating applies above Tamb = 25 °C per Figure 1 - e.g., 2.5 A at 70 °C ambient with no heatsink.

Can PBSS4540X be used in automotive applications?

No. Per Revision History (v.4, October 2025), PBSS4540X is explicitly marked non-automotive qualified. It has not undergone AEC-Q101 stress testing or automotive-grade process controls. For automotive use, Nexperia recommends its -Q qualified equivalents such as PBSS4540X-Q.

What base drive current is required to fully saturate PBSS4540X at 5 A collector load?

Full saturation at I_C = 5 A requires I_B = 500 mA (pulsed, tp ≤ 300 µs, duty ≤ 2%), as specified in Table 7 Characteristics. This yields V_CEsat ≤ 355 mV and R_CEsat ≤ 71 mΩ. For DC operation, reduce I_C to 4 A and apply I_B ≥ 200 mA.

How does the SOT89 package enhance thermal performance compared to SOT23?

The SOT89 package features an exposed collector tab that serves as a primary thermal path to the PCB copper pour. With 6 cm² mounting pad, R_th(j-a) drops to 90 K/W (vs. >200 K/W for SOT23), enabling 1.4 W dissipation - critical for maintaining T_j < 150 °C in 5 A switching applications.

PBSS4540X,135 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 4 A

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

Vce Saturation (Max) @ Ib, Ic:: 355mV @ 500mA, 5A

Current - Collector Cutoff (Max):: 100nA

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

Power - Max:: 1.6 W

Frequency - Transition:: 70MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBSS4540X,135 FAQ

1.How can I place an order for PBSS4540X,135 through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS4540X,135 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 PBSS4540X,135 reliable?

The price and inventory of PBSS4540X,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS4540X,135 is usually 5 days.

3.What payment methods are accepted for PBSS4540X,135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS4540X,135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS4540X,135?

PBSS4540X,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS4540X,135 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 PBSS4540X,135?

For technical support, including PBSS4540X,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS4540X,135 requirements.

6.How does Aetrix verify that PBSS4540X,135 is sourced from the original manufacturer or authorized distributors?

All PBSS4540X,135 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 PBSS4540X,135 meets industry standards.

7.What is the process for return or replacement of PBSS4540X,135?

All PBSS4540X,135 units undergo pre-shipment inspection (PSI). If there is an issue with PBSS4540X,135, 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 PBSS4540X,135 part is unused and in its original packaging.

Return procedure for PBSS4540X,135:

1.Submit a request within 90 days.

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

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