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

Nexperia USA Inc. PBHV8540X-QX

Name: PBHV8540X-QX
Brand: Nexperia USA Inc.
SKU: PBHV8540X-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBHV8540X-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBHV8540X-QX.pdf

Description:: TRANS NPN 400V 0.5A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:792

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Product details

Overview

PBHV8540X-QX from Nexperia is an AEC-Q101-qualified NPN high-voltage bipolar transistor in SOT89 package, designed for automotive and industrial switching applications requiring 500 V V_CE_SM, 0.5 A continuous I_C, and low 100 mV typical V_CEsat at I_C = 100 mA / I_B = 10 mA. It serves as a high-voltage switch in LED chain drivers, LCD backlighting, and telecom hook switches.

For engineers reviewing the PBHV8540X-QX datasheet, PBHV8540X-QX pinout, PBHV8540X-QX application, or PBHV8540X-QX equivalent, this page delivers verified electrical parameters, thermal derating curves, automotive qualification status, and real-world use cases aligned with AEC-Q101 stress testing and SOT89 PCB layout guidelines.

Technical Context

This device operates as a medium-power NPN switch optimized for high-voltage DC-DC and SMPS topologies where low saturation voltage reduces conduction loss at elevated collector-emitter voltages. Its h_FE of 100–200 at I_C = 50 mA and V_CE = 10 V enables stable base drive design across -55 °C to 150 °C junction temperature range.

Thermal performance is defined by R_th(j-a) = 240 K/W (standard FR4) and 83 K/W (enhanced pad), supporting 1.5 W P_tot at T_amb ≤ 25 °C with collector pad area ≥ 6 cm². Switching times - t_d = 50 ns, t_r = 6.2 µs, t_f = 2.2 µs - reflect its suitability for <100 kHz hard-switched applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CE_SM	500 V peak - supports surge-tolerant operation in 400 V DC bus systems without clamping
I_C (continuous)	0.5 A - enables direct driving of medium-current loads like LED strings or relay coils
V_CEsat (typ)	100 mV at I_C = 100 mA / I_B = 10 mA - minimizes power dissipation in linear or saturated switching modes
h_FE	100–200 at V_CE = 10 V, I_C = 50 mA - ensures predictable base current sizing for robust turn-on margin
T_j max	150 °C - qualified for under-hood automotive environments with full derating above 75 °C ambient
AEC-Q101	Qualified - meets stress test requirements for automotive discrete semiconductors including HTGB, HTRB, and ESD

Pinout & Package

SOT89 (SC-62) plastic surface-mounted package: 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body. Collector tab is electrically connected to Pin 2 and thermally exposed for PCB heat sinking.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Low-impedance return path; connects directly to ground or low-side reference in common-emitter configurations
2	Collector	High-voltage output node; soldered to large copper area for thermal management and current handling
3	Base	Current-controlled input; requires series resistor to limit I_B to ≤200 mA peak per absolute maximum rating

Key Features

Feature	Design Value
High-voltage blocking	500 V V_CE_SM enables use in 400 V nominal DC systems with 25% safety margin
Low V_CEsat	100 mV typical at I_C = 100 mA reduces conduction loss by >40% vs. standard HV transistors
Automotive qualification	AEC-Q101 certified - validated for temperature cycling, humidity bias, and mechanical shock in automotive ECUs
Thermal efficiency	R_th(j-sp) = 20 K/W to solder point allows >1 W dissipation on standard FR4 with minimal heatsinking

Applications

LED Chain Module Driver

LCD Backlighting

Use Scenario: Driving 12–24 V LED chains in automotive interior lighting with PWM dimming.

IC Role / Device Role / Timing Role: High-side or low-side constant-current switch controlling LED string current via base-driven saturation.

Use Value: Low 100 mV V_CEsat preserves >98% of supply voltage across LED load, minimizing thermal load on driver PCB.

Use Scenario: Boost converter primary-side switch in CCFL or LED backlight inverters for automotive displays.

IC Role / Device Role / Timing Role: Medium-frequency (20–100 kHz) hard-switched transistor in flyback or forward topology primary switch.

Use Value: 500 V V_CE_SM withstands reflected voltage spikes during MOSFET gate drive transitions in isolated converters.

Automotive Motor Management

Wired Telecom Hook Switch

Use Scenario: Controlling small brushed DC motors in seat adjusters, mirror actuators, or HVAC dampers.

IC Role / Device Role / Timing Role: Low-duty-cycle saturated switch enabling bidirectional control when paired with H-bridge logic.

Use Value: 150 °C T_j max and AEC-Q101 qualification ensure reliability in confined under-dash enclosures with limited airflow.

Use Scenario: Ringing generator interface in PSTN line cards, switching 48–90 V AC ring signals to subscriber lines.

IC Role / Device Role / Timing Role: High-voltage analog switch isolating ringing circuitry during on-hook/off-hook state transitions.

Use Value: 400 V V_CEO and low leakage (<100 nA ICES) prevent false triggering and maintain line integrity during standby.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS12500UW3T1G	40 V lower V_CE_SM (460 V), higher V_CEsat (150 mV typ), same SOT-89 package	Not rated for 400 V DC bus applications; suitable only for 350 V max systems	Select if system voltage remains ≤350 V and cost sensitivity outweighs 50 V margin
STMicroelectronics BUJ302A	TO-92 package, 450 V V_CE_SM, 120 mV V_CEsat, no AEC-Q101 qualification	Requires through-hole assembly; lacks automotive qualification and thermal performance of SOT89	Choose only for non-automotive prototypes or legacy through-hole designs

Compared with NSS12500UW3T1G and BUJ302A, PBHV8540X-QX provides superior voltage margin, lower conduction loss, and automotive-grade reliability in a surface-mount package optimized for thermal transfer - critical for space-constrained automotive modules.

Availability

PBHV8540X-QX is available at Aetrix Electronics and suitable for LED chain module drivers, LCD backlighting circuits, and automotive motor management systems requiring stable component supply and long-term lifecycle support.

Supply support for PBHV8540X-QX 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 specializing in high-performance, energy-efficient components for automotive, industrial, and consumer markets, with leadership in bipolar transistors and ESD protection.

PBHV8540X-QX belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor family, engineered specifically for automotive power switching where reliability at elevated voltage and temperature is mandatory.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 200 mA per datasheet Table 5, but for continuous DC operation, IB must be limited to ensure junction temperature stays within 150 °C. At Tamb = 25 °C with standard FR4 layout, IB ≤ 10 mA is recommended to sustain I_C = 0.5 A while maintaining h_FE ≥ 100 and avoiding thermal runaway.

Can PBHV8540X-QX replace a MOSFET in a 400 V SMPS primary switch?

No - it is a bipolar transistor requiring sustained base current, not a voltage-controlled device. While it can handle 400 V V_CEO, its 6.2 µs rise time and 2.2 µs fall time limit efficient operation above ~50 kHz. Use only in low-frequency (<100 kHz) hard-switched or linear-regulator topologies where gate drive complexity must be avoided.

Is the collector tab electrically isolated from other pins?

No - Pin 2 (collector) is internally and externally connected to the metal tab. The tab must be routed to the collector net on PCB and cannot serve as a floating thermal pad. Solder mask must fully expose the tab area to ensure low-thermal-resistance connection to copper pour.

How does thermal derating affect power handling at 100 °C ambient?

Per Figure 1, P_tot drops to ~0.8 W at Tamb = 75 °C and ~0.4 W at Tamb = 100 °C for standard FR4 layout (R_th(j-a) = 240 K/W). To maintain 1.5 W dissipation at 100 °C ambient, the collector pad must be enlarged to 6 cm² (R_th(j-sp) = 83 K/W), reducing junction temperature rise to 125 K.

PBHV8540X-QX 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):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 60mA, 300mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 50mA, 10V

Power - Max:: 520 mW

Frequency - Transition:: 30MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBHV8540X-QX FAQ

1.How can I place an order for PBHV8540X-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for PBHV8540X-QX 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 PBHV8540X-QX reliable?

The price and inventory of PBHV8540X-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBHV8540X-QX is usually 5 days.

3.What payment methods are accepted for PBHV8540X-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBHV8540X-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBHV8540X-QX?

PBHV8540X-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBHV8540X-QX 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 PBHV8540X-QX?

For technical support, including PBHV8540X-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBHV8540X-QX requirements.

6.How does Aetrix verify that PBHV8540X-QX is sourced from the original manufacturer or authorized distributors?

All PBHV8540X-QX 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 PBHV8540X-QX meets industry standards.

7.What is the process for return or replacement of PBHV8540X-QX?

All PBHV8540X-QX units undergo pre-shipment inspection (PSI). If there is an issue with PBHV8540X-QX, 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 PBHV8540X-QX part is unused and in its original packaging.

Return procedure for PBHV8540X-QX:

1.Submit a request within 90 days.

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

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