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

Nexperia USA Inc. BCX51-10-QF

Name: BCX51-10-QF
Brand: Nexperia USA Inc.
SKU: BCX51-10-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX51-10-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BCX51-10-QF.pdf

Description:: TRANS PNP 45V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:4,000

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Product details

Overview

BCX51-10-QF from Nexperia is a PNP medium power transistor in SOT89 package, rated for −45 V V_CEO, −1 A continuous collector current, and 160 h_FE (at V_CE = −2 V, I_C = −150 mA), designed for high-side switching and linear voltage regulation in automotive-grade power management circuits.

For engineers reviewing the BCX51-10-QF datasheet, BCX51-10-QF pinout, BCX51-10-QF application, or BCX51-10-QF equivalent, this device is selected for thermally demanding, AEC-Q101-qualified designs requiring stable DC current gain across −55 °C to +150 °C ambient and robust pulsed operation up to 2 A peak collector current.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration in linear and switching modes. Its design supports base-driven saturation at I_C/I_B = 10, delivering V_CE(sat) ≤ −0.5 V at −500 mA/−50 mA, and exhibits f_T = 145 MHz for moderate-frequency amplification tasks.

Thermal performance is defined by three mounting conditions: R_th(j-a) = 250 K/W (standard footprint), 132 K/W (1 cm² collector pad), and 93 K/W (6 cm² pad), enabling precise thermal margining in PCB-constrained automotive modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - Maximum safe collector-emitter voltage with open base; defines high-side switch blocking capability in 24 V automotive systems.
I_C	−1 A - Continuous DC collector current rating; supports sustained load switching in battery-powered regulators and MOSFET drivers.
h_FE	63–160 - DC current gain range at V_CE = −2 V, I_C = −150 mA; ensures predictable base drive sizing across production lots.
P_tot	1.35 W - Max power dissipation with 6 cm² copper pad; enables compact thermal design without external heatsink in space-limited ECUs.
f_T	145 MHz - Transition frequency at V_CE = −5 V, I_C = −50 mA; supports audio-frequency amplification and fast-switching control loops.
C_c	15 pF - Collector capacitance at V_CB = −10 V, f = 1 MHz; limits high-frequency Miller effect in switching applications.

Pinout & Package

SOT89 (SC-62) flat-lead surface-mount package with exposed collector tab for thermal and electrical conduction; 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, and integrated heatsink pad on lead 2.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current sink node; connected to system ground or higher-potential rail depending on high-side vs. low-side topology.
2	Collector	Main power output terminal; electrically and thermally coupled to PCB copper pour via exposed metal tab.
3	Base	Control input; requires current-limited drive (≤ −0.3 A peak) to ensure reliable saturation without overdrive stress.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive underhood environments per stress test standard; eliminates need for additional qualification effort in Tier-1 designs.
Exposed collector tab	Direct thermal path to PCB reduces R_th(j-a) by up to 63% versus standard SOT89 footprint-critical for 1.35 W operation in confined layouts.
Three h_FE bins	BCX51-10-Q (63–160), BCX51-16-Q (100–250), BCX51-Q (63–250); enables precise gain matching in parallel-output or feedback-critical circuits.
−55 °C to +150 °C operation	Full parametric performance guaranteed across full automotive temperature range; no derating required for cold-cranking or engine-bay thermal transients.

Applications

Linear Voltage Regulators

High-Side Switches

Use Scenario: Adjustable 5 V/3.3 V linear regulator in automotive body control module with 1 A load.

IC Role / Device Role / Timing Role: Pass transistor controlling output voltage via emitter-follower configuration with feedback to base.

Use Value: Delivers low-noise, ripple-free output with <100 nA I_CBO leakage ensuring stable quiescent current during sleep mode.

Use Scenario: 12 V battery disconnect switch for infotainment head unit power domain.

IC Role / Device Role / Timing Role: High-side PNP switch enabling controlled power-up/down sequencing with base pull-up resistor network.

Use Value: −45 V V_CEO withstands load-dump transients; 2 A I_CM handles inrush without secondary protection.

Battery-Driven Devices

MOSFET Drivers

Use Scenario: Power enable circuit for portable diagnostic tool powered by Li-ion pack (8.4 V max).

IC Role / Device Role / Timing Role: Low-quiescent-current PNP switch isolating downstream DC/DC converters during standby.

Use Value: −5 V V_EBO rating allows direct connection to microcontroller GPIO; 100 nA I_EBO minimizes battery drain over months of storage.

Use Scenario: Level-shifting driver stage for N-channel high-side MOSFET in 48 V mild-hybrid starter-generator controller.

IC Role / Device Role / Timing Role: Complementary PNP transistor providing fast turn-off current sink for MOSFET gate discharge.

Use Value: 145 MHz f_T ensures sub-100 ns gate discharge; −0.5 V V_CE(sat) at 500 mA maintains low driver loss during PWM operation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCX51-16-Q	Higher h_FE bin (100–250 vs. 63–160); identical V_CEO, I_C, package, and thermal specs.	Better suited for low-base-drive applications like microcontroller-driven switches where I_B < 5 mA is required.	Select when tighter gain control or reduced base drive power is prioritized over cost-sensitive high-volume use.
ZTX753	TO-92 package, −60 V V_CEO, −1 A I_C, h_FE = 100–800; lacks AEC-Q101 qualification and SOT89 thermal performance.	Used in non-automotive industrial controls where board space is less constrained and qualification is not mandated.	Choose only for legacy through-hole designs or non-automotive prototypes; not suitable for production automotive PCBs.

Compared with BCX51-10-QF, BCX51-16-Q offers higher gain for lower base drive but same thermal envelope, while ZTX753 trades automotive qualification and SMT thermal efficiency for wider voltage margin and through-hole compatibility-making BCX51-10-QF optimal for AEC-Q101-compliant, space-constrained SMT power stages.

Availability

BCX51-10-QF is available at Aetrix Electronics and suitable for automotive body electronics, battery management systems, and industrial power regulators requiring stable component supply with AEC-Q101 compliance and SOT89 thermal performance.

Supply support for BCX51-10-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.

BCX51-Q series belongs to Nexperia's AEC-Q101-qualified medium-power bipolar transistor product line, engineered specifically for thermally demanding automotive power control and regulation functions.

FAQ

Is BCX51-10-QF suitable for high-frequency switching above 1 MHz?

Yes-its 145 MHz transition frequency (f_T) and 15 pF collector capacitance support reliable operation up to ~10 MHz in optimized gate-drive or signal-amplification roles. However, for hard-switching above 500 kHz, parasitic inductance of SOT89 layout and base drive impedance must be minimized to avoid oscillation.

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current is −0.3 A, but for reliable long-term operation, Nexperia specifies −50 mA as the recommended maximum for saturation at I_C = −500 mA (I_C/I_B = 10). Exceeding −50 mA continuously increases junction temperature and accelerates degradation.

How does the exposed collector tab affect PCB layout requirements?

The exposed collector (pin 2) must be soldered directly to ≥1 cm² of copper on the top layer, preferably with thermal vias to inner ground planes. Standard SOT89 footprints without extended pad reduce P_tot from 1.35 W to 0.50 W-layout must follow Nexperia's Fig. 10 reflow footprint to achieve rated thermal performance.

Can BCX51-10-QF replace BCX51-16-Q in an existing design?

Yes, pin-for-pin and package-compatible, but h_FE is lower (63–160 vs. 100–250), so base drive current may need increase by ~30–50% to maintain same saturation voltage. Verify V_CE(sat) and thermal rise under worst-case load before substitution.

BCX51-10-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):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 45 V

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 63 @ 150mA, 2V

Power - Max:: 500 mW

Frequency - Transition:: 145MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BCX51-10-QF FAQ

1.How can I place an order for BCX51-10-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX51-10-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 BCX51-10-QF reliable?

The price and inventory of BCX51-10-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX51-10-QF is usually 5 days.

3.What payment methods are accepted for BCX51-10-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX51-10-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX51-10-QF?

BCX51-10-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX51-10-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 BCX51-10-QF?

For technical support, including BCX51-10-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX51-10-QF requirements.

6.How does Aetrix verify that BCX51-10-QF is sourced from the original manufacturer or authorized distributors?

All BCX51-10-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 BCX51-10-QF meets industry standards.

7.What is the process for return or replacement of BCX51-10-QF?

All BCX51-10-QF units undergo pre-shipment inspection (PSI). If there is an issue with BCX51-10-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 BCX51-10-QF part is unused and in its original packaging.

Return procedure for BCX51-10-QF:

1.Submit a request within 90 days.

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

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