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

Nexperia USA Inc. BCP51-10-QX

Name: BCP51-10-QX
Brand: Nexperia USA Inc.
SKU: BCP51-10-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCP51-10-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BCP51-10-QX.pdf

Description:: TRANS PNP 45V 1A SOT-223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BCP51-10-QX from Nexperia is a PNP medium-power bipolar junction transistor in SOT223 (SC-73) package, rated for −45 V V_CEO, −1 A continuous collector current, and 1.35 W power dissipation with 6 cm² copper pad. It delivers h_FE = 63–160 at V_CE = −2 V and I_C = −150 mA, and is AEC-Q101 qualified for automotive high-side switches and linear regulators.

For engineers reviewing the BCP51-10-QX datasheet, BCP51-10-QX pinout, BCP51-10-QX application, or BCP51-10-QX equivalent, this page provides verified electrical parameters, thermal derating curves, junction-to-ambient resistance values under three PCB mounting conditions, and validated alternatives for PNP switching and amplification roles in battery-powered and automotive systems.

Technical Context

This transistor operates as a medium-power PNP switch or linear amplifier with fixed-emitter biasing topology. Its design supports stable DC gain across −55 °C to +150 °C ambient, with base-emitter voltage of −1.0 V typical at I_C = −500 mA and V_CE = −2 V.

Thermal performance is defined by three R_th(j-a) values: 192 K/W (standard footprint), 125 K/W (1 cm² collector pad), and 93 K/W (6 cm² collector pad). Transient thermal impedance data confirms suitability for pulsed loads up to 2 A peak with ≤300 μs pulse width and ≤2% duty cycle.

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 (continuous)	−1 A - Continuous DC collector current rating; supports load switching up to ~12 W at 12 V with adequate heatsinking.
h_FE	63–160 - DC current gain range at V_CE = −2 V, I_C = −150 mA; enables predictable base drive sizing for saturation in switching applications.
P_tot	1.35 W - Max power dissipation with 6 cm² copper pad; requires ≥6 cm² FR4 copper area for full-rated operation at T_amb ≤25 °C.
f_T	145 MHz - Transition frequency at V_CE = −5 V, I_C = −50 mA; supports low-noise pre-amplification up to mid-VHF band.
V_CE(sat)	−0.5 V max at I_C = −500 mA, I_B = −50 mA; ensures <1.5 W conduction loss in saturated high-side switch configurations.
R_th(j-a)	93 K/W - Junction-to-ambient thermal resistance with 6 cm² collector pad; enables ~14.5 °C/W effective rise per watt at full 1.35 W load.

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with 4 leads, 2.3 mm pitch, and 6.5 mm × 3.5 mm × 1.65 mm body dimensions. The exposed collector tab (pins 2 and 4) serves as primary thermal path and must be soldered to ≥6 cm² copper area for rated power handling.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input requiring −50 mA base current for full saturation at −500 mA collector load; high-impedance node in linear mode.
2	Collector	Main power terminal; electrically and thermally connected to pin 4; must be routed to ground or low-impedance return for high-side configuration.
3	Emiter	Output/load connection point; tied to supply rail in high-side switch; defines common reference for base drive circuitry.
4	Collector	Duplicate collector terminal for enhanced thermal and current-carrying capacity; must be soldered to same copper pour as pin 2.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive underhood use per stress test standard; supports 15-year service life in temperature-cycled environments.
Three h_FE variants	BCP51-10-QX offers mid-range gain (63–160); enables consistent switching thresholds across production batches without recalibration.
High power dissipation	1.35 W rating with 6 cm² copper pad exceeds most SOT223 competitors; eliminates need for discrete heatsinks in space-constrained modules.
Low V_CE(sat)	≤−0.5 V at I_C/I_B = 10 reduces conduction loss by >30% vs. legacy PNP transistors in 12 V battery management circuits.
Thermally optimized package	Dual-collector-pin SOT223 layout lowers thermal resistance by 25% vs. standard 3-pin variant; improves reliability under sustained load.

Applications

Linear Voltage Regulators

High-Side Switches

Use Scenario: Adjustable LDO output stage in automotive body control modules requiring ±2% output stability over −40 °C to +125 °C.

IC Role / Device Role / Timing Role: Pass transistor controlling current flow from input to regulated output; base driven by error amplifier feedback loop.

Use Value: Low V_CE(sat) minimizes dropout voltage; high h_FE reduces base drive power; AEC-Q101 ensures long-term parametric stability.

Use Scenario: 12 V battery disconnect switch in ADAS domain controller, activated during sleep mode to isolate non-critical subsystems.

IC Role / Device Role / Timing Role: High-side PNP switch enabling reverse-polarity protection and controlled power ramp-up via base resistor network.

Use Value: −45 V V_CEO withstands load-dump transients; dual-collector pins sustain 2 A surge; thermal robustness prevents thermal runaway during fault events.

Battery-Driven Devices

MOSFET Drivers

Use Scenario: Power enable circuit for portable medical monitors powered by Li-ion packs, requiring low quiescent current and fast turn-off.

IC Role / Device Role / Timing Role: Main power gate for system-on-chip supply rail; biased into active region for soft-start control during wake-up sequences.

Use Value: h_FE consistency ensures repeatable turn-on delay; −5 V V_EBO rating protects against reverse-battery insertion; SOT223 footprint simplifies layout in compact PCBs.

Use Scenario: Level-shifting driver stage for N-channel high-side MOSFET in 48 V telecom DC-DC converter, operating at 200 kHz switching frequency.

IC Role / Device Role / Timing Role: Fast-switching PNP pull-down element in complementary emitter-follower gate driver topology.

Use Value: 145 MHz f_T supports clean 200 kHz square-wave edges; low C_c (15 pF) minimizes Miller effect; dual collector pins reduce switching losses via lower R_DS(on) equivalent.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCP52-10-QX	−60 V V_CEO, same h_FE range, identical SOT223 package and pinout	Higher voltage blocking required in 48 V industrial systems or load-dump tolerant designs	Select when system transient protection exceeds −45 V or when future-proofing for higher bus voltages
ZTX788B	−60 V V_CEO, h_FE = 100–300, TO-92 package, no AEC-Q101 qualification	Non-automotive consumer/industrial use where cost and through-hole assembly dominate	Choose only for non-automotive prototypes or cost-sensitive low-volume builds without thermal or reliability constraints

Compared with BCP52-10-QX, the BCP51-10-QX trades 15 V lower breakdown for tighter thermal resistance and automotive qualification; versus ZTX788B, it sacrifices gain flexibility and package compatibility for guaranteed AEC-Q101 compliance and superior power density in SMT layouts.

Availability

BCP51-10-QX is available at Aetrix Electronics and suitable for automotive body electronics, battery management systems, and industrial power supplies requiring stable component supply, AEC-Q101 traceability, and SOT223 thermal performance.

Supply support for BCP51-10-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 focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.

The BCP51-Q series belongs to Nexperia's AEC-Q101-qualified medium-power transistor portfolio, engineered specifically for high-reliability linear regulation, high-side switching, and MOSFET driving in harsh-temperature automotive environments.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current is −0.3 A per datasheet limiting values. For reliable continuous operation, keep I_B ≤ −50 mA when driving −500 mA collector current to maintain V_CE(sat) ≤ −0.5 V and avoid thermal overstress at T_amb = 25 °C with 6 cm² copper pad.

Can BCP51-10-QX replace BCP51-16-Q in existing designs?

Yes, but with reduced h_FE margin: BCP51-10-QX has h_FE = 63–160 versus 100–250 for BCP51-16-Q at V_CE = −2 V and I_C = −150 mA. Recalculate base drive to ensure saturation under worst-case low-gain corner; verify thermal rise remains within 150 °C junction limit.

Is the SOT223 footprint compatible with standard reflow profiles?

Yes - Nexperia specifies JEDEC J-STD-020-compliant reflow profiles for SC-73. Peak temperature must not exceed 260 °C for ≤30 seconds, with ramp rates ≤3 °C/s pre-peak. Figure 10 in the datasheet provides exact solder land dimensions and paste volume recommendations for optimal thermal pad wetting.

Does the dual-collector configuration require external connection between pins 2 and 4?

Yes - pins 2 and 4 are internally connected to the same collector region and must be externally shorted on the PCB using a shared copper pour. Leaving them unconnected degrades thermal resistance by >30% and risks current imbalance, exceeding R_th(j-a) limits and causing premature failure at rated power.

BCP51-10-QX 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):: 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:: 650 mW

Frequency - Transition:: 145MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

BCP51-10-QX FAQ

1.How can I place an order for BCP51-10-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BCP51-10-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 BCP51-10-QX reliable?

The price and inventory of BCP51-10-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCP51-10-QX is usually 5 days.

3.What payment methods are accepted for BCP51-10-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCP51-10-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCP51-10-QX?

BCP51-10-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCP51-10-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 BCP51-10-QX?

For technical support, including BCP51-10-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCP51-10-QX requirements.

6.How does Aetrix verify that BCP51-10-QX is sourced from the original manufacturer or authorized distributors?

All BCP51-10-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 BCP51-10-QX meets industry standards.

7.What is the process for return or replacement of BCP51-10-QX?

All BCP51-10-QX units undergo pre-shipment inspection (PSI). If there is an issue with BCP51-10-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 BCP51-10-QX part is unused and in its original packaging.

Return procedure for BCP51-10-QX:

1.Submit a request within 90 days.

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

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