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

Nexperia USA Inc. BCP51TF

Name: BCP51TF
Brand: Nexperia USA Inc.
SKU: BCP51TF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCP51TF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BCP51TF.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:9,430

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Product details

Overview

BCP51TF 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 1.3 W power dissipation on 4-layer PCB with 1 cm² collector pad. It delivers h_FE = 63–250 at V_CE = −2 V / I_C = −150 mA and supports high-side switch and linear regulator functions in automotive-grade power management circuits.

For engineers reviewing the BCP51TF datasheet, BCP51TF pinout, BCP51TF application, or BCP51TF equivalent, this page provides verified pin assignments, thermal derating curves, safe operating area (SOA) boundaries, AEC-Q101 qualification status, and validated alternatives for high-reliability PNP switching and amplification roles.

Technical Context

The BCP51TF operates as a silicon PNP BJT with base-controlled current amplification, optimized for medium-power linear and switching applications where robust thermal performance and automotive qualification are required. Its design supports DC and pulsed operation up to I_CM = −2 A (tp ≤ 1 ms), with V_BE ≈ −1 V and V_CE(sat) ≤ −500 mV at I_C = −500 mA / I_B = −50 mA.

Thermal behavior is defined across five mounting configurations: R_th(j-a) ranges from 70 K/W (4-layer PCB, 1 cm² collector pad) to 209 K/W (standard FR4 single-sided footprint). Transient thermal impedance data confirms suitability for repetitive pulse loads with duty cycles down to 0.02 and pulse widths ≥10 µs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - Maximum allowable collector-emitter voltage with base open; defines high-side switch blocking capability
I_C	−1 A - Continuous DC collector current rating; sets baseline load drive capacity
P_tot	1.3 W - Max power dissipation on FR4 4-layer PCB with standard footprint; determines heatsinking requirements
h_FE	63–250 - DC current gain range at V_CE = −2 V / I_C = −150 mA; enables predictable base drive sizing
f_T	100–140 MHz - Transition frequency at V_CE = −5 V / I_C = −50 mA; supports audio and low-MHz switching
V_CE(sat)	≤ −500 mV - Collector-emitter saturation voltage at I_C = −500 mA / I_B = −50 mA; ensures low conduction loss
R_th(j-a)	70 K/W - Junction-to-ambient thermal resistance on 4-layer FR4 with 1 cm² collector pad; critical for thermal design margin

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with 4 leads: lead 1 = Base, lead 2 = Collector, lead 3 = Emitter, lead 4 = Collector (dual-collector configuration for enhanced thermal and current handling).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires series resistor to limit I_B ≤ −0.2 A (DC) or −0.3 A (peak)
2	Collector	Main high-current output terminal; electrically and thermally connected to exposed copper pad
3	Emitter	Reference node for PNP operation; tied to higher potential rail in high-side switch topology
4	Collector	Second collector terminal paralleled with pin 2 to reduce thermal resistance and increase current sharing

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive underhood applications per stress test qualification for discrete semiconductors
Dual-collector SOT223 package	Leads 2 and 4 both serve as collectors, lowering effective R_th(j-a) and enabling 1.3 W dissipation
Three h_FE variants	BCP51T (63–250), BCP51-10T (63–160), BCP51-16T (100–250) - allows precise gain matching in production
High peak current capability	I_CM = −2 A (tp ≤ 1 ms) - supports surge-tolerant power sequencing and motor startup
Low V_CE(sat)	≤ −500 mV at I_C = −500 mA - minimizes conduction loss in linear regulators and active clamps

Applications

Linear Voltage Regulators

MOSFET Drivers

Use Scenario: Pass transistor in adjustable positive LDO or emitter-follower regulator delivering up to 1 A load current.

IC Role / Device Role / Timing Role: PNP pass element controlling output voltage via base bias; operates in linear region with continuous conduction.

Use Value: Low V_CE(sat) and stable h_FE ensure tight regulation accuracy and minimal dropout voltage under full load.

Use Scenario: Level-shifting and current-boosting stage driving N-channel MOSFET gates in half-bridge or high-side configurations.

IC Role / Device Role / Timing Role: Active pull-up transistor providing fast gate charging current while isolating control logic from high-voltage rail.

Use Value: Dual-collector thermal path sustains 1 A peak gate charge pulses without thermal runaway during PWM switching.

High-Side Switches

Power Management

Use Scenario: Load switch controlling 12 V/24 V automotive subsystems such as lighting, HVAC actuators, or infotainment power rails.

IC Role / Device Role / Timing Role: High-side PNP switch with emitter tied to supply rail; base driven by microcontroller GPIO through current-limiting resistor.

Use Value: −45 V V_CEO withstands load-dump transients; AEC-Q101 qualification ensures reliability in 15-year vehicle lifetimes.

Use Scenario: Current-sense amplifier front-end or battery protection circuitry in portable industrial tools and telematics modules.

IC Role / Device Role / Timing Role: Precision current mirror or shunt-based sensing element operating in active mode with calibrated h_FE tracking.

Use Value: Tight h_FE binning (63–250) and low ICBO (≤100 nA) enable sub-1% current measurement accuracy over −40 °C to +125 °C.

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
BCP52TF	Nexperia's complementary NPN device with same SOT223 package, +45 V V_CEO, +1 A I_C, but opposite polarity and gain profile	Used in push-pull output stages or NPN-based low-side switches; not interchangeable without circuit redesign	Select only when NPN topology is required; verify base drive polarity and SOA alignment
ZTX951	Diodes Incorporated PNP in SOT89 package; −60 V V_CEO, −1 A I_C, h_FE = 100–300, but R_th(j-a) = 125 K/W (higher thermal resistance)	Limited to lower-power applications due to inferior thermal performance; lacks AEC-Q101 certification	Acceptable for non-automotive consumer designs where cost outweighs thermal margin and qualification

Compared with BCP51TF, BCP52TF serves inverted topologies requiring NPN conduction, while ZTX951 trades automotive qualification and dual-collector thermal efficiency for wider V_CEO and higher h_FE in a less thermally capable package.

Availability

BCP51TF is available at Aetrix Electronics and suitable for automotive power distribution, industrial linear regulators, and high-reliability MOSFET driver circuits requiring stable component supply across multi-year production programs.

Supply support for BCP51TF 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.

The BCP51T series belongs to Nexperia's AEC-Q101-qualified medium-power transistor product line, engineered specifically for robust high-side switching, linear regulation, and power interface applications in harsh-environment systems.

FAQ

What is the maximum allowable junction temperature for BCP51TF?

The absolute maximum junction temperature (T_j) for BCP51TF is 150 °C, as defined in IEC 60134 limiting values. Operation above this threshold risks permanent parametric shift or catastrophic failure. Thermal design must ensure T_j remains below 150 °C under worst-case ambient and power dissipation conditions, using the appropriate R_th(j-a) value for the actual PCB layout.

Is BCP51TF pin-compatible with other SOT223 PNP transistors like MMBT5401?

No - BCP51TF uses a 4-pin SOT223 (SC-73) package with dual collectors (pins 2 and 4), whereas MMBT5401 is a 3-pin SOT23 device. Even among SOT223 parts, pinouts differ: BCP51TF assigns pin 1 = Base, pin 2 = Collector, pin 3 = Emitter, pin 4 = Collector; MMBT5401 equivalents use different pin mappings and lack the second collector terminal.

Does BCP51TF support pulsed operation beyond its DC ratings?

Yes - BCP51TF supports I_CM = −2 A for single pulses ≤1 ms, and safe operating area (SOA) curves confirm usable operation at −1 A up to V_CE = −20 V under pulsed conditions. Pulse width, duty cycle, and PCB thermal mass must be validated against Figures 2–7 in the datasheet to avoid secondary breakdown or thermal runaway.

How does the dual-collector configuration improve thermal performance?

The dual-collector design (pins 2 and 4) electrically parallels the collector paths and thermally connects both leads to the large exposed copper pad. This reduces total thermal resistance: R_th(j-a) drops from 209 K/W (standard footprint) to 70 K/W on a 4-layer PCB with 1 cm² collector pad, enabling 1.3 W dissipation - 117% higher than typical 3-pin SOT223 transistors under identical conditions.

BCP51TF 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:: 1.3 W

Frequency - Transition:: 140MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

BCP51TF FAQ

1.How can I place an order for BCP51TF through Aetrix?

Please submit a Request for Quotation (RFQ) for BCP51TF 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 BCP51TF reliable?

The price and inventory of BCP51TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCP51TF is usually 5 days.

3.What payment methods are accepted for BCP51TF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCP51TF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCP51TF?

BCP51TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCP51TF 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 BCP51TF?

For technical support, including BCP51TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCP51TF requirements.

6.How does Aetrix verify that BCP51TF is sourced from the original manufacturer or authorized distributors?

All BCP51TF 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 BCP51TF meets industry standards.

7.What is the process for return or replacement of BCP51TF?

All BCP51TF units undergo pre-shipment inspection (PSI). If there is an issue with BCP51TF, 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 BCP51TF part is unused and in its original packaging.

Return procedure for BCP51TF:

1.Submit a request within 90 days.

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

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