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

Nexperia USA Inc. BCX56TX

Name: BCX56TX
Brand: Nexperia USA Inc.
SKU: BCX56TX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX56TX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BCX56TX.pdf

Description:: TRANS NPN 80V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:27,105

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Product details

Overview

BCX56TX from Nexperia is an AEC-Q101 qualified NPN power bipolar transistor in SOT89 (SC-62) package, rated for 80 V V_CEO, 1 A continuous collector current, and 500 mW–1100 mW power dissipation depending on PCB layout. It delivers h_FE = 63–250 at I_C = 150 mA and V_CE = 2 V, with V_CE(sat) ≤ 500 mV at I_C = 500 mA / I_B = 50 mA - used in linear voltage regulators and low-side switching stages where thermal robustness and automotive-grade reliability are required.

For engineers reviewing the BCX56TX datasheet, BCX56TX pinout, BCX56TX application, or BCX56TX equivalent, this page provides verified pin configuration, real-world thermal derating behavior, AEC-Q101 qualification status, and validated alternatives for power transistor selection in automotive and industrial power management circuits.

Technical Context

This device operates as a medium-power NPN switch or linear amplifier with fixed gain binning (BCX56TX corresponds to the standard-gain variant, h_FE min 63). Its junction-to-ambient thermal resistance ranges from 114 K/W (6 cm² copper pad) to 250 K/W (standard footprint), directly impacting maximum usable DC current under ambient temperature constraints.

The transistor supports pulsed operation up to I_CM = 2 A (t_p ≤ 1 ms) and exhibits f_T = 155 MHz at V_CE = 5 V, I_C = 50 mA, enabling stable performance in high-speed switching and analog amplification up to mid-VHF range when properly biased and heatsinked.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in low-side switch or regulator output stage.
I_C (continuous)	1 A - Continuous collector current rating at T_amb = 25 °C with adequate PCB copper; derates linearly above 25 °C per Fig. 1.
h_FE	63–250 - DC current gain at V_CE = 2 V, I_C = 150 mA; enables predictable base drive sizing for saturation in switching applications.
V_CE(sat)	≤ 500 mV at I_C = 500 mA / I_B = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in power switching nodes.
P_tot	1100 mW - Max power dissipation with 6 cm² collector copper pad; determines thermal margin in linear regulator pass element use.
f_T	155 MHz - Transition frequency at V_CE = 5 V, I_C = 50 mA; confirms suitability for >10 MHz signal amplification or fast-switching control loops.

Pinout & Package

SOT89 (SC-62) plastic surface-mount package: 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, single-sided FR4 mounting. Collector tab is electrically connected to Pin 2 and serves as primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current return path; connects to ground or low-side reference; requires low-impedance trace for stability in linear regulation.
2	Collector	Main power output node; thermally coupled to PCB copper pad; must be routed with minimum trace length/width for heat spreading.
3	Base	Control input; driven by logic-level or op-amp output; requires series resistor to limit I_B ≤ 200 mA (absolute max).

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive power electronics including engine control modules and body electronics requiring extended temperature (-55 °C to +150 °C) and lifetime reliability.
Three h_FE bins	BCX56TX (63–250), BCX56-10TX (63–160), BCX56-16TX (100–250) - enables precise gain matching across production batches in feedback-critical circuits.
High P_tot scalability	1100 mW with 6 cm² copper pad - allows direct use as pass transistor in 1 A linear regulators without external heatsink.
Low V_CE(sat)	≤ 500 mV at I_C/I_B = 10 - reduces dropout voltage and improves efficiency in low-voltage, high-current switching applications.

Applications

Linear Voltage Regulators

MOSFET Drivers

Use Scenario: Pass element in adjustable 3-terminal linear regulator delivering up to 1 A at <5 V dropout.

IC Role / Device Role / Timing Role: NPN power transistor operating in linear region, dissipating excess input-output voltage as heat.

Use Value: Enables compact, low-noise regulation without external controller IC; 1100 mW P_tot supports full 1 A load at moderate ambient temperatures.

Use Scenario: Gate driver stage for N-channel MOSFETs in 12 V automotive power distribution modules.

IC Role / Device Role / Timing Role: Low-side switch providing fast turn-on/turn-off of MOSFET gate capacitance via saturated NPN action.

Use Value: 155 MHz f_T and ≤500 mV V_CE(sat) ensure sub-µs switching transitions and minimal gate drive loss.

Low-Side Switches

Power Management

Use Scenario: Load switch controlling solenoids, relays, or LED arrays in vehicle lighting systems.

IC Role / Device Role / Timing Role: Saturated NPN switch connecting load to ground under microcontroller GPIO control.

Use Value: 2 A peak current capability handles inrush surges; AEC-Q101 qualification ensures field reliability in vibration-prone environments.

Use Scenario: Current-sense amplifier front-end or bias generator in multi-rail industrial power supplies.

IC Role / Device Role / Timing Role: Precision current mirror or active load element leveraging stable h_FE and low leakage (I_CBO ≤ 100 nA).

Use Value: 5 V V_EBO and 100 V V_CBO support operation in floating or high-common-mode sensing topologies.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX653	Higher V_CEO = 100 V, lower h_FE = 100–300, same SOT89 package but non-AEC-Q101 rated.	Preferred in industrial power supplies where automotive qualification is unnecessary and higher breakdown margin is critical.	Select ZTX653 when >80 V headroom is needed and AEC-Q101 compliance is not mandated.
BCP56-16	Same family, identical h_FE bin (100–250), but TO-92 package - larger footprint, lower P_tot (625 mW), no AEC-Q101 certification.	Suitable for prototyping or low-volume consumer products where manual assembly and cost outweigh thermal performance needs.	Choose BCP56-16 only for hand-soldered evaluation; avoid in production automotive or high-reliability designs.

Compared with ZTX653 and BCP56-16, BCX56TX uniquely combines AEC-Q101 qualification, 80 V/1 A ratings, and scalable thermal performance in SOT89 - making it the only drop-in solution for volume automotive low-side switching where qualification, size, and power density are jointly constrained.

Availability

BCX56TX is available at Aetrix Electronics and suitable for linear voltage regulators, MOSFET drivers, and low-side switches requiring stable component supply across automotive Tier-1 production, industrial control system upgrades, and embedded power management redesigns.

Supply support for BCX56TX 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The BCX56T series belongs to Nexperia's AEC-Q101 qualified discrete power transistor portfolio, engineered specifically for robust, thermally efficient switching and linear regulation in harsh-environment automotive electronics.

FAQ

Is BCX56TX pin-compatible with BCX56-10TX and BCX56-16TX?

Yes - all BCX56T-series variants share identical SOT89 pinout (Emitter–Collector–Base on Pins 1–2–3), identical package dimensions, and identical absolute maximum ratings. Only DC current gain (h_FE) differs: BCX56TX = 63–250, BCX56-10TX = 63–160, BCX56-16TX = 100–250. No layout change is required when swapping within the series.

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current is 200 mA (per Table 6), but for reliable long-term operation in linear or switching modes, design should limit I_B to ≤50 mA - ensuring V_CE(sat) remains ≤500 mV and junction temperature stays below 150 °C under worst-case ambient and power dissipation conditions.

Can BCX56TX replace BCX56 in legacy through-hole designs?

No - BCX56 uses TO-92 package with different pinout (E-B-C) and lower power handling (625 mW vs. up to 1100 mW). Direct replacement requires PCB redesign for SOT89 footprint, thermal pad layout, and signal routing. Use only in new SMT-based designs or after full thermal and electrical validation.

Does BCX56TX require a heatsink in 1 A switching applications?

Not necessarily - with a 6 cm² copper pad on FR4, BCX56TX achieves R_th(j-a) = 114 K/W, allowing ~1 A continuous current at T_amb ≤ 50 °C without external heatsink. At higher ambient or sustained 1 A loads, thermal simulation using Fig. 1 derating curves is mandatory to confirm junction temperature remains <150 °C.

BCX56TX 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):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 80 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:: 155MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BCX56TX FAQ

1.How can I place an order for BCX56TX through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX56TX 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 BCX56TX reliable?

The price and inventory of BCX56TX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX56TX is usually 5 days.

3.What payment methods are accepted for BCX56TX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX56TX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX56TX?

BCX56TX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX56TX 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 BCX56TX?

For technical support, including BCX56TX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX56TX requirements.

6.How does Aetrix verify that BCX56TX is sourced from the original manufacturer or authorized distributors?

All BCX56TX 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 BCX56TX meets industry standards.

7.What is the process for return or replacement of BCX56TX?

All BCX56TX units undergo pre-shipment inspection (PSI). If there is an issue with BCX56TX, 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 BCX56TX part is unused and in its original packaging.

Return procedure for BCX56TX:

1.Submit a request within 90 days.

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

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