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

Nexperia USA Inc. BCX54Z

Name: BCX54Z
Brand: Nexperia USA Inc.
SKU: BCX54Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX54Z

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BCX54Z.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:475

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Product details

Overview

BCX54 from Nexperia is an NPN medium power transistor in SOT89 (SC-62) package, rated for 45 V V_CEO, 1 A continuous collector current, and 1.35 W total power dissipation on 6 cm² copper pad - used as low-side switch or MOSFET driver in battery-powered DC-DC regulators.

For engineers reviewing the BCX54 datasheet, BCX54 pinout, BCX54 application, or BCX54 equivalent, this page delivers verified electrical specs, thermal derating behavior, h_FE binning options (BCX54/BCX54-10/BCX54-16), and real-world switching use cases in linear regulators and power management stages.

Technical Context

The BCX54 operates as a silicon NPN bipolar junction transistor with fixed-emitter configuration, optimized for medium-power linear and switching applications where base-driven control and moderate gain stability are required. Its 45 V V_CEO rating supports operation across 24 V industrial rails and 36 V automotive auxiliary systems.

Thermal performance is defined by three mounting conditions: standard SOT89 footprint (250 K/W R_th(j-a)), 1 cm² collector pad (132 K/W), and 6 cm² pad (93 K/W). Transient thermal impedance curves confirm robust pulsed-current capability up to 2 A (tp ≤ 1 ms).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage before breakdown; enables use in 24 V systems with margin.
I_C	1 A continuous - Sustained load current capability at T_amb ≤ 25 °C with adequate PCB copper area.
h_FE	63–250 (BCX54); 100–250 (BCX54-16) - Gain binning allows predictable base drive sizing across production lots.
V_CE(sat)	≤ 0.5 V @ I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes conduction loss in switching mode.
f_T	100–180 MHz - Sufficient for audio amplification and <100 kHz PWM switching with stable gain.
P_tot	1.35 W @ T_amb = 25 °C with 6 cm² copper pad - Defines maximum steady-state power handling under optimized layout.
R_th(j-a)	93 K/W - Thermal resistance when mounted on FR4 PCB with 6 cm² collector pad; critical for thermal design validation.

Pinout & Package

SOT89 (SC-62) plastic surface-mounted package with exposed die pad for enhanced heat transfer; 3-pin flat-lead outline measuring 4.6 mm × 2.6 mm × 1.8 mm (L × W × H), lead pitch 1.5 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter (E)	Current return path; connected to ground or low-side reference; forms primary current loop with collector.
2	Collector (C)	High-current output node; soldered to large copper area for thermal management; ties to load or MOSFET gate.
3	Base (B)	Control input; requires current-limited drive (≤300 mA peak) to avoid saturation delay or thermal overstress.

Key Features

Feature	Design Value
Three h_FE bins	BCX54 (63–250), BCX54-10 (63–160), BCX54-16 (100–250) - Enables precise base resistor selection without gain margin overdesign.
Exposed collector pad	Integral thermal path to PCB copper - reduces junction-to-ambient resistance by up to 63% vs. standard SOT89 footprint.
Peak pulse current	2 A (tp ≤ 1 ms) - Supports short-duration surge loads like motor startup or capacitor charging without device failure.
Low V_BE	≤ 1 V @ I_C = 500 mA - Reduces base drive voltage headroom requirement in 3.3 V or 5 V logic-controlled circuits.
Robust ESD rating	HBM ≥ 8 kV - Ensures handling survivability during assembly and board-level testing without added protection circuitry.

Applications

Linear Voltage Regulators

MOSFET Drivers

Use Scenario: Pass transistor in adjustable LDOs delivering up to 1 A at 5–12 V output.

IC Role / Device Role / Timing Role: NPN series pass element controlled by error amplifier feedback loop.

Use Value: 0.5 V V_CE(sat) limits dropout voltage; 1.35 W P_tot supports full-load thermal operation with minimal heatsinking.

Use Scenario: Gate driver stage for N-channel power MOSFETs in buck converters or motor H-bridges.

IC Role / Device Role / Timing Role: Medium-current buffer amplifying microcontroller GPIO to deliver ≥50 mA peak gate charge current.

Use Value: 180 MHz f_T ensures fast turn-on/turn-off; 2 A I_CM handles gate charge surges without saturation.

Low-Side Switches

Battery-Driven Devices

Use Scenario: Load switch controlling solenoids, relays, or LED strings in industrial control panels.

IC Role / Device Role / Timing Role: High-side referenced but emitter-grounded switching element with base current limiting.

Use Value: 45 V V_CEO accommodates 24 V nominal supplies with transient margin; 1 A I_C covers typical 12–24 V actuator loads.

Use Scenario: Power-path control in portable medical monitors, handheld test equipment, and rechargeable tools.

IC Role / Device Role / Timing Role: Reverse-polarity protection or battery disconnect switch in main power rail.

Use Value: 5 V V_EBO rating prevents damage from accidental reverse connection; SOT89 footprint saves board space vs. TO-220 alternatives.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCP54	Same SOT89 package, identical V_CEO/I_C, but h_FE range 63–250 only (no -10/-16 variants); lower f_T (100 MHz typ).	Lacks gain binning flexibility; suitable where single-gain design suffices and RF response is non-critical.	Select BCP54 if gain tolerance is wide and cost optimization is prioritized over thermal or frequency margin.
ZTX653	TO-92 package, higher V_CEO (60 V), same I_C (1 A), but no exposed pad; R_th(j-a) ≈ 200 K/W (vs. 93 K/W for BCX54 on 6 cm²).	Requires external heatsink above ~300 mA; unsuitable for compact SMT layouts needing high power density.	Choose ZTX653 only for through-hole legacy designs or where 60 V rating justifies thermal penalty and larger footprint.

Compared with BCP54 and ZTX653, BCX54 offers superior thermal performance via its exposed collector pad, gain binning for precision biasing, and higher f_T - making it optimal for space-constrained, thermally demanding, or high-speed switching applications.

Availability

BCX54 is available at Aetrix Electronics and suitable for linear voltage regulators, MOSFET drivers, and low-side switches requiring stable component supply across industrial, medical, and portable electronics programs.

Supply support for BCX54 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 BCX54 belongs to Nexperia's medium-power bipolar transistor product line, engineered for robust DC and switching operation in power management, regulation, and interface circuits where thermal efficiency and gain consistency are critical.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current (I_B) is 0.3 A per datasheet limiting values. For reliable long-term operation, keep continuous I_B ≤ 50 mA - sufficient to drive 1 A collector current at h_FE = 20, well within BCX54-16's 100–250 gain range. Exceeding 0.3 A risks metallization failure or bond wire lift.

Can BCX54 replace BC54 in existing designs?

No - BC54 uses TO-92 package with different thermal and mechanical characteristics. BCX54's SOT89 footprint, exposed collector pad, and 93 K/W R_th(j-a) (6 cm² pad) require PCB layout changes. Electrical parameters align closely (45 V, 1 A), but thermal design must be revalidated due to differing package physics and solder joint geometry.

How does ambient temperature affect maximum collector current?

At T_amb = 75 °C, the derated I_C drops to ~0.7 A (per Fig. 1 power derating curve for 6 cm² pad). The 1 A rating applies only at T_amb ≤ 25 °C. Above 25 °C, linear derating begins at −8.3 mA/°C, reaching zero at ~150 °C junction temperature - consistent with 150 °C T_j(max) limit.

Is BCX54 qualified for automotive applications?

No - the datasheet explicitly states this part is non-automotive qualified (Rev. 10 revision history). It lacks AEC-Q101 stress testing and automotive-grade process controls. For automotive use, Nexperia recommends the automotive-qualified BCP54-Q or BCX54-Q series, which include extended temperature screening and PPAP documentation.

BCX54Z 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):: 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:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BCX54Z FAQ

1.How can I place an order for BCX54Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX54Z 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 BCX54Z reliable?

The price and inventory of BCX54Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX54Z is usually 5 days.

3.What payment methods are accepted for BCX54Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX54Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX54Z?

BCX54Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX54Z 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 BCX54Z?

For technical support, including BCX54Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX54Z requirements.

6.How does Aetrix verify that BCX54Z is sourced from the original manufacturer or authorized distributors?

All BCX54Z 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 BCX54Z meets industry standards.

7.What is the process for return or replacement of BCX54Z?

All BCX54Z units undergo pre-shipment inspection (PSI). If there is an issue with BCX54Z, 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 BCX54Z part is unused and in its original packaging.

Return procedure for BCX54Z:

1.Submit a request within 90 days.

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

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