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

Nexperia USA Inc. BCX19,215

Name: BCX19,215
Brand: Nexperia USA Inc.
SKU: BCX19,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX19,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BCX19,215.pdf

Description:: TRANS NPN 45V 0.5A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:13,314

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Product details

Overview

BCX19,215 from Nexperia is an NPN general-purpose bipolar junction transistor in SOT23 package, rated for 45 V V_CEO, 500 mA I_C, and 250 mW P_tot, used in saturated switching and low-power amplification stages of consumer and industrial control circuits.

For engineers reviewing the BCX19,215 datasheet, BCX19,215 pinout, BCX19,215 application, or BCX19,215 equivalent, this page delivers verified DC current gain (h_FE = 100–600 at I_C = 100 mA), V_CE(sat) ≤ 620 mV, thermal resistance R_th(j-a) = 500 K/W, and SOT23 footprint compatibility for board-level redesign and BOM validation.

Technical Context

The BCX19,215 operates as a medium-current, low-voltage NPN switch with base-emitter turn-on voltage of ~1.2 V at I_C = 500 mA and V_CE = 1 V. Its f_T = 100 MHz supports audio-frequency amplification and digital signal buffering up to ~10 MHz switching.

Designed for FR4 PCB mounting, it exhibits I_CBO ≤ 100 nA at 20 V and T_j = 25 °C, with junction temperature rating up to 150 °C and storage range from −65 °C to +150 °C - enabling use in thermally constrained embedded modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - maximum collector-emitter voltage before breakdown under open-base condition; defines safe operating voltage in switching applications.
I_C (DC)	500 mA - continuous collector current capability; supports driver-stage loads such as small relays or LED arrays.
h_FE	100–600 at I_C = 100 mA - wide DC current gain range enables flexible bias design without external gain stabilization.
V_CE(sat)	≤ 620 mV at I_C = 500 mA, I_B = 50 mA - low saturation voltage minimizes power loss and self-heating in on-state switching.
R_th(j-a)	500 K/W - thermal resistance from junction to ambient on FR4 board; determines required trace area and airflow for thermal management.
f_T	100 MHz - transition frequency confirms suitability for audio amplification and fast digital logic interfacing.

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-pin, 1.3 mm × 2.9 mm footprint, 1.1 mm height, with gull-wing leads for reflow soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input terminal; requires ~50 mA base drive for full 500 mA collector conduction in saturation.
2	Emiter	Common reference node; connected to ground or low-side return path in common-emitter configurations.
3	Collector	Output current sink terminal; handles up to 500 mA DC load current with ≤620 mV drop when fully saturated.

Key Features

Feature	Design Value
High DC current capability	500 mA continuous collector current supports direct driving of small solenoids and logic-level MOSFET gates.
Low saturation voltage	V_CE(sat) ≤ 620 mV reduces conduction losses and improves efficiency in battery-powered switching circuits.
Wide h_FE range	100–600 at I_C = 100 mA allows robust bias design across process and temperature variations.
Thermal ruggedness	Junction temperature rating up to 150 °C enables operation in sealed enclosures without forced cooling.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20 mA white LEDs from 3.3 V MCU outputs via single-transistor switch.

IC Role / Device Role / Timing Role: NPN switch providing current gain and level-shifting between low-drive GPIO and higher-current LED load.

Use Value: Enables direct LED control without external driver ICs; V_CE(sat) ≤ 620 mV ensures >90% power efficiency at 20 mA.

Use Scenario: Amplifying weak sensor signals (e.g., thermistor divider) into clean 0–3.3 V analog inputs for ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage with h_FE ≥ 100 delivering stable voltage gain and impedance matching.

Use Value: Eliminates need for op-amp in cost-sensitive designs; f_T = 100 MHz ensures flat response up to 10 kHz audio band.

Relay Coil Driver

Logic-Level Translation

Use Scenario: Switching 12 V/100 mA relay coils controlled by 3.3 V microcontrollers.

IC Role / Device Role / Timing Role: Saturated NPN switch isolating low-voltage logic from inductive load; flyback diode integrated externally.

Use Value: I_C = 500 mA headroom prevents thermal runaway during coil energization; V_CEO = 45 V withstands 12 V supply transients.

Use Scenario: Converting 1.8 V logic outputs to 5 V-compatible signals for legacy peripherals.

IC Role / Device Role / Timing Role: Emitter-follower or common-emitter level shifter with base biased for rail-to-rail swing.

Use Value: Supports bidirectional translation with <10 ns propagation delay; C_c = 5 pF avoids signal integrity issues at 1 MHz clock rates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40,215	Higher h_FE (250–630), same SOT23 package, identical pinout, but V_CEO = 45 V and P_tot = 300 mW.	Better suited for low-base-drive applications; marginally higher power dissipation capability.	Select when tighter h_FE tolerance or improved thermal margin is required without layout change.
MMBT2222ALT1G	Same V_CEO (40 V), lower h_FE (100–300), higher I_C (600 mA), different pinout (Emitter-Base-Collector).	Requires PCB layout revision; better for high-speed switching due to lower C_c (8 pF vs 5 pF).	Choose only if redesign is acceptable and faster edge rates (>10 MHz) are needed.

Compared with BCX19,215, BC817-40,215 offers higher gain consistency and slightly better thermal performance in same footprint, while MMBT2222ALT1G trades pin compatibility for higher speed and current - making BCX19,215 optimal for cost-sensitive, layout-constrained general-purpose switching where moderate f_T suffices.

Availability

BCX19,215 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, relay coil driving, and logic-level translation requiring stable component supply and long-term obsolescence management.

Supply support for BCX19,215 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The BCX19,215 belongs to Nexperia's standard bipolar transistor product line, engineered for cost-effective, reliable switching and amplification in space-constrained PCBs where SOT23 footprint and proven thermal behavior are critical.

FAQ

Is BCX19,215 RoHS compliant and lead-free?

Yes, BCX19,215 is RoHS compliant and lead-free per Nexperia's standard manufacturing process. The device meets EU Directive 2011/65/EU and carries the "Pb-free" marking on its top-side laser marking. All SOT23 packages produced after 2017 comply with JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) requirements.

What is the maximum safe operating frequency for BCX19,215 in switching mode?

The BCX19,215 has an f_T of 100 MHz, but practical switching frequency is limited by stored charge and base drive capability. For reliable saturated switching with 50 mA base current, maximum usable frequency is ~1–2 MHz. Above this, V_CE(sat) increases and switching losses rise significantly due to minority carrier lifetime.

Can BCX19,215 replace BCX17 in a circuit?

No - BCX19,215 is NPN, while BCX17 is its PNP complement. Swapping them would invert logic polarity and likely cause circuit failure. They share identical SOT23 package and pinout (1=base, 2=emitter, 3=collector), but opposite current flow direction and bias requirements.

Does BCX19,215 require a base resistor in all applications?

Yes - a series base resistor is mandatory to limit I_B and prevent thermal runaway. For 500 mA collector current with h_FE ≥ 100, minimum I_B = 5 mA is required; typical design uses 10–22 kΩ from 3.3 V or 4.7–10 kΩ from 5 V to ensure saturation while avoiding excessive base current.

BCX19,215 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

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

Vce Saturation (Max) @ Ib, Ic:: 620mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 1V

Power - Max:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BCX19,215 FAQ

1.How can I place an order for BCX19,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX19,215 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 BCX19,215 reliable?

The price and inventory of BCX19,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX19,215 is usually 5 days.

3.What payment methods are accepted for BCX19,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX19,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX19,215?

BCX19,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX19,215 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 BCX19,215?

For technical support, including BCX19,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX19,215 requirements.

6.How does Aetrix verify that BCX19,215 is sourced from the original manufacturer or authorized distributors?

All BCX19,215 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 BCX19,215 meets industry standards.

7.What is the process for return or replacement of BCX19,215?

All BCX19,215 units undergo pre-shipment inspection (PSI). If there is an issue with BCX19,215, 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 BCX19,215 part is unused and in its original packaging.

Return procedure for BCX19,215:

1.Submit a request within 90 days.

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

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