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

Nexperia USA Inc. BCX19,235

Name: BCX19,235
Brand: Nexperia USA Inc.
SKU: BCX19,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX19,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BCX19,235.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:7,391

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Product details

Overview

BCX19,235 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, with DC current gain (h_FE) of 100–600 at 100 mA. It serves as a low-voltage switching or amplification device in compact power management stages of consumer electronics and industrial control modules.

For engineers reviewing the BCX19,235 datasheet, BCX19,235 pinout, BCX19,235 application, or BCX19,235 equivalent, this page delivers verified electrical parameters, thermal resistance (500 K/W), transition frequency (100 MHz), saturation voltage (620 mV), and complementary PNP pairing (BCX17) - all critical for discrete BJT selection in space-constrained, cost-sensitive designs.

Technical Context

The BCX19 operates as a silicon NPN planar epitaxial transistor optimized for linear amplification and saturated switching. Its h_FE variation across 100–500 mA collector current (70–40 min) and V_CEsat ≤ 620 mV at I_C = 500 mA / I_B = 50 mA support predictable gain-controlled drive and low-loss on-state performance.

Thermal design relies on R_th(j-a) = 500 K/W on FR4 PCB, limiting continuous operation to ~250 mW at T_amb ≤ 25 °C. C_c = 5 pF and f_T = 100 MHz indicate suitability for audio-frequency and low-MHz digital signal switching, not RF or high-speed logic.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in low-voltage switch applications
I_C (DC)	500 mA - continuous collector current rating; sets load-driving capacity in relay drivers or LED arrays
P_tot	250 mW - total power dissipation at 25 °C ambient; constrains usable current/voltage combinations on standard FR4 PCB
h_FE	100–600 @ I_C = 100 mA - wide DC current gain range enabling flexible bias network design without gain-critical trimming
V_CEsat	≤ 620 mV @ I_C = 500 mA, I_B = 50 mA - ensures low conduction loss and minimal self-heating during saturation
f_T	100 MHz - transition frequency confirming usable bandwidth up to ~10–20 MHz for small-signal amplification
C_c	5 pF - collector capacitance at 10 V reverse bias; contributes to Miller effect and limits high-frequency switching speed

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. Thermal resistance R_th(j-a) = 500 K/W measured on FR4 board.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires ~50 mA base drive for full 500 mA collector saturation
2	Emiter	Reference terminal for biasing; connected to ground or common emitter node in common-emitter configurations
3	Collector	Output current path; 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 driving medium-power loads like relays and small solenoids
Low saturation voltage	V_CEsat ≤ 620 mV reduces power loss and heat generation in switching mode
Wide h_FE range	100–600 enables robust circuit operation across process and temperature variations without feedback compensation
Complementary PNP pair	BCX17 available for push-pull or differential amplifier topologies requiring matched characteristics

Applications

Relay Driver Circuit

LED Current Switch

Use Scenario: Driving 12 V/100 mA electromagnetic relay coil from microcontroller GPIO.

IC Role / Device Role / Timing Role: NPN switch operating in saturation to close relay contacts with minimal voltage drop.

Use Value: V_CEsat ≤ 620 mV ensures >11.3 V across coil for reliable pull-in; 500 mA rating provides margin against inrush current.

Use Scenario: Constant-current switching of white LED strings in portable lighting.

IC Role / Device Role / Timing Role: Low-side current switch controlling LED on/off state via base drive.

Use Value: h_FE ≥ 100 allows simple resistor-based base bias; 45 V V_CEO accommodates transient spikes in battery-powered systems.

Audio Pre-amplifier Stage

Industrial Sensor Interface

Use Scenario: Small-signal amplification of electret microphone output before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias, delivering mid-band voltage gain.

Use Value: f_T = 100 MHz supports flat response up to 20 kHz; low C_c minimizes high-frequency roll-off.

Use Scenario: Level-shifting and isolation of 5 V digital sensor signals to 3.3 V MCU inputs.

IC Role / Device Role / Timing Role: Digital buffer transistor translating logic levels with fast edge handling.

Use Value: 100 MHz f_T and 5 pF C_c enable clean 1–5 MHz signal transitions without ringing or delay skew.

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	Same SOT23 package; h_FE = 250–630 @ 100 mA; V_CEO = 45 V; P_tot = 300 mW	Higher power rating allows marginally higher continuous current at same ambient	Preferred where thermal headroom or tighter h_FE consistency is required
MMBT2222ALT1G	V_CEO = 40 V; h_FE = 100–300 @ 150 mA; P_tot = 310 mW; different pinout (E-B-C vs B-E-C)	Lower V_CEO restricts use in 45 V rail systems; pinout mismatch requires PCB redesign	Only suitable if voltage margin permits and layout accommodates reversed emitter/base pins

Compared with BCX19,235, BC817-40 offers higher power margin and tighter h_FE spread, while MMBT2222ALT1G trades voltage headroom and pin compatibility for broader industry availability - both require validation of bias network and thermal layout.

Availability

BCX19,235 is available at Aetrix Electronics and suitable for relay driver circuits, LED current switches, audio pre-amplifier stages, and industrial sensor interfaces requiring stable component supply and long-term obsolescence management.

Supply support for BCX19,235 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 high-volume discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The BCX19 belongs to Nexperia's general-purpose bipolar transistor product line, designed for cost-effective, space-efficient amplification and switching in non-critical analog and digital interface functions.

FAQ

Is BCX19,235 RoHS compliant and lead-free?

Yes, BCX19,235 is RoHS compliant and lead-free per Nexperia's standard manufacturing process. The SOT23 package uses lead-free solderable terminations, and material declarations confirm compliance with EU Directive 2011/65/EU and its amendments. Full substance data is available in Nexperia's official compliance documentation.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current (I_BM) is 200 mA, but for continuous DC operation, base current should be limited to ensure junction temperature remains within 150 °C. At I_C = 500 mA and h_FE ≥ 100, typical I_B = 5–10 mA; sustained I_B > 50 mA requires thermal derating per the 500 K/W R_th(j-a).

Does BCX19,235 have a qualified automotive grade variant?

No, BCX19,235 is not AEC-Q101 qualified. Nexperia offers automotive-grade equivalents such as the BCX19-Q (AEC-Q101 certified) with identical electrical specs but extended temperature screening and traceability. Standard BCX19,235 is intended for industrial and consumer applications only.

Can BCX19,235 replace BC547 in existing designs?

BCX19,235 can replace BC547 in many SOT23-based designs due to matching pinout (B-E-C) and overlapping V_CEO (45 V vs 45 V) and I_C (500 mA vs 100 mA). However, BCX19's higher current rating and lower V_CEsat may alter bias point stability; verify h_FE spread and thermal behavior under actual load conditions.

BCX19,235 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

BCX19,235 FAQ

1.How can I place an order for BCX19,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX19,235 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 BCX19,235 reliable?

The price and inventory of BCX19,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX19,235 is usually 5 days.

3.What payment methods are accepted for BCX19,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX19,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX19,235?

BCX19,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX19,235 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 BCX19,235?

For technical support, including BCX19,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX19,235 requirements.

6.How does Aetrix verify that BCX19,235 is sourced from the original manufacturer or authorized distributors?

All BCX19,235 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 BCX19,235 meets industry standards.

7.What is the process for return or replacement of BCX19,235?

All BCX19,235 units undergo pre-shipment inspection (PSI). If there is an issue with BCX19,235, 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 BCX19,235 part is unused and in its original packaging.

Return procedure for BCX19,235:

1.Submit a request within 90 days.

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

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