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

Nexperia USA Inc. BCX70K,235

Name: BCX70K,235
Brand: Nexperia USA Inc.
SKU: BCX70K,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX70K,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BCX70K,235.pdf

Description:: TRANS NPN 45V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BCX70K,235 from Nexperia is an NPN general-purpose bipolar junction transistor in SOT23 package, rated for 45 V V_CEO, 100 mA I_C, and featuring h_FE of 380–630 at I_C = 2 mA / V_CE = 5 V. It serves as a low-voltage switching and small-signal amplification device in consumer interface circuits, LED drivers, and sensor signal conditioning stages.

For engineers reviewing the BCX70K,235 datasheet, BCX70K,235 pinout, BCX70K,235 application, or BCX70K,235 equivalent, key selection criteria include DC current gain consistency across temperature, low V_CE(sat) at 50 mA drive, thermal resistance (500 K/W), and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This transistor operates in linear or saturated mode depending on base drive, with verified h_FE minima of 100 at I_C = 50 mA / V_CE = 1 V and 380 at I_C = 2 mA / V_CE = 5 V. Its f_T of 100–250 MHz supports audio-frequency amplification and low-speed digital switching up to ~10 MHz.

Thermal performance is defined for FR4 mounting (R_th(j-a) = 500 K/W); V_BE(sat) remains ≤1050 mV at I_C = 50 mA / I_B = 1.25 mA, enabling efficient low-side switch operation with minimal base drive loss.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown under open-base condition; sets safe operating range for 3.3 V/5 V logic-level interfaces.
I_C (DC)	100 mA - Continuous collector current limit; suitable for driving LEDs, relays, or small MOSFET gates without heatsinking.
h_FE	380–630 @ I_C=2 mA - High DC gain enables low-base-current biasing in amplifier stages and reduces MCU GPIO loading.
V_CE(sat)	100–550 mV @ I_C=50 mA - Low saturation voltage minimizes power loss and self-heating in switching applications.
f_T	100–250 MHz - Transition frequency confirms usable bandwidth for audio preamps and pulse shaping up to ~10 MHz.
R_th(j-a)	500 K/W - Thermal resistance on FR4 board defines maximum power dissipation (250 mW) before junction exceeds 150 °C.

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-pin, 1.3 mm × 2.9 mm footprint, 0.95 mm height, with gull-wing leads. RoHS-compliant, halogen-free, and qualified per AEC-Q101 for industrial reliability.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires current-limited drive (I_B ≤ 200 mA peak) to achieve target I_C and avoid second breakdown.
2	Emitter	Reference node for bias network; connected to ground or common return path in low-side switch configurations.
3	Collector	Output terminal; handles switched load current up to 100 mA DC; routed away from sensitive analog traces to minimize coupling.

Key Features

Feature	Design Value
High h_FE consistency	Min 380 at I_C = 2 mA ensures stable bias point across production lots and temperature (−65 °C to +150 °C).
Low V_CE(sat)	≤550 mV at I_C = 50 mA reduces conduction loss by >40% vs. standard 2N3904 in identical switching conditions.
Small-signal noise performance	F = 2–6 dB @ 1 kHz enables use in low-noise preamplifier front-ends without added filtering.
Thermal robustness	Junction rated to 150 °C with T_stg = −65 to +150 °C supports operation in unheated industrial enclosures.

Applications

LED Driver Circuit

Microcontroller Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V GPIO pins in portable instrumentation.

IC Role / Device Role / Timing Role: NPN low-side switch controlled by microcontroller output.

Use Value: V_CE(sat) ≤ 350 mV at I_C = 10 mA ensures >90% LED forward voltage utilization and minimal GPIO current burden.

Use Scenario: Level-shifting and signal inversion between 1.8 V logic and 5 V peripherals.

IC Role / Device Role / Timing Role: Digital inverter with rail-to-rail output swing.

Use Value: h_FE ≥ 380 allows full saturation with <10 μA base drive, preserving MCU drive strength for multiple loads.

Sensor Signal Amplifier

Power Supply Enable Switch

Use Scenario: Amplifying low-level thermistor or photodiode signals in battery-powered environmental monitors.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier stage.

Use Value: f_T ≥ 100 MHz and F ≤ 6 dB support 10 kHz bandwidth with SNR > 60 dB using passive bias networks.

Use Scenario: Enabling/disabling 5 V auxiliary rails in embedded systems via MCU-controlled enable line.

IC Role / Device Role / Timing Role: High-side or low-side power switch (with external pull-up/pull-down).

Use Value: I_C = 100 mA rating and R_th(j-a) = 500 K/W allow continuous 5 V/50 mA rail control without derating at 70 °C ambient.

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
BC847BK,215	Same SOT23 package; h_FE = 200–450 @ I_C = 2 mA - lower mid-range gain than BCX70K.	Lower gain requires higher base drive; less suitable for ultra-low-I_B designs but more consistent h_FE distribution.	Select when tighter h_FE tolerance (±25%) and broader qualification (AEC-Q101 Grade 1) are required over peak gain.
MMBT3904LT1G	h_FE = 100–300 @ I_C = 10 mA - significantly lower gain at medium currents; V_CE(sat) = 200–300 mV @ I_C = 10 mA.	Higher V_CE(sat) at 50 mA limits use in higher-current switching; better suited for 10–20 mA loads.	Choose for cost-sensitive consumer designs where 100 mA capability is not needed and legacy footprint compatibility is critical.

Compared with BC847BK,215 and MMBT3904LT1G, BCX70K,235 delivers superior h_FE at both low and medium collector currents, enabling lower base drive power and improved noise margin in precision biasing-critical for battery-operated sensor nodes and compact logic interfaces.

Availability

BCX70K,235 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface logic, sensor signal amplifiers, and power supply enable switches requiring stable component supply and industrial-grade reliability.

Supply support for BCX70K,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 discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The BCX70 series belongs to Nexperia's general-purpose transistor product line, designed specifically for cost-effective, reliable switching and amplification in space-constrained PCBs where SOT23 footprint and consistent h_FE are critical.

FAQ

Is BCX70K,235 pin-compatible with BCX70G/H/J variants?

Yes - all BCX70 variants share identical SOT23 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector) and mechanical dimensions. Only h_FE grading differs: BCX70K specifies 380–630, while BCX70G is ungraded and BCX70H/J have lower minimum gains. No layout change is needed when substituting within the series.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 200 mA (per limiting values table), but for continuous DC operation, I_B must be limited to ensure I_C ≤ 100 mA and P_tot ≤ 250 mW. At h_FE = 380, this corresponds to I_B ≤ 263 μA for I_C = 100 mA - practical designs use 2–5× safety margin, i.e., ≤ 50–100 μA continuous.

Can BCX70K,235 replace BC847B in existing designs?

Yes, with verification of h_FE requirements: BCX70K offers higher minimum h_FE (380 vs. 200) at I_C = 2 mA, improving bias stability. However, its V_CE(sat) is slightly higher at 50 mA (550 mV vs. ~400 mV for BC847B), so check power dissipation in high-current switching. SOT23 footprint and pinout are identical.

Does BCX70K,235 meet automotive qualification standards?

No - BCX70K,235 is qualified to industrial temperature range (−65 °C to +150 °C) and meets JEDEC JESD22-A108 reliability testing, but it is not AEC-Q101 qualified. For automotive applications, Nexperia recommends the BC847BQ series (AEC-Q101 Grade 1) or PBSS4041T (AEC-Q101 qualified NPN with similar specs).

BCX70K,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):: 100 mA

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

Vce Saturation (Max) @ Ib, Ic:: 550mV @ 1.25mA, 50mA

Current - Collector Cutoff (Max):: 20nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 380 @ 2mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 250MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BCX70K,235 FAQ

1.How can I place an order for BCX70K,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX70K,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 BCX70K,235 reliable?

The price and inventory of BCX70K,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX70K,235 is usually 5 days.

3.What payment methods are accepted for BCX70K,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX70K,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX70K,235?

BCX70K,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX70K,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 BCX70K,235?

For technical support, including BCX70K,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX70K,235 requirements.

6.How does Aetrix verify that BCX70K,235 is sourced from the original manufacturer or authorized distributors?

All BCX70K,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 BCX70K,235 meets industry standards.

7.What is the process for return or replacement of BCX70K,235?

All BCX70K,235 units undergo pre-shipment inspection (PSI). If there is an issue with BCX70K,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 BCX70K,235 part is unused and in its original packaging.

Return procedure for BCX70K,235:

1.Submit a request within 90 days.

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

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