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

Nexperia USA Inc. BCX18,235

Name: BCX18,235
Brand: Nexperia USA Inc.
SKU: BCX18,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX18,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BCX18,235.pdf

Description:: TRANS PNP 25V 0.5A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:9,840

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Product details

Overview

BCX18,235 from NXP Semiconductors is a PNP general-purpose bipolar junction transistor in SOT23 package, rated for −25 V V_CEO, −500 mA I_C, and 250 mW P_tot, used in saturated switching and driver circuits for industrial control and thin-film applications.

For engineers reviewing the BCX18,235 datasheet, BCX18,235 pinout, BCX18,235 application, or BCX18,235 equivalent, key selection factors include its −25 V collector-emitter breakdown, −500 mA DC current capability, SOT23 thermal resistance (500 K/W), and verified PNP complement relationship with BCX19.

Technical Context

This PNP transistor operates in linear or saturated switching modes with guaranteed h_FE of 100–600 at −100 mA I_C, dropping to ≥40 at −500 mA. Its V_CEsat is ≤−620 mV at −500 mA I_C and −50 mA I_B, enabling low-loss switching in compact industrial drivers.

Thermal performance is defined for FR4 PCB mounting (R_th(j-a) = 500 K/W); junction temperature is rated up to 150 °C. Cutoff leakage (I_CBO ≤−100 nA at −20 V V_CB) supports stable biasing in ambient temperatures from −65 °C to +150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−25 V: Maximum safe collector-emitter voltage before breakdown in open-base configuration.
I_C (DC)	−500 mA: Continuous collector current rating defining maximum load drive capability.
P_tot	250 mW at T_amb ≤ 25 °C: Power dissipation limit determining thermal derating requirements on FR4 PCB.
h_FE	100–600 @ −100 mA I_C: DC current gain range enabling predictable base drive sizing for switching.
V_CEsat	≤−620 mV @ −500 mA I_C, −50 mA I_B: Low saturation voltage minimizing conduction loss in on-state.
f_T	80 MHz @ −10 mA I_C: Transition frequency indicating usable bandwidth for small-signal amplification or fast switching.

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-lead, dimensions per JEDEC outline: 2.8 mm × 1.4 mm × 1.1 mm height, designed for automated pick-and-place and reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal accepting base current to enable PNP conduction; requires negative bias relative to emitter.
2	Emiter	Current source terminal; connected to higher potential rail in typical common-emitter switch configuration.
3	Collector	Current sink terminal; delivers load current to ground or lower-potential node when saturated.

Key Features

Feature	Design Value
High DC current capability	Rated −500 mA continuous collector current supports driving relays, LEDs, and logic-level loads without external buffering.
Low saturation voltage	V_CEsat ≤−620 mV ensures <1.25 mW conduction loss at 500 mA, reducing thermal stress in space-constrained designs.
Wide operating temperature range	−65 °C to +150 °C storage and operating range enables use in automotive under-hood and industrial environments.
Complementary pairing	Direct PNP counterpart to NPN BCX19, simplifying push-pull and H-bridge driver design with matched package and gain profiles.

Applications

Industrial Relay Driver

LED Current Switch

Use Scenario: Driving 24 V DC industrial relay coils requiring ~40 mA hold current and 120 mA pull-in surge.

IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking coil current to ground when base is pulled low.

Use Value: −25 V V_CEO and −500 mA I_C provide 5× safety margin over relay requirements, ensuring long-term reliability under voltage transients.

Use Scenario: Controlling high-brightness white LED strings (3.2 V forward, 350 mA nominal) from microcontroller GPIO.

IC Role / Device Role / Timing Role: Constant-current switch regulating LED current via emitter resistor feedback and base drive scaling.

Use Value: h_FE ≥40 at −500 mA enables precise current setting with minimal base drive overhead, reducing MCU pin loading.

Thin-Film Circuit Amplifier

Level-Shifting Interface

Use Scenario: Small-signal amplification stage in hybrid thick-film power supply feedback loop operating at 10–100 kHz.

IC Role / Device Role / Timing Role: Linear-mode PNP amplifier providing inverted gain with stable bias point across temperature.

Use Value: f_T = 80 MHz and low C_c = 9 pF support stable closed-loop response without phase-margin degradation.

Use Scenario: Translating 3.3 V logic signals to −5 V control lines in legacy industrial backplane interfaces.

IC Role / Device Role / Timing Role: Inverting level shifter using emitter-follower or common-base topology for bidirectional signal translation.

Use Value: −5 V V_EBO rating allows safe reverse-bias operation during signal transitions, preventing base-emitter junction damage.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCX17,235	Higher −45 V V_CEO and −50 V V_CBO; otherwise identical SOT23 pinout and gain profile.	Better suited for 36 V industrial bus systems where transient overvoltage exceeds −25 V.	Select BCX17,235 when system V_CC > 28 V or transient immunity is critical; BCX18,235 remains optimal for ≤24 V rails.
MMBT3906LT1G	Same SOT23 package but lower −40 V V_CEO, −200 mA I_C, and narrower h_FE range (100–300).	Targeted at low-power signal switching, not high-current driver roles.	Choose MMBT3906LT1G only for sub-200 mA loads; BCX18,235 provides 2.5× current headroom for robust industrial use.

Compared with BCX17,235 and MMBT3906LT1G, BCX18,235 uniquely balances −25 V breakdown, −500 mA current, and SOT23 footprint-making it the preferred choice for cost-sensitive 24 V industrial drivers where BCX17's higher voltage is unnecessary and MMBT3906's current limit is insufficient.

Availability

BCX18,235 is available at Aetrix Electronics and suitable for industrial relay drivers, LED current switches, thin-film circuit amplifiers, and level-shifting interfaces requiring stable component supply and consistent SOT23 packaging.

Supply support for BCX18,235 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

BCX18,235 belongs to NXP's legacy discrete transistor product line, engineered for cost-effective, high-reliability saturated switching in industrial control and power interface circuits.

FAQ

Is BCX18,235 pin-compatible with BCX19?

No-BCX18,235 is a PNP transistor while BCX19 is its NPN complement. They share identical SOT23 pinout (1=base, 2=emitter, 3=collector), but polarity reversal means direct substitution without circuit redesign will cause functional failure. Use BCX19 only in complementary configurations like push-pull stages.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is −200 mA, but continuous operation should be limited to ≤−50 mA to maintain V_CEsat ≤−620 mV and avoid thermal runaway. At −500 mA collector current, a base drive of −50 mA yields h_FE ≥10, ensuring reliable saturation without excessive base power dissipation.

Can BCX18,235 be used in linear amplifier applications?

Yes-its f_T of 80 MHz and specified h_FE across multiple current levels support small-signal amplification up to ~100 kHz. However, thermal resistance (500 K/W) limits usable power gain; it is best applied in low-power, high-gain preamplifier or feedback compensation stages-not RF or high-fidelity audio.

Does BCX18,235 have lead-free and RoHS-compliant variants?

Yes-BCX18,235 is manufactured in lead-free, RoHS-compliant versions per NXP's standard qualification. The "235" suffix denotes tape-and-reel packaging compliant with J-STD-020 moisture sensitivity level 1 (MSL1), suitable for standard reflow profiles without preconditioning.

BCX18,235 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:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 25 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:: 80MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BCX18,235 FAQ

1.How can I place an order for BCX18,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX18,235 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 BCX18,235 reliable?

The price and inventory of BCX18,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX18,235 is usually 5 days.

3.What payment methods are accepted for BCX18,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX18,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX18,235?

BCX18,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX18,235 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 BCX18,235?

For technical support, including BCX18,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX18,235 requirements.

6.How does Aetrix verify that BCX18,235 is sourced from the original manufacturer or authorized distributors?

All BCX18,235 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 BCX18,235 meets industry standards.

7.What is the process for return or replacement of BCX18,235?

All BCX18,235 units undergo pre-shipment inspection (PSI). If there is an issue with BCX18,235, 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 BCX18,235 part is unused and in its original packaging.

Return procedure for BCX18,235:

1.Submit a request within 90 days.

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

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