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

NXP Semiconductors BF240,112

Name: BF240,112
Brand: NXP Semiconductors
SKU: BF240,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BF240,112

Manufacturer:: NXP Semiconductors

Category:: Bipolar RF Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BF240,112.pdf

Description:: RF TRANS NPN 40V 150MHZ TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,004

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Product details

Overview

BF240 from NXP Semiconductors (formerly Philips) is an NPN medium-frequency transistor in TO-92 (SOT54/SC-43A) package, rated for V_CEO = 40 V, I_C = 25 mA, P_tot = 300 mW, f_T = 150 MHz, and used in AM mixer and IF amplifier stages of broadcast receivers.

For engineers reviewing the BF240 datasheet, BF240 pinout, BF240 application, or BF240 equivalent, this page delivers verified electrical parameters, thermal resistance (R_th(j-a) = 420 K/W), cutoff current limits, DC gain range (h_FE = 67–220), and package-mapped terminal roles for RF front-end design validation.

Technical Context

The BF240 operates as a low-power, medium-frequency amplifying transistor optimized for small-signal RF applications up to ~150 MHz. Its design emphasizes low noise and stable gain at collector currents of 1–10 mA with V_CE = 10 V.

It features low junction-to-ambient thermal resistance (420 K/W on FR4), tight V_BE distribution (675–775 mV at I_C = 1 mA), and minimal feedback capacitance (C_re ≤ 0.5 pF), supporting stable high-frequency biasing and impedance matching in tuned amplifier topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage under open-base condition; defines headroom for AM/FM IF stage supply rails.
I_C	25 mA - Absolute max DC collector current; sets upper limit for quiescent bias in low-power mixer designs.
f_T	150 MHz - Transition frequency at V_CE = 10 V, I_C = 1 mA; confirms usable gain bandwidth for 455 kHz–10.7 MHz IF amplification.
h_FE	67–220 - DC current gain range at V_CE = 10 V, I_C = 1 mA; enables predictable bias point selection across production lots.
C_re	≤ 0.5 pF - Feedback capacitance at V_CB = 10 V; minimizes Miller effect in common-emitter IF amplifiers.
R_th(j-a)	420 K/W - Junction-to-ambient thermal resistance on FR4 PCB; determines allowable power dissipation without heatsinking.

Pinout & Package

Package: TO-92 (SOT54 / SC-43A), plastic single-ended leaded through-hole package with 3 leads, body length 14.5 mm, lead pitch 2.54 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control electrode for current amplification; requires stable DC bias network for linear small-signal operation.
2	Emiter	Current source terminal in common-emitter configuration; connected to ground or emitter degeneration resistor.
3	Collector	Output current sink terminal; interfaces with tuned LC load or IF transformer primary winding.

Key Features

Feature	Design Value
Low-noise RF amplification	Verified C_re ≤ 0.5 pF and f_T ≥ 150 MHz support stable small-signal gain in AM/FM IF strips without oscillation.
Controlled DC gain spread	h_FE = 67–220 at I_C = 1 mA enables consistent bias design across manufacturing batches.
Thermally robust packaging	R_th(j-a) = 420 K/W on FR4 allows 300 mW dissipation with <130 °C junction rise at 25 °C ambient.
Low-voltage, low-current operation	V_CEO = 40 V and I_C = 25 mA rating match standard battery- or regulator-powered portable receiver power envelopes.

Applications

AM Mixer Stage	IF Amplifier (455 kHz)
Use Scenario: Local oscillator signal mixing with RF input in AM broadcast band (530–1700 kHz) to generate intermediate frequency. IC Role / Device Role / Timing Role: NPN transistor operating in active region as switching or analog multiplier element in unbalanced mixer topology. Use Value: Low C_re and high f_T minimize LO feedthrough and preserve conversion gain at target IF.	Use Scenario: High-gain, selective amplification of 455 kHz IF signal after mixer output in AM radio receivers. IC Role / Device Role / Timing Role: Common-emitter amplifier with parallel LC tank load for bandpass filtering and voltage gain. Use Value: Stable h_FE range and low V_BE variation ensure repeatable gain and bias stability across temperature.
FM IF Amplifier (10.7 MHz)	Portable Receiver Front-End
Use Scenario: Linear amplification of 10.7 MHz IF signal in FM broadcast receivers prior to demodulation. IC Role / Device Role / Timing Role: Small-signal NPN amplifier biased for Class-A operation with tuned collector load. Use Value: 150 MHz f_T provides >10× bandwidth margin over 10.7 MHz, ensuring flat gain response and phase linearity.	Use Scenario: Compact, low-power RF amplification in battery-operated portable radios with space-constrained PCB layouts. IC Role / Device Role / Timing Role: General-purpose medium-frequency transistor mounted in through-hole TO-92 for serviceability and thermal reliability. Use Value: TO-92 mechanical robustness and 300 mW power rating enable reliable operation under intermittent duty cycles without derating.

AM Mixer Stage

IF Amplifier (455 kHz)

Use Scenario: Local oscillator signal mixing with RF input in AM broadcast band (530–1700 kHz) to generate intermediate frequency.

IC Role / Device Role / Timing Role: NPN transistor operating in active region as switching or analog multiplier element in unbalanced mixer topology.

Use Value: Low C_re and high f_T minimize LO feedthrough and preserve conversion gain at target IF.

Use Scenario: High-gain, selective amplification of 455 kHz IF signal after mixer output in AM radio receivers.

IC Role / Device Role / Timing Role: Common-emitter amplifier with parallel LC tank load for bandpass filtering and voltage gain.

Use Value: Stable h_FE range and low V_BE variation ensure repeatable gain and bias stability across temperature.

FM IF Amplifier (10.7 MHz)

Portable Receiver Front-End

Use Scenario: Linear amplification of 10.7 MHz IF signal in FM broadcast receivers prior to demodulation.

IC Role / Device Role / Timing Role: Small-signal NPN amplifier biased for Class-A operation with tuned collector load.

Use Value: 150 MHz f_T provides >10× bandwidth margin over 10.7 MHz, ensuring flat gain response and phase linearity.

Use Scenario: Compact, low-power RF amplification in battery-operated portable radios with space-constrained PCB layouts.

IC Role / Device Role / Timing Role: General-purpose medium-frequency transistor mounted in through-hole TO-92 for serviceability and thermal reliability.

Use Value: TO-92 mechanical robustness and 300 mW power rating enable reliable operation under intermittent duty cycles without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC546B	Higher h_FE (200–450), same V_CEO/I_C, but f_T = 300 MHz and lower R_th(j-a) (320 K/W).	Better suited for higher-gain, wider-bandwidth IF stages; less ideal for low-noise AM mixers due to higher C_re.	Select BC546B when higher gain and bandwidth are prioritized over minimal feedback capacitance.
2N2222A	Higher power rating (P_tot = 500 mW), V_CEO = 40 V, f_T = 250 MHz, but larger TO-18 metal can package.	Requires different footprint and mounting; better thermal performance but incompatible with TO-92 board layout.	Choose 2N2222A only if thermal headroom or higher f_T justifies PCB redesign and cost increase.

Compared with BC546B and 2N2222A, the BF240 offers the lowest feedback capacitance (≤0.5 pF) and best-suited TO-92 form factor for legacy AM/FM receiver IF stages where layout compatibility and noise control outweigh raw gain or bandwidth.

Availability

BF240 is available at Aetrix Electronics and suitable for AM mixer circuits, IF amplifiers in broadcast receivers, portable radio front-ends, and low-power RF signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for BF240 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 leader specializing in secure connectivity solutions, automotive ICs, and legacy discrete components inherited from Philips.

The BF240 belongs to NXP's legacy general-purpose RF transistor product line, designed specifically for analog signal processing in consumer broadcast equipment and portable radio systems.

FAQ

What is the maximum collector-emitter voltage rating for the BF240?

The BF240 has a maximum collector-emitter voltage (V_CEO) rating of 40 V under open-base conditions, as specified in the Absolute Maximum Ratings table. This value defines the upper voltage limit across the collector and emitter terminals during normal operation and must not be exceeded to prevent device breakdown. The BF240 is intended for low-voltage RF applications such as AM/FM IF amplifiers where supply rails typically remain below 12 V.

Does the BF240 have a documented transition frequency (f_T)?

Yes, the BF240 has a minimum transition frequency (f_T) of 150 MHz, measured at V_CE = 10 V and I_C = 1 mA. This parameter confirms its suitability for medium-frequency amplification up to the FM IF band (10.7 MHz) with significant bandwidth margin. The BF240's f_T is validated per the manufacturer's 2004 product specification and supports stable small-signal gain in tuned amplifier configurations.

What is the thermal resistance of the BF240 on a standard FR4 PCB?

The BF240 exhibits a junction-to-ambient thermal resistance (R_th(j-a)) of 420 K/W when mounted on a standard FR4 printed-circuit board, as stated in the Thermal Characteristics section. This value assumes no heatsink and standard copper land patterns. It directly determines the allowable power dissipation-e.g., at 25 °C ambient, the BF240 can safely dissipate 300 mW before reaching its 150 °C maximum junction temperature.

Is the BF240 pinout compatible with standard TO-92 footprints?

Yes, the BF240 uses the standard TO-92 outline (SOT54/SC-43A) with pin 1 = base, pin 2 = emitter, pin 3 = collector-matching industry-standard TO-92 mechanical dimensions and lead pitch (2.54 mm). Its pinout is electrically and physically compatible with common TO-92 PCB footprints, enabling drop-in replacement in legacy AM/FM receiver designs without layout modification.

What are the typical applications explicitly cited for the BF240 in its official datasheet?

The official Philips/NXP datasheet explicitly cites two applications for the BF240: AM mixers and IF amplifiers in AM/FM receivers. These use cases reflect its optimized small-signal RF performance, including low feedback capacitance (≤0.5 pF), 150 MHz f_T, and controlled h_FE spread. The BF240 was engineered for these specific roles in analog broadcast receiver signal chains-not general-purpose switching or power amplification.

BF240,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Voltage - Collector Emitter Breakdown (Max):: 40V

Frequency - Transition:: 150MHz

Noise Figure (dB Typ @ f):: -

Gain:: -

Power - Max:: 300mW

DC Current Gain (hFE) (Min) @ Ic, Vce:: 67 @ 1mA, 10V

Current - Collector (Ic) (Max):: 25mA

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BF240,112 FAQ

1.How can I place an order for BF240,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for BF240,112 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 BF240,112 reliable?

The price and inventory of BF240,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF240,112 is usually 5 days.

3.What payment methods are accepted for BF240,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF240,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF240,112?

BF240,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF240,112 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 BF240,112?

For technical support, including BF240,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF240,112 requirements.

6.How does Aetrix verify that BF240,112 is sourced from the original manufacturer or authorized distributors?

All BF240,112 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 BF240,112 meets industry standards.

7.What is the process for return or replacement of BF240,112?

All BF240,112 units undergo pre-shipment inspection (PSI). If there is an issue with BF240,112, 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 BF240,112 part is unused and in its original packaging.

Return procedure for BF240,112:

1.Submit a request within 90 days.

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

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