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

NXP Semiconductors BFS17A,235

Name: BFS17A,235
Brand: NXP Semiconductors
SKU: BFS17A,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BFS17A,235

Manufacturer:: NXP Semiconductors

Category:: Bipolar RF Transistors

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

Datasheet:: BFS17A,235.pdf

Description:: RF TRANS NPN 15V 2.8GHZ TO236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BFS17A,235 from NXP Semiconductors is an NPN silicon RF transistor in SOT23 package, rated for 3 GHz transition frequency (f_T = 2.8 GHz), 15 V V_CEO, and 25 mA I_C, designed for oscillator stages in TV tuner front-ends requiring low-noise, high-gain wideband amplification.

For engineers reviewing the BFS17A,235 datasheet, BFS17A,235 pinout, BFS17A,235 application, or BFS17A,235 equivalent, key selection criteria include its 2.5 dB noise figure at 800 MHz, 13.5 dB maximum unilateral gain, 0.7 pF collector capacitance, and SOT23 thermal resistance of 260 K/W - all critical for RF small-signal design stability and intermodulation performance.

Technical Context

The BFS17A,235 employs a planar epitaxial NPN structure optimized for wideband RF operation up to 3 GHz, with f_T measured at 2.8 GHz under 25 mA I_C and 5 V V_CE. Its low feedback capacitance (C_re = 0.6 pF) and emitter capacitance (C_e = 1.25 pF) support stable high-frequency oscillator and amplifier configurations.

It operates with DC bias conditions typical of TV tuner IF/RF stages: V_CE = 10 V, I_C = 14 mA yields G_UM = 13.5 dB at 800 MHz; noise figure is minimized at 2.5 dB with I_C = 2 mA, V_CE = 5 V, and Z_S = 60 Ω - confirming suitability for low-noise preamplifier roles.

Key Specifications

Parameter	Value and Actual Design Meaning
f_T	2.8 GHz - defines usable small-signal amplification bandwidth up to UHF band
F (Noise Figure)	2.5 dB at 800 MHz - enables low-noise reception in TV tuner front-end amplifiers
G_UM	13.5 dB at 800 MHz - provides sufficient gain margin for stable oscillator loop design
V_CEO	15 V - supports standard 12 V TV tuner supply rails with headroom for transients
C_c	0.7 pF - minimizes Miller effect and improves high-frequency stability in common-emitter configs
R_{th j-s}	260 K/W - limits junction temperature rise under 300 mW P_tot in SOT23 mounting
h_FE	25–90 - ensures predictable DC biasing across production lots at I_C = 2–25 mA

Pinout & Package

Package: SOT23 (TO-236AB), plastic surface-mounted, 3-lead, marking code E2p. Dimensions per IEC/JEDEC outline: D = 2.8 mm, E = 1.4 mm, L_p = 0.95 mm, e = 1.9 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	DC bias and RF input node; requires impedance-matched network for optimal noise/gain trade-off
2	Emiter	AC ground reference in common-base configuration; connected to RF ground plane via shortest possible path
3	Collector	RF output and power delivery node; soldering point defines thermal resistance R_{th j-s} = 260 K/W

Key Features

Feature	Design Value
3 GHz wideband operation	Validated f_T = 2.8 GHz enables use in 470–862 MHz TV tuner oscillators without external tuning
Low intermodulation distortion	VO = 150 mV at f(p+q−r) = 793.25 MHz confirms robust two-tone linearity for analog TV signal handling
Optimized for 75 Ω systems	Specified G_UM and F at Z_S = 60 Ω and RL = 75 Ω - matches broadcast video impedance standards
Thermally robust SOT23	R_{th j-s} = 260 K/W allows continuous 300 mW dissipation with Ts ≤ 70 °C on standard PCB copper
Low capacitance topology	C_c = 0.7 pF and C_re = 0.6 pF reduce parasitic coupling, easing layout for >500 MHz stability

Applications

TV Tuner Oscillators	UHF RF Preamplifiers
Use Scenario: Local oscillator in analog terrestrial TV tuners operating 470–862 MHz. IC Role / Device Role / Timing Role: NPN wideband transistor configured as Colpitts or Clapp oscillator core. Use Value: 2.8 GHz f_T and 13.5 dB G_UM ensure reliable start-up and phase noise compliance at channel edges.	Use Scenario: First-stage low-noise amplifier in TV antenna input circuits. IC Role / Device Role / Timing Role: Common-emitter RF amplifier with emitter degeneration for broadband matching. Use Value: 2.5 dB noise figure at 800 MHz preserves SNR in weak-signal reception before mixer stage.
CATV Signal Splitters	FM Radio Front-Ends
Use Scenario: Gain block in 5–1000 MHz CATV distribution amplifiers. IC Role / Device Role / Timing Role: Linear wideband amplifier with fixed 10 V bias and 75 Ω I/O termination. Use Value: VO = 150 mV intermodulation output confirms third-order intercept capability for multi-channel cable systems.	Use Scenario: RF amplifier in 87.5–108 MHz FM radio receivers. IC Role / Device Role / Timing Role: Common-base amplifier for improved high-frequency isolation and stability. Use Value: C_e = 1.25 pF and C_re = 0.6 pF minimize capacitive loading on tuned tank circuits.

TV Tuner Oscillators

UHF RF Preamplifiers

Use Scenario: Local oscillator in analog terrestrial TV tuners operating 470–862 MHz.

IC Role / Device Role / Timing Role: NPN wideband transistor configured as Colpitts or Clapp oscillator core.

Use Value: 2.8 GHz f_T and 13.5 dB G_UM ensure reliable start-up and phase noise compliance at channel edges.

Use Scenario: First-stage low-noise amplifier in TV antenna input circuits.

IC Role / Device Role / Timing Role: Common-emitter RF amplifier with emitter degeneration for broadband matching.

Use Value: 2.5 dB noise figure at 800 MHz preserves SNR in weak-signal reception before mixer stage.

CATV Signal Splitters

FM Radio Front-Ends

Use Scenario: Gain block in 5–1000 MHz CATV distribution amplifiers.

IC Role / Device Role / Timing Role: Linear wideband amplifier with fixed 10 V bias and 75 Ω I/O termination.

Use Value: VO = 150 mV intermodulation output confirms third-order intercept capability for multi-channel cable systems.

Use Scenario: RF amplifier in 87.5–108 MHz FM radio receivers.

IC Role / Device Role / Timing Role: Common-base amplifier for improved high-frequency isolation and stability.

Use Value: C_e = 1.25 pF and C_re = 0.6 pF minimize capacitive loading on tuned tank circuits.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN RF transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BFS17,215	Same die, but marked E2 and packaged in SOT23 with identical pinout and electrical specs; no functional difference	Identical use in TV tuners and RF amps; same thermal and RF performance	Select BFS17,215 only if legacy BOM specifies that marking variant; electrically interchangeable
MRF901LT1	Higher f_T (4 GHz), lower noise figure (1.8 dB), but V_CEO = 12 V and P_tot = 225 mW - less voltage headroom, reduced power handling	Better for 1–2 GHz cellular front-ends; marginal for 15 V TV tuner supplies due to lower V_CEO	Choose MRF901LT1 only when higher frequency coverage or lower noise is prioritized over supply voltage margin

Compared with BFS17A,235, BFS17,215 offers identical RF performance and drop-in compatibility, while MRF901LT1 trades voltage robustness for extended bandwidth and lower noise - making it suitable only where 12 V operation and tighter noise budgets dominate design requirements.

Availability

BFS17A,235 is available at Aetrix Electronics and suitable for TV tuner designs, CATV distribution amplifiers, FM radio receivers, and UHF RF preamplifiers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BFS17A,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 specializing in high-performance RF, analog, and mixed-signal solutions for consumer, industrial, and communications markets.

The BFS17A,235 belongs to NXP's legacy discrete RF transistor family, engineered specifically for analog broadcast receiver applications including TV and FM tuners where wideband gain, low noise, and thermal reliability in SOT23 are essential.

FAQ

What is the maximum operating frequency of the BFS17A,235?

The BFS17A,235 has a transition frequency (f_T) of 2.8 GHz, measured at I_C = 25 mA and V_CE = 5 V. This defines its upper small-signal amplification limit; practical oscillator and amplifier use extends reliably to 862 MHz (UHF TV band) with proper layout and biasing. The device is not characterized beyond 3 GHz in the official datasheet.

Is the BFS17A,235 suitable for automotive applications?

No - the BFS17A,235 is not automotive-qualified. Per NXP's datasheet disclaimers, it is intended for consumer TV and broadcast equipment only. It lacks AEC-Q101 qualification, has no guaranteed operation above 105 °C junction temperature, and is explicitly excluded from safety-critical or life-support systems.

What is the thermal resistance from junction to soldering point for BFS17A,235?

The BFS17A,235 has a thermal resistance R_{th j-s} of 260 K/W, defined from junction to the soldering point of the collector pin (Pin 3) under conditions where solder point temperature T_s ≤ 70 °C. This value assumes standard SOT23 PCB mounting with adequate copper pour on Pin 3.

Does the BFS17A,235 have a specified minimum h_FE at high current?

Yes - the BFS17A,235 guarantees h_FE ≥ 25 at both I_C = 2 mA and I_C = 25 mA, with V_CE = 1 V and T_amb = 25 °C. This dual-current specification ensures consistent DC bias stability across low-power oscillator and higher-drive amplifier operating points.

Can the BFS17A,235 replace the BFS17 in existing designs?

Yes - the BFS17A,235 is a direct revision of the BFS17 with identical pinout, package, and electrical specifications. The "A" suffix denotes minor process or test enhancements; all key parameters (f_T, F, G_UM, V_CEO, P_tot) remain unchanged, and the marking code E2p confirms full backward compatibility.

BFS17A,235 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Voltage - Collector Emitter Breakdown (Max):: 15V

Frequency - Transition:: 2.8GHz

Noise Figure (dB Typ @ f):: 2.5dB @ 800MHz

Gain:: -

Power - Max:: 300mW

DC Current Gain (hFE) (Min) @ Ic, Vce:: 25 @ 2mA, 1V

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

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23 (TO-236AB)

BFS17A,235 FAQ

1.How can I place an order for BFS17A,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BFS17A,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 BFS17A,235 reliable?

The price and inventory of BFS17A,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BFS17A,235 is usually 5 days.

3.What payment methods are accepted for BFS17A,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BFS17A,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BFS17A,235?

BFS17A,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BFS17A,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 BFS17A,235?

For technical support, including BFS17A,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BFS17A,235 requirements.

6.How does Aetrix verify that BFS17A,235 is sourced from the original manufacturer or authorized distributors?

All BFS17A,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 BFS17A,235 meets industry standards.

7.What is the process for return or replacement of BFS17A,235?

All BFS17A,235 units undergo pre-shipment inspection (PSI). If there is an issue with BFS17A,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 BFS17A,235 part is unused and in its original packaging.

Return procedure for BFS17A,235:

1.Submit a request within 90 days.

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

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