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

Nexperia USA Inc. BFS19,235

Name: BFS19,235
Brand: Nexperia USA Inc.
SKU: BFS19,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BFS19,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BFS19,235.pdf

Description:: TRANS NPN 20V 0.03A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:6,114

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Product details

Overview

BFS19,235 from Nexperia is an NPN medium-frequency transistor in SOT23 package, rated for V_CEO = 20 V, I_C(max) = 30 mA, and f_T = 260 MHz, with DC current gain h_FE of 65–225 at I_C = 1 mA. It serves as a general-purpose amplifier or switch in thin-film RF front-ends and signal conditioning stages.

For engineers reviewing the BFS19,235 datasheet, BFS19,235 pinout, BFS19,235 application, or BFS19,235 equivalent, key selection criteria include its 260 MHz transition frequency, 250 mW power dissipation on FR4, SOT23 thermal resistance of 500 K/W, and verified operation up to +150 °C junction temperature.

Technical Context

The BFS19,235 operates as a silicon NPN bipolar junction transistor optimized for medium-frequency amplification and switching. Its f_T of 260 MHz and low feedback capacitance (C_re = 0.85 pF) support stable gain in VHF-band signal paths. The device uses standard planar epitaxial process and is characterized at T_j = 25 °C unless otherwise specified.

It features low V_BE (650–740 mV at I_C = 1 mA), tight h_FE spread (65–225), and low leakage: ICBO ≤ 100 nA at 20 V and 25 °C. Thermal performance is defined for mounting on FR4 PCB, with R_th(j-a) = 500 K/W.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - maximum safe collector-emitter voltage under open-base condition
f_T	260 MHz - usable small-signal amplification bandwidth at I_C = 1 mA, V_CE = 10 V
h_FE	65–225 - DC current gain range enabling predictable biasing in linear amplifier designs
P_tot	250 mW - total power dissipation limit on FR4 board at T_amb ≤ 25 °C
C_c	1 pF - collector capacitance at V_CB = 10 V, critical for tuning stability in resonant circuits
R_th(j-a)	500 K/W - junction-to-ambient thermal resistance defining required PCB copper area for thermal management

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-lead, dimensions per JEDEC outline: 2.9 × 1.3 × 1.0 mm (L × W × H), with 0.95 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-active biasing; requires current-limited drive to avoid saturation delay
2	Emiter	Common reference node in common-emitter configuration; connected to ground or signal return path
3	Collector	Output current sink node; routed to load or next stage with minimal trace inductance for RF integrity

Key Features

Feature	Design Value
Medium-frequency optimization	f_T = 260 MHz enables stable amplification up to ~100 MHz with adequate gain margin
Low feedback capacitance	C_re = 0.85 pF minimizes unwanted coupling in high-gain amplifier stages
Wide h_FE range	65–225 supports production binning and allows design margin for worst-case β variation
High-temperature capability	Junction rating up to +150 °C supports operation in sealed industrial enclosures without forced cooling

Applications

FM Radio Front-End Amplifier

RF Signal Generator Output Stage

Use Scenario: Amplifying 88–108 MHz FM band signals before demodulation in portable receivers.

IC Role / Device Role / Timing Role: NPN medium-frequency amplifier in common-emitter configuration with tuned collector load.

Use Value: 260 MHz f_T ensures sufficient gain margin across full FM band; low C_c preserves filter Q-factor.

Use Scenario: Buffering and level-shifting low-power RF output from DDS-based signal generators.

IC Role / Device Role / Timing Role: Linear driver transistor delivering 10–20 mA into 50 Ω load at 30–100 MHz.

Use Value: Tight V_BE tolerance (650–740 mV) enables repeatable DC bias setting; SOT23 footprint eases RF layout.

Thin-Film Oscillator Core

Industrial Sensor Signal Conditioning

Use Scenario: Active element in Colpitts oscillator for local clock generation in analog sensor modules.

IC Role / Device Role / Timing Role: Gain device sustaining oscillation via phase-shifted feedback network.

Use Value: Low C_re (0.85 pF) reduces phase noise contribution; h_FE spread accommodates production variance in loop gain.

Use Scenario: Amplifying low-level thermocouple or bridge sensor outputs in factory-floor transmitters.

IC Role / Device Role / Timing Role: DC-coupled preamplifier stage with emitter degeneration for linearity.

Use Value: ICBO ≤ 100 nA at 25 °C prevents input offset drift; +150 °C T_j rating supports uncooled industrial ambient.

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
BC846B,215	Higher h_FE (200–450), same SOT23, f_T = 250 MHz, V_CEO = 65 V	Higher voltage headroom but lower f_T; less suitable for >100 MHz narrowband amplifiers	Select when higher DC gain and voltage margin outweigh frequency needs
MMBT2222ALT1G	f_T = 300 MHz, V_CEO = 40 V, h_FE = 100–300, same SOT23	Better high-frequency response and wider voltage range; higher P_tot (310 mW)	Preferred for broadband amplifiers requiring >200 MHz flat gain or higher supply rails

Compared with BC846B,215 and MMBT2222ALT1G, the BFS19,235 offers tighter f_T consistency and lower C_re, making it preferable for tuned VHF-stage amplification where phase stability and minimal feedback matter more than raw gain or voltage rating.

Availability

BFS19,235 is available at Aetrix Electronics and suitable for FM radio front-ends, industrial sensor signal conditioning, and thin-film oscillator cores requiring stable component supply, consistent parametric binning, and long-term industrial lifecycle support.

Supply support for BFS19,235 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 BFS19,235 belongs to Nexperia's legacy NPN RF transistor product line, designed specifically for medium-frequency amplification and switching in space-constrained, cost-sensitive analog signal chains.

FAQ

Is BFS19,235 suitable for RF amplifier designs above 100 MHz?

Yes - its f_T of 260 MHz and low feedback capacitance (0.85 pF) support stable gain in narrowband amplifiers up to ~100 MHz. For broadband or >150 MHz use, consider MMBT2222ALT1G (f_T = 300 MHz). Performance depends on proper biasing, layout, and matching networks.

What is the maximum continuous collector current for BFS19,235?

The absolute maximum DC collector current is 30 mA per limiting values table. At this current and T_amb = 25 °C, power dissipation reaches 250 mW - the rated P_tot. Derating is required above 25 °C ambient; consult R_th(j-a) = 500 K/W for thermal design.

Does BFS19,235 have a Pb-free and RoHS-compliant version?

Yes - all current BFS19,235 production is RoHS-compliant and halogen-free, consistent with Nexperia's standard manufacturing policy since 2006. The SOT23 package uses matte tin (Sn) lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1.

Can BFS19,235 replace BFS17 or BFS20 in existing designs?

Not directly - BFS17 has V_CEO = 15 V and f_T = 200 MHz; BFS20 has V_CEO = 25 V and f_T = 280 MHz. While pin-compatible, differences in gain, capacitance, and voltage rating require verification of bias point stability and frequency response in the target circuit.

BFS19,235 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):: 30 mA

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 65 @ 1mA, 10V

Power - Max:: 250 mW

Frequency - Transition:: 260MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BFS19,235 FAQ

1.How can I place an order for BFS19,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BFS19,235 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 BFS19,235 reliable?

The price and inventory of BFS19,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BFS19,235 is usually 5 days.

3.What payment methods are accepted for BFS19,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BFS19,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BFS19,235?

BFS19,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BFS19,235 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 BFS19,235?

For technical support, including BFS19,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BFS19,235 requirements.

6.How does Aetrix verify that BFS19,235 is sourced from the original manufacturer or authorized distributors?

All BFS19,235 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 BFS19,235 meets industry standards.

7.What is the process for return or replacement of BFS19,235?

All BFS19,235 units undergo pre-shipment inspection (PSI). If there is an issue with BFS19,235, 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 BFS19,235 part is unused and in its original packaging.

Return procedure for BFS19,235:

1.Submit a request within 90 days.

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

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