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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > Single FETs, MOSFETs

NXP Semiconductors BF862,215

Name: BF862,215
Brand: NXP Semiconductors
SKU: BF862,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BF862,215

Manufacturer:: NXP Semiconductors

Category:: Single FETs, MOSFETs

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

Datasheet:: BF862,215.pdf

Description:: RF MOSFET JFET SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:3,927

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Product details

Overview

BF862,215 from NXP Semiconductors is a silicon N-channel symmetrical junction field-effect transistor (JFET) in SOT23 package, with drain-source voltage rating of 20 V, gate-source cut-off voltage of −0.3 to −1.2 V, and typical transfer admittance of 45 mS. It delivers 715 MHz transition frequency and 0.8 nV/√Hz input noise voltage, optimized for low-noise RF pre-amplification in AM car radio front-ends.

For engineers reviewing the BF862,215 datasheet, BF862,215 pinout, BF862,215 application, or BF862,215 equivalent, key selection criteria include its high yfs, ultra-low noise performance, symmetrical source/drain configuration, and thermal resistance of 200 K/W referenced to the gate lead soldering point.

Technical Context

The BF862,215 operates as a depletion-mode JFET with interchangeable source and drain terminals, enabling flexible biasing in common-source or common-gate configurations. Its symmetrical structure supports bidirectional signal flow and simplifies layout in single-ended RF amplifiers.

Designed for high-frequency analog front-ends, it exhibits strong correlation between IDSS (10–25 mA) and yfs (35–45 mS), with fT maintained at 715 MHz under VDS = 8 V, VGS = 0, and Tamb = 25 °C - confirming suitability for AM band RF gain stages where noise and gain stability are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	20 V maximum - defines safe DC operating range for AM radio supply rails and signal swing handling.
V_GS(off)	−0.3 to −1.2 V - sets gate bias window for reliable depletion-mode cutoff and linear region control.
\|y_fs\|	45 mS typical - provides high transconductance for stable small-signal voltage gain in tuned pre-amplifiers.
f_T	715 MHz - ensures sufficient bandwidth margin for AM IF and RF stages up to 1.6 MHz carrier with harmonic suppression.
e_n	0.8 nV/√Hz at 100 kHz - enables high signal-to-noise ratio in weak-signal reception without added front-end noise degradation.
R_{th j–s}	200 K/W - thermal resistance referenced to gate lead soldering point, requiring careful PCB copper pour design on gate trace for reliability.
P_tot	300 mW at T_s ≤ 90 °C - power limit governed by junction temperature cap of 150 °C and thermal path via gate lead.

Pinout & Package

BF862,215 is housed in a plastic surface-mounted SOT23 (TO-236AB) package with 3 leads. Main heat transfer occurs via the gate lead per manufacturer note.

Pin/Terminal	Circuit Role	Design Meaning
1	Source	Interchangeable with drain; connects to RF ground or bias network in common-source amplifier topology.
2	Drain	Interchangeable with source; output node for gain stage, typically coupled to tuned LC load or next-stage input.
3	Gate	Signal input terminal; primary thermal path - requires robust copper connection and controlled soldering profile.

Key Features

Feature	Design Value
Symmetrical source/drain	Enables bidirectional operation and layout flexibility without polarity constraints in RF matching networks.
High \|y_fs\| (45 mS typ)	Delivers consistent small-signal gain across production lots, reducing need for post-layout gain trimming.
Low e_n (0.8 nV/√Hz)	Preserves weak AM signal integrity in first-stage amplification, directly improving receiver sensitivity.
f_T = 715 MHz	Provides >400× bandwidth margin over AM broadcast band (0.53–1.6 MHz), ensuring flat gain and phase response.

Applications

AM Car Radio RF Pre-amplifier	Low-Noise IF Amplifier Stage
Use Scenario: Amplifying weak antenna-coupled RF signals before mixer conversion in automotive AM receivers. IC Role / Device Role / Timing Role: N-channel JFET configured as common-source voltage amplifier with tuned input/output impedance matching. Use Value: 0.8 nV/√Hz input noise and 45 mS transconductance maintain SNR >45 dB at 1 MHz while supporting 20 dB gain stability across temperature.	Use Scenario: Boosting intermediate frequency signals at 455 kHz after mixing, prior to detection and audio processing. IC Role / Device Role / Timing Role: Depletion-mode JFET used in fixed-bias common-source configuration with parallel LC tank feedback. Use Value: Symmetrical source/drain allows simplified bias network design, and 715 MHz f_T ensures minimal phase distortion at IF frequencies.
Portable AM Receiver Front-End	RF Signal Monitoring Probe
Use Scenario: Low-power, battery-operated handheld AM radios requiring minimal quiescent current and high sensitivity. IC Role / Device Role / Timing Role: Junction FET operating at IDSS ≈ 15 mA, leveraging high yfs for gain without active bias circuitry. Use Value: 300 mW power dissipation limit and 150 °C junction rating support continuous operation in compact enclosures with passive cooling.	Use Scenario: Non-invasive RF sampling probe for spectrum analysis or EMI debugging in AM-band equipment. IC Role / Device Role / Timing Role: High-impedance gate input used in unity-gain buffer configuration to minimize circuit loading. Use Value: Reverse gate current <1 nA and Ciss = 10 pF enable wideband signal capture with <0.5 dB insertion loss below 10 MHz.

AM Car Radio RF Pre-amplifier

Low-Noise IF Amplifier Stage

Use Scenario: Amplifying weak antenna-coupled RF signals before mixer conversion in automotive AM receivers.

IC Role / Device Role / Timing Role: N-channel JFET configured as common-source voltage amplifier with tuned input/output impedance matching.

Use Value: 0.8 nV/√Hz input noise and 45 mS transconductance maintain SNR >45 dB at 1 MHz while supporting 20 dB gain stability across temperature.

Use Scenario: Boosting intermediate frequency signals at 455 kHz after mixing, prior to detection and audio processing.

IC Role / Device Role / Timing Role: Depletion-mode JFET used in fixed-bias common-source configuration with parallel LC tank feedback.

Use Value: Symmetrical source/drain allows simplified bias network design, and 715 MHz f_T ensures minimal phase distortion at IF frequencies.

Portable AM Receiver Front-End

RF Signal Monitoring Probe

Use Scenario: Low-power, battery-operated handheld AM radios requiring minimal quiescent current and high sensitivity.

IC Role / Device Role / Timing Role: Junction FET operating at IDSS ≈ 15 mA, leveraging high yfs for gain without active bias circuitry.

Use Value: 300 mW power dissipation limit and 150 °C junction rating support continuous operation in compact enclosures with passive cooling.

Use Scenario: Non-invasive RF sampling probe for spectrum analysis or EMI debugging in AM-band equipment.

IC Role / Device Role / Timing Role: High-impedance gate input used in unity-gain buffer configuration to minimize circuit loading.

Use Value: Reverse gate current <1 nA and Ciss = 10 pF enable wideband signal capture with <0.5 dB insertion loss below 10 MHz.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel JFET amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SK208-4-TB-E	Higher V_DS (30 V), lower y_fs (20 mS typ), TO-92 package - larger footprint and higher thermal resistance.	Used in general-purpose audio preamps; less optimized for AM RF due to lower f_T (120 MHz).	Select when higher voltage headroom is needed and board space permits through-hole mounting.
J310	V_GS(off) wider range (−0.5 to −4.0 V), lower f_T (25 MHz), same SOT23 package but non-symmetrical pinout (drain/source not interchangeable).	Common in hobbyist and low-cost AM receivers; lacks BF862,215's noise and bandwidth performance.	Choose only for cost-sensitive designs where 0.8 nV/√Hz noise and 715 MHz f_T are not required.

Compared with 2SK208-4-TB-E and J310, BF862,215 uniquely combines symmetrical source/drain terminals, 715 MHz f_T, and 0.8 nV/√Hz noise in SOT23 - making it the only option among the three qualified for high-sensitivity, space-constrained AM RF pre-amplification.

Availability

BF862,215 is available at Aetrix Electronics and suitable for AM car radio front-ends, portable receiver designs, and RF monitoring probes requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for BF862,215 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 automotive, industrial, and consumer applications.

The BF862,215 belongs to NXP's legacy discrete RF JFET product line, engineered specifically for low-noise, high-gain amplification in AM broadcast band receivers where thermal stability and noise floor are critical.

FAQ

What is the gate-source cut-off voltage range for BF862,215?

The BF862,215 has a gate-source cut-off voltage (V_GS(off)) range of −0.3 V to −1.2 V at V_DS = 8 V and I_D = 1 μA. This depletion-mode specification ensures predictable turn-off behavior in bias networks and supports stable DC operating points in common-source amplifier designs using the BF862,215.

Is BF862,215 suitable for surface-mount assembly with standard reflow profiles?

Yes, BF862,215 uses the SOT23 package and is qualified for standard lead-free reflow processes. However, because main heat transfer occurs via the gate lead (Pin 3), thermal relief and copper pour on that net must follow NXP's recommended layout guidelines to avoid exceeding the 150 °C junction temperature limit during operation or soldering.

Can source and drain terminals be swapped in BF862,215 circuits?

Yes - the BF862,215 is explicitly specified as a symmetrical junction FET, meaning source and drain are electrically interchangeable. This allows flexible PCB layout and eliminates polarity concerns in RF matching networks, provided gate remains Pin 3 and biasing respects the depletion-mode V_GS(off) range.

What is the typical transition frequency (f_T) of BF862,215 and under what conditions is it measured?

The BF862,215 has a typical transition frequency (f_T) of 715 MHz, measured under common-source configuration at T_amb = 25 °C, V_DS = 8 V, and V_GS = 0 V. This value confirms its capability to deliver flat gain and minimal phase shift across the entire AM broadcast band (0.53–1.6 MHz) with substantial bandwidth margin.

How does the noise performance of BF862,215 compare to other JFETs in SOT23 packages?

The BF862,215 achieves an equivalent input noise voltage (e_n) of 0.8 nV/√Hz at 100 kHz - among the lowest published values for production SOT23-packaged JFETs. This outperforms alternatives like J310 (e_n ≈ 3–5 nV/√Hz) and enables superior weak-signal reception in AM radio front-ends using the BF862,215.

BF862,215 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

Technology:: JFET

Configuration:: N-Channel

Frequency:: -

Gain:: -

Voltage - Test:: -

Current Rating (Amps):: 25mA

Noise Figure:: -

Current - Test:: -

Power - Output:: -

Voltage - Rated:: 20 V

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

BF862,215 FAQ

1.How can I place an order for BF862,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BF862,215 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 BF862,215 reliable?

The price and inventory of BF862,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF862,215 is usually 5 days.

3.What payment methods are accepted for BF862,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF862,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF862,215?

BF862,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF862,215 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 BF862,215?

For technical support, including BF862,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF862,215 requirements.

6.How does Aetrix verify that BF862,215 is sourced from the original manufacturer or authorized distributors?

All BF862,215 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 BF862,215 meets industry standards.

7.What is the process for return or replacement of BF862,215?

All BF862,215 units undergo pre-shipment inspection (PSI). If there is an issue with BF862,215, 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 BF862,215 part is unused and in its original packaging.

Return procedure for BF862,215:

1.Submit a request within 90 days.

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

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