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NXP Semiconductors BF861C,215
- Part No.:
- BF861C,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Single FETs, MOSFETs
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BF861C,215.pdf
- Description:
- RF MOSFET JFET SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,799
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Product details
Overview
BF861C,215 from NXP Semiconductors is an N-channel symmetrical junction field-effect transistor (JFET) in SOT23 package, designed for low-noise RF and audio preamplifier stages. It delivers IDSS = 12–25 mA, |yfs| = 20–30 mS, and ultra-low Crss = 2.1–2.7 pF at 1 MHz, enabling high-gain, low-feedback amplification in AM tuner front-ends.
For engineers reviewing the BF861C,215 datasheet, BF861C,215 pinout, BF861C,215 application, or BF861C,215 equivalent, this device is selected for its verified low-noise performance (1.5 nV/√Hz), tight gate cutoff voltage range (−0.8 to −2 V), and stable operation up to 150 °C junction temperature in compact automotive and portable radio designs.
Technical Context
The BF861C,215 operates as a depletion-mode N-channel JFET with symmetrical source/drain terminals, requiring zero-bias gate control for linear amplification. Its junction-based structure provides inherent thermal stability and no threshold voltage drift over time.
Designed for small-signal RF and audio applications, it features low input capacitance (Ciss ≤ 10 pF) and minimal reverse transfer capacitance (Crss ≤ 2.7 pF), reducing Miller effect and enabling wideband gain flatness without neutralization circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IDSS | 12–25 mA at VGS = 0 V, VDS = 8 V - sets DC bias point and gain headroom in common-source amplifier stages |
| |yfs| | 20–30 mS at VGS = 0 V, VDS = 8 V - determines small-signal transconductance and voltage gain (Av ≈ yfs × RL) |
| VGSoff | −0.8 to −2 V at ID = 1 μA - defines gate voltage required to pinch off channel; enables precise bias network design |
| Ciss / Crss | ≤10 pF / ≤2.7 pF at 1 MHz - minimizes capacitive loading and feedback, supporting stable >100 MHz operation |
| Vn/√B | 1.5 nV/√Hz at 1 MHz - specifies intrinsic noise floor for high-SNR preamplifier design in weak-signal reception |
| Ptot | 250 mW at Tamb = 25 °C - limits maximum dissipation; requires thermal derating above 25 °C ambient per Rth(j-a) = 500 K/W |
| VDS max | 25 V DC - defines safe drain-source voltage swing for AM tuner IF and RF stage operation |
Pinout & Package
SOT23 plastic surface-mounted package (TO-236AB), 3-lead, dimensions per JEDEC outline: D = 2.9 mm, E = 1.3 mm, Lp = 1.2 mm, bp = 0.48 mm, c = 0.38 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Source | Reference node for gate bias; symmetrical with drain - allows flexible common-source or common-gate configuration |
| 2 | Drain | Output current terminal; connects to load resistor or next stage; must be DC-decoupled in RF applications |
| 3 | Gate | High-impedance control terminal; requires ESD protection during handling; biased via high-value resistor to set VGS |
Key Features
| Feature | Design Value |
|---|---|
| Low noise figure | 1.5 nV/√Hz at 1 MHz - enables detection of weak AM signals without degrading SNR in tuner front-ends |
| High forward transfer admittance | 20–30 mS - delivers high voltage gain with modest load impedances (e.g., 1–5 kΩ) |
| Low feedback capacitance | Crss ≤ 2.7 pF - suppresses instability and oscillation in broadband amplifiers without neutralization |
| Symmetrical junction structure | Source/drain interchangeable - simplifies PCB layout and supports dual-role circuit topologies |
| ESD-protected packaging | Antistatic SOT23 tape-and-reel - prevents gate oxide damage during automated assembly and handling |
Applications
| AM Radio Tuner Preamplifier | RF Signal Conditioning Stage |
|---|---|
Use Scenario: Front-end amplification of weak AM band signals (530–1710 kHz) in automotive head units before mixer stage. IC Role / Device Role / Timing Role: Low-noise voltage-controlled current source in common-source configuration. Use Value: 1.5 nV/√Hz noise floor preserves signal integrity; 20–30 mS transconductance enables >20 dB gain with 2.2 kΩ collector load. |
Use Scenario: Wideband RF buffer and impedance matching between antenna interface and SAW filter in portable radios. IC Role / Device Role / Timing Role: High-input-impedance, low-Crss active buffer isolating sensitive front-end nodes. Use Value: Crss ≤ 2.7 pF minimizes coupling from output to input; Ciss ≤ 10 pF maintains bandwidth >100 MHz with 50 Ω source. |
| Audio Input Buffer | Low-Drift Sensor Interface |
Use Scenario: High-fidelity microphone or phono preamp stage where DC offset and thermal drift must be minimized. IC Role / Device Role / Timing Role: Depletion-mode JFET providing zero-bias, self-stabilizing gain with no gate current. Use Value: VGSoff = −0.8 to −2 V enables stable DC bias using single-resistor gate network; IGSS ≤ −1 nA ensures negligible gate leakage over temperature. |
Use Scenario: Amplifying low-level outputs from piezoelectric or thermopile sensors in industrial monitoring equipment. IC Role / Device Role / Timing Role: Ultra-low-noise, high-Z input stage preserving microvolt-level signal integrity. Use Value: 1.5 nV/√Hz noise performance exceeds typical op-amps below 10 kHz; Tj max = 150 °C supports operation in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise JFET amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BF862,215 | Higher IDSS (15–35 mA), lower VGSoff (−1.5 to −3 V), same SOT23 package | Better suited for higher-gain, higher-current bias points; may require gate resistor adjustment | Select when >25 mS transconductance or wider VGSoff spread is needed for production tolerance margin |
| J310G | Lower IDSS (24–60 mA typ), higher Crss (4.5 pF), TO-92 package only | Larger footprint; less suitable for space-constrained automotive PCBs; higher feedback capacitance limits RF bandwidth | Choose only for through-hole prototyping or legacy board reuse where SOT23 is unavailable |
Compared with BF861C,215, BF862,215 offers higher transconductance but tighter gate control requirements, while J310G trades RF performance for mechanical compatibility - BF861C,215 remains optimal for SOT23-constrained, low-noise AM tuner designs demanding <2.7 pF Crss and 1.5 nV/√Hz noise.
Availability
BF861C,215 is available at Aetrix Electronics and suitable for automotive infotainment systems, portable radio receivers, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BF861C,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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.
The BF861C,215 belongs to NXP's discrete RF JFET product line, engineered specifically for low-noise, high-linearity analog front-ends in broadcast receiver systems where thermal stability and ESD robustness are critical.
FAQ
What is the maximum drain-source voltage rating for BF861C,215?
The BF861C,215 has a maximum drain-source voltage (VDS) rating of 25 V DC, as specified in Table 5 (Limiting Values) of the NXP datasheet Rev. 5. This rating applies under continuous DC conditions with the device mounted on an FR4 PCB and defines the absolute upper limit before risk of avalanche breakdown or permanent damage.
Does BF861C,215 require external gate protection in circuit?
Yes - although BF861C,215 is supplied in an antistatic package, its gate-source junction is highly sensitive to electrostatic discharge. The datasheet explicitly cautions that "the gate-source input must be protected against static discharge during transport or handling." In-circuit, a series gate resistor (typically 10–100 kΩ) and/or parallel Zener clamp is recommended to prevent transient overvoltage events.
What is the typical input noise voltage of BF861C,215 and at what frequency is it measured?
The BF861C,215 has a typical equivalent input noise voltage (Vn/√B) of 1.5 nV/√Hz, measured at 1 MHz under standard test conditions (Tj = 25 °C, VDS = 8 V, VGS = 0 V), as stated in Table 7 of the NXP datasheet. This value reflects its suitability for high-fidelity, low-noise amplification in AM tuner and sensor interface applications.
How does the BF861C,215 differ from BF861A and BF861B variants?
The BF861C,215 differs from BF861A and BF861B in key DC parameters: it has higher IDSS (12–25 mA vs. 2–6.5 mA and 6–15 mA), higher |yfs| (20–30 mS vs. 12–20 mS and 16–25 mS), and more negative VGSoff (−0.8 to −2 V vs. −0.2 to −1 V and −0.5 to −1.5 V). These differences make BF861C,215 optimal for higher-gain, higher-current preamplifier stages.
Is BF861C,215 qualified for automotive applications per AEC-Q101?
No - the NXP datasheet explicitly states: "Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use." BF861C,215 is not AEC-Q101 qualified, and its qualification status is listed as "Production" but non-automotive. For automotive deployment, formal qualification testing by the end customer is required.
BF861C,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:
- 25 V
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23 (TO-236AB)
BF861C,215 FAQ
1.How can I place an order for BF861C,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF861C,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 BF861C,215 reliable?
The price and inventory of BF861C,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF861C,215 is usually 5 days.
3.What payment methods are accepted for BF861C,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF861C,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF861C,215?
BF861C,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF861C,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 BF861C,215?
For technical support, including BF861C,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF861C,215 requirements.
6.How does Aetrix verify that BF861C,215 is sourced from the original manufacturer or authorized distributors?
All BF861C,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 BF861C,215 meets industry standards.
7.What is the process for return or replacement of BF861C,215?
All BF861C,215 units undergo pre-shipment inspection (PSI). If there is an issue with BF861C,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 BF861C,215 part is unused and in its original packaging.
Return procedure for BF861C,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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