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

Nexperia USA Inc. BFS20,215

Name: BFS20,215
Brand: Nexperia USA Inc.
SKU: BFS20,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BFS20,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BFS20,215.pdf

Description:: TRANS NPN 20V 0.025A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:16,296

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Product details

Overview

BFS20,215 from Nexperia is an NPN medium-frequency transistor in SOT23 package, rated for V_CEO = 20 V, I_C(max) = 25 mA, and f_T = 275–450 MHz, with typical feedback capacitance of 350 fF; used in IF and VHF thick/thin-film circuits for signal amplification and switching.

For engineers reviewing the BFS20,215 datasheet, BFS20,215 pinout, BFS20,215 application, or BFS20,215 equivalent, key selection criteria include its low C_re, high f_T, DC current gain (h_FE = 40–85 at I_C = 7 mA), thermal resistance (R_th(j-a) = 500 K/W), and SOT23 footprint compatibility in space-constrained RF stages.

Technical Context

The BFS20,215 operates as a general-purpose NPN bipolar junction transistor optimized for medium-frequency analog signal paths. Its design emphasizes low feedback capacitance (C_re = 350 fF typ.) and high transition frequency (f_T ≥ 275 MHz), enabling stable gain in IF amplifier and VHF oscillator stages up to ~450 MHz.

It features a DC current gain range of 40–85 at I_C = 7 mA and V_CE = 10 V, with base-emitter voltage V_BE = 740–900 mV under same conditions. Thermal performance is defined for FR4 PCB mounting (R_th(j-a) = 500 K/W), supporting continuous operation up to T_j = 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - maximum collector-emitter voltage before breakdown under open-base condition
I_C(max)	25 mA - absolute DC collector current limit defining safe linear/switching operation
f_T	275–450 MHz - unity-gain frequency indicating usable bandwidth for small-signal amplification
C_re	350 fF typ. - feedback capacitance determining stability margin and Miller effect in tuned amplifiers
h_FE	40–85 - DC current gain at I_C = 7 mA, V_CE = 10 V, critical for bias point stability
R_th(j-a)	500 K/W - junction-to-ambient thermal resistance on FR4 board, limiting power dissipation to 250 mW at T_amb ≤ 25 °C
V_BE	740–900 mV - forward base-emitter voltage drop at I_C = 7 mA, essential for accurate bias network design

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 electrode for current amplification; requires external bias network for active-region operation
2	Emitter	Current source terminal; typically grounded or connected to emitter degeneration resistor in amplifier designs
3	Collector	Output current terminal; connects to load impedance or next stage input in common-emitter configurations

Key Features

Feature	Design Value
Low feedback capacitance	350 fF typical - minimizes instability and phase shift in high-gain IF/VHF amplifiers
High transition frequency	275–450 MHz - supports broadband amplification up to VHF band without external neutralization
Stable DC current gain	h_FE = 40–85 at I_C = 7 mA - enables predictable biasing in discrete gain blocks
SOT23 footprint	Standardized 3-pin surface-mount package - ensures compatibility with automated assembly and compact PCB layouts
FR4-optimized thermal rating	R_th(j-a) = 500 K/W - defines derating curve for reliable operation on standard epoxy-glass boards

Applications

IF Amplifier Stage

VHF Oscillator Core

Use Scenario: Intermediate frequency amplification in AM/FM radio receivers and TV tuners operating at 455 kHz or 10.7 MHz.

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

Use Value: Low C_re prevents self-oscillation; f_T > 275 MHz ensures sufficient gain margin at IF frequencies.

Use Scenario: Colpitts or Clapp oscillator generating stable VHF signals (30–300 MHz) for wireless sensor transmitters.

IC Role / Device Role / Timing Role: Active gain element sustaining oscillation via positive feedback through LC tank network.

Use Value: High f_T and low C_re enable reliable start-up and spectral purity without neutralization.

Thin-Film RF Filter Driver

RF Signal Switching

Use Scenario: Driving ceramic or SAW filters in portable communication front-ends where impedance matching and linearity are critical.

IC Role / Device Role / Timing Role: Buffer amplifier isolating filter input from preceding mixer output impedance variations.

Use Value: Matched h_FE range and low V_BE variation ensure consistent drive level across production units.

Use Scenario: Transmit/receive (T/R) switching in low-power ISM-band modules (e.g., 433 MHz, 868 MHz).

IC Role / Device Role / Timing Role: Fast-switching NPN switch controlling RF path between antenna and transceiver IC.

Use Value: 25 mA I_C rating and 20 V V_CEO support moderate RF power handling with minimal insertion loss.

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	f_T = 100 MHz (lower); h_FE = 200–450 (higher); V_CEO = 65 V	Lower bandwidth limits use above 50 MHz; higher gain improves low-current bias stability	Select when higher V_CEO or lower I_C operation (<5 mA) is prioritized over VHF performance
MMBT2222ALT1G	f_T = 300 MHz (comparable); C_re = 5 pF (much higher); V_CEO = 40 V	Higher C_re degrades stability in tuned circuits; better voltage headroom for higher supply rails	Select only if V_CEO > 20 V is required and circuit topology tolerates increased feedback capacitance

Compared with BC846B,215 and MMBT2222ALT1G, the BFS20,215 uniquely balances VHF capability (f_T ≥ 275 MHz), ultra-low C_re (350 fF), and SOT23 compatibility-making it optimal for stable, high-frequency discrete amplifiers where neutralization is impractical.

Availability

BFS20,215 is available at Aetrix Electronics and suitable for IF amplifiers, VHF oscillators, thin-film RF filter drivers, and RF signal switching requiring stable component supply across industrial and consumer electronics programs.

Supply support for BFS20,215 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

Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, consumer, and wearable markets with high-volume, high-reliability components.

The BFS20,215 belongs to Nexperia's legacy NXP Standard Products portfolio of general-purpose bipolar transistors, designed specifically for medium-frequency analog signal conditioning in cost-sensitive, space-constrained RF subsystems.

FAQ

Is BFS20,215 suitable for RF power amplification?

No. The BFS20,215 is rated for I_C(max) = 25 mA and P_tot = 250 mW on FR4, making it appropriate for small-signal amplification and switching-not power amplification. Its f_T and low C_re support gain up to ~450 MHz, but output power capability is limited to milliwatt-level stages.

What is the marking code for BFS20,215 on the SOT23 package?

The BFS20,215 is marked "G1" on the top surface of the SOT23 package, followed by a country-of-manufacture indicator: "p" for Hong Kong, "t" for Malaysia, or "W" for China. This matches the official Nexperia marking specification for this device.

Can BFS20,215 replace BFS17 or BFS18 in existing designs?

No direct replacement: BFS17 (f_T ≈ 1 GHz) and BFS18 (f_T ≈ 700 MHz) offer significantly higher transition frequencies and different gain/bandwidth trade-offs. BFS20,215 provides lower f_T but superior C_re control (350 fF vs. ~1 pF), so substitution requires re-evaluation of stability and gain margins.

Does BFS20,215 require a heatsink in standard SOT23 mounting?

No. With R_th(j-a) = 500 K/W and P_tot = 250 mW at T_amb ≤ 25 °C, junction temperature rise is ≤125 K-within the 150 °C T_j limit-when mounted on standard FR4. No heatsink is needed unless ambient exceeds 25 °C or power dissipation approaches derated limits.

BFS20,215 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):: 25 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:: 40 @ 7mA, 10V

Power - Max:: 250 mW

Frequency - Transition:: 450MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BFS20,215 FAQ

1.How can I place an order for BFS20,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BFS20,215 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 BFS20,215 reliable?

The price and inventory of BFS20,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BFS20,215 is usually 5 days.

3.What payment methods are accepted for BFS20,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BFS20,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BFS20,215?

BFS20,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BFS20,215 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 BFS20,215?

For technical support, including BFS20,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BFS20,215 requirements.

6.How does Aetrix verify that BFS20,215 is sourced from the original manufacturer or authorized distributors?

All BFS20,215 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 BFS20,215 meets industry standards.

7.What is the process for return or replacement of BFS20,215?

All BFS20,215 units undergo pre-shipment inspection (PSI). If there is an issue with BFS20,215, 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 BFS20,215 part is unused and in its original packaging.

Return procedure for BFS20,215:

1.Submit a request within 90 days.

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

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