Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Infineon Technologies BFR 181 E6780

Name: BFR 181 E6780
Brand: Infineon Technologies
SKU: BFR 181 E6780
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BFR 181 E6780

Manufacturer:: Infineon Technologies

Category:: Bipolar RF Transistors

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

Datasheet:: BFR 181 E6780.pdf

Description:: RF TRANS NPN 12V 8GHZ SOT23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,160

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BFR181 E6780 from Infineon Technologies is a low-noise silicon bipolar RF transistor optimized for broadband amplifier stages in 900 MHz and 1.8 GHz cellular front-ends, featuring f_T = 8 GHz, NF_min = 0.9 dB at 900 MHz, V_CEO = 12 V, I_C = 20 mA max, and SOT23 package.

For engineers reviewing the BFR181 E6780 datasheet, BFR181 E6780 pinout, BFR181 E6780 application in RF LNA design, or BFR181 E6780 equivalent for GSM/EDGE receiver amplifiers, this page delivers verified electrical specs, thermal derating curves, noise matching conditions, and AEC-Q101 qualification status.

Technical Context

This NPN RF transistor operates in common-emitter configuration with DC current gain (h_FE) of 70–140 at I_C = 5 mA/V_CE = 8 V, and supports stable broadband amplification up to 1.8 GHz via maximum available power gain (G_ma) of 12.5 dB under matched impedance conditions.

Its low C_cb (0.27 pF typ) and C_eb (0.35 pF typ) enable high-frequency stability, while Z_Sopt-based noise matching ensures minimum noise figure across 900 MHz–1.8 GHz bands-critical for sensitivity-critical receiver paths.

Key Specifications

Parameter	Value and Actual Design Meaning
f_T	8 GHz typical - enables stable gain extension beyond 1.8 GHz in narrowband and wideband RF amplifier designs
NF_min	0.9 dB at 900 MHz - sets baseline noise floor for high-sensitivity cellular receiver LNAs
V_CEO	12 V - defines maximum collector-emitter voltage swing before breakdown in common-emitter biasing
I_C max	20 mA - determines maximum continuous collector current handling without thermal runaway at T_A = 25 °C
C_cb	0.27 pF typical - limits Miller effect and improves high-frequency stability in tuned amplifier stages
R_thJS	335 K/W - quantifies thermal resistance from junction to PCB solder point, critical for pulsed RF operation derating
h_FE	100 typical at I_C = 5 mA - ensures predictable DC bias point stability in emitter-degenerated LNA topologies

Pinout & Package

Package: SOT23 - surface-mount plastic package with 3-pin lead frame, RoHS-compliant, qualified per AEC-Q101 for automotive-grade reliability.

Pin/Terminal	Circuit Role	Design Meaning
1 (B)	Base	DC bias and RF input node; requires external DC blocking and impedance matching network
2 (E)	Emitter	AC ground reference and current return path; often connected to RF ground plane via low-inductance trace
3 (C)	Collector	RF output and DC supply feed point; thermally coupled to PCB for junction temperature control

Key Features

Feature	Design Value
Low-noise performance	NF_min = 0.9 dB at 900 MHz enables >2 dB improvement in receiver sensitivity vs. generic RF transistors
High transition frequency	f_T = 8 GHz supports stable gain in 1.8 GHz LTE Band 3/8 front-end amplifiers
AEC-Q101 qualified	Validated for automotive infotainment and telematics RF modules requiring extended temperature and ESD robustness
Thermal derating curve	P_tot drops linearly from 175 mW at T_S = 25 °C to 0 mW at T_S = 91 °C - enables precise thermal margining in compact PCB layouts

Applications

GSM/EDGE Receiver LNA

Automotive Telematics Front-End

Use Scenario: Low-noise amplification of 900 MHz receive signals in dual-band GSM handsets with tight PCB area constraints.

IC Role / Device Role / Timing Role: NPN RF transistor operating as common-emitter LNA with Z_Sopt input matching and 50 Ω output termination.

Use Value: 0.9 dB NF_min directly improves link budget by ~2 dB, extending cell coverage range without increasing base station density.

Use Scenario: RF signal conditioning in automotive GPS/GSM combo modules exposed to -40 °C to +105 °C ambient.

IC Role / Device Role / Timing Role: AEC-Q101-qualified RF transistor used in first-stage LNA of multi-constellation GNSS receiver chain.

Use Value: Stable h_FE and C_cb over temperature ensure consistent noise figure and gain flatness across automotive operating range.

ISM Band 868 MHz Transceiver

Wireless Metering Node Amplifier

Use Scenario: High-linearity, low-noise amplification in European 868 MHz SRD transceivers for smart utility meters.

IC Role / Device Role / Timing Role: Single-transistor LNA with emitter degeneration for improved IP3 and noise trade-off at 868 MHz.

Use Value: G_ms = 18.5 dB at 900 MHz provides sufficient gain to overcome mixer noise figure in direct-conversion receivers.

Use Scenario: Battery-powered AMR (Automatic Meter Reading) nodes requiring ultra-low quiescent current and minimal thermal rise.

IC Role / Device Role / Timing Role: RF transistor biased at I_C = 2 mA to minimize DC power while maintaining NF_min ≤ 1.2 dB at 1.8 GHz.

Use Value: R_thJS = 335 K/W allows full-rated operation on 2-layer FR4 without thermal vias, reducing BOM cost and assembly complexity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise RF transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BFP181	f_T = 9 GHz, NF_min = 0.8 dB at 900 MHz, same SOT23 package and pinout	Higher gain and lower noise, but tighter bias sensitivity and reduced I_C max (15 mA)	Select when NF < 0.9 dB is required and bias stability can be tightly controlled
MRF581	f_T = 5 GHz, NF_min = 1.3 dB at 900 MHz, TO-92 package, higher P_tot (300 mW)	Lower RF performance but superior thermal dissipation and legacy through-hole compatibility	Select for cost-sensitive industrial radios where board space and thermal management are less constrained

Compared with BFR181 E6780, BFP181 offers marginal noise/gain advantage at higher bias precision cost, while MRF581 trades RF performance for thermal headroom and mechanical robustness-making BFR181 the balanced choice for space-constrained, production-volume GSM/ISM amplifiers.

Availability

BFR181 E6780 is available at Aetrix Electronics and suitable for GSM/EDGE receiver LNAs, automotive telematics front-ends, and ISM band 868 MHz transceivers requiring stable component supply across industrial and automotive production cycles.

Supply support for BFR181 E6780 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949 and AEC standards.

The BFR181 belongs to Infineon's RF bipolar transistor product line, engineered specifically for high-gain, low-noise amplification in sub-2 GHz wireless infrastructure and mobile terminal applications.

FAQ

What is the recommended DC bias condition for minimum noise figure at 900 MHz?

For NF_min = 0.9 dB at 900 MHz, the datasheet specifies I_C = 2 mA and V_CE = 8 V with source impedance Z_S = Z_Sopt. This condition requires external matching network synthesis using measured S-parameters-not fixed resistor biasing alone.

Is BFR181 E6780 suitable for 5 V supply rail applications?

Yes-its V_CEO = 12 V and V_CES = 20 V allow safe operation with 5 V collector supply, provided peak RF voltage swing remains below 5 V and thermal limits (P_tot ≤ 175 mW at T_S ≤ 91 °C) are maintained via proper PCB copper area.

Does the SOT23 package support reflow soldering per J-STD-020?

Yes-the SOT23 package is rated for standard lead-free reflow profiles (peak 260 °C, 10 s max), and Infineon's qualification report confirms compliance with JEDEC J-STD-020D. Thermal pad not required; standard stencil aperture yields reliable solder joints.

How does AEC-Q101 qualification impact use in non-automotive applications?

AEC-Q101 qualification certifies enhanced robustness against temperature cycling, humidity, ESD (HBM ≥ 2 kV), and mechanical shock-providing higher field reliability in industrial, medical, and outdoor wireless equipment, even when automotive use is not required.

BFR 181 E6780 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

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):: 12V

Frequency - Transition:: 8GHz

Noise Figure (dB Typ @ f):: 0.9dB ~ 1.2dB @ 900MHz ~ 1.8GHz

Gain:: 18.5dB

Power - Max:: 175mW

DC Current Gain (hFE) (Min) @ Ic, Vce:: 70 @ 5mA, 8V

Current - Collector (Ic) (Max):: 20mA

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23

BFR 181 E6780 FAQ

1.How can I place an order for BFR 181 E6780 through Aetrix?

Please submit a Request for Quotation (RFQ) for BFR 181 E6780 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 BFR 181 E6780 reliable?

The price and inventory of BFR 181 E6780 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BFR 181 E6780 is usually 5 days.

3.What payment methods are accepted for BFR 181 E6780?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BFR 181 E6780 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BFR 181 E6780?

BFR 181 E6780 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BFR 181 E6780 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 BFR 181 E6780?

For technical support, including BFR 181 E6780 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BFR 181 E6780 requirements.

6.How does Aetrix verify that BFR 181 E6780 is sourced from the original manufacturer or authorized distributors?

All BFR 181 E6780 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 BFR 181 E6780 meets industry standards.

7.What is the process for return or replacement of BFR 181 E6780?

All BFR 181 E6780 units undergo pre-shipment inspection (PSI). If there is an issue with BFR 181 E6780, 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 BFR 181 E6780 part is unused and in its original packaging.

Return procedure for BFR 181 E6780:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…