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Analog Devices Inc. LTC6431AIUF-20#PBF
- Part No.:
- LTC6431AIUF-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC6431AIUF-20#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:280
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Product details
Overview
LTC6431AIUF-20#PBF from Analog Devices (formerly Linear Technology) is a 20.8dB fixed-gain, single-ended RF gain block amplifier optimized for IF signal chain applications from 20MHz to 1400MHz. It delivers 46.2dBm OIP3 at 240MHz, 2.6dB noise figure, and 22.0dBm P1dB into 50Ω with only 93mA quiescent current from a single 5V supply - ideal for high-linearity ADC driver and CATV infrastructure stages.
For engineers reviewing the LTC6431AIUF-20#PBF datasheet, LTC6431AIUF-20#PBF pinout, LTC6431AIUF-20#PBF application, or LTC6431AIUF-20#PBF equivalent, this page provides verified specifications, validated pin functions, real-world use cases in 50Ω-matched RF systems, and confirmed alternative options for IF amplification where wideband linearity and low-noise performance are critical.
Technical Context
The LTC6431AIUF-20#PBF employs a SiGe BiCMOS process with internal shunt-series feedback to simultaneously match input/output to 50Ω across 20MHz–1400MHz while minimizing Miller effect and maximizing stability. Its Darlington-pair input stage ensures high input impedance and current gain without external bias networks.
On-chip bias and temperature compensation maintain consistent OIP3 and gain over –40°C to 85°C case temperature. The open-collector output topology enables high linear output swing (>2.0VP-P) and efficient power delivery via RF choke, decoupling amplifier operation from DC biasing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20.8dB typical at 240MHz - fixed, internally matched, eliminates external matching networks |
| OIP3 | 46.2dBm at 240MHz (A-grade, 2dBm/tone) - enables high dynamic range in multi-tone IF systems |
| Noise Figure | 2.6dB at 240MHz - preserves SNR in sensitive receiver front-ends and ADC driver paths |
| P1dB | 22.0dBm - supports >2.0VP-P linear output swing into 50Ω loads |
| Bandwidth | 2000MHz –3dB BW (20MHz low-frequency cutoff) - covers LTE, WiMAX, and cable DOCSIS IF bands |
| Supply Current | 93mA total at 5V - low power for high-performance RF gain blocks |
| Input/Output Impedance | Internally matched to 50Ω - simplifies PCB layout and eliminates discrete matching components |
Pinout & Package
The LTC6431AIUF-20#PBF is housed in a 24-lead 4mm × 4mm plastic QFN package with exposed pad (Pin 25), requiring soldering to PCB ground plane for thermal management and low-inductance RF grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 24) | RF Input | Single-ended 50Ω-matched input with 2.0V internal DC bias - requires external DC blocking capacitor |
| OUT (Pin 18) | RF Output | Open-collector output requiring RF choke for DC feed and DC blocking capacitor - enables high-power linear drive |
| VCC (Pins 9, 22) | Positive Supply | 5V supply pins - each must be bypassed with 1000pF + 0.1µF capacitors; dual pins reduce supply inductance |
| GND (Pins 8, 17, 23, 25) | Ground | Multiple ground terminals including exposed pad - all must connect to low-inductance PCB ground plane |
| T_DIODE (Pin 16) | Temperature Monitor | Forward-biased diode output - voltage drop indicates die temperature for thermal management |
| DNC (Pins 1–7, 10–15, 19–21) | No Connect | Must float - connection impairs RF performance and linearity |
Key Features
| Feature | Design Value |
|---|---|
| Internal 50Ω Matching | Eliminates external matching networks from 20MHz to 1400MHz - reduces BOM count and layout sensitivity |
| A-Grade OIP3 Guarantee | 100% tested at 240MHz - ensures minimum linearity performance for production-critical RF stages |
| Temperature-Compensated Bias | Maintains optimal operating point across –40°C to 85°C - avoids gain/OIP3 drift in uncontrolled environments |
| Low-Noise SiGe BiCMOS Core | 0.6nV/√Hz input noise density - preserves signal integrity in cascaded receiver chains |
| Exposed Pad Thermal Path | θJC = 54°C/W - enables reliable operation at full 93mA load without external heatsinking |
Applications
| ADC Driver | CATV Infrastructure |
|---|---|
|
Use Scenario: Driving the analog input of high-speed pipeline or interleaved ADCs in broadband receivers. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier providing clean, linear signal conditioning before digitization. Use Value: 46.2dBm OIP3 and 2.6dB NF preserve SFDR and ENOB across multi-MHz bandwidths without gain compression. |
Use Scenario: Amplifying downstream IF signals in HFC node and optical receiver modules. IC Role / Device Role / Timing Role: 50Ω-matched gain block in 75Ω system via simple impedance transformation network. Use Value: 20.8dB flat gain and <–10dB S11/S22 up to 1.4GHz ensure stable cascade performance in multi-stage CATV amplifiers. |
| Wireless Baseband | Test & Measurement Front-End |
|
Use Scenario: Intermediate frequency amplification in LTE/FDD-TDD small cell transceivers. IC Role / Device Role / Timing Role: Single-ended IF gain stage between mixer and filter bank in compact radio designs. Use Value: 2000MHz bandwidth and low 93mA supply current enable high-density RF module integration with minimal thermal impact. |
Use Scenario: Signal conditioning in spectrum analyzer and vector signal analyzer IF paths. IC Role / Device Role / Timing Role: High-linearity, low-distortion gain element in calibrated measurement signal chains. Use Value: Guaranteed A-grade OIP3 and <–23dB S12 reverse isolation prevent measurement error from signal leakage and reflections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-gain RF amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC625BLC4TR | 22dB gain, GaAs pHEMT process, 5V/110mA, 0.01–20GHz BW - higher gain but wider bandwidth and higher power | Used in microwave test equipment and radar IF; less optimized for sub-1.5GHz CATV/ADC driver use | Select when >2GHz bandwidth or higher gain is required; verify thermal design due to higher current draw |
| QPL9057TR13 | 20dB gain, GaAs pHEMT, 5V/65mA, 0.6–6GHz BW - lower current, narrower bandwidth, no integrated temp diode | Targeted at 5G FR1 front-end modules; lacks A-grade OIP3 guarantee and 50Ω matching below 600MHz | Prefer for battery-powered or thermally constrained 5G IF stages; not recommended for 240MHz–1400MHz precision linearity needs |
Compared with HMC625BLC4TR and QPL9057TR13, the LTC6431AIUF-20#PBF offers superior OIP3 consistency at 240MHz, guaranteed A-grade testing, and tighter 50Ω matching across the 20–1400MHz IF band - making it the preferred choice for production ADC drivers and CATV infrastructure where linearity repeatability is non-negotiable.
Availability
LTC6431AIUF-20#PBF is available at Aetrix Electronics and suitable for ADC driver, CATV infrastructure, and wireless baseband applications requiring stable component supply, guaranteed linearity performance, and long-term industrial temperature support.
Supply support for LTC6431AIUF-20#PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog and RF product lines with rigorous characterization and reliability standards.
The LTC6431AIUF-20#PBF belongs to the LTC6431 family of wideband gain blocks designed specifically for demanding IF signal chain applications where simultaneous linearity, noise, power, and ease-of-use must be balanced without compromise.
FAQ
What is the operating temperature range for the LTC6431AIUF-20#PBF?
The LTC6431AIUF-20#PBF is rated for an operating case temperature range of –40°C to +85°C. This is validated across all AC and DC specifications in the datasheet, including OIP3, gain flatness, and noise figure. The device uses on-chip temperature compensation to maintain performance within this full industrial range without external calibration.
Does the LTC6431AIUF-20#PBF require external matching components?
No, the LTC6431AIUF-20#PBF does not require external matching components. Its input and output are internally matched to 50Ω from 20MHz to 1400MHz, as confirmed by S11 < –10dB and S22 < –10dB measurements across that band. Only DC blocking capacitors and RF choke/bypass networks are needed for functional implementation.
How is the A-grade specification verified for the LTC6431AIUF-20#PBF?
The A-grade specification for the LTC6431AIUF-20#PBF is verified by 100% production testing of OIP3 at 240MHz under defined conditions (POUT = 2dBm/tone, ∆f = 1MHz). This guarantee applies only to parts marked "LTC6431AIUF-20#PBF" - the "I" denotes Industrial grade with full A-grade OIP3 screening.
Can the LTC6431AIUF-20#PBF be used with a 3.3V supply?
No, the LTC6431AIUF-20#PBF is specified only for 5V operation (4.75V to 5.25V). The absolute maximum supply voltage is 5.5V, and performance parameters - including gain, OIP3, and NF - are characterized exclusively at 5V. Operation at 3.3V is outside specification and will result in degraded or nonfunctional performance.
What is the purpose of the T_DIODE pin on the LTC6431AIUF-20#PBF?
The T_DIODE pin (Pin 16) on the LTC6431AIUF-20#PBF provides access to an on-die temperature-sensing diode. When forward-biased with 1mA, its voltage drop correlates linearly with junction temperature - enabling real-time thermal monitoring without external sensors. This feature supports thermal derating and system-level fault detection in the LTC6431AIUF-20#PBF design.
LTC6431AIUF-20#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 GHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 93mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC6431AIUF-20#PBF FAQ
1.How can I place an order for LTC6431AIUF-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6431AIUF-20#PBF 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 LTC6431AIUF-20#PBF reliable?
The price and inventory of LTC6431AIUF-20#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6431AIUF-20#PBF is usually 5 days.
3.What payment methods are accepted for LTC6431AIUF-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6431AIUF-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6431AIUF-20#PBF?
LTC6431AIUF-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6431AIUF-20#PBF 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 LTC6431AIUF-20#PBF?
For technical support, including LTC6431AIUF-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6431AIUF-20#PBF requirements.
6.How does Aetrix verify that LTC6431AIUF-20#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6431AIUF-20#PBF 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 LTC6431AIUF-20#PBF meets industry standards.
7.What is the process for return or replacement of LTC6431AIUF-20#PBF?
All LTC6431AIUF-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6431AIUF-20#PBF, 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 LTC6431AIUF-20#PBF part is unused and in its original packaging.
Return procedure for LTC6431AIUF-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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