My Inquiry
My Account
Analog Devices Inc. LTC6431BIUF-15#PBF
- Part No.:
- LTC6431BIUF-15#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC6431BIUF-15#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,118
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC6431BIUF-15#PBF from Analog Devices (formerly Linear Technology) is a 15.5dB fixed-gain, single-ended IF amplifier optimized for 20MHz–1700MHz operation with 47dBm OIP3 at 240MHz, 3.33dB noise figure, and 20.6dBm P1dB - deployed in RF signal chains for ADC driving and CATV infrastructure.
For engineers reviewing the LTC6431BIUF-15#PBF datasheet, LTC6431BIUF-15#PBF pinout, LTC6431BIUF-15#PBF application, or LTC6431BIUF-15#PBF equivalent, key selection criteria include guaranteed B-grade OIP3 performance, internal 50Ω matching, thermal diode monitoring capability, and QFN-24 package compatibility with wideband RF layout best practices.
Technical Context
The LTC6431BIUF-15#PBF implements a SiGe BiCMOS-based Darlington input stage with shunt-series feedback to simultaneously achieve 50Ω input/output matching and high linearity. Its on-chip bias and temperature compensation maintain stable OIP3 and gain across –40°C to 85°C case temperature.
It operates unconditionally stable from 20MHz to 2GHz with K > 1.07 up to 1.2GHz and uses an open-collector output topology powered via external RF choke, enabling high linear output swing (>2VP-P) without collector resistor loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 15.5dB fixed, de-embedded to package - enables predictable cascade gain planning without external matching networks. |
| OIP3 (240MHz) | 47dBm (B-grade), measured at 2dBm/tone, Δf = 1MHz - supports high-dynamic-range receiver front-ends. |
| Noise Figure | 3.33dB at 240MHz - minimizes degradation of system SNR in sensitive IF amplification stages. |
| P1dB | 20.6dBm - delivers robust large-signal handling for ADC driver applications with >2VP-P linear swing. |
| Bandwidth | 20MHz–1700MHz (S11/S22 < –10dB) - covers LTE, WiMAX, and cable DOCSIS upstream/downstream bands. |
| Supply | Single 5V supply, 90mA total current - simplifies power architecture versus dual-rail RF amplifiers. |
| Package | 24-lead 4mm × 4mm QFN with exposed GND pad - provides low-inductance grounding and thermal path for RF stability. |
Pinout & Package
Package: 24-lead plastic QFN (4mm × 4mm), exposed pad (Pin 25) connected to GND and required to be soldered to PCB ground plane for thermal and RF performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (24) | RF Input | Internally biased at 2V DC; requires external DC blocking capacitor; matched to 50Ω from 20MHz–1700MHz. |
| OUT (18) | RF Output | Open-collector output requiring external RF choke for DC bias feed and RF isolation; 50Ω matched. |
| VCC (9, 22) | Positive Supply | Two dedicated 5V supply pins; each requires local 1000pF + 0.1µF bypassing for broadband decoupling. |
| GND (8, 17, 23, 25) | Ground | Four ground connections including exposed pad; all must connect to low-inductance PCB ground plane. |
| T_DIODE (16) | Temperature Monitor | Forward-biased diode providing voltage proportional to die temperature; enables thermal management in dense layouts. |
| DNC (1–7, 10–15, 19–21) | No Connect | Must remain floating; connection risks performance degradation or instability. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 50Ω Matching | Eliminates discrete matching networks across 20MHz–1700MHz, reducing BOM count and layout sensitivity. |
| B-Grade OIP3 Guarantee | 47dBm at 240MHz (A-grade: 47dBm; B-grade: 45dBm) - enables cost-optimized selection without sacrificing linearity assurance. |
| Thermal Diode Monitoring | T_DIODE pin provides real-time junction temperature feedback for closed-loop thermal derating in high-density RF modules. |
| Unconditional Stability | K > 1.07 up to 1.2GHz ensures stable operation without external stabilization networks in wideband designs. |
| SiGe BiCMOS Process | Delivers superior repeatability vs GaAs alternatives, with consistent gain flatness and distortion performance across production lots. |
Applications
| Direct-Conversion Receiver IF Stage | High-Speed ADC Driver |
|---|---|
Use Scenario: Amplifying baseband or low-IF signals in zero-IF receivers for cellular infrastructure and spectrum analyzers. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier placed between mixer and ADC, providing gain, noise optimization, and OIP3 headroom. Use Value: 3.33dB NF and 47dBm OIP3 preserve dynamic range while 15.5dB gain compensates for mixer loss before digitization. | Use Scenario: Driving the analog input of 12–16-bit, 100+ MSPS ADCs in radar and communications test equipment. IC Role / Device Role / Timing Role: Single-ended buffer amplifier delivering >2VP-P linear swing into 50Ω or high-Z ADC inputs. Use Value: 20.6dBm P1dB and >2VP-P swing ensure full-scale ADC utilization without clipping or harmonic distortion. |
| CATV Upstream Amplifier | DOCSIS 3.1/4.0 Node Amplifier |
Use Scenario: Boosting upstream return-path signals (5–85MHz) in HFC node amplifiers with stringent distortion requirements. IC Role / Device Role / Timing Role: Low-noise, high-linearity gain block in upstream signal chain before diplexer and fiber interface. Use Value: –88dBc IM3 at 2dBm/tone and 45dBm B-grade OIP3 meet SCTE-40 return-path CNR and composite second-order specs. | Use Scenario: Wideband IF amplification in DOCSIS 3.1/4.0 active node designs supporting 1.2GHz downstream bandwidth. IC Role / Device Role / Timing Role: Fixed-gain amplifier in downstream signal path after QAM modulator and before power amplifier. Use Value: 1700MHz bandwidth and S22 < –15dB up to 1.2GHz enable flat response across full DOCSIS channel plan without tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IF amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT5554IMS#TRPBF | 16dB gain, 4.2dB NF at 190MHz, 45dBm OIP3, 3.3V supply, 16-pin MSOP | Narrower bandwidth (10MHz–3GHz), lower supply voltage, no thermal diode | Select for low-voltage, space-constrained IF stages where 5V operation is unavailable. |
| QPL9547TR13 | 15.5dB gain, 3.5dB NF at 2.1GHz, 42dBm OIP3, 5V supply, 6-pin DFN | Higher-frequency optimized (1.5–2.7GHz), smaller package, no internal matching below 1.5GHz | Select for 2.1GHz LTE/5G FR1 front-end IF amplification where sub-1GHz matching is not required. |
Compared with LT5554IMS#TRPBF and QPL9547TR13, the LTC6431BIUF-15#PBF offers broader low-frequency coverage (20MHz start), guaranteed B-grade OIP3 at 240MHz, and integrated thermal monitoring - making it optimal for wideband CATV, multi-standard IF, and ADC driver applications demanding stability and linearity down to VHF.
Availability
LTC6431BIUF-15#PBF is available at Aetrix Electronics and suitable for CATV infrastructure, wireless test equipment, and high-speed data acquisition systems requiring stable component supply, guaranteed RF performance, and long-term industrial availability.
Supply support for LTC6431BIUF-15#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 legacy of high-performance analog and RF ICs for precision signal conditioning and wireless infrastructure.
The LTC6431 family was designed specifically for wideband, high-linearity IF amplification in communications test, CATV, and instrumentation - emphasizing ease-of-use through internal matching and bias stability.
FAQ
What is the guaranteed OIP3 performance of the LTC6431BIUF-15#PBF at 240MHz?
The LTC6431BIUF-15#PBF is B-grade and guaranteed to deliver 45dBm OIP3 at 240MHz (POUT = 2dBm/tone, Δf = 1MHz). This is tested and specified per Linear Technology's datasheet AC Electrical Characteristics table, distinguishing it from the A-grade variant which guarantees 47dBm at the same condition.
Does the LTC6431BIUF-15#PBF require external input/output matching components?
No - the LTC6431BIUF-15#PBF features internal 50Ω matching from 20MHz to 1700MHz at both input and output. External DC blocking capacitors are mandatory, but no impedance-matching networks are needed, significantly simplifying layout and reducing bill-of-materials count.
How is thermal monitoring implemented on the LTC6431BIUF-15#PBF?
The LTC6431BIUF-15#PBF includes a dedicated T_DIODE pin (Pin 16) that functions as a forward-biased diode. When biased with 1mA to ground, its voltage drop correlates directly with junction temperature - enabling real-time thermal monitoring without external sensors.
What supply voltage and current does the LTC6431BIUF-15#PBF require?
The LTC6431BIUF-15#PBF operates from a single 4.75V–5.25V supply and draws 90mA total current (typical) at 5V. Current splits across two VCC pins (9 and 22), each requiring local 1000pF + 0.1µF bypassing to ensure stable RF performance.
Is the LTC6431BIUF-15#PBF unconditionally stable across its operating bandwidth?
Yes - the LTC6431BIUF-15#PBF achieves unconditional stability (K > 1) up to 1.2GHz, verified by S-parameter measurements. Its internal feedback architecture and open-collector output eliminate the need for external stabilization networks in most wideband applications.
LTC6431BIUF-15#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:
- 85.1mA
- 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)
LTC6431BIUF-15#PBF FAQ
1.How can I place an order for LTC6431BIUF-15#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6431BIUF-15#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 LTC6431BIUF-15#PBF reliable?
The price and inventory of LTC6431BIUF-15#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6431BIUF-15#PBF is usually 5 days.
3.What payment methods are accepted for LTC6431BIUF-15#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6431BIUF-15#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6431BIUF-15#PBF?
LTC6431BIUF-15#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6431BIUF-15#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 LTC6431BIUF-15#PBF?
For technical support, including LTC6431BIUF-15#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6431BIUF-15#PBF requirements.
6.How does Aetrix verify that LTC6431BIUF-15#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6431BIUF-15#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 LTC6431BIUF-15#PBF meets industry standards.
7.What is the process for return or replacement of LTC6431BIUF-15#PBF?
All LTC6431BIUF-15#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6431BIUF-15#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 LTC6431BIUF-15#PBF part is unused and in its original packaging.
Return procedure for LTC6431BIUF-15#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC6431BIUF-15#PBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
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…
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…
