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Analog Devices Inc. LTC6433BIUF-15#PBF
- Part No.:
- LTC6433BIUF-15#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC6433BIUF-15#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LTC6433BIUF-15#PBF from Analog Devices (formerly Linear Technology) is a high-linearity, single-ended 50Ω IF gain block amplifier optimized for 100kHz–1GHz signal chain applications. It delivers 15.9dB power gain, 47dBm OIP3 at 150MHz, 3.22dB noise figure, >2VP-P linear output swing, and operates from a single 5V supply drawing 95mA. It is used in ADC driver, CATV, and test equipment front-ends where wideband flat gain and low distortion are critical.
For engineers reviewing the LTC6433BIUF-15#PBF datasheet, LTC6433BIUF-15#PBF pinout, LTC6433BIUF-15#PBF application, or LTC6433BIUF-15#PBF equivalent, key selection criteria include its B-grade OIP3 performance at 150MHz, internally matched 50Ω I/O, user-defined low-frequency cutoff via external components, and thermal stability enabled by on-chip bias/temperature compensation.
Technical Context
The LTC6433BIUF-15#PBF implements a SiGe BiCMOS-based Darlington-pair input stage with shunt-series feedback to simultaneously match 50Ω source/load while minimizing Miller effect and maximizing linearity. Its open-collector output topology enables high RF power delivery without resistive collector biasing losses.
On-chip bias control dynamically optimizes the internal operating point across temperature and supply variation, maintaining stable gain and OIP3. A dedicated NFILT pin accepts an external capacitor to suppress low-frequency noise, and FDBK requires a capacitor to OUT to ensure gain flatness below 100MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Power Gain | 15.9dB at 150MHz - provides fixed, predictable amplification without external matching networks |
| OIP3 (B-grade) | 47dBm at 150MHz - enables high dynamic range in multi-tone RF environments |
| Noise Figure | 3.22dB at 150MHz - supports sensitive receiver front-ends with minimal signal degradation |
| Bandwidth | DC–2GHz –3dB BW - usable from 100kHz to 1GHz with flat gain via demo circuit |
| Supply | Single 5V @ 95mA - simplifies power architecture; 475mW total DC power |
| Input/Output Match | Internally matched to 50Ω - eliminates need for external matching components |
| Stability | Unconditionally stable - no external stabilization required across full frequency range |
Pinout & Package
The LTC6433BIUF-15#PBF is housed in a 4mm × 4mm 24-lead plastic QFN package with exposed pad (Pin 25), which must be soldered to PCB ground for thermal management and low-inductance grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (24) | Signal Input | Internally biased at 2V DC; requires DC blocking capacitor; 50Ω matched |
| OUT (18) | Amplifier Output | Open-collector output; requires RF choke and DC blocking capacitor |
| VCC (9, 22) | Positive Supply | Two pins internally connected; each requires local 1000pF + 0.1µF bypass |
| GND (8, 17, 23, 25) | Ground | Multiple ground connections including exposed pad; all must connect to low-inductance ground plane |
| NFILT (6) | Noise Filter | Connects external capacitor to GND to reduce low-frequency noise |
| FDBK (19) | Feedback | Requires capacitor to OUT to extend low-frequency gain flatness and improve matching |
| T_DIODE (15) | Temperature Diode | Forward-biased at 1mA; voltage drop indicates die temperature (0.85V typ, 1.4mV/°C) |
| DNC (1–5, 7, 10–14, 16, 20, 21) | Do Not Connect | Must remain floating; connection may impair performance or stability |
Key Features
| Feature | Design Value |
|---|---|
| SiGe BiCMOS Process | Delivers superior repeatability and linearity vs. GaAs alternatives, with guaranteed B-grade OIP3 testing |
| User-Defined Low-Frequency Cutoff | Enables system-level bandwidth tailoring via external NFILT and FDBK capacitors |
| Thermal & Supply Compensation | Maintains consistent gain, OIP3, and NF over –40°C to 85°C case temperature and ±5% VCC variation |
| 50Ω Single-Ended Interface | Eliminates external matching networks, reducing bill-of-materials and layout complexity |
| Exposed Pad Thermal Path | θJC = 44°C/W enables reliable operation at full 95mA load without external heatsinking |
Applications
| ADC Driver | CATV Upstream Amplifier |
|---|---|
Use Scenario: Driving high-speed analog-to-digital converters in software-defined radio receivers requiring wide dynamic range and low harmonic distortion. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier placed between filter bank and ADC input to boost signal level while preserving SNR and SFDR. Use Value: 47dBm OIP3 and 3.22dB NF at 150MHz enable >80dB spurious-free dynamic range for 14-bit ADCs sampling at 125MSPS. | Use Scenario: Amplifying upstream return-path signals (5–42MHz) in hybrid fiber-coaxial cable infrastructure with stringent DOCSIS linearity requirements. IC Role / Device Role / Timing Role: Single-ended 50Ω gain block in upstream transmit path, interfacing directly with coaxial cable interface and upstream filter. Use Value: Internally matched 50Ω I/O and 15.9dB gain simplify board layout; unconditionally stable operation prevents oscillation in noisy cable plant environments. |
| RF Test Equipment Front-End | Wideband Spectrum Analyzer Intermediate Stage |
Use Scenario: Signal conditioning in benchtop RF signal analyzers and vector network analyzers requiring flat gain and low noise across multiple octaves. IC Role / Device Role / Timing Role: First-stage IF amplifier after mixer, providing gain and isolation before further downconversion or digitization. Use Value: 13-octave flat gain (100kHz–1GHz) and <–10dB S11 up to 1.2GHz ensure measurement accuracy and minimize calibration drift. | Use Scenario: Intermediate frequency amplification in portable spectrum analyzers where size, power, and thermal constraints limit discrete solutions. IC Role / Device Role / Timing Role: Wideband gain block in IF strip between first and second downconversion stages, supporting real-time analysis bandwidths up to 100MHz. Use Value: 4mm × 4mm QFN package with exposed pad enables compact, thermally robust designs; 95mA quiescent current supports battery-powered operation with efficient thermal dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IF amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6401IRGTR | Higher gain (20dB), wider bandwidth (DC–4.5GHz), but higher power (125mA), no internal 50Ω match - requires external matching | Better suited for DC-coupled, ultra-wideband applications; less ideal for narrowband 50Ω systems due to matching overhead | Select LMH6401IRGTR only when DC coupling or >1GHz bandwidth is mandatory; LTC6433BIUF-15#PBF offers lower BOM count for standard 50Ω IF chains |
| QPL9057TR13 | Lower gain (15.5dB), narrower bandwidth (10MHz–6GHz), GaAs process, no internal bias - requires external bias network and matching | Optimized for higher-frequency cellular infrastructure; lacks low-frequency capability and integrated compensation | Choose QPL9057TR13 for 5G FR1 front-ends above 1GHz; LTC6433BIUF-15#PBF remains preferred for sub-1GHz IF stages with thermal stability needs |
Compared with LMH6401IRGTR and QPL9057TR13, the LTC6433BIUF-15#PBF uniquely combines internal 50Ω matching, guaranteed B-grade OIP3 at 150MHz, and on-chip thermal compensation - reducing design risk and component count in cost-sensitive, thermally variable IF applications.
Availability
LTC6433BIUF-15#PBF is available at Aetrix Electronics and suitable for ADC driver, CATV upstream amplifier, and RF test equipment applications requiring stable component supply, guaranteed B-grade linearity, and production-ready thermal performance.
Supply support for LTC6433BIUF-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, communications, and industrial markets.
The LTC6433-15 product line was designed specifically for wideband, high-linearity IF amplification in communication and test equipment, emphasizing ease of use through internal 50Ω matching, self-biasing, and thermal compensation.
FAQ
What is the guaranteed OIP3 performance of the LTC6433BIUF-15#PBF at 150MHz?
The LTC6433BIUF-15#PBF is a B-grade device with guaranteed minimum OIP3 of 46.0dBm at 150MHz under POUT = 2dBm/tone and Δf = 1MHz conditions. Typical performance is 47.2dBm, and this specification is verified during production test per Linear Technology's A/B grade binning protocol.
Does the LTC6433BIUF-15#PBF require external input/output matching networks?
No. The LTC6433BIUF-15#PBF features internal 50Ω input and output impedance matching, eliminating the need for external matching components. This simplifies layout and reduces part count, though DC blocking capacitors and an RF choke at the output remain mandatory for proper biasing and RF isolation.
How does the NFILT pin function in the LTC6433BIUF-15#PBF?
The NFILT pin (Pin 6) connects to an external capacitor to ground to suppress low-frequency noise, particularly below 10MHz. A typical value is 1µF, and this capacitor forms a low-pass filter with internal circuitry to reduce 1/f noise contribution without affecting RF gain flatness above 100kHz.
Can the LTC6433BIUF-15#PBF operate with a supply voltage other than 5V?
Yes. The LTC6433BIUF-15#PBF operates over a supply range of 4.75V to 5.25V. Performance metrics such as gain, OIP3, and NF vary minimally across this range - for example, OIP3 changes by less than ±0.5dB from 4.75V to 5.25V at 150MHz - enabling stable operation with standard 5V LDOs or switching regulators.
What is the role of the FDBK pin in the LTC6433BIUF-15#PBF?
The FDBK pin (Pin 19) requires an external capacitor connected to the OUT pin (Pin 18) to establish low-frequency feedback, ensuring gain flatness and improved input/output matching below ~100MHz. Without this capacitor, low-frequency gain rises and return loss degrades, potentially causing instability or passband ripple.
LTC6433BIUF-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:
- 95mA
- 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)
LTC6433BIUF-15#PBF FAQ
1.How can I place an order for LTC6433BIUF-15#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6433BIUF-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 LTC6433BIUF-15#PBF reliable?
The price and inventory of LTC6433BIUF-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 LTC6433BIUF-15#PBF is usually 5 days.
3.What payment methods are accepted for LTC6433BIUF-15#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6433BIUF-15#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6433BIUF-15#PBF?
LTC6433BIUF-15#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6433BIUF-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 LTC6433BIUF-15#PBF?
For technical support, including LTC6433BIUF-15#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6433BIUF-15#PBF requirements.
6.How does Aetrix verify that LTC6433BIUF-15#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6433BIUF-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 LTC6433BIUF-15#PBF meets industry standards.
7.What is the process for return or replacement of LTC6433BIUF-15#PBF?
All LTC6433BIUF-15#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6433BIUF-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 LTC6433BIUF-15#PBF part is unused and in its original packaging.
Return procedure for LTC6433BIUF-15#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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