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Analog Devices Inc. LT6221CDD#TRPBF
- Part No.:
- LT6221CDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT6221CDD#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,299
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Product details
Overview
LT6221CDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail input and output precision operational amplifier in an 8-lead 3mm × 3mm DFN package. It delivers 60MHz gain-bandwidth product, 20V/µs slew rate, <350µV input offset voltage (max), 1mA supply current per amplifier, and operates from 2.2V to 12.6V supplies - enabling high-fidelity signal conditioning in low-voltage, space-constrained data acquisition systems.
For engineers reviewing the LT6221CDD#TRPBF datasheet, LT6221CDD#TRPBF pinout, LT6221CDD#TRPBF application, or LT6221CDD#TRPBF equivalent, this page provides verified specifications, package layout, real-world use cases in ADC driving and active filtering, and validated alternative options for design continuity and sourcing flexibility.
Technical Context
The LT6221CDD#TRPBF employs a dual-input-stage architecture with PNP and NPN differential pairs that auto-switch across the full input common-mode range (0V to VS), ensuring rail-to-rail operation without phase reversal. Its output stage delivers ±50mA typical drive capability while swinging within 10mV of either rail under load.
It features matched channel performance (e.g., ≤150µV input offset match), 102dB CMRR, 105dB PSRR, and low 10nV/√Hz input voltage noise - making it suitable for precision DC-coupled amplification and high-frequency AC signal paths where accuracy and bandwidth coexist.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 60MHz - supports stable unity-gain and moderate closed-loop gains up to ~10× at multi-MHz frequencies. |
| Slew Rate | 20V/µs - enables clean 4VP-P output at ≥1MHz without slewing distortion. |
| Input Offset Voltage | ≤350µV (max) - ensures sub-0.1% error in 12-bit+ precision gain stages and sensor interfaces. |
| Supply Current per Amplifier | 1mA (max) - allows dual-channel operation below 2.1mA total, ideal for battery-powered instrumentation. |
| Input Common-Mode Range | 0V to VS - accepts signals at ground or near-rail levels without clipping or bias shift. |
| Output Swing (RL = 1kΩ) | Within 10mV of rails - maximizes dynamic range in 3.3V or 5V single-supply systems. |
| Operating Temperature Range | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
Pinout & Package
LT6221CDD#TRPBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed pad internally connected to VS–. The package supports high thermal efficiency (θJA = 160°C/W) and compact PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Delivers rail-to-rail buffered signal; capable of sourcing/sinking ≥20mA. |
| 2 (–IN A) | Inverting input of Amp A | Differential node for feedback networks; high-impedance (IB ≤150nA max). |
| 3 (+IN A) | Non-inverting input of Amp A | Accepts signals from 0V to VS; matched to –IN A for precision differential gain. |
| 4 (VS–) | Negative supply rail | Reference for both amplifiers; connects internally to exposed thermal pad. |
| 5 (VS+) | Positive supply rail | Supports single-supply (2.2V–12.6V) or split-supply (±2.5V–±5V) operation. |
| 6 (OUT B) | Amplifier B output | Independent output; identical AC/DC specs to OUT A for dual-channel signal chains. |
| 7 (–IN B) | Inverting input of Amp B | Matched to –IN A (≤150µV offset match); enables tightly coupled dual-opamp topologies. |
| 8 (+IN B) | Non-inverting input of Amp B | Full rail-to-rail common-mode support; usable as reference buffer or second sensor channel. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interfacing with ADCs, DACs, and sensors operating at supply rails - no level-shifting required. |
| Low input bias current (≤150nA) | Minimizes voltage error in high-impedance source applications (e.g., photodiode transimpedance amps). |
| High PSRR (105dB) and CMRR (102dB) | Rejects supply ripple and common-mode noise in noisy industrial environments without external filtering. |
| 60MHz GBW with 1mA quiescent current | Delivers >10× bandwidth efficiency vs. legacy precision op amps - critical for wideband sensor signal chains. |
| Specified for 0°C to 70°C range | Guarantees full parameter compliance across commercial temperature range - simplifies qualification testing. |
Applications
| ADC Driver | Active Filter |
|---|---|
|
Use Scenario: Driving the input of a 12-bit SAR ADC (e.g., LTC23xx series) in a portable data logger with 3.3V single supply. IC Role / Device Role: Precision buffer and level shifter, maintaining signal integrity during fast acquisition windows. Use Value: Rail-to-rail output swing and low 10nV/√Hz noise ensure full-scale utilization and <0.5LSB noise floor contribution. |
Use Scenario: Implementing a 2nd-order Sallen-Key low-pass filter at 1MHz cutoff in medical ECG front-end circuitry. IC Role / Device Role: Dual-amplifier topology performing both gain and filtering functions in one package. Use Value: 60MHz GBW and 20V/µs slew rate prevent phase lag and distortion at filter edge frequencies. |
| Rail-to-Rail Sensor Interface | Video Signal Conditioning |
|
Use Scenario: Amplifying output of a 0–5V automotive pressure sensor in an engine control unit with 5V supply. IC Role / Device Role: High-accuracy, low-drift gain stage compensating for sensor offset and scaling. Use Value: ≤350µV max VOS and 1.5µV/°C drift ensure <0.01% FS error over operating temperature. |
Use Scenario: Buffering composite video (CVBS) signal before HDMI encoder in consumer set-top box. IC Role / Device Role: Wideband line driver with low differential gain/phase error for NTSC/PAL standards. Use Value: ∆G = 0.3%, ∆φ = 0.3° at 500kHz meets broadcast-grade video fidelity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Chopper-stabilized (0.02µV/°C drift), lower noise (8nV/√Hz), but lower GBW (350kHz) and slew rate (0.16V/µs). | Better for ultra-low-drift DC applications (e.g., weigh scales); unsuitable for >100kHz signal paths. | Select when long-term DC stability outweighs bandwidth; avoid for video or fast ADC driving. |
| AD8642ARZ | Higher GBW (24MHz), lower input bias (1pA), but higher supply current (1.2mA per amp) and narrower supply range (2.7–6V). | Preferred for ultra-high-impedance sources (e.g., pH electrodes); limited to 3.3V/5V systems. | Choose for femtoampere-level sensor interfaces where supply headroom is constrained to ≤6V. |
Compared with LT6221CDD#TRPBF, OPA2333AIDR trades bandwidth for nanovolt-level drift stability, while AD8642ARZ offers superior input impedance at the cost of supply flexibility and slew performance - making LT6221CDD#TRPBF optimal for balanced wideband precision in 2.2–12.6V systems.
Availability
LT6221CDD#TRPBF is available at Aetrix Electronics and suitable for data acquisition, industrial sensor conditioning, and medical signal processing requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for LT6221CDD#TRPBF 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) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs, serving industrial, automotive, communications, and healthcare markets.
The LT6221 belongs to Linear's precision high-speed op amp family, designed specifically for applications demanding simultaneous rail-to-rail operation, low power, and MHz-range bandwidth - bridging the gap between general-purpose and RF amplifiers.
FAQ
What is the maximum supply voltage rating for LT6221CDD#TRPBF?
The absolute maximum total supply voltage (VS+ to VS–) for LT6221CDD#TRPBF is 12.6V. Operation beyond this risks permanent damage. The device is fully specified from 2.2V to 12.6V, with guaranteed performance at 3V, 5V, and ±5V supplies - making LT6221CDD#TRPBF suitable for both low-voltage portable designs and higher-voltage industrial systems.
Does LT6221CDD#TRPBF support rail-to-rail input with inputs driven beyond the supply rails?
Yes, LT6221CDD#TRPBF inputs can be driven beyond the supply rails without damage or phase reversal, thanks to internal back-to-back diode protection. The input common-mode range is specified from 0V to VS, and the device tolerates differential input voltages up to ±1.4V. Exceeding ±1.4V requires limiting input current to <10mA - a key robustness feature confirmed in the LT6221CDD#TRPBF datasheet Absolute Maximum Ratings table.
What is the thermal performance of the LT6221CDD#TRPBF DFN package?
The LT6221CDD#TRPBF uses an 8-lead 3mm × 3mm DFN package with θJA = 160°C/W (measured on short traces). Its exposed pad is internally connected to VS–, allowing direct thermal coupling to a PCB ground or VS– plane. Adding copper area under the pad significantly reduces junction-to-board thermal resistance - a documented layout practice that improves power handling and long-term reliability for LT6221CDD#TRPBF in continuous-output applications.
How does LT6221CDD#TRPBF achieve rail-to-rail output swing within 10mV of the rails?
LT6221CDD#TRPBF achieves rail-to-rail output via complementary Class AB output transistors with optimized biasing. At ISINK = 20mA, VOL is ≤650mV (typical 325mV); at ISOURCE = 20mA, VOH is ≤900mV (typical 475mV). With light loads (<1mA), output swing is within 10mV of either rail - verified in Electrical Characteristics tables for TA = 25°C and 0°C to 70°C ranges. This behavior is intrinsic to the LT6221CDD#TRPBF output stage design and requires no external components.
Is LT6221CDD#TRPBF pin-compatible with other op amps in SO-8 packages?
No, LT6221CDD#TRPBF is not pin-compatible with standard SO-8 op amps. Its DFN-8 (3mm × 3mm) package has a different pinout: pins 1–3 and 6–8 are functional (OUT A, –IN A, +IN A, OUT B, –IN B, +IN B), while pins 4 and 5 are VS– and VS+. In contrast, SO-8 versions (e.g., LT6221CS8#TRPBF) follow industry-standard op amp pinout. PCB layout must be specific to the DFN footprint - LT6221CDD#TRPBF cannot serve as a drop-in replacement for SO-8 devices without redesign.
LT6221CDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 60 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 250 nA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 900µA (x2 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT6221CDD#TRPBF FAQ
1.How can I place an order for LT6221CDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6221CDD#TRPBF 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 LT6221CDD#TRPBF reliable?
The price and inventory of LT6221CDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6221CDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT6221CDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6221CDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6221CDD#TRPBF?
LT6221CDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6221CDD#TRPBF 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 LT6221CDD#TRPBF?
For technical support, including LT6221CDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6221CDD#TRPBF requirements.
6.How does Aetrix verify that LT6221CDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT6221CDD#TRPBF 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 LT6221CDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT6221CDD#TRPBF?
All LT6221CDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6221CDD#TRPBF, 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 LT6221CDD#TRPBF part is unused and in its original packaging.
Return procedure for LT6221CDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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