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Analog Devices Inc. LT6221IS8#TRPBF
- Part No.:
- LT6221IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT6221IS8#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:8,103
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Product details
Overview
LT6221IS8#TRPBF from Analog Devices (formerly Linear Technology) is a single, rail-to-rail input and output precision operational amplifier optimized for low-power, high-speed signal conditioning in 3V–5V systems. It delivers 60MHz gain-bandwidth product, 20V/µs slew rate, <350µV input offset voltage, 1.1mA supply current per amplifier, and rail-to-rail output swing within 10mV of either supply - enabling high-fidelity buffering and driving of ADC inputs in portable instrumentation.
For engineers reviewing the LT6221IS8#TRPBF datasheet, LT6221IS8#TRPBF pinout, LT6221IS8#TRPBF application, or LT6221IS8#TRPBF equivalent, key selection criteria include guaranteed –40°C to 85°C operation, SO-8 standard op amp pinout compatibility, low 10nV/√Hz input voltage noise, and robust rail-to-rail common-mode range (0V to VS) - critical for precision sensor interfaces and low-voltage data acquisition.
Technical Context
The LT6221IS8#TRPBF employs a dual-input-stage architecture with PNP and NPN differential pairs that auto-switch across the full input common-mode range (VS– to VS+), eliminating phase reversal and enabling true rail-to-rail input operation. Its output stage uses complementary Class AB topology to sustain ±50mA peak current while maintaining 10mV rail-to-rail swing at 5mA load.
Designed for stability with capacitive loads up to 1000pF (with optional series output resistor), it features 102dB typical CMRR and 105dB PSRR - ensuring accurate amplification in noisy industrial or mixed-signal environments where supply and ground disturbances are present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 60MHz - supports stable closed-loop gain ≥2 up to 30MHz, suitable for anti-aliasing filters and video signal paths. |
| Slew Rate | 20V/µs - enables clean 4VP-P output at 1MHz without slewing distortion in fast-settling applications. |
| Input Offset Voltage | 350µV max (–40°C to 85°C) - ensures ≤0.007% gain error in 5V full-scale precision measurement circuits. |
| Supply Current | 1.1mA max (–40°C to 85°C) - allows battery-powered designs to achieve >100-hour runtime with 10µA sleep modes. |
| Input Voltage Noise | 10nV/√Hz @ 10kHz - preserves SNR in low-level sensor front-ends such as strain gauge or thermopile amplifiers. |
| Output Swing | Within 10mV of rails @ no load - maximizes dynamic range in 3.3V ADC driver stages, delivering >3.28VP-P signal swing. |
| Common-Mode Range | 0V to VS - accepts inputs directly from resistive sensors tied to ground or supply without level-shifting. |
Pinout & Package
LT6221IS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package with industry-standard op amp pinout and thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Capable of sourcing/sinking ±50mA; rail-to-rail swing enables direct interface to SAR ADC reference buffers. |
| 2 - –IN | Inverting input | Differential pair node; matched to +IN for <175µV offset voltage match in dual/quad variants (not applicable here). |
| 3 - +IN | Non-inverting input | High-impedance node (IB < 200nA); supports high-Z sensor connections without significant loading error. |
| 4 - V– | Negative supply | Reference for internal biasing; exposed pad (in DFN variants) connects internally to V–, but SO-8 has no exposed pad. |
| 5 - NC | No connect | Internally unused; must be left floating or grounded per layout best practices to minimize parasitic coupling. |
| 6 - NC | No connect | Internally unused; same handling as Pin 5 - no routing or stitching required. |
| 7 - V+ | Positive supply | Accepts 2.2V–12.6V single-supply or ±2.5V–±5V dual-supply; PSRR >104dB rejects supply ripple. |
| 8 - NC | No connect | Internally unused; electrically isolated - no connection needed on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interfacing with 0–3.3V or 0–5V sensors and ADCs without external level-shifting circuitry. |
| Low input bias current (<200nA) | Minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiode transimpedance feedback networks). |
| 60MHz GBW with 1.1mA quiescent current | Delivers high-speed performance at ultra-low power - 3× faster than comparable micropower op amps like LTC6241. |
| 102dB CMRR and 105dB PSRR | Rejects interference from shared ground returns and noisy digital supplies in mixed-signal PCB layouts. |
| Specified over –40°C to 85°C | Guarantees parametric performance in industrial temperature environments without derating or margining. |
Applications
| Instrumentation Amplifier Front-End | ADC Driver for SAR Converters |
|---|---|
Use Scenario: Amplifying low-level mV-range signals from bridge-based pressure or load-cell sensors in handheld test equipment. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with <350µV offset and <10nV/√Hz noise, placed before programmable-gain instrumentation amplifier. Use Value: Maintains system ENOB >16 bits at 100ksps by contributing <0.5 LSB of integrated noise and offset error over temperature. | Use Scenario: Driving the input of a 16-bit, 1MSPS SAR ADC (e.g., AD7960) in automated test equipment. IC Role / Device Role / Timing Role: Low-output-impedance buffer with 20V/µs slew rate and rail-to-rail swing to settle 4V step within 300ns (0.01%). Use Value: Eliminates external RC filter requirements and guarantees monotonicity during ADC acquisition window. |
| Active Filter for Medical ECG | Rail-to-Rail Sensor Interface |
Use Scenario: 2nd-order Sallen-Key high-pass filter (0.05Hz cutoff) and 3rd-order low-pass filter (150Hz) in portable ECG front-end. IC Role / Device Role / Timing Role: Dual-function op amp implementing both filter sections with unity-gain stability and low 1/f noise. Use Value: Achieves <1µVPP integrated noise in 0.05–150Hz band and eliminates baseline wander via true rail-to-rail input common-mode range. | Use Scenario: Direct interface to 3.3V-output MEMS accelerometer or gyroscope with analog output pins referenced to AVDD and AGND. IC Role / Device Role / Timing Role: Level-shift-free buffer isolating noisy digital domains while preserving full 0–3.3V dynamic range. Use Value: Avoids signal clipping at supply rails and reduces BOM count by removing discrete level-shifter ICs or resistor dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA350UA | Lower GBW (38MHz), higher supply current (4.9mA), same SO-8 pinout; 11nV/√Hz noise. | Better DC precision (25µV VOS) but insufficient speed for >500kHz closed-loop use. | Select when ultra-low offset dominates over bandwidth and power - not for high-speed ADC drivers. |
| ADA4807-1ARZ | Higher GBW (180MHz), lower noise (3.9nV/√Hz), 1.2mA IQ, same SO-8 pinout; specified –40°C to 125°C. | Superior speed/noise trade-off but requires careful compensation for capacitive loads >100pF. | Select for demanding wideband applications (e.g., ultrasound receive chains) where layout allows tight feedback control. |
Compared with OPA350UA and ADA4807-1ARZ, the LT6221IS8#TRPBF offers the optimal balance of 60MHz bandwidth, sub-350µV offset, and 1.1mA quiescent current in a drop-in SO-8 footprint - making it ideal for cost-sensitive, battery-powered precision signal chains where speed and power are co-constrained.
Availability
LT6221IS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial data loggers, and medical sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT6221IS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT6221 belongs to ADI's legacy Linear Technology precision op amp portfolio, engineered specifically for low-power, rail-to-rail signal conditioning in space- and energy-constrained applications - emphasizing speed/power efficiency without sacrificing DC accuracy.
FAQ
What is the maximum operating supply voltage for LT6221IS8#TRPBF?
The LT6221IS8#TRPBF has an absolute maximum total supply voltage (VS+ to VS−) of 12.6V. It operates reliably across a recommended supply range of 2.2V to 12.6V - including single 3.3V, 5V, or dual ±2.5V/±5V configurations. Operation beyond 12.6V risks permanent damage per Absolute Maximum Ratings.
Does LT6221IS8#TRPBF support rail-to-rail input with input voltages beyond the supply rails?
Yes - the LT6221IS8#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 extends from VS− to VS+, and the device tolerates differential input voltages up to ±1.4V. Exceeding ±1.4V requires limiting input current to <10mA per Absolute Maximum Ratings.
What is the typical output drive capability of LT6221IS8#TRPBF at 3.3V supply?
At 3.3V single supply, the LT6221IS8#TRPBF delivers typical output swing within 10mV of each rail (0.01V to 3.29V) with no load, and sustains ≥20mA sink/source current while maintaining <100mV saturation voltage. This enables direct driving of 50Ω transmission lines or 1kΩ ADC input networks without external buffers.
Is LT6221IS8#TRPBF pin-compatible with other op amps in SO-8 package?
Yes - the LT6221IS8#TRPBF uses the industry-standard SO-8 op amp pinout (OUT, –IN, +IN, V–, NC, NC, V+, NC), matching pin-for-pin layouts of LMV321, OPA344, and ADA4805-1. However, electrical behavior (e.g., bandwidth, noise, supply current) differs significantly; verify loop stability and settling time in final design.
How does LT6221IS8#TRPBF handle capacitive loads in buffer configurations?
The LT6221IS8#TRPBF remains stable driving up to 1000pF with a 10Ω–20Ω series output resistor. Without added resistance, it may oscillate with >100pF loads due to phase margin reduction. For direct capacitive loading (e.g., ADC sample-hold inputs), always include ROS = 10Ω and verify stability using the gain vs frequency plots in the datasheet Figure 25.
LT6221IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT6221IS8#TRPBF FAQ
1.How can I place an order for LT6221IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6221IS8#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 LT6221IS8#TRPBF reliable?
The price and inventory of LT6221IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6221IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT6221IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6221IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6221IS8#TRPBF?
LT6221IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6221IS8#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 LT6221IS8#TRPBF?
For technical support, including LT6221IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6221IS8#TRPBF requirements.
6.How does Aetrix verify that LT6221IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT6221IS8#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 LT6221IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT6221IS8#TRPBF?
All LT6221IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6221IS8#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 LT6221IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT6221IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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