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Analog Devices Inc. LT1881AIS8#TRPBF
- Part No.:
- LT1881AIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1881AIS8#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
LT1881AIS8#TRPBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail output, picoamp-input precision operational amplifier optimized for high-accuracy signal conditioning in low-power, single-supply systems. It features 50 μV max input offset voltage, 200 pA max input bias current, rail-to-rail output swing within 40 mV of V– and 220 mV of V+, and operates from 2.7 V to 36 V total supply. It is used in thermocouple amplifiers, bridge transducer conditioners, and battery-powered instrumentation.
For engineers reviewing the LT1881AIS8#TRPBF datasheet, LT1881AIS8#TRPBF pinout, LT1881AIS8#TRPBF application, or LT1881AIS8#TRPBF equivalent, key selection criteria include ultralow input bias current stability over temperature, guaranteed rail-to-rail output performance at ±15 V and 5 V supplies, matched amplifier characteristics for differential sensing, and direct drive capability for 1000 pF capacitive loads in unity-gain follower configurations.
Technical Context
The LT1881AIS8#TRPBF integrates two matched precision op amps in a single SO-8 package, with input stage architecture optimized for picoamp-level bias current cancellation and sub-50 μV trimmed offset. Its internal compensation ensures unity-gain stability with up to 1000 pF capacitive load without external compensation.
It supports both single-supply (e.g., 5 V, 0 V) and split-supply (e.g., ±15 V) operation, with input common-mode range limited to V– + 1.0 V to V+ – 1.0 V and full rail-to-rail output swing specified across –40°C to 85°C. Channel matching parameters-including offset voltage match (≤70 μV), bias current match (≤300 pA), and CMRR match (≥102 dB)-are explicitly characterized for dual-amplifier correlation in precision differential circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 50 μV maximum - enables high-resolution DC-coupled measurement without calibration drift in 16-bit DAC output buffers. |
| Input Bias Current | 200 pA maximum - preserves accuracy with high-impedance sources (>10 MΩ) such as photodiodes or pH electrodes. |
| Rail-to-Rail Output Swing | Within 40 mV of V– and 220 mV of V+ - maximizes dynamic range in low-voltage single-supply systems (e.g., 3.3 V or 5 V). |
| Supply Range | 2.7 V to 36 V total - supports wide industrial input rails including 3.3 V, 5 V, ±5 V, ±12 V, and ±15 V without redesign. |
| Capacitive Load Drive | Stable with 1000 pF at AV = 1 - eliminates need for isolation resistors in sensor interface filters or ADC driver stages. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems requiring extended thermal reliability. |
| Offset Voltage Drift | 0.8 μV/°C maximum - ensures <100 μV total offset shift over full temperature range, critical for unattended long-term monitoring. |
Pinout & Package
LT1881AIS8#TRPBF is housed in an 8-lead plastic SO (S8) package, 3.988 mm × 4.902 mm × 1.752 mm, with gull-wing leads and Pb-free (RoHS-compliant) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Delivers rail-to-rail buffered signal; capable of sourcing/sinking ≥1 mA while maintaining 220 mV headroom to V+ and 40 mV to V–. |
| 2 (–IN A) | Inverting input A | High-impedance node (≥100 GΩ common-mode); requires guard ring layout to prevent leakage-induced error. |
| 3 (+IN A) | Non-inverting input A | Matches –IN A in bias current (ΔIB+ ≤300 pA); no external balancing resistors needed due to on-chip cancellation. |
| 4 (V–) | Negative supply | Reference for dual-supply operation or ground for single-supply; must be decoupled with ≥0.1 μF ceramic capacitor. |
| 5 (V+) | Positive supply | Accepts 2.7 V to 36 V total supply; PSRR ≥106 dB ensures immunity to supply ripple in noisy environments. |
| 6 (+IN B) | Non-inverting input B | Matched to +IN A for differential pair use; offset voltage match ≤70 μV enables <0.005% gain error in instrumentation amp front-ends. |
| 7 (–IN B) | Inverting input B | Paired with +IN B for second channel; common-mode rejection ratio ≥104 dB minimizes interference in balanced sensor interfaces. |
| 8 (OUT B) | Amplifier B output | Independent rail-to-rail output; channel separation ≥120 dB prevents crosstalk in dual-channel data acquisition. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Input Bias Current | 200 pA max enables accurate amplification of nanoamp-level currents from high-Z sensors without signal degradation. |
| Trimmed Input Offset Voltage | 50 μV max ensures baseline error remains below 0.1% of full-scale in 50 mV span bridge measurements. |
| Rail-to-Rail Output Stage | Swings to within 40 mV of V– and 220 mV of V+ at 1 mA load-maximizes usable output range in 3.3 V and 5 V systems. |
| Unity-Gain Stable with 1000 pF | Eliminates need for external series resistor or feedback capacitor when driving ADC input filters or long cables. |
| Matched Dual Amplifier Pair | Offset voltage match ≤70 μV and bias current match ≤300 pA support precise differential gain and common-mode rejection in INAs. |
Applications
| Thermocouple Amplifiers | Bridge Transducer Conditioners |
|---|---|
Use Scenario: Amplifying microvolt-level Seebeck voltages from K-type thermocouples across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with cold-junction compensation interface. Use Value: 200 pA input bias current prevents voltage drop across high-resistance thermocouple leads; 50 μV offset contributes <0.5°C error at 0°C reference. | Use Scenario: Conditioning Wheatstone bridge outputs from strain gauges in structural health monitoring. IC Role / Device Role / Timing Role: First-stage differential amplifier with matched channels for common-mode rejection. Use Value: ≤70 μV offset match between channels maintains >80 dB CMRR in 350 Ω bridge designs; rail-to-rail output drives 16-bit SAR ADC directly. |
| Instrumentation Amplifiers | Battery-Powered Systems |
Use Scenario: Building 3-op-amp INAs for medical ECG front-ends requiring <1 μV input-referred noise. IC Role / Device Role / Timing Role: Dual matched amplifier providing gain and buffer stages in discrete INA topology. Use Value: 0.8 μV/°C drift limits temperature-induced gain error to <0.02%/°C; 0.65 mA per amplifier enables multi-channel operation on coin-cell power. | Use Scenario: Signal conditioning in portable gas detectors using electrochemical sensors with nA-level output. IC Role / Device Role / Timing Role: Low-power, high-Z sensor interface amplifier operating from 3.3 V Li-ion supply. Use Value: 2.7 V minimum supply allows operation down to 3.0 V battery voltage; 200 pA bias current preserves sensor linearity without active biasing circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Lower offset drift (0.005 μV/°C), higher supply current (1 mA), no guaranteed 1000 pF unity-gain stability | Better for ultra-stable DC references; less suitable for capacitive-load ADC drivers | Select OPA2188AIDR only if drift dominates design; verify stability with target CL before layout. |
| ADA4522-2ARZ | Zero-drift architecture, 2.5 μV max offset, higher quiescent current (1.2 mA), lower GBW (3 MHz) | Superior long-term stability for metrology; insufficient slew rate for fast settling in data acquisition | Choose ADA4522-2ARZ for calibration-grade instruments; avoid where 30 μs 0.01% settling is required. |
Compared with OPA2188AIDR and ADA4522-2ARZ, LT1881AIS8#TRPBF delivers optimal balance of picoamp input bias, guaranteed 1000 pF drive, and industrial temperature range-making it uniquely suited for battery-powered sensor interfaces where leakage and layout constraints dominate.
Availability
LT1881AIS8#TRPBF is available at Aetrix Electronics and suitable for thermocouple amplifiers, bridge transducer conditioners, and battery-powered instrumentation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1881AIS8#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1881AIS8#TRPBF belongs to ADI's precision op amp product line, designed specifically for high-accuracy, low-power signal conditioning in industrial, medical, and test equipment where input bias current, offset voltage, and temperature stability are critical.
FAQ
What is the maximum capacitive load the LT1881AIS8#TRPBF can drive while remaining stable in unity-gain configuration?
The LT1881AIS8#TRPBF is specified to remain stable with up to 1000 pF capacitive load in unity-gain follower configuration, as confirmed in the Electrical Characteristics table and Typical Performance Characteristic G10–G11. This eliminates the need for external isolation resistors in ADC input buffering or RC filter driving applications, provided PCB layout follows recommended grounding and decoupling practices.
Does the LT1881AIS8#TRPBF support true rail-to-rail input operation?
No, the LT1881AIS8#TRPBF does not support rail-to-rail input operation. Its input common-mode voltage range is specified as V– + 1.0 V to V+ – 1.0 V, meaning inputs must stay at least 1 V away from each supply rail. However, its output stage delivers true rail-to-rail swing-within 40 mV of V– and 220 mV of V+-making it ideal for output buffering in single-supply systems.
How does the input bias current matching between amplifiers A and B affect differential applications?
The LT1881AIS8#TRPBF specifies ΔIB+ ≤300 pA (noninverting bias current match) and ΔVOS ≤70 μV between its two amplifiers. In differential configurations-such as instrumentation amplifier front-ends-this tight matching minimizes gain error and common-mode rejection degradation. For example, in a 350 Ω bridge with 10 kΩ feedback, mismatch-induced CMRR loss is held below 1 dB across –40°C to +85°C.
What is the supply current consumption of the LT1881AIS8#TRPBF at 5 V single supply?
At 5 V single supply (VS = 5 V, 0 V), the LT1881AIS8#TRPBF draws 0.65 mA per amplifier typical and 0.9 mA maximum, as stated in the Electrical Characteristics table under IS (Supply Current Per Amplifier). Total device current is therefore 1.3 mA typical and 1.8 mA maximum-enabling multi-channel operation in power-constrained battery-powered systems.
Is the LT1881AIS8#TRPBF pin-compatible with other members of the LT1881 family?
Yes, the LT1881AIS8#TRPBF shares the standard S8 (8-lead SO) pinout with all LT1881 variants in SO packaging-including LT1881CS8#TRPBF, LT1881IS8#TRPBF, and LT1881ACS8#TRPBF-as confirmed in the Order Information table and Pin Configuration diagram. This allows direct substitution within the same grade (I-grade) and package, provided offset, drift, and bias current specifications meet system requirements.
LT1881AIS8#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:
- 0.4V/µs
- Gain Bandwidth Product:
- 850 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 850µA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1881AIS8#TRPBF FAQ
1.How can I place an order for LT1881AIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1881AIS8#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 LT1881AIS8#TRPBF reliable?
The price and inventory of LT1881AIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1881AIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1881AIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1881AIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1881AIS8#TRPBF?
LT1881AIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1881AIS8#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 LT1881AIS8#TRPBF?
For technical support, including LT1881AIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1881AIS8#TRPBF requirements.
6.How does Aetrix verify that LT1881AIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1881AIS8#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 LT1881AIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1881AIS8#TRPBF?
All LT1881AIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1881AIS8#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 LT1881AIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1881AIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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