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Analog Devices Inc. LT1881IS8#PBF
- Part No.:
- LT1881IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1881IS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:421
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Product details
Overview
LT1881IS8#PBF 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 delivers 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 stable unity-gain operation with up to 1000 pF capacitive load - ideal for thermocouple amplifiers and battery-powered instrumentation.
For engineers reviewing the LT1881IS8#PBF datasheet, LT1881IS8#PBF pinout, LT1881IS8#PBF application, or LT1881IS8#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, SO-8 package compatibility, dual-channel matching performance (ΔVOS ≤ 125 μV), low 1 mA max supply current per amplifier, and robust common-mode rejection (106 dB min).
Technical Context
The LT1881IS8#PBF employs a precision bipolar input stage with on-chip offset trimming and bias current cancellation circuitry, enabling ultralow input error sources without external nulling. Its architecture supports stable operation at AV = 1 with CL = 1000 pF while maintaining 0.8 μV/°C max offset drift and >100 dB PSRR over 2.7 V to 36 V supply range.
It operates across single supplies (e.g., +5 V, 0 V) or split supplies (±15 V), with input common-mode range limited to V– +1.0 V to V+ –1.0 V - distinct from its rail-to-rail output capability. Channel separation exceeds 120 dB at 1 kHz, ensuring minimal crosstalk in dual-sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 50 μV maximum (guaranteed over –40°C to +85°C); enables sub-16-bit accuracy in 5 V full-scale systems without calibration. |
| Input Bias Current | 200 pA maximum (–40°C to +85°C); preserves gain accuracy with >10 MΩ source impedances and feedback networks. |
| Rail-to-Rail Output | Swings to within 40 mV of V– and 220 mV of V+ at 5 mA load; supports wide dynamic range in low-voltage single-supply data acquisition. |
| Supply Range | 2.7 V to 36 V total; allows direct interface with Li-ion batteries (3.0–4.2 V), industrial 24 V rails, and legacy ±15 V systems. |
| Capacitive Load Drive | Stable at unity gain with up to 1000 pF; eliminates need for isolation resistors in sensor buffer or DAC output stages. |
| Open-Loop Gain | 1 million minimum (1 V/mV) into 10 kΩ; ensures <0.01% gain error in precision gain blocks with 100× closed-loop gain. |
| Operating Temp Range | –40°C to +85°C (Industrial grade); qualified for automotive cabin, industrial PLC, and outdoor metering environments. |
Pinout & Package
LT1881IS8#PBF is housed in an 8-lead plastic SO (S8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, with standard dual-op-amp pinout compatible with industry-wide PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load; rail-to-rail swing enables full utilization of ADC reference range. |
| 2 (–IN A) | Inverting input A | High-impedance node; guard ring layout recommended to prevent leakage-induced offset errors. |
| 3 (+IN A) | Noninverting input A | Matched bias current path; avoid equalizing input resistances - keep both impedances low. |
| 4 (V–) | Negative supply rail | Reference for all internal circuitry; decoupling capacitor required near pin for stability. |
| 5 (+IN B) | Noninverting input B | Independent channel input; same precision specs as Channel A; enables differential pair or dual-sensor buffering. |
| 6 (–IN B) | Inverting input B | Electrically isolated from Channel A inputs; ΔVOS match ≤125 μV ensures matched DC response. |
| 7 (OUT B) | Amplifier B output | Identical AC/DC performance to OUT A; supports independent signal paths without cross-coupling. |
| 8 (V+) | Positive supply rail | Accepts 2.7–36 V; PSRR ≥106 dB minimizes supply noise injection into output signals. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Input Bias Current | 200 pA max enables accurate amplification of nanoamp-level photodiode or electrochemical sensor currents. |
| Trimmed Input Offset | 50 μV max (–40°C to +85°C) reduces system calibration burden and improves long-term measurement repeatability. |
| Rail-to-Rail Output Swing | Delivers >98% of full supply range at 5 mA load, maximizing SNR in 12–16-bit SAR ADC front-ends. |
| Unity-Gain Stable with 1000 pF | Eliminates need for external compensation in DAC output buffers or piezoelectric sensor interfaces. |
| High Common-Mode Rejection | 106 dB min suppresses noise from shared ground paths in multi-channel industrial I/O modules. |
Applications
| Thermocouple Amplifiers | Bridge Transducer Conditioners |
|---|---|
Use Scenario: Amplifying µV-level Seebeck voltages from K-type thermocouples in HVAC control panels. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with cold-junction compensation interface. Use Value: 50 μV max VOS and 0.8 μV/°C drift enable ±0.5°C accuracy over –20°C to +70°C ambient without software correction. | Use Scenario: Conditioning mV-output Wheatstone bridge signals from strain gauges in load cells. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance instrumentation amplifier front-end. Use Value: 200 pA max IB preserves bridge balance accuracy; rail-to-rail output drives 16-bit ADC reference directly. |
| Instrumentation Amplifiers | Battery-Powered Systems |
Use Scenario: Building 3-op-amp IA configurations for medical ECG front-ends requiring >100 dB CMRR. IC Role / Device Role / Timing Role: Dual-channel matched amplifier providing gain and common-mode rejection. Use Value: ΔVOS ≤125 μV and ΔCMRR ≥102 dB ensure channel-to-channel matching critical for high-fidelity biopotential acquisition. | Use Scenario: Signal conditioning in portable gas analyzers powered by two AA cells (3.0 V nominal). IC Role / Device Role / Timing Role: Low-quiescent-current sensor interface amplifier operating from 2.7 V supply. Use Value: 1 mA max IS per amplifier extends battery life beyond 12 months in 10-second wake-up intervals. |
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 |
|---|---|---|---|
| OP2177ARZ-REEL7 | Lower VOS (25 μV typ), higher supply current (1.2 mA), no guaranteed 1000 pF unity-gain stability. | Better DC accuracy but less suitable for capacitive DAC buffers or piezo sensors. | Prefer when ultra-low offset dominates over capacitive drive and power budget. |
| AD8628ARZ-REEL7 | Zero-drift architecture, 1 μV max VOS, 1.2 mA IS, limited 2.7–5.5 V supply range. | Superior long-term drift performance but incompatible with 12 V or 24 V industrial rails. | Choose for battery-powered metrology where supply is fixed at 3.3 V or 5 V. |
Compared with OP2177ARZ-REEL7 and AD8628ARZ-REEL7, the LT1881IS8#PBF offers broader supply flexibility (2.7–36 V), guaranteed 1000 pF unity-gain stability, and industrial temperature qualification - making it uniquely suited for mixed-rail industrial and automotive subsystems where robustness and design reuse matter more than sub-microvolt offset.
Availability
LT1881IS8#PBF is available at Aetrix Electronics and suitable for thermocouple amplifiers, bridge transducer conditioners, instrumentation amplifiers, battery-powered systems, and photo current amplifiers requiring stable component supply across extended temperature ranges and diverse voltage rails.
Supply support for LT1881IS8#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 precision analog portfolio with rigorous qualification standards for industrial and automotive applications.
The LT1881 series belongs to Linear Technology's precision op amp product line, designed specifically for high-accuracy DC-coupled signal conditioning in sensor interfaces, data acquisition, and instrumentation where low input error, rail-to-rail output, and capacitive load drive are essential.
FAQ
What is the guaranteed input offset voltage specification for LT1881IS8#PBF over its full operating temperature range?
The LT1881IS8#PBF guarantees a maximum input offset voltage of 50 μV over the –40°C to +85°C industrial temperature range. This value is specified for the "A" grade variant and reflects trimmed performance validated across temperature, enabling high-accuracy DC measurements without factory calibration.
Does LT1881IS8#PBF support true rail-to-rail input operation?
No, the LT1881IS8#PBF does not support rail-to-rail input operation. Its input common-mode voltage range is limited to V– +1.0 V to V+ –1.0 V. Exceeding this range causes gain collapse but no phase reversal. The rail-to-rail designation applies only to output swing, which reaches within 40 mV of V– and 220 mV of V+.
Can LT1881IS8#PBF drive a 1000 pF capacitive load in unity-gain configuration without oscillation?
Yes, the LT1881IS8#PBF is explicitly characterized and guaranteed stable in unity-gain follower configuration with up to 1000 pF capacitive load. This capability is confirmed in the datasheet's Electrical Characteristics table and Typical Performance plots (G10–G11), eliminating need for external isolation resistors in DAC output or sensor cable driver applications.
What is the supply current consumption of LT1881IS8#PBF at 5 V single supply?
At 5 V single supply (VS = 5 V, 0 V), the LT1881IS8#PBF consumes a maximum of 0.9 mA per amplifier (1.8 mA total for both channels) over temperature. Typical consumption is 0.65 mA per amplifier, making it suitable for low-power portable instrumentation where quiescent current directly impacts battery runtime.
Is LT1881IS8#PBF pin-compatible with other dual op amps in SO-8 package?
Yes, the LT1881IS8#PBF uses the industry-standard dual op amp pinout for SO-8 packages: Pin 1 = OUT A, Pin 2 = –IN A, Pin 3 = +IN A, Pin 4 = V–, Pin 5 = +IN B, Pin 6 = –IN B, Pin 7 = OUT B, Pin 8 = V+. This matches pinouts of LM358, TL072, and AD8602, enabling drop-in replacement in many existing layouts - provided DC specs and stability requirements are verified.
LT1881IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 150 pA
- Voltage - Input Offset:
- 30 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
LT1881IS8#PBF FAQ
1.How can I place an order for LT1881IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1881IS8#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 LT1881IS8#PBF reliable?
The price and inventory of LT1881IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1881IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1881IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1881IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1881IS8#PBF?
LT1881IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1881IS8#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 LT1881IS8#PBF?
For technical support, including LT1881IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1881IS8#PBF requirements.
6.How does Aetrix verify that LT1881IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1881IS8#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 LT1881IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1881IS8#PBF?
All LT1881IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1881IS8#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 LT1881IS8#PBF part is unused and in its original packaging.
Return procedure for LT1881IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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