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Analog Devices Inc. LT1112IS8
- Part No.:
- LT1112IS8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1112IS8.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,916
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Product details
Overview
LT1112IS8 from Analog Devices (formerly Linear Technology) is a dual precision operational amplifier optimized for low-power, picoampere-input, microvolt-offset instrumentation applications. It delivers 75 µV max input offset voltage, 250 pA max input bias current, and 400 µA max supply current per amplifier at ±15 V - enabling high-accuracy signal conditioning in battery-powered thermocouple amplifiers and bridge sensor interfaces.
For engineers reviewing the LT1112IS8 datasheet, LT1112IS8 pinout, LT1112IS8 application, or LT1112IS8 equivalent, this page provides verified specifications, SO-8 package pin mapping, matching performance data for instrumentation amplifier designs, and validated alternatives for low-drift, low-IB dual op amp selection.
Technical Context
The LT1112IS8 employs a matched-pair bipolar input stage with back-to-back diode input protection, supporting rail-to-rail input overvoltage tolerance up to ±20 V while maintaining clean clipping without phase reversal. Its design emphasizes inter-amplifier matching - including ∆VOS ≤ 100 µV and ∆IB+ ≤ 450 pA - critical for two- and three-op-amp instrumentation topologies.
Guaranteed operation down to ±1.0 V supplies enables direct use with nearly depleted AA cells (±1.3 V), and its 0.3 µVP-P 0.1–10 Hz noise and 120 dB CMRR support high-resolution DC-coupled measurements in industrial sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 75 µV max (low-cost grade, SO-8 package) - enables sub-100 µV system offset in precision transducer interfaces |
| Input Bias Current | 250 pA max - preserves high-impedance source integrity in photodiode and pH electrode amplifiers |
| Supply Current per Amp | 400 µA max at ±15 V - supports >1-year battery life in portable instrumentation with dual-channel operation |
| CMRR | 120 dB min - rejects common-mode interference in bridge circuits with 0.1% resistor matching |
| Gain-Bandwidth Product | 750 kHz typ - sufficient for stable gain-of-1000 instrumentation amplifier configurations up to ~7 kHz |
| Offset Voltage Drift | 0.5 µV/°C max - limits thermal drift to <1.5 µV over 0°C to 85°C operating range |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and automotive cabin electronics environments |
Pinout & Package
S8 package: 8-lead plastic small-outline (SOIC-N), 150-mil width, standard dual op amp pinout. RoHS-compliant, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives feedback networks or downstream ADC drivers with ±13 V swing into 10 kΩ |
| 2 | –IN A | Inverting input of Amp A - accepts differential signals in instrumentation amplifier first stage |
| 3 | +IN A | Noninverting input of Amp A - connects to high-Z sensor nodes with 800 GΩ common-mode input resistance |
| 4 | V– | Negative supply rail - shared by both amplifiers; must be decoupled locally for channel separation >150 dB |
| 5 | V+ | Positive supply rail - supports single-supply operation down to +2.7 V when referenced to V– = 0 V |
| 6 | OUT B | Amplifier B output - independent output for second channel; no crosstalk impact on Amp A settling |
| 7 | –IN B | Inverting input of Amp B - used for matched gain-setting resistors in three-op-amp IA topologies |
| 8 | +IN B | Noninverting input of Amp B - maintains identical bias current match (∆IB+) with Pin 3 for offset cancellation |
Key Features
| Feature | Design Value |
|---|---|
| Picoampere input bias | 250 pA max ensures <1 µV error from 10 MΩ source impedance in precision bridge amplifiers |
| Guaranteed matching specs | ∆VOS ≤ 100 µV and ∆IB+ ≤ 450 pA enable accurate offset cancellation in 3-op-amp IAs |
| Low-voltage operation | Functional at ±1.0 V supplies - allows direct use with two AA cells down to 1.3 V total |
| No phase reversal | Clean output clipping when inputs exceed common-mode range - avoids system latch-up in overvoltage events |
| 0.1–10 Hz noise | 0.3 µVP-P supports high-resolution DC measurements in weigh scales and medical sensors |
Applications
| Thermocouple Amplifier | Bridge Sensor Interface |
|---|---|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K thermocouples in industrial process controllers. IC Role / Device Role / Timing Role: First-stage low-noise, low-drift instrumentation amplifier core using matched LT1112IS8 dual op amps. Use Value: 0.5 µV/°C drift and 0.3 µVP-P 0.1–10 Hz noise enable ±0.5°C accuracy over –40°C to +85°C without cold-junction compensation trimming. | Use Scenario: Signal conditioning for 350 Ω strain-gauge load cells in factory automation weighing systems. IC Role / Device Role / Timing Role: Dual-channel differential amplifier driving 16-bit SAR ADC with matched gain and offset tracking. Use Value: Guaranteed ∆VOS ≤ 100 µV and ∆CMRR ≥ 113 dB ensure <0.02% linearity error across full temperature range. |
| Photo Current Amplifier | Battery-Powered Portable Instrument |
Use Scenario: Converting pA-level photocurrents from UV photodiodes in handheld spectrometers. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with ultra-low IB preserving dynamic range at high RF. Use Value: 250 pA max IB enables 100 MΩ TIA gain without significant input error - extending measurable current range to 100 fA. | Use Scenario: Powering handheld environmental monitors (CO₂, humidity) with two AA batteries. IC Role / Device Role / Timing Role: Dual-channel analog front-end for sensor excitation and signal conditioning with shared low-quiescent supply. Use Value: 400 µA per amplifier at ±1.3 V enables >2-year battery life while maintaining 75 µV offset and 120 dB CMRR. |
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 |
|---|---|---|---|
| OP297GSZ | Higher offset drift (1.0 µV/°C max), higher supply current (500 µA/amp), same SO-8 pinout | Less suitable for wide-temperature battery-powered instruments requiring long-term stability | Select LT1112IS8 when <0.5 µV/°C drift and sub-450 µA supply current are mandatory |
| AD706ARZ | Lower input bias (15 pA max), but higher offset (150 µV max), wider SO-8 body (300-mil) | Preferred for femtoamp applications with less stringent offset requirements | Choose AD706ARZ only if ultra-low IB outweighs need for <100 µV offset and tight matching |
Compared with OP297GSZ and AD706ARZ, the LT1112IS8 uniquely balances picoampere input bias, microvolt offset, guaranteed matching, and ultra-low supply current in a narrow SO-8 package - making it optimal for cost-sensitive, battery-operated instrumentation where channel-to-channel tracking and thermal stability are critical.
Availability
LT1112IS8 is available at Aetrix Electronics and suitable for thermocouple amplifiers, bridge sensor interfaces, photo current amplifiers, and battery-powered portable instruments requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1112IS8 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 full product support, datasheet documentation, and long-term supply commitment for legacy Linear parts including the LT1112 series.
The LT1112 product line was designed specifically for precision, low-power instrumentation applications - emphasizing matched dual architectures, picoampere input stages, and guaranteed performance down to ±1 V supplies for portable and industrial sensor signal chains.
FAQ
What is the maximum input offset voltage specification for LT1112IS8?
The LT1112IS8 has a maximum input offset voltage of 75 µV in the low-cost grade (including surface-mount SO-8 packages), as specified in the Linear Technology datasheet under "Offset Voltage – Low Cost Grade." This value applies across the full –40°C to +85°C operating temperature range and is guaranteed for every unit shipped.
Does LT1112IS8 support operation from a single 3V supply?
Yes, the LT1112IS8 operates from a single 3V supply (V+ = 3V, V– = 0V) with rail-to-rail input common-mode range extending to within 800 mV of each rail. Output swing reaches ±11 V into 2 kΩ with ±15 V supplies, and typical output swing is >2.2 V peak-to-peak with 3V single supply and 10 kΩ load, confirmed in Figure TPC17 of the datasheet.
Is LT1112IS8 pin-compatible with OP297 or AD706?
The LT1112IS8 uses the industry-standard SO-8 dual op amp pinout (OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B), making it directly pin-compatible with OP297 and AD706 in narrow-body (150-mil) SOIC packages. However, AD706ARZ uses a wider 300-mil SOIC body, requiring PCB layout revision for drop-in replacement.
What is the guaranteed input bias current for LT1112IS8?
The LT1112IS8 guarantees a maximum input bias current of ±250 pA at 25°C, with the full –40°C to +85°C operating range covered by the "●" symbol in the Electrical Characteristics table. This specification is measured with ±15 V supplies and applies to both input terminals, enabling reliable use with high-impedance sources like pH electrodes and photodiodes.
Can LT1112IS8 be used in a three-op-amp instrumentation amplifier?
Yes - the LT1112IS8 is explicitly designed for this topology. Its guaranteed matching parameters (∆VOS ≤ 100 µV, ∆IB+ ≤ 450 pA, ∆CMRR ≥ 113 dB) ensure precise offset cancellation and common-mode rejection in standard three-op-amp IAs, as demonstrated in Figure AI02 of the LT1112/LT1114 datasheet using two LT1112IS8 amplifiers.
LT1112IS8 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:
- -
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 750 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 80 pA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 350µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1112IS8 FAQ
1.How can I place an order for LT1112IS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1112IS8 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 LT1112IS8 reliable?
The price and inventory of LT1112IS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1112IS8 is usually 5 days.
3.What payment methods are accepted for LT1112IS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1112IS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1112IS8?
LT1112IS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1112IS8 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 LT1112IS8?
For technical support, including LT1112IS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1112IS8 requirements.
6.How does Aetrix verify that LT1112IS8 is sourced from the original manufacturer or authorized distributors?
All LT1112IS8 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 LT1112IS8 meets industry standards.
7.What is the process for return or replacement of LT1112IS8?
All LT1112IS8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1112IS8, 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 LT1112IS8 part is unused and in its original packaging.
Return procedure for LT1112IS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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