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Analog Devices Inc. LT1112IN8#PBF
- Part No.:
- LT1112IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1112IN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:174
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Product details
Overview
LT1112IN8#PBF from Analog Devices (formerly Linear Technology) is a dual precision operational amplifier in 8-lead PDIP package, featuring 75 µV max input offset voltage, 250 pA max input bias current, and 400 µA max supply current per amplifier. It operates down to ±1.0 V supplies and delivers 120 dB min CMRR and 1 million min open-loop gain - optimized for low-power, high-accuracy instrumentation amplifiers and thermocouple signal conditioning.
For engineers reviewing the LT1112IN8#PBF datasheet, LT1112IN8#PBF pinout, LT1112IN8#PBF application, or LT1112IN8#PBF equivalent, key selection criteria include guaranteed matching specs (ΔVOS ≤ 60 µV), picoamp-level input bias, operation on near-dead AA cells, and compatibility with two- and three-op-amp instrumentation topologies requiring tight amplifier-to-amplifier tracking.
Technical Context
The LT1112IN8#PBF integrates two matched JFET-input op amps with independent biasing, enabling stable performance across –40°C to +85°C without inter-channel crosstalk degradation. Its input stage uses supergain transistors and back-to-back diode protection, supporting clean clipping (no phase reversal) when inputs exceed common-mode range.
It guarantees matching parameters including ΔVOS (≤60 µV), ΔIB⁺ (≤140 pA), and ∆CMRR (≥113 dB) over temperature - critical for three-op-amp instrumentation amplifier topologies where error cancellation relies on amplifier pair symmetry rather than absolute parameter values.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 35 µV max (typical), 60 µV max over full –40°C to +85°C range - enables sub-100 µV system-level offset in matched configurations. |
| Input Bias Current | ±110 pA max at –40°C to +85°C - preserves high-impedance sensor interface integrity (e.g., thermocouples, pH electrodes). |
| Supply Current per Amp | 370–450 µA over temperature - supports battery-powered systems operating from ±1.0 V (two AA cells down to ~1.3 V each). |
| Common-Mode Rejection | 117 dB min at ±13.5 V CM range - ensures robust rejection of shared noise in bridge and differential sensor circuits. |
| Gain-Bandwidth Product | 450 kHz min - sufficient for DC-coupled instrumentation, low-frequency active filters (<100 Hz), and precision reference buffering. |
| Output Voltage Swing | ±13.0 V into 10 kΩ at ±15 V supplies - delivers rail-to-rail usable dynamic range for ±12 V output signals. |
| Offset Voltage Match | 50 µV max (ΔVOS) over temperature - directly reduces output offset in two-op-amp instrumentation amplifiers by >90% vs unmatched pairs. |
Pinout & Package
LT1112IN8#PBF is housed in an 8-lead plastic DIP (N8) package with standard dual op amp pinout and 0.300-inch body width. Pin 1 is top-left corner (notch-down orientation), with no internal thermal pad or exposed die attach.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives feedback networks or downstream stages; capable of ±13 V swing into 10 kΩ. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (800 GΩ common-mode RIN) sensitive to PCB leakage. |
| 3 | +IN A | Noninverting input of Amp A - matched to Pin 5 (+IN B) for common-mode rejection in differential configurations. |
| 4 | V– | Negative supply rail - must be decoupled locally; shares return path with other amplifiers but has independent biasing. |
| 5 | +IN B | Noninverting input of Amp B - electrically and thermally matched to Pin 3 for precision differential gain stages. |
| 6 | –IN B | Inverting input of Amp B - symmetrical layout to Pin 2 minimizes thermal gradient-induced drift mismatch. |
| 7 | OUT B | Amplifier B output - fully independent; used for reference buffering, gain-setting, or second channel signal processing. |
| 8 | V+ | Positive supply rail - accepts ±1.0 V to ±20 V; low PSRR drift (113 dB min) maintains accuracy under supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Picoamp input bias | ±110 pA max over –40°C to +85°C - enables direct connection to high-Z sensors (e.g., 100 MΩ thermistor networks) without guard rings. |
| Guaranteed matching specs | ΔVOS ≤ 60 µV, ΔIB⁺ ≤ 140 pA, ∆CMRR ≥ 113 dB - eliminates need for external trimming in 3-op-amp instrumentation amps. |
| Low-voltage operation | Functional at ±1.0 V supplies - powers from two nearly discharged AA cells (≈±1.3 V) with full spec compliance. |
| No phase reversal | Clean output clipping when input exceeds common-mode range - prevents latch-up or system fault in overvoltage transients. |
| High common-mode rejection | 117 dB min at ±13.5 V CM - rejects EMI and ground noise in industrial bridge sensor interfaces (e.g., load cells). |
Applications
| Thermocouple Amplification | Two-Op-Amp Instrumentation Amplifier |
|---|---|
Use Scenario: Amplifying µV-level thermocouple outputs (e.g., Type K, 41 µV/°C) in portable data loggers with battery life >1 year. IC Role / Device Role / Timing Role: LT1112IN8#PBF serves as first-stage low-noise, low-drift preamplifier with cold-junction compensation interface. Use Value: 0.3 µVP-P 0.1–10 Hz noise and 0.5 µV/°C max drift enable ±0.5°C measurement accuracy without calibration. |
Use Scenario: Building compact, low-cost instrumentation amplifier for medical ECG front-ends requiring gain = 1000 and CMRR > 100 dB. IC Role / Device Role / Timing Role: One LT1112IN8#PBF provides matched pair for differential gain stage; second amp buffers reference. Use Value: Guaranteed ΔVOS ≤ 60 µV reduces output offset to <100 µV - eliminating manual trim and improving production yield. |
| Battery-Powered Reference Buffer | Low-Frequency Active Filter |
Use Scenario: Generating stable ±0.617 V reference from two AA cells in handheld multimeters or portable calibrators. IC Role / Device Role / Timing Role: LT1112IN8#PBF configures as dual buffered reference with <20 ppm/°C tempco limited by LT1004-1.2. Use Value: 370 µA per amplifier enables total supply current <750 µA - extending battery life to >2000 hours at 1 mA load. |
Use Scenario: Implementing 2nd-order low-pass filter (fc = 10 Hz) for vibration sensor signal conditioning in predictive maintenance nodes. IC Role / Device Role / Timing Role: LT1112IN8#PBF implements Sallen-Key topology with matched sections for amplitude/phase consistency. Use Value: 450 kHz GBW and 0.24 V/µs slew rate support clean step response with <1% overshoot up to 5 Hz. |
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 |
|---|---|---|---|
| LT1112CN8#PBF | Same silicon, wider temp range (–40°C to +85°C) but only specified over 0°C to +70°C; 27 µV max VOS (vs 30 µV for IN8). | Not guaranteed over full –40°C to +85°C range; suitable for commercial-grade instruments without extended temp validation. | Select LT1112CN8#PBF only if cost sensitivity outweighs guaranteed industrial temperature performance. |
| OP297GPZ | Higher VOS (100 µV max), higher IB (100 pA typ), no guaranteed matching specs; exhibits phase reversal on overdrive. | Lacks ΔVOS/ΔIB⁺ matching - requires external trimming in instrumentation amps; unsuitable for battery-powered low-voltage use. | Choose OP297GPZ only for legacy drop-in replacement where matching and low-voltage operation are not required. |
Compared with LT1112CN8#PBF, LT1112IN8#PBF provides verified –40°C to +85°C performance and tighter matching; versus OP297GPZ, it delivers superior low-voltage operation, guaranteed matching, and no phase reversal - making it the only choice for production-grade battery-powered instrumentation.
Availability
LT1112IN8#PBF is available at Aetrix Electronics and suitable for thermocouple amplification, battery-powered reference buffering, and two-op-amp instrumentation amplifier designs requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for LT1112IN8#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, emphasizing high-accuracy, low-power signal conditioning ICs for industrial, medical, and test equipment.
The LT1112 product line was designed specifically for picoamp-level sensor interfacing and matched-pair instrumentation applications - delivering precision performance in low-cost plastic packages without sacrificing specification guarantees.
FAQ
What is the maximum guaranteed input offset voltage for LT1112IN8#PBF over its full operating temperature range?
The LT1112IN8#PBF guarantees a maximum input offset voltage of 60 µV over its full operating temperature range of –40°C to +85°C. This value is confirmed in the Electrical Characteristics table for the "LT1112CN8/IN8" grade under the ● symbol denoting full-temperature-range specifications. At 25°C, typical VOS is 35 µV, with a maximum of 35 µV.
Does LT1112IN8#PBF support operation from ±1.0 V supplies, and what performance is guaranteed at that voltage?
Yes, LT1112IN8#PBF is explicitly guaranteed for operation from ±1.0 V supplies. At this minimum supply, the datasheet specifies guaranteed values for input offset voltage (40 µV max), supply current (320 µA max per amplifier), and power supply rejection ratio - enabling reliable use in ultra-low-power systems powered by two nearly depleted AA cells.
How does the matching performance of LT1112IN8#PBF compare to generic dual op amps in instrumentation amplifier designs?
LT1112IN8#PBF guarantees ΔVOS ≤ 60 µV, ΔIB⁺ ≤ 140 pA, and ∆CMRR ≥ 113 dB over temperature - parameters rarely specified for standard dual op amps. In a three-op-amp instrumentation amplifier, this matching reduces output offset by >90% compared to unmatched devices, eliminating manual trimming and improving production yield.
Is LT1112IN8#PBF pin-compatible with industry-standard dual op amp packages such as OP-200 or AD706?
Yes, LT1112IN8#PBF in the N8 (8-lead PDIP) package uses the industry-standard dual op amp pinout and is explicitly documented as a direct replacement for OP-200, OP-297, and AD706 duals - with improved price/performance, lower offset, and no phase reversal on input overdrive.
What is the typical 0.1 Hz to 10 Hz input voltage noise of LT1112IN8#PBF, and how does it impact thermocouple applications?
The LT1112IN8#PBF exhibits 0.3 µVP-P typical 0.1 Hz to 10 Hz input voltage noise - a critical spec for thermocouple amplification where signal amplitudes are in the µV range. This low noise floor enables resolution better than 0.1°C in Type K measurements without additional filtering, preserving signal integrity in low-frequency sensor interfaces.
LT1112IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1112IN8#PBF FAQ
1.How can I place an order for LT1112IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1112IN8#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 LT1112IN8#PBF reliable?
The price and inventory of LT1112IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1112IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1112IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1112IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1112IN8#PBF?
LT1112IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1112IN8#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 LT1112IN8#PBF?
For technical support, including LT1112IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1112IN8#PBF requirements.
6.How does Aetrix verify that LT1112IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1112IN8#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 LT1112IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1112IN8#PBF?
All LT1112IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1112IN8#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 LT1112IN8#PBF part is unused and in its original packaging.
Return procedure for LT1112IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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