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Analog Devices Inc. LT1112ACN8#PBF
- Part No.:
- LT1112ACN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1112ACN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,576
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Product details
Overview
LT1112ACN8#PBF from Analog Devices (formerly Linear Technology) is a dual precision operational amplifier optimized for low-power, picoamp-input 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 thermocouple amplifiers, bridge sensors, and battery-powered systems.
For engineers reviewing the LT1112ACN8#PBF datasheet, LT1112ACN8#PBF pinout, LT1112ACN8#PBF application, or LT1112ACN8#PBF equivalent, key selection criteria include guaranteed matching specifications (ΔVOS ≤ 100 µV), operation down to ±1.0 V supplies, and full performance across –40°C to +85°C - critical for instrumentation amplifier designs requiring channel-to-channel tracking.
Technical Context
The LT1112ACN8#PBF employs a proprietary super-beta bipolar input stage to achieve picoampere-level input bias current while maintaining low offset drift (0.5 µV/°C max). Its architecture supports matched dual-amplifier operation with guaranteed offset voltage match (ΔVOS) and common-mode rejection match (ΔCMRR), essential for two- and three-op-amp instrumentation topologies.
It operates across ±1.0 V to ±20 V supplies, with full electrical specifications guaranteed at ±1.0 V - enabling direct use with nearly depleted AA cells. Input protection diodes allow overvoltage tolerance up to one diode drop beyond rails, and output swing reaches within 1.0 V of each rail at 10 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 75 µV max - enables sub-100 µV system-level offset in precision sensor front-ends without trimming. |
| Input Bias Current | 250 pA max - preserves signal integrity in high-impedance sources like photodiodes and pH electrodes. |
| Supply Current per Amp | 400 µA max - allows dual-channel operation from two AA cells for >1 year in low-duty-cycle portable instruments. |
| Offset Voltage Match (ΔVOS) | 100 µV max - ensures <50 µV residual offset in three-op-amp instrumentation amplifiers using matched pair. |
| CMRR | 120 dB min - rejects common-mode noise from 50/60 Hz mains and EMI in industrial sensor interfaces. |
| Gain-Bandwidth Product | 750 kHz - supports stable closed-loop gains up to 100 at DC–1 kHz for anti-aliasing and sensor filtering. |
| Operating Temp Range | –40°C to +85°C - qualified for commercial and industrial environments without derating. |
Pinout & Package
LT1112ACN8#PBF is housed in an 8-lead PDIP (N8) package with standard dual op-amp pinout and 0.300-inch body width. Lead finish is lead-free (Pb-free) and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives feedback network or next-stage input; capable of ±13 V swing into 10 kΩ. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (800 GΩ common-mode RIN) for precision feedback paths. |
| 3 | +IN A | Non-inverting input of Amp A - matched to Pin 5 (+IN B) for differential sensing and instrumentation topologies. |
| 4 | V– | Negative supply rail - must be decoupled locally; supports operation down to –1.0 V. |
| 5 | +IN B | Non-inverting input of Amp B - electrically and thermally matched to Pin 3 for inter-amplifier tracking. |
| 6 | –IN B | Inverting input of Amp B - symmetric layout minimizes thermal gradients affecting ΔIB+ match. |
| 7 | OUT B | Amplifier B output - independent biasing enables simultaneous use in dual-channel signal chains. |
| 8 | V+ | Positive supply rail - accepts up to +20 V; internal protection limits absolute max to ±20 V. |
Key Features
| Feature | Design Value |
|---|---|
| Picoamp input bias current | Enables direct interfacing with >1 GΩ source impedances (e.g., piezoelectric sensors, ion-selective electrodes) without guard rings or T-networks. |
| Guaranteed matching specs | ΔVOS ≤ 100 µV and ΔCMRR ≥ 115 dB ensure predictable performance in 3-op-amp IA configurations without individual trimming. |
| ±1.0 V minimum supply | Supports single-supply or ultra-low-voltage dual-supply operation - ideal for energy-harvesting and coin-cell-powered devices. |
| Low 0.1–10 Hz noise | 0.3 µVP-P input-referred noise enables resolution of microvolt-level DC signals (e.g., thermocouples) without chopper stabilization. |
| Input overvoltage tolerance | Withstands inputs up to one diode drop beyond rails - prevents phase reversal during transients (unlike OP-297), improving system robustness. |
Applications
| Thermocouple Amplifier | Bridge Sensor Interface |
|---|---|
Use Scenario: Amplifying µV-level Seebeck voltages from Type-K thermocouples in HVAC controllers and industrial ovens. IC Role / Device Role / Timing Role: Dual op-amp configured as precision instrumentation amplifier (IA) with matched gain-setting resistors. Use Value: 75 µV max VOS and 0.5 µV/°C drift limit temperature measurement error to <0.5°C over 0–100°C range without calibration. | Use Scenario: Conditioning output from 350 Ω strain-gauge bridges in load cells and pressure transducers. IC Role / Device Role / Timing Role: First-stage IA with matched LT1112ACN8#PBF amplifiers providing high CMRR and low IB-induced offset. Use Value: 250 pA max IB avoids significant voltage drop across bridge's 350 Ω elements, preserving linearity and sensitivity. |
| Battery-Powered Data Logger | Low-Frequency Active Filter |
Use Scenario: Signal conditioning for multi-sensor environmental monitors powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Dual-channel front-end amplifier driving SAR ADC inputs; one amp used for sensor gain, one for reference buffering. Use Value: 400 µA per amplifier enables >2-year battery life at 1-sample-per-minute duty cycle with discharged cells down to ±1.3 V. | Use Scenario: 0.1–10 Hz anti-aliasing and noise-shaping filters in EEG and ECG front-ends. IC Role / Device Role / Timing Role: Dual op-amp implementing 2nd-order Sallen-Key topology with low 1/f noise and stable phase margin. Use Value: 0.3 µVP-P 0.1–10 Hz noise and 70° phase margin prevent oscillation and preserve waveform fidelity in sub-Hz biomedical signals. |
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 die, lower grade: 125 µV max VOS, same 250 pA IB, identical pinout and package. | Not specified for –40°C operation; only guaranteed 0°C to 70°C - unsuitable for cold-environment deployments. | Select LT1112ACN8#PBF when full –40°C to +85°C performance validation is required. |
| OP297GPZ | Higher VOS (100 µV max), higher IB (150 pA typ), no guaranteed matching specs, larger SO-8 footprint. | Lacks ΔVOS and ΔCMRR guarantees - requires external trimming for instrumentation-grade accuracy. | Choose LT1112ACN8#PBF for matched dual performance; OP297GPZ only where legacy compatibility outweighs matching needs. |
Compared with LT1112CN8#PBF, LT1112ACN8#PBF provides validated –40°C operation and tighter offset spec; versus OP297GPZ, it delivers superior matching, lower noise, and smaller PDIP footprint - making it optimal for cost-sensitive, high-accuracy dual-channel analog front-ends.
Availability
LT1112ACN8#PBF is available at Aetrix Electronics and suitable for thermocouple amplifiers, bridge sensor interfaces, and battery-powered data loggers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1112ACN8#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. Linear pioneered high-performance, low-power op amps for instrumentation and sensor signal chains.
The LT1112 product line was designed specifically for picoamp-input, low-drift instrumentation applications - targeting thermocouple, strain-gauge, and photo-current amplification where matching, noise, and supply flexibility are critical.
FAQ
What is the maximum input offset voltage specification for LT1112ACN8#PBF?
The LT1112ACN8#PBF has a maximum input offset voltage of 75 µV at 25°C, tested and guaranteed across the full –40°C to +85°C operating temperature range. This value applies to the "AC" grade and is tighter than the 125 µV max for the "C" grade (LT1112CN8#PBF), reflecting enhanced screening and characterization for precision applications.
Does LT1112ACN8#PBF support operation from ±1.0 V supplies?
Yes, LT1112ACN8#PBF is fully specified and guaranteed for operation with ±1.0 V supplies - including offset voltage, supply current, and PSRR. This enables direct use with two nearly depleted AA cells (down to ~±1.3 V open-circuit), and the 320 µA typical supply current per amplifier at ±1.0 V supports ultra-low-power portable instrumentation.
What is the guaranteed offset voltage match (ΔVOS) between the two amplifiers in LT1112ACN8#PBF?
The LT1112ACN8#PBF guarantees an offset voltage match (ΔVOS) of 100 µV maximum between its two amplifiers. This parameter - defined as the absolute difference between the input offset voltages of Amp A and Amp B - is critical for minimizing residual offset in three-op-amp instrumentation amplifier configurations and is tested per device.
Is LT1112ACN8#PBF pin-compatible with industry-standard dual op-amps?
Yes, LT1112ACN8#PBF uses the standard 8-pin PDIP dual op-amp pinout (OUT A, –IN A, +IN A, V–, +IN B, –IN B, OUT B, V+) and is pin-compatible with OP-200, AD706, and OP-297 in DIP packages. It directly replaces these parts with improved price/performance - particularly in offset, bias current, and matching specifications.
What package type and lead finish does LT1112ACN8#PBF use?
LT1112ACN8#PBF is supplied in an 8-lead plastic dual in-line package (PDIP), designated N8, with 0.300-inch body width. The lead finish is lead-free (Pb-free) and RoHS-compliant, meeting JEDEC J-STD-609 Category 2a requirements. No lead tinning or special handling is required for standard reflow or hand-soldering processes.
LT1112ACN8#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:
- 70 pA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 350µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1112ACN8#PBF FAQ
1.How can I place an order for LT1112ACN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1112ACN8#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 LT1112ACN8#PBF reliable?
The price and inventory of LT1112ACN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1112ACN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1112ACN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1112ACN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1112ACN8#PBF?
LT1112ACN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1112ACN8#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 LT1112ACN8#PBF?
For technical support, including LT1112ACN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1112ACN8#PBF requirements.
6.How does Aetrix verify that LT1112ACN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1112ACN8#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 LT1112ACN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1112ACN8#PBF?
All LT1112ACN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1112ACN8#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 LT1112ACN8#PBF part is unused and in its original packaging.
Return procedure for LT1112ACN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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