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Analog Devices Inc. LT1126ACN8#PBF
- Part No.:
- LT1126ACN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1126ACN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,588
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Product details
Overview
LT1126ACN8#PBF from Analog Devices (formerly Linear Technology) is a dual decompensated precision operational amplifier optimized for high-speed, low-noise signal conditioning in instrumentation and sensor interfaces. It delivers 65MHz gain-bandwidth product, 11V/µs slew rate, and 2.7nV/√Hz input voltage noise density at 1kHz - enabling accurate amplification of microvolt-level signals in strain gauge and accelerometer front-ends operating from ±15V supplies.
For engineers reviewing the LT1126ACN8#PBF datasheet, LT1126ACN8#PBF pinout, LT1126ACN8#PBF application, or LT1126ACN8#PBF equivalent, key selection criteria include guaranteed 100% tested noise performance, stability at gain ≥10, and compatibility with space-constrained through-hole designs using its 8-lead PDIP package.
Technical Context
The LT1126ACN8#PBF employs a proprietary bipolar input stage with matched transistor pairs to achieve low input offset voltage drift (0.3µV/°C typical) and high common-mode rejection (112dB min). Its decompensated architecture requires minimum closed-loop gain of 10 for stability, distinguishing it from unity-gain-stable predecessors like the LT1124.
All amplifiers undergo 100% production testing for slew rate, gain-bandwidth product, and 1kHz voltage noise - ensuring consistent high-frequency precision across the LT1126AC grade. The device maintains DC accuracy (70µV max VOS) while delivering wideband AC performance, making it suitable for active filters and direct-coupled audio gain stages where both noise floor and transient fidelity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 65MHz typical - enables stable operation with closed-loop gain ≥10 up to ~6.5MHz bandwidth |
| Slew Rate | 11V/µs typical - supports clean 20Vp-p output swing at 100kHz without slewing distortion |
| Input Voltage Noise Density | 2.7nV/√Hz at 1kHz - ensures <6µVRMS integrated noise over 480kHz bandwidth |
| Input Offset Voltage | 70µV maximum - provides microvolt-level DC accuracy for precision threshold detection |
| Common-Mode Rejection Ratio | 112dB minimum - rejects >300,000:1 of power supply and interference coupling |
| Supply Current per Amplifier | 3.1mA maximum - enables dual-amplifier operation within 6.2mA total at ±15V |
| Large-Signal Voltage Gain | 5 million minimum - guarantees <0.2µV/V gain error in high-precision closed-loop configurations |
Pinout & Package
N8 package: 8-lead plastic dual in-line package (PDIP), 0.300-inch width, through-hole mount, JEDEC MS-001 compliant. Pin 1 identified by notch or dot; leads tin-plated, RoHS-compliant (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A (–IN A) | Differential input node for first amplifier; accepts ±12.8V common-mode range |
| 2 | Non-Inverting Input A (+IN A) | Differential input node for first amplifier; matched bias current to –IN A |
| 3 | Output A (OUT A) | Class AB output stage capable of ±13.8V swing into 2kΩ load |
| 4 | Negative Supply (V–) | Connects to negative rail; shared return for both amplifiers |
| 5 | Positive Supply (V+) | Connects to positive rail; shared supply for both amplifiers |
| 6 | Non-Inverting Input B (+IN B) | Differential input node for second amplifier; electrically isolated from +IN A |
| 7 | Inverting Input B (–IN B) | Differential input node for second amplifier; matched to +IN B for CMRR |
| 8 | Output B (OUT B) | Independent output stage; channel separation >130dB at 10Hz prevents crosstalk |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested low-noise performance | Every unit verified for 2.7nV/√Hz noise at 1kHz and 65MHz GBW - eliminates binning risk in precision systems |
| Enhanced DC precision | 70µV max input offset voltage with 0.3µV/°C drift - reduces calibration burden in industrial temperature ranges |
| High open-loop gain | 5 million minimum large-signal voltage gain - ensures <0.02% gain error in 100× closed-loop configurations |
| Robust supply rejection | 116dB min PSRR - suppresses ±18V supply ripple to <100nV at output under dynamic load |
| Thermal stability | Matched input transistors minimize thermal gradient-induced offset drift between channels |
Applications
| Strain Gauge Amplifier | Microvolt Threshold Detector |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from metal foil strain gauges in load cells and pressure sensors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier core providing gain ≥1000 with sub-µV input-referred noise. Use Value: 2.7nV/√Hz noise density enables resolution of <10µV signals over 10kHz bandwidth, meeting ASTM E74 calibration requirements. |
Use Scenario: Detecting precise voltage thresholds in medical safety interlocks or battery protection circuits. IC Role / Device Role / Timing Role: High-gain comparator driver with ultra-low input offset to define exact trip points. Use Value: 70µV max VOS ensures trip point accuracy within ±0.07mV at 1V reference, eliminating manual trimming. |
| Active Low-Pass Filter | Tape Head Preamplifier |
Use Scenario: Implementing 480kHz 4th-order Butterworth filter in data acquisition front-ends. IC Role / Device Role / Timing Role: Dual-op-amp topology for cascaded biquad sections with minimal phase shift. Use Value: 65MHz GBW supports filter Q-factor >10 without peaking; 11V/µs slew rate preserves transient response up to 200kHz. |
Use Scenario: Boosting weak analog signals from magnetic tape playback heads before ADC sampling. IC Role / Device Role / Timing Role: Low-noise, wideband gain block compensating for head inductance roll-off. Use Value: 1/f corner at 2.3Hz and flat 2.7nV/√Hz noise enable full-audio-band SNR >95dB at 1kHz with 10kΩ source impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual decompensated op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1126CN8#PBF | Same pinout and architecture; wider 100µV max VOS and 45MHz GBW (vs 70µV/65MHz for LT1126ACN8#PBF) | Acceptable for cost-sensitive industrial controls where 0.1% gain error is tolerable | Select when budget constraints outweigh need for guaranteed microvolt DC accuracy and highest bandwidth |
| OPA211IDR | Unity-gain stable, lower 1.1nV/√Hz noise, but 45MHz GBW and higher 3.6mA supply current per amplifier | Better for DC-coupled sensor interfaces requiring gain <10; unsuitable for high-Q active filters needing decompensation | Choose only if system requires unity-gain stability or lower noise dominates over bandwidth and power |
Compared with LT1126CN8#PBF, the LT1126ACN8#PBF offers tighter DC specs and higher bandwidth for demanding instrumentation; versus OPA211IDR, it trades unity-gain flexibility for superior speed-power-noise balance in fixed-gain ≥10 topologies.
Availability
LT1126ACN8#PBF is available at Aetrix Electronics and suitable for precision instrumentation, sensor signal conditioning, and high-fidelity audio preamplification requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LT1126ACN8#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 full production and technical support for legacy Linear op amp families including the LT1126 series.
The LT1126 product line was designed specifically for high-speed, low-noise precision amplification in test equipment, medical instruments, and industrial measurement systems where decompensated performance outperforms unity-gain alternatives.
FAQ
What is the minimum stable closed-loop gain for LT1126ACN8#PBF?
The LT1126ACN8#PBF is decompensated and requires a minimum closed-loop gain of 10 for stability. This is specified in the datasheet's "Stability" section and confirmed by phase margin measurements showing adequate margin only at gains ≥10. Using LT1126ACN8#PBF at lower gains risks oscillation, especially with capacitive loads or long PCB traces.
Does LT1126ACN8#PBF support ±5V operation?
Yes, LT1126ACN8#PBF operates from ±4V to ±18V supply rails per the Absolute Maximum Ratings table. At ±5V, it maintains 112dB CMRR and 116dB PSRR, though slew rate reduces to ~7.5V/µs and output swing narrows to ±3.8V into 2kΩ. Full 65MHz GBW and 2.7nV/√Hz noise are characterized at ±15V but remain functional across the rated range.
Is LT1126ACN8#PBF pin-compatible with LT1124CN8#PBF?
No, LT1126ACN8#PBF is not pin-compatible with LT1124CN8#PBF. While both are dual op amps in 8-lead PDIP packages, their pinouts differ: LT1126ACN8#PBF uses V– on pin 4 and V+ on pin 5, whereas LT1124CN8#PBF places V+ on pin 8 and V– on pin 4. Swapping them will cause incorrect biasing and potential damage.
How is input voltage noise measured for LT1126ACN8#PBF?
LT1126ACN8#PBF input voltage noise is 100% production-tested at 1kHz with 2.7nV/√Hz typical and 4.2nV/√Hz maximum values. The 0.1Hz–10Hz flicker noise is separately specified as 70nVp-p, derived from 10Hz noise density measurements. All noise tests use standardized low-noise evaluation boards per Linear Technology's test methodology documented in the LT1126/LT1127 datasheet.
Can LT1126ACN8#PBF drive a 600Ω audio load?
LT1126ACN8#PBF can drive 600Ω loads but with reduced performance: output swing drops to ±10.5V (vs ±13.8V into 2kΩ), and THD+N rises above 0.01% above 10kHz due to increased output stage distortion. For professional audio, pairing LT1126ACN8#PBF with a dedicated line driver like the LT1010 is recommended to maintain <0.001% THD at full bandwidth.
LT1126ACN8#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:
- 11V/µs
- Gain Bandwidth Product:
- 65 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 7 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 2.6mA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1126ACN8#PBF FAQ
1.How can I place an order for LT1126ACN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1126ACN8#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 LT1126ACN8#PBF reliable?
The price and inventory of LT1126ACN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1126ACN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1126ACN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1126ACN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1126ACN8#PBF?
LT1126ACN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1126ACN8#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 LT1126ACN8#PBF?
For technical support, including LT1126ACN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1126ACN8#PBF requirements.
6.How does Aetrix verify that LT1126ACN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1126ACN8#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 LT1126ACN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1126ACN8#PBF?
All LT1126ACN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1126ACN8#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 LT1126ACN8#PBF part is unused and in its original packaging.
Return procedure for LT1126ACN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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