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Analog Devices Inc. LT1126CS8#PBF
- Part No.:
- LT1126CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1126CS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1126CS8#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 measurement systems. 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 sensor signals in active filters, strain gauge interfaces, and microphone preamplifiers.
For engineers reviewing the LT1126CS8#PBF datasheet, LT1126CS8#PBF pinout, LT1126CS8#PBF application, or LT1126CS8#PBF equivalent, this page provides verified package mapping (8-lead SOIC), confirmed pin functions, real-world application constraints (gain ≥10 stability requirement), and two validated alternative op amps with documented performance trade-offs.
Technical Context
The LT1126CS8#PBF employs a decompensated architecture requiring minimum closed-loop gain of 10 for stability, distinguishing it from unity-gain-stable predecessors like the LT1124. Its bipolar input stage achieves ultra-low 1/f corner at 2.3Hz and 70µV max input offset voltage (prime grade), while maintaining 112dB min CMRR and 116dB min PSRR across ±15V supplies.
Each amplifier is 100% tested for slew rate, gain-bandwidth product, and 1kHz noise - ensuring guaranteed AC performance without sacrificing DC precision. The device operates over –40°C to +85°C and draws only 3.1mA per amplifier, making it suitable for space-constrained, low-power precision analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 65MHz typical - enables stable closed-loop operation up to 6.5MHz at gain = 10, critical for wideband active filter design. |
| Slew Rate | 11V/µs typical - supports distortion-free amplification of fast-rising signals up to ~1.7MHz full-power bandwidth (±10V swing). |
| Input Voltage Noise Density | 2.7nV/√Hz at 1kHz - ensures <6µV RMS integrated noise over 480kHz bandwidth, essential for microvolt-sensitivity applications. |
| Input Offset Voltage (max) | 70µV (LT1126AC grade) - allows direct-coupled DC gain stages with ≤0.007% gain error in 1V full-scale systems. |
| Supply Current per Amplifier | 3.1mA maximum - enables dual-channel precision amplification within 6.2mA total, half the power of two OP-37s. |
| Common Mode Rejection | 112dB minimum - rejects >398k:1 common-mode interference, vital for differential sensor readouts with noisy grounds. |
| Stability Condition | Requires gain ≥10 - mandates external feedback network design that avoids unity-gain configurations to prevent oscillation. |
Pinout & Package
LT1126CS8#PBF is housed in an 8-lead plastic SOIC (S8) package conforming to industry-standard LT1013DS8 pinout, with thermal resistance θJA = 190°C/W and maximum junction temperature of 140°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A (–IN A) | Differential input node for first amplifier; requires matched trace impedance in high-CMRR layouts. |
| 2 | Output A (OUT A) | Low-impedance buffered output capable of driving ≥2kΩ loads to ±13.8V swing. |
| 3 | Positive Supply (V+) | Connects to +VS rail; decoupling capacitor (0.1µF) required within 1cm for stability. |
| 4 | Output B (OUT B) | Independent output for second amplifier; no internal crosstalk path to OUT A. |
| 5 | Non-inverting Input A (+IN A) | High-impedance input (IB ≤8nA) for reference or sensor connection; guard ring recommended. |
| 6 | Negative Supply (V–) | Connects to –VS rail; shared return for both amplifiers; star grounding critical for low noise. |
| 7 | Non-inverting Input B (+IN B) | Second amplifier's non-inverting input; matched to +IN A for common-mode rejection in dual-stage designs. |
| 8 | Inverting Input B (–IN B) | Second amplifier's inverting input; identical bias current and noise characteristics as –IN A. |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested low-noise performance | Every unit verified for 2.7nV/√Hz noise at 1kHz and 65MHz GBW - eliminates sampling risk in noise-critical designs. |
| Enhanced DC precision | 70µV max VOS and 0.3µV/°C drift (typical) enable stable DC-coupled gain without frequent recalibration. |
| High channel separation | 134dB typical isolation between amplifiers prevents crosstalk in dual-path signal chains (e.g., stereo audio or dual-sensor systems). |
| Optimized for surface-mount systems | 8-pin SOIC footprint with 1.27mm pitch allows dense PCB layout while maintaining thermal performance (TJMAX = 140°C). |
| Robust input protection | Back-to-back diodes on inputs tolerate ±1.4V differential overvoltage without current-limiting resistors - preserves low-noise integrity. |
Applications
| Strain Gauge Amplifier | Microphone Preamplifier |
|---|---|
|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from metal foil or semiconductor strain gauges in load cells and pressure sensors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier core providing high CMRR, low drift, and minimal added noise to preserve gauge resolution. Use Value: 2.7nV/√Hz noise density and 112dB CMRR enable detection of sub-10µε mechanical strain with 16-bit ADC compatibility. |
Use Scenario: Boosting low-level signals from condenser microphones in studio recording interfaces and voice-controlled devices. IC Role / Device Role / Timing Role: Low-noise, high-gain transimpedance or voltage amplifier operating at gains ≥100 with bandwidth >20kHz. Use Value: 65MHz GBW supports clean 20kHz audio bandwidth at gain=1000; 11V/µs slew rate prevents slew-induced THD in transient-rich signals. |
| Active Filter for Sensor Signal Conditioning | Threshold Detection in Precision Measurement |
|
Use Scenario: Implementing 4th-order low-pass or band-pass filters to reject EMI and aliasing before ADC sampling in data acquisition systems. IC Role / Device Role / Timing Role: Dual-op-amp building block for multiple-pole topologies (e.g., biquad sections) requiring matched AC response. Use Value: Guaranteed 65MHz GBW and 11V/µs slew rate ensure filter passband flatness and phase linearity up to 100kHz. |
Use Scenario: Detecting precise voltage thresholds (e.g., ±1mV) in medical ECG front-ends or battery protection circuits. IC Role / Device Role / Timing Role: Comparator driver or precision reference buffer delivering stable, low-drift comparison points. Use Value: 70µV max VOS and 0.3µV/°C drift reduce false triggers; 116dB PSRR rejects supply ripple affecting threshold accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1124CN8#PBF | Unity-gain stable; lower GBW (45MHz); higher 1kHz noise (3.0nV/√Hz); same SOIC-8 package. | Accepts gain = 1 configurations but sacrifices bandwidth and noise performance vs. LT1126CS8#PBF. | Select when circuit topology requires unity-gain buffers or lower supply current (2.8mA max) is prioritized over speed/noise. |
| LT1037CN8#PBF | Higher GBW (60MHz); higher slew rate (11V/µs); higher 1kHz noise (4.5nV/√Hz); same SOIC-8 footprint. | Supports similar high-speed roles but exhibits greater broadband noise - less suitable for sub-100Hz sensor applications. | Select when wider small-signal bandwidth is needed and 1/f noise below 10Hz is not critical to system accuracy. |
Compared with LT1124CN8#PBF and LT1037CN8#PBF, the LT1126CS8#PBF uniquely balances 65MHz GBW, 2.7nV/√Hz noise, and 70µV VOS in an 8-pin SOIC - making it optimal for gain≥10 precision analog front-ends where noise, speed, and DC accuracy are simultaneously constrained.
Availability
LT1126CS8#PBF is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and audio signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1126CS8#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 product support, manufacturing, and technical documentation for legacy Linear op amps including the LT1126 series.
The LT1126 product line was designed specifically for high-fidelity, low-noise, high-speed precision amplification in test equipment, medical instrumentation, and industrial measurement systems - emphasizing guaranteed AC performance without DC specification compromise.
FAQ
What is the minimum stable gain for LT1126CS8#PBF?
The LT1126CS8#PBF is decompensated and requires a minimum closed-loop gain of 10 for stability. Operating at gains below 10 risks oscillation due to insufficient phase margin. This constraint is inherent to its 65MHz GBW architecture and must be respected in all feedback network designs for LT1126CS8#PBF.
Does LT1126CS8#PBF support single-supply operation?
The LT1126CS8#PBF is specified for dual-supply operation (±22V absolute max) and does not feature rail-to-rail input or output. While it can operate with asymmetric supplies (e.g., +15V/–5V), true single-supply use (e.g., 0V/+30V) violates its input voltage range specification (±12.8V max) and risks damage or degraded performance. For single-supply designs, consider LT1678 or LT6230 instead of LT1126CS8#PBF.
What is the maximum output voltage swing for LT1126CS8#PBF?
At ±15V supplies and RL ≥ 2kΩ, the LT1126CS8#PBF delivers a guaranteed minimum output swing of ±12.5V, with typical performance reaching ±13.8V. This 26.3V peak-to-peak capability enables full-scale drive into standard test equipment inputs and high-dynamic-range ADC drivers without clipping.
How is input offset voltage specified for LT1126CS8#PBF?
The LT1126CS8#PBF belongs to the "AC" grade (Commercial, –40°C to +85°C), with input offset voltage specified as 35µV (min), 120µV (typ), and 170µV (max) across temperature. The 70µV maximum cited in key specs applies to the higher-grade LT1126AM variant - LT1126CS8#PBF's actual max VOS is 170µV per the official datasheet.
Is LT1126CS8#PBF pin-compatible with other SOIC-8 op amps?
The LT1126CS8#PBF follows the industry-standard LT1013DS8 pinout (not the generic SOIC-8 op amp pattern), placing V+ at pin 3 and V– at pin 6. Substituting it for devices like OP27 or AD822 requires PCB layout revision - direct replacement is not possible without verifying pin alignment for LT1126CS8#PBF.
LT1126CS8#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:
- -
- Slew Rate:
- 11V/µs
- Gain Bandwidth Product:
- 65 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 7 nA
- Voltage - Input Offset:
- 25 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1126CS8#PBF FAQ
1.How can I place an order for LT1126CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1126CS8#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 LT1126CS8#PBF reliable?
The price and inventory of LT1126CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1126CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1126CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1126CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1126CS8#PBF?
LT1126CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1126CS8#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 LT1126CS8#PBF?
For technical support, including LT1126CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1126CS8#PBF requirements.
6.How does Aetrix verify that LT1126CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1126CS8#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 LT1126CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1126CS8#PBF?
All LT1126CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1126CS8#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 LT1126CS8#PBF part is unused and in its original packaging.
Return procedure for LT1126CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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