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Analog Devices Inc. LT1126CN8#PBF
- Part No.:
- LT1126CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1126CN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:112
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Product details
Overview
LT1126CN8#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, 2.7nV/√Hz input voltage noise at 1kHz, ±13.7V output swing (RL ≥ 2kΩ), and operates stably at gain ≥ 10. It is widely used in strain gauge amplifiers and active filters requiring microvolt-level accuracy and wide bandwidth.
For engineers reviewing the LT1126CN8#PBF datasheet, LT1126CN8#PBF pinout, LT1126CN8#PBF application, or LT1126CN8#PBF equivalent, key selection criteria include verified decompensated stability at G ≥ 10, 100% tested 1kHz voltage noise ≤ 4.2nV/√Hz, guaranteed offset voltage ≤ 100µV (C grade), and compatibility with standard 8-pin PDIP layout per N8 package drawing.
Technical Context
The LT1126CN8#PBF employs a proprietary bipolar input stage with matched transistor pairs to achieve low 1/f noise corner (2.3Hz) and high common-mode rejection (112dB min). Its decompensated architecture enables higher bandwidth and slew rate than unity-gain-stable counterparts like the LT1124, without sacrificing DC precision.
All amplifiers are 100% tested for slew rate, gain-bandwidth product, and 1kHz input voltage noise - ensuring consistent high-frequency performance across units. The device supports dual-supply operation up to ±22V and maintains specified AC/DC parameters over –40°C to +85°C (C grade).
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 |
| Slew Rate | 11V/µs typical - supports clean 10Vpp output at >1MHz without slewing distortion |
| Input Voltage Noise Density | 2.7nV/√Hz at 1kHz - critical for low-level sensor signal integrity in precision front-ends |
| Input Offset Voltage (Max) | 100µV - ensures ≤0.1% gain error in 100mV full-scale instrumentation amplifier designs |
| Supply Current per Amplifier | 3.1mA max - allows dual-channel operation within 6.2mA total, suitable for space-constrained PCBs |
| Common-Mode Rejection Ratio | 112dB minimum - rejects >300,000:1 of common-mode interference in differential sensing |
| Output Voltage Swing | ±13.7V into 2kΩ - delivers full dynamic range with ±15V supplies, minimizing headroom loss |
Pinout & Package
N8 package: 8-lead plastic DIP (0.300-inch width), through-hole mount, JEDEC MS-001 compliant. Pin 1 identified by notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A (–IN A) | Differential input node for Channel A; accepts bidirectional common-mode voltage up to ±12.4V |
| 2 | Non-Inverting Input A (+IN A) | Differential input node for Channel A; matched to Pin 1 for optimal CMRR |
| 3 | Output A (OUT A) | Class AB output stage capable of sourcing/sinking >20mA into 2kΩ load |
| 4 | Negative Supply (V–) | Return path for dual supply; must be decoupled locally with ≥0.1µF ceramic capacitor |
| 5 | Positive Supply (V+) | Power rail for both amplifiers; requires local 0.1µF ceramic + 10µF tantalum decoupling |
| 6 | Non-Inverting Input B (+IN B) | Differential input node for Channel B; electrically isolated but thermally coupled to Channel A |
| 7 | Inverting Input B (–IN B) | Differential input node for Channel B; matched to Pin 6 for inter-channel CMRR |
| 8 | Output B (OUT B) | Independent output stage; channel separation >130dB at 10Hz minimizes crosstalk in dual-path systems |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested low-noise performance | Every unit verified for 1kHz input voltage noise ≤ 4.2nV/√Hz - eliminates post-production screening |
| Guaranteed stability at gain ≥ 10 | Decompensated internal compensation enables 65MHz GBW without external compensation components |
| Matched amplifier pair | Typical input offset match ≤ 30µV between channels - reduces residual error in 3-op-amp instrumentation topologies |
| High-voltage gain | 5 million minimum open-loop gain - ensures <0.001% gain error in precision closed-loop configurations |
| Extended common-mode range | ±12.4V input voltage range with ±15V supplies - accommodates large-signal transducer outputs directly |
Applications
| Strain Gauge Amplifier | Active Filter Stage |
|---|---|
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: Dual-channel precision op amp configured as first-stage differential amplifier (G = 100) and second-stage gain/level-shift stage. Use Value: 2.7nV/√Hz noise density and 112dB CMRR preserve µε-level resolution; 65MHz GBW supports anti-aliasing filter design up to 100kHz. |
Use Scenario: Implementing 4th-order low-pass Butterworth filter for audio or data acquisition front-ends with cutoff at 20kHz. IC Role / Device Role / Timing Role: Two independent high-speed op amps used in cascaded Sallen-Key topology with precision RC networks. Use Value: 11V/µs slew rate prevents transient distortion on fast step inputs; 100% tested GBW ensures predictable filter roll-off and phase response. |
| Microvolt Threshold Detector | Tape Head Preamplifier |
Use Scenario: Detecting sub-100µV analog thresholds in biomedical EEG/ECG signal paths or industrial zero-crossing comparators. IC Role / Device Role / Timing Role: Precision op amp operating in comparator mode with hysteresis, leveraging low VOS and drift for stable trip points. Use Value: 100µV max offset and 0.3µV/°C drift ensure thermal stability of detection threshold; 112dB PSRR rejects supply ripple-induced false triggers. |
Use Scenario: Boosting weak, high-impedance signals from magnetic tape playback heads before ADC sampling. IC Role / Device Role / Timing Role: First-stage low-noise preamplifier (G = 50) followed by equalization network driving 600Ω line interface. Use Value: 2.7nV/√Hz noise density dominates system noise floor below 10kHz; wide 65MHz GBW preserves high-frequency tape harmonics. |
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 |
|---|---|---|---|
| LT1126CS8#PBF | Same die, SO-8 package (S8); 190°C/W θJA vs 130°C/W for N8; identical electrical specs | Better thermal performance in surface-mount layouts; requires rework for through-hole boards | Select when board space is constrained and reflow assembly is available |
| OPA211IDR | FET-input (not bipolar); 1.1nV/√Hz noise; 45MHz GBW; unity-gain stable; higher supply current (3.6mA) | Superior noise at <100Hz; lower bandwidth; no gain restriction; unsuitable for G ≥ 10 fixed-gain designs | Choose only if unity-gain stability or ultra-low 1/f noise is mandatory and bandwidth ≤ 45MHz suffices |
Compared with LT1126CS8#PBF, LT1126CN8#PBF offers identical precision and speed in a through-hole package ideal for prototyping and legacy systems; versus OPA211IDR, it trades slightly higher 1kHz noise for guaranteed decompensated stability at gain ≥ 10 and superior DC accuracy in high-gain sensor interfaces.
Availability
LT1126CN8#PBF is available at Aetrix Electronics and suitable for strain gauge amplifiers, active filters, microvolt threshold detectors, and tape head preamplifiers requiring stable component supply across industrial, test & measurement, and medical electronics programs.
Supply support for LT1126CN8#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 technical and manufacturing continuity for legacy Linear op amp families including the LT1126 series.
The LT1126 product line was designed specifically for high-precision, high-speed instrumentation applications where simultaneous low noise, high bandwidth, and microvolt-level DC accuracy are non-negotiable - especially in dual-amplifier configurations like 3-op-amp in-amps.
FAQ
What is the minimum stable gain for LT1126CN8#PBF?
The LT1126CN8#PBF is decompensated and requires a minimum closed-loop gain of 10 for unconditional stability. Operating at gains below 10 may cause peaking or oscillation due to insufficient phase margin. This is explicitly specified in the datasheet's "Stability" section and confirmed by the gain-vs-phase plot showing <45° phase margin below G = 10. Always verify stability with actual layout parasitics using SPICE simulation or bench testing for LT1126CN8#PBF.
Does LT1126CN8#PBF support single-supply operation?
LT1126CN8#PBF is specified for dual-supply operation (±2.5V to ±22V) and does not support true single-supply operation down to ground. Its input common-mode range extends to within 1.5V of each rail (e.g., –13.5V to +13.5V with ±15V supplies), but the input stage cannot handle inputs at V–. For single-rail applications, consider rail-to-rail input/output alternatives like LT1678 or OPA2188 - LT1126CN8#PBF requires dual supplies for proper biasing and linear operation.
What is the maximum capacitive load LT1126CN8#PBF can drive?
LT1126CN8#PBF can safely drive up to 100pF without external compensation, based on stability analysis in the datasheet's "Capacitive Load Driving" section. For loads >100pF (e.g., long cables or ADC input capacitance), a small isolation resistor (10–50Ω) in series with the output is required to maintain phase margin. This limitation applies identically to both channels of LT1126CN8#PBF and is independent of gain configuration.
Is LT1126CN8#PBF RoHS compliant and lead-free?
Yes, LT1126CN8#PBF is RoHS compliant and features lead-free termination (Pb-free, SnAgCu solder finish) per Analog Devices' standard packaging. The "#PBF" suffix explicitly denotes lead-free packaging, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. Full compliance documentation, including material declarations and test reports, is available for LT1126CN8#PBF upon request from Aetrix Electronics.
How does LT1126CN8#PBF compare to LT1124 in terms of bandwidth and noise?
LT1126CN8#PBF offers 65MHz gain-bandwidth product and 2.7nV/√Hz input voltage noise at 1kHz - significantly higher bandwidth and slightly lower noise than LT1124 (45MHz GBW, 3.0nV/√Hz). However, LT1124 is unity-gain stable while LT1126CN8#PBF requires gain ≥ 10. Both share identical DC specs (offset, drift, CMRR), making LT1126CN8#PBF the preferred choice when high closed-loop gain and wide bandwidth are needed without compromising precision.
LT1126CN8#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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1126CN8#PBF FAQ
1.How can I place an order for LT1126CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1126CN8#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 LT1126CN8#PBF reliable?
The price and inventory of LT1126CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1126CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1126CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1126CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1126CN8#PBF?
LT1126CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1126CN8#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 LT1126CN8#PBF?
For technical support, including LT1126CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1126CN8#PBF requirements.
6.How does Aetrix verify that LT1126CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1126CN8#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 LT1126CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1126CN8#PBF?
All LT1126CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1126CN8#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 LT1126CN8#PBF part is unused and in its original packaging.
Return procedure for LT1126CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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