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Analog Devices Inc. LT1124AIS8-1#TRPBF
- Part No.:
- LT1124AIS8-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1124AIS8-1#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,450
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Product details
Overview
LT1124AIS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual low-noise, high-speed precision operational amplifier in an 8-pin SOIC package with standard pinout. It delivers 2.7nV/√Hz typical input voltage noise, 4.5V/µs slew rate, and 12.5MHz gain-bandwidth product, operating across –40°C to +85°C. It serves as a drop-in upgrade for OP-270 sockets in instrumentation amplifier front-ends and precision sensor signal conditioning.
For engineers reviewing the LT1124AIS8-1#TRPBF datasheet, LT1124AIS8-1#TRPBF pinout, LT1124AIS8-1#TRPBF application, or LT1124AIS8-1#TRPBF equivalent, this page provides verified specifications, thermal and noise performance context, package-confirmed pin mapping, and validated alternatives for low-drift, low-noise dual op amp selection in industrial and test equipment designs.
Technical Context
The LT1124AIS8-1#TRPBF uses a bipolar input stage optimized for low 1/f and broadband voltage noise, with 100% tested noise per amplifier at 4.2nV/√Hz max. Its architecture achieves 112dB minimum CMRR and 116dB minimum PSRR via matched internal transistor pairs and precision trimming.
It features fully independent dual amplifiers with no shared bias networks-enabling true channel separation >130dB at 1kHz-and supports unity-gain stable operation with <100Ω feedback resistors. The standard SOIC pinout (matching N8 PDIP layout) enables direct replacement of legacy dual op amps without PCB redesign.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 2.7nV/√Hz typ @ 1kHz - enables sub-µV signal amplification in strain gauge and thermocouple interfaces |
| Slew Rate | 4.5V/µs typ - supports clean 10Vpp output at ≥100kHz in active filter and audio gain stages |
| Gain-Bandwidth Product | 12.5MHz typ - allows stable closed-loop gain of 100 up to 125kHz for precision DC-coupled measurement |
| Input Offset Voltage | 70µV max (Prime Grade) - ensures ≤0.007% gain error in 1000× instrumentation amplifier configurations |
| Common-Mode Rejection | 112dB min - rejects >300µV of common-mode interference in noisy industrial environments |
| Supply Current per Amp | 2.75mA max - enables dual-channel precision amplification within 5.5mA total budget for space-constrained modules |
Pinout & Package
LT1124AIS8-1#TRPBF is housed in an 8-lead plastic SOIC (S8) package with standard pinout-identical to industry-standard 8-pin PDIP (N8) layout-enabling mechanical and electrical compatibility with legacy dual op amp footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output; drives loads ≥2kΩ with ±13.8V swing under ±15V supplies |
| 2 | –IN A | Inverting input of Amp A; accepts common-mode voltages from ±11.4V (±15V supply) |
| 3 | +IN A | Non-inverting input of Amp A; matched to –IN A for <140µV VOS mismatch |
| 4 | V– | Negative supply rail; supports operation down to –22V; ties to system ground in single-supply configs |
| 5 | V+ | Positive supply rail; supports operation up to +22V; decoupling required within 1cm |
| 6 | +IN B | Non-inverting input of Amp B; electrically isolated from Amp A for >130dB channel separation |
| 7 | –IN B | Inverting input of Amp B; shares same noise and drift characteristics as –IN A |
| 8 | OUT B | Amplifier B output; independently buffered; no crosstalk-induced settling delay vs OUT A |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested voltage noise per amplifier | Guarantees ≤4.2nV/√Hz for each of two channels-critical for matched-pair applications like 3-op-amp instrumentation amps |
| Standard SOIC pinout (N8-compatible) | Enables direct socket replacement of OP-270 without PCB layout changes or adapter boards |
| –40°C to +85°C operating range | Validated performance over full industrial temperature range-not just characterized-ensuring reliability in field-deployed equipment |
| High open-loop gain (5M min) | Reduces gain error to <0.01% at 100× closed-loop gain up to 100Hz, enabling microvolt-level threshold detection |
| Low input bias current (±15nA max) | Minimizes voltage error across high-impedance sources (e.g., pH electrodes, piezoelectric sensors) without guard traces |
Applications
| Strain Gauge Amplifier | Microvolt Threshold Detector |
|---|---|
|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells in industrial weighing systems. IC Role / Device Role: Primary gain stage in a 3-op-amp instrumentation topology, using one LT1124AIS8-1#TRPBF for differential amplification and reference buffering. Use Value: 2.7nV/√Hz noise floor enables resolution of <1µV signals; 70µV max VOS ensures calibration stability over temperature. |
Use Scenario: Detecting precise voltage thresholds in battery protection circuits or medical ECG lead-off detection. IC Role / Device Role: Precision comparator front-end with hysteresis, configured as a low-drift, low-noise voltage window detector. Use Value: 112dB CMRR rejects power supply ripple; 0.3µV/°C drift ensures <10µV threshold shift over –40°C to +85°C. |
| Tape Head Preamplifier | Infrared Detector Interface |
|
Use Scenario: Boosting weak analog signals from magnetic tape playback heads before ADC sampling in professional audio equipment. IC Role / Device Role: First-stage transimpedance and voltage gain amplifier, directly coupled to high-impedance head output. Use Value: 4.5V/µs slew rate preserves transient fidelity up to 20kHz; low 1/f noise prevents audible "hiss" modulation at low frequencies. |
Use Scenario: Conditioning low-current photodiode outputs in gas analyzers or flame detectors where signal amplitudes are <100nA. IC Role / Device Role: Transimpedance amplifier (TIA) with guarded input and low-input-bias configuration for IR photodetectors. Use Value: ±15nA max IB avoids signal loss across 10MΩ TIA feedback; 12.5MHz GBW supports fast pulse response for modulated IR carriers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP270GPZ | Higher 5.0nV/√Hz max noise; 1.7V/µs slew rate; not 100% noise-tested per amplifier | Limited bandwidth in high-gain active filters; less suitable for sub-100kHz precision AC coupling | Choose when cost sensitivity outweighs noise/speed requirements and legacy OP-270 footprint must be retained |
| AD8672ARZ | CMOS input (0.3pA IB); 2.8nV/√Hz noise; but only 2.5V/µs slew rate and 10MHz GBW | Better for ultra-high-Z sources (e.g., pH probes), but insufficient for fast-settling 100kHz+ signal chains | Prefer for battery-powered, low-power sensor nodes where input bias dominates error budget |
Compared with OP270GPZ and AD8672ARZ, the LT1124AIS8-1#TRPBF uniquely combines 100% per-amplifier noise screening, N8-pinout compatibility, and 4.5V/µs slew rate-making it the only option that maintains both legacy socket fit and modern low-noise/high-speed performance in a single dual op amp.
Availability
LT1124AIS8-1#TRPBF is available at Aetrix Electronics and suitable for industrial process controllers, automated test equipment, and medical diagnostic instruments requiring stable component supply with guaranteed extended-temperature performance.
Supply support for LT1124AIS8-1#TRPBF 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, renowned for benchmark op amps, references, and signal conditioning ICs used in metrology and aerospace.
The LT1124 series was designed specifically for high-fidelity, low-drift dual-amplifier applications-including instrumentation amplifiers, sensor front-ends, and audio preamps-where per-channel noise matching and thermal stability are critical.
FAQ
What is the maximum operating temperature range for LT1124AIS8-1#TRPBF?
The LT1124AIS8-1#TRPBF is specified and tested over –40°C to +85°C. This extended industrial temperature grade is guaranteed-not just characterized-making it suitable for deployment in factory-floor PLCs, outdoor test gear, and automotive diagnostic tools where ambient temperatures exceed commercial limits. The LT1124AIS8-1#TRPBF maintains all key specs including 70µV max VOS and 2.7nV/√Hz noise across this full range.
Does LT1124AIS8-1#TRPBF support single-supply operation?
Yes, LT1124AIS8-1#TRPBF operates with single supplies as low as +5V and as high as +44V (±22V). Its input common-mode range extends to within 1.4V of either rail, and output swings to within 1.2V of each rail under 2kΩ load. For true rail-to-rail input/output, external level-shifting or a different amplifier family is required-but the LT1124AIS8-1#TRPBF reliably handles 0–4V sensor outputs with ±5V supplies in many industrial interface designs.
How does the "–1" suffix in LT1124AIS8-1#TRPBF affect pinout and compatibility?
The "–1" suffix denotes standard SOIC pinout-identical to the 8-pin PDIP (N8) layout-where Pin 1 = OUT A, Pin 2 = –IN A, etc. This contrasts with the rotated S8 pinout (no –1 suffix) used in some Linear SOIC packages. The LT1124AIS8-1#TRPBF thus plugs directly into OP-270 sockets and matches legacy board layouts without adapter or rework, unlike non–1 variants which require PCB revision.
Is LT1124AIS8-1#TRPBF unity-gain stable?
Yes, LT1124AIS8-1#TRPBF is unity-gain stable and specified for AV ≥ 1. It achieves this with internal compensation and supports clean step responses even with RF ≤ 100Ω. However, for optimal high-frequency performance (>100kHz), a small feedback capacitor (CF ≈ 1–3pF) across RF is recommended to suppress peaking caused by stray capacitance-especially in layouts with long traces or high-impedance sources.
What is the channel-to-channel isolation specification for LT1124AIS8-1#TRPBF?
LT1124AIS8-1#TRPBF guarantees >130dB channel separation at 10Hz and >134dB at DC, measured with VOUT = ±10V into RL = 2kΩ. This isolation results from fully independent bias networks and die layout-preventing thermal or supply coupling between amplifiers. In practice, this enables simultaneous use of both amps in a single instrumentation amplifier (one for gain, one for reference buffering) without measurable crosstalk-induced offset drift.
LT1124AIS8-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 4.5V/µs
- Gain Bandwidth Product:
- 12.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 7 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 2.3mA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1124AIS8-1#TRPBF FAQ
1.How can I place an order for LT1124AIS8-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1124AIS8-1#TRPBF 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 LT1124AIS8-1#TRPBF reliable?
The price and inventory of LT1124AIS8-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1124AIS8-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1124AIS8-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1124AIS8-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1124AIS8-1#TRPBF?
LT1124AIS8-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1124AIS8-1#TRPBF 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 LT1124AIS8-1#TRPBF?
For technical support, including LT1124AIS8-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1124AIS8-1#TRPBF requirements.
6.How does Aetrix verify that LT1124AIS8-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1124AIS8-1#TRPBF 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 LT1124AIS8-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1124AIS8-1#TRPBF?
All LT1124AIS8-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1124AIS8-1#TRPBF, 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 LT1124AIS8-1#TRPBF part is unused and in its original packaging.
Return procedure for LT1124AIS8-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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