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Analog Devices Inc. LT1128CS8#TRPBF
- Part No.:
- LT1128CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1128CS8#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,409
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Product details
Overview
LT1128CS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision, ultralow-noise, unity-gain-stable operational amplifier in an 8-lead SOIC package. It delivers 0.85nV/√Hz voltage noise density at 1kHz, 13MHz minimum gain-bandwidth product, 5V/µs minimum slew rate, and 40µV maximum input offset voltage - optimized for high-fidelity audio preamplification, photodiode transimpedance amplification, and low-noise sensor signal conditioning.
For engineers reviewing the LT1128CS8#TRPBF datasheet, LT1128CS8#TRPBF pinout, LT1128CS8#TRPBF application, or LT1128CS8#TRPBF equivalent, key selection criteria include verified 10Hz–1kHz voltage noise performance, guaranteed unity-gain stability, SOIC-8 thermal and layout compatibility, and validated operation with ±15V supplies across 0°C to 70°C.
Technical Context
The LT1128CS8#TRPBF employs a high-bias-current bipolar input stage (≈1mA collector current per side) to achieve sub-1nV/√Hz voltage noise, while maintaining only 25nA typical input bias current via precision current cancellation circuitry. Its 1/f voltage noise corner is 14Hz, and its current noise density is 1.0pA/√Hz at 1kHz - making it optimal for source impedances below 400Ω.
This op amp is internally compensated for stable operation at unity gain (AV = +1), unlike the LT1028 (gain-of–1 stable). It features matched input resistance (300MΩ common-mode, 20kΩ differential), 126dB typical CMRR, and 133dB typical PSRR - enabling high-accuracy DC-coupled amplification in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.85nV/√Hz typ @ 1kHz - enables detection of microvolt-level signals in low-Z transducer interfaces |
| Gain-Bandwidth Product | 13MHz min - supports stable closed-loop bandwidth up to ~12.5MHz at AV = +1 |
| Slew Rate | 5V/µs min - preserves fidelity of fast-rising audio or pulse signals without slewing distortion |
| Input Offset Voltage | 40µV max - ensures ≤0.4mV output error in unity-gain buffer configurations with ±15V rails |
| Input Bias Current | ±30nA max @ 25°C - minimizes voltage drop across high-value feedback resistors in TIA designs |
| Supply Current | 10.5mA max - balances ultralow noise with moderate power consumption for continuous-duty instrumentation |
| Operating Temp Range | 0°C to 70°C - qualified for commercial-grade embedded systems and benchtop test equipment |
Pinout & Package
LT1128CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with JEDEC MS-012AC footprint, 1.27mm pitch, and 150°C maximum junction temperature. Thermal resistance θJA = 140°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN) | Inverting Input | Differential input node; high-impedance, low-noise bipolar input stage |
| 2 (+IN) | Non-Inverting Input | Differential input node; matched to Pin 1 for CMRR optimization |
| 3 (V–) | Negative Supply | Connects to –15V rail; supports dual-supply operation down to –22V absolute max |
| 4 (VOS TRIM) | Offset Null Terminal | Allows external 1kΩ potentiometer for fine VOS adjustment without degrading drift |
| 5 (OVER-COMP) | Over-Compensation Node | Optional capacitor connection point to reduce bandwidth/slew rate for improved stability |
| 6 (V+) | Positive Supply | Connects to +15V rail; supports dual-supply operation up to +22V absolute max |
| 7 (OUT) | Output | Class-A output stage capable of ±12.7V swing into 2kΩ load |
| 8 (VOS TRIM) | Offset Null Terminal | Second terminal of nulling network; used with Pin 4 for symmetric trimming |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 1kHz voltage noise | 0.85nV/√Hz typ - outperforms legacy precision op amps by >3×, critical for sub-microvolt signal recovery |
| Guaranteed unity-gain stability | Stable at AV = +1 without external compensation - simplifies buffer and follower designs |
| 100% tested voltage/current noise | 1kHz en and In verified on every unit - eliminates sampling risk in noise-sensitive production systems |
| Low 1/f noise corner | 14Hz typical - ensures minimal low-frequency drift in DC-coupled sensor front-ends |
| High PSRR & CMRR | 133dB PSRR / 126dB CMRR typ - rejects supply ripple and common-mode interference in mixed-signal PCBs |
Applications
| Audio Preamp Stage | Photodiode TIA |
|---|---|
Use Scenario: High-resolution microphone or phono cartridge signal amplification in studio-grade audio interfaces. IC Role / Device Role: First-stage low-noise voltage amplifier with gain = +1 to +100, DC-coupled to preserve bass response. Use Value: 0.85nV/√Hz noise ensures ≥120dB dynamic range with 100Ω source impedance - no audible hiss floor. | Use Scenario: Converting nanoamp-level photocurrent from silicon PIN diodes (e.g., SFH213) into measurable voltage. IC Role / Device Role: Transimpedance amplifier with 1MΩ feedback resistor and unity-gain configuration. Use Value: 35nVP-P (0.1–10Hz) and 0.85nV/√Hz noise enable detection of <10nA photocurrents with sub-pA resolution. |
| Accelerometer Signal Chain | Bridge Amplifier (350Ω) |
Use Scenario: Conditioning low-level mV outputs from MEMS accelerometers in vibration monitoring systems. IC Role / Device Role: Low-drift, low-noise instrumentation amplifier front-end with selectable gain and filtering. Use Value: 0.1µV/°C max drift and 40µV max VOS prevent thermal-induced baseline shift during 8-hour industrial runs. | Use Scenario: Amplifying differential output from strain-gauge Wheatstone bridges in load cells and pressure sensors. IC Role / Device Role: Precision difference amplifier with matched inputs and high CMRR to reject bridge common-mode voltage. Use Value: 126dB CMRR suppresses >99.999% of 10V bridge excitation ripple, enabling 24-bit ADC utilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1028CS8#TRPBF | Gain-of–1 stable; 75MHz GBW; 11V/µs SR; higher noise floor above 10kHz | Better for high-speed inverting gain stages (>10MHz), less optimal for unity-gain buffers | Select when inverting configuration and wide bandwidth outweigh unity-gain simplicity |
| OPA1612AIDR | 1.1nV/√Hz @ 1kHz; rail-to-rail output; 40MHz GBW; lower IB (1.5pA) | Superior for single-supply, low-voltage, or high-Z sensor interfaces; not unity-gain stable without compensation | Prefer for battery-powered audio or high-impedance pH/ion sensors where supply headroom is constrained |
Compared with LT1028CS8#TRPBF and OPA1612AIDR, the LT1128CS8#TRPBF uniquely combines guaranteed unity-gain stability, sub-0.9nV/√Hz noise, and robust ±15V operation - making it the optimal choice for fixed-gain, dual-supply, low-noise instrumentation where layout simplicity and DC accuracy are prioritized over rail-to-rail swing or femtoamp bias current.
Availability
LT1128CS8#TRPBF is available at Aetrix Electronics and suitable for high-fidelity audio interfaces, photodiode-based optical sensors, and industrial bridge transducer signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for LT1128CS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1128CS8#TRPBF belongs to ADI's legacy Linear Technology precision op amp portfolio, engineered specifically for applications demanding the lowest possible voltage noise in unity-gain configurations - including scientific instrumentation, medical diagnostics, and metrology-grade measurement systems.
FAQ
What is the guaranteed voltage noise performance of the LT1128CS8#TRPBF at 10Hz?
The LT1128CS8#TRPBF has a typical voltage noise density of 1.0nV/√Hz at 10Hz, with a maximum of 1.2nV/√Hz per the datasheet's AC specifications. This low 1/f noise corner (14Hz) ensures minimal low-frequency drift in DC-coupled sensor amplifiers. All units undergo 100% production testing for 1kHz noise, and 10Hz noise is sample-tested per lot - with 100% 10Hz-tested units available on request.
Can the LT1128CS8#TRPBF be used as a unity-gain buffer without external compensation?
Yes, the LT1128CS8#TRPBF is internally compensated for stable operation at unity gain (AV = +1), unlike the LT1028. No external compensation components are required for basic buffer use. However, if driving capacitive loads >10pF, a small series resistor (e.g., 20Ω) at the output or optional over-compensation capacitor (Pin 5 to Pin 6) may be needed to maintain phase margin.
What is the maximum allowable supply voltage for the LT1128CS8#TRPBF?
The LT1128CS8#TRPBF supports ±22V maximum supply voltage at ambient temperatures from –55°C to 105°C, and ±16V maximum from 105°C to 125°C. For the commercial-grade LT1128CS8#TRPBF (0°C to 70°C), operation at ±15V is standard and fully characterized - delivering all specified noise, bandwidth, and linearity performance.
How does the LT1128CS8#TRPBF compare to the LT1028CS8#TRPBF in terms of stability and bandwidth?
The LT1128CS8#TRPBF is unity-gain stable (AV = +1), while the LT1028CS8#TRPBF is stable only at gains ≥ –1 (inverting). The LT1128CS8#TRPBF has a 13MHz minimum gain-bandwidth product and 5V/µs minimum slew rate, versus 50MHz GBW and 11V/µs for the LT1028CS8#TRPBF. Thus, LT1128CS8#TRPBF trades bandwidth for guaranteed non-inverting stability - ideal for buffers and followers.
Is the LT1128CS8#TRPBF pin-compatible with industry-standard op amp sockets?
Yes, the LT1128CS8#TRPBF in SOIC-8 (S8) package is pin-compatible with OP-07, OP-27, OP-37, LT1007, and LT1037 in DIP-8 footprints when using appropriate SOIC-to-DIP adapters. Its pinout matches standard 8-pin op amp conventions: Pin 1 (–IN), Pin 2 (+IN), Pin 3 (V–), Pin 4 (VOS TRIM), Pin 5 (OVER-COMP), Pin 6 (V+), Pin 7 (OUT), Pin 8 (VOS TRIM).
LT1128CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 6V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 7.6mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1128CS8#TRPBF FAQ
1.How can I place an order for LT1128CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1128CS8#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 LT1128CS8#TRPBF reliable?
The price and inventory of LT1128CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1128CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1128CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1128CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1128CS8#TRPBF?
LT1128CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1128CS8#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 LT1128CS8#TRPBF?
For technical support, including LT1128CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1128CS8#TRPBF requirements.
6.How does Aetrix verify that LT1128CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1128CS8#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 LT1128CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1128CS8#TRPBF?
All LT1128CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1128CS8#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 LT1128CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1128CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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