My Inquiry
My Account
Analog Devices Inc. LT1128CS8#PBF
- Part No.:
- LT1128CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1128CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,090
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1128CS8#PBF 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 typical voltage noise 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#PBF datasheet, LT1128CS8#PBF pinout, LT1128CS8#PBF application, or LT1128CS8#PBF equivalent, key selection criteria include its 10Hz–1kHz voltage noise performance, ±15V dual-supply operation, 0.1µV/°C typical drift, 7-million minimum open-loop gain, and compatibility with low-source-impedance (<400Ω) transducer interfaces where voltage noise dominates total system noise.
Technical Context
The LT1128CS8#PBF uses a high-bias-current bipolar input stage (≈1mA collector current per input transistor) to achieve sub-1nV/√Hz voltage noise - lower than the thermal noise of a 50Ω resistor. Its unity-gain stability is achieved via internal compensation, eliminating external capacitors required by the LT1028 (gain-of–1 stable variant).
Unlike general-purpose op amps, the LT1128CS8#PBF features fully tested 1kHz voltage and current noise, 100% production screening for noise parameters, and a 1/f voltage noise corner at 14Hz - enabling predictable low-frequency noise modeling in precision DC-coupled measurement chains.
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 sensor interfaces without dominating system noise floor |
| Gain-Bandwidth Product | 13MHz min - supports stable closed-loop bandwidth up to ~13MHz at unity gain for fast pulse amplification |
| Slew Rate | 5V/µs min - ensures <100ns rise time for 0.5V step inputs, critical for distortion-free audio and transient capture |
| Input Offset Voltage | 40µV max - reduces DC error in precision instrumentation without requiring external nulling circuitry |
| Open-Loop Voltage Gain | 7 million min - provides >137dB loop gain at 10Hz, ensuring high linearity and low harmonic distortion in feedback networks |
| Supply Current | 10.5mA max - balances ultralow-noise performance with moderate power consumption in ±15V systems |
| Input Bias Current | ±240nA max @ 85°C - remains low enough to avoid significant IR drop across high-value source resistors in TIA applications |
Pinout & Package
LT1128CS8#PBF is housed in an 8-lead plastic SOIC (Small Outline Integrated Circuit) package, surface-mount compatible, with JEDEC MS-012AC footprint, 1.27mm lead pitch, and 4.9mm × 3.9mm body size. Thermal resistance θJA = 140°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOS TRIM) | Offset Null Input | Connects to wiper of 1kΩ potentiometer for fine VOS adjustment; does not degrade temperature drift when trimmed to zero |
| 2 (–IN) | Inverting Input | Differential input node; low input capacitance (5pF) minimizes phase shift in high-frequency feedback paths |
| 3 (+IN) | Non-Inverting Input | Differential input node; matched to Pin 2 for CMRR >110dB up to 10kHz |
| 4 (V–) | Negative Supply Rail | Accepts –15V (max –22V); internal ESD protection diodes clamp differential input voltage to ±1.8V |
| 5 (OVER-COMP) | Overcompensation Node | Internal compensation pin; unused in standard configuration but allows external capacitor for enhanced stability with capacitive loads |
| 6 (OUT) | Output | Capable of ±11.0V swing into 2kΩ load; open-loop output impedance is 80Ω for predictable RC rolloff with feedback networks |
| 7 (V+) | Positive Supply Rail | Accepts +15V (max +22V); supply rejection ratio >114dB ensures immunity to rail noise in mixed-signal systems |
| 8 (VOS TRIM) | Offset Null Input | Second terminal of offset trim network; used with Pin 1 to form balanced nulling path |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 1kHz voltage noise | 0.85nV/√Hz typ - outperforms LT1007/LT1037 by 3×, enabling resolution of sub-µV signals in seismic or bio-potential sensors |
| 100% tested noise parameters | 1kHz voltage and current noise verified on every unit - eliminates sampling risk in mission-critical low-noise designs |
| Unity-gain stable architecture | No external compensation required - simplifies layout and improves reliability vs. decompensated alternatives like LT1028 |
| Low 1/f noise corner | 14Hz typical - ensures minimal flicker noise contribution in 0.1–10Hz EEG or geophone amplifiers |
| High PSRR and CMRR | 114dB PSRR / 110dB CMRR min - rejects power supply ripple and common-mode interference in single-ended sensor front-ends |
Applications
| Photodiode Transimpedance Amplifier | High-Fidelity Audio Preamplifier |
|---|---|
Use Scenario: Amplifying weak current from SFH213 photodiode in optical spectroscopy systems with 1MΩ feedback resistor. IC Role / Device Role / Timing Role: Precision transimpedance amplifier operating in DC–100kHz bandwidth with minimal added noise. Use Value: 0.85nV/√Hz input voltage noise ensures total referred input noise remains below 1.2pA/√Hz - preserving SNR in photon-starved measurements. | Use Scenario: First-stage gain block in studio microphone preamp handling 10mV–100mV dynamic capsule outputs. IC Role / Device Role / Timing Role: Low-distortion, low-noise voltage amplifier with 20kHz flat frequency response. Use Value: 0.0001% THD+N at 1kHz and 20VP-P output enables transparent gain staging without coloration or masking of subtle harmonics. |
| Infrared Detector Signal Chain | Accelerometer/Gyro Front-End |
Use Scenario: Conditioning output of thermopile-based IR sensor (e.g., MLX90614) with 50kΩ Thevenin source impedance. IC Role / Device Role / Timing Role: DC-coupled, low-drift amplifier for millivolt-level DC and low-frequency AC signals. Use Value: 0.1µV/°C typical drift and 40µV max VOS minimize thermal-induced baseline wander during ambient temperature shifts. | Use Scenario: Amplifying MEMS accelerometer output (e.g., ADXL355) with 350Ω bridge configuration and ratiometric excitation. IC Role / Device Role / Timing Role: Precision instrumentation amplifier driver with matched input impedance and high CMRR. Use Value: 110dB CMRR at 1kHz rejects bridge excitation feedthrough and EMI, preserving µg-level resolution in vibration monitoring. |
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#PBF | Gain-of–1 stable; higher GBW (50MHz min) and slew rate (11V/µs min); 0.85nV/√Hz same noise but requires external compensation | Better for high-speed inverting configurations (>10MHz closed-loop), less suitable for direct unity-gain buffering | Select LT1028CS8#PBF only when gain ≥ –1 is fixed and layout allows compensation capacitor; otherwise LT1128CS8#PBF offers simpler, more robust unity-gain operation |
| OPA1612AIDR | Lower supply current (2.6mA/ch); higher input impedance (10¹³Ω FET input); 1.1nV/√Hz noise at 1kHz - 0.25nV/√Hz noisier | Better for ultra-low-power, high-Z sources (>100kΩ); unsuitable for low-Z photodiode or bridge applications due to higher voltage noise | Choose OPA1612AIDR for battery-powered portable audio or piezoelectric sensors; avoid for <400Ω source impedances where LT1128CS8#PBF's voltage noise advantage is decisive |
Compared with LT1028CS8#PBF, the LT1128CS8#PBF trades 3.8× lower GBW for guaranteed unity-gain stability and simplified layout, while matching ultralow noise; versus OPA1612AIDR, it delivers 23% lower voltage noise at the cost of 4× higher supply current - making it superior for fixed-line, low-Z, high-SNR instrumentation.
Availability
LT1128CS8#PBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-fidelity audio preamplifiers, and infrared detector signal conditioning requiring stable component supply across industrial, test & measurement, and medical OEM programs.
Supply support for LT1128CS8#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, 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#PBF 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, audio mastering, and low-frequency sensor interfaces.
FAQ
What is the maximum source resistance for optimal noise performance with the LT1128CS8#PBF?
The LT1128CS8#PBF achieves lowest total input-referred noise with matched source resistances below 400Ω. At 1kHz, its 0.85nV/√Hz voltage noise dominates over resistor and current noise in this range. Above 400Ω, resistor noise increases as √R, and above 4kΩ, current noise becomes dominant - making alternative op amps like LT1007 more suitable. For photodiode TIAs, keep feedback and source impedances ≤400Ω to fully leverage the LT1128CS8#PBF's ultralow voltage noise advantage.
Can the LT1128CS8#PBF be used in single-supply applications?
The LT1128CS8#PBF is specified for dual-supply operation (±4.5V to ±22V) and is not characterized for true single-supply use. Its input common-mode range extends to within 1.5V of each rail, and output swing is limited to ±11.0V into 2kΩ with ±15V supplies - meaning it cannot drive rail-to-rail. While it may function with asymmetric supplies (e.g., +15V/0V), input offset drift, CMRR degradation, and reduced output headroom occur. For single-supply designs, consider purpose-built rail-to-rail op amps; the LT1128CS8#PBF should be used only in properly biased dual-supply systems.
Does the LT1128CS8#PBF require external compensation components?
No, the LT1128CS8#PBF is internally compensated for unity-gain stability and requires no external compensation capacitors under standard conditions. Unlike the LT1028CS8#PBF (which is gain-of–1 stable and requires external compensation for unity gain), the LT1128CS8#PBF can be configured as a stable voltage follower or non-inverting amplifier with gain ≥ +1 without additional components. An external capacitor may be added from Pin 5 (OVER-COMP) to ground only if driving heavy capacitive loads (>100pF) to improve phase margin - but this is optional and not required for basic operation.
How is the 10Hz voltage noise of the LT1128CS8#PBF verified?
The 10Hz voltage noise density of the LT1128CS8#PBF is sample-tested on every production lot, not 100% tested. Full 100% testing at 10Hz is available upon request for an additional charge. In contrast, 1kHz voltage and current noise are 100% tested on every unit using automated production test equipment correlated to Quan Tech Model 5173 reference measurements. The 10Hz value (1.0nV/√Hz typ) is inferred from the 1kHz result and 1/f corner frequency (14Hz), validated by correlation testing - ensuring statistical confidence in low-frequency noise performance without full-unit screening.
Is the LT1128CS8#PBF pin-compatible with OP-27 or LT1007 op amps?
Yes, the LT1128CS8#PBF is socket-compatible with OP-27, OP-37, LT1007, and LT1037 in 8-lead DIP or SOIC footprints - including identical pin 1–8 assignments for power, inputs, output, and offset trim. No PCB changes are needed for drop-in replacement. However, because the LT1128CS8#PBF has higher supply current (10.5mA vs. ~4mA for OP-27), ensure thermal and power delivery margins accommodate the increase. Also verify that unity-gain stability meets the target circuit's phase margin requirements - unlike OP-27, the LT1128CS8#PBF does not require external compensation in follower configurations.
LT1128CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1128CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1128CS8#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 LT1128CS8#PBF reliable?
The price and inventory of LT1128CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1128CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1128CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1128CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1128CS8#PBF?
LT1128CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1128CS8#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 LT1128CS8#PBF?
For technical support, including LT1128CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1128CS8#PBF requirements.
6.How does Aetrix verify that LT1128CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1128CS8#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 LT1128CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1128CS8#PBF?
All LT1128CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1128CS8#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 LT1128CS8#PBF part is unused and in its original packaging.
Return procedure for LT1128CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1128CS8#PBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
