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Analog Devices Inc. LT1128CN8#PBF
- Part No.:
- LT1128CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1128CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,340
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Product details
Overview
LT1128CN8#PBF from Analog Devices (formerly Linear Technology) is a precision, ultralow-noise, unity-gain-stable operational amplifier in an 8-lead PDIP package. It delivers 0.85nV/√Hz typical input 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 LT1128CN8#PBF datasheet, LT1128CN8#PBF pinout, LT1128CN8#PBF application, or LT1128CN8#PBF equivalent, key selection criteria include its 10Hz–1kHz voltage noise performance, ±15V dual-supply operation, 0.1µV/°C typical offset drift, stable +1 closed-loop gain configuration, and compatibility with low-impedance (<400Ω) source networks where voltage noise dominates total system noise.
Technical Context
The LT1128CN8#PBF uses a high-bias-current bipolar input stage (≈1mA collector current per input transistor) to achieve sub-1nV/√Hz voltage noise, while maintaining only 25nA typical input bias current via internal cancellation circuitry. Its unity-gain stability is achieved through internal compensation, eliminating external capacitors required by the LT1028 variant.
It operates over 0°C to 70°C (Commercial grade), supports ±4.5V to ±18V supply ranges, and features 110dB minimum CMRR and 114dB minimum PSRR - enabling precision DC-coupled amplification in noisy industrial or instrumentation environments without significant common-mode or supply-induced error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.85nV/√Hz typ @ 1kHz - enables detection of sub-µV signals in low-Z transducer interfaces |
| Gain-Bandwidth Product | 13MHz min - supports stable 100kHz closed-loop bandwidth at gain = 100 |
| Slew Rate | 5V/µs min - ensures <1% THD for 20VP-P output at 10kHz with 600Ω load |
| Input Offset Voltage | 40µV max - reduces DC error to <4mV in ×100 gain stages without trimming |
| Offset Drift | 0.8µV/°C max - limits thermal drift to <56µV over 70°C ambient range |
| Supply Current | 10.5mA max - balances ultralow noise with moderate power consumption in battery-adjacent analog front-ends |
| Common-Mode Rejection | 110dB min - rejects >100,000:1 of supply- or ground-borne interference |
Pinout & Package
LT1128CN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.3-inch width, JEDEC MS-001 compliant footprint, and through-hole mounting. Thermal resistance θJA = 150°C/W enables operation up to 70°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | Differential input node; high-impedance, low-bias-current terminal for feedback network connection |
| 2 | Non-Inverting Input (+IN) | Differential input node; referenced to system ground or bias voltage in single-ended configurations |
| 3 | V– | Negative supply rail; must be decoupled with ≥0.1µF ceramic capacitor near pin |
| 4 | V+ | Positive supply rail; requires local 0.1µF ceramic bypass to minimize supply-induced noise coupling |
| 5 | Output (OUT) | Class-A output stage capable of ±11.5V swing into 2kΩ load; drives cables or ADC inputs directly |
| 6 | Over-Compensation (OVER-COMP) | Internal compensation node; left unconnected for unity-gain stability (default configuration) |
| 7 | VOS TRIM | Offset nulling terminal; used with 1kΩ potentiometer between Pins 1 and 5 for fine DC adjustment |
| 8 | VOS TRIM | Second offset nulling terminal; completes 3-terminal potentiometer connection for VOS trimming |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 1kHz voltage noise | 0.85nV/√Hz typ - outperforms most precision op amps below 400Ω source impedance |
| Unity-gain stable architecture | No external compensation required - simplifies layout and eliminates stability tuning for buffer applications |
| 100% tested voltage noise | 1kHz en guaranteed per unit - eliminates sampling uncertainty in noise-critical production test |
| Low 10Hz flicker noise | 1.0nV/√Hz typ - maintains signal integrity in DC-coupled EEG, hydrophone, and bridge amplifier designs |
| High PSRR & CMRR | 114dB PSRR / 110dB CMRR min - preserves accuracy in shared-supply mixed-signal systems |
Applications
| Audio Preamp Stage | Photodiode TIA |
|---|---|
Use Scenario: Low-noise microphone or phono cartridge preamplification with 100Ω–1kΩ source impedance. IC Role / Device Role / Timing Role: First-stage voltage amplifier operating at gain = 100–1000 with DC-coupled output. Use Value: 0.85nV/√Hz noise ensures <1µV RMS integrated noise over 20Hz–20kHz, preserving dynamic range in professional audio paths. | Use Scenario: Converting photocurrent from SFH213 or similar PIN diodes into voltage with 1MΩ transimpedance gain. IC Role / Device Role / Timing Role: Transimpedance amplifier with unity-gain stability and low input capacitance (5pF). Use Value: Enables 350kHz small-signal bandwidth at 1MΩ gain while suppressing resistor Johnson noise contribution. |
| Accelerometer Signal Chain | Bridge Amplifier for Load Cells |
Use Scenario: Conditioning mV-level outputs from piezoresistive MEMS accelerometers with 350Ω nominal bridge impedance. IC Role / Device Role / Timing Role: Instrumentation-grade differential amplifier with matched gain-setting resistors. Use Value: 40µV max VOS and 0.8µV/°C drift limit zero-error shift to <3mV over full 0°C–70°C operating range. | Use Scenario: Amplifying Wheatstone bridge outputs from strain-gauge-based load cells with 350Ω elements. IC Role / Device Role / Timing Role: Precision in-amp front-end configured as difference amplifier with gain = 100. Use Value: 110dB CMRR rejects common-mode bridge excitation ripple, while low noise preserves µV-level resolution. |
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 |
|---|---|---|---|
| LT1028CN8#PBF | Inverting-stable only (gain ≥ –1); 75MHz GBW; 11V/µs SR; higher noise at >10kHz due to wider bandwidth | Better for high-speed inverting gain stages (>100kHz), less suitable for unity-gain buffers or photodiode TIAs | Select LT1028CN8#PBF when closed-loop gain is ≥ –1 and bandwidth >20MHz is required |
| OPA1612AIDR | FET-input; 1.1nV/√Hz @ 1kHz; rail-to-rail output; 40MHz GBW; lower IB (1.3pA) but higher voltage noise | Preferred for ultra-high-Z sources (>100kΩ) or single-supply systems; unsuitable for <400Ω source impedance | Choose OPA1612AIDR for JFET-input benefits and rail-to-rail output where voltage noise >1nV/√Hz is acceptable |
Compared with LT1028CN8#PBF and OPA1612AIDR, LT1128CN8#PBF uniquely combines unity-gain stability, sub-0.9nV/√Hz noise, and bipolar input linearity - making it the optimal choice for low-impedance, DC-coupled, high-dynamic-range analog front-ends where gain = +1 is mandatory.
Availability
LT1128CN8#PBF is available at Aetrix Electronics and suitable for high-fidelity audio preamplifiers, photodiode transimpedance amplifiers, accelerometer signal conditioners, and precision bridge sensor interfaces requiring stable component supply across industrial and medical design cycles.
Supply support for LT1128CN8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1128 belongs to Linear Technology's precision op amp product line, engineered specifically for applications demanding the lowest possible voltage noise in unity-gain configurations - including scientific instrumentation, medical diagnostics, and high-end audio.
FAQ
What is the maximum operating temperature range for the LT1128CN8#PBF?
The LT1128CN8#PBF is specified for commercial temperature operation from 0°C to 70°C. It is not rated for extended industrial (–40°C to 85°C) or military (–55°C to 125°C) ranges; those grades require LT1128ACN8#PBF or LT1128AMN8#PBF variants. The N8 package has θJA = 150°C/W, limiting practical ambient use to ≤65°C at full 10.5mA supply current without heatsinking.
Can the LT1128CN8#PBF drive a 600Ω load at ±10V output swing?
Yes - the LT1128CN8#PBF guarantees ±10.5V minimum output swing into 600Ω at 0°C to 70°C, per Electrical Characteristics table on page 4 of the datasheet. At 25°C and ±15V supplies, typical performance reaches ±11.0V. This makes LT1128CN8#PBF suitable for driving legacy audio line inputs, ADC drivers, and low-impedance sensor interfaces without external buffering.
Is the LT1128CN8#PBF pin-compatible with the OP-27 or LT1007?
No - the LT1128CN8#PBF uses an 8-pin DIP pinout optimized for its internal compensation and offset trim architecture (Pins 6–8 assigned to OVER-COMP and dual VOS TRIM). OP-27 and LT1007 follow standard 8-pin op amp pinouts (Pin 1 = NC or offset null, Pin 5 = NC or offset null, Pin 6 = OUT). Direct socket replacement is not possible without PCB modification or adapter.
Does the LT1128CN8#PBF require external compensation capacitors?
No - the LT1128CN8#PBF is internally compensated for unity-gain stability. Pin 6 (OVER-COMP) is reserved for optional external over-compensation in specialized low-noise, low-distortion configurations but must remain unconnected for standard +1 gain operation. Unlike the LT1028, no external capacitor is needed to ensure stability at gain = +1.
How is input offset voltage trimmed in the LT1128CN8#PBF?
The LT1128CN8#PBF undergoes wafer-level laser trimming of input offset voltage, achieving 40µV max without external components. For finer adjustment, a 1kΩ potentiometer is connected between Pin 1 (–IN), Pin 5 (OUT), and Pin 7/8 (VOS TRIM terminals), enabling ±1.1mV adjustment range. Trimming introduces predictable drift: (VOS/300) µV/°C - e.g., 300µV trim adds 1µV/°C drift.
LT1128CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1128CN8#PBF FAQ
1.How can I place an order for LT1128CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1128CN8#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 LT1128CN8#PBF reliable?
The price and inventory of LT1128CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1128CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1128CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1128CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1128CN8#PBF?
LT1128CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1128CN8#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 LT1128CN8#PBF?
For technical support, including LT1128CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1128CN8#PBF requirements.
6.How does Aetrix verify that LT1128CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1128CN8#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 LT1128CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1128CN8#PBF?
All LT1128CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1128CN8#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 LT1128CN8#PBF part is unused and in its original packaging.
Return procedure for LT1128CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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