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Analog Devices Inc. LT1028CSW#TRPBF
- Part No.:
- LT1028CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1028CSW#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
LT1028CSW#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-noise, high-speed precision operational amplifier optimized for low-source-impedance signal conditioning. It delivers 0.85nV/√Hz typical voltage noise at 1kHz, 50MHz gain-bandwidth product, 11V/µs slew rate, ±11.5V output swing into 2kΩ, and 0.1µV/°C max drift - enabling use in photodiode transimpedance amplifiers, hydrophone front-ends, and low-noise audio preamps.
For engineers reviewing the LT1028CSW#TRPBF datasheet, LT1028CSW#TRPBF pinout, LT1028CSW#TRPBF application, or LT1028CSW#TRPBF equivalent, key selection criteria include verified 10Hz–1kHz voltage noise performance, SOIC-16 wide-body package thermal behavior, gain-of–1 stability, and compatibility with ±15V supplies in precision analog signal chains requiring <40µV offset and <1nV/√Hz noise floor.
Technical Context
The LT1028CSW#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 input bias current via precision current cancellation circuitry. Its 1/f voltage noise corner is 3.5Hz, and it operates stably at unity-gain (AV = –1), unlike many ultralow-noise op amps requiring minimum gain.
This architecture enables true DC precision (10µV max offset, 0.8µV/°C max drift) alongside wideband performance (75MHz typ GBW, 11V/µs min slew rate), making it suitable for applications where both nanovolt-level signal integrity and fast transient response are simultaneously required - such as infrared detector amplification and magnetic search coil interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.85nV/√Hz typ at 1kHz - sets fundamental noise floor for source impedances <400Ω |
| Gain-Bandwidth Product | 50MHz min - supports stable closed-loop gain ≥10 up to 5MHz |
| Slew Rate | 11V/µs min - ensures distortion-free 20VP-P output at 100kHz |
| Input Offset Voltage | 40µV max - enables DC-coupled sensor interfaces without external nulling |
| CMRR | 114dB min - rejects common-mode interference in bridge-based transducer circuits |
| Supply Current | 9.5mA max - balances ultralow noise with moderate power consumption |
| Operating Temp Range | 0°C to 70°C - validated for commercial-grade instrumentation and audio systems |
Pinout & Package
LT1028CSW#TRPBF is housed in a 16-lead plastic SOIC (wide-body) package (SW package), with exposed pad not electrically connected. Thermal resistance θJA = 130°C/W enables operation at full rated supply (±15V) without forced airflow in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15, 16 | No Connect | Unused pins; must remain unconnected per datasheet - no internal function |
| 3 | Inverting Input (–IN) | Differential input node; low impedance path for feedback networks |
| 4 | Non-Inverting Input (+IN) | High-impedance input; sensitive to thermoelectric EMF - requires matched trace routing |
| 5 | Over-Compensation Terminal | Connects to Pin 6 to reduce bandwidth/slew for improved stability with capacitive loads |
| 6 | VOS Trim / Over-Compensation | Adjustable offset trim point (1kΩ pot) or compensation node for >10pF load handling |
| 7 | Output (OUT) | Capable of ±11.5V swing into 2kΩ; drives 600Ω loads with ≤1.5V drop |
| 8 | Negative Supply (V–) | Accepts –22V absolute max; connects to system ground reference in single-supply configurations |
| 9 | Positive Supply (V+) | Accepts +22V absolute max; decoupling with 0.1µF ceramic + 4.7µF tantalum recommended |
| 10–14 | No Connect | Unbonded; floating - no PCB routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 1kHz voltage noise | 0.85nV/√Hz typ - outperforms LT1007/LT1037 by 3×, critical for photodiode TIA designs |
| 100% tested voltage noise | 1kHz en guaranteed per unit - eliminates sampling risk in production test validation |
| Gain-of–1 stable architecture | No minimum closed-loop gain required - simplifies unity-gain buffer and inverter design |
| Low 1/f noise corner | 3.5Hz - preserves low-frequency SNR in seismic and bio-signal amplification |
| Matched input bias cancellation | 25nA max IB - enables high-impedance sensor interfacing without resistor-induced noise penalty |
Applications
| Photodiode Transimpedance Amplifier | Hydrophone Preamplifier |
|---|---|
Use Scenario: Amplifying weak current signals from silicon photodiodes in spectroscopy systems with 1MΩ feedback. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with ultra-low input-referred voltage noise dominating total noise budget. Use Value: Enables detection of sub-picoamp photocurrents with 35nVP-P (0.1–10Hz) baseline noise - directly improving optical signal resolution. | Use Scenario: Conditioning low-level acoustic pressure signals from piezoelectric hydrophones in underwater sensing arrays. IC Role / Device Role / Timing Role: First-stage low-noise voltage amplifier with high PSRR (117dB) rejecting power supply ripple in battery-powered deployments. Use Value: Maintains 0.85nV/√Hz noise floor at 1kHz while delivering 11V/µs slew rate - preserving transient fidelity of impulsive underwater events. |
| Infrared Detector Front-End | Accelerometer Signal Chain |
Use Scenario: Amplifying microvolt-level thermopile outputs in non-contact temperature measurement modules. IC Role / Device Role / Timing Role: DC-coupled, low-drift (0.1µV/°C) amplifier with 40µV max VOS minimizing calibration burden. Use Value: Reduces system-level offset drift error to <0.5°C over 0–70°C ambient range - eliminating need for frequent recalibration. | Use Scenario: Conditioning analog outputs from MEMS accelerometers in vibration monitoring equipment. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buffer isolating accelerometer from downstream ADC driver stages. Use Value: Achieves 114dB CMRR and 117dB PSRR - suppressing EMI and supply noise that would otherwise corrupt 16-bit+ dynamic range measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-noise operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1007CN8#PBF | Higher 1kHz voltage noise (1.2nV/√Hz), 8-lead PDIP, lower GBW (6MHz) | Better suited for DC-precision-only applications where speed is secondary to long-term drift stability | Select when board space allows DIP and 10MHz bandwidth suffices; avoid for >100kHz TIA designs |
| OPA1612AIDR | Lower current noise (0.6pA/√Hz), dual-channel, rail-to-rail output, but higher voltage noise (1.1nV/√Hz) | Preferred for dual-channel audio line drivers or differential receivers where channel matching matters | Choose for stereo audio or matched-pair instrumentation; not for single-ended, sub-1nV/√Hz front-ends |
Compared with LT1007CN8#PBF and OPA1612AIDR, the LT1028CSW#TRPBF uniquely combines 0.85nV/√Hz noise, 50MHz GBW, and SOIC-16 thermal performance - making it irreplaceable in high-speed, low-impedance sensor interfaces demanding both bandwidth and nanovolt sensitivity.
Availability
LT1028CSW#TRPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, hydrophone preamplifiers, and infrared detector front-ends requiring stable component supply across industrial, test & measurement, and medical OEM programs.
Supply support for LT1028CSW#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1028 series belongs to Linear Technology's precision op amp product line, designed specifically for applications where voltage noise, DC accuracy, and wideband performance must coexist - including scientific instrumentation, defense electronics, and high-fidelity audio.
FAQ
What is the maximum supply voltage rating for LT1028CSW#TRPBF?
The LT1028CSW#TRPBF has an absolute maximum supply voltage rating of ±22V at temperatures from –55°C to 105°C, and ±16V from 105°C to 125°C. For standard operation at 0°C to 70°C, ±15V is the recommended supply. Exceeding these limits risks permanent damage, and operation above ±16V at elevated temperatures violates the device's safe operating area as defined in the Absolute Maximum Ratings table of the LT1028 datasheet.
Does LT1028CSW#TRPBF require external compensation for stability?
The LT1028CSW#TRPBF is gain-of–1 stable and does not require external compensation under standard resistive-load conditions. However, when driving capacitive loads >10pF (e.g., coaxial cables or ADC inputs), connecting Pin 5 to Pin 6 adds over-compensation capacitance to reduce bandwidth and improve phase margin. This configuration trades slew rate and bandwidth for enhanced stability - a documented option in the LT1028 datasheet Figure 21 and Applications Information section.
Is LT1028CSW#TRPBF pin-compatible with older LT1028 variants like LT1028CN8#PBF?
No, LT1028CSW#TRPBF is not pin-compatible with LT1028CN8#PBF. The former uses a 16-lead SOIC (wide) package with multiple NC pins and dedicated over-compensation terminals (Pins 5 and 6), while the latter is an 8-lead PDIP with standard op amp pinout (V+, –IN, +IN, V–, OUT, VOS TRIM). PCB layout, footprint, and bypassing requirements differ significantly - direct substitution requires redesign.
What is the 0.1Hz to 10Hz peak-to-peak noise specification for LT1028CSW#TRPBF?
The LT1028CSW#TRPBF has a typical 0.1Hz to 10Hz input-referred voltage noise of 35nVP-P, with a maximum of 75nVP-P across the C-grade temperature range (0°C to 70°C). This specification is measured using the test circuit in Figure 2 of the LT1028 datasheet, with strict thermal shielding and five-minute warm-up to minimize thermoelectric and drift artifacts - confirming its suitability for low-frequency precision measurement systems.
Can LT1028CSW#TRPBF be used in single-supply configurations?
Yes, LT1028CSW#TRPBF can operate from a single supply (e.g., +30V and GND), provided the input common-mode range (±10.5V min) and output swing (±11.5V into 2kΩ) remain within valid bounds relative to the chosen reference. Biasing the +IN terminal at mid-supply (e.g., +15V) enables rail-to-rail input handling, but output swing remains asymmetric - full negative swing is lost. For true single-supply operation with ground-referenced inputs, external level-shifting or a dedicated rail-splitter is required.
LT1028CSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 15V/µs
- Gain Bandwidth Product:
- 75 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:
- 16-SO
LT1028CSW#TRPBF FAQ
1.How can I place an order for LT1028CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1028CSW#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 LT1028CSW#TRPBF reliable?
The price and inventory of LT1028CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1028CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1028CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1028CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1028CSW#TRPBF?
LT1028CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1028CSW#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 LT1028CSW#TRPBF?
For technical support, including LT1028CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1028CSW#TRPBF requirements.
6.How does Aetrix verify that LT1028CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1028CSW#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 LT1028CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1028CSW#TRPBF?
All LT1028CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1028CSW#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 LT1028CSW#TRPBF part is unused and in its original packaging.
Return procedure for LT1028CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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