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Analog Devices Inc. LT1028CSW#PBF
- Part No.:
- LT1028CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1028CSW#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,093
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Product details
Overview
LT1028CSW#PBF 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 voltage noise at 1kHz, 50MHz gain-bandwidth product, 11V/µs slew rate, ±11.5V output swing into 2kΩ, and 0.1µV/°C typical offset drift - enabling use in photodiode transimpedance amplifiers, audio preamps, and sensor front-ends where noise dominates system performance.
For engineers reviewing the LT1028CSW#PBF datasheet, LT1028CSW#PBF pinout, LT1028CSW#PBF application, or LT1028CSW#PBF equivalent, key selection criteria include verified 0.1Hz–10Hz noise (35nVP-P), guaranteed 100% tested 1kHz voltage/current noise, stable operation at unity gain (via external compensation), and compatibility with SOIC-16 wide-body PCB footprints requiring no layout revision from legacy LT1028 variants.
Technical Context
The LT1028CSW#PBF employs a high-bias-current bipolar input stage (≈1mA collector current per side) to achieve sub-1nV/√Hz voltage noise - lower than the thermal noise of a 50Ω resistor. Its noise performance is validated across 0.1Hz–10Hz (35nVP-P) and 10Hz/1kHz spectral densities (1.0/0.85nV/√Hz), with 1/f corner at 3.5Hz.
Stability is managed via external over-compensation capacitor (pin 5 to pin 6), supporting closed-loop gains ≥ –1 while maintaining phase margin >60° with 10pF capacitive load. Input bias current remains low (±30nA max) despite high transconductance, enabled by precision bias cancellation circuitry that minimizes correlated current noise contributions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.85nV/√Hz typ @ 1kHz - enables detection of signals buried below thermal noise of 50Ω sources |
| 0.1Hz–10Hz Noise | 35nVP-P typ - critical for DC-coupled sensor amplification without 1/f drift corruption |
| Gain-Bandwidth Product | 50MHz min - supports high-fidelity amplification up to ~500kHz at gain=100 |
| Slew Rate | 11V/µs min - ensures distortion-free reproduction of 1VP-P signals up to ~1.7MHz |
| Input Offset Voltage | 40µV max - reduces DC error in precision integrators and bridge amplifiers |
| Offset Drift | 0.8µV/°C max - maintains accuracy across industrial temperature range (0°C to 70°C) |
| Supply Current | 10.5mA max - balances ultralow noise against power budget in battery-sensitive designs |
Pinout & Package
LT1028CSW#PBF is housed in a 16-lead plastic SOIC (wide) package (SW package), with exposed pad for thermal enhancement and standard 1.27mm pitch. Pin 1 is marked by notch/dot; pins 1–8 occupy one side, pins 9–16 the opposite.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15, 16 | No Connect (NC) | Unused internal nodes - must be left floating or tied to ground per layout best practices |
| 3 | VOS TRIM (–) | Inverting input to internal offset nulling network - connect 1kΩ potentiometer wiper here for manual VOS adjustment |
| 4 | –IN | Inverting input - primary feedback node for closed-loop configurations |
| 5 | +IN | Non-inverting input - reference point for differential sensing |
| 6 | V– | Negative supply rail - connects to –15V (or –5V to –18V) with local 0.1µF bypass |
| 7 | NC | No Connect - electrically isolated; leave unconnected |
| 8 | NC | No Connect - electrically isolated; leave unconnected |
| 9 | NC | No Connect - electrically isolated; leave unconnected |
| 10 | NC | No Connect - electrically isolated; leave unconnected |
| 11 | V+ | Positive supply rail - connects to +15V (or +5V to +18V) with local 0.1µF bypass |
| 12 | OUT | Amplifier output - drives loads ≥600Ω; requires series resistor for capacitive loads >100pF |
| 13 | OVER-COMP | Over-compensation terminal - connect capacitor (15–30pF) from pin 13 to pin 5 to stabilize unity-gain configurations |
| 14 | VOS TRIM (+) | Non-inverting input to internal offset nulling network - connect opposite end of 1kΩ potentiometer here |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 1kHz voltage noise | 0.85nV/√Hz typ - outperforms LT1007/LT1037 by 3×, enabling detection of sub-nanovolt signals |
| 100% production-tested noise | 1kHz voltage & current noise verified on every unit - eliminates sampling risk in high-reliability systems |
| External over-compensation | Pin 13-to-pin 5 capacitor interface - allows stable unity-gain operation without sacrificing bandwidth or noise |
| Low drift with temperature | 0.8µV/°C max offset drift - ensures <5µV total drift over 0°C–70°C operating range |
| High open-loop gain | 7 million min voltage gain - maintains linearity and CMRR (>110dB) under varying load conditions |
Applications
| Low-Noise Photodiode Amplifier | High-Fidelity Audio Preamp |
|---|---|
Use Scenario: Amplifying weak current from SFH213 photodiode in spectroscopy equipment with 1MΩ transimpedance gain. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting photocurrent to voltage with minimal added noise. Use Value: 0.85nV/√Hz input noise ensures total system noise dominated by photodiode shot noise, not amplifier contribution. | Use Scenario: First-stage gain block in studio microphone preamplifier requiring THD <0.001% at 1kHz. IC Role / Device Role / Timing Role: Low-distortion, low-noise voltage amplifier with 11V/µs slew rate preserving transient fidelity. Use Value: 35nVP-P 0.1Hz–10Hz noise prevents audible "hiss" in quiet passages; 50MHz GBW supports full audio bandwidth. |
| Bridge Sensor Signal Conditioning | Magnetic Search Coil Amplifier |
Use Scenario: Amplifying mV-level differential output from 350Ω Wheatstone bridge in strain gauge load cell. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with high CMRR and low offset drift. Use Value: 0.1µV/°C drift and 114dB CMRR minimize thermal and common-mode errors in industrial weighing systems. | Use Scenario: Integrating low-frequency magnetic field signals from search coil in geophysical survey equipment. IC Role / Device Role / Timing Role: Ultra-low-noise integrator with sub-1nV/√Hz density for detecting µV-level induced voltages. Use Value: 3.5Hz 1/f corner and 35nVP-P 0.1Hz–10Hz noise enable accurate integration down to 0.1Hz without drift saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1007CN8#PBF | Higher 1kHz voltage noise (2.5nV/√Hz), lower GBW (6MHz), DIP-8 package | Better suited for medium-noise, low-power applications where 0.85nV/√Hz is unnecessary | Select when cost sensitivity outweighs ultralow-noise requirement and SOIC-16 footprint is not mandatory |
| OPA1612AIDR | Lower current noise (0.6pA/√Hz), dual-channel, 100% 1kHz noise tested, SOIC-8 | Preferred for dual-amplifier layouts or high-source-impedance (>1kΩ) sensors where current noise dominates | Choose for space-constrained dual-channel designs or when matching LT1028CSW#PBF's noise floor is not required |
Compared with LT1007CN8#PBF and OPA1612AIDR, the LT1028CSW#PBF uniquely combines sub-1nV/√Hz voltage noise with 50MHz bandwidth in a single-channel SOIC-16 package - making it irreplaceable in ultra-low-noise, wideband single-ended front-ends where voltage noise is the limiting factor.
Availability
LT1028CSW#PBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-resolution audio preamplifiers, and precision bridge sensor interfaces requiring stable component supply across extended production cycles.
Supply support for LT1028CSW#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 acquired Linear Technology in 2017 and maintains full production, testing, and documentation for legacy Linear op amps including the LT1028 family.
The LT1028 product line was engineered specifically for applications demanding the lowest possible voltage noise floor in high-speed precision amplification - targeting scientific instrumentation, medical diagnostics, and high-end audio where signal integrity is paramount.
FAQ
What is the maximum capacitive load the LT1028CSW#PBF can drive stably?
The LT1028CSW#PBF can drive up to 10pF capacitive load in unity-gain configuration without external compensation. For loads >10pF, stability is ensured by connecting a 15–30pF capacitor between pin 13 (OVER-COMP) and pin 5 (+IN). This over-compensation technique preserves phase margin above 60° while maintaining usable bandwidth - critical for driving ADC input filters or long cables in data acquisition systems. The LT1028CSW#PBF datasheet validates this behavior up to 100pF with appropriate compensation.
Does the LT1028CSW#PBF require external nulling components for precision DC performance?
No - the LT1028CSW#PBF features factory-trimmed input offset voltage (40µV max) and drift (0.8µV/°C max), eliminating need for external nulling in most applications. However, pin 3 (VOS TRIM –) and pin 14 (VOS TRIM +) support connection of a 1kΩ potentiometer for fine adjustment if sub-10µV offset is required. Using this pot adds only (VOS/300)µV/°C drift penalty - e.g., adjusting to 300µV introduces just 1µV/°C extra drift. The LT1028CSW#PBF's internal trimming makes it drop-in compatible with OP-07/OP-27 sockets without modification.
How does the LT1028CSW#PBF's noise performance compare to the LT1128 variant?
The LT1028CSW#PBF is optimized for inverting configurations (gain ≥ –1), delivering 0.85nV/√Hz noise at 1kHz and 50MHz GBW. The LT1128 offers +1-gain stability but trades noise (0.9nV/√Hz) and bandwidth (13MHz GBW) for unity-gain robustness. Both share identical 35nVP-P 0.1Hz–10Hz noise and 0.1µV/°C drift specs. Thus, the LT1028CSW#PBF is preferred when maximum bandwidth and lowest voltage noise are prioritized in inverting topologies, while LT1128 suits non-inverting buffers where stability trumps noise.
Is the LT1028CSW#PBF suitable for single-supply operation?
The LT1028CSW#PBF is specified for dual-supply operation (±4.5V to ±18V) and is not characterized for true single-supply use. Its input common-mode range extends to ±11V with ±15V supplies, but input stage headroom and output swing degrade significantly below ±5V. For single-supply applications requiring similar noise performance, consider the ADA4898-1 (1.1nV/√Hz, 1GHz GBW) or OPA1611 (1.1nV/√Hz, 45MHz GBW) - both designed for 2.7V–36V operation. The LT1028CSW#PBF's architecture assumes symmetric rails for optimal noise and linearity.
What thermal considerations apply to the LT1028CSW#PBF in SOIC-16 wide-body package?
The LT1028CSW#PBF in SW package has θJA = 130°C/W and θJC = 40°C/W. At 10.5mA supply current and ±15V rails, power dissipation reaches ~315mW - raising junction temperature by ~41°C above ambient in standard 2-layer PCB layout. To maintain <125°C TJ, keep ambient ≤84°C or add copper pour under the exposed pad. The LT1028CSW#PBF's noise and drift specs are guaranteed over 0°C–70°C case temperature; exceeding this range risks parametric shift. Thermal design must prioritize heatsinking over speed optimization.
LT1028CSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1028CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1028CSW#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 LT1028CSW#PBF reliable?
The price and inventory of LT1028CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1028CSW#PBF is usually 5 days.
3.What payment methods are accepted for LT1028CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1028CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1028CSW#PBF?
LT1028CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1028CSW#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 LT1028CSW#PBF?
For technical support, including LT1028CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1028CSW#PBF requirements.
6.How does Aetrix verify that LT1028CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LT1028CSW#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 LT1028CSW#PBF meets industry standards.
7.What is the process for return or replacement of LT1028CSW#PBF?
All LT1028CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1028CSW#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 LT1028CSW#PBF part is unused and in its original packaging.
Return procedure for LT1028CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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