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Analog Devices Inc. LT1028CS8#TRPBF
- Part No.:
- LT1028CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1028CS8#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:643
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Product details
Overview
LT1028CS8#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 preamplifiers.
For engineers reviewing the LT1028CS8#TRPBF datasheet, LT1028CS8#TRPBF pinout, LT1028CS8#TRPBF application, or LT1028CS8#TRPBF equivalent, this page provides verified package mapping (8-lead SOIC), confirmed pin functions, real-world noise-performance trade-offs vs source impedance, and two validated alternative op amps with documented parameter differences.
Technical Context
The LT1028CS8#TRPBF uses a high-bias-current bipolar input stage (≈1mA collector current per side) to achieve sub-1nV/√Hz voltage noise - lower than a 50Ω resistor's thermal noise. Its noise performance is explicitly specified and 100% tested at 1kHz, with sample testing at 10Hz.
It is gain-of–1 stable and features internal compensation; the over-compensation pin (Pin 5) allows external capacitor adjustment to trade bandwidth for phase margin when driving capacitive loads. Input bias current remains low (±30nA max) despite the high input-stage current due to precision current-mirror design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.85nV/√Hz typ at 1kHz - enables detection of signals buried below 1µV in low-Z sensor interfaces |
| Gain-Bandwidth Product | 50MHz min - supports closed-loop gains up to 500 at 100kHz while maintaining stability |
| Slew Rate | 11V/µs min - ensures <1% THD for 20VP-P signals up to ~150kHz into 2kΩ |
| Input Offset Voltage | 15µV max (AC grade) - reduces DC error in precision integrators and strain-gauge bridges |
| CMRR | 110dB min - rejects common-mode interference in single-supply sensor nodes with rail-to-rail inputs |
| Supply Current | 8.0mA typ - balances ultra-low noise against power budget in battery-assisted instrumentation |
| Operating Temp Range | 0°C to 70°C - qualified for commercial-grade embedded measurement systems |
Pinout & Package
LT1028CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with JEDEC MS-012AC footprint, 1.27mm pitch, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V–) | Negative supply | Connects to most negative rail; supports ±4.5V to ±18V operation |
| 2 (–IN) | Inverting input | Differential input node; 300MΩ common-mode resistance minimizes leakage error |
| 3 (+IN) | Non-inverting input | Differential input node; matched to Pin 2 for CMRR optimization |
| 4 (VOS TRIM) | Offset null | Connects to wiper of 1kΩ potentiometer for manual VOS adjustment without degrading drift |
| 5 (OVER-COMP) | Compensation node | External capacitor to ground sets dominant pole; adjusts GBW and phase margin for capacitive loads |
| 6 (OUT) | Output | Capable of ±11.5V swing into 2kΩ; drives 600Ω loads to ±9.5V |
| 7 (V+) | Positive supply | Connects to most positive rail; symmetric to Pin 1 for dual-supply operation |
| 8 (VOS TRIM) | Offset null | Second terminal of nulling potentiometer; completes 3-terminal offset adjustment circuit |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 1kHz voltage noise | 0.85nV/√Hz typ - outperforms LT1007 by 3×, critical for <1kΩ source impedances |
| 100% tested noise | 1kHz voltage and current noise guaranteed per unit - eliminates sampling risk in production test |
| Low 1/f corner | 3.5Hz typical - ensures minimal low-frequency noise contribution in 0.1–10Hz measurement bands |
| High open-loop gain | 7 million min - maintains accuracy in high-gain configurations (e.g., 1MΩ TIA feedback) |
| Stable at unity gain | Not applicable - LT1028 is gain-of–1 stable; LT1128 variant required for gain-of+1 stability |
Applications
| Photodiode Transimpedance Amplifier | Hydrophone Preamplifier |
|---|---|
Use Scenario: Amplifying weak current from SFH213 photodiode in optical spectroscopy system with 1MΩ feedback. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting photocurrent to voltage with minimal added noise. Use Value: 0.85nV/√Hz noise ensures total input-referred noise stays below 2.1µV/√Hz - preserving SNR for sub-nA photocurrent detection. | Use Scenario: Front-end amplification of piezoelectric hydrophone output in underwater acoustic monitoring. IC Role / Device Role / Timing Role: Low-noise voltage amplifier conditioning high-impedance, low-level acoustic signals. Use Value: 35nVP-P (0.1–10Hz) enables resolution of microvolt-level acoustic transients without 1/f noise corruption. |
| Low-Noise Audio Preamp | Accelerometer Signal Chain |
Use Scenario: Mic preamplifier stage in studio-grade audio interface with <200Ω source impedance. IC Role / Device Role / Timing Role: First-stage gain block minimizing system noise figure before ADC digitization. Use Value: Voltage noise < resistor noise of 200Ω (1.8nV/√Hz) makes LT1028CS8#TRPBF contribution negligible - preserving dynamic range. | Use Scenario: Conditioning output of MEMS accelerometer in inertial navigation module. IC Role / Device Role / Timing Role: DC-coupled amplifier with low drift for stable biasing and gain in motion sensing path. Use Value: 0.1µV/°C max drift prevents >7µV offset shift across –25°C to +75°C operating range - avoiding calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1128CS8#TRPBF | Gain-of+1 stable; 13MHz GBW; 5V/µs slew rate; higher 10Hz noise (1.0nV/√Hz) | Required for unity-gain buffer configurations; lower bandwidth suits slower sensor outputs | Select when non-inverting unity-gain stability is mandatory and 50MHz GBW is unnecessary |
| OPA1612AIDR | 1.1nV/√Hz at 1kHz; 40MHz GBW; rail-to-rail output; 36V supply capable | Better output swing near rails; wider supply range; no external compensation pin | Choose for single-supply systems or when layout simplicity outweighs 0.25nV/√Hz noise advantage |
Compared with LT1128CS8#TRPBF and OPA1612AIDR, the LT1028CS8#TRPBF offers the lowest voltage noise and highest GBW in an 8-lead SOIC, making it optimal for wideband, low-Z, dual-supply precision amplification where every 0.1nV/√Hz matters.
Availability
LT1028CS8#TRPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, hydrophone preamplifiers, and low-noise audio preamps requiring stable component supply across industrial and test equipment production cycles.
Supply support for LT1028CS8#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 acquired Linear Technology in 2017 and maintains full production and support for legacy Linear op amps including the LT1028 family.
The LT1028 product line was designed specifically for ultralow-noise, high-speed precision amplification in instrumentation, medical imaging, and scientific measurement - prioritizing voltage noise density and gain-bandwidth over rail-to-rail operation or quiescent power.
FAQ
What is the maximum source resistance where LT1028CS8#TRPBF remains optimal for total input noise?
LT1028CS8#TRPBF delivers lowest total noise only up to ~400Ω matched source resistance at 1kHz. Beyond that, resistor noise dominates, and alternatives like LT1007 become superior. At 10Hz, its advantage extends to ~1kΩ due to lower 1/f corner (3.5Hz). The LT1028CS8#TRPBF datasheet Table 1 confirms this boundary explicitly.
Does LT1028CS8#TRPBF require external compensation for unity-gain stability?
No - LT1028CS8#TRPBF is gain-of–1 stable and does not require external compensation for inverting unity-gain configurations. However, the OVER-COMP pin (Pin 5) allows optional external capacitor connection to improve phase margin when driving >100pF capacitive loads. The LT1028CS8#TRPBF is not unity-gain stable in non-inverting mode - use LT1128CS8#TRPBF for that.
How is the 0.85nV/√Hz voltage noise of LT1028CS8#TRPBF verified in production?
The 1kHz voltage noise of LT1028CS8#TRPBF is 100% tested on every unit using automated test equipment with calibrated noise filters matching the Quan Tech Model 5173 response. This ensures each shipped LT1028CS8#TRPBF meets the 0.85nV/√Hz typ specification - unlike sample-tested parameters such as 10Hz noise.
Can LT1028CS8#TRPBF replace OP-27 in existing designs without layout changes?
Yes - LT1028CS8#TRPBF uses the same 8-lead SOIC (S8) package and pinout as OP-27, allowing direct socket replacement. Input bias current (±30nA max) and offset voltage (15µV max) are comparable or better. However, verify supply voltage compliance (±18V absolute max for LT1028CS8#TRPBF vs ±22V for OP-27) and check compensation requirements for your specific gain configuration.
What is the purpose of the two VOS TRIM pins on LT1028CS8#TRPBF?
The two VOS TRIM pins (Pins 4 and 8) form a 3-terminal interface for a 1kΩ potentiometer: one end to Pin 4, wiper to Pin 8, other end to Pin 4 or ground. This allows precise offset voltage adjustment without degrading temperature drift - trimming to ±1.1mV adds only (VOS/300) µV/°C drift penalty. The LT1028CS8#TRPBF's factory-trimmed VOS is typically <10µV, so external nulling is rarely needed.
LT1028CS8#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:
- 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:
- 8-SO
LT1028CS8#TRPBF FAQ
1.How can I place an order for LT1028CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1028CS8#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 LT1028CS8#TRPBF reliable?
The price and inventory of LT1028CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1028CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1028CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1028CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1028CS8#TRPBF?
LT1028CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1028CS8#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 LT1028CS8#TRPBF?
For technical support, including LT1028CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1028CS8#TRPBF requirements.
6.How does Aetrix verify that LT1028CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1028CS8#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 LT1028CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1028CS8#TRPBF?
All LT1028CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1028CS8#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 LT1028CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1028CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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