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Analog Devices Inc. LT1028CN8#PBF
- Part No.:
- LT1028CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1028CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:682
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Product details
Overview
LT1028CN8#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 typical voltage noise at 1kHz, 50MHz minimum gain-bandwidth product, 11V/µs minimum slew rate, ±11.5V output swing into 2kΩ, and 0.1µV/°C typical input offset drift - enabling high-fidelity amplification in photodiode transimpedance stages and audio front-ends.
For engineers reviewing the LT1028CN8#PBF datasheet, LT1028CN8#PBF pinout, LT1028CN8#PBF application, or LT1028CN8#PBF equivalent, key selection criteria include verified 10Hz–1kHz voltage noise performance, guaranteed gain-bandwidth under ±15V supply, thermal stability across 0°C to 70°C, and compatibility with legacy OP-27/OP-37 sockets without layout modification.
Technical Context
The LT1028CN8#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 architecture avoids JFET inputs to preserve voltage noise dominance while maintaining 25nA max input bias current via precision current mirroring.
Stability is ensured for inverting configurations (gain ≥ –1) through internal compensation; unity-gain stability requires the LT1128 variant. The device features dual trim pins (VOS TRIM) for post-mount offset adjustment without degrading temperature drift, and robust ±22V absolute maximum supply rating supports industrial ±15V systems.
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 |
| Gain-Bandwidth Product | 50MHz min - supports stable closed-loop gain of 100 up to 500kHz |
| Slew Rate | 11V/µs min - preserves fidelity of >10VP-P signals at >1MHz without slewing distortion |
| Input Offset Voltage | 40µV max - ensures ≤4mV error in 100× gain stages without trimming |
| Offset Drift | 0.8µV/°C max - limits drift-induced error to <56µV over 70°C ambient range |
| Supply Current | 10.5mA max - balances ultralow noise against power budget in precision analog chains |
| CMRR | 110dB min - rejects common-mode interference in bridge sensor interfaces |
Pinout & Package
LT1028CN8#PBF is housed in an 8-lead plastic DIP (N8 package), 0.300" wide, with JEDEC MS-001AC footprint and 150°C max junction temperature. Pin 1 is top-left corner (notch-down orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOS TRIM) | Offset null input | Connect wiper of 1kΩ pot between Pins 1 and 8 to adjust VOS; preserves 0.1µV/°C drift if trimmed to zero |
| 2 (–IN) | Inverting input | High-impedance differential node; matched to Pin 3 for CMRR optimization |
| 3 (+IN) | Non-inverting input | Accepts low-impedance sensor signals; thermally symmetric layout critical for drift control |
| 4 (V–) | Negative supply | Must be decoupled with 0.1µF ceramic near pin; supports –22V abs max |
| 5 (OUT) | Output | Capable of ±11.5V swing into 2kΩ; drives 600Ω loads with ≤1.5V drop |
| 6 (OVER-COMP) | Overcompensation | Optional capacitor (15–30pF) to Pin 7 improves stability with capacitive loads >10pF |
| 7 (+IN) | Positive supply | Must be decoupled with 0.1µF ceramic near pin; supports +22V abs max |
| 8 (VOS TRIM) | Offset null reference | Completes trim network; tie to Pin 1 via potentiometer wiper |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 10Hz voltage noise | 1.0nV/√Hz typ - essential for DC-coupled infrared detector and hydrophone preamps |
| 100% tested 1kHz noise | Guaranteed ≤1.7nV/√Hz max - eliminates sampling uncertainty in production test |
| Low 0.1Hz–10Hz flicker noise | 35nVP-P typ - minimizes baseline wander in accelerometer and gyro signal chains |
| High PSRR | 114dB min - maintains accuracy in noisy industrial power environments |
| Socket-compatible replacement | Direct fit for OP-27/OP-37 footprints - reduces redesign effort in legacy instrumentation |
Applications
| Photodiode Transimpedance Amplifier | High-Fidelity Audio Preamp |
|---|---|
Use Scenario: Amplifying weak current from SFH213 photodiode in optical spectroscopy systems. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with 1MΩ feedback resistor and 0.5pF compensation. Use Value: 0.85nV/√Hz noise ensures signal-to-noise ratio >90dB for 10nA photocurrents at 1kHz. | Use Scenario: Low-noise microphone preamplifier stage in studio recording interfaces. IC Role / Device Role / Timing Role: First-stage gain block with 100× non-inverting configuration and ±15V rails. Use Value: 35nVP-P 0.1Hz–10Hz noise prevents audible hiss in 20Hz–20kHz audio band. |
| Bridge Sensor Signal Conditioning | Magnetic Search Coil Amplifier |
Use Scenario: Amplifying differential output from 350Ω Wheatstone bridge in load cell measurement. IC Role / Device Role / Timing Role: Instrumentation-grade difference amplifier with matched 10kΩ gain-setting resistors. Use Value: 110dB CMRR rejects bridge excitation ripple; 0.8µV/°C drift limits calibration interval to 6 months. | Use Scenario: Integrating output of search coil magnetometer for geophysical surveying. IC Role / Device Role / Timing Role: Low-drift integrator with 100nF capacitor and 10kΩ feedback resistor. Use Value: Sub-1nV/√Hz noise enables detection of <1pT magnetic fields at 10Hz without cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDR | 2.1nV/√Hz noise @ 1kHz, 40MHz GBW, JFET input, lower IB (1.3pA) | Better for high-Z sources (>10kΩ); unsuitable for <100Ω source impedance due to higher voltage noise | Select when input bias current dominates noise budget and source impedance exceeds 1kΩ |
| LT1007CN8#PBF | 2.0nV/√Hz noise @ 1kHz, 8MHz GBW, bipolar input, 40nA IB | Lower bandwidth suits DC–100kHz sensor interfaces; less demanding on PCB layout for stability | Choose for cost-sensitive, lower-frequency applications where 0.85nV/√Hz noise is unnecessary |
Compared with OPA1612AIDR and LT1007CN8#PBF, the LT1028CN8#PBF uniquely delivers sub-1nV/√Hz noise with 50MHz bandwidth - making it irreplaceable in ultralow-noise, wideband applications like photodiode TIA and RF receiver IF amplifiers where both noise floor and speed are simultaneously critical.
Availability
LT1028CN8#PBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-fidelity audio preamplifiers, and bridge sensor signal conditioning requiring stable component supply across industrial, test equipment, and medical OEM programs.
Supply support for LT1028CN8#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 LT1028 series belongs to Linear Technology's precision op amp product line, engineered specifically for applications demanding the lowest possible voltage noise in high-speed, DC-coupled signal paths - including scientific instrumentation, defense electronics, and high-end audio.
FAQ
What is the maximum operating temperature range for LT1028CN8#PBF?
The LT1028CN8#PBF is specified for operation from 0°C to 70°C (Commercial grade). Its absolute maximum junction temperature is 150°C, and storage temperature range extends from –65°C to +150°C. For extended temperature ranges (e.g., –40°C to +85°C), consult Analog Devices' I-grade variants such as LT1028ACN8#PBF.
Can LT1028CN8#PBF be used in unity-gain non-inverting configurations?
No - the LT1028CN8#PBF is only stable for inverting gains of –1 or greater. Unity-gain buffer operation requires the LT1128CN8#PBF, which is explicitly gain-of-+1 stable. Attempting unity-gain non-inverting use with LT1028CN8#PBF will cause oscillation due to insufficient phase margin.
How is input offset voltage trimmed in LT1028CN8#PBF?
The LT1028CN8#PBF undergoes wafer-level laser trimming of input offset voltage, achieving 40µV max without external components. Pins 1 and 8 support optional fine-tuning using a 1kΩ potentiometer; adjusting to zero preserves the 0.1µV/°C typical drift, while non-zero settings add (VOS/300)µV/°C drift penalty.
Does LT1028CN8#PBF require external compensation capacitors?
External compensation is optional. Pin 6 (OVER-COMP) allows connection of a 15–30pF capacitor to Pin 7 (+VS) to improve phase margin when driving capacitive loads >10pF. For purely resistive loads ≤10pF, no external capacitor is needed - the LT1028CN8#PBF is internally compensated for gain ≥ –1.
Is LT1028CN8#PBF lead-free and RoHS compliant?
Yes - the "#PBF" suffix denotes lead-free finish and RoHS compliance per EU Directive 2011/65/EU. The device uses matte tin plating over copper leads and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH.
LT1028CN8#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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1028CN8#PBF FAQ
1.How can I place an order for LT1028CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1028CN8#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 LT1028CN8#PBF reliable?
The price and inventory of LT1028CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1028CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1028CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1028CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1028CN8#PBF?
LT1028CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1028CN8#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 LT1028CN8#PBF?
For technical support, including LT1028CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1028CN8#PBF requirements.
6.How does Aetrix verify that LT1028CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1028CN8#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 LT1028CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1028CN8#PBF?
All LT1028CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1028CN8#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 LT1028CN8#PBF part is unused and in its original packaging.
Return procedure for LT1028CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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