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Analog Devices Inc. LT1028ACN8#PBF
- Part No.:
- LT1028ACN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1028ACN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:131
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Product details
Overview
LT1028ACN8#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, hydrophone front-ends, and precision instrumentation.
For engineers reviewing the LT1028ACN8#PBF datasheet, LT1028ACN8#PBF pinout, LT1028ACN8#PBF application, or LT1028ACN8#PBF equivalent, key selection criteria include verified 10Hz–1kHz voltage noise performance, guaranteed AC-grade specifications over 0°C to 70°C, DIP-8 package compatibility with legacy OP-07/OP-27 sockets, and absence of external compensation requirements in unity-gain-stable configurations.
Technical Context
The LT1028ACN8#PBF employs a high-bias-current bipolar input stage (≈1mA collector current per side) to achieve sub-1nV/√Hz voltage noise, while maintaining only 25nA max input bias current via precision current-mirror cancellation. Its internal compensation ensures stability at gain ≥ –1 without external components.
Unlike the LT1128 variant, the LT1028ACN8#PBF is specified for inverting configurations with minimum closed-loop gain of –1; it achieves 50MHz GBW and 11V/µs slew rate under ±15V supply, with 114dB CMRR and 117dB PSRR supporting high-precision DC-coupled measurement paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.85nV/√Hz typ @ 1kHz - enables system noise floor < 1nV/√Hz when source impedance < 400Ω |
| Gain-Bandwidth Product | 50MHz min - supports stable closed-loop operation up to 500kHz with gain = 100 |
| Slew Rate | 11V/µs min - preserves fidelity of >1MHz small-signal transients without slewing distortion |
| Input Offset Voltage | 15µV max @ 25°C - reduces DC error in precision sensor interfaces without trimming |
| Offset Drift | 0.1µV/°C typ - limits thermal-induced error to < 7µV over 0°C–70°C operating range |
| Supply Current | 8.0mA typ - balances ultralow noise against power budget in battery-sensitive instrumentation |
| Output Swing | ±11.5V min into 2kΩ - provides >23Vpp dynamic range for ±15V supplies |
Pinout & Package
LT1028ACN8#PBF uses an 8-pin plastic dual-in-line package (PDIP), with industry-standard pinout compatible with OP-07 and OP-27 sockets. The package features through-hole mounting, 0.3" width, and JEDEC MS-001 compliant dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS TRIM | Connects to wiper of 1kΩ potentiometer for manual offset adjustment; unused pins left open |
| 2 | –IN | Inverting input terminal; low-impedance node for feedback networks and signal inversion |
| 3 | +IN | Non-inverting input terminal; high-impedance node for reference or sensor inputs |
| 4 | V– | Negative supply rail connection; must be decoupled with 0.1µF ceramic capacitor near pin |
| 5 | OVER-COMP | Over-compensation capacitor connection (to V+); optional for enhanced phase margin at high gains |
| 6 | OUT | Amplified output terminal; capable of sourcing/sinking ±35mA peak into resistive loads |
| 7 | V+ | Positive supply rail connection; requires local 0.1µF ceramic decoupling |
| 8 | VOS TRIM | Second trim terminal; used with Pin 1 to form balanced nulling network |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow voltage noise | 0.85nV/√Hz typ @ 1kHz - outperforms LT1007 by 3×, enabling detection of sub-nV signals |
| 100% tested noise | 1kHz voltage and current noise verified on every unit - eliminates sampling risk in critical analog chains |
| Socket-compatible footprint | Direct replacement for OP-07/OP-27 in existing DIP-8 layouts - no PCB redesign required |
| Stable at G = –1 | No external compensation needed for inverting configurations - simplifies layout and reduces BOM count |
| Low 1/f corner | 3.5Hz typical - minimizes low-frequency drift in DC-coupled sensor amplifiers |
Applications
| Photodiode Transimpedance Amplifier | Hydrophone Preamplifier |
|---|---|
Use Scenario: Amplifying weak current signals from silicon photodiodes in spectroscopy systems with 1MΩ feedback resistance. 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 system noise remains below 2µV/√Hz at 1kHz, preserving SNR in low-light detection. | Use Scenario: Conditioning acoustic pressure signals from underwater piezoelectric hydrophones with <100Ω source impedance. IC Role / Device Role / Timing Role: Low-noise前置 amplifier providing 40dB gain before ADC digitization. Use Value: Sub-1nV/√Hz voltage noise dominates over hydrophone self-noise, maximizing dynamic range in oceanographic sensing. |
| Accelerometer Signal Chain | Bridge-Based Strain Gauge Interface |
Use Scenario: Amplifying mV-level outputs from MEMS accelerometers in inertial navigation units. IC Role / Device Role / Timing Role: First-stage gain block in DC-coupled signal path with ultra-low drift. Use Value: 0.1µV/°C drift contributes < 7µV error across 0°C–70°C, maintaining calibration integrity without recalibration. | Use Scenario: Amplifying differential output from 350Ω Wheatstone bridge strain gauges in load cells. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with matched input impedance and high CMRR. Use Value: 114dB CMRR rejects common-mode bridge excitation noise, improving resolution by >16 bits. |
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 2.5nV/√Hz noise at 1kHz; lower 1.5MHz GBW; no 100% noise testing | Acceptable where noise < 3nV/√Hz suffices and bandwidth < 1MHz is adequate | Select when cost sensitivity outweighs ultralow-noise requirement and legacy LT1007 design reuse is prioritized |
| OP27GPZ | 1.9nV/√Hz noise; 8MHz GBW; higher 0.2µV/°C drift; requires external nulling for best DC performance | Preferred in general-purpose lab equipment where moderate noise and proven reliability are sufficient | Choose when replacing aging OP27 designs and full LT1028ACN8#PBF noise performance is unnecessary |
Compared with LT1007CN8#PBF and OP27GPZ, the LT1028ACN8#PBF delivers a 3× noise advantage and 6× bandwidth increase - critical for wideband, low-amplitude signal capture - but requires tighter layout attention to avoid pickup due to its extreme sensitivity.
Availability
LT1028ACN8#PBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, hydrophone preamplifiers, and accelerometer signal chains requiring stable component supply across extended production lifecycles.
Supply support for LT1028ACN8#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 support for legacy Linear op amp portfolios including the LT1028 series.
The LT1028ACN8#PBF belongs to Linear's precision op amp product line, engineered specifically for applications demanding the lowest possible voltage noise in low-impedance sensor interfaces and high-fidelity signal chains.
FAQ
What is the maximum source impedance for optimal noise performance of the LT1028ACN8#PBF?
The LT1028ACN8#PBF achieves minimum total input-referred noise when source impedance is ≤400Ω. Above this value, resistor noise dominates; above 20kΩ, current noise becomes dominant. For photodiode TIA designs with 1MΩ feedback, the LT1028ACN8#PBF remains optimal due to its unmatched voltage noise contribution.
Does the LT1028ACN8#PBF require external compensation capacitors?
No - the LT1028ACN8#PBF is internally compensated for unity-gain stability in inverting configurations (gain ≥ –1). External over-compensation (Pin 5 to Pin 6) is optional and only recommended for marginal phase margin in high-gain non-inverting setups, which the LT1028ACN8#PBF does not support.
Can the LT1028ACN8#PBF replace OP-07 or OP-27 in existing designs?
Yes - the LT1028ACN8#PBF uses identical DIP-8 pinout and operates from ±15V supplies like OP-07/OP-27. It fits directly into their sockets without layout changes. However, its lower input offset (15µV vs. 25µV for OP-27) and higher slew rate may reveal previously masked bandwidth limitations in surrounding circuitry.
Is 10Hz voltage noise tested on every LT1028ACN8#PBF unit?
No - 10Hz voltage noise is sample-tested per lot, not 100% tested. The LT1028ACN8#PBF datasheet guarantees 1.0nV/√Hz max at 10Hz based on statistical correlation with 1kHz 100% testing. Units with 100% 10Hz testing are available on request with additional cost and lead time.
What is the thermal performance limitation of the LT1028ACN8#PBF in continuous operation?
The LT1028ACN8#PBF has a maximum junction temperature of 150°C and θJA = 150°C/W in the N8 package. At 8.0mA supply current and ±15V rails, power dissipation is ~240mW; with 150°C/W thermal resistance, junction temperature rise is ~36°C above ambient - well within safe limits for operation up to 70°C ambient.
LT1028ACN8#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:
- 25 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 7.4mA
- 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
LT1028ACN8#PBF FAQ
1.How can I place an order for LT1028ACN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1028ACN8#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 LT1028ACN8#PBF reliable?
The price and inventory of LT1028ACN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1028ACN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1028ACN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1028ACN8#PBF transactions.
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4.How is shipping managed for LT1028ACN8#PBF?
LT1028ACN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1028ACN8#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 LT1028ACN8#PBF?
For technical support, including LT1028ACN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1028ACN8#PBF requirements.
6.How does Aetrix verify that LT1028ACN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1028ACN8#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 LT1028ACN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1028ACN8#PBF?
All LT1028ACN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1028ACN8#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 LT1028ACN8#PBF part is unused and in its original packaging.
Return procedure for LT1028ACN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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