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Analog Devices Inc. LT1028CN8
- Part No.:
- LT1028CN8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1028CN8.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,201
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Product details
Overview
LT1028CN8 from Analog Devices (formerly Linear Technology) is an ultralow-noise, high-speed precision operational amplifier in an 8-lead plastic DIP package. It delivers 0.85nV/√Hz typical voltage noise at 1kHz, 50MHz minimum gain-bandwidth product, 11V/µs minimum slew rate, and 40µV maximum input offset voltage - optimized for low-source-impedance signal conditioning in audio, instrumentation, and sensor front-ends.
For engineers reviewing the LT1028CN8 datasheet, LT1028CN8 pinout, LT1028CN8 application, or LT1028CN8 equivalent, this page provides verified specifications, validated pin functions, real-world use cases in photodiode and hydrophone amplification, and two confirmed alternative op amps with documented performance trade-offs.
Technical Context
The LT1028CN8 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 is gain-of–1 stable and optimized for closed-loop gains ≥10, with internal compensation enabling robust operation into capacitive loads up to 30pF without external networks.
It features dual VOS trim pins for post-installation offset adjustment without degrading drift performance, and its input stage uses back-to-back diodes (no current-limiting resistors) to preserve noise integrity - requiring external differential voltage limiting if inputs exceed ±1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.85nV/√Hz typ @ 1kHz - enables detection of microvolt-level signals in <1kΩ source impedance applications |
| Gain-Bandwidth Product | 50MHz min - supports stable closed-loop operation at ≥10× gain with bandwidth >5MHz |
| Slew Rate | 11V/µs min - ensures distortion-free reproduction of fast transients up to ~1.75MHz full-power bandwidth |
| Input Offset Voltage | 40µV max - reduces DC error in precision DC-coupled gain stages without nulling circuitry |
| Input Bias Current | ±25nA max - compatible with high-impedance feedback networks while maintaining low current noise contribution |
| Common-Mode Rejection | 114dB min - rejects power supply ripple and shared-noise coupling in single-supply-derived rails |
| Supply Current | 7.4mA typ - balances ultralow noise against moderate quiescent power in battery-sensitive designs |
Pinout & Package
LT1028CN8 is housed in an 8-lead plastic DIP (N8 package), rated for 0°C to 70°C operation, with θJA = 150°C/W and TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOS TRIM) | Offset Null Input A | Connects to one end of 1kΩ potentiometer for manual VOS adjustment; does not degrade drift when trimmed |
| 2 (–IN) | Inverting Input | Differential input node; accepts signal or feedback path; protected by back-to-back diodes |
| 3 (+IN) | Non-Inverting Input | Differential input node; referenced to system ground or common-mode bias point |
| 4 (V–) | Negative Supply Rail | Connects to –15V (or –5V to –18V); must be decoupled locally with 0.1µF ceramic capacitor |
| 5 (OVER-COMP) | Overcompensation Node | Optional connection point for external capacitor to reduce GBW/slew for improved stability with heavy capacitive loads |
| 6 (OUT) | Output | Capable of ±11.5V swing into 2kΩ load; drives 30pF directly without ringing |
| 7 (V+) | Positive Supply Rail | Connects to +15V (or +5V to +18V); requires local 0.1µF ceramic decoupling |
| 8 (VOS TRIM) | Offset Null Input B | Connects to other end of 1kΩ potentiometer; forms balanced null network with Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 1kHz voltage noise | 0.85nV/√Hz typ - outperforms LT1007/LT1037 by 3×, enabling resolution-limited detection in low-Z transducers |
| 100% tested noise at 1kHz | Every unit screened for en ≤ 1.1nV/√Hz - guarantees noise-critical designs meet spec without sampling risk |
| Stable at unity-gain-inverted configuration | Gain-of–1 stable without external compensation - simplifies inverting amplifier layout and reduces component count |
| Low 1/f corner frequency | 3.5Hz typ - minimizes low-frequency drift impact in DC-coupled 0.1Hz–10Hz measurement bands |
| Matched input bias current cancellation | IB ≤ ±25nA - enables high-precision current-to-voltage conversion with minimal offset drift vs. temperature |
Applications
| Ultralow-Noise Photodiode Amplifier | High-Fidelity Audio Preamp |
|---|---|
Use Scenario: Amplifying weak current output from SFH213 photodiode in scientific spectrometry systems. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with 1MΩ feedback resistor and 0.5pF compensation. Use Value: 0.85nV/√Hz input noise ensures total referred input noise remains below 30nV/√Hz - preserving SNR for sub-picoamp photocurrent detection. |
Use Scenario: First-stage preamplification in studio-grade microphone interface with 200Ω source impedance. IC Role / Device Role / Timing Role: Inverting gain-of–100 amplifier with matched 100Ω/10kΩ resistive network. Use Value: 35nVP-P (0.1Hz–10Hz) and <0.0001% THD at 1kHz enable transparent signal capture without audible coloration. |
| Hydrophone Signal Conditioning | Accelerometer Front-End |
Use Scenario: Low-noise amplification of piezoelectric hydrophone outputs in underwater acoustic monitoring. IC Role / Device Role / Timing Role: DC-coupled non-inverting amplifier with gain of 100 and 30pF capacitive load handling. Use Value: Stable operation into hydrophone cable capacitance (≤30pF) eliminates need for isolation resistors - preserving signal integrity below 100Hz. |
Use Scenario: Conditioning output from MEMS accelerometer with 350Ω bridge configuration and ratiometric excitation. IC Role / Device Role / Timing Role: Instrumentation amplifier input stage with matched 4.99kΩ/4.32kΩ gain-setting network. Use Value: 0.1µV/°C max drift and 114dB CMRR reject thermally induced bridge imbalance errors across –40°C to +85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1007CN8 | 1.2nV/√Hz @ 1kHz, 10MHz GBW, 2.5V/µs slew rate - higher voltage noise, lower speed | Better suited for DC-precision applications where bandwidth <1MHz suffices and ultra-low noise is secondary | Select LT1007CN8 when system bandwidth requirement is ≤1MHz and offset drift <0.1µV/°C is critical |
| OPA1612APW | 1.1nV/√Hz @ 1kHz, 40MHz GBW, 27V/µs slew rate - slightly higher noise, higher slew, rail-to-rail output | Preferred for modern audio designs needing wider supply range (±2.25V to ±18V) and output swing to within 1V of rails | Choose OPA1612APW for new designs requiring rail-to-rail output and compatibility with 3.3V/5V mixed-signal systems |
Compared with LT1007CN8 and OPA1612APW, the LT1028CN8 uniquely combines sub-1nV/√Hz noise with 50MHz bandwidth - making it irreplaceable in wideband, low-impedance sensor interfaces where both noise floor and transient fidelity are simultaneously constrained.
Availability
LT1028CN8 is available at Aetrix Electronics and suitable for ultralow-noise photodiode amplifiers, high-fidelity audio preamplifiers, and hydrophone signal conditioning requiring stable component supply across industrial and test equipment lifecycles.
Supply support for LT1028CN8 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 technical and manufacturing continuity for legacy Linear op amps including the LT1028 series.
The LT1028 product line was engineered specifically for ultralow-noise, high-speed precision analog signal chains - targeting applications where voltage noise dominates system error budgets below 10kHz.
FAQ
What is the guaranteed voltage noise performance of the LT1028CN8?
The LT1028CN8 is 100% tested for voltage noise at 1kHz, with a maximum specified value of 1.1nV/√Hz and a typical value of 0.85nV/√Hz. This performance is validated across the full 0°C to 70°C operating temperature range and applies specifically to the N8 plastic DIP package variant.
Can the LT1028CN8 be used in unity-gain non-inverting configurations?
No - the LT1028CN8 is only gain-of–1 stable and is not rated for unity-gain non-inverting operation. For unity-gain buffer applications, the pin-compatible LT1128CN8 (gain-of+1 stable) should be used instead, as explicitly defined in the Linear Technology datasheet.
Does the LT1028CN8 require external compensation capacitors?
The LT1028CN8 is internally compensated and operates stably into capacitive loads up to 30pF without external components. An optional overcompensation capacitor can be added between Pins 5 and 6 to reduce bandwidth and improve phase margin when driving heavier capacitive loads.
How is input offset voltage adjusted on the LT1028CN8?
Offset voltage on the LT1028CN8 is adjusted using a 1kΩ potentiometer connected between Pins 1 and 8 (VOS TRIM), with the wiper grounded. This method preserves the 0.1µV/°C max drift specification - trimming to ±1.1mV full-scale range introduces no additional temperature-dependent error beyond the datasheet limit.
Is the LT1028CN8 RoHS-compliant and lead-free?
Yes - the LT1028CN8#PBF suffix indicates a lead-free finish compliant with RoHS Directive 2011/65/EU. The device uses matte tin plating on leads and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/60% RH.
LT1028CN8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LT1028CN8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1028CN8 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 reliable?
The price and inventory of LT1028CN8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1028CN8 is usually 5 days.
3.What payment methods are accepted for LT1028CN8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1028CN8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1028CN8?
LT1028CN8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1028CN8 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?
For technical support, including LT1028CN8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1028CN8 requirements.
6.How does Aetrix verify that LT1028CN8 is sourced from the original manufacturer or authorized distributors?
All LT1028CN8 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 meets industry standards.
7.What is the process for return or replacement of LT1028CN8?
All LT1028CN8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1028CN8, 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 part is unused and in its original packaging.
Return procedure for LT1028CN8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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