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Analog Devices Inc. LT1490CN8#PBF
- Part No.:
- LT1490CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1490CN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:438
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Product details
Overview
LT1490CN8#PBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail input and output micropower operational amplifier in an 8-lead PDIP package. It operates from total supply voltages of 2V to 44V, draws only 50µA per amplifier, delivers ±20mA output current, supports rail-to-rail input common-mode range up to 44V beyond V–, and is reverse-battery protected to 18V - ideal for battery monitoring and sensor conditioning in portable industrial systems.
For engineers reviewing the LT1490CN8#PBF datasheet, LT1490CN8#PBF pinout, LT1490CN8#PBF application, or LT1490CN8#PBF equivalent, key selection criteria include its 200kHz gain-bandwidth product, 98dB CMRR, 1500V/mV large-signal voltage gain, rail-to-rail I/O capability on single supplies down to 2V, and verified operation across –40°C to 85°C with no phase reversal.
Technical Context
The LT1490CN8#PBF employs a dual-input-stage architecture (NPN and PNP) enabling operation with inputs up to 44V above V– and 0.3V above V+, while maintaining high impedance and no phase reversal. Its unique input stage allows common-mode operation beyond the positive rail without clamping diodes or degradation in bias current.
Internally compensated for unity-gain stability, it drives capacitive loads up to 10,000pF using optional 0.22µF + 150Ω output compensation. The device features reverse-supply protection (≤1nA current at –18V), no supply sequencing requirements, and stable performance across 3V, 5V, and ±15V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 44V total - enables direct sensing in 24V/36V industrial buses and 48V telecom systems without level-shifting. |
| Quiescent Current | 50µA per amplifier max - supports multi-year battery life in remote sensor nodes and portable instrumentation. |
| Input Common-Mode Range | –0.4V to 44V - accepts signals beyond rails (e.g., battery voltage monitoring with ground-referenced shunt). |
| Output Swing | Rail-to-rail (e.g., 4.95V high / 22mV low at 5V supply) - maximizes dynamic range in low-voltage ADC front-ends. |
| Gain Bandwidth Product | 200kHz - sufficient for precision DC-coupled signal conditioning, active filtering, and 4–20mA transmitter loops. |
| CMRR | 98dB - rejects noise in high-impedance sensor bridges and current-sense amplifiers operating near noisy power rails. |
| Large-Signal Voltage Gain | 1500V/mV - ensures <100µV error in closed-loop gain configurations for high-accuracy measurement. |
Pinout & Package
LT1490CN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300-inch body width, through-hole mounting, and JEDEC-standard pinout. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | High-impedance differential input node; accepts voltages from –0.4V to 44V relative to V–. |
| 2 | Non-Inverting Input (Amplifier A) | Same voltage range and architecture as Pin 1; enables rail-to-rail common-mode operation. |
| 3 | Output (Amplifier A) | Rail-to-rail output capable of sourcing/sinking ±20mA; drives 10kΩ load to within 22mV of rails at 5V. |
| 4 | V– (Negative Supply) | Reference for both amplifiers; reverse-battery protected to –18V; substrate diode limits forced output below V–. |
| 5 | Non-Inverting Input (Amplifier B) | Independent input stage identical to Pin 2; supports separate sensor channel or reference buffer. |
| 6 | Inverting Input (Amplifier B) | Matches Pin 1 functionality; enables dual-channel differential sensing or dual feedback paths. |
| 7 | Output (Amplifier B) | Electrically isolated from Output A; same drive strength and rail-to-rail swing capability. |
| 8 | V+ (Positive Supply) | Bypass with 0.01µF capacitor; reverse-supply protected; removal shuts down device (<0.1nA bias current). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal acquisition on single 3V/5V supplies without external level-shifting circuitry. |
| Reverse battery protection to 18V | Eliminates need for external series diode or protection IC in automotive and portable battery-powered designs. |
| No phase reversal over full input range | Guarantees predictable output polarity even when inputs exceed V+ or fall 22V below V– - critical for safety-critical monitoring. |
| Drives 10,000pF with optional compensation | Supports long cable runs, LCD biasing, and capacitive sensor interfaces without oscillation or instability. |
| Specified on 3V, 5V, and ±15V supplies | Validated performance across legacy and modern supply domains - simplifies design reuse and qualification. |
Applications
| Battery Monitoring | Sensor Conditioning |
|---|---|
Use Scenario: Real-time monitoring of 12V/24V lead-acid or Li-ion battery packs in portable medical devices and UPS systems. IC Role / Device Role / Timing Role: Dual op amp configured as differential shunt-current amplifier and rail-to-rail voltage follower for battery voltage sensing. Use Value: 50µA quiescent current extends runtime; 44V input range accommodates full pack voltage plus transients; no phase reversal prevents false fault triggers during deep discharge. | Use Scenario: Signal conditioning for resistive bridge sensors (e.g., strain gauges, pressure transducers) in industrial IoT nodes. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with rail-to-rail output driving 16-bit SAR ADC reference and input buffers. Use Value: 98dB CMRR rejects supply noise; 1500V/mV open-loop gain ensures <50µV offset error; 200kHz GBW supports anti-alias filtering up to 20kHz. |
| 4–20mA Transmitter | Micropower Active Filter |
Use Scenario: Loop-powered 4–20mA current transmitters for temperature, flow, or level sensors in hazardous-area process control. IC Role / Device Role / Timing Role: Dual op amp implementing voltage-to-current conversion and sensor linearization in two-quadrant operation. Use Value: 2V minimum supply enables operation directly from loop power; rail-to-rail output ensures full 20mA compliance; reverse protection guards against wiring faults. | Use Scenario: Low-power anti-aliasing and noise-rejection filters in battery-operated data loggers and environmental monitors. IC Role / Device Role / Timing Role: Dual op amp configured as 2nd-order Sallen-Key low-pass filter with unity-gain buffer stages. Use Value: 200kHz GBW supports cutoff frequencies up to 20kHz; 50µA per amplifier minimizes system power; 10,000pF drive capability stabilizes filter response with ceramic capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1490CS8#PBF | Same electrical specs but in 8-lead SOIC (S8) package; θJA = 190°C/W vs 130°C/W for N8. | Preferred for surface-mount production; less suitable for prototyping or through-hole test fixtures. | Select LT1490CS8#PBF for automated assembly; retain LT1490CN8#PBF for breadboarding, legacy board compatibility, or thermal margin in low-airflow enclosures. |
| LT1490CMS8#PBF | Same specs in 8-lead MSOP (MS8); higher density, θJA = 250°C/W; requires fine-pitch rework capability. | Used where PCB area is constrained (e.g., wearables, compact modules); not compatible with DIP sockets or hand soldering. | Choose LT1490CMS8#PBF only when space is critical and thermal management includes copper pour or airflow; avoid for high-reliability or serviceable designs. |
Compared with LT1490CS8#PBF and LT1490CMS8#PBF, the LT1490CN8#PBF offers superior thermal performance (130°C/W) and mechanical robustness for manual assembly, debugging, and environments with vibration or thermal cycling - making it optimal for industrial field instruments and evaluation platforms.
Availability
LT1490CN8#PBF is available at Aetrix Electronics and suitable for battery monitoring, sensor conditioning, 4–20mA transmitters, and micropower active filters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT1490CN8#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 technical and manufacturing continuity for legacy Linear op amp families.
The LT1490 series belongs to Linear's precision micropower op amp product line, designed specifically for ultra-low-power, wide-supply, rail-to-rail signal conditioning in portable and industrial sensing applications.
FAQ
What is the maximum supply voltage rating for the LT1490CN8#PBF?
The LT1490CN8#PBF has an absolute maximum total supply voltage (V+ to V–) of 44V. Operating continuously at this limit is permitted per the Absolute Maximum Ratings table; however, thermal design must ensure junction temperature remains ≤150°C. Derating is recommended above 36V under full load.
Does the LT1490CN8#PBF support true rail-to-rail input when powered from a 3V single supply?
Yes - the LT1490CN8#PBF guarantees rail-to-rail input common-mode range from –0.4V to 44V, which includes the full 0V to 3V span on a 3V supply. This allows direct interfacing with sensors or DACs referenced to ground or V+, without external level-shifting circuitry.
Can the LT1490CN8#PBF drive a 10kΩ load to within 50mV of each rail at 5V supply?
Yes - at VS = 5V, the LT1490CN8#PBF delivers VOH ≥ 4.95V (within 50mV of V+) and VOL ≤ 50mV (within 50mV of V–) under no-load conditions. With 5mA sink/source, VOL rises to 450mV and VOH drops to 2.55V - still compliant for many 12-bit ADC interfaces.
Is the LT1490CN8#PBF pin-compatible with newer LT1490A variants?
No - while functionally similar, the LT1490A/LT1491A are improved versions with tighter VOS (500µV max vs 1200µV) and enhanced PSRR. They share identical pinouts and packages, including LT1490ACN8#PBF, but are not drop-in replacements due to differences in input stage behavior and transient response.
What is the recommended bypass capacitance for the V+ pin of the LT1490CN8#PBF?
Linear's datasheet specifies a 0.01µF ceramic capacitor placed within one inch of the V+ pin. For heavy dynamic loads (e.g., driving >100pF cables), an additional 4.7µF electrolytic capacitor is recommended in parallel to suppress supply rail sag and maintain stability.
LT1490CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.07V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 nA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 40µA (x2 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1490CN8#PBF FAQ
1.How can I place an order for LT1490CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1490CN8#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 LT1490CN8#PBF reliable?
The price and inventory of LT1490CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1490CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1490CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1490CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1490CN8#PBF?
LT1490CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1490CN8#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 LT1490CN8#PBF?
For technical support, including LT1490CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1490CN8#PBF requirements.
6.How does Aetrix verify that LT1490CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1490CN8#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 LT1490CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1490CN8#PBF?
All LT1490CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1490CN8#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 LT1490CN8#PBF part is unused and in its original packaging.
Return procedure for LT1490CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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