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Analog Devices Inc. LT1490AIN8#PBF
- Part No.:
- LT1490AIN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1490AIN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:159
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Product details
Overview
LT1490AIN8#PBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail input/output micropower operational amplifier in an 8-lead PDIP package, featuring 500 μV max input offset voltage, 40 μA per amplifier quiescent current, and operation from 2 V to 44 V total supply. Its Over-The-Top® input stage accepts common-mode voltages up to 44 V above V– independent of V+, enabling direct battery monitoring in automotive and industrial power systems.
For engineers reviewing the LT1490AIN8#PBF datasheet, LT1490AIN8#PBF pinout, LT1490AIN8#PBF application, or LT1490AIN8#PBF equivalent, key selection criteria include its reverse-battery protection to 18 V, rail-to-rail output swing driving ±20 mA, unity-gain stability with optional 10,000 pF capacitive load compensation, and guaranteed –40°C to +85°C performance across single- and split-supply configurations.
Technical Context
The LT1490AIN8#PBF employs a dual-input-stage architecture (NPN/PNP) that enables continuous high-impedance operation across its full 44 V over-the-top common-mode range - including operation with inputs > V+ - while avoiding phase reversal for inputs 15 V below V– or 44 V above V–. Built-in 1 kΩ series resistors and clamping diodes protect inputs against faults down to 15 V below V–.
It delivers rail-to-rail output swing (e.g., 2.95 V high / 250 mV low at 3 V supply, 5 mA sink/source) with 200 kHz gain-bandwidth product and 0.035 V/μs slew rate. Internal compensation ensures unity-gain stability; external 0.22 μF + 150 Ω network extends stable capacitive load drive to 10,000 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 44 V total - supports single-cell LiFePO₄ (2.5 V), 12 V automotive, and ±15 V industrial rails without level-shifting. |
| Input Offset Voltage | 500 μV max (–40°C to +85°C) - enables accurate current sensing and precision signal conditioning without trimming. |
| Quiescent Current | 40 μA per amplifier - allows multi-year battery life in portable instrumentation and remote sensor nodes. |
| Input Common-Mode Range | Extends 44 V above V–, independent of V+ - permits direct high-side battery voltage monitoring in 24 V/48 V systems. |
| Output Drive Capability | ±20 mA rail-to-rail - drives ADC reference buffers, LED indicators, and 4–20 mA transmitter loads directly. |
| Reverse Supply Protection | Withstands –18 V reverse battery - eliminates need for external blocking diodes in automotive ECU power inputs. |
| Gain Bandwidth Product | 200 kHz - sufficient for DC–10 kHz sensor signal conditioning and active filter applications. |
Pinout & Package
LT1490AIN8#PBF uses the 8-lead narrow-body PDIP (N8) package (0.300″ width), with θJA = 130°C/W and operating junction temperature up to 150°C. Lead finish is lead-free (Pb-free) with NiPdAu plating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Inverting amplifier output A - rail-to-rail swing, ±20 mA capable, internally compensated. |
| 2 | –IN A | Inverting input A - high-impedance node with Over-The-Top® operation; protected to –15 V below V–. |
| 3 | +IN A | Non-inverting input A - same Over-The-Top® range and protection as –IN A. |
| 4 | V– | Negative supply rail - underside metal pad (in DFN variants) connected here; reverse-battery fault return path. |
| 5 | V+ | Positive supply rail - bypass with 0.01 μF ceramic capacitor within 25 mm for stability. |
| 6 | OUT B | Inverting amplifier output B - identical specs and drive capability as OUT A. |
| 7 | –IN B | Inverting input B - electrically isolated from Channel A; shares same Over-The-Top® input architecture. |
| 8 | +IN B | Non-inverting input B - fully independent channel with matched offset and bias characteristics. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables high-side sensing without level shifters - inputs operate 44 V above V– even on 3 V supplies. |
| Rail-to-Rail I/O | Output swings within 10 mV of V– and 25 mV of V+ at 5 mA load - maximizes dynamic range in low-voltage systems. |
| Reverse Battery Protection | Draws <1 nA at –18 V reverse supply - eliminates external protection diodes and associated voltage drop/power loss. |
| No Phase Reversal | Guaranteed no output inversion for inputs 15 V below V– or 44 V above V– - critical for fault-tolerant power monitoring. |
| Capacitive Load Drive | Stable with ≥200 pF; optional 0.22 μF + 150 Ω network extends to 10,000 pF - supports long-cable sensor interfaces. |
Applications
| Battery Voltage Monitoring | Current Sensing in 4–20 mA Transmitters |
|---|---|
|
Use Scenario: Real-time monitoring of 12 V/24 V lead-acid or Li-ion battery packs in automotive ECUs or UPS systems. IC Role / Device Role / Timing Role: Dual op amp configured as high-side differential amplifier and buffer, measuring VBATT relative to ground with Over-The-Top® inputs referenced to V–. Use Value: Eliminates high-voltage dividers and level shifters; achieves ±0.5% accuracy over temperature using 500 μV max VOS. |
Use Scenario: Precision current measurement across shunt resistor in industrial 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Single amplifier used as current-sense amplifier with rail-to-rail output driving DAC or ADC reference. Use Value: 40 μA quiescent current ensures loop compliance; ±20 mA output drives 2.5 V reference buffers without external gain stages. |
| Portable Sensor Signal Conditioning | Micropower Active Filters |
|
Use Scenario: Amplifying low-level thermocouple or bridge sensor outputs in handheld test equipment powered by coin cells. IC Role / Device Role / Timing Role: Dual amplifier implementing instrumentation-grade gain stage and low-pass filter, operating from 3 V supply. Use Value: 200 kHz GBW and 0.035 V/μs slew rate support 10 kHz bandwidth; 40 μA per amp extends battery life beyond 5 years. |
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in battery-operated environmental sensors. IC Role / Device Role / Timing Role: One amplifier as unity-gain buffer, second as active filter integrator - both sharing same 3 V rail. Use Value: Rail-to-rail I/O preserves full 3 V signal swing; internal compensation avoids instability with filter capacitor parasitics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1490ACS8#PBF | Same silicon, SO-8 package (θJA = 190°C/W); 0°C to 70°C temp grade vs. –40°C to 85°C. | Limited to commercial-temperature environments; unsuitable for under-hood automotive or industrial field deployments. | Select only for cost-sensitive, non-extended-temperature board-level designs where PDIP footprint is unavailable. |
| AD8602ARZ | Single-supply rail-to-rail op amp (Analog Devices); 65 μA IQ, 1 mV VOS, 8 MHz GBW - higher speed, higher power, lower precision. | Not Over-The-Top®; common-mode range limited to V– to V+ – 0.1 V - cannot monitor high-side battery voltage directly. | Choose when bandwidth >100 kHz is required and high-side sensing is handled externally; avoid for battery monitor front-ends. |
Compared with LT1490ACS8#PBF and AD8602ARZ, the LT1490AIN8#PBF uniquely combines extended temperature operation, true Over-The-Top® input capability, and ultra-low quiescent current - making it irreplaceable for robust, low-power, high-voltage sensing in harsh environments.
Availability
LT1490AIN8#PBF is available at Aetrix Electronics and suitable for battery monitoring, industrial current sensing, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1490AIN8#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 product support, datasheets, and application engineering for legacy Linear parts including the LT1490A family.
The LT1490A product line was designed specifically for precision, low-power, high-voltage sensing in automotive, industrial, and energy storage systems - emphasizing Over-The-Top® operation, reverse-battery resilience, and rail-to-rail performance at microamp quiescent currents.
FAQ
What is the maximum common-mode input voltage for LT1490AIN8#PBF?
The LT1490AIN8#PBF supports a common-mode input voltage range extending up to 44 V above V–, independent of V+. This Over-The-Top® capability allows direct connection to high-side battery terminals in 24 V or 48 V systems without attenuation or level shifting - a defining feature confirmed in the datasheet's Absolute Maximum Ratings and Applications Information sections.
Does LT1490AIN8#PBF require external compensation for capacitive loads?
The LT1490AIN8#PBF is internally compensated for loads up to 200 pF. For larger capacitive loads - such as long cables or ADC input capacitance - a 0.22 μF capacitor in series with a 150 Ω resistor must be placed between the output and ground. This network stabilizes the LT1490AIN8#PBF up to 10,000 pF, as verified in the Typical Performance Characteristics and Applications Information sections.
Can LT1490AIN8#PBF operate with a single 3V supply?
Yes, the LT1490AIN8#PBF is fully specified and functional on a single 3 V supply (V+ = 3 V, V– = 0 V). It delivers rail-to-rail output swing (e.g., 2.95 V high / 250 mV low at 5 mA), 500 μV max input offset, and 40 μA per amplifier quiescent current - making it ideal for coin-cell or LiFePO₄-powered portable devices.
What is the reverse supply voltage rating of LT1490AIN8#PBF?
The LT1490AIN8#PBF is rated for reverse supply voltage up to –18 V (i.e., V+ < V– by 18 V), drawing less than 1 nA supply current under this condition. This reverse-battery protection eliminates the need for external series diodes in automotive and industrial power inputs - a key reliability feature documented in the Absolute Maximum Ratings and Applications Information sections.
Is LT1490AIN8#PBF pin-compatible with other packages in the LT1490A family?
Yes, the LT1490AIN8#PBF shares identical pinout and electrical functionality with the LT1490A in MSOP (MS8), SO-8 (S8), and DFN (DD) packages. All variants use the same 8-pin configuration: OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B. This allows drop-in replacement across packages when thermal or layout constraints change - confirmed in the Pin Configuration diagrams for N8, MS8, S8, and DD packages.
LT1490AIN8#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:
- 0.06V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 nA
- Voltage - Input Offset:
- 285 µV
- Current - Supply:
- 50µA (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
LT1490AIN8#PBF FAQ
1.How can I place an order for LT1490AIN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1490AIN8#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 LT1490AIN8#PBF reliable?
The price and inventory of LT1490AIN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1490AIN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1490AIN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1490AIN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1490AIN8#PBF?
LT1490AIN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1490AIN8#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 LT1490AIN8#PBF?
For technical support, including LT1490AIN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1490AIN8#PBF requirements.
6.How does Aetrix verify that LT1490AIN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1490AIN8#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 LT1490AIN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1490AIN8#PBF?
All LT1490AIN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1490AIN8#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 LT1490AIN8#PBF part is unused and in its original packaging.
Return procedure for LT1490AIN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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