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Analog Devices Inc. LT1490IN8#PBF
- Part No.:
- LT1490IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1490IN8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
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Product details
Overview
LT1490IN8#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 ≤50µA per amplifier, delivers ±20mA output current, supports input common-mode range from –0.4V to 44V, and is specified over –40°C to 85°C for battery monitoring and sensor conditioning applications.
For engineers reviewing the LT1490IN8#PBF datasheet, LT1490IN8#PBF pinout, LT1490IN8#PBF application, or LT1490IN8#PBF equivalent, key selection criteria include its reverse-battery protection to 18V, rail-to-rail swing with 250mV low-side saturation at 5mA sink, 98dB CMRR, 200kHz gain-bandwidth product, and ability to drive 10,000pF capacitive loads with optional compensation.
Technical Context
The LT1490IN8#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 behavior across the full common-mode range. Its unique input design eliminates phase reversal for inputs 22V below V– or 44V above V–, independent of V+.
This op amp is internally compensated for unity-gain stability and drives ≥200pF capacitively without external components; optional 0.22µF + 150Ω network extends stable operation to 10,000pF. It features built-in reverse-supply protection (≤1nA current at –18V) and no supply sequencing requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 44V total - enables single-supply operation down to 2V or high-voltage split supplies up to ±22V. |
| Quiescent Current | ≤50µA per amplifier - supports multi-year battery life in portable instrumentation and remote sensors. |
| Input Common-Mode Range | –0.4V to 44V - allows direct sensing of signals referenced to ground or above positive rail in 3V/5V systems. |
| Output Drive Capability | ±20mA - sufficient to directly interface with ADC reference buffers, LED drivers, or 4–20mA loop transmitters. |
| Gain Bandwidth Product | 200kHz - supports precision DC-coupled signal conditioning and low-frequency active filtering up to ~100kHz. |
| CMRR | 98dB - rejects power supply noise and common-mode interference in noisy industrial environments. |
| Reverse Battery Protection | Up to –18V - prevents damage and leakage during incorrect battery insertion in automotive or portable equipment. |
Pinout & Package
LT1490IN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300-inch body width, through-hole mounting, and industry-standard pin spacing. Pin 1 is marked by a notch or dot; leads are tin-lead plated for compatibility with standard wave-solder processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A | High-impedance differential input node for amplifier A; accepts common-mode voltages up to 44V above V–. |
| 2 | Non-Inverting Input A | High-impedance differential input node for amplifier A; supports rail-to-rail input operation including beyond V+. |
| 3 | Output A | Rail-to-rail output capable of sourcing/sinking ±20mA; drives capacitive loads up to 10,000pF with compensation. |
| 4 | V– (Negative Supply) | Reference terminal for negative supply rail; internal protection diodes limit fault current to <100mA transiently. |
| 5 | Non-Inverting Input B | High-impedance differential input node for amplifier B; identical electrical characteristics to Pin 2. |
| 6 | Inverting Input B | High-impedance differential input node for amplifier B; identical electrical characteristics to Pin 1. |
| 7 | Output B | Rail-to-rail output for amplifier B; electrically isolated from Output A; shares same drive strength and compensation capability. |
| 8 | V+ (Positive Supply) | Power input for positive supply rail; requires local 0.01µF bypass capacitor within 1 inch for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage (3V/5V) single-supply systems without level-shifting circuitry. |
| Reverse supply protection | Draws <1nA at –18V reverse bias - eliminates need for external series diode in battery-powered designs. |
| No phase reversal | Guaranteed over –22V to +44V input range relative to V– - ensures predictable behavior during overvoltage transients. |
| Capacitive load drive | Stable with up to 10,000pF using 0.22µF + 150Ω compensation - simplifies interfacing to long cables or ADC input filters. |
| Micropower operation | 50µA/amplifier max at full temperature range - reduces thermal drift and enables ultra-low-power sleep modes. |
Applications
| Battery Monitoring | Sensor Signal Conditioning |
|---|---|
Use Scenario: Real-time measurement of 12V lead-acid or lithium-ion battery voltage and current in portable medical devices or UPS systems. IC Role / Device Role / Timing Role: Dual op amp configured as differential current-sense amplifier and rail-to-rail voltage monitor with reverse-polarity protection. Use Value: Enables accurate state-of-charge estimation over full battery voltage range (0–14.4V) while surviving accidental reverse connection up to –18V. | Use Scenario: Amplification and offset adjustment of millivolt-level outputs from thermocouples, strain gauges, or pressure transducers in industrial IoT nodes. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with rail-to-rail input/output and low 50µA quiescent current. Use Value: Maintains >98dB CMRR across –40°C to 85°C, rejecting EMI and supply noise without compromising battery life. |
| 4–20mA Transmitter | Micropower Active Filter |
Use Scenario: Two-wire loop-powered transmitter converting sensor voltage to standardized 4–20mA current output for PLC interfaces. IC Role / Device Role / Timing Role: Dual op amp implementing voltage-to-current conversion and loop regulation with integrated reverse-polarity protection. Use Value: Operates from 12–44V loop supply, draws <100µA total, and withstands field wiring faults including reversed polarity. | Use Scenario: Low-pass or band-pass filtering of analog sensor data in energy-harvesting wireless sensor nodes. IC Role / Device Role / Timing Role: Unity-gain stable op amp configured in Sallen-Key topology with 200kHz GBW and rail-to-rail output swing. Use Value: Achieves <0.1% THD+N at 1kHz while consuming only 50µA - extends usable runtime on coin-cell or solar-charged batteries. |
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 |
|---|---|---|---|
| LT1490IS8#PBF | Same electrical specs but in 8-lead SOIC (S8) package; 150°C/W θJA vs 130°C/W for N8; no lead-forming required. | Better suited for automated SMT assembly and higher-density PCB layouts; slightly lower thermal resistance in still air. | Select when surface-mount manufacturing is preferred and board space is constrained. |
| LT1490CMS8#PBF | Commercial-grade (0°C to 70°C) version in MSOP-8; identical micropower and rail-to-rail performance but narrower temp range. | Targeted at cost-sensitive consumer electronics where extended temperature operation is not required. | Select for non-industrial applications where ambient temperature stays within 0–70°C and MSOP footprint is acceptable. |
Compared with LT1490IS8#PBF and LT1490CMS8#PBF, the LT1490IN8#PBF offers guaranteed –40°C to 85°C operation in through-hole PDIP packaging - ideal for prototyping, legacy board upgrades, and applications requiring mechanical robustness and hand-solderability.
Availability
LT1490IN8#PBF is available at Aetrix Electronics and suitable for battery monitoring, sensor signal conditioning, and 4–20mA transmitter designs requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1490IN8#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 LT1490 family.
The LT1490IN8#PBF belongs to Linear's precision micropower op amp product line, designed specifically for energy-constrained systems requiring rail-to-rail operation, wide supply range, and robust fault tolerance in harsh environments.
FAQ
What is the maximum capacitive load the LT1490IN8#PBF can drive stably?
The LT1490IN8#PBF is internally compensated for stable operation with ≥200pF capacitive loads. With optional external compensation - a 0.22µF capacitor in series with a 150Ω resistor connected between output and ground - it drives capacitive loads up to 10,000pF reliably across all output currents and supply voltages. This capability is confirmed in the datasheet's Typical Performance Characteristics (Figure G21) and Applications Information section.
Does the LT1490IN8#PBF support true rail-to-rail input operation beyond the positive supply rail?
Yes. The LT1490IN8#PBF features a unique dual-input-stage architecture that allows both inputs to operate up to 0.3V above V+ while maintaining high impedance and linear behavior. Its input common-mode range extends to 44V above V–, meaning it functions correctly even when V+ is as low as 3V and inputs reach 44V - a critical feature for high-side current sensing and industrial signal acquisition.
What is the guaranteed operating temperature range for the LT1490IN8#PBF?
The LT1490IN8#PBF is guaranteed to meet all specifications over the industrial temperature range of –40°C to +85°C. This is explicitly stated in the Absolute Maximum Ratings table and Electrical Characteristics sections of the datasheet (Note 3), distinguishing it from commercial-grade variants like LT1490CMS8#PBF (0°C to 70°C).
How does reverse battery protection work on the LT1490IN8#PBF?
The LT1490IN8#PBF incorporates internal reverse-supply protection circuitry that limits supply current to less than 1nA when V+ is reversed to –18V relative to V–. This eliminates the need for external series diodes in battery-powered systems, preserving efficiency and simplifying layout. The protection is effective regardless of input voltage conditions and is verified across the full temperature range.
Can the LT1490IN8#PBF be used in single-supply configurations with ground-referenced inputs?
Yes. The LT1490IN8#PBF is explicitly designed for single-supply operation with input common-mode range extending to –0.4V (i.e., 400mV below ground) and rail-to-rail output swing. When powered from 3V or 5V with V– = 0V, it accurately amplifies signals from ground up to the positive rail - making it ideal for sensor interfaces, supply current sensing, and portable instrumentation where ground is the natural reference.
LT1490IN8#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
LT1490IN8#PBF FAQ
1.How can I place an order for LT1490IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1490IN8#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 LT1490IN8#PBF reliable?
The price and inventory of LT1490IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1490IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1490IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1490IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1490IN8#PBF?
LT1490IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1490IN8#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 LT1490IN8#PBF?
For technical support, including LT1490IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1490IN8#PBF requirements.
6.How does Aetrix verify that LT1490IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1490IN8#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 LT1490IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1490IN8#PBF?
All LT1490IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1490IN8#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 LT1490IN8#PBF part is unused and in its original packaging.
Return procedure for LT1490IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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