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Analog Devices Inc. LT1490ACDD#PBF
- Part No.:
- LT1490ACDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1490ACDD#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,418
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Product details
Overview
LT1490ACDD#PBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail input/output micropower operational amplifier in an 8-lead 3mm × 3mm DFN package. It features 500μV max input offset voltage, 40μA per amplifier supply current, 200kHz gain bandwidth, ±15V common-mode input range extending 44V above V–, and rail-to-rail output swing capable of sourcing/sinking 20mA - enabling precision battery monitoring and sensor conditioning in space-constrained industrial systems.
For engineers reviewing the LT1490ACDD#PBF datasheet, LT1490ACDD#PBF pinout, LT1490ACDD#PBF application, or LT1490ACDD#PBF equivalent, key selection criteria include its Over-The-Top® input stage operation on 2V–44V supplies, reverse-battery protection to 18V, no phase reversal under overvoltage faults, and verified performance across 0°C to 70°C ambient temperature with DFN thermal characteristics (θJA = 160°C/W).
Technical Context
The LT1490ACDD#PBF employs a dual-input-stage architecture (NPN + PNP) enabling continuous high-impedance operation across its full 44V common-mode range - including operation with inputs up to 44V above V– independent of V+. Its internal protection includes 1kΩ series resistors and clamping diodes for fault tolerance down to 15V below V–, eliminating phase reversal under such conditions.
It delivers rail-to-rail output drive (±20mA) while maintaining unity-gain stability and driving capacitive loads up to 10,000pF using optional 0.22μF/150Ω compensation. The device draws only 40μA per amplifier at 3V–44V total supply, with reverse-supply current limited to <1nA at –18V - making it suitable for always-on battery-powered instrumentation where quiescent power and fault resilience are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 44V total - supports single-supply 3V/5V and split-supply ±15V operation without sequencing constraints |
| Input Offset Voltage | 500μV max (0°C to 70°C) - enables sub-mV accuracy in low-level signal amplification |
| Quiescent Current | 40μA per amplifier - allows multi-year battery life in portable sensors and monitors |
| Gain Bandwidth Product | 200kHz - sufficient for DC–10kHz sensor signal conditioning and active filter design |
| Output Drive | ±20mA rail-to-rail - directly interfaces with ADC references, LED drivers, or 4–20mA transmitters |
| Common-Mode Range | Extends 44V above V–, independent of V+ - enables direct high-side current sensing in automotive/battery systems |
| Reverse Supply Protection | Withstands –18V reverse bias with <1nA leakage - eliminates need for external blocking diodes |
Pinout & Package
LT1490ACDD#PBF uses an 8-lead plastic DFN package (3mm × 3mm × 0.8mm) with underside metal pad connected to V– for thermal and electrical integrity. The exposed pad must be soldered to PCB ground plane for optimal θJA = 160°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Inverting amplifier output A - rail-to-rail swing, ±20mA drive capability |
| 2 | –IN A | Inverting input A - high-impedance node with Over-The-Top® operation up to 44V above V– |
| 3 | +IN A | Non-inverting input A - same Over-The-Top® range and fault protection as –IN A |
| 4 | V– | Negative supply terminal - connects to exposed underside metal pad for thermal management |
| 5 | V+ | Positive supply terminal - requires local 0.01μF bypass capacitor within 25mm |
| 6 | OUT B | Inverting amplifier output B - electrically identical to OUT A, fully independent channel |
| 7 | –IN B | Inverting input B - matched performance and protection to –IN A |
| 8 | +IN B | Non-inverting input B - matched performance and protection to +IN A |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Operates with inputs 44V above V– regardless of V+, enabling direct high-side sensing without level-shifting |
| Rail-to-Rail Output Swing | Swings within 10mV of V– and 25mV of V+ at 5mA load - maximizes dynamic range in low-voltage systems |
| Reverse Battery Protection | Draws <1nA at –18V reverse supply - eliminates external protection components in automotive/battery applications |
| No Phase Reversal | Guaranteed under input faults 15V below V– or 44V above V– - prevents system latch-up in fault conditions |
| Capacitive Load Drive | Stable with ≥200pF; drives up to 10,000pF using 0.22μF + 150Ω external compensation network |
Applications
| Battery Voltage Monitoring | High-Side Current Sensing |
|---|---|
Use Scenario: Real-time monitoring of 12V lead-acid or 48V Li-ion battery packs in UPS, solar charge controllers, and portable medical devices. IC Role / Device Role / Timing Role: Precision differential amplifier measuring cell voltage against reference, rejecting common-mode ripple and noise. Use Value: 500μV offset and 98dB CMRR ensure ±1mV measurement accuracy over temperature, enabling reliable state-of-charge estimation. | Use Scenario: Measuring motor or load current in industrial PLC I/O modules and EV battery management systems. IC Role / Device Role / Timing Role: High-side current sense amplifier with V– referenced output, interfacing to isolated ADC or microcontroller. Use Value: 44V-over-V– input range allows direct connection to shunt resistor on high-side rail without level shifters or optocouplers. |
| Portable Sensor Signal Conditioning | Micropower Active Filters |
Use Scenario: Amplifying low-amplitude signals from thermistors, strain gauges, or pH electrodes in handheld test equipment and environmental sensors. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail instrumentation amplifier front-end with programmable gain and offset correction. Use Value: 40μA/quiescent current and 1μVP-P 0.1–10Hz noise enable >5-year battery life while preserving signal fidelity. | Use Scenario: Implementing anti-aliasing or tone-shaping filters in battery-powered audio recorders, IoT edge nodes, and wearable health monitors. IC Role / Device Role / Timing Role: Unity-gain stable 2nd-order Sallen-Key or multiple-feedback filter stage with precise cutoff control. Use Value: 200kHz GBW and 0.035V/μs slew rate support accurate 10kHz filter response with minimal distortion in single-supply configurations. |
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 |
|---|---|---|---|
| MAX4475ASA+ | Higher 125μA supply current; 10μV offset; 3MHz GBW; SO-8 only | Better DC precision but higher power; unsuitable for ultra-low-power designs | Select when sub-μV offset and faster settling outweigh battery life requirements |
| OPA2333AIDR | Zero-drift architecture; 2μV offset; 350kHz GBW; 17μA per amp; SO-8/MSOP-8 | Superior long-term drift stability but lacks Over-The-Top® input range and reverse-battery protection | Select for high-accuracy DC measurements where input voltage stays within rails |
Compared with MAX4475ASA+ and OPA2333AIDR, the LT1490ACDD#PBF uniquely combines micropower operation (40μA), Over-The-Top® input capability (44V above V–), and reverse-battery resilience (–18V) in a space-saving DFN - making it irreplaceable for high-side sensing in battery-critical systems where layout area and fault tolerance are non-negotiable.
Availability
LT1490ACDD#PBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, portable instrumentation, and micropower active filter designs requiring stable component supply across industrial and embedded OEM programs.
Supply support for LT1490ACDD#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 its legacy of high-performance analog ICs for precision signal conditioning, power management, and timing applications.
The LT1490A product line was designed specifically for micropower, high-voltage-tolerant operational amplification in battery-powered and automotive systems - emphasizing fault resilience, rail-to-rail operation, and minimal board space.
FAQ
What is the maximum common-mode input voltage range for LT1490ACDD#PBF?
The LT1490ACDD#PBF supports a common-mode input voltage range extending 44V above V–, independent of V+, and down to V– itself. This Over-The-Top® capability allows direct interface with high-side shunts or battery terminals without level-shifting circuitry - confirmed in the datasheet's Absolute Maximum Ratings and Typical Performance curves.
Does LT1490ACDD#PBF require external compensation for driving capacitive loads?
LT1490ACDD#PBF is internally compensated for loads ≤200pF. For capacitive loads exceeding 200pF - up to 10,000pF - external compensation using a 0.22μF capacitor in series with a 150Ω resistor between output and ground is required and validated in the datasheet's Applications Information section.
What is the guaranteed operating temperature range for LT1490ACDD#PBF?
The LT1490ACDD#PBF is specified for operation from 0°C to 70°C ambient temperature. This grade ('C' suffix) is tested and guaranteed across that range, distinct from the 'I' (–40°C to 85°C) and 'H' (–40°C to 125°C) variants - as explicitly stated in the Order Information table.
How does LT1490ACDD#PBF handle reverse battery connection?
LT1490ACDD#PBF provides reverse battery protection up to –18V, drawing less than 1nA supply current under that condition. This eliminates the need for external series diodes in automotive or portable battery systems - a feature verified in the Absolute Maximum Ratings and Applications Information sections.
Can LT1490ACDD#PBF drive a 10kΩ load rail-to-rail at 5V supply?
Yes. At VS = 5V, LT1490ACDD#PBF delivers VOH ≥4.95V (no load) and ≥4.30V at ISOURCE = 10mA, and VOL ≤10mV (no load) and ≤500mV at ISINK = 10mA - confirming true rail-to-rail swing into 10kΩ loads. These values are specified in the Electrical Characteristics tables for the 'C' grade at 25°C and over temperature.
LT1490ACDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-WFDFN Exposed Pad
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT1490ACDD#PBF FAQ
1.How can I place an order for LT1490ACDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1490ACDD#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 LT1490ACDD#PBF reliable?
The price and inventory of LT1490ACDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1490ACDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1490ACDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1490ACDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1490ACDD#PBF?
LT1490ACDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1490ACDD#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 LT1490ACDD#PBF?
For technical support, including LT1490ACDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1490ACDD#PBF requirements.
6.How does Aetrix verify that LT1490ACDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1490ACDD#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 LT1490ACDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1490ACDD#PBF?
All LT1490ACDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1490ACDD#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 LT1490ACDD#PBF part is unused and in its original packaging.
Return procedure for LT1490ACDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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