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Analog Devices Inc. LT1490ACDD#TRPBF
- Part No.:
- LT1490ACDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1490ACDD#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,994
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Product details
Overview
LT1490ACDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual micropower rail-to-rail input/output operational amplifier optimized for battery- and solar-powered systems. It features 500 μV max input offset voltage, 40 μA per amplifier quiescent current, 2 V to 44 V total supply range, rail-to-rail output swing to within 10 mV of V–, and Over-The-Top® input operation up to 44 V above V– - enabling direct sensing in high-side current monitoring applications.
For engineers reviewing the LT1490ACDD#TRPBF datasheet, LT1490ACDD#TRPBF pinout, LT1490ACDD#TRPBF application, or LT1490ACDD#TRPBF equivalent, key selection criteria include its reverse-battery protection (18 V), 20 mA output drive capability, 200 kHz gain bandwidth, no phase reversal under overvoltage conditions, and compatibility with capacitive loads up to 10,000 pF using optional compensation.
Technical Context
The LT1490ACDD#TRPBF employs a unique dual-input-stage architecture (NPN + PNP) that enables continuous high-impedance operation across its full common-mode range - including 44 V above V– independent of V+. Input protection includes built-in 1 kΩ series resistors and clamping diodes to V–, allowing fault tolerance down to 15 V below V– without phase reversal.
Its rail-to-rail output stage delivers ±20 mA while maintaining low saturation voltage (≤450 mV at 2.5 mA sink), and internal compensation ensures stability with ≥200 pF load capacitance; optional 0.22 μF + 150 Ω network extends stable operation to 10,000 pF. Unity-gain stability is guaranteed across all supply voltages (3 V, 5 V, ±15 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 500 μV max (ensures <1 mV error in precision 12-bit ADC front-ends at unity gain) |
| Supply Current per Amp | 40 μA (enables >1-year battery life in coin-cell-powered sensor nodes) |
| Total Supply Range | 2 V to 44 V (supports single Li-ion, multi-cell battery stacks, and industrial 24 V rails) |
| Output Drive | 20 mA (directly drives LED indicators, MOSFET gates, or 50 Ω transmission lines) |
| Gain Bandwidth Product | 200 kHz (sufficient for anti-aliasing filters, active RC stages, and slow-loop control) |
| CM Input Range | Extends 44 V above V– (enables high-side current sensing without level-shifting) |
| Reverse Supply Protection | 18 V (survives accidental battery reversal in automotive/industrial installations) |
Pinout & Package
LT1490ACDD#TRPBF is housed in an 8-lead 3 mm × 3 mm × 0.8 mm plastic DFN package with exposed metal pad connected to V– for thermal and electrical performance. The package is RoHS-compliant, lead-free, and optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT A | Amplifier A output | Capable of sourcing/sinking 20 mA; rail-to-rail swing; connects directly to ADC input or transducer load |
| 2 - –IN A | Inverting input A | Protected to –15 V below V–; no phase reversal; high-Z over full CM range |
| 3 - +IN A | Non-inverting input A | Same protection and Over-The-Top® operation as –IN A; used for high-side sensing reference |
| 4 - V– | Negative supply / ground reference | Exposed metal pad on underside is electrically and thermally tied to this pin |
| 5 - V+ | Positive supply | Bypass with 0.01 μF near pin; supports up to 44 V differential with V– |
| 6 - OUT B | Amplifier B output | Independent output; identical specs to OUT A; enables dual-channel signal conditioning |
| 7 - –IN B | Inverting input B | Functionally identical to –IN A; fully isolated from Channel A |
| 8 - +IN B | Non-inverting input B | Functionally identical to +IN A; supports independent second sensing path |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-supply utilization in low-voltage (3 V) systems and eliminates need for level-shifting circuitry |
| Over-The-Top® input stage | Allows inputs to operate 44 V above V– regardless of V+, critical for high-side current sensing in 24 V/48 V systems |
| Reverse battery protection | Draws <1 nA during –18 V reverse supply, preventing damage and system latch-up in field-replaceable battery modules |
| No phase reversal | Guaranteed operation without output inversion when inputs exceed V– by 15 V or V+ by 44 V - essential for safety-critical monitoring |
| Capacitive load drive | Stable with ≥200 pF directly; optional RC network extends stability to 10,000 pF for long-line or filter-capacitor interfacing |
Applications
| Battery Monitoring | High-Side Current Sensing |
|---|---|
Use Scenario: Real-time voltage tracking and state-of-charge estimation in Li-ion battery packs for portable medical devices. IC Role / Device Role / Timing Role: Dual op amp configured as precision differential amplifier and buffer for cell voltage measurement. Use Value: 500 μV offset and rail-to-rail I/O enable accurate sub-10 mV resolution at 3.0–4.2 V range without external calibration. | Use Scenario: Monitoring motor or solenoid current in 24 V industrial PLC outputs using shunt resistor on high-side. IC Role / Device Role / Timing Role: Single amplifier configured as difference amplifier with Over-The-Top® inputs referenced to 24 V rail. Use Value: Direct sensing at 24 V common-mode eliminates isolation components and reduces BOM cost by >30% vs optocoupler-based solutions. |
| Portable Sensor Signal Conditioning | Micropower Active Filters |
Use Scenario: Amplifying low-level thermistor or bridge-sensor outputs in handheld environmental meters powered by CR2032. IC Role / Device Role / Timing Role: Dual amplifier used for programmable-gain instrumentation and low-pass filtering. Use Value: 40 μA per amplifier allows >2-year operation on 220 mAh coin cell while maintaining 12-bit effective resolution. | Use Scenario: Implementing 2nd-order low-pass filtering in battery-operated gas detectors to suppress RF interference. IC Role / Device Role / Timing Role: One amplifier as unity-gain Sallen-Key stage; second as buffer driving ADC input. Use Value: 200 kHz GBW and rail-to-rail output ensure clean 10 kHz cutoff with <0.1% passband ripple and minimal power overhead. |
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 |
|---|---|---|---|
| MAX4470ASA+ | Lower quiescent current (1.2 μA), but only 100 kHz GBW and 10 mA output drive; not Over-The-Top® capable | Suitable for ultra-low-power wake-up circuits, but cannot replace LT1490ACDD#TRPBF in high-side sensing or 20 mA load drive | Select MAX4470ASA+ only when sub-μA supply current dominates design priority and CM range ≤5 V |
| OPA2333AIDR | Zero-drift architecture (0.02 μV/°C drift), but limited CM range (V– to V+ – 0.1 V); no reverse supply protection | Preferred for precision DC-coupled instrumentation where offset drift matters more than high-voltage tolerance | Choose OPA2333AIDR when long-term DC accuracy outweighs Over-The-Top® operation and reverse-battery robustness |
Compared with MAX4470ASA+ and OPA2333AIDR, the LT1490ACDD#TRPBF uniquely combines wide supply range (2–44 V), Over-The-Top® input capability, reverse-battery survival, and 20 mA drive - making it irreplaceable in ruggedized, high-common-mode industrial sensing where other dual micropower op amps fail.
Availability
LT1490ACDD#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, and portable sensor signal conditioning requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1490ACDD#TRPBF 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, documentation, and manufacturing continuity for the LT1490A family.
The LT1490A product line was designed specifically for micropower, high-voltage-tolerant analog signal conditioning in energy-constrained and electrically harsh environments - especially battery-powered instrumentation and industrial control systems.
FAQ
What is the maximum common-mode input voltage for LT1490ACDD#TRPBF?
The LT1490ACDD#TRPBF supports a common-mode input voltage extending up to 44 V above V–, independent of V+, due to its Over-The-Top® input architecture. This allows direct connection to high-side shunt resistors in 24 V or 48 V systems without level-shifting circuitry. The specification is guaranteed across the full operating temperature range (0°C to 70°C) and applies to both input terminals.
Does LT1490ACDD#TRPBF require external compensation for driving capacitive loads?
The LT1490ACDD#TRPBF is internally compensated and stable with ≥200 pF capacitive load. For loads exceeding 200 pF - such as long PCB traces or filter capacitors - an external 0.22 μF capacitor in series with a 150 Ω resistor between output and ground restores stability up to 10,000 pF. This configuration is validated in the LT1490A/LT1491A datasheet Figure TA04.
What is the guaranteed input offset voltage for LT1490ACDD#TRPBF at room temperature?
The LT1490ACDD#TRPBF has a guaranteed maximum input offset voltage of 500 μV at 25°C and across the 0°C to 70°C operating temperature range. This value is specified for the DD package variant in the AC grade and is measured under standard test conditions (VS = 3V or 5V, VCM = VOUT = half-supply). Typical performance is 110 μV.
Can LT1490ACDD#TRPBF operate with a single 3V supply?
Yes, the LT1490ACDD#TRPBF operates fully specified on a single 3V supply (V+ = 3V, V– = 0V). Its rail-to-rail input and output stages allow signals from 0 V to 3 V, and its Over-The-Top® input enables common-mode voltages up to 44 V above V– (i.e., up to 44 V) - making it ideal for high-side sensing even at low supply voltages.
Is LT1490ACDD#TRPBF pin-compatible with other LT1490A package variants?
Yes, the LT1490ACDD#TRPBF shares identical pinout and function with other LT1490A dual op amp variants in MS8, SO-8, and PDIP-8 packages. Pin 1 is OUT A, Pin 2 is –IN A, Pin 3 is +IN A, Pin 4 is V–, Pin 5 is V+, Pin 6 is OUT B, Pin 7 is –IN B, and Pin 8 is +IN B - consistent across all LT1490A package types including the DD DFN.
LT1490ACDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1490ACDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1490ACDD#TRPBF 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#TRPBF reliable?
The price and inventory of LT1490ACDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1490ACDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1490ACDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1490ACDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1490ACDD#TRPBF?
LT1490ACDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1490ACDD#TRPBF 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#TRPBF?
For technical support, including LT1490ACDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1490ACDD#TRPBF requirements.
6.How does Aetrix verify that LT1490ACDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1490ACDD#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1490ACDD#TRPBF?
All LT1490ACDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1490ACDD#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1490ACDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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