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Analog Devices Inc. LT1491ACN#PBF
- Part No.:
- LT1491ACN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1491ACN#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:163
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Product details
Overview
LT1491ACN#PBF from Analog Devices (formerly Linear Technology) is a quad 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 supply current, 2 V to 44 V total supply range, reverse supply protection up to 18 V, and rail-to-rail output swing capable of sourcing/sinking 20 mA - enabling precision current sensing in portable instrumentation.
For engineers reviewing the LT1491ACN#PBF datasheet, LT1491ACN#PBF pinout, LT1491ACN#PBF application, or LT1491ACN#PBF equivalent, key selection criteria include its Over-The-Top® input common-mode range extending 44 V above V– independent of V+, no phase reversal under ±15 V input overdrive, unity-gain stability, and compatibility with capacitive loads up to 10,000 pF using optional 0.22 μF/150 Ω compensation.
Technical Context
The LT1491ACN#PBF employs a dual-input-stage architecture (NPN + PNP) enabling operation with inputs up to 44 V above V– and 15 V below V– without phase reversal. Its Over-The-Top® input stage remains high-impedance even when biased above V+, supporting wide common-mode monitoring in high-side current sensing and battery monitor circuits.
Internally compensated for unity-gain stability, it drives heavy resistive loads (20 mA) and large capacitive loads (up to 10,000 pF with external RC network). The device draws only 40 μA per amplifier at 25°C and maintains rail-to-rail output swing down to 10 mV from either rail under light load, with CMRR of 98 dB and PSRR of 98 dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 44 V total - supports single-supply 3 V/5 V and split ±15 V operation without level-shifting. |
| Input Offset Voltage | 500 μV max (–40°C to 85°C) - enables accurate low-level signal amplification in sensor conditioning. |
| Quiescent Current | 40 μA per amplifier - ensures multi-year battery life in always-on portable instrumentation. |
| Output Drive | ±20 mA - directly interfaces with 4–20 mA transmitter loads and active filters without external buffers. |
| Gain Bandwidth Product | 200 kHz - sufficient for DC–10 kHz signal chains in supply current sensing and battery monitoring. |
| Common-Mode Range | Extends 44 V above V–, independent of V+ - allows high-side sensing in 24 V industrial buses or 48 V telecom systems. |
| Reverse Supply Protection | Withstands –18 V on V+ or V– - eliminates need for external diode protection in automotive battery interfaces. |
Pinout & Package
LT1491ACN#PBF is housed in a 14-lead plastic PDIP (N package) with JEDEC standard footprint and 0.300-inch body width. Thermal resistance θJA = 110°C/W. Underside metal not exposed; leads are tin-lead (Pb-free finish per #PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - rail-to-rail swing, capable of ±20 mA drive into resistive or capacitive loads. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node with Over-The-Top® capability up to 44 V above V–. |
| 3 | +IN A | Non-inverting input of Amp A - same Over-The-Top® range and internal 1 kΩ series fault protection. |
| 4 | V+ | Positive supply pin - bypass with 0.01 μF capacitor within 1 inch; supports reverse-battery protection. |
| 5 | +IN B | Non-inverting input of Amp B - electrically identical to Pin 3; enables dual-channel differential sensing. |
| 6 | –IN B | Inverting input of Amp B - matched performance to Pin 2; used for second independent gain stage. |
| 7 | OUT B | Amplifier B output - fully independent channel; shares same rail-to-rail output architecture as Pin 1. |
| 8 | NC | No connect - unused pad; must remain unconnected per datasheet layout guidance. |
| 9 | OUT D | Amplifier D output - fourth independent rail-to-rail output; enables quad-channel signal conditioning. |
| 10 | –IN D | Inverting input of Amp D - matches Pin 2/6 specifications; supports high-common-mode voltage sensing. |
| 11 | +IN D | Non-inverting input of Amp D - identical Over-The-Top® behavior; used in 4–20 mA loop transmitters. |
| 12 | V– | Negative supply pin - referenced for all outputs and inputs; underside metal connected to V– in DFN variants (not applicable here). |
| 13 | +IN C | Non-inverting input of Amp C - third channel input; enables simultaneous monitoring of multiple battery cells. |
| 14 | –IN C | Inverting input of Amp C - matched to other inputs; used with external resistors for precision gain setting. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables direct high-side current sensing without level shifters - inputs operate 44 V above V– regardless of V+. |
| Rail-to-Rail I/O | Output swings within 10 mV of V– and 250 mV of V+ at 5 mA sink/source - maximizes dynamic range in low-voltage systems. |
| No Phase Reversal | Guaranteed operation with inputs 15 V below V– or 44 V above V– - prevents latch-up in fault conditions. |
| Reverse Supply Protection | Draws <1 nA at –18 V reverse bias - eliminates external protection diodes in battery backup circuits. |
| Capacitive Load Drive | Stable with ≥10,000 pF using 0.22 μF + 150 Ω compensation - supports long-cable sensor interfacing. |
| Micropower Operation | 40 μA per amplifier at 25°C - enables integration into energy-harvesting nodes with sub-200 μA system budgets. |
Applications
| Battery Monitoring | Supply Current Sensing |
|---|---|
|
Use Scenario: Real-time monitoring of 12 V lead-acid or 48 V Li-ion battery packs in UPS and telecom systems. IC Role / Device Role / Timing Role: Quad op amp configured as four independent high-side current sensors using shunt resistors and Over-The-Top® inputs. Use Value: Enables simultaneous cell-voltage and charge/discharge current measurement with <500 μV offset error across –40°C to 85°C. |
Use Scenario: Precision measurement of microcontroller supply current during sleep/wake transitions in IoT edge nodes. IC Role / Device Role / Timing Role: One amplifier configured as a transimpedance amplifier for a 100 mΩ sense resistor; others buffer reference and filter signals. Use Value: Delivers 40 μA quiescent current contribution while maintaining 200 kHz bandwidth for transient current capture. |
| Sensor Conditioning | 4–20 mA Transmitter |
|
Use Scenario: Signal conditioning for low-output piezoresistive pressure sensors in portable medical devices. IC Role / Device Role / Timing Role: Dual amplifiers provide gain and offset adjustment; third implements active low-pass filtering; fourth drives ADC reference. Use Value: Rail-to-rail I/O preserves full sensor dynamic range across 3 V battery supply; 98 dB CMRR rejects EMI in noisy clinical environments. |
Use Scenario: Industrial process control loop transmitter converting 0–5 V sensor output to 4–20 mA current output. IC Role / Device Role / Timing Role: Three amplifiers implement voltage-to-current conversion, loop power regulation, and feedback sensing; fourth provides diagnostics. Use Value: ±20 mA output drive directly sources loop current without external transistor; reverse supply protection guards against wiring faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1491AIS#PBF | Same silicon, SO-14 package with –40°C to 85°C temp grade (vs. LT1491ACN#PBF's 0°C to 70°C grade). | Required for extended temperature industrial deployments where ambient exceeds 70°C. | Select LT1491AIS#PBF when operating beyond 70°C ambient; otherwise LT1491ACN#PBF offers cost-optimized PDIP for lab/prototype use. |
| AD8602ARZ | Lower offset (65 μV typ), higher GBW (8.5 MHz), but only 2-channel, no Over-The-Top® input, and 1 mA IQ. | Suitable for precision low-frequency instrumentation where high common-mode range is unnecessary. | Choose AD8602ARZ for ultra-low-offset dual-channel needs; avoid when >44 V common-mode or quad-channel density is required. |
Compared with LT1491AIS#PBF, LT1491ACN#PBF trades extended temperature rating for lower cost and through-hole assembly compatibility; versus AD8602ARZ, it delivers unique Over-The-Top® operation and quad-channel integration at the expense of bandwidth and offset precision.
Availability
LT1491ACN#PBF is available at Aetrix Electronics and suitable for battery monitoring, portable instrumentation, and 4–20 mA transmitter designs requiring stable component supply across prototyping, NPI, and volume production phases.
Supply support for LT1491ACN#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, Inc. (ADI) acquired Linear Technology in 2017 and maintains its precision analog portfolio, including rail-to-rail op amps, voltage references, and power management ICs.
The LT1491A belongs to Linear Technology's Over-The-Top® op amp family, designed specifically for high-common-mode-voltage signal conditioning in battery-powered, automotive, and industrial monitoring systems.
FAQ
What is the maximum common-mode input voltage range for LT1491ACN#PBF?
The LT1491ACN#PBF supports an input common-mode range extending 44 V above V–, independent of V+. This Over-The-Top® capability allows direct high-side sensing in 24 V or 48 V systems without level-shifting circuitry. For example, with V– = 0 V and V+ = 5 V, inputs may safely reach +44 V - confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
Does LT1491ACN#PBF require external compensation for driving capacitive loads?
LT1491ACN#PBF is internally compensated for unity-gain stability and drives ≥200 pF capacitively without external components. For loads exceeding 200 pF - such as long cables or ADC input capacitance - a 0.22 μF capacitor in series with a 150 Ω resistor between output and ground extends stable operation up to 10,000 pF, as verified in the Applications Information section.
What is the guaranteed input offset voltage specification for LT1491ACN#PBF over temperature?
LT1491ACN#PBF guarantees a maximum input offset voltage of 500 μV over the 0°C to 70°C operating temperature range. At –40°C to 85°C, the limit increases to 800 μV for PDIP/SO packages. These values are explicitly listed in the Electrical Characteristics table under "LT1490AC/LT1491AC" conditions with "–40°C ≤ TA ≤ 85°C" test rows.
Can LT1491ACN#PBF operate with a single 3 V supply?
Yes, LT1491ACN#PBF operates with a minimum total supply voltage of 2 V, making it fully functional on a single 3 V supply. Its rail-to-rail inputs accept signals from V– to V+, and its output swings to within 10 mV of V– and 250 mV of V+ at 5 mA load - validated in the Electrical Characteristics table for VS = 3 V, 0 V conditions.
Is LT1491ACN#PBF pin-compatible with other LT149x op amps?
LT1491ACN#PBF is pin-compatible with all LT1491A variants in the 14-lead PDIP (N) and SO (S) packages, including LT1491AIN#PBF and LT1491AHS#PBF. Pin assignments match exactly per the Pin Configuration diagrams on page 2 of the datasheet; only temperature grade and packaging differ - no PCB redesign is needed when upgrading grade.
LT1491ACN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LT1491ACN#PBF FAQ
1.How can I place an order for LT1491ACN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1491ACN#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 LT1491ACN#PBF reliable?
The price and inventory of LT1491ACN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1491ACN#PBF is usually 5 days.
3.What payment methods are accepted for LT1491ACN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1491ACN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1491ACN#PBF?
LT1491ACN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1491ACN#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 LT1491ACN#PBF?
For technical support, including LT1491ACN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1491ACN#PBF requirements.
6.How does Aetrix verify that LT1491ACN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1491ACN#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 LT1491ACN#PBF meets industry standards.
7.What is the process for return or replacement of LT1491ACN#PBF?
All LT1491ACN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1491ACN#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 LT1491ACN#PBF part is unused and in its original packaging.
Return procedure for LT1491ACN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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