My Inquiry
My Account
Analog Devices Inc. LT1491AIDHC#PBF
- Part No.:
- LT1491AIDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT1491AIDHC#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:306
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1491AIDHC#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, 200 kHz gain bandwidth product, ±15 V to 3 V single-supply operation, and Over-The-Top® input stage enabling 44 V common-mode range above V– - used in precision battery monitoring circuits.
For engineers reviewing the LT1491AIDHC#PBF datasheet, LT1491AIDHC#PBF pinout, LT1491AIDHC#PBF application, or LT1491AIDHC#PBF equivalent, key selection criteria include micropower operation under 2 V total supply, reverse-battery protection up to 18 V, rail-to-rail output swing driving 20 mA, no phase reversal with inputs 15 V below V–, and compatibility with capacitive loads up to 10,000 pF using external 0.22 μF/150 Ω compensation.
Technical Context
The LT1491AIDHC#PBF employs a dual-input-stage architecture (NPN + PNP) enabling Over-The-Top® operation: inputs remain functional and high-impedance even when biased 44 V above V–, independent of V+. Built-in 1 kΩ series resistors and clamping diodes protect inputs against faults down to 15 V below V– without phase reversal.
Its rail-to-rail output stage delivers ±20 mA drive capability while maintaining 10 mV typical saturation voltage near rails. Internal compensation ensures unity-gain stability; optional external RC network (0.22 μF + 150 Ω to ground) extends stable capacitive load drive to 10,000 pF - critical for sensor signal conditioning and active filter applications requiring low-noise, low-distortion amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 44 V total; enables direct use in 1-cell Li-ion (2.7–4.2 V), 12 V automotive, and industrial 24 V systems without level-shifting. |
| Quiescent Current | 40 μA per amplifier max; supports multi-year battery life in always-on IoT sensors and portable instrumentation. |
| Input Offset Voltage | 500 μV max (–40°C to 85°C); ensures <±1 mV error in 3 V supply current-sensing shunt amplifiers with 100 mΩ sense resistor. |
| Gain Bandwidth Product | 200 kHz typ; sufficient for anti-aliasing filters, 4–20 mA transmitter loops, and DC-coupled sensor interfaces up to ~20 kHz. |
| Output Drive | 20 mA min into rail; drives ADC reference buffers, LED indicators, and low-side MOSFET gates without external boost. |
| Common-Mode Range | Extends 44 V above V–, independent of V+; allows direct high-side battery voltage monitoring in 36 V EV battery packs using 3.3 V MCU supply. |
| Reverse Supply Protection | 18 V max reverse voltage; draws <1 nA current during accidental battery reversal - eliminates need for external blocking diode. |
Pinout & Package
LT1491AIDHC#PBF is housed in a 16-lead (5 mm × 3 mm) plastic DFN package with underside metal pad connected to V–. Thermal resistance θJA = 160°C/W (Note 2); junction temperature limit is 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | OUT A, –IN A, +IN A, V+ | Amplifier A output, inverting input, non-inverting input, and positive supply - standard op-amp configuration; V+ must be bypassed with 0.01 μF capacitor. |
| 5, 6, 7, 8 | +IN B, –IN B, OUT B, NC | Amplifier B inputs and output; Pin 8 is no-connect - avoid routing signals or traces to this terminal. |
| 9, 10, 11, 12 | OUT C, –IN C, +IN C, V– | Amplifier C output and inputs; V– serves as power return and thermal pad anchor - must be soldered to PCB ground plane for thermal and electrical integrity. |
| 13, 14, 15, 16 | +IN D, –IN D, OUT D, NC | Amplifier D inputs and output; second NC pin (16) provides mechanical symmetry - leave unconnected and unstubbed. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables 44 V input common-mode range above V– on 3 V supply - eliminates level-shifters in high-side current sensing and battery voltage monitoring. |
| Rail-to-Rail Output Swing | Drives within 10 mV of V– and 2.925 V at V+ (3 V supply, 5 mA sink/source) - maximizes dynamic range for low-voltage ADC interfacing. |
| Micropower Operation | 40 μA per amplifier at 3 V supply - reduces system standby power by >90% vs. standard rail-to-rail op-amps (e.g., TLV2464). |
| No Phase Reversal | Guaranteed for inputs 15 V below V– or 44 V above V– - prevents latch-up and erroneous control signals in fault-tolerant power management. |
| Capacitive Load Drive | Stable with ≥200 pF directly; up to 10,000 pF with 0.22 μF + 150 Ω compensation - supports long cable runs and piezoelectric sensor buffering. |
| Reverse Battery Protection | Draws <1 nA at –18 V supply - removes need for series Schottky diode, preserving efficiency in battery-powered portable instruments. |
Applications
| Battery Monitoring | Current Sensing |
|---|---|
|
Use Scenario: Real-time voltage measurement across individual cells in 12 V–48 V lead-acid or LiFePO₄ battery packs with microcontroller-based BMS. IC Role / Device Role / Timing Role: Quad op-amp configured as four independent high-impedance differential amplifiers, each measuring cell voltage referenced to pack ground. Use Value: Over-The-Top® input allows direct connection to top cell without level-shifting; 500 μV offset ensures <±1 mV absolute accuracy over temperature. |
Use Scenario: Bidirectional current sensing in solar charge controllers using low-value shunt resistors (10–100 mΩ) between battery and load. IC Role / Device Role / Timing Role: Precision current-sense amplifier with gain-setting resistors, rejecting common-mode voltage up to 44 V while amplifying mV-level shunt drops. Use Value: Rail-to-rail output swings fully to 0 V and 3.3 V, matching MCU ADC input range; 40 μA quiescent current minimizes self-heating error. |
| Portable Instrumentation | Micropower Active Filters |
|
Use Scenario: Signal conditioning front-end for handheld multimeters and environmental sensors powered by two AA alkaline cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier stage for thermocouple, RTD, or pH electrode signals prior to digitization. Use Value: 1 μVP-P 0.1–10 Hz noise and 98 dB CMRR suppress 50/60 Hz interference; 2 V minimum supply enables operation until battery depletion. |
Use Scenario: 2nd-order Sallen-Key low-pass filter in wireless sensor nodes, limiting bandwidth to 10 kHz before 12-bit SAR ADC sampling. IC Role / Device Role / Timing Role: Unity-gain stable amplifier implementing filter transfer function with external R/C components; drives 1000 pF trace capacitance. Use Value: Internal compensation + optional 0.22 μF/150 Ω network ensures monotonic step response with <5% overshoot - avoids aliasing artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2464IDR | Higher supply current (230 μA/amplifier), lower GBW (650 kHz), no Over-The-Top® input - common-mode limited to V– to V+–1.5 V. | Not suitable for high-side sensing above V+; requires ≥2.7 V supply; better for higher-speed, AC-coupled signal paths. | Select TLV2464IDR only when speed >200 kHz is required and input common-mode stays within rails. |
| OPA2333PWR | Zero-drift architecture (0.02 μV/°C drift), lower offset (10 μV max), but higher quiescent current (17 μA) and narrower supply (1.8–5.5 V). | Superior DC precision for strain gauge bridges and medical ECG front-ends; incompatible with 12 V or 24 V single-supply systems. | Choose OPA2333PWR when sub-μV offset stability is critical and supply is ≤5.5 V; avoid for wide-supply battery monitoring. |
Compared with TLV2464IDR and OPA2333PWR, LT1491AIDHC#PBF uniquely balances ultra-low power (40 μA), wide supply (2–44 V), and Over-The-Top® input capability - making it the only option for precision, low-power, high-common-mode sensing in energy-harvesting and automotive subsystems.
Availability
LT1491AIDHC#PBF is available at Aetrix Electronics and suitable for battery monitoring, current sensing, portable instrumentation, and micropower active filter designs requiring stable component supply across industrial, medical, and IoT production programs.
Supply support for LT1491AIDHC#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 precision analog portfolio, emphasizing high-performance, low-power, and robust signal conditioning ICs for demanding industrial and automotive applications.
The LT1490A/LT1491A family was designed specifically for micropower, wide-supply, rail-to-rail op-amp applications where input common-mode range exceeds supply rails - targeting battery management, energy harvesting, and fault-tolerant power systems.
FAQ
What is the maximum capacitive load the LT1491AIDHC#PBF can drive without external compensation?
The LT1491AIDHC#PBF is internally compensated to drive at least 200 pF of capacitive load under any output loading condition. For loads exceeding 200 pF - such as long PCB traces, cables, or ADC input capacitance - external compensation with a 0.22 μF capacitor and 150 Ω resistor to ground is required to maintain stability up to 10,000 pF. This configuration is validated in the LT1491AIDHC#PBF datasheet Figure 12.
Does the LT1491AIDHC#PBF support true single-supply operation down to 2 V total supply?
Yes, the LT1491AIDHC#PBF is fully specified and functional at 2 V total supply (e.g., V+ = 2 V, V– = 0 V). Its rail-to-rail input and output stages operate across the full supply range, and quiescent current remains at 40 μA max. This enables use in single-cell lithium or alkaline battery systems where voltage drops below 2.5 V during discharge - a key differentiator from many competing quad op-amps.
How does the Over-The-Top® input architecture of the LT1491AIDHC#PBF benefit high-side current sensing?
The Over-The-Top® input allows the LT1491AIDHC#PBF's inputs to operate 44 V above V– regardless of V+, enabling direct connection to the high-side shunt resistor in a 24 V or 48 V bus without level-shifting circuitry. In a typical configuration, V– is tied to system ground, V+ to 3.3 V, and the shunt placed between bus and load - the LT1491AIDHC#PBF measures differential voltage across the shunt while its inputs sit at ~24 V or ~48 V.
Is reverse supply protection implemented in the LT1491AIDHC#PBF, and what is the maximum allowable reverse voltage?
Yes, the LT1491AIDHC#PBF includes built-in reverse supply protection rated to 18 V. When V+ is reversed (i.e., V+ < V–), the device draws less than 1 nA of current - effectively disabling itself without damage or loading the reversed source. This eliminates the need for an external series Schottky diode in battery-powered equipment, preserving efficiency and board space. The specification is verified per Absolute Maximum Ratings table in the LT1491AIDHC#PBF datasheet.
What is the guaranteed input offset voltage specification for the LT1491AIDHC#PBF over its operating temperature range?
The LT1491AIDHC#PBF has a guaranteed maximum input offset voltage of 500 μV over the full operating temperature range of –40°C to +85°C. This value applies specifically to the DHC package variant (as indicated by the "I" grade suffix) and is confirmed in the Electrical Characteristics table on page 4 of the official datasheet. At 25°C, typical offset is 285 μV, and drift is specified at 2 μV/°C max.
LT1491AIDHC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 16-WFDFN Exposed Pad
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LT1491AIDHC#PBF FAQ
1.How can I place an order for LT1491AIDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1491AIDHC#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 LT1491AIDHC#PBF reliable?
The price and inventory of LT1491AIDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1491AIDHC#PBF is usually 5 days.
3.What payment methods are accepted for LT1491AIDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1491AIDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1491AIDHC#PBF?
LT1491AIDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1491AIDHC#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 LT1491AIDHC#PBF?
For technical support, including LT1491AIDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1491AIDHC#PBF requirements.
6.How does Aetrix verify that LT1491AIDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LT1491AIDHC#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 LT1491AIDHC#PBF meets industry standards.
7.What is the process for return or replacement of LT1491AIDHC#PBF?
All LT1491AIDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1491AIDHC#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 LT1491AIDHC#PBF part is unused and in its original packaging.
Return procedure for LT1491AIDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1491AIDHC#PBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
