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Analog Devices Inc. LT1491AHS#TRPBF
- Part No.:
- LT1491AHS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1491AHS#TRPBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,654
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Product details
Overview
LT1491AHS#TRPBF from Analog Devices (formerly Linear Technology) is a quad rail-to-rail input/output micropower operational amplifier optimized for high-voltage single-supply operation. It features 500 μV max input offset voltage, 40 μA per amplifier quiescent current, ±20 mA output drive capability, and Over-The-Top® input stage enabling common-mode operation up to 44 V above V– independent of V+. It is widely used in battery monitoring, supply current sensing, and sensor conditioning circuits operating from 2 V to 44 V total supply.
For engineers reviewing the LT1491AHS#TRPBF datasheet, LT1491AHS#TRPBF pinout, LT1491AHS#TRPBF application, or LT1491AHS#TRPBF equivalent, key selection criteria include guaranteed –40°C to 125°C operation, reverse-battery protection to 18 V, rail-to-rail I/O swing, 200 kHz gain bandwidth, and compatibility with capacitive loads up to 10,000 pF using optional compensation.
Technical Context
The LT1491AHS#TRPBF employs a dual-input-stage architecture (NPN + PNP) enabling true Over-The-Top® operation: inputs remain functional and high-impedance even when biased 44 V above V–, regardless of V+ level. Its internal protection includes 1 kΩ series resistors and clamping diodes limiting fault current below V– by up to 15 V, eliminating phase reversal under overvoltage conditions.
It is unity-gain stable and internally compensated for ≥200 pF load capacitance; optional 0.22 μF/150 Ω output network extends stable driving capability to 10,000 pF. The device draws <1 nA supply current during reverse-battery fault (–18 V), and shuts down cleanly when V+ is removed while maintaining sub-0.5 nA input bias current even with inputs at 44 V above V–.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 44 V total - supports wide-range battery, industrial, and automotive power rails without external regulation |
| Quiescent Current | 40 μA per amplifier - enables multi-year operation in coin-cell-powered systems |
| Input Offset Voltage | 500 μV max (–40°C to 125°C) - ensures precision DC signal amplification without trimming |
| Output Drive | ±20 mA - directly interfaces with LEDs, MOSFET gates, and low-impedance transducers |
| Gain Bandwidth Product | 200 kHz - sufficient for sensor signal conditioning, active filtering, and slow-control loops |
| CMRR | 98 dB - rejects common-mode noise in high-side current sensing and noisy supply environments |
| Reverse Supply Protection | 18 V - eliminates need for external blocking diodes in battery-reversal-prone applications |
Pinout & Package
LT1491AHS#TRPBF is packaged in a 14-lead plastic SO (S8) package with exposed pad connected to V–, rated for –40°C to 125°C operation and θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - rail-to-rail swing capable of sourcing/sinking ±20 mA |
| 2 | –IN A | Inverting input of Amp A - protected against faults ≤15 V below V– |
| 3 | +IN A | Non-inverting input of Amp A - operates up to 44 V above V–, independent of V+ |
| 4 | V+ | Positive supply rail - bypass with 0.01 μF capacitor within 25 mm |
| 5 | +IN B | Non-inverting input of Amp B - identical Over-The-Top® voltage range as Pin 3 |
| 6 | –IN B | Inverting input of Amp B - matched bias and protection to Pin 2 |
| 7 | OUT B | Amplifier B output - electrically identical to Pin 1 |
| 8 | NC | No connect - not internally bonded; must be left floating or grounded per layout best practice |
| 9 | OUT D | Amplifier D output - fourth independent output channel |
| 10 | –IN D | Inverting input of Amp D - fully specified across full temperature range |
| 11 | +IN D | Non-inverting input of Amp D - supports same Over-The-Top® operation as Pins 3 and 5 |
| 12 | V– | Negative supply rail - underside metal pad is internally connected to this pin |
| 13 | +IN C | Non-inverting input of Amp C - matches performance of other inputs |
| 14 | –IN C | Inverting input of Amp C - matched to all other inverting inputs |
| 15 | OUT C | Amplifier C output - completes quad-channel functionality |
| 16 | NC | No connect - unused pin; no internal connection |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables input operation 44 V above V– on any supply - critical for high-side sensing without level-shifting |
| Rail-to-Rail I/O Swing | Outputs swing within 10 mV of V– and 25 mV of V+ at 5 mA - maximizes dynamic range in low-voltage systems |
| Reverse Battery Protection | Draws <1 nA at –18 V reverse supply - eliminates external protection components and leakage paths |
| Capacitive Load Drive | Stable with ≥200 pF; extended to 10,000 pF via 0.22 μF/150 Ω network - supports long traces and LCD drivers |
| High-Voltage Gain | 1500 V/mV (124 dB) open-loop gain - ensures low closed-loop error in precision gain stages |
| No Phase Reversal | Guaranteed absence of output inversion for inputs 15 V below V– or 44 V above V– - prevents system latch-up |
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, solar charge controllers, and EV auxiliary systems. IC Role / Device Role: Quad amplifier configured as differential voltage monitor, high-side current shunt amplifier, reference buffer, and comparator hysteresis generator. Use Value: Enables accurate state-of-charge estimation using a single IC with guaranteed operation across –40°C to 125°C and reverse-battery resilience. | Use Scenario: Measuring microamp-to-milliamp supply currents in always-on IoT nodes, medical wearables, and smart meters. IC Role / Device Role: Precision current-sense amplifier with rail-to-rail output driving ADC input or low-power comparator. Use Value: 40 μA quiescent current and 500 μV offset ensure measurement accuracy without degrading system standby power budget. |
| Sensor Conditioning | 4–20 mA Transmitter |
Use Scenario: Amplifying low-level outputs from thermistors, RTDs, bridge sensors, and MEMS accelerometers in industrial process control. IC Role / Device Role: Low-noise, micropower instrumentation amplifier front-end with programmable gain and offset correction. Use Value: Over-The-Top® inputs accept sensor excitation voltages exceeding V+, simplifying analog front-end design for high-common-mode sensors. | Use Scenario: Building two-wire 4–20 mA current loop transmitters for pressure, temperature, and flow sensors in hazardous locations. IC Role / Device Role: Quad op amp implementing voltage-to-current conversion, loop regulation, fault detection, and diagnostic signaling. Use Value: ±20 mA output drive and 44 V input common-mode range support full compliance with HART protocol and intrinsic safety barriers. |
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 |
|---|---|---|---|
| LT1491ACS#TRPBF | Rated for 0°C to 70°C only; lower max input offset (700 μV) and higher GBW (200 kHz typical) at room temperature | Limited to commercial-temperature industrial controls and consumer electronics; not suitable for under-hood or outdoor deployments | Select when cost sensitivity outweighs extended temperature requirement and ambient stays within 0°C–70°C |
| OP482ARUZ | Higher quiescent current (125 μA/amplifier), lower input offset (150 μV), but no Over-The-Top® input capability or reverse-battery protection | Requires external protection circuitry for battery-reversal scenarios; unsuitable for high-common-mode (>V+) sensor interfaces | Choose only when ultra-low offset dominates requirements and supply robustness is externally managed |
Compared with LT1491ACS#TRPBF and OP482ARUZ, the LT1491AHS#TRPBF uniquely combines extended temperature rating (–40°C to 125°C), Over-The-Top® input operation, and integrated reverse-battery protection - making it the sole option for ruggedized, single-component high-voltage micropower sensing in harsh environments.
Availability
LT1491AHS#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, supply current sensing, and sensor conditioning applications requiring stable component supply across automotive, industrial, and energy infrastructure programs.
Supply support for LT1491AHS#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LT1491AHS#TRPBF belongs to ADI's legacy Linear Technology precision op amp product line, engineered specifically for micropower, high-voltage, rail-to-rail signal conditioning in space-constrained, battery-operated, and fault-tolerant systems.
FAQ
What is the maximum common-mode input voltage range for LT1491AHS#TRPBF?
The LT1491AHS#TRPBF supports an input common-mode voltage range extending from 0.3 V above V– to 44 V above V–, independent of the V+ supply level. This Over-The-Top® capability allows direct interfacing with high-side shunts, battery terminals, and sensors operating at voltages far exceeding the amplifier's own supply rails - a feature confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables for the H-grade device.
Does LT1491AHS#TRPBF require external compensation for driving capacitive loads?
The LT1491AHS#TRPBF is internally compensated for stable operation with ≥200 pF capacitive loads. For larger loads up to 10,000 pF - such as LCD panels or long PCB traces - a 0.22 μF capacitor in series with a 150 Ω resistor must be placed between output and ground. This configuration is explicitly validated in the datasheet's "Typical Applications" and "Applications Information" sections for the LT1491AHS#TRPBF.
What is the guaranteed operating temperature range for LT1491AHS#TRPBF?
The LT1491AHS#TRPBF is guaranteed to operate over the full industrial temperature range of –40°C to 125°C, as confirmed by its part number suffix "HS" (H-grade SO package) and the Electrical Characteristics tables labeled "LT1490AH/LT1491AH". This specification is verified per Note 3 and Note 4 in the datasheet and applies across all key parameters including input offset voltage, supply current, and gain bandwidth.
Can LT1491AHS#TRPBF be used in reverse-battery protection circuits without external components?
Yes. The LT1491AHS#TRPBF provides built-in reverse-battery protection up to –18 V, drawing less than 1 nA supply current under reverse polarity conditions. This eliminates the need for external series diodes or MOSFET-based protection circuits - a capability explicitly documented in the "Absolute Maximum Ratings", "Electrical Characteristics", and "Applications Information" sections for the LT1491AHS#TRPBF.
Is LT1491AHS#TRPBF pin-compatible with other packages of the LT1491A family?
No. The LT1491AHS#TRPBF uses the 14-lead SO (S8) package, which has a different pinout and thermal characteristics than the 16-lead DFN (DHC16) variant (e.g., LT1491AIDHC#TRPBF). While both packages contain four amplifiers with identical electrical functionality, the S8 package includes two NC pins (8 and 16) and connects the exposed pad to V–, whereas the DHC16 exposes V– on the underside metal pad only - making them mechanically and thermally non-interchangeable without PCB redesign.
LT1491AHS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 250 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1491AHS#TRPBF FAQ
1.How can I place an order for LT1491AHS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1491AHS#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 LT1491AHS#TRPBF reliable?
The price and inventory of LT1491AHS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1491AHS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1491AHS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1491AHS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1491AHS#TRPBF?
LT1491AHS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1491AHS#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 LT1491AHS#TRPBF?
For technical support, including LT1491AHS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1491AHS#TRPBF requirements.
6.How does Aetrix verify that LT1491AHS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1491AHS#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 LT1491AHS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1491AHS#TRPBF?
All LT1491AHS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1491AHS#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 LT1491AHS#TRPBF part is unused and in its original packaging.
Return procedure for LT1491AHS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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