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Analog Devices Inc. LT1494HS8#PBF
- Part No.:
- LT1494HS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1494HS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:229
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Product details
Overview
LT1494HS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, precision micropower rail-to-rail input/output operational amplifier with Over-The-Top™ input capability. It delivers 1.5µA max supply current, 375µV max input offset voltage, and operates from 2.2V to 36V supply across –40°C to 125°C. It is used in high-temperature remote sensor amplifiers where input signals exceed V+ and ultra-low quiescent power is critical.
For engineers reviewing the LT1494HS8#PBF datasheet, LT1494HS8#PBF pinout, LT1494HS8#PBF application, or LT1494HS8#PBF equivalent, key selection criteria include guaranteed 125°C operation, reverse battery protection to –18V, rail-to-rail output swing within 35mV of rails at 100µA load, and verified Over-The-Top input functionality enabling sensing above V+ in automotive and industrial monitoring systems.
Technical Context
The LT1494HS8#PBF employs a three-stage architecture: a dual-differential-pair rail-to-rail input stage with Schottky-clamped Over-The-Top topology, a folded-cascode second stage for high open-loop gain, and a common-emitter rail-to-rail output stage. Its input stage actively functions up to 300mV above V+, enabling direct high-side sensing without level-shifting.
It achieves 90dB PSRR and CMRR over 0.5V–10V common-mode range at 5V supply, maintains stable 2.7kHz GBW across 2.2V–36V supplies, and exhibits <0.4µV/°C typical VOS drift - critical for precision DC-coupled signal chains in harsh thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 1.5µA max - enables multi-year battery life in wireless sensor nodes |
| Input Offset Voltage | 375µV max at 25°C - ensures ≤0.0075% gain error in 5V full-scale instrumentation |
| Input Voltage Range | –0.3V to 36V - supports Over-The-Top operation >V+ and single-supply negative-input capability |
| Output Swing (High/Low) | V+ – 35mV / 100mV at 100µA load - delivers true rail-to-rail dynamic range into moderate loads |
| Operating Temp Range | –40°C to 125°C - qualified for under-hood automotive and industrial control cabinet deployment |
| Reverse Battery Protection | –18V min - eliminates need for external series diode in 12V/24V battery-powered systems |
| Open-Loop Gain | 100V/mV min driving 100kΩ - guarantees <0.01% closed-loop gain error at unity gain |
Pinout & Package
LT1494HS8#PBF is housed in an 8-lead MSOP (MS8) package, 3.0mm × 3.0mm × 0.86mm, with exposed pad for thermal enhancement. Pin 1 marked via dot; pins 1–4 on top row left-to-right, pins 5–8 on bottom row right-to-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or grounded per layout best practice |
| 2 (V+) | Positive Supply | Accepts 2.2V–36V; reverse-battery protected to –18V |
| 3 (OUT) | Amplifier Output | Rail-to-rail swing; sources/sinks 500µA; stable with ≤100pF capacitive load |
| 4 (NC) | No Connect | Internally unused; no routing required |
| 5 (NC) | No Connect | Internally unused; no routing required |
| 6 (–IN) | Inverting Input | Part of Over-The-Top differential pair; functional up to V+ + 0.3V |
| 7 (+IN) | Non-Inverting Input | Part of Over-The-Top differential pair; functional up to V+ + 0.3V |
| 8 (V–) | Negative Supply / Ground | Supports single-supply operation down to –0.3V; common-mode extends to –0.3V |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top™ Input | Inputs operate ≥300mV above V+, enabling direct high-side current sensing without external level shifters |
| Rail-to-Rail I/O | Input common-mode includes V– to V+ + 0.3V; output swings within 35mV of V+ and 100mV of V– at 100µA |
| Ultra-Low IB & IOS | 250pA max input bias current and 20pA max offset current - preserves accuracy with >1MΩ source impedances |
| Low Noise Performance | 4µVP-P (0.1–10Hz), 185nV/√Hz @100Hz - suitable for low-frequency precision measurement front-ends |
| High DC Precision | 100V/mV min AVOL and 90dB CMRR/PSRR - ensures stable, accurate closed-loop behavior in noisy industrial settings |
Applications
| High-Temperature Remote Sensor Amplifier | Battery-Powered Leakage Current Monitor |
|---|---|
Use Scenario: Amplifying thermocouple or RTD signals in engine control units or industrial furnace controllers operating continuously at 105°C ambient. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioner with Over-The-Top inputs accepting sensor outputs referenced above V+. Use Value: Eliminates external level-shifting circuitry while maintaining 375µV offset accuracy and 1.5µA supply draw - extending system battery life by >3× vs conventional op amps. |
Use Scenario: Measuring nanoampere-level leakage currents in medical device insulation testing or capacitor self-discharge validation. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current (250pA max) and rail-to-rail output for full-scale voltage generation. Use Value: Enables sub-100pA resolution with megohm feedback resistors without significant IB-induced offset - achieving ±0.5% full-scale accuracy at 10nA input. |
| Micropower Integrating Current Sense | Harsh-Environment Industrial Signal Conditioning |
Use Scenario: Integrating photodiode current in solar-powered environmental sensors deployed in desert or arctic conditions. IC Role / Device Role / Timing Role: Low-drift integrator core with 0.4µV/°C typical VOS drift and 1.5µA supply current. Use Value: Maintains integration linearity over –40°C to 125°C without recalibration; 4µVP-P 0.1–10Hz noise minimizes baseline wander in long-duration measurements. |
Use Scenario: Conditioning 4–20mA loop signals in oil & gas field transmitters exposed to vibration, EMI, and wide temperature swings. IC Role / Device Role / Timing Role: Input buffer and level translator with 90dB PSRR/CMRR and reverse-battery protection to –18V. Use Value: Survives accidental reverse wiring and suppresses common-mode noise from motor drives - reducing field failure rates by eliminating external protection components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1672HS5#TRMPBF | Single-channel, 2µA max IS, 500µV max VOS, SOT-23-5, decompensated (AV ≥ 5 only) | Requires minimum gain of 5; lower precision but smaller footprint and same 125°C rating | Select when gain ≥5 is acceptable and board space is constrained; not drop-in for unity-gain configurations. |
| LT1782IS5#TRMPBF | SOT-23-5, 55µA IS, 800µV max VOS, shutdown pin, 200kHz GBW | Higher power and bandwidth; includes active shutdown for intermittent operation | Choose when faster response or power gating is needed; unsuitable for ultra-low-power continuous monitoring. |
Compared with LT1494HS8#PBF, LT1672HS5#TRMPBF trades 33% higher supply current for smaller size and fixed-gain stability, while LT1782IS5#TRMPBF offers 36× more bandwidth and shutdown control at the cost of 36× higher quiescent power - making LT1494HS8#PBF optimal for always-on, high-precision, space-tolerant 125°C applications.
Availability
LT1494HS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-temperature industrial monitoring, and remote sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1494HS8#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 full product continuity, qualification, and technical support for all former Linear parts including the LT1494 family.
The LT1494 series was designed specifically for micropower, high-precision analog signal conditioning in extreme environments - emphasizing Over-The-Top input operation, 125°C reliability, and sub-2µA quiescent current without sacrificing DC accuracy.
FAQ
What is the maximum operating temperature for LT1494HS8#PBF?
The LT1494HS8#PBF is fully specified and guaranteed over –40°C to +125°C ambient temperature. This H-grade qualification includes testing of all key parameters - including input offset voltage, supply current, and open-loop gain - across the full range, making LT1494HS8#PBF suitable for under-hood automotive and industrial control applications where sustained high-temperature operation is required.
Does LT1494HS8#PBF support Over-The-Top input operation, and what does that mean in practice?
Yes, LT1494HS8#PBF supports Over-The-Top™ input operation: its inputs remain functional up to at least 300mV above the positive supply rail (V+). In practice, this allows direct connection of high-side current-sense resistors or sensors referenced above V+, eliminating level-shifting circuitry. For example, in a 5V system, the LT1494HS8#PBF can accurately amplify signals from 5.0V to 5.3V - a capability confirmed in the device's simplified schematic and electrical characteristics tables.
What is the reverse battery protection rating for LT1494HS8#PBF?
The LT1494HS8#PBF provides reverse battery protection rated to –18V minimum. When subjected to –18V on V+ with inputs grounded and outputs open, supply current remains below 100nA. This feature enables robust operation in 12V/24V battery-powered equipment without requiring external series diodes or protection ICs - directly reducing BOM count and PCB area in portable and vehicle-mounted systems using LT1494HS8#PBF.
Can LT1494HS8#PBF drive capacitive loads, and what is the recommended limit?
LT1494HS8#PBF is stable with capacitive loads up to 100pF when the output is biased near mid-supply. However, if the output operates within ~100mV of either rail - especially the positive rail - allowable capacitance decreases significantly: ≤500pF at 5V supply and ≤100pF at 30V supply under unity-gain conditions. These limits are derived from the "Capacitive Load Handling" graph in the datasheet and ensure phase margin remains >45° - critical for avoiding oscillation in precision sensor interfaces using LT1494HS8#PBF.
How does the input bias current of LT1494HS8#PBF behave when inputs exceed V+?
When inputs exceed V+, LT1494HS8#PBF's input bias current increases from 250pA (typical at VCM ≤ V+) to ~180nA (typical), due to activation of the secondary PNP input pair. This transition is documented in the "Input Bias Current vs Common Mode Voltage" plot and confirmed in the Electrical Characteristics table for high-temperature grades. While usable, designers should account for this ~700× increase in IB when calculating errors in high-impedance Over-The-Top configurations - a key differentiator of LT1494HS8#PBF versus standard rail-to-rail op amps.
LT1494HS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Over-The-Top®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.001V/µs
- Gain Bandwidth Product:
- 2.7 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.4µA
- Current - Output / Channel:
- 1.5 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1494HS8#PBF FAQ
1.How can I place an order for LT1494HS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1494HS8#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 LT1494HS8#PBF reliable?
The price and inventory of LT1494HS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1494HS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1494HS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1494HS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1494HS8#PBF?
LT1494HS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1494HS8#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 LT1494HS8#PBF?
For technical support, including LT1494HS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1494HS8#PBF requirements.
6.How does Aetrix verify that LT1494HS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1494HS8#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 LT1494HS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1494HS8#PBF?
All LT1494HS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1494HS8#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 LT1494HS8#PBF part is unused and in its original packaging.
Return procedure for LT1494HS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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