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Analog Devices Inc. LT1494CS8#PBF
- Part No.:
- LT1494CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1494CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LT1494CS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, micropower, rail-to-rail input and output precision operational amplifier with Over-The-Top™ input architecture. It delivers 1.5µA max supply current, 375µV max input offset voltage, and operates from 2.2V to 36V supply rails across –40°C to 85°C. It is used in battery-powered sensor front-ends where ultra-low quiescent current and input operation above V+ are critical.
For engineers reviewing the LT1494CS8#PBF datasheet, LT1494CS8#PBF pinout, LT1494CS8#PBF application, or LT1494CS8#PBF equivalent, key selection criteria include guaranteed rail-to-rail I/O swing at ≤2µA supply, reverse-battery protection to –18V, and verified performance over extended temperature and supply ranges without external biasing.
Technical Context
The LT1494CS8#PBF employs a three-stage topology: a dual-differential-pair Over-The-Top™ input stage enabling operation up to 36V above V– (including >V+), a folded-cascode second stage for high open-loop gain (≥100 V/mV), and a rail-to-rail common-emitter output stage delivering ±500µA drive capability. Its input bias current remains ≤250pA across –40°C to 85°C.
It achieves 90dB PSRR and CMRR at DC, maintains stable gain (AVOL ≥100 V/mV) under 100kΩ load, and supports single-supply operation with input range from –0.3V to 36V - enabling direct interfacing with high-side current-sense resistors and industrial sensors without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amplifier | 1.5µA max - enables multi-year operation on coin-cell batteries in remote sensor nodes. |
| Input Offset Voltage | 375µV max at 25°C - ensures <0.1% error in 12-bit precision signal conditioning at unity gain. |
| Rail-to-Rail Input Range | –0.3V to 36V - allows direct sensing of signals above V+ (e.g., high-side shunt monitoring at 24V bus). |
| Output Swing (RL = 100kΩ) | V– + 210mV / V+ – 320mV - delivers full dynamic range into moderate loads without headroom loss. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial automation and automotive cabin electronics. |
| Reverse Battery Protection | –18V min - survives accidental battery reversal in portable instrumentation without external diodes. |
| Input Bias Current | 250pA max - permits use of >1MΩ source impedances without significant offset error. |
Pinout & Package
LT1494CS8#PBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 0.150-inch width, RoHS-compliant and lead-free.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connect - electrically isolated; no routing or grounding required. |
| 2 | V+ | Positive supply rail - accepts 2.2V to 36V; reverse-battery protected to –18V. |
| 3 | OUT | Amplifier output - rail-to-rail swing, ±500µA drive, stable with ≤100pF capacitive load. |
| 4 | NC | No connect - electrically isolated; must not be tied to any net. |
| 5 | NC | No connect - electrically isolated; no thermal or electrical function. |
| 6 | –IN | Inverting input - differential pair node; supports common-mode voltage up to 36V. |
| 7 | +IN | Non-inverting input - differential pair node; Over-The-Top™ architecture enables >V+ operation. |
| 8 | V– | Negative supply rail - reference for all internal biasing; accepts ground or negative voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top™ Input Architecture | Enables input voltages up to 36V above V–, including operation >V+, eliminating level-shifters in high-side sensing. |
| Micropower Operation | 1.5µA max supply current per amplifier - reduces system standby power by >90% vs. standard precision op amps. |
| Rail-to-Rail Input & Output | Full input range (–0.3V to 36V) and output swing (within 210mV of rails) maximize ADC utilization in low-voltage systems. |
| Low Input Offset Drift | 0.4µV/°C typical - limits temperature-induced error to <10µV over 0°C–70°C ambient, critical for uncalibrated field sensors. |
| High Open-Loop Gain | ≥100 V/mV driving 100kΩ - ensures <0.01% gain error in closed-loop configurations with gains ≥10. |
| Reverse Battery Protection | Survives –18V applied to V+ with <100nA leakage - removes need for series diode, preserving supply efficiency. |
Applications
| Battery-Powered Sensor Node | Remote Industrial Current Monitor |
|---|---|
|
Use Scenario: Continuous measurement of 4–20mA loop current in wireless field transmitters powered by AA batteries. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with rail-to-rail output driving 12-bit SAR ADC. Use Value: 1.5µA supply current extends battery life beyond 10 years; Over-The-Top™ inputs directly sense shunt voltage referenced to 24V bus. |
Use Scenario: High-side current sensing in PLC analog input modules operating from 24V DC industrial rails. IC Role / Device Role / Timing Role: Single-supply difference amplifier front-end for isolated current measurement. Use Value: Input range up to 36V enables direct connection to shunt without attenuation; reverse-battery tolerance prevents damage during maintenance swaps. |
| Micropower Integrating Ammeter | Low-Power Filter for Environmental Sensors |
|
Use Scenario: Integrating charge from photodiode or electrochemical sensor in portable gas analyzers. IC Role / Device Role / Timing Role: Ultra-low-IBB integrator core with <250pA bias current minimizing integration drift. Use Value: 250pA max input bias current limits integration error to <1 LSB/hour in 16-bit systems; rail-to-rail output maximizes dynamic range. |
Use Scenario: Anti-aliasing and noise filtering for thermistor or humidity sensor outputs in battery-operated weather stations. IC Role / Device Role / Timing Role: Active 10Hz elliptic low-pass filter stage with precision DC gain stability. Use Value: 375µV max VOS ensures <0.05% absolute accuracy in DC-coupled signal chains; 1.5µA current enables always-on filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1672CS8#PBF | 2µA max supply current; decompensated (min gain = 5); 12kHz GBW vs. LT1494CS8#PBF's 2.7kHz. | Requires minimum closed-loop gain of 5; unsuitable for unity-gain buffer or integrator applications. | Select when higher bandwidth is needed and gain ≥5 is acceptable; avoid for low-gain or DC-stable integrators. |
| LT1782IS5#TRMPBF | SOT-23-5 package; 55µA supply current; 800µV max VOS; includes shutdown pin. | Higher power and offset; smaller footprint; shutdown enables dynamic power cycling not possible with LT1494CS8#PBF. | Select for space-constrained designs where 55µA is acceptable and active power gating is required. |
Compared with LT1672CS8#PBF and LT1782IS5#TRMPBF, the LT1494CS8#PBF uniquely combines unity-gain stability, sub-2µA quiescent current, and 375µV max offset - making it irreplaceable in always-on, low-gain, high-accuracy DC signal chains where layout area and PCB layer count are secondary to energy efficiency and precision.
Availability
LT1494CS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, remote sensor amplifiers, and micropower filter applications requiring stable component supply across industrial temperature grades and long production lifecycles.
Supply support for LT1494CS8#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 support, qualification, and manufacturing continuity for legacy Linear parts including the LT1494 family.
The LT1494 series was designed specifically for ultra-low-power, high-precision analog signal conditioning in harsh environments - emphasizing rail-to-rail operation, Over-The-Top™ input robustness, and guaranteed performance from –40°C to 85°C.
FAQ
What is the maximum supply voltage rating for LT1494CS8#PBF?
The LT1494CS8#PBF has a total supply voltage (V+ to V–) rating of 36V. Absolute maximum ratings specify differential input voltage up to 36V and continuous output short-circuit duration. Operation is fully specified from 2.2V to 36V single supply or ±2.5V to ±15V dual supply. Exceeding 36V risks permanent device damage.
Does LT1494CS8#PBF support true rail-to-rail input operation above the positive supply rail?
Yes. The LT1494CS8#PBF features Linear Technology's proprietary Over-The-Top™ input architecture, allowing its inputs to operate continuously up to 36V above V– - including voltages exceeding V+. This enables direct high-side current sensing without external level-shifting circuitry, a capability confirmed in the device's simplified schematic and absolute maximum ratings table.
What is the guaranteed input offset voltage specification for LT1494CS8#PBF over temperature?
The LT1494CS8#PBF guarantees a maximum input offset voltage of 375µV at TA = 25°C (VS = 5V). Over the full –40°C to +85°C operating range, the datasheet specifies 475µV max (VS = 5V) and 575µV max (VS = 5V, MS8 package). These values are production-tested limits, not typicals, and apply to the C-grade version denoted by the 'C' in LT1494CS8#PBF.
Can LT1494CS8#PBF be used in a unity-gain stable configuration?
Yes. The LT1494CS8#PBF is explicitly characterized and guaranteed for unity-gain stability. Its gain-bandwidth product is 2.7kHz and phase margin exceeds 60° at AV = 1, as shown in the "Gain and Phase Shift vs Frequency" plot. Unlike decompensated alternatives such as the LT1672, the LT1494CS8#PBF requires no minimum closed-loop gain and may be used as a buffer or integrator without risk of oscillation.
Is LT1494CS8#PBF pin-compatible with other members of the LT1494/LT1495/LT1496 family?
No. The LT1494CS8#PBF (single amplifier) uses an 8-pin SO package with NC pins at positions 1, 4, and 5. In contrast, the dual LT1495CS8#PBF uses the same S8 package but with functional pins at all eight positions and a different pinout (e.g., OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B). Direct substitution is not possible without PCB redesign.
LT1494CS8#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1494CS8#PBF FAQ
1.How can I place an order for LT1494CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1494CS8#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 LT1494CS8#PBF reliable?
The price and inventory of LT1494CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1494CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1494CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1494CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1494CS8#PBF?
LT1494CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1494CS8#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 LT1494CS8#PBF?
For technical support, including LT1494CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1494CS8#PBF requirements.
6.How does Aetrix verify that LT1494CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1494CS8#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 LT1494CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1494CS8#PBF?
All LT1494CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1494CS8#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 LT1494CS8#PBF part is unused and in its original packaging.
Return procedure for LT1494CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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