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Analog Devices Inc. LT1673CS8#PBF
- Part No.:
- LT1673CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1673CS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1673CS8#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, ultralow-power, precision rail-to-rail input and output operational amplifier with Over-The-Top™ input capability. It delivers 2 µA max supply current per amplifier, 375 µV max input offset voltage, and 12 kHz gain bandwidth product across a 2.2 V to 36 V supply range - enabling use in battery-powered sensor front-ends and micropower instrumentation.
For engineers reviewing the LT1673CS8#PBF datasheet, LT1673CS8#PBF pinout, LT1673CS8#PBF application, or LT1673CS8#PBF equivalent, key selection considerations include its guaranteed operation above V+, reverse battery protection to –18 V, rail-to-rail I/O swing, low 250 pA input bias current, and compatibility with high-impedance source networks up to megohm level.
Technical Context
The LT1673CS8#PBF implements a three-stage architecture: a rail-to-rail input stage with dual differential pairs (NPN and PNP) enabling Over-The-Top operation beyond V+, a folded-cascode second stage delivering most voltage gain, and a rail-to-rail common-emitter output stage optimized for full swing. Its decompensated design requires minimum closed-loop gain of 5 for stability.
Input common-mode range extends from –0.3 V to 36 V (single-supply) or –14.8 V to +21 V (dual-supply), while output swing reaches within 35 mV of V+ and 100 mV of V– under 100 µA load. PSRR and CMRR are both ≥90 dB over 0 V to 4 V common-mode range at 5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amplifier | 2 µA max - enables multi-year battery life in always-on remote sensors |
| Input Offset Voltage | 375 µV max at 5 V supply - ensures <0.1% error in 12-bit precision signal chains |
| Gain Bandwidth Product | 12 kHz - supports stable DC-coupled filtering and slow-slew applications like thermocouple amplification |
| Input Bias Current | 250 pA max - permits direct interfacing with >1 MΩ photodiode or pH electrode sources without significant error |
| Rail-to-Rail I/O | Input: –0.3 V to 36 V; Output: within 35 mV of V+, 100 mV of V– - maximizes dynamic range in single-supply systems |
| Over-The-Top Input | Inputs operate up to 36 V above V–, including >V+ - eliminates need for level-shifting in high-side current sensing |
| Reverse Battery Protection | Withstands –18 V supply - enables robust deployment in automotive and industrial battery-powered equipment |
Pinout & Package
LT1673CS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9 mm × 4.9 mm × 1.5 mm, with standard dual op amp pinout and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Capable of sourcing/sinking 500 µA; rail-to-rail swing supports direct interface to ADC reference or comparator inputs |
| 2 (–IN A) | Inverting input A | Low 250 pA bias current preserves accuracy with high-Z feedback networks |
| 3 (+IN A) | Non-inverting input A | Operates up to 36 V above V–, enabling high-side sensing without external level shifters |
| 4 (V–) | Negative supply rail | Reference for all internal circuitry; reverse-battery protected to –18 V |
| 5 (V+) | Positive supply rail | Supports 2.2 V to 36 V operation; PSRR ≥90 dB minimizes supply noise coupling |
| 6 (OUT B) | Amplifier B output | Independent channel; identical specs to OUT A - enables dual-path signal conditioning |
| 7 (–IN B) | Inverting input B | Matched offset and bias performance to Channel A for differential pair configurations |
| 8 (+IN B) | Non-inverting input B | Same Over-The-Top capability as +IN A - supports dual high-side monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow supply current | 2 µA per amplifier - reduces quiescent power to ≤60 µW at 3 V, critical for energy-harvesting nodes |
| Over-The-Top™ input architecture | Inputs functional >V+ - enables direct connection to battery or bus voltage without resistive dividers |
| Precision DC performance | 375 µV max VOS, 0.4 µV/°C drift - maintains calibration integrity over temperature in portable instruments |
| Rail-to-rail input and output | Full 0 V to V+ input range and output swing within 35 mV of rails - maximizes usable ADC input range |
| High impedance input stage | 250 pA max IB, 20 pA max IOS - avoids loading errors in megohm-level sensor interfaces (e.g., pH, photodiode) |
| Robust supply tolerance | 2.2 V to 36 V operation with –18 V reverse-battery rating - simplifies power design in harsh environments |
Applications
| Battery Current Monitor | Photodiode Amplifier |
|---|---|
Use Scenario: High-side current sensing in solar charge controllers using a 0.1 Ω sense resistor and 12 V battery rail. IC Role / Device Role / Timing Role: Dual op amp configured as precision difference amplifier and comparator with hysteresis for charge/discharge state detection. Use Value: Over-The-Top inputs directly monitor VBAT without level shifting; 2 µA quiescent current prevents parasitic drain on standby battery. |
Use Scenario: Low-noise transimpedance amplification of IR photodiode (ODD-45W) in optical gas sensors. IC Role / Device Role / Timing Role: Single-channel TIA with 10 MΩ feedback resistor; second channel buffers reference or enables dual-wavelength ratioing. Use Value: 4 µVP-P (0.1–10 Hz) input noise and 250 pA bias current preserve SNR in nA-level photocurrent detection. |
| Remote Sensor Amplifier | Micropower Filter |
Use Scenario: Signal conditioning for a 4–20 mA loop-powered RTD transmitter located 100+ meters from control unit. IC Role / Device Role / Timing Role: Dual amplifier used for excitation current generation and ratiometric bridge amplification. Use Value: Rail-to-rail I/O and 36 V max supply support 24 V loop compliance; low VOS ensures <0.1 °C error in 0–100 °C range. |
Use Scenario: 1st-order active low-pass filter (1 kHz cutoff) in a wearable ECG front-end powered by coin cell. IC Role / Device Role / Timing Role: Single amplifier in unity-gain buffer + RC configuration; second channel provides reference buffering. Use Value: 12 kHz GBW ensures stable 1 kHz response; 2 µA supply current extends battery life beyond 5 years at continuous operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1495CS8#PBF | Unity-gain stable; 1.5 µA IS; 200 kHz GBW; 950 µV VOS max | Better for AC-coupled, higher-speed (>10 kHz) signal paths; less suitable for ultra-low-drift DC apps | Select when bandwidth >10 kHz required and offset <500 µV not mandatory |
| LT2179IS8#PBF | 17 µA IS; 60 kHz GBW; 120 µV VOS max; no Over-The-Top input | Higher speed and lower offset, but lacks >V+ input capability and consumes 8.5× more current | Choose for precision DC applications needing <150 µV offset where supply current >10 µA is acceptable |
Compared with LT1673CS8#PBF, LT1495CS8#PBF trades 12 kHz bandwidth and Over-The-Top operation for unity-gain stability and slightly lower supply current, while LT2179IS8#PBF offers superior DC precision and bandwidth at significantly higher quiescent power and loss of high-side sensing capability.
Availability
LT1673CS8#PBF is available at Aetrix Electronics and suitable for battery-powered systems, portable instrumentation, and remote sensor amplifier designs requiring stable component supply with long-term lifecycle assurance.
Supply support for LT1673CS8#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 technical and manufacturing continuity for legacy Linear op amp families.
The LT1673CS8#PBF belongs to Linear's Over-The-Top™ micropower precision op amp family, designed specifically for ultra-low-power, high-voltage-sensing applications in harsh environments such as industrial monitoring and portable medical devices.
FAQ
What is the minimum supply voltage for reliable operation of the LT1673CS8#PBF?
The LT1673CS8#PBF is specified to operate down to 2.2 V across the full –40°C to +85°C temperature range. At room temperature, functional operation begins at 2.1 V, but design margin should be taken from the 2.2 V min spec. Below this, open-loop gain drops below 100 V/mV and output swing degrades - critical for precision applications using LT1673CS8#PBF.
Can the LT1673CS8#PBF drive capacitive loads, and what is the maximum recommended value?
Yes, the LT1673CS8#PBF can drive capacitive loads, but stability depends on output voltage and gain. With output biased near mid-supply and AV = 5, it remains stable with ≤100 pF. If the output operates within 100 mV of V+, allowable capacitance drops to ≤500 pF at 5 V supply and ≤100 pF at 30 V supply - verified in the Capacitive Load Handling graph of the LT1673CS8#PBF datasheet.
Does the LT1673CS8#PBF require external compensation for stability?
No, the LT1673CS8#PBF is internally compensated for minimum closed-loop gain of 5. It is decompensated by design to achieve ultralow supply current. Using it at gains <5 (e.g., unity gain) will cause instability and oscillation. For unity-gain applications, the pin-compatible LT1495CS8#PBF - a unity-gain stable version of the same family - must be selected instead of LT1673CS8#PBF.
How does the Over-The-Top™ input feature benefit high-side current sensing with the LT1673CS8#PBF?
The Over-The-Top™ input allows the +IN and –IN pins of LT1673CS8#PBF to operate up to 36 V above V–, including voltages exceeding V+. This enables direct connection to the high side of a shunt resistor placed between battery and load - eliminating level-shifting resistors, reducing component count, and avoiding errors from resistor mismatch or thermal drift in circuits using LT1673CS8#PBF.
What is the typical input offset voltage drift over temperature for the LT1673CS8#PBF?
The LT1673CS8#PBF has a typical input offset voltage drift of 0.4 µV/°C, with a maximum of 2 µV/°C over –40°C to +85°C. This low drift ensures minimal calibration drift in precision instrumentation - for example, contributing only ~0.04 mV error over a 100°C span, making LT1673CS8#PBF suitable for high-stability sensor signal chains where long-term accuracy matters.
LT1673CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.005V/µs
- Gain Bandwidth Product:
- 12 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.9µA (x2 Channels)
- 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
LT1673CS8#PBF FAQ
1.How can I place an order for LT1673CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1673CS8#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 LT1673CS8#PBF reliable?
The price and inventory of LT1673CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1673CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1673CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1673CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1673CS8#PBF?
LT1673CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1673CS8#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 LT1673CS8#PBF?
For technical support, including LT1673CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1673CS8#PBF requirements.
6.How does Aetrix verify that LT1673CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1673CS8#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 LT1673CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1673CS8#PBF?
All LT1673CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1673CS8#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 LT1673CS8#PBF part is unused and in its original packaging.
Return procedure for LT1673CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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