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Analog Devices Inc. LT1672CS8#PBF
- Part No.:
- LT1672CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1672CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
LT1672CS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, ultralow-power, decompensated precision rail-to-rail input/output operational amplifier optimized for micropower instrumentation in battery- or solar-powered systems. It delivers 2µA max supply current per amplifier, 375µV max input offset voltage, and 12kHz gain bandwidth product while operating from 2.2V to 36V supplies and supporting inputs above V+ (Over-The-Top™ architecture).
For engineers reviewing the LT1672CS8#PBF datasheet, LT1672CS8#PBF pinout, LT1672CS8#PBF application, or LT1672CS8#PBF equivalent, key selection criteria include its rail-to-rail I/O capability, reverse-battery protection to –18V, 250pA input bias current, 100V/mV minimum open-loop gain, and compatibility with high-impedance sensor interfaces such as photodiode amplifiers and remote sensor front-ends.
Technical Context
The LT1672CS8#PBF employs a three-stage topology: a rail-to-rail input stage with dual differential pairs enabling Over-The-Top operation (inputs > V+), a folded-cascode second stage delivering most voltage gain, and a rail-to-rail common-emitter output stage. Its decompensated design requires minimum closed-loop gain of 5 for stability.
It achieves 90dB PSRR and CMRR over 0V–4V common-mode range at 5V supply, maintains low drift (0.4µV/°C typical), and supports single-supply operation with input range extending to –0.3V and output swing within 35mV of rails under light load - critical for precision signal conditioning in energy-constrained environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2µA max per amplifier - enables multi-year battery life in portable instrumentation and remote sensors. |
| Input Offset Voltage | 375µV max at 5V supply - ensures <0.04% gain error in 100kΩ-load precision gain stages. |
| Gain Bandwidth Product | 12kHz at AV ≥ 5 - suitable for DC-coupled sensor amplification and low-frequency filtering (e.g., 1kHz anti-aliasing). |
| Rail-to-Rail I/O | Inputs operate from –0.3V to 36V; outputs swing to within 35mV of rails - maximizes dynamic range in single-supply 3V/5V systems. |
| Over-The-Top Input | Inputs function up to V+ + 0.3V - allows direct interfacing with high-side current sense or industrial voltage monitoring above supply rail. |
| Reverse Battery Protection | Withstands –18V supply - eliminates need for external series diode in automotive or field-deployed equipment. |
| Input Bias Current | 250pA max - permits use of >1MΩ source impedances without significant offset error (e.g., pH electrodes, piezoresistive sensors). |
Pinout & Package
LT1672CS8#PBF is housed in an 8-lead plastic SO (S8) package, 3.9mm × 4.9mm, 1.27mm pitch, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Capable of sourcing/sinking 500µA; rail-to-rail swing supports direct interface with ADC reference or comparator inputs. |
| 2 (–IN) | Inverting input | High-impedance node (250pA IB); compatible with megohm-level feedback networks and photodiode cathodes. |
| 3 (+IN) | Non-inverting input | Same Over-The-Top capability as –IN; enables high-side sensing configurations where input exceeds V+. |
| 4 (V–) | Negative supply rail | Accepts ground or negative voltage; input common mode extends 300mV below V– at room temperature. |
| 5 (NC) | No connect | Internally unconnected; must be left floating or tied to GND per layout best practices. |
| 6 (NC) | No connect | Internally unconnected; no electrical function; avoid routing signals or power near this pin. |
| 7 (V+) | Positive supply rail | Supports 2.2V–36V operation; reverse-battery protected to –18V on this pin. |
| 8 (NC) | No connect | Internally unconnected; no thermal or electrical role; PCB pad may be omitted or grounded for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top™ input architecture | Enables input voltages exceeding V+ by up to 300mV - simplifies high-side current sensing and industrial voltage monitoring without level-shifting circuitry. |
| 250pA max input bias current | Allows direct connection to high-impedance sources (e.g., 10MΩ photodiodes) with <1µV added offset error - essential for low-light optical detection. |
| 100V/mV min open-loop gain | Ensures <0.1% gain error in unity-gain stable configurations using external compensation - improves accuracy in precision instrumentation amplifiers. |
| 4µVP-P 0.1Hz–10Hz noise | Provides clean DC amplification for microvolt-level sensor outputs (e.g., thermocouples, strain gauges) without requiring additional filtering stages. |
| –40°C to +85°C guaranteed operation | Qualified for industrial and outdoor deployment - maintains 375µV VOS max and 2µA IS max across full temperature range. |
Applications
| Battery- or Solar-Powered Systems | Remote Sensor Amplifier |
|---|---|
Use Scenario: Long-life data loggers powered by coin cells or thin-film solar harvesters monitor environmental parameters over years without maintenance. IC Role / Device Role / Timing Role: Precision front-end amplifier for thermistor, humidity, or gas sensor bridges - digitized by ultra-low-power SAR ADC. Use Value: 2µA supply current extends battery life beyond 10 years; rail-to-rail I/O preserves full ADC input range at 1.8V–3.3V supply. | Use Scenario: Wireless soil moisture or structural strain nodes deployed in inaccessible locations transmit via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Low-drift, high-Z buffer for resistive or capacitive transducers - immune to supply fluctuations during RF transmission bursts. Use Value: 250pA input bias prevents measurement drift in MΩ-range sensor elements; reverse-battery protection avoids field failure during battery replacement. |
| Photodiode Amplifier | High Impedance Circuits |
Use Scenario: Optical smoke detectors or UV index monitors require sub-nA photocurrent resolution under ambient lighting. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to voltage - configured with 10MΩ feedback resistor and 20pF compensation. Use Value: 4µVP-P low-frequency noise enables 10pA resolution; Over-The-Top input accommodates biased photodiode anodes at V+. | Use Scenario: Medical ECG front-ends or lab-grade pH meters demand minimal loading of passive RC filters and electrode interfaces. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Q filter stages or driving long cables - preserving phase linearity and settling time. Use Value: 100V/mV open-loop gain ensures <0.01% gain error; 0.4µV/°C drift minimizes calibration frequency in clinical devices. |
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 |
|---|---|---|---|
| LT1494CS8#PBF | Unity-gain stable; 1.5µA IS; 350µV VOS max; same S8 package | Preferred for AV = 1 configurations (e.g., buffers, followers); lower supply current but reduced GBW (10kHz) | Select LT1494CS8#PBF when gain ≥ 1 is required without external compensation; not drop-in for AV ≥ 5 designs. |
| LT1782CS5#TRMPBF | SOT-23-5 package; 55µA IS; 800µV VOS max; includes shutdown pin | Used where board space is constrained and power cycling is needed; higher current limits continuous operation in energy-harvesting systems | Choose LT1782CS5#TRMPBF only if footprint reduction or shutdown functionality outweighs 27× higher supply current and 2× higher offset. |
Compared with LT1494CS8#PBF and LT1782CS5#TRMPBF, the LT1672CS8#PBF uniquely balances ultra-low quiescent current (2µA), Over-The-Top input capability, and precision specs (375µV VOS) in an industry-standard SO-8 - making it optimal for fixed-gain, high-reliability sensor signal chains where supply headroom and input voltage range are critical.
Availability
LT1672CS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, remote sensor amplifiers, and photodiode front-ends requiring stable component supply across extended production lifecycles.
Supply support for LT1672CS8#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 including the LT167x series.
The LT1672CS8#PBF belongs to Linear's Over-The-Top™ precision micropower op amp family, designed specifically for high-accuracy, ultra-low-power signal conditioning in harsh or energy-constrained environments - from industrial sensors to portable medical diagnostics.
FAQ
What is the minimum stable gain for LT1672CS8#PBF?
The LT1672CS8#PBF is decompensated and requires a minimum closed-loop gain of 5 for stable operation. Attempting unity-gain or gain-of-2 configurations will cause peaking or oscillation. For unity-gain applications, the pin-compatible LT1494CS8#PBF is the recommended alternative - it shares the same S8 package and Over-The-Top architecture but is unity-gain stable.
Does LT1672CS8#PBF support true rail-to-rail input when powered from a 3V supply?
Yes, the LT1672CS8#PBF supports rail-to-rail input down to –0.3V and up to 36V regardless of supply voltage. At 3V supply, its input common-mode range extends from –0.3V to 3.3V, fully covering the supply rails and enabling direct interfacing with 0–3V sensor outputs or overvoltage-tolerant industrial signals. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
Can LT1672CS8#PBF drive a 100kΩ load while maintaining rail-to-rail output swing?
Yes, the LT1672CS8#PBF guarantees rail-to-rail output swing into a 100kΩ load: VOH is specified as V+ – 0.16V (min) and VOL as 410mV (max) at ISINK = 100µA. With 100kΩ load drawing 30µA at mid-supply, the output remains within 100mV of both rails - verified across –40°C to +85°C. This makes LT1672CS8#PBF suitable for driving precision ADC references or comparator inputs directly.
Is LT1672CS8#PBF qualified for automotive applications?
No, the LT1672CS8#PBF is rated for –40°C to +85°C operation and is not AEC-Q200 qualified. While its temperature range overlaps with commercial automotive cabin modules, it lacks automotive-specific qualification, enhanced ESD robustness (beyond standard HBM), and PPAP documentation. For automotive use, consider the pin-compatible LT1672CDD#PBF (DFN package) or consult Analog Devices' automotive-grade alternatives like the ADA4522-1.
How does the Over-The-Top™ feature of LT1672CS8#PBF benefit high-side current sensing?
The Over-The-Top™ feature allows the LT1672CS8#PBF's inputs to operate up to ~0.3V above V+, enabling direct connection to the high-side shunt resistor terminal without level-shifting. In a 12V automotive system, this lets the amplifier measure current through a shunt placed between battery+ and load - rejecting common-mode voltage while consuming only 2µA. This eliminates external components, reduces error sources, and improves reliability in battery-monitoring circuits.
LT1672CS8#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:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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
LT1672CS8#PBF FAQ
1.How can I place an order for LT1672CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1672CS8#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 LT1672CS8#PBF reliable?
The price and inventory of LT1672CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1672CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1672CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1672CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1672CS8#PBF?
LT1672CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1672CS8#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 LT1672CS8#PBF?
For technical support, including LT1672CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1672CS8#PBF requirements.
6.How does Aetrix verify that LT1672CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1672CS8#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 LT1672CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1672CS8#PBF?
All LT1672CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1672CS8#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 LT1672CS8#PBF part is unused and in its original packaging.
Return procedure for LT1672CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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