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Analog Devices Inc. LT1672CMS8#PBF
- Part No.:
- LT1672CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1672CMS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1672CMS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, ultralow-power, precision rail-to-rail input and output operational amplifier with Over-The-Top™ input capability. It delivers 2µA max supply current per amplifier, 375µV max input offset voltage, 12kHz gain bandwidth product, and operates from 2.2V to 36V supplies - enabling use in battery-powered sensor front-ends and high-impedance signal conditioning circuits.
For engineers reviewing the LT1672CMS8#PBF datasheet, LT1672CMS8#PBF pinout, LT1672CMS8#PBF application, or LT1672CMS8#PBF equivalent, key selection criteria include micropower operation under 2.5µA, input voltage range extending 0.3V below V– and above V+, rail-to-rail output swing, reverse-battery protection to –18V, and guaranteed performance over –40°C to 85°C.
Technical Context
The LT1672CMS8#PBF employs a three-stage architecture: a dual-differential-pair rail-to-rail input stage (enabling Over-The-Top operation), a folded-cascode second stage for high open-loop gain (≥100 V/mV), and a common-emitter rail-to-rail output stage. Its input bias current remains ≤250pA across the full common-mode range, including operation above V+.
Stability is ensured for closed-loop gains ≥5; it is decompensated for optimized power-to-bandwidth trade-off. The device maintains low noise (4µVP-P, 0.1Hz–10Hz; 185nV/√Hz at 100Hz) and high PSRR/CMRR (90dB typical) across its 2.2V–36V supply range, supporting precision DC and low-frequency AC applications without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2µA max per amplifier - enables multi-year operation on coin-cell batteries in always-on sensor nodes. |
| Input Offset Voltage | 375µV max (–40°C to 85°C) - ensures <0.1% error in 12-bit systems with 1V full-scale signals. |
| Gain Bandwidth Product | 12kHz at AV ≥ 5 - supports stable amplification of low-frequency sensor outputs (e.g., thermocouples, strain gauges). |
| Input Common-Mode Range | –0.3V to 36V (with V– = 0V) - allows direct interfacing to transducers operating above V+ or below ground. |
| Output Swing | Rail-to-rail: within 35mV of V+ and 100mV of V– (ISOURCE/ISINK = 100µA) - maximizes dynamic range in single-supply systems. |
| Reverse Battery Protection | Withstands –18V supply - eliminates need for external series diodes in automotive or industrial battery-powered equipment. |
| Input Bias Current | 250pA max - permits use of >1MΩ source impedances without significant offset error (e.g., pH electrodes, photodiodes). |
Pinout & Package
LT1672CMS8#PBF is housed in an 8-lead MSOP (MS8) package, 3mm × 3mm, 0.65mm pitch, with exposed pad for thermal enhancement. Pin 1 is marked by a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or grounded per layout best practice. |
| 2 (V–) | Negative Supply Rail | Reference for all internal circuitry; supports operation down to –15V in dual-supply mode. |
| 3 (+IN) | Non-Inverting Input | High-impedance node (250pA IB); accepts signals up to 36V regardless of V+ level. |
| 4 (–IN) | Inverting Input | Matches +IN characteristics; used for feedback and summing configurations. |
| 5 (OUT) | Amplifier Output | Capable of sourcing/sinking 500µA while maintaining rail-to-rail swing. |
| 6 (NC) | No Connect | Internally unused; no connection required. |
| 7 (V+) | Positive Supply Rail | Accepts 2.2V to 36V; reverse-battery protected to –18V. |
| 8 (NC) | No Connect | Internally unused; leave unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top™ Input Operation | Inputs function reliably >V+ (up to 36V), enabling direct sensing of high-side voltages without level-shifting. |
| Rail-to-Rail Input and Output | Full signal utilization across entire supply range - critical for low-voltage battery systems (e.g., 3V coin cell). |
| Ultralow 2µA Supply Current | Reduces quiescent power to 6µW at 3V - extends battery life in portable instrumentation and remote sensors. |
| Low 375µV Max Offset Voltage | Minimizes DC error in precision gain stages; drift of only 0.4µV/°C ensures stability over temperature. |
| Reverse Battery Protection | Survives –18V supply without damage or latch-up - simplifies power management in field-deployed devices. |
| High CMRR and PSRR (90dB) | Rejects noise from shared supply rails and common-mode interference in noisy industrial environments. |
Applications
| Battery-Powered Sensor Front-End | Photodiode Signal Amplification |
|---|---|
|
Use Scenario: Amplifying µV-level output from a remote temperature or pressure sensor powered by a CR2032 coin cell. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail I/O and sub-2µA quiescent current. Use Value: Enables >10-year battery life while maintaining 12-bit linearity and immunity to supply sag during measurement bursts. |
Use Scenario: Converting nanoampere photocurrent from a silicon photodiode into a measurable voltage signal. IC Role / Device Role / Timing Role: Transimpedance amplifier with femtoampere input bias and low input capacitance. Use Value: Achieves 1.7kHz bandwidth and 260µs rise time with 10MΩ gain, minimizing dark-current-induced offset drift. |
| High-Impedance Electrochemical Sensing | Micropower Instrumentation Amplifier Core |
|
Use Scenario: Buffering high-output-impedance pH electrode or reference electrode in portable water-quality meters. IC Role / Device Role / Timing Role: Unity-gain buffer with 250pA input bias and 0.3V below ground input capability. Use Value: Prevents loading errors and preserves signal integrity when interfacing with >100MΩ electrode sources. |
Use Scenario: Building a 60µW, 3V-powered instrumentation amplifier for wearable biopotential monitoring. IC Role / Device Role / Timing Role: Precision gain stage in 3-op-amp IA topology, leveraging matched VOS and CMRR. Use Value: Delivers 65dB CMRR at 120Hz and total supply current of 12µA - meeting ultra-low-power medical sensor requirements. |
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; 10kHz GBW; same MS8 package. | Supports AV = 1 configurations (e.g., buffers, followers) where LT1672CMS8#PBF requires AV ≥ 5. | Select LT1494CS8#PBF when unity-gain operation is needed; otherwise LT1672CMS8#PBF offers higher GBW at same current. |
| LT1782IMS8#PBF | SOT-23-5 package; 55µA IS; 200kHz GBW; 800µV VOS max. | Higher speed and supply current; suited for faster sensor interfaces where power budget allows. | Choose LT1782IMS8#PBF for >100kHz signal paths; LT1672CMS8#PBF remains optimal for sub-20kHz, sub-2.5µA designs. |
Compared with LT1494CS8#PBF and LT1782IMS8#PBF, the LT1672CMS8#PBF uniquely balances 12kHz bandwidth, 2µA supply current, and Over-The-Top input capability - making it the only choice for precision, high-common-mode, micropower amplification where gain ≥5 is acceptable.
Availability
LT1672CMS8#PBF is available at Aetrix Electronics and suitable for battery-powered systems, remote sensor amplifiers, and micropower filter applications requiring stable component supply and long-term lifecycle support.
Supply support for LT1672CMS8#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 amps, including rigorous qualification and long-term reliability testing.
The LT1672CMS8#PBF belongs to Linear's Over-The-Top™ precision op amp family, engineered specifically for harsh-environment signal conditioning where inputs exceed the positive rail, supply voltage varies widely, and power budgets are constrained to microamps.
FAQ
What is the minimum operating supply voltage for LT1672CMS8#PBF?
The LT1672CMS8#PBF operates down to 2.2V (minimum specified), with functional operation confirmed at 2.1V. At 2.2V, it maintains full rail-to-rail input/output swing, 375µV max VOS, and 2µA max supply current - making it suitable for single-cell Li-ion (2.7–4.2V) and alkaline (1.5V×2) systems with headroom.
Does LT1672CMS8#PBF support single-supply operation with inputs below ground?
Yes. The LT1672CMS8#PBF accepts input common-mode voltages down to –0.3V relative to V–. When V– = 0V (single-supply configuration), inputs may go to –0.3V - sufficient for interfacing with transducers that swing slightly negative, such as certain bridge sensors or AC-coupled signals with DC bias.
Can LT1672CMS8#PBF drive capacitive loads?
The LT1672CMS8#PBF is stable driving ≤500pF at AV = 5 with output biased near mid-supply. However, if the output operates within 100mV of V+, allowable capacitance drops to <100pF at 30V supply. For heavier loads, an external isolation resistor (e.g., 10–50Ω) between output and capacitance is recommended.
What is the meaning of "Over-The-Top™" in LT1672CMS8#PBF?
"Over-The-Top™" denotes the LT1672CMS8#PBF's ability to accept input voltages exceeding the positive supply rail (V+) by up to 36V - achieved via a dual-differential-pair input stage. This enables direct high-side current sensing, battery voltage monitoring above regulator output, and fault-tolerant interface to industrial fieldbus signals without external level shifters.
Is LT1672CMS8#PBF pin-compatible with other op amps in the LT167x family?
No. The LT1672CMS8#PBF (single, MS8) uses a non-standard pinout with NC pins at 1, 6, and 8. The LT1673 (dual) and LT1674 (quad) have different pin assignments and package footprints. Direct replacement requires PCB redesign; only functional equivalence - not pin compatibility - applies across the LT167x series.
LT1672CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Over-The-Top®
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LT1672CMS8#PBF FAQ
1.How can I place an order for LT1672CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1672CMS8#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 LT1672CMS8#PBF reliable?
The price and inventory of LT1672CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1672CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1672CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1672CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1672CMS8#PBF?
LT1672CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1672CMS8#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 LT1672CMS8#PBF?
For technical support, including LT1672CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1672CMS8#PBF requirements.
6.How does Aetrix verify that LT1672CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1672CMS8#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 LT1672CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1672CMS8#PBF?
All LT1672CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1672CMS8#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 LT1672CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1672CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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