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Analog Devices Inc. LT1672CMS8#TRPBF
- Part No.:
- LT1672CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1672CMS8#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,275
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Product details
Overview
LT1672CMS8#TRPBF 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 2 µA max supply current per amplifier, 375 µV max input offset voltage, 12 kHz gain bandwidth product, and operates from 2.2 V to 36 V supply. It is used in micropower photodiode amplifiers and remote sensor front-ends where input signals exceed the positive rail.
For engineers reviewing the LT1672CMS8#TRPBF datasheet, LT1672CMS8#TRPBF pinout, LT1672CMS8#TRPBF application, or LT1672CMS8#TRPBF equivalent, key selection criteria include guaranteed 2 µA max quiescent current at 25°C and –40°C to 85°C operation, rail-to-rail I/O swing, reverse battery protection to –18 V, and verified Over-The-Top input operation above V+.
Technical Context
The LT1672CMS8#TRPBF 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 delivering ±500 µA load current capability. Its input bias current remains ≤250 pA up to 10 V common-mode voltage, rising to ~180 nA only when inputs exceed V+.
It is decompensated for minimum gain of AV ≥ 5, ensuring stability in non-unity-gain configurations. The device maintains 90 dB PSRR and CMRR across 2.2 V to 12 V supplies and exhibits <0.4 µV/°C typical input offset drift - critical for precision DC-coupled sensing in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amplifier | 2 µA max at 25°C; enables multi-year battery life in always-on sensor nodes |
| Input Offset Voltage | 375 µV max (VS = 5 V); ensures ≤0.0375% error in 1 V full-scale instrumentation |
| Gain Bandwidth Product | 12 kHz at AV ≥ 5; supports stable filtering and amplification up to ~1.2 kHz at G = 10 |
| Rail-to-Rail Input Range | –0.3 V to 36 V (single supply); allows direct interfacing with transducers operating above V+ |
| Output Swing (RL = 100 kΩ) | VOH = V+ – 0.16 V, VOL = 410 mV; delivers >95% of supply range into moderate loads |
| Reverse Battery Protection | Withstands –18 V applied to V+; limits supply current to <100 nA during fault, eliminating external protection diodes |
| Input Bias Current | 250 pA max (25°C); enables use of >1 MΩ source impedances without significant offset error |
Pinout & Package
LT1672CMS8#TRPBF is housed in an 8-lead MSOP (MS8) package, 3.0 mm × 3.0 mm × 0.85 mm, with exposed pad for thermal enhancement and standard pinout compatible with industry-wide layout practices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Capable of sourcing/sinking 500 µA; rail-to-rail swing supports low-voltage signal chain integrity |
| 2 (–IN) | Inverting Input | High-impedance node (250 pA IB); accepts signals up to 36 V regardless of V+ level |
| 3 (+IN) | Non-inverting Input | Same Over-The-Top capability as –IN; enables high-side sensing without level-shifting |
| 4 (V–) | Negative Supply Rail | Supports single-supply (0 V reference) or split-supply (±15 V) operation |
| 5 (NC) | No Connect | Internally unused; must be left floating or tied to V– per layout guidelines |
| 6 (NC) | No Connect | Internally unused; no electrical function; avoid routing signals nearby |
| 7 (V+) | Positive Supply Rail | Accepts 2.2 V to 36 V; reverse-battery protected to –18 V |
| 8 (NC) | No Connect | Internally unused; do not connect to any net |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top™ Input Operation | Inputs functional up to 36 V even when V+ = 5 V - eliminates need for external level shifters in high-side current sensing |
| Ultralow Quiescent Current | 2 µA max per amplifier at 25°C and –40°C to 85°C - enables decade-long operation on coin cells |
| Precision DC Performance | 375 µV max VOS, 0.4 µV/°C typical drift, and 100 V/mV min AVOL - ensures stable gain accuracy over temperature and time |
| Rail-to-Rail Input & Output | Full dynamic range utilization from V– to V+ at both input and output - maximizes SNR in low-voltage systems |
| Reverse Battery Protection | Survives –18 V on V+ with <100 nA leakage - removes requirement for series Schottky diode in automotive/battery systems |
Applications
| Photodiode Amplifier | Remote Sensor Front-End |
|---|---|
|
Use Scenario: Amplifying weak current from 880 nm IR photodiode in optical smoke detectors or gas analyzers with ±1.2 V to ±15 V supplies. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10 MΩ gain, 1.7 kHz bandwidth, and 260 µs rise time - configured as precision DC-coupled current-to-voltage converter. Use Value: 4 µVP-P (0.1–10 Hz) input noise and 250 pA input bias enable sub-nA photocurrent resolution without active guarding. |
Use Scenario: Signal conditioning for thermistor or RTD bridges in wireless environmental sensors powered by solar-charged Li-ion cells. IC Role / Device Role / Timing Role: Precision buffer and gain stage in 3-wire ratiometric measurement circuits, operating continuously at 2 µA supply current. Use Value: 375 µV max offset and 90 dB CMRR suppress common-mode noise from long PCB traces and RF interference in unshielded enclosures. |
| Battery Current Monitor | Micropower Filter |
|
Use Scenario: High-side current sensing across 0.1 Ω shunt in portable medical devices with 5 V system rail and 12 V charging input. IC Role / Device Role / Timing Role: Differential amplifier with hysteresis comparator (using second LT1673 channel) for charge/discharge state detection. Use Value: Over-The-Top inputs accept 0–12 V common-mode while rejecting supply ripple; reverse-battery tolerance prevents latch-up during hot-swap events. |
Use Scenario: 2nd-order active low-pass filter in data loggers sampling temperature at 10 SPS with 3 V coin-cell supply. IC Role / Device Role / Timing Role: Dual-amplifier Sallen-Key topology (one LT1672 per stage) with G = 1, fc = 10 Hz - optimized for minimal power and phase distortion. Use Value: 12 kHz GBW and 0.4 µV/°C drift ensure accurate cutoff frequency stability across –40°C to 85°C without recalibration. |
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#TRPBF | Unity-gain stable; 1.5 µA max IS; 10 kHz GBW; same MS8 package | Supports G = 1 configurations (e.g., voltage follower) where LT1672CMS8#TRPBF requires AV ≥ 5 | Select LT1494 for unity-gain buffering; retain LT1672 for gain ≥ 5 to leverage higher GBW margin and lower noise |
| LTC2050CMS8#TRPBF | Zero-drift architecture; 1.5 µA IS; 3 µV max VOS; 1.5 MHz GBW; same MS8 footprint | Superior DC accuracy for <1 Hz applications (e.g., strain gauge), but higher current draw at high frequencies | Choose LTC2050 for ultra-low drift (<50 nV/°C) in static measurements; choose LT1672 for optimal µA/kHz efficiency in 1–10 kHz sensor interfaces |
Compared with LT1494CS8#TRPBF and LTC2050CMS8#TRPBF, LT1672CMS8#TRPBF offers the best trade-off of sub-2 µA quiescent current, Over-The-Top input headroom, and 12 kHz bandwidth - making it uniquely suited for high-common-mode, battery-constrained DC signal chains where unity-gain stability is not required.
Availability
LT1672CMS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, remote sensor amplifiers, and micropower filter designs requiring stable component supply across industrial and medical OEM programs.
Supply support for LT1672CMS8#TRPBF 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 its legacy precision analog portfolio with full datasheet compliance, long-term manufacturing commitment, and global distribution infrastructure.
The LT1672CMS8#TRPBF belongs to Linear's Over-The-Top™ micropower op amp family, engineered specifically for harsh-environment signal acquisition where inputs exceed supply rails and power budgets are constrained to single-digit microamps.
FAQ
What is the minimum supply voltage for reliable operation of the LT1672CMS8#TRPBF?
The LT1672CMS8#TRPBF operates down to 2.2 V (minimum specified), with functional performance confirmed at 2.1 V. At 2.2 V, it maintains 2 µA max supply current, 375 µV max input offset, and rail-to-rail output swing - making it viable for single-cell LiFePO₄ (2.5–3.6 V) and alkaline (2.4–3.2 V) battery systems. Below 2.2 V, parameters degrade progressively and are not guaranteed.
Can the LT1672CMS8#TRPBF drive capacitive loads, and what is the maximum stable value?
Yes, the LT1672CMS8#TRPBF can drive capacitive loads, but stability depends on output voltage and gain. With output biased at 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. For >100 pF loads, isolation resistor (10–100 Ω) between output and capacitor is recommended.
Does the LT1672CMS8#TRPBF require external protection against reverse battery connection?
No. The LT1672CMS8#TRPBF integrates reverse battery protection rated to –18 V on the V+ pin. Under this condition, supply current remains below 100 nA (inputs grounded, outputs open), and the device sustains no damage. External protection is unnecessary for standard single-supply applications with ground-referenced loads and feedback networks.
How does the Over-The-Top™ input feature work in the LT1672CMS8#TRPBF?
The LT1672CMS8#TRPBF uses a dual-differential-pair input stage. When common-mode voltage is below V+ – 0.8 V, the NPN pair (Q1–Q2) operates normally. Above that threshold, a PNP pair (Q5–Q6) activates via Q7/Q8 current steering, maintaining linear operation up to 36 V - even if V+ is only 3 V. This enables direct high-side sensing without external level shifters or resistive dividers.
Is the LT1672CMS8#TRPBF pin-compatible with other op amps in the MS8 package?
The LT1672CMS8#TRPBF follows the standard 8-pin MSOP pinout for single op amps (OUT, –IN, +IN, V–, NC, NC, V+, NC), matching footprints of LT1494CS8#TRPBF and LTC2050CMS8#TRPBF. However, due to its decompensated design (AV ≥ 5), it is not a drop-in replacement for unity-gain-stable parts - compensation network redesign may be required for G = 1 applications.
LT1672CMS8#TRPBF 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:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1672CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1672CMS8#TRPBF 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#TRPBF reliable?
The price and inventory of LT1672CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1672CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1672CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1672CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1672CMS8#TRPBF?
LT1672CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1672CMS8#TRPBF 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#TRPBF?
For technical support, including LT1672CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1672CMS8#TRPBF requirements.
6.How does Aetrix verify that LT1672CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1672CMS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1672CMS8#TRPBF?
All LT1672CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1672CMS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1672CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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