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Analog Devices Inc. LT1672IS8#TRPBF
- Part No.:
- LT1672IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1672IS8#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,509
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Product details
Overview
LT1672IS8#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, and 12 kHz gain bandwidth product while operating from 2.2 V to 36 V supplies. It is used in battery-powered sensor front-ends where input signals exceed the positive rail.
For engineers reviewing the LT1672IS8#TRPBF datasheet, LT1672IS8#TRPBF pinout, LT1672IS8#TRPBF application, or LT1672IS8#TRPBF equivalent, key selection criteria include micropower operation under ±15 V or single 5 V supply, reverse-battery protection to –18 V, rail-to-rail I/O swing, and guaranteed performance over –40°C to 85°C.
Technical Context
The LT1672IS8#TRPBF employs a three-stage architecture: a dual-differential-pair rail-to-rail input stage enabling operation above V+, a folded-cascode second stage delivering high open-loop gain (≥100 V/mV into 100 kΩ), and a common-emitter rail-to-rail output stage sourcing/sinking 500 µA. Its Over-The-Top™ topology allows inputs up to 36 V above V–, even when V+ is as low as 2.2 V.
It is decompensated for stable operation only at noise gain ≥5, distinguishing it from unity-gain-stable variants like the LT1494. Input bias current remains ≤250 pA (typical), and input offset voltage drift is specified at 0.4 µV/°C (typ), supporting precision DC-coupled signal conditioning in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2 µA max per amplifier - enables multi-year operation on coin-cell batteries in remote sensors. |
| Input Offset Voltage | 375 µV max at 25°C - ensures <0.1% gain error in 100× instrumentation amplifier configurations. |
| Gain Bandwidth Product | 12 kHz - supports stable filtering and amplification of sub-1 kHz sensor signals with noise gain ≥5. |
| Input Voltage Range | –0.3 V to 36 V - permits direct interfacing with photodiodes, thermocouples, or industrial 24 V signals without level-shifting. |
| Output Swing | VOH = V+ – 35 mV, VOL = 50 mV - achieves true rail-to-rail output into high-impedance loads for full ADC utilization. |
| Common Mode Rejection | 90 dB min - rejects power-supply ripple and ground noise in single-supply portable instrumentation. |
| Reverse Battery Protection | –18 V min - survives accidental battery reversal in automotive or solar-charged systems without external diodes. |
Pinout & Package
LT1672IS8#TRPBF is housed in an 8-lead plastic SO (S8) package, 3.9 mm × 4.9 mm, 1.27 mm pitch, with exposed pad not electrically connected. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or tied to GND for mechanical stability. |
| 2 (V+) | Positive Supply | Accepts 2.2 V to 36 V; reverse-battery protected to –18 V. |
| 3 (OUT) | Amplifier Output | Rail-to-rail capable; sources/sinks 500 µA; stable with ≤100 pF capacitive load at AV ≥ 5. |
| 4 (NC) | No Connect | Internally unused; must be left floating or tied to GND. |
| 5 (NC) | No Connect | Internally unused; must be left floating or tied to GND. |
| 6 (–IN) | Inverting Input | Over-The-Top™ enabled: operates up to 36 V above V–; input bias current ≤250 pA. |
| 7 (+IN) | Non-Inverting Input | Same Over-The-Top™ range and bias current spec as –IN; differential input voltage rating = 36 V. |
| 8 (V–) | Negative Supply / Ground | Reference for all inputs/outputs; common-mode range extends to –0.3 V below V–. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top™ Input Architecture | Enables input voltages > V+ (up to 36 V above V–), eliminating need for external level shifters in high-side sensing. |
| Ultralow 2 µA Supply Current | Reduces system quiescent power to ~60 µW at 5 V, critical for energy-harvesting and long-life battery applications. |
| Rail-to-Rail Input and Output | Maximizes dynamic range across full supply; supports single-supply operation down to 2.2 V with no headroom loss. |
| 100 V/mV Minimum Open-Loop Gain | Ensures <0.01% closed-loop gain error in precision gain stages with feedback resistors ≤1 MΩ. |
| Low 4 µVP-P (0.1–10 Hz) Input Noise | Preserves signal integrity in DC-coupled microvolt-level sensor amplification (e.g., thermopiles, strain gauges). |
Applications
| Battery-Powered Sensor Amplifier | Remote Photodiode Front-End |
|---|---|
Use Scenario: Amplifying low-level output from a temperature-compensated pressure sensor in a wireless IoT node powered by a CR2032 coin cell. IC Role / Device Role / Timing Role: Precision DC-coupled transducer amplifier with rail-to-rail output driving a 12-bit SAR ADC. Use Value: 2 µA supply current extends battery life beyond 10 years; Over-The-Top™ input accommodates sensor bias above V+ without external components. | Use Scenario: Converting photocurrent from an 880 nm IR photodiode in a low-power optical smoke detector. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10 MΩ gain and 1.7 kHz bandwidth, operating from ±1.2 V to ±15 V supplies. Use Value: 4 µVP-P low-frequency noise preserves signal-to-noise ratio; 250 pA input bias current avoids photodiode leakage-induced offset errors. |
| Micropower Filter Stage | High-Impedance Circuit Interface |
Use Scenario: Second-order active low-pass filter in a portable ECG monitor, rejecting 50/60 Hz mains interference. IC Role / Device Role / Timing Role: Deconvolved op amp configured as Sallen-Key topology with noise gain ≥5 for stability. Use Value: 12 kHz GBW enables precise cutoff at 100 Hz; rail-to-rail I/O maintains full signal swing across varying battery voltage. | Use Scenario: Buffering high-impedance pH electrode output (≥100 MΩ source impedance) in a handheld water quality tester. IC Role / Device Role / Timing Role: Unity-gain voltage follower with ultra-low input bias current to prevent electrode polarization. Use Value: 250 pA max input bias current limits voltage error to <25 µV across 100 MΩ source, preserving measurement accuracy. |
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 supply current; 425 µV max VOS; same Over-The-Top™ input range. | Supports gain-of-1 configurations (e.g., buffers) where LT1672IS8#TRPBF requires minimum noise gain of 5. | Select LT1494CS8#TRPBF when unity-gain stability is mandatory; otherwise LT1672IS8#TRPBF offers higher GBW (12 kHz vs 4.5 kHz) at slightly higher supply current. |
| OPA333AIDBVR | Zero-drift architecture; 17 µA supply current; 10 µV max VOS; no Over-The-Top™ input (CMR = V– to V+ – 0.1 V). | Superior DC accuracy for millivolt-level signals but cannot interface with inputs exceeding V+. | Select OPA333AIDBVR for ultra-low-offset, low-drift applications with conventional CMR; avoid where input signals exceed V+. |
Compared with LT1494CS8#TRPBF and OPA333AIDBVR, LT1672IS8#TRPBF uniquely balances ultralow power (2 µA), Over-The-Top™ input capability, and usable bandwidth (12 kHz) - making it optimal for high-side, battery-constrained, precision amplification where unity-gain stability is not required.
Availability
LT1672IS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered sensor amplifiers, remote photodiode front-ends, micropower filter stages, and high-impedance circuit interfaces requiring stable component supply across industrial and medical OEM programs.
Supply support for LT1672IS8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1672IS8#TRPBF belongs to Linear's Over-The-Top™ precision op amp family, designed specifically for ultralow-power, high-voltage-range signal conditioning in harsh, battery-limited environments such as portable instrumentation and remote sensing.
FAQ
What is the minimum supply voltage for stable operation of the LT1672IS8#TRPBF?
The LT1672IS8#TRPBF is specified for stable operation down to 2.2 V total supply voltage (V+ to V–). The minimum operating supply voltage is guaranteed at 2.2 V across the full –40°C to 85°C temperature range, with typical functionality observed down to 2.1 V. This enables use in single-cell Li-ion or alkaline systems where voltage sags below 2.5 V during discharge.
Can the LT1672IS8#TRPBF be used in unity-gain configurations?
No, the LT1672IS8#TRPBF is decompensated and unstable at unity gain. It requires a minimum noise gain of 5 for stable operation, as confirmed in its Electrical Characteristics table and Typical Performance plots. For unity-gain-stable alternatives with identical Over-The-Top™ capability, consider the LT1494CS8#TRPBF - a documented drop-in replacement in the same SO-8 package with 1.5 µA supply current.
What does "Over-The-Top™" mean for the LT1672IS8#TRPBF inputs?
"Over-The-Top™" means the LT1672IS8#TRPBF input stage operates correctly even when either input voltage exceeds the positive supply rail (V+) by up to 36 V relative to V–. This is achieved via internal dual-differential-pair topology and Schottky clamping. It enables direct high-side current sensing, photodiode biasing above V+, and interfacing with industrial 24 V signals without external level-shifting circuitry.
Is the LT1672IS8#TRPBF pin-compatible with other devices in the LT167x family?
No - the LT1672IS8#TRPBF (single) uses a nonstandard 8-pin SO pinout with three NC pins (1, 4, 5), differing from the standard dual op amp pinout used by LT1673IS8#TRPBF. It is also incompatible with LT1674 (quad) and MSOP-packaged variants. Pin compatibility exists only within the same channel count and package type (e.g., LT1672IS8#TRPBF ↔ LT1672CS8#TRPBF), not across family members.
How does reverse battery protection work on the LT1672IS8#TRPBF?
The LT1672IS8#TRPBF incorporates internal reverse-polarity protection circuitry that limits supply current to <100 nA when V– is driven 18 V more negative than V+. During this condition, inputs and outputs remain undamaged, and no external components are needed for basic protection in single-supply ground-referred circuits. If inputs or outputs go negative, external series resistors must limit pin current to <10 mA.
LT1672IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Over-The-Top®
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1672IS8#TRPBF FAQ
1.How can I place an order for LT1672IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1672IS8#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 LT1672IS8#TRPBF reliable?
The price and inventory of LT1672IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1672IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1672IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1672IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1672IS8#TRPBF?
LT1672IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1672IS8#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 LT1672IS8#TRPBF?
For technical support, including LT1672IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1672IS8#TRPBF requirements.
6.How does Aetrix verify that LT1672IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1672IS8#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 LT1672IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1672IS8#TRPBF?
All LT1672IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1672IS8#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 LT1672IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1672IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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