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Analog Devices Inc. LT1638IMS8#TRPBF
- Part No.:
- LT1638IMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1638IMS8#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,457
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Product details
Overview
LT1638IMS8#TRPBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail input/output micropower operational amplifier in an 8-lead MSOP package, featuring Over-The-Top® operation with inputs up to 44V above V–, 1.2MHz gain bandwidth, 0.4V/μs slew rate, and 170μA per amplifier supply current. It operates from 2.5V to 44V total supply and is reverse-battery protected to 18V, enabling use in battery monitoring and high-side sensing circuits.
For engineers reviewing the LT1638IMS8#TRPBF datasheet, LT1638IMS8#TRPBF pinout, LT1638IMS8#TRPBF application, or LT1638IMS8#TRPBF equivalent, key selection criteria include its guaranteed –40°C to 85°C operating range, rail-to-rail output swing within 20mV of V+ and 3mV of V–, 98dB CMRR, and ability to drive ≥25mA loads while maintaining stability with optional compensation for up to 1000pF capacitive loads.
Technical Context
The LT1638IMS8#TRPBF integrates dual independent amplifiers with separate NPN and PNP input stages, enabling seamless Over-The-Top operation - inputs remain functional even when biased >44V above V– or >0.3V above V+. Its input stage includes phase reversal protection and internal 1kΩ series resistors for fault tolerance below V–.
Internally compensated for unity-gain stability, it delivers 1500V/mV large-signal voltage gain at 3V supply and maintains rail-to-rail output capability across load currents up to ±25mA. The MS8 package features exposed pad thermal enhancement (θJA = 273°C/W), supporting reliable operation in space-constrained industrial sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 44V total - supports single-supply 3V/5V systems and high-voltage industrial rails up to ±22V. |
| Quiescent Current | 170μA per amplifier - enables multi-year battery life in portable instrumentation and remote sensors. |
| Gain Bandwidth Product | 1.2MHz - sufficient for precision signal conditioning in 10kHz-bandwidth sensor interfaces and active filters. |
| Slew Rate | 0.4V/μs - ensures faithful reproduction of fast transients in supply current sensing and slope-limiting applications. |
| Input Common-Mode Range | –0.4V to 44V (single supply) - allows direct high-side voltage monitoring without level-shifting circuitry. |
| Output Drive Capability | ±25mA minimum - drives 2kΩ loads to full rail while maintaining rail-to-rail swing, critical for driving ADC reference buffers. |
| CMRR | 98dB - rejects power supply noise and common-mode interference in noisy industrial environments. |
Pinout & Package
LT1638IMS8#TRPBF is housed in an 8-lead plastic MSOP (MS8) package measuring 3.0mm × 3.0mm × 0.85mm, with exposed thermal pad internally connected to V– for enhanced heat dissipation (θJA = 273°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking ≥25mA into resistive or capacitive loads. |
| 2 (–IN A) | Inverting input A | Accepts common-mode voltages from –0.4V to 44V; includes internal 1kΩ series resistor for overvoltage protection. |
| 3 (+IN A) | Non-inverting input A | Same Over-The-Top capability as –IN A; phase reversal protection prevents false outputs during negative excursions. |
| 4 (V–) | Negative supply / ground reference | Internally connected to exposed thermal pad; reverse-battery protected to –18V with <1nA leakage. |
| 5 (V+) | Positive supply | Bypass with 0.1μF capacitor within 25mm; rise time must be ≤1V/μs for supplies ≥10V. |
| 6 (+IN B) | Non-inverting input B | Independent channel with identical Over-The-Top and rail-to-rail specifications as Channel A. |
| 7 (–IN B) | Inverting input B | Dual-channel isolation maintained; no crosstalk specified beyond 130dB channel separation at 1kHz. |
| 8 (OUT B) | Amplifier B output | Functionally identical to OUT A; enables dual-sensor conditioning or differential driver configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Operation | Inputs functional with voltages up to 44V above V– regardless of V+, enabling direct high-side sensing in 48V automotive or industrial bus monitoring. |
| Rail-to-Rail Input and Output | Full dynamic range utilization: input accepts signals from –0.4V to V+ + 0.3V; output swings within 20mV of V+ and 3mV of V– at no load. |
| Reverse Battery Protection | Draws <1nA supply current under –18V reverse supply - eliminates need for external blocking diodes in battery-powered equipment. |
| Low Power Consumption | 170μA per amplifier at 25°C - reduces self-heating in thermally sensitive applications and extends battery life in portable devices. |
| High Output Current | Guaranteed ±25mA drive capability - supports direct interfacing with low-impedance loads such as 2kΩ ADC reference dividers or LED drivers. |
| Unity-Gain Stable | Stable with all capacitive loads up to 200pF; optional RC compensation extends stability to 1000pF for long-cable or filter-stage applications. |
Applications
| Battery Monitoring System | High-Side Current Sensing |
|---|---|
|
Use Scenario: Real-time monitoring of 12V–48V lead-acid or Li-ion battery packs in UPS and energy storage systems. IC Role / Device Role / Timing Role: Dual op-amp configured as precision differential amplifier and buffer for cell voltage and pack voltage measurement. Use Value: Over-The-Top input allows direct connection to battery positive terminal without level shifters; rail-to-rail output ensures full ADC utilization. |
Use Scenario: Accurate measurement of motor or load current in industrial PLC I/O modules using shunt resistors on the high-side of the supply rail. IC Role / Device Role / Timing Role: Amplifier A performs high-common-mode rejection amplification of shunt voltage; Amplifier B buffers reference or provides gain staging. Use Value: Input range extending 44V above V– enables sensing at 48V bus levels; 98dB CMRR rejects switching noise from adjacent power converters. |
| Micropower Active Filter | 4mA–20mA Transmitter |
|
Use Scenario: Low-power anti-aliasing or reconstruction filtering in wireless sensor nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Dual-channel implementation of 2nd-order Sallen-Key or multiple-feedback topology with programmable cutoff frequency. Use Value: 1.2MHz GBW supports filter corner frequencies up to ~100kHz; 170μA quiescent current enables multi-year operation on 220mAh cells. |
Use Scenario: Industrial process control loop transmitter converting sensor voltage (e.g., RTD, strain gauge) to standardized 4mA–20mA current output. IC Role / Device Role / Timing Role: Amplifier A conditions sensor signal; Amplifier B serves as precision current source controller with feedback from sense resistor. Use Value: Rail-to-rail output drives transistor base/emitter with minimal headroom loss; reverse-battery protection ensures field-wiring robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1638CMS8#TRPBF | Same silicon, C-grade (0°C to 70°C guaranteed performance) vs. I-grade (–40°C to 85°C); lower max input offset voltage (200μV typ vs. 400μV typ). | Not qualified for extended temperature industrial environments; suitable only for commercial indoor applications. | Select LT1638IMS8#TRPBF for designs requiring guaranteed operation across –40°C to 85°C, especially in outdoor or uncontrolled ambient deployments. |
| ADA4077-2ARMZ | Lower input offset (10μV max), higher GBW (4MHz), but no Over-The-Top capability and narrower input range (–VS to +VS – 1.2V). | Cannot interface directly with high-side signals >V+; requires external level-shifting for battery monitoring above supply rail. | Choose ADA4077-2ARMZ only when ultra-low offset and speed outweigh Over-The-Top functionality and high-voltage input requirements. |
Compared with LT1638CMS8#TRPBF, the LT1638IMS8#TRPBF guarantees full specification compliance over –40°C to 85°C and offers superior input voltage range for high-side sensing; versus ADA4077-2ARMZ, it trades offset precision for unique Over-The-Top operation essential in industrial power monitoring.
Availability
LT1638IMS8#TRPBF is available at Aetrix Electronics and suitable for battery monitoring systems, high-side current sensing circuits, and micropower active filters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1638IMS8#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1638 product line was designed specifically for micropower, high-voltage, rail-to-rail signal conditioning in harsh environments - emphasizing Over-The-Top input operation, reverse-battery resilience, and wide supply flexibility from 2.5V to 44V.
FAQ
What is the maximum input voltage range supported by the LT1638IMS8#TRPBF?
The LT1638IMS8#TRPBF supports an input common-mode voltage range from –0.4V to 44V relative to V–, independent of V+. This Over-The-Top® capability allows both inputs to operate up to 44V above V– - for example, at V– = 0V and V+ = 5V, inputs may reach +44V. Absolute maximum differential input voltage is 44V. This makes the LT1638IMS8#TRPBF uniquely suited for high-side sensing in 48V systems without external level-shifting components.
Does the LT1638IMS8#TRPBF require external compensation for driving capacitive loads?
The LT1638IMS8#TRPBF is internally compensated and stable with capacitive loads up to 200pF under all output loading conditions. For loads exceeding 200pF - such as long cables or filter stages - optional external compensation is recommended: a 0.22μF capacitor in series with a 150Ω resistor between output and ground extends stability to 1000pF. This configuration preserves phase margin and prevents peaking or oscillation in the LT1638IMS8#TRPBF output stage.
How does reverse battery protection work in the LT1638IMS8#TRPBF?
The LT1638IMS8#TRPBF incorporates integrated reverse-battery protection that limits supply current to <1nA when V+ is reversed up to –18V relative to V–. This eliminates the need for external series diodes or MOSFETs in battery-powered equipment, preserving voltage headroom and reducing bill-of-materials cost. The protection remains active across the full –40°C to 85°C operating range and does not affect normal forward-operation parameters like input bias current or offset voltage.
Can the LT1638IMS8#TRPBF drive a 2kΩ load to full rail?
Yes - the LT1638IMS8#TRPBF guarantees ±25mA output current per amplifier, enabling it to drive a 2kΩ load to within 20mV of V+ and 3mV of V– at no load, and to maintain rail-to-rail swing even with 10mA sink/source current. At 5V supply, this means VOH ≥ 4.94V and VOL ≤ 500mV with 10mA load, making it suitable for driving ADC reference buffers, DAC output stages, and low-impedance sensor interfaces without external boost circuitry.
What is the guaranteed operating temperature range for the LT1638IMS8#TRPBF?
The LT1638IMS8#TRPBF is rated for guaranteed operation from –40°C to +85°C (I-grade). All electrical specifications - including input offset voltage (max 1550μV), supply current (max 280μA), gain bandwidth (min 650kHz), and CMRR (min 80dB) - are validated across this full industrial temperature range. This distinguishes it from the C-grade LT1638CMS8#TRPBF, which is only guaranteed from 0°C to 70°C and unsuitable for outdoor or thermally demanding deployments.
LT1638IMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 205µA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1638IMS8#TRPBF FAQ
1.How can I place an order for LT1638IMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1638IMS8#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 LT1638IMS8#TRPBF reliable?
The price and inventory of LT1638IMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1638IMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1638IMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1638IMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1638IMS8#TRPBF?
LT1638IMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1638IMS8#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 LT1638IMS8#TRPBF?
For technical support, including LT1638IMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1638IMS8#TRPBF requirements.
6.How does Aetrix verify that LT1638IMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1638IMS8#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 LT1638IMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1638IMS8#TRPBF?
All LT1638IMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1638IMS8#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 LT1638IMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1638IMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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