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Analog Devices Inc. LT1637IS8#PBF
- Part No.:
- LT1637IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1637IS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:476
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Product details
Overview
LT1637IS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, rail-to-rail input/output operational amplifier with Over-The-Top® input stage enabling operation with inputs up to 44V above V–, even on 3V supplies. It features 1.1MHz gain-bandwidth, 0.4V/µs slew rate, ±25mA output drive, shutdown capability (3µA quiescent current), and reverse supply protection to 25V. It is used in battery monitoring, high-side current sensing, and industrial sensor conditioning where wide common-mode range and low power are critical.
For engineers reviewing the LT1637IS8#PBF datasheet, LT1637IS8#PBF pinout, LT1637IS8#PBF application, or LT1637IS8#PBF equivalent, this page delivers verified specifications, package mapping, thermal performance data across –40°C to 125°C, real-world load-driving capability (25mA), and validated alternatives for precision analog signal conditioning in harsh-voltage environments.
Technical Context
The LT1637IS8#PBF employs a dual-input-stage architecture (NPN + PNP) that enables seamless operation across its full –0.4V to 44V input voltage range relative to V–, including inputs exceeding V+ - a key enabler for Over-The-Top® functionality. Its shutdown logic activates when the SHDN pin exceeds 1.2V above V–, forcing output into high-impedance state while reducing supply current to ≤3µA.
Internally compensated for ≥200pF capacitive loads, it supports optional external compensation (0.22µF + 150Ω) to drive up to 4700pF stably. Input bias current remains <0.1nA in shutdown, and reverse-battery protection limits current to <1nA at –25V supply, ensuring robustness in automotive and industrial power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Supply Voltage | 2.7V to 44V - supports single-supply operation down to 3V and high-voltage industrial rails without level-shifting. |
| Gain-Bandwidth Product | 1.1MHz - enables stable closed-loop gain of ≥10 at 100kHz for precision sensor amplification. |
| Slew Rate | 0.4V/µs - sufficient for 10kHz full-scale sine output at 4Vpp without distortion in low-power systems. |
| Input Offset Voltage | 350µV max (–40°C to 85°C) - ensures ≤1.4mV error in 4–20mA transmitter I/V conversion over temperature. |
| Output Drive Current | ±25mA min - directly drives 100Ω loads or 4–20mA loop transmitters without external buffers. |
| Shutdown Current | 3µA max - extends battery life in portable instrumentation during sleep modes. |
| Common-Mode Range | –0.4V to 44V (vs V–) - enables direct high-side current sensing in 24V/48V systems with no external resistors. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial control applications. |
Pinout & Package
LT1637IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 3.9mm × 4.9mm × 1.75mm, with gull-wing leads and JEDEC MS-012AC compliance. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | No-connect terminal | Internally unused; must be left floating or tied to ground per layout best practice. |
| 2 (–IN) | Inverting input | Differential node for feedback networks; supports common-mode voltages up to 44V above V–. |
| 3 (+IN) | Non-inverting input | High-impedance node (≥1MΩ) with Over-The-Top® operation; immune to phase reversal at V– –5V. |
| 4 (V–) | Negative supply rail | Reference for all internal circuitry; reverse-battery protected to –25V. |
| 5 (SHDN) | Shutdown control input | Active-high: ≥1.2V above V– disables output and reduces IQ to 3µA; tolerates up to +32V above V–. |
| 6 (OUT) | Amplifier output | Rail-to-rail capable; sources/sinks ±25mA; high-Z in shutdown with <1µA leakage. |
| 7 (V+) | Positive supply rail | Bypass with 0.01µF near pin; supports fast transient loads with optional 4.7µF bulk capacitor. |
| 8 (NULL) | No-connect terminal | Internally unused; leave unconnected or ground for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Operates with inputs up to 44V above V– on 3V supplies - eliminates need for external level shifters in high-side sensing. |
| Rail-to-Rail Input & Output | Full swing from V– to V+ on both input and output - maximizes dynamic range in low-voltage battery-powered systems. |
| Micropower Operation | 250µA max supply current - enables multi-year operation on coin cells in remote sensor nodes. |
| Reverse Supply Protection | Draws <1nA at –25V supply - prevents damage and system latch-up during battery misconnection. |
| Unity-Gain Stable w/ Compensation | Drives up to 4700pF with optional 0.22µF + 150Ω network - supports long-cable or capacitive-load interfaces without oscillation. |
| High CMRR & PSRR | 110dB CMRR, 98dB PSRR - rejects noise in noisy industrial 24V bus environments and maintains accuracy across supply ripple. |
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 telecom backup systems. IC Role / Device Role / Timing Role: Precision differential amplifier measuring cell voltage or pack voltage with inputs referenced to battery negative terminal. Use Value: Input range extending 44V above V– allows direct connection to battery positive without attenuators, preserving 350µV offset accuracy and minimizing BOM count. | Use Scenario: Measuring motor or solenoid current in industrial PLC outputs using shunt resistor on high-side of 24V supply. IC Role / Device Role / Timing Role: Single-supply current-sense amplifier rejecting common-mode voltage up to 44V while delivering rail-to-rail output to ADC. Use Value: Eliminates need for isolated amplifiers or expensive current sensors; ±25mA drive supports direct interface to SAR ADC reference buffers. |
| 4–20mA Transmitter | Over-The-Top Comparator |
Use Scenario: Loop-powered field transmitter converting RTD or pressure sensor output to industry-standard 4–20mA analog signal. IC Role / Device Role / Timing Role: Low-power op amp providing I/V conversion and loop regulation with shutdown for maintenance mode. Use Value: 3µA shutdown current extends loop power budget; rail-to-rail output ensures full 20mA compliance across 12–45V loop supply range. | Use Scenario: Detecting open-circuit conditions in 24V incandescent lamp strings used in building automation or signage. IC Role / Device Role / Timing Role: Comparator with built-in hysteresis operating with one input tied to lamp voltage and other to reference, both above V+. Use Value: Over-The-Top® input allows direct sensing of lamp voltage without level translation; 1.1MHz GBW ensures fast response to fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6078IMS8#PBF | Lower IQ (17µA), lower VOS (25µV), but only 150kHz GBW and ±10mA output drive; no Over-The-Top® input. | Best for ultra-low-power, low-speed precision DC circuits (e.g., pH sensors); unsuitable for high-voltage sensing or 4–20mA drive. | Select LTC6078IMS8#PBF only when microvolt-level offset and nanoamp bias dominate requirements, and input voltage stays within rails. |
| OPA2333AIDR | Zero-drift architecture (0.02µV/°C drift), 350kHz GBW, rail-to-rail I/O, but max VS = 5.5V and no reverse-supply protection. | Ideal for precision instrumentation on 3.3V/5V rails (e.g., medical ECG front-end); cannot replace LT1637IS8#PBF in 24V+ systems. | Choose OPA2333AIDR for sub-µV offset stability in low-voltage, low-noise DC applications - not for high-voltage or ruggedized use. |
Compared with LTC6078IMS8#PBF and OPA2333AIDR, the LT1637IS8#PBF uniquely combines 44V-over-V– input tolerance, 25mA output drive, and reverse-battery protection - making it irreplaceable in industrial current sensing and battery management where voltage range and robustness define system reliability.
Availability
LT1637IS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, and 4–20mA transmitter designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1637IS8#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 product continuity, qualification, and technical support for the LT1637 family.
The LT1637 series was designed specifically for ruggedized precision analog signal conditioning in high-common-mode-voltage environments - targeting industrial automation, automotive subsystems, and energy infrastructure where reliability under electrical stress is non-negotiable.
FAQ
What is the maximum input voltage range supported by the LT1637IS8#PBF?
The LT1637IS8#PBF supports an input common-mode voltage range from –0.4V to 44V relative to V–, enabling operation with inputs exceeding V+ - a feature known as Over-The-Top®. This allows direct high-side sensing in 24V/48V systems without attenuation or level-shifting circuitry, and is fully specified across its –40°C to 125°C operating temperature range.
Does the LT1637IS8#PBF require external compensation for driving capacitive loads?
The LT1637IS8#PBF is internally compensated for stable operation with ≥200pF capacitive loads. For larger loads up to 4700pF - such as long cables or ADC input capacitance - optional external compensation using a 0.22µF capacitor in series with a 150Ω resistor from output to ground is recommended and validated in the datasheet.
What is the shutdown behavior of the LT1637IS8#PBF, and how does it affect output impedance?
When the SHDN pin is driven ≥1.2V above V–, the LT1637IS8#PBF disables its output stage, placing the OUT pin in high-impedance state (<1µA leakage) while reducing supply current to ≤3µA. Input bias current drops below 0.1nA, preserving signal integrity in multiplexed or shared-bus configurations during sleep.
Can the LT1637IS8#PBF operate from a 3V single supply while maintaining rail-to-rail output swing?
Yes - the LT1637IS8#PBF delivers true rail-to-rail output swing on a 3V supply, achieving VOH ≥2.94V and VOL ≤8mV (no load) at room temperature. Its Over-The-Top® input stage also functions correctly at 3V, accepting inputs from –0.4V to 44V relative to V–, making it ideal for low-voltage portable equipment with wide input signal ranges.
Is the LT1637IS8#PBF pin-compatible with other packages in the LT1637 family?
The LT1637IS8#PBF (SO-8) shares identical pinout with LT1637CN8, LT1637CS8, LT1637IN8, LT1637HS8, and LT1637MPS8 - all follow the standard 8-pin SO/MSOP/DFN pin assignment: Pin 1/8 = NULL, Pin 2 = –IN, Pin 3 = +IN, Pin 4 = V–, Pin 5 = SHDN, Pin 6 = OUT, Pin 7 = V+. This enables drop-in replacement across temperature grades and packages without PCB redesign.
LT1637IS8#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:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1.1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 17 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 230µA
- Current - Output / Channel:
- 31.7 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1637IS8#PBF FAQ
1.How can I place an order for LT1637IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1637IS8#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 LT1637IS8#PBF reliable?
The price and inventory of LT1637IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1637IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1637IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1637IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1637IS8#PBF?
LT1637IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1637IS8#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 LT1637IS8#PBF?
For technical support, including LT1637IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1637IS8#PBF requirements.
6.How does Aetrix verify that LT1637IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1637IS8#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 LT1637IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1637IS8#PBF?
All LT1637IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1637IS8#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 LT1637IS8#PBF part is unused and in its original packaging.
Return procedure for LT1637IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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