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Analog Devices Inc. LT1637CS8#PBF
- Part No.:
- LT1637CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1637CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:9,749
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Product details
Overview
LT1637CS8#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– and ≥3V below V+, ±15V or single 3V–44V supply support, 1.1MHz gain-bandwidth, 0.4V/µs slew rate, and shutdown capability reducing quiescent current to 3µA. It drives 25mA loads and operates across –40°C to 85°C in industrial sensor conditioning and battery monitoring.
For engineers reviewing the LT1637CS8#PBF datasheet, LT1637CS8#PBF pinout, LT1637CS8#PBF application, or LT1637CS8#PBF equivalent, key selection criteria include input voltage range beyond rails, reverse supply protection to 25V, shutdown leakage <1µA, rail-to-rail output swing into 25mA, and stability with 4700pF capacitive load using optional compensation.
Technical Context
The LT1637CS8#PBF integrates dual-input-stage architecture (NPN/PNP) enabling seamless operation across –0.4V to 44V common-mode range relative to V–, with no phase reversal for inputs 5V below V– or 44V above V–. Its Over-The-Top® input stage remains high-impedance even when inputs exceed V+.
Internal compensation ensures unity-gain stability into ≥200pF; optional 0.22µF + 150Ω network extends stable capacitive load drive to 4700pF. Shutdown control via SHDN pin (pin 5) reduces supply current to 3µA while maintaining high-impedance output and sub-nA input bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Supply Voltage | 2.7V to 44V - supports wide-range single-supply (e.g., 3V battery, 24V industrial bus) or split-supply (±15V) operation without derating. |
| Gain-Bandwidth Product | 1.1MHz - enables stable closed-loop gain ≥10 at 100kHz for precision signal conditioning in sensor front-ends. |
| Slew Rate | 0.4V/µs - sufficient for 10kHz full-scale sine wave output at 4Vpp without distortion in low-power transmitters. |
| Input Offset Voltage | 350µV max (–40°C to 85°C) - ensures ≤0.7mV error in 20-bit 5V ADC reference buffers or current-sense amplifiers. |
| Output Drive Current | 25mA min - directly interfaces with 4–20mA transmitter loads, LED drivers, or multiplexer output stages without external buffers. |
| Shutdown Current | 3µA max - extends battery life in portable instrumentation by >98% versus active mode (250µA). |
| Reverse Supply Protection | 25V - eliminates need for external diode in automotive or solar-battery systems subject to polarity reversal. |
| Input Common-Mode Range | –0.4V to 44V (vs V–) - enables direct sensing of 44V battery stacks or industrial 24V supply rails without level-shifting. |
Pinout & Package
LT1637CS8#PBF is housed in an 8-lead plastic SO package (S8), 5.0mm × 4.0mm × 1.5mm body, JEDEC MS-012AC compliant, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Null / Not Connected | No internal connection; left unconnected or used for offset nulling (with external 10k pot to V–). |
| 2 | Inverting Input (–IN) | Differential input node; accepts voltages from –0.4V to 44V relative to V–; protected to –22V below V–. |
| 3 | Non-Inverting Input (+IN) | Differential input node; identical voltage range and protection as –IN; enables Over-The-Top® operation above V+. |
| 4 | Negative Supply (V–) | Ground or negative rail return; substrate diode to output requires current limiting if output driven below V–. |
| 5 | Shutdown (SHDN) | Active-high enable; ≥1.2V above V– activates op amp; ≤0.3V above V– places device in shutdown (3µA IQ). |
| 6 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking 25mA; high-impedance in shutdown; drives 4700pF with external RC compensation. |
| 7 | Positive Supply (V+) | Positive rail input; bypass with 0.01µF ceramic capacitor within 25mm; reverse-protected to 25V. |
| 8 | Null / Not Connected | No internal connection; unused pin; may be grounded for EMI reduction but not required. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Operates with inputs up to 44V above V– regardless of V+ level - enables direct high-side current sensing in 48V systems without attenuators. |
| Rail-to-Rail Input & Output | Full dynamic range utilization on 3V supplies - preserves SNR in low-voltage portable sensors and extends usable ADC input range. |
| Micropower Operation | 250µA max supply current - allows continuous operation for years on coin-cell batteries in remote IoT sensor nodes. |
| Reverse Battery Protection | Draws <1nA at –25V reverse supply - eliminates external protection diodes in automotive and backup power applications. |
| Capacitive Load Stability | Stable into 4700pF with optional 0.22µF + 150Ω compensation - supports long-cable driving and LCD bias generation without oscillation. |
| Wide Temperature Range | Specified from –40°C to 85°C - qualified for industrial automation, outdoor metering, and under-hood automotive subsystems. |
Applications
| Battery Monitoring System | 4–20mA Transmitter |
|---|---|
Use Scenario: Real-time voltage measurement of 12V–48V lead-acid or Li-ion battery packs in UPS or EV auxiliary systems. IC Role / Device Role / Timing Role: Precision differential amplifier measuring cell stack voltage with inputs referenced to pack negative terminal. Use Value: Input range extending 44V above V– enables direct high-side sensing without level shifters, reducing BOM count and offset drift. | Use Scenario: Converting 0–5V sensor outputs (e.g., pressure, temperature) into industry-standard 4–20mA loop currents. IC Role / Device Role / Timing Role: Current-output transconductance amplifier with rail-to-rail output driving 25mA into 250Ω load. Use Value: 25mA drive capability eliminates external transistor stage, simplifying layout and improving thermal stability over temperature. |
| Over-The-Top Comparator | Supply Current Sensing |
Use Scenario: High-voltage comparator detecting open-circuit conditions in 24V–44V lighting or motor circuits with hysteresis. IC Role / Device Role / Timing Role: Comparator with hysteresis using Over-The-Top® inputs to sense voltages above V+ (e.g., lamp voltage vs reference). Use Value: No external level-shifting needed for inputs >V+, enabling direct interface to 44V lamp strings while maintaining fast response (<5µs turn-off time). | Use Scenario: Measuring load current in 3.3V–24V embedded systems using low-value shunt resistors (e.g., 0.2Ω). IC Role / Device Role / Timing Role: High-side current-sense amplifier with input common-mode range including V+ and rail-to-rail output. Use Value: Single-supply operation with inputs up to V+ allows placement on high-side of shunt, avoiding ground disturbance in sensitive analog subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1490ACS8#PBF | Lower GBW (175kHz), higher IQ (450µA), no shutdown, same Over-The-Top® input range. | Lacks shutdown; unsuitable for battery-powered intermittent sensing; better for always-on low-frequency precision. | Select when ultra-low offset (125µV max) is critical and shutdown is unnecessary. |
| ADA4077-2ARZ | Higher precision (15µV VOS), lower noise (7.9nV/√Hz), but narrower input range (±13.5V), no Over-The-Top®, no shutdown. | Cannot sense above V+ or handle 44V CM range; requires dual supply; suited for lab-grade instrumentation only. | Select for high-accuracy DC-coupled measurement where input voltage stays within rails and power is not constrained. |
Compared with LT1490ACS8#PBF and ADA4077-2ARZ, the LT1637CS8#PBF uniquely combines micropower shutdown, Over-The-Top® input operation, and 25mA output drive-making it the only choice for battery-powered high-voltage sensing and 4–20mA loop transmission in space-constrained industrial designs.
Availability
LT1637CS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, 4–20mA transmitter design, and high-side current sensing requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1637CS8#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 its precision analog portfolio, emphasizing high-reliability, high-performance signal conditioning ICs for industrial, automotive, and medical markets.
The LT1637CS8#PBF belongs to Linear's Over-The-Top® op amp family, designed specifically for high-voltage, single-supply applications where inputs exceed the positive rail-targeting battery management, industrial current loops, and ruggedized sensor interfaces.
FAQ
What is the maximum input voltage range supported by the LT1637CS8#PBF relative to V–?
The LT1637CS8#PBF supports an input common-mode voltage range from –0.4V to 44V relative to V–, verified across –40°C to 85°C. This enables direct sensing of 44V battery stacks or 24V industrial rails without attenuation. The Over-The-Top® architecture ensures functionality even when inputs exceed V+, with no phase reversal up to 44V above V–.
Can the LT1637CS8#PBF drive a 4700pF capacitive load stably?
Yes, the LT1637CS8#PBF can drive up to 4700pF stably when configured with the recommended external compensation network: a 0.22µF capacitor in series with a 150Ω resistor connected between OUT and ground. Without this network, the device is internally compensated for ≥200pF. This capability supports long-cable interfaces and LCD bias applications without oscillation.
What is the shutdown current consumption of the LT1637CS8#PBF, and how is shutdown activated?
The LT1637CS8#PBF draws ≤3µA quiescent current in shutdown mode. Shutdown is activated by pulling the SHDN pin (pin 5) to ≥1.2V above V–; deactivation occurs when SHDN falls ≤0.3V above V–. During shutdown, output becomes high-impedance and input bias current drops below 0.1nA - critical for preserving battery charge in portable LT1637CS8#PBF-based systems.
Does the LT1637CS8#PBF require external components for basic operation, and what are the mandatory bypass requirements?
Yes, the LT1637CS8#PBF requires a 0.01µF ceramic bypass capacitor placed within 25mm of the V+ pin to ensure stability. For heavy-load operation (>10mA), an additional 4.7µF electrolytic capacitor is recommended. No external compensation is needed for loads ≤200pF; the 0.22µF + 150Ω network is optional and only required for >200pF capacitive loads.
How does the LT1637CS8#PBF achieve reverse supply protection, and what is its rating?
The LT1637CS8#PBF incorporates internal circuitry that limits supply current to <1nA when subjected to reverse supply voltages up to –25V, verified per Absolute Maximum Ratings. This eliminates the need for external reverse-polarity protection diodes in automotive, solar, or battery-powered systems - reducing board area, forward voltage drop, and thermal dissipation.
LT1637CS8#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1637CS8#PBF FAQ
1.How can I place an order for LT1637CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1637CS8#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 LT1637CS8#PBF reliable?
The price and inventory of LT1637CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1637CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1637CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1637CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1637CS8#PBF?
LT1637CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1637CS8#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 LT1637CS8#PBF?
For technical support, including LT1637CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1637CS8#PBF requirements.
6.How does Aetrix verify that LT1637CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1637CS8#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 LT1637CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1637CS8#PBF?
All LT1637CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1637CS8#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 LT1637CS8#PBF part is unused and in its original packaging.
Return procedure for LT1637CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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