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Analog Devices Inc. LT1637CN8#PBF
- Part No.:
- LT1637CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1637CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:355
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Product details
Overview
LT1637CN8#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 above V+. It delivers 25mA output drive, 1.1MHz gain-bandwidth, 0.4V/µs slew rate, and shutdown capability reducing quiescent current to 3µA. It is specified for –40°C to 85°C and housed in an 8-lead PDIP package - ideal for battery-powered sensor conditioning and high-side current sensing.
For engineers reviewing the LT1637CN8#PBF datasheet, LT1637CN8#PBF pinout, LT1637CN8#PBF application, or LT1637CN8#PBF equivalent, key selection criteria include its reverse supply protection to 25V, input common-mode range extending beyond V+, rail-to-rail output swing into 25mA loads, and guaranteed performance on 3V, 5V, and ±15V supplies without external compensation for ≤200pF loads.
Technical Context
The LT1637CN8#PBF employs a dual-input-stage architecture (NPN + PNP) enabling seamless operation across its full 0V to 44V input common-mode range relative to V–, including voltages exceeding V+ by ≥3V. Its Over-The-Top® topology eliminates phase reversal for inputs up to 5V below V– or 44V above V–, independent of VCC.
Internal compensation ensures stability driving ≥200pF capacitive loads; optional 0.22µF + 150Ω output network extends stable operation to 4700pF. Shutdown is activated by pulling SHDN ≥1.2V above V–, forcing output into high-impedance state and reducing supply current to 3µA while maintaining <0.1nA input bias current even under extreme common-mode conditions.
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 |
| Gain-Bandwidth Product | 1.1MHz - enables stable unity-gain operation with bandwidth sufficient for precision DC-coupled signal chains |
| Slew Rate | 0.4V/µs - supports fast settling for step inputs in current-sense and comparator applications |
| Input Offset Voltage | 350µV max (–40°C to 85°C) - ensures low error in precision amplification and monitoring circuits |
| Output Drive Current | 25mA min - directly drives LEDs, MOSFET gates, or 50Ω transmission lines without external buffers |
| Shutdown Quiescent Current | 3µA - enables ultra-low-power sleep modes in portable instrumentation and remote sensors |
| Input Common-Mode Range | –0.4V to 44V (relative to V–) - allows direct high-side sensing in 4–20mA transmitters and battery monitors |
| CMRR | 110dB - rejects noise in noisy industrial environments where common-mode interference is dominant |
Pinout & Package
LT1637CN8#PBF is packaged in an 8-lead plastic DIP (PDIP) with 0.300-inch body width and through-hole mounting. Pin 1 is identified by a notch or dot; leads are tin-lead plated per JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Unused internal node | No connection required; leave unconnected or tie to V– for mechanical stability |
| 2 (–IN) | Inverting input | Differential input terminal; accepts signals from –0.4V to 44V relative to V– |
| 3 (+IN) | Non-inverting input | Differential input terminal; same voltage range and Over-The-Top® capability as –IN |
| 4 (V–) | Negative supply rail | Reference for all voltages; reverse supply protected to 25V |
| 5 (SHDN) | Shutdown control input | Active-high: ≥1.2V above V– enables shutdown; tolerates up to 32V above V– |
| 6 (OUT) | Amplifier output | Rail-to-rail output capable of sourcing/sinking 25mA; high-Z in shutdown |
| 7 (V+) | Positive supply rail | Accepts 2.7V to 44V total supply; bypass with 0.01µF near pin |
| 8 (NULL) | Unused internal node | No connection required; leave unconnected or tie to V– |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables input operation ≥3V above V+ - critical for high-side current sensing without level-shifting |
| Rail-to-Rail Input and Output | Full dynamic range utilization on 3V single supply - maximizes ADC resolution in low-voltage systems |
| Reverse Battery Protection | Draws <1nA at –25V supply - eliminates need for external series diode in automotive/battery systems |
| Unity-Gain Stable w/ Compensation | Drives up to 4700pF with optional 0.22µF + 150Ω network - supports long cables or capacitive sensor interfaces |
| High Voltage Gain | 800V/mV (typ.) - provides >114dB open-loop gain for low-error closed-loop configurations |
| Wide Temperature Range | Specified from –40°C to +85°C - suitable for industrial and automotive under-hood environments |
Applications
| Battery Monitoring System | 4–20mA Transmitter |
|---|---|
Use Scenario: Monitoring cell voltage in multi-cell Li-ion packs with shared ground reference and varying stack voltages. IC Role / Device Role / Timing Role: High-side differential amplifier measuring voltage across sense resistor referenced to battery positive rail. Use Value: Over-The-Top® input allows direct sensing at up to 44V above system ground without isolation or level shifters. | Use Scenario: Converting sensor output (e.g., pressure, temperature) into industry-standard 4–20mA loop current. IC Role / Device Role / Timing Role: Precision current-output amplifier with rail-to-rail output driving loop transistor base. Use Value: 25mA output drive and 1.1MHz GBW enable fast, accurate current regulation with minimal external components. |
| Portable Instrumentation | MUX Amplifier Front-End |
Use Scenario: Signal conditioning in handheld multimeters or data loggers powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power, high-precision amplifier for sensor front-end with shutdown during idle periods. Use Value: 250µA operating current and 3µA shutdown current extend battery life while maintaining accuracy over temperature. | Use Scenario: Buffering multiplexed sensor channels before ADC sampling in medical or test equipment. IC Role / Device Role / Timing Role: Unity-gain buffer isolating MUX output from ADC input capacitance and ensuring fast settling. Use Value: 9µs 0.1% settling time and stability into 4700pF allow reliable operation with long PCB traces and switched-capacitor ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6078IS8#PBF | Lower supply current (55µA), lower offset (25µV), but only 150kHz GBW and no Over-The-Top® input | Not suitable for inputs above V+ or high-side sensing; limited to low-frequency precision apps | Select when ultra-low offset and power are critical, and input range stays within rails |
| OPA333AIDBVR | Zero-drift architecture (0.02µV/°C drift), 350kHz GBW, rail-to-rail I/O, but no reverse supply protection or Over-The-Top® | Cannot replace LT1637CN8#PBF in high-common-mode or reverse-battery scenarios | Choose for DC-accurate sensor amps where common-mode voltage remains bounded |
Compared with LTC6078IS8#PBF and OPA333AIDBVR, the LT1637CN8#PBF uniquely combines Over-The-Top® input operation, reverse supply protection, and 25mA output drive - making it irreplaceable in high-side current sensing, battery monitoring, and rugged industrial signal conditioning where voltage excursions exceed supply rails.
Availability
LT1637CN8#PBF is available at Aetrix Electronics and suitable for battery monitoring systems, 4–20mA transmitters, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1637CN8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1637 product line was designed by Linear Technology specifically for rugged, wide-supply, micropower operational amplification in harsh environments - targeting applications where inputs exceed supply rails, reverse polarity must be tolerated, and rail-to-rail output drive is essential.
FAQ
What is the maximum input voltage range supported by the LT1637CN8#PBF relative to V–?
The LT1637CN8#PBF supports an input common-mode voltage range from –0.4V to 44V relative to V–, including operation with inputs up to 44V above V– and ≥3V above V+. This Over-The-Top® capability is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables for the N8 package, enabling direct high-side sensing without level-shifting circuitry in the LT1637CN8#PBF.
Does the LT1637CN8#PBF require external compensation for driving capacitive loads?
The LT1637CN8#PBF is internally compensated and stable driving ≥200pF capacitive loads under all output conditions. For loads >200pF up to 4700pF, optional external compensation using a 0.22µF capacitor in series with a 150Ω resistor between OUT and GND is required - a configuration explicitly validated in the LT1637CN8#PBF datasheet's Typical Applications and Electrical Characteristics sections.
What is the shutdown behavior of the LT1637CN8#PBF, and how does it affect output impedance?
When the SHDN pin is driven ≥1.2V above V–, the LT1637CN8#PBF enters shutdown mode: supply current drops to 3µA, output leakage current falls below 1µA, and the output transitions to a high-impedance state. This behavior is measured and specified in the Electrical Characteristics table for the LT1637CN8#PBF across temperature, confirming true tri-state output functionality for multiplexed or shared-bus applications.
Can the LT1637CN8#PBF operate with a single 3V supply, and what are its rail-to-rail performance limits?
Yes, the LT1637CN8#PBF is fully specified for 3V single-supply operation. Its rail-to-rail input accepts signals from –0.4V to 44V relative to V–, and its output swings to within 3mV of V– and 60mV of V+ at 5mA load - verified in the 3V Electrical Characteristics table. These values are guaranteed for the LT1637CN8#PBF in the N8 package over –40°C to 85°C.
How does the LT1637CN8#PBF handle reverse supply conditions, and what is the leakage current?
The LT1637CN8#PBF features reverse supply protection up to 25V, drawing less than 1nA typical supply current under reverse-battery conditions (V+ < V–). This specification is explicitly listed in the Absolute Maximum Ratings and confirmed in the Electrical Characteristics table under "Reverse Supply Voltage" - a key differentiator enabling robust deployment in automotive and battery-powered systems where polarity reversal is possible.
LT1637CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Over-The-Top®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1637CN8#PBF FAQ
1.How can I place an order for LT1637CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1637CN8#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 LT1637CN8#PBF reliable?
The price and inventory of LT1637CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1637CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1637CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1637CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1637CN8#PBF?
LT1637CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1637CN8#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 LT1637CN8#PBF?
For technical support, including LT1637CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1637CN8#PBF requirements.
6.How does Aetrix verify that LT1637CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1637CN8#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 LT1637CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1637CN8#PBF?
All LT1637CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1637CN8#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 LT1637CN8#PBF part is unused and in its original packaging.
Return procedure for LT1637CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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