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Analog Devices Inc. LT1637IN8#PBF
- Part No.:
- LT1637IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1637IN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:103
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Product details
Overview
LT1637IN8#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 delivers 1.1MHz gain-bandwidth, 0.4V/µs slew rate, ±25mA output drive, and shutdown capability reducing quiescent current to 3µA - ideal for battery-powered sensor conditioning and supply current sensing in industrial monitoring systems.
For engineers reviewing the LT1637IN8#PBF datasheet, LT1637IN8#PBF pinout, LT1637IN8#PBF application, or LT1637IN8#PBF equivalent, key selection criteria include its reverse-battery protection (25V), input common-mode range extending beyond V+, rail-to-rail output swing into 25mA loads, and guaranteed –40°C to 85°C operation in the 8-lead PDIP package.
Technical Context
The LT1637IN8#PBF employs a dual-input-stage architecture (NPN + PNP) enabling seamless operation across –0.4V to 44V input common-mode voltage, including voltages exceeding V+. Its Over-The-Top® topology eliminates phase reversal for inputs up to 5V below VEE or 44V above VEE, independent of VCC.
Internal compensation supports stable unity-gain operation into capacitive loads up to 4700pF when using optional 0.22µF + 150Ω output compensation. Shutdown is activated by pulling the SHDN pin ≥1.2V above V–, forcing output high-impedance and reducing supply current to ≤3µA while maintaining <0.1nA input bias current.
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 closed-loop gain up to ~100 at 10kHz for precision signal conditioning. |
| Slew Rate | 0.4V/µs - sufficient for 10kHz full-scale sine wave output at 2.5Vpp without distortion. |
| Input Offset Voltage | 350µV max (–40°C to 85°C) - ensures ≤1.75mV error in 5V full-scale 12-bit systems. |
| Output Drive Current | ±25mA min - directly drives 200Ω loads or 4–20mA transmitter circuits without external buffers. |
| Quiescent Current | 250µA max (active), 3µA max (shutdown) - extends battery life in always-on monitoring nodes. |
| Input Common-Mode Range | –0.4V to 44V - allows direct sensing of high-side currents or battery voltages above V+. |
| CMRR | 110dB - rejects >100k:1 common-mode interference in noisy industrial environments. |
Pinout & Package
The LT1637IN8#PBF is housed in an 8-lead PDIP (Plastic Dual In-line Package) with 0.300" body width and standard through-hole footprint. Thermal resistance θJA = 150°C/W enables operation at full rating without heatsinking below 50°C ambient.
| 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 input node; accepts common-mode voltages up to 44V above V–. |
| 3 (+IN) | Non-inverting input | Differential input node; same Over-The-Top® voltage range as Pin 2. |
| 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– enables shutdown mode (3µA IQ, high-Z output). |
| 6 (OUT) | Amplifier output | Rail-to-rail capable; sources/sinks ≥25mA; drives 4700pF with external compensation. |
| 7 (V+) | Positive supply rail | Accepts up to 44V total supply; bypass with 0.01µF ceramic + 4.7µF electrolytic for heavy loads. |
| 8 (NULL) | No-connect terminal | Internally unused; must be left floating or tied to ground per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables input operation up to 44V above V– on 3V supplies - critical for high-side current sensing without level-shifting. |
| Rail-to-Rail Input & Output | Full dynamic range utilization: inputs accept V– to V+, outputs swing within 3mV of rails at light loads - maximizes ADC resolution. |
| Reverse Battery Protection | Draws <1nA at –25V supply - prevents damage and system reset during field-reverse battery insertion. |
| Shutdown Mode | Reduces IQ to 3µA and output leakage to <1µA - enables µA-level sleep current in portable instrumentation. |
| Capacitive Load Drive | Stable into 4700pF with 0.22µF + 150Ω compensation - supports long-cable sensor interfaces or EMI-filtered outputs. |
| High Voltage Gain | 800V/mV (typ.) - provides >100dB open-loop gain for low-error closed-loop configurations at DC and low frequencies. |
Applications
| Battery Monitoring | Supply Current Sensing |
|---|---|
Use Scenario: Real-time measurement of Li-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: Precision buffer and level translator for ADC input, operating from 2.7V to 4.2V supply with inputs referenced to battery cathode. Use Value: Over-The-Top® input allows direct connection to battery terminals without resistive dividers, preserving accuracy and eliminating power loss. | Use Scenario: High-side current monitoring in 24V industrial PLC I/O modules with 4–20mA output drivers. IC Role / Device Role / Timing Role: Current-sense amplifier with gain-setting resistors, rejecting common-mode voltage up to 44V while driving transducer load. Use Value: 110dB CMRR and rail-to-rail output ensure <0.1% error over full temperature range despite 24V rail noise. |
| Over-The-Top Comparator | MUX Amplifier Front-End |
Use Scenario: Lamp outage detection in automotive lighting systems where input may exceed V+ during bulb cold-resistance surge. IC Role / Device Role / Timing Role: Comparator with hysteresis, biased from 5V rail but sensing 12V lamp voltage via Over-The-Top® inputs. Use Value: Eliminates need for external level-shifters or isolated supplies - reduces BOM count and PCB area by 30%. | Use Scenario: Signal conditioning front-end for 16-channel analog multiplexer in data acquisition systems. IC Role / Device Role / Timing Role: Low-drift, low-noise amplifier buffering mux outputs before ADC sampling. Use Value: 350µV max VOS and 27nV/√Hz noise floor maintain 14-bit ENOB across all channels without per-channel calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1490AIN8#PBF | Lower GBW (120kHz), no shutdown, wider VOS (1.5mV max), same Over-The-Top® input range. | Not suitable for bandwidth-critical current sensing; better for ultra-low-power comparator use without shutdown. | Select when shutdown and 1.1MHz bandwidth are unnecessary and cost is primary constraint. |
| ADA4091-2ARZ | Higher VOS (1.25mV max), lower drive (±10mA), no Over-The-Top® input (limited to V+ – 0.1V), includes rail-to-rail I/O. | Cannot sense above V+; requires level-shifting for high-side current monitoring above supply rail. | Select only for low-voltage (≤5.5V) applications where input voltage never exceeds V+. |
Compared with LT1490AIN8#PBF and ADA4091-2ARZ, the LT1637IN8#PBF uniquely combines shutdown, 1.1MHz bandwidth, ±25mA drive, and true Over-The-Top® input operation - making it the only option for high-voltage, low-power, rail-exceeding sensing in space-constrained PDIP layouts.
Availability
LT1637IN8#PBF is available at Aetrix Electronics and suitable for battery monitoring, supply current sensing, and Over-The-Top comparator applications requiring stable component supply across industrial temperature ranges.
Supply support for LT1637IN8#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 support, manufacturing, and qualification for legacy Linear parts including the LT1637 series.
The LT1637 product line was designed specifically for ruggedized precision amplification in harsh environments - targeting high-reliability industrial, automotive, and aerospace applications demanding wide supply range, reverse-battery immunity, and rail-exceeding input capability.
FAQ
What is the maximum input voltage range supported by the LT1637IN8#PBF?
The LT1637IN8#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– regardless of V+ level - a defining feature of its Over-The-Top® architecture. This is verified across –40°C to 85°C for the LT1637I grade and confirmed in Absolute Maximum Ratings and Electrical Characteristics tables.
Does the LT1637IN8#PBF require external compensation for driving capacitive loads?
The LT1637IN8#PBF is internally compensated for loads up to 200pF. For capacitive loads exceeding 200pF (up to 4700pF), external compensation using a 0.22µF capacitor in series with a 150Ω resistor from OUT to GND is required - as specified in the Applications Information section and validated in Typical Performance Characteristic Figure 1637 G20.
What is the guaranteed operating temperature range for the LT1637IN8#PBF?
The LT1637IN8#PBF is the Industrial-grade variant, guaranteed to operate from –40°C to +85°C across all electrical specifications. This is explicitly defined in the Ordering Information table and reinforced in Note 3 and Note 4 of the datasheet, distinguishing it from Commercial (C), High-Temp (H), and Military-Grade (MP) variants.
How does shutdown functionality work on the LT1637IN8#PBF?
Shutdown on the LT1637IN8#PBF is activated by raising the SHDN pin (Pin 5) to ≥1.2V above V–, reducing quiescent current to ≤3µA and placing the output in high-impedance state. The shutdown pin tolerates voltages up to 32V above V– and draws <15nA at 0.3V above V– - details confirmed in the Electrical Characteristics tables for LT1637I.
Can the LT1637IN8#PBF be used in single-supply 3V applications?
Yes - the LT1637IN8#PBF is fully specified and characterized for 3V single-supply operation (V+ = 3V, V– = 0V), with guaranteed parameters including 350µV max input offset voltage, 1.1MHz GBW, and rail-to-rail input/output swing. All key specs in the 3V column of the Electrical Characteristics tables apply to the LT1637IN8#PBF.
LT1637IN8#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1637IN8#PBF FAQ
1.How can I place an order for LT1637IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1637IN8#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 LT1637IN8#PBF reliable?
The price and inventory of LT1637IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1637IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1637IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1637IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1637IN8#PBF?
LT1637IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1637IN8#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 LT1637IN8#PBF?
For technical support, including LT1637IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1637IN8#PBF requirements.
6.How does Aetrix verify that LT1637IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1637IN8#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 LT1637IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1637IN8#PBF?
All LT1637IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1637IN8#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 LT1637IN8#PBF part is unused and in its original packaging.
Return procedure for LT1637IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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