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Analog Devices Inc. LT1637HS8#PBF
- Part No.:
- LT1637HS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1637HS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,505
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Product details
Overview
LT1637HS8#PBF from Analog Devices (formerly Linear Technology) is a rugged, micropower, rail-to-rail input/output operational amplifier with Over-The-Top® input stage capability. It operates from 2.7V to 44V total supply, delivers 25mA output current, features shutdown mode (3µA quiescent), reverse supply protection to 25V, and supports inputs up to 44V above V– - enabling direct sensing in high-side battery monitoring and industrial current-sense applications.
For engineers reviewing the LT1637HS8#PBF datasheet, LT1637HS8#PBF pinout, LT1637HS8#PBF application, or LT1637HS8#PBF equivalent, this op amp is selected for precision overvoltage-tolerant signal conditioning where input common-mode range exceeds supply rails, low-power operation at extended temperature (–40°C to 125°C), and robust capacitive load driving (up to 4700pF with compensation).
Technical Context
The LT1637HS8#PBF employs a dual-input-stage architecture (NPN + PNP) enabling operation with inputs ≥44V above V– and ≥0.3V above V+, eliminating phase reversal down to 5V below V–. Its Over-The-Top® topology maintains high input impedance even when inputs exceed V+, supported by internal Schottky clamping and series 1.3kΩ resistors for fault protection to –22V relative to V–.
Internally compensated for ≥200pF, it achieves unity-gain stability into 4700pF with optional 0.22µF/150Ω output network. Shutdown is activated by pulling SHDN ≥1.2V above V–, reducing supply current to ≤15µA and output leakage to ≤5µA while preserving input bias <0.1nA across full common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Supply Voltage | 2.7V to 44V - supports single-supply industrial sensors and dual-supply instrumentation without level-shifting. |
| Input Common-Mode Range | –0.4V to 44V (relative to V–) - enables direct high-side current sensing and battery voltage monitoring above V+. |
| Output Drive Current | ±25mA min - drives heavy loads like MOSFET gates or 4–20mA transmitter circuits without external buffers. |
| Quiescent Current | 250µA max (active), ≤15µA (shutdown) - suitable for solar-powered or battery-backed systems requiring ultra-low standby power. |
| Gain-Bandwidth Product | 1.1MHz (typ) - sufficient for DC–100kHz closed-loop gain stages in precision sensor interfaces and supply monitors. |
| Slew Rate | 0.4V/µs (typ) - ensures stable step response in current-sense amplifiers and comparator hysteresis circuits. |
| Input Offset Voltage | 450µV max (–40°C to 125°C) - enables accurate low-level signal amplification in shunt-based current measurement. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive, industrial control, and harsh-environment monitoring. |
Pinout & Package
LT1637HS8#PBF is housed in an 8-lead plastic SO package (SO-8, JEDEC MS-012), with exposed pad not connected internally. Pin 1 is top-left corner (notch/dot marked), and the package is RoHS-compliant and lead-free.
| 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– without damage or phase reversal. |
| 3 (+IN) | Non-inverting input | Differential input node; same Over-The-Top® voltage tolerance as Pin 2; supports nulling via external 10kΩ pot between Pins 1 and 8. |
| 4 (V–) | Negative supply rail | Reference for all internal circuitry; reverse-battery protected to –25V; substrate diode to output requires current limiting if output driven below V–. |
| 5 (SHDN) | Shutdown control input | Active-high enable; ≥1.2V above V– activates shutdown (≤15µA IQ); tolerates up to +32V above V–; sinking capability supports open-drain logic interfacing. |
| 6 (OUT) | Amplifier output | Rail-to-rail swing (within ~15mV of rails); drives ≥25mA; supports 4700pF capacitive loads with external RC compensation network. |
| 7 (V+) | Positive supply rail | Bypass with 0.01µF ceramic capacitor within 25mm; additional 4.7µF electrolytic recommended for heavy load transients. |
| 8 (NULL) | No-connect terminal | Internally unused; electrically isolated; may be grounded for EMI reduction or left unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables input voltages > V+ (up to 44V above V–) without phase reversal or latch-up - critical for high-side current sensing and battery stack monitoring. |
| Rail-to-Rail Input & Output | Full dynamic range utilization across 2.7V–44V supplies; output swings within 15mV of rails at 5mA load - maximizes signal fidelity in low-voltage systems. |
| Reverse Supply Protection | Draws <1nA at –25V reverse supply - eliminates need for external blocking diodes in battery-powered equipment with polarity risk. |
| Shutdown Mode | Reduces supply current to ≤15µA and output leakage to ≤5µA while maintaining input bias <0.1nA - enables rapid power cycling in energy-constrained IoT nodes. |
| Capacitive Load Stability | Stable into ≥200pF inherently; supports up to 4700pF with optional 0.22µF/150Ω compensation - simplifies driving long cables or ADC input filters. |
| High CMRR & PSRR | 110dB CMRR (typ), 98dB PSRR (typ) - rejects noise from noisy power rails and common-mode interference in motor drive or industrial bus environments. |
Applications
| High-Side Current Sensing | Battery Stack Monitoring |
|---|---|
Use Scenario: Measuring load current in 12V–48V automotive or telecom power systems using a shunt resistor placed between source and load. IC Role / Device Role / Timing Role: Precision differential amplifier configured as current-sense amplifier with gain set by external resistors; inputs tolerate common-mode voltage > V+. Use Value: Eliminates need for isolated amplifiers or level-shifters; achieves ±0.5% current accuracy with 450µV max VOS over –40°C to 125°C. | Use Scenario: Monitoring individual cell voltages in multi-cell Li-ion or lead-acid battery packs where cell voltage exceeds system ground-referenced supply rails. IC Role / Device Role / Timing Role: High-input-impedance buffer and level translator that accepts cell voltage directly without attenuation or bias networks. Use Value: Supports direct connection to cells up to 44V above system ground; maintains 1.1MHz bandwidth for fast transient detection during charge/discharge cycles. |
| 4–20mA Transmitter Interface | Industrial Overvoltage-Tolerant Comparator |
Use Scenario: Converting sensor outputs (e.g., pressure, temperature) into standardized 4–20mA loop signals for PLC and DCS systems. IC Role / Device Role / Timing Role: Output driver stage with rail-to-rail swing and 25mA sourcing/sinking capability; used in Howland current source or voltage-controlled current sink topologies. Use Value: Drives full 20mA into 600Ω loop impedance at 24V supply; shutdown mode reduces loop current to <15µA for diagnostics or sleep states. | Use Scenario: Detecting lamp failure or open-circuit conditions in 24V–48V industrial lighting systems where input voltage can exceed supply rails during fault events. IC Role / Device Role / Timing Role: Over-The-Top® comparator with hysteresis, configured with external resistors to trigger at precise overvoltage thresholds. Use Value: Operates reliably with inputs up to 44V above V– while rejecting EMI; 0.4V/µs slew rate ensures clean edge transitions for digital logic interfacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, high-voltage, micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6081HS8#PBF | Lower VOS (125µV max), higher GBW (3.5MHz), but only 36V max supply and no Over-The-Top® input capability. | Preferred for low-offset, wide-bandwidth sensor front-ends where input stays within supply rails. | Select when precision offset and speed outweigh overvoltage tolerance requirements. |
| OPA192IDR | Higher precision (5µV VOS), rail-to-rail I/O, 36V supply, but lacks reverse supply protection and Over-The-Top® operation. | Better suited for high-accuracy data acquisition where common-mode range is constrained to supply rails. | Choose for metrology-grade DC performance where input voltage never exceeds V+. |
Compared with LTC6081HS8#PBF and OPA192IDR, the LT1637HS8#PBF uniquely supports inputs > V+ and reverse supply protection - making it irreplaceable in high-side sensing and battery-monitoring designs where fault tolerance and rail-exceeding operation are mandatory.
Availability
LT1637HS8#PBF is available at Aetrix Electronics and suitable for high-reliability industrial control, automotive battery management, and energy infrastructure applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1637HS8#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, serving industrial, automotive, communications, and healthcare markets.
The LT1637HS8#PBF belongs to ADI's legacy Linear Technology precision op amp portfolio, engineered specifically for ruggedized, high-voltage, micropower signal conditioning in harsh environments - emphasizing fault tolerance, wide supply range, and rail-exceeding input operation.
FAQ
What is the maximum input voltage tolerance for LT1637HS8#PBF relative to V–?
The LT1637HS8#PBF supports input voltages up to 44V above V–, regardless of V+ level - a defining feature of its Over-The-Top® architecture. This allows direct connection to high-side shunts or battery terminals without external level-shifting. Inputs are also protected down to –22V relative to V– via internal 1.3kΩ series resistors and clamp diodes.
Does LT1637HS8#PBF require external compensation for driving capacitive loads?
The LT1637HS8#PBF is internally compensated for stable operation with ≥200pF capacitive loads. For larger loads up to 4700pF - such as long PCB traces or ADC input filters - a 0.22µF capacitor in series with a 150Ω resistor must be added from OUT to ground. This network preserves phase margin and prevents oscillation without degrading DC accuracy.
What is the guaranteed operating temperature range for LT1637HS8#PBF?
The LT1637HS8#PBF is specified and tested over –40°C to +125°C ambient temperature. This H-grade qualification ensures reliable performance in under-hood automotive, industrial motor drives, and outdoor energy systems where thermal stress is severe. Electrical parameters including VOS, GBW, and output drive are guaranteed across this full range.
How does shutdown mode affect output state and leakage in LT1637HS8#PBF?
When LT1637HS8#PBF is placed in shutdown (SHDN ≥1.2V above V–), the output enters high-impedance state with leakage ≤5µA, and supply current drops to ≤15µA. Input bias remains <0.1nA, preserving high-impedance sensing integrity. The output does not float to mid-rail - it becomes effectively disconnected, allowing safe multiplexing or isolation in shared-bus configurations.
Can LT1637HS8#PBF be used in single-supply configurations with inputs near ground?
Yes - the LT1637HS8#PBF features true rail-to-rail input stage, allowing common-mode voltages from V– (ground) to V+ + 0.3V. In single-supply 3V or 5V systems, it accurately amplifies signals from 0V up to 44V referenced to V–, making it ideal for ground-referenced sensor interfaces and supply rail monitors where low-end linearity is critical.
LT1637HS8#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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1637HS8#PBF FAQ
1.How can I place an order for LT1637HS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1637HS8#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 LT1637HS8#PBF reliable?
The price and inventory of LT1637HS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1637HS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1637HS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1637HS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1637HS8#PBF?
LT1637HS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1637HS8#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 LT1637HS8#PBF?
For technical support, including LT1637HS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1637HS8#PBF requirements.
6.How does Aetrix verify that LT1637HS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1637HS8#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 LT1637HS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1637HS8#PBF?
All LT1637HS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1637HS8#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 LT1637HS8#PBF part is unused and in its original packaging.
Return procedure for LT1637HS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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