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Analog Devices Inc. LT1636CN8#PBF
- Part No.:
- LT1636CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1636CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:437
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Product details
Overview
LT1636CN8#PBF from Analog Devices (formerly Linear Technology) is a micropower rail-to-rail input/output operational amplifier with Over-The-Top® input stage enabling common-mode voltage operation up to 44V above VEE, independent of VCC. It delivers 18mA output drive, 225µV max input offset voltage (N8 package, –40°C to 85°C), 220kHz gain-bandwidth product, and operates from 2.7V to 44V total supply. It is used in battery monitoring, sensor conditioning, and high-side current sensing circuits where input voltage exceeds the positive rail.
For engineers reviewing the LT1636CN8#PBF datasheet, LT1636CN8#PBF pinout, LT1636CN8#PBF application, or LT1636CN8#PBF equivalent, key selection criteria include its 44V over-the-top input range, 50µA quiescent current, shutdown capability reducing IQ to 4µA, rail-to-rail I/O swing, and reverse battery protection to 27V - all in an 8-lead PDIP package rated for –40°C to 85°C operation.
Technical Context
The LT1636CN8#PBF employs a dual-input-stage architecture (PNP + NPN) that enables seamless operation across its full 0V to 44V input common-mode range relative to VEE, including voltages exceeding VCC. Its Over-The-Top® topology eliminates phase reversal when inputs go 5V below VEE or 44V above VEE.
It features internal compensation for stable unity-gain operation into capacitive loads up to 10,000pF using an external 0.22µF/150Ω network, and includes reverse-battery protection (≤1nA leakage at –27V) and built-in 1kΩ series input resistors for fault tolerance down to 22V below VEE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 44V total - supports single-supply industrial sensors and dual-supply ±15V instrumentation without redesign. |
| Quiescent Current | 50µA typical - enables multi-year battery life in portable instrumentation and remote monitoring nodes. |
| Input Offset Voltage | 225µV max (–40°C to 85°C, N8 package) - ensures <1mV error in precision 3V/5V supply current sensing. |
| Gain-Bandwidth Product | 220kHz - sufficient for DC–10kHz signal conditioning in sensor front-ends and 4–20mA transmitter loops. |
| Output Drive | 18mA - directly drives 500Ω loads or 10kΩ+ DAC buffers without external gain stages. |
| Common-Mode Input Range | Extends 44V above VEE, independent of VCC - enables direct high-side shunt measurement in 24V/48V systems. |
| Shutdown Current | 4µA - reduces system standby power in intermittently active sensor nodes or data loggers. |
Pinout & Package
LT1636CN8#PBF is housed in an 8-lead plastic DIP (PDIP-N8) package with 0.300-inch body width and through-hole mounting. Pin 1 is identified by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Null / Compensation | Connects to external 10kΩ potentiometer wiper for input offset nulling; unused if trimming not required. |
| 2 | Inverting Input (–IN) | Differential input node; accepts common-mode voltages from VEE to VEE + 44V, even above VCC. |
| 3 | Non-Inverting Input (+IN) | Differential input node; identical Over-The-Top® voltage range and bias current behavior as Pin 2. |
| 4 | Negative Supply (V–) | Reference for all input common-mode and output swing; underside metal pad (in DFN variants) connects here - not applicable to N8. |
| 5 | Shutdown (SHDN) | Active-high control: ≥1.2V above V– enables normal operation; ≤0.3V above V– places device in low-IQ shutdown mode. |
| 6 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking 18mA; remains stable into 10,000pF with external compensation. |
| 7 | Positive Supply (V+) | Accepts up to 44V above V–; reverse-battery protected to –27V (leakage <1nA). |
| 8 | Null / Compensation | Connects to one end of 10kΩ potentiometer for offset nulling; tied to V– when unused. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables reliable high-side current sensing in 24V/48V systems without level-shifting circuitry or supply dependency. |
| Rail-to-Rail Input and Output | Maximizes dynamic range in low-voltage (3V/5V) battery-powered systems while maintaining accuracy near supply rails. |
| Micropower Operation | 50µA IQ allows integration into energy-constrained IoT edge nodes and solar-powered telemetry devices. |
| Reverse Battery Protection | Withstands –27V supply faults with <1nA leakage - eliminates need for external blocking diodes in automotive/industrial power inputs. |
| Output Shutdown | Reduces system standby current by >90% (to 4µA), critical for duty-cycled sensor amplifiers and wake-on-event architectures. |
| Capacitive Load Drive | Stable into 10,000pF with optional 0.22µF/150Ω compensation - supports long cables, ADC input filters, and piezoelectric sensor interfaces. |
Applications
| Battery Monitoring | High-Side Current Sensing |
|---|---|
|
Use Scenario: Monitoring cell voltage and pack voltage in 12V–48V lead-acid or Li-ion battery systems with microcontroller-based BMS. IC Role / Device Role / Timing Role: Precision buffer and level translator for shunt-based current/voltage measurements referenced to battery positive terminal. Use Value: Eliminates need for isolated amplifiers or expensive high-voltage op amps; maintains 225µV offset accuracy across temperature while operating 44V above ground. |
Use Scenario: Measuring load current in industrial PLC outputs, motor drivers, or 4–20mA loop transmitters using high-side shunt resistors. IC Role / Device Role / Timing Role: Differential amplifier configured as current-sense amplifier with fixed gain, rejecting common-mode noise on high-voltage rails. Use Value: Direct interface to 24V/48V bus without level shifters; 110dB CMRR ensures accurate current reading despite bus ripple and switching noise. |
| Sensor Signal Conditioning | MUX Amplifier Front-End |
|
Use Scenario: Amplifying low-level signals from bridge-based pressure, strain, or temperature sensors in portable handheld instruments. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier front-end stage with rail-to-rail output driving SAR ADC inputs. Use Value: 52nV/√Hz input noise and 0.7µVP-P 0.1–10Hz noise enable sub-millivolt resolution; 18mA drive handles ADC input capacitance and ESD protection networks. |
Use Scenario: Multiplexed analog signal acquisition in data loggers where multiple sensors share a single ADC channel via analog switch array. IC Role / Device Role / Timing Role: Unity-gain buffer placed after multiplexer to isolate channel capacitance and prevent crosstalk during switching. Use Value: Fast 2.5µs turn-off time minimizes settling delay between channels; shutdown mode disables amplifier during inactive periods to reduce system power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail, micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1637CN8#PBF | Higher precision: 75µV max VOS (–40°C to 85°C), lower drift (1µV/°C), same Over-The-Top® architecture and 50µA IQ. | Preferred for ultra-low-error current sensing and precision reference buffering where offset budget is <100µV. | Select LT1637CN8#PBF when VOS and drift requirements exceed LT1636CN8#PBF's 225µV/5µV/°C spec; pin-compatible with identical PDIP-8 footprint. |
| AD8603ARZ-REEL7 | No Over-The-Top®: input common-mode limited to V– to V+ – 0.1V; 50µA IQ, 200µV max VOS, rail-to-rail I/O, no shutdown. | Suitable only for conventional low-side sensing or single-supply signal chains where inputs stay within supply rails. | Choose AD8603ARZ-REEL7 for cost-sensitive, non-overvoltage applications requiring same micropower and rail-to-rail performance - but requires layout changes to avoid overvoltage exposure. |
Compared with LT1636CN8#PBF, LT1637CN8#PBF offers tighter DC specs without sacrificing Over-The-Top® capability or power, while AD8603ARZ-REEL7 trades high-voltage input tolerance for lower unit cost and broader availability - making LT1636CN8#PBF the optimal balance of robustness, precision, and micropower in harsh industrial environments.
Availability
LT1636CN8#PBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, and sensor conditioning applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1636CN8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for industrial, automotive, communications, and healthcare markets.
The LT1636 family was designed specifically for precision, high-voltage, micropower signal conditioning in battery-operated and industrial equipment - emphasizing Over-The-Top® input operation, rail-to-rail swing, and robust fault tolerance.
FAQ
What is the maximum input common-mode voltage for LT1636CN8#PBF?
The LT1636CN8#PBF supports an input common-mode voltage range extending up to 44V above VEE, independent of VCC. This Over-The-Top® capability allows direct connection to high-side shunts in 24V or 48V systems without external level-shifting circuitry. The specification is guaranteed across the full –40°C to 85°C operating temperature range for the LT1636CN8#PBF variant.
Does LT1636CN8#PBF have shutdown functionality, and how does it behave?
Yes, LT1636CN8#PBF features an active-high shutdown pin (Pin 5). When driven ≥1.2V above VEE, the device operates normally with 50µA quiescent current. When pulled ≤0.3V above VEE, LT1636CN8#PBF enters shutdown mode, reducing supply current to 4µA and output leakage to <1µA. Input bias current drops below 0.1nA, preserving high-impedance sensing integrity during sleep cycles.
Can LT1636CN8#PBF drive large capacitive loads, and what compensation is required?
LT1636CN8#PBF is internally compensated for stability with ≥200pF loads. For capacitive loads up to 10,000pF (e.g., long cables or ADC input filters), an external 0.22µF capacitor in series with a 150Ω resistor must be connected between OUT and ground. This network ensures unity-gain stability across all output currents and supply voltages, as verified in the LT1636CN8#PBF datasheet Figure 12.
What is the guaranteed input offset voltage specification for LT1636CN8#PBF?
The LT1636CN8#PBF guarantees a maximum input offset voltage of 225µV over the –40°C to 85°C temperature range, specific to the N8 (PDIP) package. At 0°C to 70°C, the limit is tightened to 50µV min / 225µV max. This specification is measured under standard conditions (VS = 3V or 5V, VCM = VOUT = half-supply) and applies to both input pins with respect to VEE.
Is LT1636CN8#PBF protected against reverse battery connection?
Yes, LT1636CN8#PBF includes integrated reverse battery protection rated to –27V. Under reverse supply conditions, supply current remains below 100nA - effectively isolating the circuit without external diodes. This feature is intrinsic to the LT1636CN8#PBF silicon design and requires no additional components, simplifying power input protection in automotive and portable industrial equipment.
LT1636CN8#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:
- 0.075V/µs
- Gain Bandwidth Product:
- 220 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 50µA
- Current - Output / Channel:
- 30 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
LT1636CN8#PBF FAQ
1.How can I place an order for LT1636CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1636CN8#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 LT1636CN8#PBF reliable?
The price and inventory of LT1636CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1636CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1636CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1636CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1636CN8#PBF?
LT1636CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1636CN8#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 LT1636CN8#PBF?
For technical support, including LT1636CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1636CN8#PBF requirements.
6.How does Aetrix verify that LT1636CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1636CN8#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 LT1636CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1636CN8#PBF?
All LT1636CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1636CN8#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 LT1636CN8#PBF part is unused and in its original packaging.
Return procedure for LT1636CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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