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Analog Devices Inc. LT1639IN#PBF
- Part No.:
- LT1639IN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1639IN#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
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Product details
Overview
LT1639IN#PBF from Analog Devices (formerly Linear Technology) is a quad rail-to-rail input and output operational amplifier with Over-The-Top® capability, enabling operation with inputs up to 44V above the negative supply - including above V+. It delivers 1.2MHz gain bandwidth, 0.4V/µs slew rate, and draws only 170µA per amplifier at 2.5V–44V total supply. Used in battery monitoring, sensor conditioning, and micropower active filters where wide common-mode range and rail-to-rail swing are critical.
For engineers reviewing the LT1639IN#PBF datasheet, LT1639IN#PBF pinout, LT1639IN#PBF application, or LT1639IN#PBF equivalent, key selection criteria include its reverse-battery protection to 18V, ±25mA output drive, 98dB CMRR, single-supply input range from –0.4V to 44V, and guaranteed operation across –40°C to +85°C in 14-pin PDIP packaging.
Technical Context
The LT1639IN#PBF integrates dual-input-stage architecture (NPN and PNP) to enable Over-The-Top operation: inputs remain functional even when driven >0.3V above V+, with phase reversal protection preventing false outputs during negative overvoltage events. Its input stage includes internal 1kΩ series resistors and clamp diodes for robustness against excursions below V–.
Internally compensated for stability with ≥200pF capacitive loads, it supports optional external compensation (0.22µF + 150Ω) to drive up to 1000pF. Unity-gain stable, it maintains rail-to-rail output swing (within 20mV of V+, 3mV of V–) while sourcing/sinking ≥25mA under specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1.2MHz typical - enables stable closed-loop operation up to ~1MHz with unity gain, suitable for precision DC-coupled and low-frequency AC signal conditioning. |
| Slew Rate | 0.4V/µs typical - supports clean amplification of signals with ≤400kHz full-power bandwidth at 1V output swing. |
| Supply Current per Amp | 170µA max at TA = 25°C - allows four-channel operation from coin-cell or energy-harvesting sources without compromising battery life. |
| Input Voltage Range | –0.4V to 44V on single supply - permits direct sensing of high-side voltages (e.g., 44V bus) without level-shifting or attenuation networks. |
| Output Drive | ±25mA min - drives heavy loads such as 200Ω instrumentation inputs or LED bias circuits without external buffers. |
| CMRR | 98dB typical - rejects common-mode noise in noisy industrial environments, preserving accuracy in differential measurements. |
| Reverse Battery Protection | Withstands –18V supply reversal with <1nA current draw - eliminates need for external protection diodes in automotive or portable battery systems. |
Pinout & Package
LT1639IN#PBF is housed in a 14-lead plastic PDIP package (N package), with exposed leads compatible with standard through-hole PCB assembly and wave soldering. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking ≥25mA into resistive or capacitive loads. |
| 2 (–IN A) | Inverting input A | Differential input node with 1kΩ series protection resistor; accepts voltages up to 44V above V– regardless of supply. |
| 3 (+IN A) | Non-inverting input A | Same Over-The-Top capability as Pin 2; enables high-side sensing configurations without external level shifters. |
| 4 (V–) | Negative supply rail | Reference for all four amplifiers; internally connected to exposed pad in DFN variants (not applicable to PDIP). |
| 5 (+IN C) | Non-inverting input C | Independent input for third amplifier; shares same Over-The-Top and phase-reversal protection features as Pins 2–3. |
| 6 (–IN C) | Inverting input C | Matched performance and protection to Pin 2; supports fully independent dual-opamp subsystems within one IC. |
| 7 (OUT C) | Amplifier C output | Electrically identical to Pin 1; allows simultaneous processing of multiple sensor channels in compact layouts. |
| 8 (V+) | Positive supply rail | Accepts 2.5V–44V total supply; bypassing with 0.1µF capacitor within 25mm is mandatory for stability. |
| 9 (OUT D) | Amplifier D output | Final output channel; enables 4-channel signal conditioning (e.g., multi-sensor front-end) without inter-chip routing delays. |
| 10 (–IN D) | Inverting input D | Provides fourth independent input path with full 44V common-mode tolerance and reverse-voltage resilience. |
| 11 (+IN D) | Non-inverting input D | Completes quad-input set; supports applications requiring four matched, isolated amplification paths. |
| 12 (V–) | Negative supply rail (redundant) | Second connection point to V–; improves grounding integrity in high-noise environments or long-trace layouts. |
| 13 (+IN B) | Non-inverting input B | Second amplifier's non-inverting input; enables differential pair usage (e.g., instrumentation amp configuration with Pins 2/3 and 13/14). |
| 14 (–IN B) | Inverting input B | Second amplifier's inverting input; completes pinout symmetry for consistent layout practices across all four channels. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Operation | Enables direct interface to signals exceeding V+ (up to 44V above V–), eliminating level-shifters in high-side current sensing and battery stack monitoring. |
| Rail-to-Rail Input and Output | Supports full dynamic range utilization on 3V, 5V, or ±15V supplies - maximizes ADC resolution and minimizes headroom loss in low-voltage systems. |
| Reverse Battery Protection | Draws <1nA at –18V supply reversal - removes need for external blocking diodes, reducing BOM count and forward-voltage drop in portable equipment. |
| Phase Reversal Protection | Prevents output inversion when inputs fall below V–, ensuring safe behavior in fault conditions like sensor disconnection or cable shorts. |
| Unity-Gain Stability with Capacitive Loads | Drives ≥200pF directly; optional RC network extends stability to 1000pF - simplifies driving long cables or LCD bias networks without oscillation risk. |
Applications
| Battery Monitoring | Sensor Conditioning |
|---|---|
Use Scenario: Real-time voltage measurement across individual cells in 12V–48V lead-acid or Li-ion battery packs, including top-cell monitoring where voltage exceeds system V+. IC Role / Device Role / Timing Role: Quad op-amp configured as four independent high-side differential amplifiers, each measuring cell voltage with Over-The-Top input tolerance. Use Value: Eliminates need for isolated power supplies or optocouplers per cell, reducing cost and board area by >40% versus discrete solutions. | Use Scenario: Amplifying low-level outputs from thermistors, strain gauges, and RTDs in industrial process control transmitters operating from 3.3V or 5V rails. IC Role / Device Role / Timing Role: Precision buffer and gain stage with rail-to-rail I/O, rejecting common-mode noise from 50/60Hz EMI and motor drives. Use Value: Achieves <10µV offset drift over temperature, enabling ±0.1°C thermal accuracy without calibration in field-deployed sensors. |
| Supply Current Sensing | 4mA to 20mA Transmitters |
Use Scenario: Measuring load current on positive supply rails up to 44V using a low-value shunt resistor, with output referenced to system ground. IC Role / Device Role / Timing Role: Current-sense amplifier topology using LT1639IN#PBF's Over-The-Top inputs to sense voltage across shunt while V+ powers downstream circuitry. Use Value: Enables single-supply design with no floating grounds or isolated amplifiers - reduces component count and improves long-term drift stability. | Use Scenario: Converting analog sensor outputs (e.g., pressure, temperature) into industry-standard 4–20mA loop signals for PLC interfacing in hazardous locations. IC Role / Device Role / Timing Role: Quad op-amp implements precision voltage-to-current conversion, loop-powered biasing, and HART modulation filtering in one package. Use Value: Supports full 4–20mA compliance over 0–1000Ω loop impedance with <0.05% linearity error, meeting IEC 61000-4-4 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2464IDR | Lower supply current (23µA vs 170µA), lower GBW (6.4MHz), no Over-The-Top capability, max supply 6V. | Optimized for ultra-low-power battery devices but unsuitable for >6V or high-side sensing. | Select TLV2464IDR only for sub-6V, nanowatt systems where Over-The-Top functionality is unnecessary. |
| AD8604ARUZ | Higher precision (150µV VOS max), higher GBW (8MHz), no Over-The-Top, max supply 6V, no reverse-battery protection. | Better for precision instrumentation below 6V; lacks high-voltage robustness and fault tolerance. | Choose AD8604ARUZ when offset voltage and bandwidth dominate requirements, and supply stays within 2.7–6V. |
Compared with TLV2464IDR and AD8604ARUZ, the LT1639IN#PBF uniquely supports 2.5–44V operation, Over-The-Top inputs, and reverse-battery protection - making it irreplaceable in industrial battery management, 24V/48V sensor interfaces, and harsh-environment transmitters where voltage range and fault resilience are non-negotiable.
Availability
LT1639IN#PBF is available at Aetrix Electronics and suitable for battery monitoring, sensor conditioning, and 4–20mA transmitter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1639IN#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 precision instrumentation, industrial automation, and power management.
The LT1639IN#PBF belongs to Linear Technology's legacy Over-The-Top® op amp family, engineered specifically for high-voltage single-supply applications demanding wide input common-mode range, rail-to-rail output swing, and intrinsic fault protection without external components.
FAQ
What is the maximum input voltage range supported by the LT1639IN#PBF?
The LT1639IN#PBF supports an input voltage range from –0.4V to 44V on single supply, and –15V to +29V on split supplies. Its Over-The-Top® architecture allows either or both inputs to operate up to 44V above V–, even exceeding V+ - a capability confirmed in the Absolute Maximum Ratings and Typical Applications sections of the official datasheet.
Does the LT1639IN#PBF require external compensation for driving capacitive loads?
The LT1639IN#PBF is internally compensated and stable with capacitive loads up to 200pF. For loads exceeding 200pF (up to 1000pF), optional external compensation using a 0.22µF capacitor in series with a 150Ω resistor between output and ground is recommended - a configuration validated in the Applications Information section of the LT1639 datasheet.
What is the operating temperature range for the LT1639IN#PBF?
The LT1639IN#PBF is rated for operation from –40°C to +85°C, as indicated by the "I" grade suffix in the part number and confirmed in the Absolute Maximum Ratings and Order Information tables. This range applies to both electrical performance specifications and reliability validation.
Can the LT1639IN#PBF be used in reverse-battery protection circuits?
Yes - the LT1639IN#PBF incorporates built-in reverse-battery protection and draws less than 1nA when subjected to –18V supply reversal. This feature eliminates the need for external series diodes in automotive, solar, or portable battery-powered systems, preserving efficiency and simplifying design.
How does the LT1639IN#PBF handle phase reversal during input overvoltage conditions?
The LT1639IN#PBF includes dedicated phase reversal protection circuitry that prevents output inversion when inputs fall below V–. This is achieved via internal design elements described in the Simplified Schematic and Applications Information - ensuring safe, predictable behavior during sensor faults or wiring errors without external clamping components.
LT1639IN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 205µA (x4 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LT1639IN#PBF FAQ
1.How can I place an order for LT1639IN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1639IN#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 LT1639IN#PBF reliable?
The price and inventory of LT1639IN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1639IN#PBF is usually 5 days.
3.What payment methods are accepted for LT1639IN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1639IN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1639IN#PBF?
LT1639IN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1639IN#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 LT1639IN#PBF?
For technical support, including LT1639IN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1639IN#PBF requirements.
6.How does Aetrix verify that LT1639IN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1639IN#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 LT1639IN#PBF meets industry standards.
7.What is the process for return or replacement of LT1639IN#PBF?
All LT1639IN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1639IN#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 LT1639IN#PBF part is unused and in its original packaging.
Return procedure for LT1639IN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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