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Analog Devices Inc. LT1639CS#PBF
- Part No.:
- LT1639CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1639CS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,055
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Product details
Overview
LT1639CS#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 25mA output drive per amplifier while consuming only 170µA quiescent current per channel. It is widely used in battery monitoring, sensor conditioning, and 4mA–20mA transmitter circuits operating from 3V to ±22V supplies.
For engineers reviewing the LT1639CS#PBF datasheet, LT1639CS#PBF pinout, LT1639CS#PBF application, or LT1639CS#PBF equivalent, key selection considerations include its reverse-battery protection to 18V, single-supply input range of –0.4V to 44V, rail-to-rail output swing within 20mV of rails, no phase reversal behavior, and guaranteed performance over –40°C to +85°C in the 14-lead SO package.
Technical Context
The LT1639CS#PBF integrates dual NPN/PNP input stages to enable Over-The-Top operation: when inputs exceed V+, the Schottky-clamped NPN stage activates, maintaining functionality up to 44V common-mode voltage independent of supply. Its input stage includes built-in phase reversal protection and 1kΩ series resistors for robustness against sub-rail excursions.
This quad op amp is internally compensated for unity-gain stability and drives ≥200pF capacitive loads directly; optional RC compensation (0.22µF + 150Ω) extends stable operation to 1000pF. It features reverse-battery protection drawing <1nA under –18V reverse supply and operates across total supply voltages from 2.5V to 44V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1.2MHz typical - enables stable closed-loop operation up to ~1MHz at unity gain in precision DC-coupled and low-frequency AC signal paths. |
| Slew Rate | 0.4V/µs typical - supports clean 10kHz full-scale sine wave output at 4Vpp without slewing distortion. |
| Supply Current per Amplifier | 170µA typical - allows four-channel operation from coin-cell or energy-harvesting sources with <700µA total quiescent draw. |
| Input Common-Mode Range | –0.4V to 44V (single supply) - permits direct sensing of high-side currents or battery voltages exceeding V+. |
| Output Voltage Swing | Within 20mV of V+ and 3mV of V– (no load) - preserves dynamic range in low-voltage systems like 3.3V IoT nodes. |
| CMRR | 98dB typical - rejects power supply ripple and noise in precision instrumentation amplifiers and current-sense circuits. |
| Reverse Battery Protection | Up to 18V - eliminates need for external blocking diodes in automotive or portable equipment with unregulated battery inputs. |
Pinout & Package
LT1639CS#PBF is housed in a 14-lead plastic SOIC (SO-14) package with standard JEDEC outline, 1.27mm lead pitch, and exposed pad not present. The package is RoHS-compliant, lead-free, and rated for operation from –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Delivers rail-to-rail sourced/sunk current up to 25mA; requires optional RC compensation for >200pF capacitive loads. |
| 2 (–IN A) | Amplifier A inverting input | Accepts signals from –0.4V to 44V; includes internal 1kΩ series resistor and phase reversal protection. |
| 3 (+IN A) | Amplifier A non-inverting input | Same Over-The-Top voltage range as Pin 2; differential input voltage rating is ±44V. |
| 4 (V–) | Negative supply rail | Reference for all amplifiers; reverse-battery protected to –18V; internal metal pad connected to this pin in DFN variants (not applicable here). |
| 5 (+IN B) | Amplifier B non-inverting input | Independent channel with identical Over-The-Top and rail-to-rail specifications as Pins 2–3. |
| 6 (–IN B) | Amplifier B inverting input | Duplicate of Pin 2 functionality; supports high-common-mode sensor interfaces without level-shifting. |
| 7 (OUT B) | Amplifier B output | Electrically isolated output stage; shares V– (Pin 4) and V+ (Pin 14) with other channels. |
| 8 (OUT C) | Amplifier C output | Third independent output; enables multi-stage filtering or parallel drive in compact layouts. |
| 9 (–IN C) | Amplifier C inverting input | Supports same 44V-over-V– operation; critical for high-side current sensing in 4–20mA loop transmitters. |
| 10 (+IN C) | Amplifier C non-inverting input | Matches Pin 5; allows differential input configurations across multiple channels without external buffers. |
| 11 (V+) | Positive supply rail | Accepts 2.5V to 44V total supply; bypass with 0.1µF ceramic capacitor within 25mm for stability. |
| 12 (+IN D) | Amplifier D non-inverting input | Fourth channel input; enables quad-channel signal conditioning in space-constrained industrial modules. |
| 13 (–IN D) | Amplifier D inverting input | Full Over-The-Top capability; used in precision reference buffers where input may float above V+. |
| 14 (OUT D) | Amplifier D output | Final output stage; supports simultaneous sourcing/sinking across all four channels with <1mV crosstalk at 1kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Operation | Enables direct interface to 44V sensors or battery stacks without level-shifting, even when inputs exceed V+. |
| Rail-to-Rail Input and Output | Preserves full signal swing from –0.4V to 44V input and within 20mV of supply rails output - maximizes ADC utilization in low-voltage systems. |
| Reverse Battery Protection | Draws <1nA at –18V reverse supply - eliminates external protection diodes and associated voltage drop/power loss. |
| No Phase Reversal | Prevents false outputs during input transients below V–, critical for fault-tolerant sensor front-ends and safety-critical monitoring. |
| Unity-Gain Stable with Capacitive Load Support | Drives ≥200pF directly; optional 0.22µF + 150Ω network extends stability to 1000pF - simplifies driving long cables or ADC input filters. |
| Low Power / High Performance Trade-off | 170µA per amplifier at 1.2MHz GBW - achieves micropower efficiency without sacrificing bandwidth needed for fast-settling sensor interfaces. |
Applications
| Battery Monitoring System | 4–20mA Current Loop Transmitter |
|---|---|
|
Use Scenario: Real-time monitoring of 12V–48V lead-acid or Li-ion battery packs in UPS and solar charge controllers. IC Role / Device Role: Quad amplifier configured as high-side current sense, cell voltage monitor, temperature buffer, and reference regulator. Use Value: Over-The-Top inputs measure battery voltage directly at V+ node; rail-to-rail output drives 12-bit SAR ADCs with full-scale resolution. |
Use Scenario: Industrial process control transmitter converting RTD or pressure sensor output to standardized 4–20mA analog signal. IC Role / Device Role: Precision current source amplifier with programmable gain, offset correction, and loop-powered supply regulation. Use Value: Reverse-battery protection ensures field wiring faults won't damage circuitry; 25mA output drive sustains loop compliance over 1kΩ load. |
| Portable Sensor Signal Conditioning | Micropower Active Filter |
|
Use Scenario: Low-power gas or environmental sensor interface in battery-operated handheld analyzers. IC Role / Device Role: Quad op amp implementing programmable-gain instrumentation amplifier, anti-alias filter, reference buffer, and ADC driver. Use Value: 170µA per channel enables 4-channel analog front-end with <700µA total IQ - extends coin-cell life beyond 1 year. |
Use Scenario: ECG or vibration sensor front-end requiring sharp cutoff and minimal phase distortion in wearable medical devices. IC Role / Device Role: Quad amplifier configured as 2-pole Sallen-Key low-pass filter with tunable cutoff and rail-to-rail output swing. Use Value: 1.2MHz GBW supports 100Hz filter design with >60dB stopband attenuation; no external compensation needed for PCB trace capacitance. |
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 GBW (6.4MHz), higher supply current (550µA/ch), no Over-The-Top capability; input range limited to V– to V+ – 0.2V. | Not suitable for high-side sensing above V+ or reverse-battery environments; better for higher-speed, AC-coupled signal chains. | Select when bandwidth >1MHz is required and input voltage stays within rails; avoid for battery monitor or industrial field wiring. |
| OPA4340UA | Similar GBW (1.2MHz) and rail-to-rail I/O, but no Over-The-Top operation; max input voltage = V+ + 0.3V; no reverse-battery protection. | Lacks 44V common-mode tolerance and reverse-supply immunity - requires external protection circuitry in harsh environments. | Use where cost is prioritized and system-level protection is already implemented; verify input clamping diodes are present. |
Compared with TLV2464IDR and OPA4340UA, the LT1639CS#PBF uniquely supports true Over-The-Top inputs and reverse-battery survival - making it irreplaceable in unregulated battery-fed systems where input voltage may exceed V+ or polarity may be reversed during maintenance.
Availability
LT1639CS#PBF is available at Aetrix Electronics and suitable for battery monitoring, 4–20mA transmitter design, and portable sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1639CS#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.
The LT1639CS#PBF belongs to Linear Technology's precision rail-to-rail op amp family, engineered for micropower operation in harsh industrial and portable environments where input overvoltage, reverse polarity, and wide supply ranges are common.
FAQ
What is the maximum input voltage the LT1639CS#PBF can tolerate relative to V–?
The LT1639CS#PBF supports an absolute maximum input voltage of 44V above V–, regardless of V+ level. This Over-The-Top® capability is confirmed in the Absolute Maximum Ratings table and enables direct connection to high-side current shunts or battery terminals without external level-shifting circuitry. The LT1639CS#PBF maintains functional operation and avoids phase reversal even when inputs exceed V+ by up to 44V.
Does the LT1639CS#PBF require external compensation for driving capacitive loads?
The LT1639CS#PBF is internally compensated and stable driving ≥200pF capacitive loads under all conditions. For loads exceeding 200pF - such as long cables or ADC input filters - optional external compensation using a 0.22µF capacitor in series with a 150Ω resistor between output and ground extends stable operation to 1000pF. This configuration is validated in the Applications Information section and does not degrade DC accuracy or noise performance of the LT1639CS#PBF.
What is the guaranteed operating temperature range for the LT1639CS#PBF?
The LT1639CS#PBF is specified and guaranteed over the commercial temperature range of –40°C to +85°C. This is explicitly stated in the Order Information table for the "CS" suffix (14-Lead Plastic SO) and confirmed in the Electrical Characteristics tables labeled "LT1639C/LT1639I". The device is characterized for full parameter compliance across this range, including input offset voltage, CMRR, and output drive capability - ensuring reliability in industrial and outdoor embedded applications.
Can the LT1639CS#PBF operate from a single 3V supply?
Yes, the LT1639CS#PBF operates from a minimum total supply voltage of 2.5V and is fully specified at 3V single supply. Key parameters - including rail-to-rail input range (–0.4V to 44V), output swing (within 20mV of V+ and 3mV of V–), and 1.2MHz GBW - are guaranteed at 3V. Its 170µA per amplifier quiescent current makes it ideal for ultra-low-power 3V systems such as wireless sensor nodes and portable medical devices using the LT1639CS#PBF.
How does reverse battery protection work on the LT1639CS#PBF?
The LT1639CS#PBF incorporates internal reverse-battery protection circuitry that limits supply current to <1nA when V+ is reversed relative to V– by up to 18V. This eliminates the need for external series diodes in automotive or field-deployed equipment where accidental polarity reversal may occur during battery replacement or maintenance. The protection is active without external components and preserves functionality of all four amplifiers once normal polarity is restored - a key reliability feature of the LT1639CS#PBF.
LT1639CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1639CS#PBF FAQ
1.How can I place an order for LT1639CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1639CS#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 LT1639CS#PBF reliable?
The price and inventory of LT1639CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1639CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1639CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1639CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1639CS#PBF?
LT1639CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1639CS#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 LT1639CS#PBF?
For technical support, including LT1639CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1639CS#PBF requirements.
6.How does Aetrix verify that LT1639CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1639CS#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 LT1639CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1639CS#PBF?
All LT1639CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1639CS#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 LT1639CS#PBF part is unused and in its original packaging.
Return procedure for LT1639CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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