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Analog Devices Inc. LT1639CS#TRPBF
- Part No.:
- LT1639CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1639CS#TRPBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,404
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Product details
Overview
LT1639CS#TRPBF from Analog Devices (formerly Linear Technology) is a quad rail-to-rail input and output operational amplifier optimized for micropower, high-voltage single-supply operation. It delivers 1.2MHz gain bandwidth, 0.4V/µs slew rate, ±25mA output drive, reverse battery protection to 18V, and Over-The-Top® input capability enabling operation with inputs up to 44V above V– - ideal for battery monitoring and supply current sensing in industrial sensor interfaces.
For engineers reviewing the LT1639CS#TRPBF datasheet, LT1639CS#TRPBF pinout, LT1639CS#TRPBF application, or LT1639CS#TRPBF equivalent, key selection criteria include its 170μA per-amplifier quiescent current, rail-to-rail I/O swing on 2.5V–44V supplies, 98dB CMRR, 44V input common-mode range, and 14-pin SO package compatibility with space-constrained analog front-ends.
Technical Context
The LT1639CS#TRPBF integrates four independent amplifiers sharing a common dual-supply or single-supply rail architecture. Its Over-The-Top® input stage combines NPN and PNP differential pairs, enabling valid operation when either input exceeds V+ by up to 0.3V or sits as low as –0.4V relative to V–, with internal phase reversal protection and 1kΩ series input resistors for fault tolerance.
Each amplifier features unity-gain stability, drives ≥200pF capacitive loads natively, and supports optional compensation (0.22µF + 150Ω) for stable operation up to 1000pF. The device draws only 170μA per amplifier at 25°C and maintains specified performance across –40°C to +85°C without supply sequencing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1.2MHz - enables stable closed-loop gain up to 12 at 100kHz for precision signal conditioning |
| Slew Rate | 0.4V/µs - supports ≤400kHz full-power bandwidth for 1VPP signals without distortion |
| Supply Current per Amp | 170μA - allows continuous operation for >1 year on a single CR2032 coin cell in portable instrumentation |
| Input Common-Mode Range | –0.4V to 44V - permits direct sensing of battery voltages up to 44V with no level-shifting circuitry |
| Output Drive Capability | ±25mA - drives 200Ω loads while maintaining rail-to-rail swing, eliminating external buffers in 4–20mA transmitter outputs |
| CMRR | 98dB - rejects >99.9% of common-mode noise in noisy industrial environments (e.g., motor drives) |
| Reverse Battery Protection | 18V - survives accidental reverse connection in automotive and solar-battery systems without external diodes |
Pinout & Package
LT1639CS#TRPBF is housed in a 14-lead plastic SO (Small Outline) package with exposed pad thermal enhancement. Pin 1 is marked with a dot; the package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A Output | Full rail-to-rail swing (within 20mV of V+, 3mV of V–) with ±25mA sourcing/sinking capability |
| 2 (–IN A) | Amplifier A Inverting Input | Protected by 1kΩ series resistor; handles –0.4V to 44V common-mode voltage |
| 3 (+IN A) | Amplifier A Non-Inverting Input | Same Over-The-Top® input structure as Pin 2; phase reversal protected |
| 4 (V–) | Negative Supply Rail | Internally connected to exposed pad; reverse-battery protected up to –18V |
| 5 (+IN C) | Amplifier C Non-Inverting Input | Independent input stage identical to Pins 2/3; supports multi-channel sensor buffering |
| 6 (–IN C) | Amplifier C Inverting Input | Matches Pin 2 functionality; enables differential pair configuration for channel C |
| 7 (OUT C) | Amplifier C Output | Electrically identical to Pin 1; shares same output drive specs and load capability |
| 8 (V+) | Positive Supply Rail | Bypass with 0.1µF capacitor within 25mm; supports total supply up to 44V |
| 9 (OUT D) | Amplifier D Output | Fourth independent output; enables 4-channel active filtering or multi-sensor conditioning |
| 10 (–IN D) | Amplifier D Inverting Input | Matches Pins 2/6; supports configurable gain stages across all four amps |
| 11 (+IN D) | Amplifier D Non-Inverting Input | Enables unity-gain buffer or differential configurations for channel D |
| 12 (V–) | Negative Supply Rail (redundant) | Second V– connection improves grounding in high-noise layouts; internally tied to Pin 4 |
| 13 (+IN B) | Amplifier B Non-Inverting Input | Completes fourth amplifier's input pair; supports independent biasing per channel |
| 14 (–IN B) | Amplifier B Inverting Input | Final input terminal; enables full quad configuration with individual feedback networks |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Operation | Enables direct interface to 44V battery rails or industrial sensors without external level shifters or clamps |
| Rail-to-Rail Input and Output | Maximizes dynamic range on low-voltage (2.5V) or high-voltage (44V) supplies, preserving ADC resolution |
| Reverse Battery Protection | Eliminates need for external series diodes in portable equipment, reducing voltage drop and power loss |
| Quad Amplifier Integration | Reduces PCB area and component count in multi-channel applications like 4–20mA transmitters or sensor arrays |
| Unity-Gain Stable with Capacitive Loads | Drives long cables or ADC input capacitance (≤200pF) without oscillation or external compensation |
Applications
| Battery Monitoring System | 4–20mA Current Loop Transmitter |
|---|---|
Use Scenario: Real-time monitoring of 12V–44V lead-acid or Li-ion battery packs in UPS and solar charge controllers. IC Role / Device Role / Timing Role: Quad amplifier configured as differential voltage monitor, current sense amplifier, temperature compensator, and reference buffer. Use Value: Over-The-Top® inputs measure battery voltage directly without attenuation; rail-to-rail output drives ADC with full-scale utilization. | Use Scenario: Industrial process control loop transmitting sensor data over 1km twisted-pair cable. IC Role / Device Role / Timing Role: One amplifier conditions sensor signal, another serves as precision current source, third provides loop power regulation, fourth buffers reference. Use Value: ±25mA output drive sustains 20mA loop current into 1kΩ load; 170μA quiescent current minimizes self-heating in sealed enclosures. |
| Portable Instrumentation Front-End | Micropower Active Filter Bank |
Use Scenario: Handheld multimeter or environmental sensor node powered by coin-cell battery. IC Role / Device Role / Timing Role: Four independent amplifiers implement programmable gain, anti-aliasing filter, offset correction, and display driver interface. Use Value: 170μA per amplifier enables >10,000 measurements per CR2032 cell; rail-to-rail I/O preserves signal fidelity at 3V supply. | Use Scenario: Low-noise ECG or vibration sensor signal conditioning requiring selectable 2nd-order low-pass response. IC Role / Device Role / Timing Role: Each amplifier implements one pole of cascaded Sallen-Key topology with tunable cutoff frequency. Use Value: 1.2MHz GBW supports 100kHz filter design; unity-gain stability eliminates need for external compensation components. |
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), lower GBW (6.4MHz), no Over-The-Top® input (max VCM = V+ – 0.2V) | Not suitable for >5V battery monitoring or high-side current sensing above V+ | Select TLV2464IDR only for ultra-low-power, low-voltage (<5.5V) applications where Over-The-Top® capability is unnecessary |
| AD8604ARUZ | Higher supply current (240μA), higher GBW (8MHz), rail-to-rail I/O but no reverse-battery protection or 44V input tolerance | Lacks robustness in automotive or industrial environments with supply transients or polarity faults | Choose AD8604ARUZ when higher speed and precision offset (65μV max) outweigh need for fault protection and wide VCM |
Compared with TLV2464IDR and AD8604ARUZ, LT1639CS#TRPBF uniquely combines micropower operation, 44V Over-The-Top® input tolerance, reverse-battery protection, and rail-to-rail output swing - making it irreplaceable in high-reliability battery-powered industrial sensing where supply integrity cannot be assumed.
Availability
LT1639CS#TRPBF is available at Aetrix Electronics and suitable for battery monitoring systems, 4–20mA transmitters, portable instrumentation, and micropower active filters requiring stable component supply across extended temperature ranges.
Supply support for LT1639CS#TRPBF 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1639CS#TRPBF belongs to ADI's legacy Linear Technology precision op amp portfolio, engineered specifically for micropower, high-voltage, rail-to-rail signal conditioning in harsh or battery-constrained environments.
FAQ
What is the maximum input common-mode voltage for LT1639CS#TRPBF?
The LT1639CS#TRPBF supports an input common-mode voltage range from –0.4V to 44V relative to V–, enabling direct measurement of battery voltages up to 44V without external level-shifting circuitry. This Over-The-Top® capability is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet, with operation verified across the full –40°C to +85°C temperature range.
Does LT1639CS#TRPBF require external compensation for driving capacitive loads?
LT1639CS#TRPBF is internally compensated and stable driving up to 200pF capacitive loads under all conditions. 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 required - a configuration validated in the Applications Information section of the LT1638/LT1639 datasheet.
Can LT1639CS#TRPBF operate with a single 3V supply?
Yes, LT1639CS#TRPBF operates fully specified on single supplies from 2.5V to 44V, including 3V. At 3V, it maintains rail-to-rail input and output swing, 170μA per amplifier supply current, and 1.2MHz gain bandwidth - making it suitable for coin-cell-powered portable instrumentation where low-voltage operation is critical.
What is the reverse battery protection rating of LT1639CS#TRPBF?
LT1639CS#TRPBF provides reverse battery protection up to 18V, meaning it withstands –18V applied to V+ while drawing less than 1nA supply current. This feature is explicitly documented in the Absolute Maximum Ratings table and Applications Information section, eliminating the need for external protection diodes in automotive and solar-battery applications.
Is LT1639CS#TRPBF pin-compatible with other quad op amps in SO-14 packages?
No, LT1639CS#TRPBF has a unique pinout optimized for its Over-The-Top® architecture and quad layout - including dual V– pins (Pins 4 and 12) and interleaved input/output assignments. It is not pin-compatible with standard quad op amps like LM324 or TLV2464; PCB layout must follow the exact LT1639CS#TRPBF pin configuration shown in the datasheet's Pin Configuration diagram.
LT1639CS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1639CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1639CS#TRPBF 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#TRPBF reliable?
The price and inventory of LT1639CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1639CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1639CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1639CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1639CS#TRPBF?
LT1639CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1639CS#TRPBF 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#TRPBF?
For technical support, including LT1639CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1639CS#TRPBF requirements.
6.How does Aetrix verify that LT1639CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1639CS#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1639CS#TRPBF?
All LT1639CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1639CS#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1639CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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