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Analog Devices Inc. LT1639IS#TRPBF
- Part No.:
- LT1639IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1639IS#TRPBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,362
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Product details
Overview
LT1639IS#TRPBF 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 or 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 range. It is used in battery monitoring, sensor conditioning, and 4mA–20mA transmitter circuits where high-voltage common-mode tolerance and micropower operation are critical.
For engineers reviewing the LT1639IS#TRPBF datasheet, LT1639IS#TRPBF pinout, LT1639IS#TRPBF application, or LT1639IS#TRPBF equivalent, key selection criteria include its ±15V-compatible rail-to-rail I/O, reverse-battery protection to 18V, 25mA output drive, 98dB CMRR, and guaranteed operation from –40°C to +85°C in the 14-lead SO package.
Technical Context
The LT1639IS#TRPBF integrates dual complementary input stages (NPN and PNP), enabling seamless Over-The-Top operation - inputs function correctly even when exceeding V+ by up to 0.3V, with typical input bias current of 8µA in that region. Its phase reversal protection prevents false outputs when inputs fall below V–, and internal 1kΩ series resistors limit current during sub-V– excursions.
Internally compensated for stability with ≥200pF capacitive loads, it supports optional external compensation (0.22µF + 150Ω) to drive up to 1000pF. The amplifier maintains rail-to-rail swing (within 20mV of V+, 3mV of V– at no load) and high open-loop gain (1500V/mV min) across 3V, 5V, and ±15V supplies - optimized for single-supply sensor interfaces and precision current sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1.2MHz typical - enables stable unity-gain operation and supports closed-loop bandwidths up to ~1MHz in low-noise signal chains. |
| Slew Rate | 0.4V/µs typical - sufficient for 10kHz full-scale sine waves at 4Vpp without distortion in sensor front-ends. |
| Supply Current per Amplifier | 170µA max at TA = 25°C - allows four-channel operation on <1mA total, ideal for coin-cell or solar-powered systems. |
| Input Common-Mode Range | –0.4V to 44V (single supply); –15V to +29V (split supply) - supports direct sensing of high-side battery voltages or industrial 24V rails. |
| Output Drive Capability | ±25mA min - drives 2kΩ loads to rail while maintaining linearity, suitable for driving ADC reference buffers or LED bias circuits. |
| CMRR | 98dB typical - rejects power supply ripple and noise in precision instrumentation amplifiers and current shunt monitors. |
| Input Offset Voltage | 350µV max (–40°C to +85°C) - ensures ≤1.4mV error in 4mA–20mA loop transmitters using 250Ω sense resistors. |
Pinout & Package
LT1639IS#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 | Rail-to-rail sourcing/sinking node; capable of ±25mA drive into 2kΩ load without clipping. |
| 2 (–IN A) | Inverting input A | Differential input terminal with 44V common-mode tolerance; includes phase reversal protection. |
| 3 (+IN A) | Non-inverting input A | Same voltage range as –IN A; supports Over-The-Top operation up to 44V above V–. |
| 4 (V–) | Negative supply rail | Reference for all amplifiers; internally connected to exposed pad; reverse-battery protected to –18V. |
| 5 (+IN B) | Non-inverting input B | Independent channel input; identical specs to +IN A; no crosstalk with other channels. |
| 6 (–IN B) | Inverting input B | Matches –IN A performance; supports same high-voltage common-mode and Over-The-Top operation. |
| 7 (OUT B) | Amplifier B output | Electrically isolated output stage; shares V+ and V– rails but maintains >110dB channel separation at 1kHz. |
| 8 (V+) | Positive supply rail | Accepts 2.5V–44V total supply; bypassing with 0.1µF capacitor within 25mm is mandatory for stability. |
| 9 (OUT C) | Amplifier C output | Third independent output; rail-to-rail swing maintained under 10mA load at 5V supply. |
| 10 (–IN C) | Inverting input C | Full 44V differential and common-mode rating; internal 1kΩ series resistor limits fault current. |
| 11 (+IN C) | Non-inverting input C | Identical to +IN A/B; enables three-channel simultaneous high-side sensing in multi-sensor systems. |
| 12 (V–) | Shared negative rail | Common return for all four amplifiers; exposed pad internally tied to this pin for thermal conduction. |
| 13 (+IN D) | Non-inverting input D | Fourth channel input; supports same Over-The-Top operation and reverse-battery immunity as other inputs. |
| 14 (OUT D) | Amplifier D output | Final channel output; specified for 25mA drive and rail-to-rail swing across full temperature range. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Operation | Enables direct interface to signals up to 44V above V– or 0.3V above V+, eliminating level-shifting components in high-side current sensing. |
| Rail-to-Rail Input and Output | Supports full dynamic range utilization from V– to V+ on both inputs and outputs - critical for low-voltage (3V) battery-powered designs. |
| Reverse Battery Protection | Draws <1nA supply current during –18V reverse supply - prevents damage and system reset in automotive or portable equipment. |
| Low Power Consumption | 170µA per amplifier enables four-channel analog signal conditioning on <700µA total, extending battery life in IoT sensors. |
| Phase Reversal Protection | Prevents output inversion when inputs drop below V–, ensuring reliable behavior in fault conditions like sensor disconnection. |
| High Output Current | 25mA minimum sourcing/sinking capability drives heavy loads (e.g., 200Ω DAC buffers or LED drivers) without external boost stages. |
Applications
| Battery Monitoring System | 4–20mA Transmitter |
|---|---|
|
Use Scenario: Real-time monitoring of 12V–48V lead-acid or Li-ion battery packs in UPS or energy storage systems. IC Role / Device Role / Timing Role: Quad op amp configures as high-side current sense amplifier (Ch A), voltage divider buffer (Ch B), temperature compensation stage (Ch C), and reference buffer (Ch D). Use Value: Over-The-Top inputs measure cell voltage directly without isolation; rail-to-rail output drives ADC with full 0–5V range, improving resolution by 12 bits. |
Use Scenario: Industrial process control loop transmitting sensor data over 2-wire 4–20mA current loops. IC Role / Device Role / Timing Role: LT1639IS#TRPBF implements precision current-output stage with programmable gain and offset correction across all four channels. Use Value: 98dB CMRR rejects 50/60Hz noise from long cables; 170µA quiescent current minimizes loop power budget impact. |
| Portable Sensor Conditioning | Micropower Active Filter |
|
Use Scenario: Signal conditioning for MEMS accelerometers or gas sensors in handheld medical or environmental devices. IC Role / Device Role / Timing Role: One amplifier buffers sensor output, another provides gain, third handles offset nulling, fourth drives low-pass filter. Use Value: 1.2MHz GBW supports anti-aliasing filters up to 100kHz; 0.4V/µs slew rate avoids distortion in pulse-based sensor wake-up signals. |
Use Scenario: 2nd-order Sallen-Key low-pass filtering in battery-operated data loggers requiring <1µA standby current. IC Role / Device Role / Timing Role: Two amplifiers form active filter topology; remaining two provide reference buffering and supply monitoring. Use Value: Micropower operation (170µA/channel) keeps total filter circuit current under 1mA; rail-to-rail I/O preserves SNR across full filter passband. |
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 |
|---|---|---|---|
| AD8604ARUZ | Lower supply current (42µA/ch), lower GBW (8MHz), no Over-The-Top capability; max input voltage limited to V+ + 0.3V. | Not suitable for high-side sensing above V+; better for low-noise audio or precision DC-coupled buffers where voltage range is constrained. | Select AD8604ARUZ only when Over-The-Top functionality is unnecessary and ultra-low power (<200µA total) is prioritized over high-voltage tolerance. |
| TSV914IDT | Higher supply current (160µA/ch), lower CMRR (85dB), no reverse-battery protection; input common-mode range limited to V– to V+ – 1.2V. | Cannot replace LT1639IS#TRPBF in battery monitor or 4–20mA transmitter designs requiring >40V common-mode or reverse-polarity resilience. | Choose TSV914IDT for cost-sensitive consumer applications where supply voltage stays within 3.3V–5V and fault protection is handled externally. |
Compared with AD8604ARUZ and TSV914IDT, the LT1639IS#TRPBF uniquely combines 44V Over-The-Top input operation, reverse-battery immunity, and 170µA/ch consumption - making it irreplaceable in industrial sensor nodes where signal integrity must be preserved across wide voltage and fault conditions.
Availability
LT1639IS#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, 4–20mA transmitter design, and portable sensor conditioning applications requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +85°C operation.
Supply support for LT1639IS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1639 product line was designed specifically for micropower, high-voltage-tolerant signal conditioning in space-constrained and battery-dependent systems - emphasizing Over-The-Top operation, rail-to-rail I/O, and robust fault protection without sacrificing precision.
FAQ
What is the maximum input voltage the LT1639IS#TRPBF can tolerate relative to its supply rails?
The LT1639IS#TRPBF supports an absolute maximum input voltage of 44V differential and common-mode, independent of supply voltage. Its Over-The-Top® architecture allows either or both inputs to operate up to 44V above V– or up to 0.3V above V+, making it suitable for direct high-side sensing in 48V automotive or industrial systems without external level shifters.
Does the LT1639IS#TRPBF require external compensation for driving capacitive loads?
The LT1639IS#TRPBF is internally compensated for stable operation with ≥200pF capacitive loads. For loads exceeding 200pF - such as long PCB traces or ADC input capacitance - optional external compensation using a 0.22µF capacitor in series with a 150Ω resistor between output and ground is recommended to maintain phase margin and prevent peaking or oscillation.
Can the LT1639IS#TRPBF operate from a single 3V supply while maintaining rail-to-rail output swing?
Yes, the LT1639IS#TRPBF is fully specified for 3V single-supply operation. It delivers rail-to-rail output swing - within 20mV of V+ and 3mV of V– at no load - and maintains 25mA drive capability, 1.2MHz GBW, and 98dB CMRR across the full –40°C to +85°C temperature range on 3V.
How does the LT1639IS#TRPBF handle reverse battery connection?
The LT1639IS#TRPBF incorporates reverse battery protection rated to –18V. During reverse polarity, supply current drops below 1nA, preventing damage and preserving downstream circuitry. This feature eliminates the need for external blocking diodes or MOSFETs in automotive or portable equipment subject to accidental battery reversal.
What is the guaranteed input offset voltage specification for LT1639IS#TRPBF over temperature?
The LT1639IS#TRPBF guarantees a maximum input offset voltage of 1200µV over the full operating temperature range of –40°C to +85°C for the SO package (as specified in the LT1639I grade). At 25°C, typical VOS is 350µV, with drift of 2.5µV/°C - enabling accurate DC-coupled measurements in precision sensor interfaces.
LT1639IS#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
LT1639IS#TRPBF FAQ
1.How can I place an order for LT1639IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1639IS#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 LT1639IS#TRPBF reliable?
The price and inventory of LT1639IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1639IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1639IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1639IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1639IS#TRPBF?
LT1639IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1639IS#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 LT1639IS#TRPBF?
For technical support, including LT1639IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1639IS#TRPBF requirements.
6.How does Aetrix verify that LT1639IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1639IS#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 LT1639IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1639IS#TRPBF?
All LT1639IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1639IS#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 LT1639IS#TRPBF part is unused and in its original packaging.
Return procedure for LT1639IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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