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Analog Devices Inc. LT1639IS#PBF
- Part No.:
- LT1639IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1639IS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:976
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Product details
Overview
LT1639IS#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 V– or above V+. It delivers 1.2MHz gain bandwidth, 0.4V/µs slew rate, and 25mA output drive per channel while consuming only 170µA per amplifier at 2.5V–44V supply range. It is used in battery monitoring, sensor conditioning, and 4mA–20mA transmitter circuits requiring wide common-mode voltage tolerance.
For engineers reviewing the LT1639IS#PBF datasheet, LT1639IS#PBF pinout, LT1639IS#PBF application, or LT1639IS#PBF equivalent, key selection criteria include its reverse-battery protection to 18V, rail-to-rail I/O swing, ±15V or single-supply operation down to 2.7V, and guaranteed performance over –40°C to +85°C in the 14-lead SO package.
Technical Context
The LT1639IS#PBF integrates dual-input-stage architecture (NPN and PNP) to enable Over-The-Top operation: inputs remain functional even when biased above V+, with internal Schottky clamping limiting input bias current to ~8µA at 0.3V above V+. Its phase reversal protection prevents false outputs during negative overvoltage transients.
It features unity-gain stability and optional compensation for capacitive loads up to 1000pF using a 0.22µF capacitor in series with a 150Ω resistor. Input common-mode range spans –0.4V to 44V on single supply, and differential input voltage withstands ±44V independent of supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1.2MHz - supports stable closed-loop operation up to ~100kHz at gain ≥12 with adequate phase margin. |
| Slew Rate | 0.4V/µs - enables clean 10kHz full-scale output swing into 10kΩ load without distortion. |
| Supply Current per Amp | 170µA - allows continuous operation in micropower systems with multi-year battery life. |
| Input Voltage Range | –0.4V to 44V - permits direct sensing of high-side currents or battery voltages exceeding V+. |
| Output Drive | ±25mA - drives 200Ω loads to rail with <10mV error, suitable for active filter and transmitter output stages. |
| CMRR | 98dB - rejects common-mode noise in precision sensor front-ends operating near supply rails. |
| Reverse Battery Protection | 18V - draws <1nA supply current under reverse polarity, eliminating need for external diode protection. |
Pinout & Package
LT1639IS#PBF is housed in a 14-lead plastic SO (Small Outline) package with exposed pad not internally connected. Pin 1 is marked by a beveled corner or dot; the device is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Rail-to-rail sourcing/sinking node capable of ±25mA; requires no external compensation for ≤200pF loads. |
| 2 (–IN A) | Inverting input A | Differential input terminal with 1kΩ series protection resistor; handles –0.4V to 44V common-mode range. |
| 3 (+IN A) | Non-inverting input A | Differential input terminal with identical protection and voltage range as Pin 2. |
| 4 (V–) | Negative supply rail | Reference for all amplifiers; internally tied to exposed pad in SO package; reverse-battery protected. |
| 5 (+IN C) | Non-inverting input C | Third amplifier's positive input; electrically isolated but shares same process and specs as Pins 2–3. |
| 6 (–IN C) | Inverting input C | Third amplifier's negative input; matches Pin 2 in ESD robustness and CM range. |
| 7 (OUT C) | Amplifier C output | Identical output drive and rail-swing capability as Pin 1. |
| 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 | Fourth output; fully independent; supports same load and compensation rules as other outputs. |
| 10 (–IN D) | Inverting input D | Fourth amplifier's negative input; matches Pin 2 in electrical behavior and protection. |
| 11 (+IN D) | Non-inverting input D | Fourth amplifier's positive input; identical to Pin 3 in specification and layout sensitivity. |
| 12 (V–) | Shared negative rail | Common return for all four amplifiers; must be low-impedance to minimize crosstalk and ground bounce. |
| 13 (+IN B) | Non-inverting input B | Second amplifier's positive input; functionally identical to Pin 3. |
| 14 (–IN B) | Inverting input B | Second amplifier's negative input; matches Pin 2 in bias current, noise, and voltage range. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Operation | Enables direct high-side sensing (e.g., battery voltage monitoring) without level-shifting circuitry when inputs exceed V+. |
| Rail-to-Rail Input and Output | Supports full dynamic range utilization in 3V and 5V systems-output swings within 20mV of V+ and 3mV of V– at no load. |
| Reverse Battery Protection | Withstands –18V supply without damage or excessive current draw (<1nA), eliminating external protection diodes in automotive applications. |
| Phase Reversal Protection | Prevents output inversion when inputs fall below V–, critical for fault-tolerant sensor interfaces and supply-current monitors. |
| Unity-Gain Stable with Optional Compensation | Drives up to 1000pF capacitive loads using external RC network (0.22µF + 150Ω), enabling direct connection to ADC inputs or long cables. |
Applications
| Battery Monitoring | Sensor Conditioning |
|---|---|
Use Scenario: Monitoring 12V–48V lead-acid or Li-ion battery packs in portable medical devices or UPS systems. IC Role / Device Role / Timing Role: Amplifier A configured as high-side current sense amplifier; inputs referenced to battery positive terminal. Use Value: Enables accurate current measurement without shunt resistor on ground path, preserving system ground integrity and simplifying isolation. | Use Scenario: Amplifying low-level signals from bridge-based pressure or temperature sensors in industrial IoT nodes. IC Role / Device Role / Timing Role: Amplifier B/C used in instrumentation amplifier front-end with rail-to-rail output driving SAR ADC reference buffer. Use Value: Full 0–5V output swing maximizes ADC utilization; 98dB CMRR rejects power supply ripple and EMI coupling on sensor lines. |
| 4mA–20mA Transmitter | Supply Current Sensing |
Use Scenario: Generating loop-powered analog output for PLC analog input modules in factory automation. IC Role / Device Role / Timing Role: Amplifier D functions as voltage-to-current converter with external MOSFET; operates from loop supply (12–40V). Use Value: Over-The-Top input allows direct sensing of loop voltage; 25mA output drive sustains 20mA load plus internal circuitry across full temperature range. | Use Scenario: Measuring real-time current consumption of microcontroller subsystems in energy-harvesting wireless sensors. IC Role / Device Role / Timing Role: Amplifier A/B configured as bidirectional current monitor across 0.1Ω shunt on VCC rail. Use Value: Input range extends to –0.4V enables accurate zero-crossing detection; 170µA quiescent current minimizes measurement error in ultra-low-power modes. |
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 |
|---|---|---|---|
| TLV2474IDR | Lower GBW (2.8MHz) and higher supply current (600µA/amp); no Over-The-Top capability; max supply 6V. | Not suitable for >6V supplies or high-side sensing; limited to low-voltage portable electronics. | Select TLV2474IDR only for cost-sensitive, low-voltage (<5.5V), non-high-side applications where micropower is secondary. |
| AD8604ARUZ | Higher precision (VOS = 600µV max), lower noise (12nV/√Hz), but no reverse-battery protection and 6V max supply. | Cannot replace LT1639IS#PBF in automotive or industrial battery-monitoring roles due to voltage and protection limitations. | Choose AD8604ARUZ for precision signal conditioning in 3.3V/5V systems where input overvoltage and reverse polarity are not concerns. |
Compared with TLV2474IDR and AD8604ARUZ, the LT1639IS#PBF uniquely combines 44V input tolerance, reverse-battery immunity, and micropower operation-making it irreplaceable in high-voltage, battery-backed, or harsh-environment analog signal chains where reliability and voltage range are primary constraints.
Availability
LT1639IS#PBF is available at Aetrix Electronics and suitable for battery monitoring, sensor conditioning, 4mA–20mA transmitter design, and supply current sensing applications requiring stable component supply across industrial temperature ranges.
Supply support for LT1639IS#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 LT1639IS#PBF belongs to the Over-The-Top® precision op amp product line, engineered specifically for high-voltage, micropower, rail-to-rail signal conditioning in battery-powered and industrial monitoring systems.
FAQ
What is the maximum input voltage the LT1639IS#PBF can tolerate relative to V–?
The LT1639IS#PBF guarantees operation with inputs up to 44V above V–, independent of V+ supply voltage. This is validated across –40°C to +85°C and enables direct high-side sensing in battery and power rail monitoring applications without external level-shifting components. The LT1639IS#PBF maintains specified offset, CMRR, and gain accuracy under this condition.
Does the LT1639IS#PBF require external compensation for driving a 500pF capacitive load?
Yes-the LT1639IS#PBF is internally compensated for ≤200pF. For 500pF loads, the recommended optional compensation network is a 0.22µF capacitor in series with a 150Ω resistor connected between output and ground. This configuration stabilizes the LT1639IS#PBF across all output currents and prevents peaking or oscillation. Without it, the LT1639IS#PBF may exhibit overshoot or ringing.
Can the LT1639IS#PBF operate from a single 3.3V supply?
Yes-the LT1639IS#PBF is fully specified for single-supply operation from 2.7V to 44V. At 3.3V, it delivers rail-to-rail input range (–0.4V to 44V) and output swing within 20mV of V+ and 3mV of V– at no load. Its 170µA per amplifier quiescent current ensures minimal impact on battery life in portable 3.3V systems using the LT1639IS#PBF.
What is the reverse battery protection rating of the LT1639IS#PBF?
The LT1639IS#PBF provides reverse battery protection up to –18V on the V+ pin while drawing less than 1nA supply current. This feature eliminates the need for external series diodes in automotive and portable equipment designs. The protection is active across the full –40°C to +85°C operating range and applies regardless of whether V– is grounded or floating. The LT1639IS#PBF remains undamaged and retains full functionality after removal of the reverse condition.
Is the LT1639IS#PBF pin-compatible with other quad op amps in SO-14 packages?
No-the LT1639IS#PBF uses a proprietary pinout optimized for low crosstalk and thermal symmetry in quad configurations; it is not pin-compatible with industry-standard SO-14 quad op amps like the LM324 or TL074. Layout reuse requires verification against the official LT1639IS#PBF pin diagram. Signal routing, decoupling placement, and grounding must follow Linear Technology's recommended layout guidelines to maintain specified PSRR and CMRR performance.
LT1639IS#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
LT1639IS#PBF FAQ
1.How can I place an order for LT1639IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1639IS#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 LT1639IS#PBF reliable?
The price and inventory of LT1639IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1639IS#PBF is usually 5 days.
3.What payment methods are accepted for LT1639IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1639IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1639IS#PBF?
LT1639IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1639IS#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 LT1639IS#PBF?
For technical support, including LT1639IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1639IS#PBF requirements.
6.How does Aetrix verify that LT1639IS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1639IS#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 LT1639IS#PBF meets industry standards.
7.What is the process for return or replacement of LT1639IS#PBF?
All LT1639IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1639IS#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 LT1639IS#PBF part is unused and in its original packaging.
Return procedure for LT1639IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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