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Analog Devices Inc. LT1639HS#PBF
- Part No.:
- LT1639HS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1639HS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:206
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Product details
Overview
LT1639HS#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. It draws only 170μA per amplifier at 2.5V–44V total supply, delivers ±13.4V output swing on ±15V supplies, and features 1.2MHz gain bandwidth and 0.4V/μs slew rate. It is used in battery monitoring and high-side current sensing where input voltages exceed V+.
For engineers reviewing the LT1639HS#PBF datasheet, LT1639HS#PBF pinout, LT1639HS#PBF application, or LT1639HS#PBF equivalent, key selection criteria include guaranteed operation from –40°C to 125°C, reverse-battery protection to 18V, rail-to-rail I/O, 44V common-mode input range, and compatibility with single-supply systems down to 2.7V.
Technical Context
The LT1639HS#PBF employs dual NPN/PNP input stages enabling Over-The-Top operation-inputs can exceed V+ by up to 0.3V while maintaining functionality and phase reversal protection. Its input stage includes internal 1kΩ series resistors and clamping diodes for robustness against overvoltage below V–.
Internally compensated for stability with ≥200pF capacitive loads, it supports optional RC compensation (0.22μF + 150Ω) for up to 1000pF. Output drives ±25mA minimum and maintains rail-to-rail swing under load, with CMRR of 72dB over 0.3V–44V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 44V total; enables direct interface with 24V industrial rails and 44V battery stacks without level shifting. |
| Quiescent Current | 170μA per amplifier max; allows continuous operation in micropower systems like solar-powered sensors. |
| Gain Bandwidth Product | 1.2MHz typical; supports closed-loop gains up to 12 at 100kHz with stable phase margin. |
| Slew Rate | 0.4V/μs typical; sufficient for 10kHz full-scale sine waves at 4Vpp without distortion. |
| Input Common-Mode Range | 0.3V to 44V relative to V–; permits high-side sensing in 48V automotive or telecom power systems. |
| Output Swing (±15V) | ±13.4V at ±10mA load; delivers >90% rail utilization for precision analog signal conditioning. |
| CMRR | 72dB over full input range; rejects noise in noisy supply environments such as motor drive feedback paths. |
Pinout & Package
LT1639HS#PBF is housed in a 14-lead plastic SO package (S package), with exposed pad internally connected to V– for thermal and electrical performance. Pin 1 is marked with a dot or notch; device orientation follows JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Capable of sourcing/sinking ±25mA; rail-to-rail swing supports direct DAC buffering. |
| 2 (–IN A) | Inverting input A | Protected by 1kΩ series resistor; handles –0.3V to 44V common-mode with phase reversal immunity. |
| 3 (+IN A) | Non-inverting input A | Same Over-The-Top capability as –IN; enables high-side voltage monitor configurations. |
| 4 (V–) | Negative supply | Internally connected to exposed pad; must be low-impedance ground or negative rail for thermal management. |
| 5 (+IN B) | Non-inverting input B | Independent channel; identical specs to A channel for multi-sensor signal conditioning. |
| 6 (–IN B) | Inverting input B | Reverse-battery protected; draws <1nA during –18V reverse supply condition. |
| 7 (OUT B) | Amplifier B output | Unity-gain stable; drives 1000pF with optional compensation for sensor cable capacitance. |
| 8 (V+) | Positive supply | Bypass with 0.1μF ceramic near pin; additional 4.7μF electrolytic required for >20mA load transients. |
| 9 (OUT C) | Amplifier C output | Same rail-to-rail output drive; supports 4–20mA transmitter loop compliance up to 36V. |
| 10 (–IN C) | Inverting input C | Operates in PNP/NPN dual-input mode; CMRR degrades only when crossing V+–0.8V transition zone. |
| 11 (+IN C) | Non-inverting input C | Enables differential sensing across wide common-mode ranges, e.g., shunt-based battery cell monitoring. |
| 12 (V–) | Negative supply (redundant) | Second V– connection improves PSRR and reduces ground bounce in high-speed switching environments. |
| 13 (+IN D) | Non-inverting input D | Supports independent biasing; used in active filter topologies requiring matched DC offsets. |
| 14 (OUT D) | Amplifier D output | Final channel for multi-stage signal chain; specified for THD+N <0.01% at 1kHz with 20kΩ load. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Operation | Inputs functional up to 44V above V– regardless of V+, enabling direct high-side sensing in 48V systems without external level shifters. |
| Rail-to-Rail Input and Output | Full dynamic range utilization from V– to V+ on both inputs and outputs, maximizing ADC resolution in low-voltage microcontroller interfaces. |
| Reverse Battery Protection | Draws <1nA supply current during –18V reverse supply, eliminating need for external blocking diodes in automotive battery monitoring. |
| No Supply Sequencing Requirement | V+ and V– may be powered in any order; prevents latch-up or damage during hot-plug events in modular power systems. |
| Phase Reversal Immunity | Internal circuitry prevents output inversion when inputs fall below V–, critical for safety-critical overvoltage detection circuits. |
Applications
| Battery Monitoring System | High-Side Current Sensing |
|---|---|
Use Scenario: Monitoring individual cell voltages in 12S Li-ion battery packs with stacked 44V total bus voltage. IC Role / Device Role / Timing Role: Quad op amp configures four independent high-impedance voltage followers, each measuring one cell's voltage referenced to pack ground. Use Value: Over-The-Top input allows direct connection to cells floating up to 44V above ground, eliminating isolation components and reducing BOM cost by 30%. | Use Scenario: Measuring motor phase current in industrial inverters using 0.2Ω shunt resistors on high-side switches. IC Role / Device Role / Timing Role: Configured as difference amplifier with matched external resistors to reject common-mode noise from PWM switching. Use Value: 72dB CMRR and 44V input range enable accurate current measurement despite 400VDC bus noise, improving torque control accuracy by ±0.5%. |
| 4–20mA Transmitter | Micropower Active Filter |
Use Scenario: Converting temperature sensor output to industry-standard 4–20mA loop signal for PLC interfacing. IC Role / Device Role / Timing Role: One amplifier conditions sensor signal; another serves as precision current source controlling loop transistor base. Use Value: 170μA quiescent current per amplifier enables full 4–20mA loop operation from 3.3V microcontroller supply, extending field device battery life to >5 years. | Use Scenario: Anti-aliasing filtering for 12-bit SAR ADC sampling at 100ksps in portable gas analyzers. IC Role / Device Role / Timing Role: Quad configuration implements 4-pole Sallen-Key topology with unity-gain buffers isolating filter sections. Use Value: 1.2MHz GBW ensures <0.1dB passband ripple to 10kHz; rail-to-rail I/O preserves full ADC input range without external biasing. |
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 range (2.7V–6V), no Over-The-Top capability, 6.4MHz GBW, 1.6V/μs slew rate. | Not suitable for >6V single-supply or high-side sensing; limited to low-voltage portable instrumentation. | Select TLV2464IDR only when operating strictly below 6V and high common-mode range is unnecessary. |
| AD8604ARUZ | Wider supply (2.7V–6.0V), no Over-The-Top, 8MHz GBW, 5V/μs slew rate, lower offset (65μV typ). | Optimized for precision low-noise signal chains, not high-voltage industrial sensing. | Choose AD8604ARUZ for sub-100μV offset requirements in medical sensor front-ends, not for 44V input applications. |
Compared with TLV2464IDR and AD8604ARUZ, the LT1639HS#PBF uniquely supports 44V common-mode input and reverse-battery protection-critical for automotive and industrial power systems where other alternatives require external protection circuitry and level-shifting, increasing design complexity and failure points.
Availability
LT1639HS#PBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, and 4–20mA transmitter designs requiring stable component supply across extended temperature ranges.
Supply support for LT1639HS#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1639HS#PBF belongs to ADI's legacy Linear Technology precision op amp portfolio, engineered specifically for rugged industrial and automotive applications demanding wide supply range, Over-The-Top input operation, and guaranteed –40°C to 125°C performance.
FAQ
What is the maximum common-mode input voltage for LT1639HS#PBF?
The LT1639HS#PBF supports a common-mode input voltage range from 0.3V to 44V relative to V–, independent of V+. This Over-The-Top® capability allows direct connection to signals exceeding V+, making it ideal for high-side sensing in 48V battery systems. The specification is guaranteed over the full –40°C to 125°C operating temperature range for the LT1639HS#PBF.
Does LT1639HS#PBF require external compensation for driving capacitive loads?
The LT1639HS#PBF is internally compensated for stable operation with up to 200pF capacitive load. For loads exceeding 200pF-such as long PCB traces or sensor cables-optional external compensation using a 0.22μF capacitor in series with a 150Ω resistor between output and ground is recommended to maintain stability up to 1000pF. This configuration is validated in the LT1639HS#PBF datasheet Figure 12.
Can LT1639HS#PBF operate with a single 3.3V supply?
Yes, the LT1639HS#PBF operates from a minimum total supply voltage of 2.7V, making it fully compatible with 3.3V single-supply systems. At 3.3V, it delivers rail-to-rail input and output swing, 1.2MHz gain bandwidth, and 170μA quiescent current per amplifier-enabling precision signal conditioning in space-constrained IoT edge nodes without sacrificing performance.
What is the reverse battery protection rating for LT1639HS#PBF?
The LT1639HS#PBF provides reverse battery protection up to –18V on either supply pin, drawing less than 1nA supply current during fault conditions. This eliminates the need for external series diodes in automotive battery monitoring applications, preserving voltage headroom and reducing thermal dissipation. The protection is fully specified and tested for the LT1639HS#PBF across its –40°C to 125°C temperature range.
How does the Over-The-Top® architecture of LT1639HS#PBF prevent phase reversal?
The LT1639HS#PBF incorporates dedicated phase reversal protection circuitry that actively disables the input stage when inputs fall below V–, preventing false output transitions. Unlike conventional op amps that invert output when inputs go negative, the LT1639HS#PBF maintains correct polarity and predictable behavior-critical for overvoltage detection circuits where output polarity directly triggers safety shutdowns.
LT1639HS#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:
- 0.38V/µs
- Gain Bandwidth Product:
- 1.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 250 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1639HS#PBF FAQ
1.How can I place an order for LT1639HS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1639HS#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 LT1639HS#PBF reliable?
The price and inventory of LT1639HS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1639HS#PBF is usually 5 days.
3.What payment methods are accepted for LT1639HS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1639HS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1639HS#PBF?
LT1639HS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1639HS#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 LT1639HS#PBF?
For technical support, including LT1639HS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1639HS#PBF requirements.
6.How does Aetrix verify that LT1639HS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1639HS#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 LT1639HS#PBF meets industry standards.
7.What is the process for return or replacement of LT1639HS#PBF?
All LT1639HS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1639HS#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 LT1639HS#PBF part is unused and in its original packaging.
Return procedure for LT1639HS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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