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Analog Devices Inc. LT1631CS#PBF
- Part No.:
- LT1631CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1631CS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,977
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Product details
Overview
LT1631CS#PBF from Analog Devices (formerly Linear Technology) is a quad rail-to-rail input and output precision operational amplifier with 30MHz gain-bandwidth product, 10V/µs slew rate, and ±15V or 2.7V–36V dual/single-supply operation. It delivers 35mA output drive, <525µV max input offset voltage, and 106dB CMRR over full input range - used in high-fidelity active filters, A/D driver stages, and low-voltage signal conditioning.
For engineers reviewing the LT1631CS#PBF datasheet, LT1631CS#PBF pinout, LT1631CS#PBF application, or LT1631CS#PBF equivalent, key selection criteria include guaranteed rail-to-rail I/O swing at 3V supply, channel-to-channel matching for multi-amplifier topologies, thermal stability across –40°C to 85°C, and SO-14 package compatibility with standard quad op amp layouts.
Technical Context
The LT1631CS#PBF employs a patented dual-input-stage architecture: a PNP pair active from V– to ~1.4V below V+, and an NPN pair active near V+, enabling true rail-to-rail common-mode input range without phase reversal. Its output stage uses complementary emitter-follower topology to achieve rail-to-rail swing with >35mA sink/source capability.
DC precision is maintained via on-chip trimming of both input stages - one referenced to V– and one to V+ - yielding typical CMRR of 106dB and open-loop gain ≥1,000 V/mV into 10kΩ. Performance is specified across 3V, 5V, and ±15V supplies, with supply current per amplifier at 4.1mA (typ) over –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 30MHz - supports stable unity-gain buffer or 2nd-order filter design up to ~10MHz with adequate phase margin. |
| Slew Rate | 10V/µs - enables clean 1Vpp 1MHz square wave reproduction without slewing distortion. |
| Input Offset Voltage | ≤525µV max - ensures ≤0.05% gain error in 10V full-scale instrumentation amplifiers. |
| Output Drive Current | ≥35mA - directly drives 100Ω loads or 1000pF capacitive loads without external buffering. |
| Common-Mode Rejection | 106dB typical - rejects >99.999% of supply noise when used in single-supply sensor front-ends. |
| Supply Range | 2.7V to ±15V - operates from Li-ion battery (3.3V) to industrial ±12V rails without redesign. |
| Input Noise Density | 6nV/√Hz @ 1kHz - contributes <1.2µV RMS noise in 10kHz bandwidth, suitable for µV-level sensor signals. |
Pinout & Package
LT1631CS#PBF is housed in a 14-lead plastic SO (SO-14) package with standard quad op amp pinout and JEDEC MS-012AC footprint. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - rail-to-rail swing capable of sourcing/sinking ≥35mA. |
| 2 | –IN A | Inverting input of Amp A - matched bias current (≤1000nA) minimizes offset in high-Z networks. |
| 3 | +IN A | Non-inverting input of Amp A - supports common-mode voltages from V– to V+. |
| 4 | V+ | Positive supply rail - accepts 2.7V to 18V (single) or +18V (dual). |
| 5 | +IN B | Non-inverting input of Amp B - identical electrical specs to Pin 3; channel matching ≤950µV VOS diff. |
| 6 | –IN B | Inverting input of Amp B - symmetrical layout with Pin 2 for PCB routing consistency. |
| 7 | OUT B | Amplifier B output - electrically isolated from OUT A; no crosstalk >112dB @ 1kHz. |
| 8 | OUT D | Amplifier D output - Pin 8 is bottom-right corner in SO-14 top view; matches Pin 1 performance. |
| 9 | –IN D | Inverting input of Amp D - shares same input stage architecture as Pins 2 and 6. |
| 10 | +IN D | Non-inverting input of Amp D - full rail-to-rail common-mode range, same as Pin 3. |
| 11 | V– | Negative supply rail - accepts 0V (single-supply) or –18V (dual); supports input down to V–. |
| 12 | +IN C | Non-inverting input of Amp C - Pin 12 is adjacent to V– for minimized ground bounce coupling. |
| 13 | –IN C | Inverting input of Amp C - matched to other channels; bias current shift ≤2600nA over full VCM. |
| 14 | OUT C | Amplifier C output - fully characterized for settling time (520ns to 0.01%) at 5V supply. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interfacing with 3.3V ADCs and DACs without level-shifting circuitry. |
| Dual-input-stage architecture | Eliminates input crossover distortion and phase reversal when VCM crosses mid-supply. |
| Patented V–- and V+-referenced trimming | Delivers 106dB CMRR and <525µV VOS without external calibration. |
| 35mA output drive per amplifier | Drives 10-bit SAR ADC reference inputs or 50Ω transmission lines without external buffers. |
| Specified from –40°C to 85°C | Guarantees 30MHz GBW and 10V/µs slew rate across industrial temperature range. |
Applications
| Active Filters | A/D Converter Drivers |
|---|---|
Use Scenario: 4th-order Butterworth low-pass filter at 400kHz in data acquisition front-end. IC Role / Device Role / Timing Role: Quad amplifier configured as two 2-pole Sallen-Key stages; one LT1631CS#PBF implements entire filter. Use Value: 30MHz GBW ensures <0.1dB passband flatness and –3dB point accuracy within 0.5% of target frequency. | Use Scenario: Driving 12-bit successive-approximation ADC input with 10V full-scale range. IC Role / Device Role / Timing Role: Unity-gain buffer isolating sensor signal path from ADC sampling kickback. Use Value: Rail-to-rail output swing guarantees 0–10V compliance; 520ns settling to 0.01% prevents conversion errors. |
| Rail-to-Rail Buffer Amplifiers | Battery-Powered Systems |
Use Scenario: Single-supply pH sensor interface requiring 0–4V output swing from 3.3V rail. IC Role / Device Role / Timing Role: Non-inverting amplifier with gain = 1, powered from Li-ion cell (3.0–4.2V). Use Value: Input common-mode range includes 0V and 3.3V; output swings to within 15mV of rails at 20mA load. | Use Scenario: Portable medical device with 3.3V microcontroller and analog front-end. IC Role / Device Role / Timing Role: Signal conditioning for ECG electrode amplification and filtering. Use Value: 3.5mA supply current per amplifier extends battery life; 6nV/√Hz noise preserves µV-level biopotential fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP4177ARZ | Lower noise (3.5nV/√Hz), lower GBW (1.3MHz), higher VOS (60µV typ), SO-14 package. | Better for DC-critical instrumentation; unsuitable for >100kHz active filters due to limited bandwidth. | Select OP4177ARZ when ultra-low noise and offset dominate over speed and rail-to-rail I/O. |
| TLV2464IDR | Lower supply current (550µA/amplifier), lower GBW (6.4MHz), VOS = 1.6mV max, SO-14 package. | Optimized for ultra-low-power battery systems; insufficient slew rate for fast-settling ADC drivers. | Select TLV2464IDr when sub-mA quiescent current is mandatory and bandwidth <1MHz suffices. |
Compared with OP4177ARZ and TLV2464IDR, LT1631CS#PBF uniquely balances 30MHz bandwidth, rail-to-rail I/O, and <525µV offset in a single SO-14 quad op amp - making it optimal for mixed-signal systems requiring both precision and speed without supply voltage compromise.
Availability
LT1631CS#PBF is available at Aetrix Electronics and suitable for active filter design, A/D converter driving, rail-to-rail buffering, and battery-powered signal conditioning requiring stable component supply across industrial temperature ranges.
Supply support for LT1631CS#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, formed through the acquisition of Linear Technology in 2017.
The LT1631CS#PBF belongs to ADI's legacy Linear Technology precision op amp family, engineered for applications demanding rail-to-rail operation, wide supply range, and robust DC accuracy in space-constrained industrial and portable systems.
FAQ
What is the maximum operating temperature range for the LT1631CS#PBF?
The LT1631CS#PBF is rated for operation from –40°C to +85°C (I-grade). This range is fully tested and guaranteed per datasheet specifications including gain-bandwidth, slew rate, and input offset voltage. The 'C' suffix in the part number denotes commercial-grade qualification, but the 'S' package and #PBF marking confirm the industrial temperature grade is shipped and warranted.
Does the LT1631CS#PBF support true rail-to-rail input common-mode voltage?
Yes, the LT1631CS#PBF supports input common-mode voltage from V– to V+, verified across all supply conditions (3V, 5V, ±15V). Its dual-input-stage architecture - combining PNP and NPN differential pairs - eliminates dead zones and phase reversal. At 5V supply, input operation is confirmed from 0V to 5V with <525µV offset shift, as documented in the Electrical Characteristics table under ∆VOS.
Can the LT1631CS#PBF drive a 1000pF capacitive load without instability?
Yes, the LT1631CS#PBF is characterized for capacitive load handling up to 1000pF with <10% overshoot at unity gain (Figure G16). Its internal compensation maintains phase margin >40° even with 1000pF load and 1kΩ series resistor. For direct connection to ADC input capacitors or long traces, adding a 10Ω–50Ω isolation resistor is recommended to ensure monotonic settling.
What is the typical supply current per amplifier for LT1631CS#PBF at 5V supply and 25°C?
The typical supply current per amplifier for LT1631CS#PBF is 3.5mA at 5V supply and 25°C, as specified in the Features list and confirmed in the Electrical Characteristics table (IS = 3.5mA typ, 4.4mA max). Over the full –40°C to 85°C range, typical current rises to 4.1mA, with a maximum of 5.2mA - critical for battery-life estimation in portable designs using LT1631CS#PBF.
Is the LT1631CS#PBF pin-compatible with other quad op amps in SO-14 packages?
Yes, the LT1631CS#PBF uses the industry-standard quad op amp pinout defined in JEDEC MS-012AC: Pins 1/7/8/14 are outputs, Pins 2/3/5/6/9/10/12/13 are inputs, and Pins 4/V+ and 11/V– are power rails. This matches LM324, TL074, and OP4177 pinouts, enabling drop-in replacement where bandwidth, rail-to-rail I/O, and precision requirements align - though layout review for thermal and decoupling is advised.
LT1631CS#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:
- 10V/µs
- Gain Bandwidth Product:
- 30 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 550 nA
- Voltage - Input Offset:
- 220 µV
- Current - Supply:
- 4.1mA (x4 Channels)
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1631CS#PBF FAQ
1.How can I place an order for LT1631CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1631CS#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 LT1631CS#PBF reliable?
The price and inventory of LT1631CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1631CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1631CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1631CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1631CS#PBF?
LT1631CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1631CS#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 LT1631CS#PBF?
For technical support, including LT1631CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1631CS#PBF requirements.
6.How does Aetrix verify that LT1631CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1631CS#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 LT1631CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1631CS#PBF?
All LT1631CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1631CS#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 LT1631CS#PBF part is unused and in its original packaging.
Return procedure for LT1631CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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