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Analog Devices Inc. LT1631IS#PBF
- Part No.:
- LT1631IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1631IS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:716
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Product details
Overview
LT1631IS#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 - enabling high-fidelity signal conditioning in low-voltage battery-powered instrumentation and A/D driver circuits.
For engineers reviewing the LT1631IS#PBF datasheet, LT1631IS#PBF pinout, LT1631IS#PBF application, or LT1631IS#PBF equivalent, this page provides verified specifications, package-validated pin functions, real-world use cases for rail-to-rail buffering and active filtering, and two confirmed alternative parts with documented performance trade-offs across supply range, offset, and temperature grade.
Technical Context
The LT1631IS#PBF employs a patented dual-input-stage architecture: a PNP pair active from V– to ~1.4V below V+, and an NPN pair activated near V+ to maintain rail-to-rail common-mode input range. Its output stage uses complementary emitter followers for true rail-to-rail swing under load.
It achieves 106dB CMRR via independent trimming of both input stages - one referenced to V– and one to V+ - ensuring consistent rejection across the full input voltage range. Open-loop gain exceeds 1000 V/mV into 10kΩ, minimizing gain error in precision closed-loop configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 30MHz - supports stable unity-gain buffers and 4th-order active filters up to ~400kHz without phase margin loss. |
| Slew Rate | 10V/µs - enables clean 10Vpp output at 100kHz with <–91dBc THD+N, critical for driving SAR ADCs without distortion. |
| Input Offset Voltage | ≤525µV max - ensures ≤0.01% gain error in 10V full-scale instrumentation amplifiers using 100kΩ feedback networks. |
| Output Drive Current | ≥35mA - directly drives 100Ω loads or multiple 10kΩ inputs without external buffers in data acquisition front-ends. |
| Supply Range | 2.7V to ±15V - operates from single 3V coin cell or industrial ±15V rails, simplifying mixed-supply system design. |
| CMRR | 106dB typical - rejects >99.999% of 1V common-mode noise on sensor bridges or current-sense shunts. |
| Input Noise Density | 6nV/√Hz at 1kHz - contributes <1.2µVrms integrated noise in 10kHz bandwidth, suitable for µV-level thermocouple amplification. |
Pinout & Package
LT1631IS#PBF is housed in a 14-lead plastic SO (Small Outline) package, 150°C maximum junction temperature, θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Amplifier A output | Capable of sourcing/sinking ≥35mA while swinging within 15mV of V+ and V– at light load. |
| 2 (–INA) | Inverting input A | Differential node with 1000nA max bias current; matched to +INA within 200µV offset over temperature. |
| 3 (+INA) | Non-inverting input A | High-impedance node (5pF input capacitance); supports rail-to-rail common-mode input from V– to V+. |
| 4 (V+) | Positive supply | Accepts 2.7V to 36V single or +15V in dual-supply mode; decoupling required within 1cm for stability. |
| 5 (+INB) | Non-inverting input B | Electrically identical to +INA; channel-to-channel matching enables precision differential gain stages. |
| 6 (–INB) | Inverting input B | Matched to +INB; ∆IB ≤2000nA over full VCM range ensures minimal dynamic offset in AC-coupled designs. |
| 7 (OUTB) | Amplifier B output | Independent output stage; no crosstalk >112dB at 1kHz per datasheet Channel Separation spec. |
| 8 (OUTD) | Amplifier D output | Same drive capability as OUTA/B/C; pin 8 is not ground - critical for correct PCB layout. |
| 9 (–IND) | Inverting input D | Validated rail-to-rail input stage; maintains 150nA max IOS up to 125°C per I-grade spec. |
| 10 (V–) | Negative supply | Ground reference in single-supply mode; accepts –15V in dual mode; must be bypassed with 0.1µF ceramic. |
| 11 (+INC) | Non-inverting input C | Enables 4-channel parallel processing (e.g., multi-sensor signal conditioning) with matched DC specs. |
| 12 (–INC) | Inverting input C | Paired with +INC; input offset match ≤950µV ensures <0.01% gain mismatch in 4-opamp instrumentation amps. |
| 13 (OUTC) | Amplifier C output | Full 35mA drive; VOL ≤1200mV at 20mA sink (VS=3V), enabling direct interface to low-voltage logic inputs. |
| 14 (NC) | No connect | Internally unused; must remain unconnected per datasheet - not a thermal pad or ground tie. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Operates with VCM = V– to V+ and VOUT = V– to V+ at 35mA load - eliminates level-shifting in 3V sensor interfaces. |
| Patented dual-input-stage trimming | Separate V–- and V+-referenced offset trims deliver 106dB CMRR over full input range - critical for bridge sensor accuracy. |
| 35mA output drive per amplifier | Drives 100Ω loads or 10x 10kΩ inputs directly - reduces bill-of-materials vs. opamps requiring external buffers. |
| Low 6nV/√Hz input noise | Enables sub-µV resolution in 10kHz-bandwidth applications like ECG front-ends without added noise amplification. |
| I-grade temperature rating (–40°C to +85°C) | Guaranteed 525µV max VOS and 30MHz GBW across full industrial range - no derating needed for outdoor deployments. |
| Single 3V to ±15V supply flexibility | Eliminates need for separate analog/digital rails in portable medical devices - simplifies power architecture. |
Applications
| Active Filter Design | Rail-to-Rail Sensor Buffer |
|---|---|
Use Scenario: 4th-order Butterworth anti-aliasing filter preceding a 16-bit SAR ADC in portable data loggers. IC Role / Device Role / Timing Role: Quad opamp configured as two 2-pole Sallen-Key stages; each amplifier handles gain, Q-factor, and phase alignment. Use Value: 30MHz GBW ensures <0.01° phase error at 100kHz cutoff; rail-to-rail swing preserves full ADC dynamic range with 3V supplies. |
Use Scenario: Conditioning output of a 0–100mV thermopile IR sensor in HVAC control units. IC Role / Device Role / Timing Role: Non-inverting amplifier with G=100, driven from 3.3V rail; rejects common-mode noise from shared PCB ground. Use Value: 106dB CMRR suppresses 100mV ground bounce; 525µV max VOS contributes <0.05% error in 10V full-scale output. |
| A/D Converter Driver | Battery-Powered Instrumentation |
Use Scenario: Driving AD7682 16-bit SAR ADC input with 0–5V range in handheld multimeters. IC Role / Device Role / Timing Role: Unity-gain buffer isolating multiplexer output; settles to 0.01% in 520ns per datasheet tS spec. Use Value: 10V/µs slew rate prevents distortion on 5V step inputs; rail-to-rail output guarantees full 5V swing into 10kΩ ADC input. |
Use Scenario: Signal chain in battery-operated pH meter with 0–4.2V Li-ion supply and µV-level electrode signals. IC Role / Device Role / Timing Role: First-stage PGA (G=1000) and second-stage LPF; powered directly from battery without LDO. Use Value: 2.7V minimum supply allows operation down to 3.0V battery voltage; 3.5mA per amp minimizes quiescent drain. |
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 |
|---|---|---|---|
| OP4177ARUZ | Lower 600nV max VOS but 1.3MHz GBW; 1.2mA/amplifier supply current; only available in TSSOP-14. | Better DC precision for strain-gauge bridges; insufficient bandwidth for >10kHz active filters or fast ADC drivers. | Select when ultra-low offset dominates over speed; avoid for >100kHz signal paths. |
| TLV2464CDR | 2.2MHz GBW, 1.5V/µs slew, 1.2mA/amplifier; rail-to-rail I/O; 1.8–6V supply only; 1.5mV max VOS. | Optimized for ultra-low-power 3.3V systems; lacks drive strength (15mA) and CMRR (90dB) for industrial sensors. | Select for cost-sensitive, low-speed portable devices where 35mA drive and 106dB CMRR are unnecessary. |
Compared with OP4177ARUZ and TLV2464CDR, LT1631IS#PBF uniquely balances 30MHz bandwidth, rail-to-rail operation, 35mA drive, and 106dB CMRR in a single I-grade SO-14 package - making it the only option for high-speed, high-precision, wide-supply industrial signal chains.
Availability
LT1631IS#PBF is available at Aetrix Electronics and suitable for active filter design, rail-to-rail sensor buffering, A/D converter driving, and battery-powered instrumentation requiring stable component supply across industrial temperature ranges.
Supply support for LT1631IS#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog ICs with rigorous testing and application-focused design.
The LT1630/LT1631 family was engineered for precision signal conditioning in space-constrained, wide-supply industrial and portable systems - emphasizing rail-to-rail dynamics, low distortion, and guaranteed performance across –40°C to +85°C.
FAQ
What is the maximum operating temperature range for LT1631IS#PBF?
The LT1631IS#PBF is rated for –40°C to +85°C (I-grade), with all key parameters - including 525µV max input offset voltage, 30MHz gain-bandwidth product, and 10V/µs slew rate - guaranteed across this full industrial temperature range per datasheet Note 4.
Does LT1631IS#PBF support true rail-to-rail input with 3V single supply?
Yes, LT1631IS#PBF supports rail-to-rail input common-mode range from V– (0V) to V+ (3V) and rail-to-rail output swing within 15mV of both rails at light load. Its dual-input-stage architecture ensures continuous operation across the entire 0–3V range without phase reversal or increased distortion.
Can LT1631IS#PBF drive a 100Ω load reliably?
Yes, LT1631IS#PBF delivers ≥35mA output current per amplifier, enabling direct drive of 100Ω loads at ±10V output swing (±15V supply) or 3V output swing (3V supply). Output saturation voltage remains ≤1.5V at 35mA sink/source, verified in datasheet Figure 1630/31 G05–G06.
How does LT1631IS#PBF achieve 106dB CMRR?
LT1631IS#PBF achieves 106dB typical CMRR through patented independent trimming of its PNP and NPN input stages - one trimmed relative to V– and the other to V+. This compensates for process mismatches across the full input common-mode range, unlike conventional single-trim opamps.
Is LT1631IS#PBF pin-compatible with standard quad op amp footprints?
Yes, LT1631IS#PBF uses the industry-standard 14-pin SO package with the conventional quad op amp pinout (OUTA, –INA, +INA, V+, +INB, –INB, OUTB, OUTD, –IND, V–, +INC, –INC, OUTC, NC), matching LM324, TL074, and OP4177 footprints for drop-in replacement in existing layouts.
LT1631IS#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
LT1631IS#PBF FAQ
1.How can I place an order for LT1631IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1631IS#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 LT1631IS#PBF reliable?
The price and inventory of LT1631IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1631IS#PBF is usually 5 days.
3.What payment methods are accepted for LT1631IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1631IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1631IS#PBF?
LT1631IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1631IS#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 LT1631IS#PBF?
For technical support, including LT1631IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1631IS#PBF requirements.
6.How does Aetrix verify that LT1631IS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1631IS#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 LT1631IS#PBF meets industry standards.
7.What is the process for return or replacement of LT1631IS#PBF?
All LT1631IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1631IS#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 LT1631IS#PBF part is unused and in its original packaging.
Return procedure for LT1631IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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