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Analog Devices Inc./Maxim Integrated ICL7631CCSE
- Part No.:
- ICL7631CCSE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7631CCSE.pdf
- Description:
- IC CMOS 3 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
ICL7631CCSE from Maxim Integrated is a triple monolithic CMOS operational amplifier optimized for ultra-low input bias current (1 pA typical), programmable quiescent current (10 μA / 100 μA / 1 mA per amplifier), and rail-to-rail output swing (±4.8 V at ±5 V supply, RL = 1 MΩ). It operates from ±1 V to ±8 V dual supplies or 2 V to 16 V single supplies and features 10¹² Ω input impedance - ideal for pH meter front-ends and photodiode amplification.
For engineers reviewing the ICL7631CCSE datasheet, ICL7631CCSE pinout, ICL7631CCSE application, or ICL7631CCSE equivalent, this device delivers verified low-noise current (0.01 pA/√Hz), temperature-stable offset voltage (15 µV/°C max), and configurable bandwidth (0.044–1.4 MHz) across its three independent amplifiers in a 16-pin SOIC package.
Technical Context
The ICL7631CCSE implements a pin-selectable quiescent current architecture via dedicated IOC SET pins per amplifier, enabling dynamic trade-offs between power (10 μA to 1 mA per channel), bandwidth (0.044 MHz to 1.4 MHz), and slew rate (0.016 V/µs to 1.6 V/µs). Its CMOS input stage ensures 1 pA bias current and 10¹² Ω input resistance, critical for high-impedance sensor interfacing.
Each amplifier supports independent offset nulling using external 25 kΩ potentiometers across OFFSET terminals, with full nulling range guaranteed at IQ ≥ 100 μA. The device is internally compensated for unity-gain stability and requires no external compensation components - unlike the externally compensated ICL7614 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate measurement of picoamp-level photocurrents without signal corruption. |
| Input Impedance | 10¹² Ω - preserves signal integrity when driving from high-Z sources like glass pH electrodes or photodiodes. |
| Quiescent Current | Programmable per amplifier: 10 μA / 100 μA / 1 mA - allows power/bandwidth optimization per channel. |
| Output Voltage Swing | ±4.8 V at ±5 V supply, RL = 1 MΩ - delivers >96% rail-to-rail dynamic range for maximum signal fidelity. |
| Unity-Gain Bandwidth | 0.044 MHz (IQ = 10 μA) to 1.4 MHz (IQ = 1 mA) - scales linearly with supply current for predictable gain-bandwidth control. |
| Input-Referred Noise Current | 0.01 pA/√Hz at 1 kHz - minimizes current noise contribution in transimpedance amplifier configurations. |
| Common-Mode Rejection Ratio | 70–96 dB depending on IQ - maintains accuracy in noisy industrial environments with varying common-mode offsets. |
Pinout & Package
ICL7631CCSE is housed in a 16-pin Small Outline (SO) package (SA suffix), 3.9 mm × 9.9 mm body, 1.27 mm pitch, JEDEC MS-012AC compliant. Pin 1 marked by notch or dot; pin 5 and pin 15 internally connected to V−.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives loads up to 10 kΩ at 1 mA IQ with 1.6 V/µs slew rate. |
| 2 | IOC SET A | Quiescent current select for Amp A - connect to V+ (10 μA), mid-supply (100 μA), or V− (1 mA). |
| 3 | +INA | Inverting input of Amp A - high-impedance node for precision feedback networks. |
| 4 | OUTB | Amplifier B output - independently configurable; shares same IQ selection logic as Amp A. |
| 5 | V− | Negative supply rail - internally tied to pin 15; must be decoupled near package. |
| 6 | −INA | Non-inverting input of Amp A - referenced to V− for single-supply operation. |
| 7 | +INB | Inverting input of Amp B - isolated from Amp A for multi-channel signal conditioning. |
| 8 | IOC SET B | Quiescent current select for Amp B - identical function to pin 2, independent control. |
| 9 | −INB | Non-inverting input of Amp B - supports differential input configurations with matched layout. |
| 10 | OUTC | Amplifier C output - third independent channel; same performance specs as A/B. |
| 11 | +INC | Inverting input of Amp C - enables simultaneous 3-channel sensor buffering or filtering. |
| 12 | IOC SET C | Quiescent current select for Amp C - fully independent IQ programming per channel. |
| 13 | −INC | Non-inverting input of Amp C - completes triple-amplifier input set for compact analog front-ends. |
| 14 | +V+ | Positive supply rail - accepts 2 V to 16 V single or ±1 V to ±8 V dual supply. |
| 15 | V− | Negative supply rail - internal connection to pin 5; shared return path for all three amplifiers. |
| 16 | N.C. | No connect - unused silicon pad; leave floating or ground per PCB EMI mitigation strategy. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables direct coupling to >1 GΩ source impedances without measurable error. |
| Per-amplifier quiescent current control | Three discrete IQ settings (10/100/1000 μA) allow mixed-signal optimization - e.g., low-power sensing + high-speed signal path. |
| Rail-to-rail CMOS output stage | Swings within 20 mV of rails at light loads - maximizes dynamic range in battery-powered instrumentation. |
| Independent offset nulling | Dedicated OFFSET pins per amplifier support precise DC calibration without cross-channel interference. |
| Internal unity-gain compensation | No external capacitor required - simplifies layout and eliminates stability risks in space-constrained designs. |
| High input impedance (10¹² Ω) | Preserves signal amplitude from electrochemical sensors and piezoelectric transducers with minimal loading. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: High-impedance glass electrode (≥10¹⁰ Ω) measuring hydrogen ion concentration in aqueous solutions. IC Role / Device Role / Timing Role: First-stage buffer and DC-coupled amplifier conditioning microvolt-level electrode signals. Use Value: 1 pA input bias current prevents electrode polarization drift; 10¹² Ω input impedance avoids signal attenuation. |
Use Scenario: Converting nanoampere photocurrents from silicon photodiodes into measurable voltage outputs. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with programmable gain and bandwidth per channel. Use Value: 0.01 pA/√Hz noise current minimizes shot-noise amplification; rail-to-rail swing preserves full optical dynamic range. |
| Low-Droop Sample-and-Hold Circuit | Multi-Channel Sensor Signal Conditioning |
|
Use Scenario: Holding analog sensor outputs for ADC conversion in portable medical devices with >1-second hold times. IC Role / Device Role / Timing Role: Ultra-low-leakage buffer isolating hold capacitor from input/output paths. Use Value: 1 pA bias current limits droop to <1 mV/s at 1 µF hold capacitance - extends usable hold time. |
Use Scenario: Simultaneous amplification of thermocouple, RTD, and strain gauge signals in industrial data loggers. IC Role / Device Role / Timing Role: Triple-channel programmable-gain instrumentation amplifier front-end. Use Value: Independent IQ control allows 10 μA mode for thermocouple (low noise), 1 mA for strain gauge (fast settling). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-input-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1052CS8#PBF | Single-channel, auto-zero architecture; 0.1 pA bias current; fixed 1.2 mA supply; no IQ selection. | Superior DC precision but higher power; lacks multi-channel integration and programmable IQ. | Select when absolute offset drift (<0.05 µV/°C) outweighs power and channel count requirements. |
| OPA377AIDR | Single-channel, rail-to-rail I/O; 0.2 pA bias current; fixed 760 µA supply; 3 MHz GBW. | Higher bandwidth and lower noise voltage (7 nV/√Hz), but no quiescent current flexibility or triple configuration. | Select when wideband signal integrity is prioritized over ultra-low power and multi-channel consolidation. |
Compared with LTC1052CS8#PBF and OPA377AIDR, the ICL7631CCSE uniquely combines triple-channel integration, per-amplifier quiescent current programmability, and sub-picoamp bias current - enabling compact, power-optimized, multi-sensor analog front-ends unachievable with single-channel alternatives.
Availability
ICL7631CCSE is available at Aetrix Electronics and suitable for pH meters, photodiode amplifiers, low-droop sample-and-hold circuits, and multi-channel sensor signal conditioners requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7631CCSE 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and communications systems.
The ICL7631CCSE belongs to the ICL761X–ICL764X family - designed specifically for ultra-low-input-current, low-power, wide-supply-range operational amplification in high-impedance sensor interfaces and portable instrumentation.
FAQ
What is the maximum supply voltage rating for the ICL7631CCSE?
The ICL7631CCSE has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates across a wide functional range: ±1 V to ±8 V dual supplies or 2 V to 16 V single supplies. Exceeding +18 V risks permanent damage, and operation above ±8 V dual or 16 V single is not characterized or guaranteed per datasheet specifications.
How do I configure the quiescent current for each amplifier in the ICL7631CCSE?
Each amplifier in the ICL7631CCSE uses its dedicated IOC SET pin (pins 2, 8, 12) to set quiescent current: connect to V+ for 10 μA, to a mid-supply voltage (V− + 0.8 V to V+ − 0.8 V) for 100 μA, or to V− for 1 mA. This per-channel control allows independent optimization of bandwidth, slew rate, and power consumption across the three amplifiers in the ICL7631CCSE.
Does the ICL7631CCSE require external frequency compensation components?
No, the ICL7631CCSE is internally compensated for unity-gain stability and does not require external capacitors. Unlike the ICL7614 variant, it contains built-in compensation circuitry - eliminating layout complexity and ensuring robust stability across all gain configurations without additional components.
Can the ICL7631CCSE be used in single-supply configurations?
Yes, the ICL7631CCSE supports true single-supply operation from 2 V to 16 V. Its input common-mode range extends to within 0.4 V of V− and 0.6 V of V+, and its rail-to-rail output swings to within millivolts of both rails - enabling direct interfacing with microcontrollers and ADCs operating from the same supply.
What is the guaranteed input offset voltage specification for the ICL7631CCSE at room temperature?
The ICL7631CCSE (C-grade, 0°C to +70°C) has a guaranteed input offset voltage of 5 mV maximum at +25°C and 7 mV maximum across its full operating temperature range. This value corresponds to the "C" suffix in the part number and is validated per the ICL76XXC electrical characteristics table in the official datasheet.
ICL7631CCSE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 3
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.6V/µs
- Gain Bandwidth Product:
- 1.4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 10 mV
- Current - Supply:
- 1mA (x3 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ICL7631CCSE FAQ
1.How can I place an order for ICL7631CCSE through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7631CCSE 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 ICL7631CCSE reliable?
The price and inventory of ICL7631CCSE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7631CCSE is usually 5 days.
3.What payment methods are accepted for ICL7631CCSE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7631CCSE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7631CCSE?
ICL7631CCSE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7631CCSE 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 ICL7631CCSE?
For technical support, including ICL7631CCSE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7631CCSE requirements.
6.How does Aetrix verify that ICL7631CCSE is sourced from the original manufacturer or authorized distributors?
All ICL7631CCSE 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 ICL7631CCSE meets industry standards.
7.What is the process for return or replacement of ICL7631CCSE?
All ICL7631CCSE units undergo pre-shipment inspection (PSI). If there is an issue with ICL7631CCSE, 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 ICL7631CCSE part is unused and in its original packaging.
Return procedure for ICL7631CCSE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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