My Inquiry
My Account
Analog Devices Inc./Maxim Integrated ICL7631BCSE
- Part No.:
- ICL7631BCSE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7631BCSE.pdf
- Description:
- IC CMOS 3 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,247
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ICL7631BCSE from Maxim Integrated is a triple monolithic CMOS operational amplifier optimized for ultra-low input bias current (1 pA typical), programmable quiescent current (10/100/1000 µA per amplifier), and rail-to-rail output swing within millivolts of supply rails. It operates from ±1V to ±8V dual supplies or 2V–16V single supplies, and is specified for 0°C to +70°C operation in a 16-pin Small SO package. It is used in pH meter front-ends, photodiode transimpedance amplifiers, and low-leakage sample/hold circuits.
For engineers reviewing the ICL7631BCSE datasheet, ICL7631BCSE pinout, ICL7631BCSE application, or ICL7631BCSE equivalent, key selection criteria include confirmed 1 pA input bias current at +25°C, 5 mV max input offset voltage (B-grade), programmable IQ configuration, 10¹² Ω input impedance, and verified compatibility with high-impedance sensor interfaces requiring minimal loading.
Technical Context
The ICL7631BCSE implements a pin-selectable quiescent current architecture where the IOC SET pin determines operating current per amplifier-10 µA (IOC tied to V+), 100 µA (IOC biased between V−+0.8V and V+−0.8V), or 1 mA (IOC tied to V−). This directly scales unity-gain bandwidth (0.044/0.48/1.4 MHz) and slew rate (0.016/0.16/1.6 V/µs) while preserving rail-to-rail output swing and 10¹² Ω input resistance.
It features internal frequency compensation for stable unity-gain operation, offset null capability via dedicated OFFSET pins (pins 5 and 15 internally connected), and common-mode input range extending to within 0.4 V of either rail at IQ = 10 µA. Input-referred noise is 100 nV/√Hz and 0.01 pA/√Hz, enabling precision DC-coupled signal conditioning in high-Z sensor paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables integration with >1 GΩ source impedances without measurable error. |
| Input Offset Voltage | 5 mV max at +25°C (B-grade) - supports accurate DC amplification in low-gain sensor interfaces. |
| Supply Range | ±1V to ±8V dual or 2V–16V single - accommodates battery-powered and industrial supply rails. |
| Output Swing | ±4.9 V into 1 MΩ at ±5 V supply - delivers near rail-to-rail dynamic range for maximum signal utilization. |
| Unity-Gain Bandwidth | 0.044 MHz at 10 µA IQ - sufficient for sub-10 kHz precision instrumentation with ultra-low power. |
| Input Impedance | 10¹² Ω - prevents loading of high-impedance sources like glass pH electrodes or photodiodes. |
| Noise Current Density | 0.01 pA/√Hz at 1 kHz - critical for minimizing current noise in transimpedance amplifier designs. |
Pinout & Package
ICL7631BCSE is housed in a 16-pin Small Outline (SO) package with gull-wing leads, JEDEC MS-012AC compliant, body size 10.3 mm × 7.5 mm, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - rail-to-rail CMOS output stage capable of sourcing/sinking up to 10 mA. |
| 2 | IOC SET A | Quiescent current select for Amp A - connect to V+, mid-rail, or V− to set 10/100/1000 µA. |
| 3 | +INA | Inverting input of Amp A - high-impedance CMOS input with 1 pA bias current. |
| 4 | −INA | Non-inverting input of Amp A - matched to +INA for offset nulling via external potentiometer. |
| 5 | N.C. | No connection - internally tied to Pin 15 (OFFSET); not to be externally wired. |
| 6 | V+ | Positive supply rail - accepts up to +8 V (dual) or +16 V (single). |
| 7 | −INB | Non-inverting input of Amp B - electrically identical to −INA with same bias and offset specs. |
| 8 | +INB | Inverting input of Amp B - used with −INB for differential gain stages or independent buffering. |
| 9 | IOC SET B | Quiescent current select for Amp B - independently configurable from Amp A. |
| 10 | OUTB | Amplifier B output - fully independent output stage with same drive capability as OUTA. |
| 11 | +INC | Inverting input of Amp C - third channel for multi-sensor signal conditioning or active filtering. |
| 12 | −INC | Non-inverting input of Amp C - supports offset nulling and high-precision DC coupling. |
| 13 | IOC SET C | Quiescent current select for Amp C - enables mixed-power operation across channels. |
| 14 | OUTC | Amplifier C output - rail-to-rail output compatible with 10 kΩ minimum load. |
| 15 | OFFSET | Offset null common node - internally connected to Pin 5; connects wiper of 25 kΩ pot to V+ for trimming. |
| 16 | V− | Negative supply rail - accepts down to −8 V (dual) or ground (single-supply mode). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Quiescent Current | Three discrete IQ settings (10/100/1000 µA) per amplifier enable precise trade-off between power, bandwidth, and slew rate. |
| Rail-to-Rail Output Swing | Swings within 20 mV of V+ and V− at light loads - maximizes dynamic range in low-voltage systems. |
| Ultra-Low Input Bias Current | 1 pA typical ensures negligible error in picoamp-level current measurement and high-Z integrator applications. |
| Offset Null Capability | Dedicated OFFSET pins allow trimming of input offset voltage to <100 µV - critical for precision DC amplification. |
| High Input Impedance | 10¹² Ω input resistance prevents signal attenuation when interfacing with pH electrodes or photodiodes. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Measuring hydrogen ion concentration in aqueous solutions using a glass electrode with >10¹² Ω output impedance. IC Role / Device Role / Timing Role: ICL7631BCSE serves as the first-stage buffer and DC-coupled amplifier, rejecting electrode leakage and maintaining signal integrity. Use Value: 1 pA input bias current prevents electrode polarization drift; 10¹² Ω input impedance avoids signal attenuation. | Use Scenario: Converting weak photocurrents (pA–nA range) from silicon or InGaAs photodiodes into measurable voltage signals. IC Role / Device Role / Timing Role: ICL7631BCSE operates as a low-noise transimpedance amplifier with programmable gain and bandwidth. Use Value: 0.01 pA/√Hz current noise minimizes contribution to total system noise floor; rail-to-rail output supports wide dynamic range. |
| Low-Droop Sample/Hold Circuit | Picoammeter Input Stage |
Use Scenario: Capturing and holding analog sensor outputs for ADC conversion in portable instrumentation with multi-second hold times. IC Role / Device Role / Timing Role: ICL7631BCSE buffers the hold capacitor and provides ultra-low leakage path during hold phase. Use Value: Sub-picoamp input bias current limits droop to <1 mV/s at 1 µF hold capacitance - extends usable hold time. | Use Scenario: Measuring extremely low currents (e.g., dark current in detectors, leakage in insulation testing) with femtoamp resolution. IC Role / Device Role / Timing Role: ICL7631BCSE functions as the primary current-to-voltage converter with guarded input and shielded layout support. Use Value: Confirmed 1 pA typical bias current enables accurate picoampere measurement without correction algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-input-bias-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CSW#PBF | Chopper-stabilized, 0.005 µV/°C VOS drift vs. ICL7631BCSE's 15 µV/°C; higher supply current (170 µA) and no IQ programming. | Better DC precision over temperature; unsuitable for battery life-critical designs due to fixed higher power. | Select LTC1050CSW#PBF only when ultra-low offset drift dominates over power and programmability requirements. |
| TLC27L4CDR | Single-supply only (3–16 V), 0.6 pA IB (typ), but no offset null pins and lower CMRR (70 dB vs. 76 dB min). | Lower cost and smaller footprint (14-pin SO), but lacks independent channel IQ control and offset trimming capability. | Choose TLC27L4CDR for cost-sensitive, single-supply-only applications where offset nulling is not required. |
Compared with LTC1050CSW#PBF and TLC27L4CDR, the ICL7631BCSE uniquely combines programmable quiescent current per amplifier, offset null capability, and guaranteed 1 pA input bias current in a triple configuration - making it optimal for multi-channel, battery-powered, high-impedance sensor systems demanding design flexibility and long-term stability.
Availability
ICL7631BCSE is available at Aetrix Electronics and suitable for pH meter manufacturing, photodiode-based optical sensing, and portable picoammeter design requiring stable component supply and full traceability.
Supply support for ICL7631BCSE 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 high-reliability ICs for industrial, medical, and automotive applications.
The ICL76xx family was designed specifically for ultra-low-input-current signal conditioning in high-impedance sensor interfaces, emphasizing low power, rail-to-rail output, and robust performance across extended temperature ranges.
FAQ
What is the maximum supply voltage rating for the ICL7631BCSE?
The ICL7631BCSE has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates over a recommended range of ±1 V to ±8 V for dual supplies or 2 V to 16 V for single supplies. Exceeding +18 V risks permanent damage, and operation outside the recommended range may degrade parameters such as input bias current or output swing.
Does the ICL7631BCSE support offset nulling, and how is it implemented?
Yes, the ICL7631BCSE supports offset nulling via dedicated OFFSET pins (Pin 5 and Pin 15, internally connected). A 25 kΩ potentiometer is connected between the two OFFSET terminals, with its wiper tied to V+. This configuration allows trimming of input offset voltage to under 100 µV, especially effective at IQ = 100 µA or 1 mA. At IQ = 10 µA, nulling range may be insufficient for higher VOS grades.
Can the ICL7631BCSE be used in single-supply configurations, and what are the input/output limitations?
Yes, the ICL7631BCSE supports true single-supply operation from 2 V to 16 V. Its input common-mode range extends to within 0.4 V of V− (ground) and 0.6 V of V+ at IQ = 10 µA, and its output swings to within ~20 mV of both rails under light load. For rail-to-rail input capability, external level-shifting or biasing is required - the device itself does not feature RRI inputs.
What is the guaranteed input bias current specification for the ICL7631BCSE over temperature?
The ICL7631BCSE guarantees input bias current ≤500 pA over the full operating temperature range of 0°C to +70°C (C grade). At +25°C, typical IB is 1 pA, with a maximum of 50 pA. The increase over temperature reflects CMOS gate leakage behavior and remains well below 1 nA - critical for long-time-constant integrators and picoammeter front-ends.
How does quiescent current selection affect bandwidth and slew rate in the ICL7631BCSE?
Quiescent current directly scales small-signal performance: at IQ = 10 µA, unity-gain bandwidth is 0.044 MHz and slew rate is 0.016 V/µs; at 100 µA, they rise to 0.48 MHz and 0.16 V/µs; at 1 mA, to 1.4 MHz and 1.6 V/µs. This allows designers to optimize each amplifier channel independently - e.g., use 10 µA for low-power sensor buffering and 1 mA for fast output driving - without compromising other channels.
ICL7631BCSE 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:
- 5 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
ICL7631BCSE FAQ
1.How can I place an order for ICL7631BCSE through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7631BCSE 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 ICL7631BCSE reliable?
The price and inventory of ICL7631BCSE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7631BCSE is usually 5 days.
3.What payment methods are accepted for ICL7631BCSE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7631BCSE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7631BCSE?
ICL7631BCSE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7631BCSE 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 ICL7631BCSE?
For technical support, including ICL7631BCSE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7631BCSE requirements.
6.How does Aetrix verify that ICL7631BCSE is sourced from the original manufacturer or authorized distributors?
All ICL7631BCSE 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 ICL7631BCSE meets industry standards.
7.What is the process for return or replacement of ICL7631BCSE?
All ICL7631BCSE units undergo pre-shipment inspection (PSI). If there is an issue with ICL7631BCSE, 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 ICL7631BCSE part is unused and in its original packaging.
Return procedure for ICL7631BCSE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICL7631BCSE Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
