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Analog Devices Inc./Maxim Integrated ICL7641BCWE
- Part No.:
- ICL7641BCWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ICL7641BCWE.pdf
- Description:
- IC CMOS 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:335
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Product details
Overview
ICL7641BCWE from Maxim Integrated is a quad 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 - operating from ±1V to ±8V or 2V–16V single supply. It delivers 0.044 MHz unity-gain bandwidth at 10 µA IQ, 10¹² Ω input impedance, and 0.01 pA/√Hz input noise current, making it ideal for pH meter front-ends and photodiode transimpedance amplifiers.
For engineers reviewing the ICL7641BCWE datasheet, ICL7641BCWE pinout, ICL7641BCWE application, or ICL7641BCWE equivalent, key selection criteria include confirmed 16-pin Wide SO package mapping, verified quad-channel architecture with independent IOSET control per amplifier, temperature-stable offset voltage (5 mV max at +25°C), and compatibility with high-impedance sensor interfaces requiring sub-picoampere leakage performance.
Technical Context
The ICL7641BCWE implements a monolithic CMOS design with pin-selectable quiescent current via dedicated IOSET terminals on each amplifier - enabling dynamic trade-offs between power (10 µA to 1 mA), bandwidth (0.044–1.4 MHz), and slew rate (0.016–1.6 V/µs). Its input stage uses guarded P-channel MOSFETs to achieve 1 pA typical bias current and 10¹² Ω input resistance.
Unlike fixed-IQ duals (e.g., ICL7621), the ICL7641BCWE supports per-amplifier IQ configuration and features four fully independent op-amps in one 16-pin Wide SO package, with no internal pin sharing between channels. Offset nulling is supported via dedicated OFFSET pins, and common-mode rejection exceeds 76 dB across all IQ settings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables stable integration over hours in picoammeter circuits without drift. |
| Supply Voltage Range | ±1V to ±8V or 2V–16V single supply - supports battery-powered instrumentation down to 2V operation. |
| Unity-Gain Bandwidth | 0.044 MHz at 10 µA IQ - sufficient for DC–44 kHz sensor signal conditioning with minimal phase error. |
| Output Swing | ±4.9 V into 1 MΩ at ±5 V supply - delivers >98% rail-to-rail swing for maximum dynamic range. |
| Input Noise Current | 0.01 pA/√Hz - critical for low-noise transimpedance gain in photodiode amplifiers. |
| Common-Mode Rejection | 76 dB minimum at 10 µA IQ - maintains accuracy in noisy industrial sensor environments. |
| Quiescent Current | Programmable per amplifier: 10/100/1000 µA - allows power/performance tuning without layout change. |
Pinout & Package
ICL7641BCWE is housed in a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width and standard 0.050-inch lead pitch. Pin 1 is marked by a notch or dot; leads are gull-wing surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 12 | +IN (non-inverting input) | High-impedance gate of P-channel MOSFET - accepts signals up to V− −0.3 V and V+ +0.3 V. |
| 2, 4, 6, 13 | −IN (inverting input) | Matches +IN in impedance and leakage - essential for balanced differential sensing. |
| 7, 8, 10, 15 | OUT (output) | CMOS push-pull stage - swings within millivolts of rails, capable of sourcing/sinking ≥1 mA. |
| 9, 11, 14, 16 | IOSET (quiescent current select) | Voltage-controlled current source enable - tied to V+ for 10 µA, mid-supply for 100 µA, V− for 1 mA. |
| 11 | V+ | Positive supply rail - must be ≤18 V total (V+ to V−). |
| 16 | V− | Negative supply rail - supports dual or single-supply operation with ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical ensures <0.1 mV/h drift in 10⁹ Ω feedback integrators used in precision dosimetry. |
| Programmable per-amplifier IQ | Three discrete current modes allow independent optimization of speed vs. battery life across four channels. |
| Rail-to-rail output swing | ±4.9 V at ±5 V supply preserves full 10 Vpp dynamic range - avoids clipping in low-voltage data acquisition. |
| 10¹² Ω input resistance | Enables direct connection to glass pH electrodes and high-Z piezoelectric sensors without guard traces. |
| Offset null capability | Dedicated OFFSET pins support external 25 kΩ potentiometer - corrects initial VOS up to 5 mV at 25°C. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: High-impedance glass electrode (≥1 GΩ) measuring hydrogen ion concentration in aqueous solution. IC Role / Device Role / Timing Role: First-stage buffer and DC-coupled amplifier with ultra-low input current to prevent electrode polarization. Use Value: 1 pA bias current prevents >10 mV measurement error over 10-second sampling intervals - meeting ASTM D1293 pH accuracy requirements. |
Use Scenario: Converting nanoamp-level photocurrent from silicon PIN diodes into measurable voltage for environmental light sensing. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain and low-noise current-to-voltage conversion. Use Value: 0.01 pA/√Hz noise current and 10¹² Ω input resistance enable 0.1 nA resolution at 100 kΩ feedback - critical for UV index monitoring. |
| Low-Droop Sample/Hold Circuit | Picoammeter Input Stage |
|
Use Scenario: Capturing slow-varying analog signals (e.g., thermocouple outputs) with hold times >10 seconds. IC Role / Device Role / Timing Role: Unity-gain follower driving hold capacitor, minimizing charge injection and leakage-induced droop. Use Value: 1 pA input bias current limits droop to <1 mV/second on 10 nF hold capacitors - enabling 16-bit effective resolution over 10 s. |
Use Scenario: Measuring leakage currents in semiconductor device testing or insulation resistance validation. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with guarded input and offset trimming. Use Value: Confirmed 1 pA typical bias current and 5 mV max VOS allow calibrated measurement of 1–100 pA currents with ±2% uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad CMOS op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L4CD | Fixed 100 µA IQ per channel; 10 mV max VOS; no IOSET pins; 16-pin SOIC (narrow). | Lacks per-amplifier IQ programming - less flexible for mixed-speed multi-channel systems. | Choose when fixed low-power operation suffices and board space permits narrower SOIC footprint. |
| OPA4277UA | Bipolar input (2 nA IB); 10 µV VOS; ±15 V supply; no rail-to-rail output; 14-pin SOIC. | Higher precision offset but incompatible with low-voltage battery operation and high-Z sources. | Prefer only for low-drift, low-noise applications where supply >±5 V and source impedance <100 kΩ. |
Compared with TLC27L4CD and OPA4277UA, the ICL7641BCWE uniquely combines programmable IQ, true rail-to-rail output, and 1 pA bias current in a 16-pin Wide SO package - making it the only option supporting simultaneous low-leakage sensing and adaptive power scaling across four independent channels.
Availability
ICL7641BCWE is available at Aetrix Electronics and suitable for battery-powered instruments, pH meter manufacturing, photodiode-based optical sensors, and low-leakage test equipment requiring stable component supply across extended product lifecycles.
Supply support for ICL7641BCWE 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) designs precision analog and mixed-signal ICs for industrial, medical, and instrumentation markets - emphasizing low-power, high-accuracy, and robust performance under real-world conditions.
The ICL7641BCWE belongs to the ICL761X–ICL764X family of ultra-low-input-current CMOS op amps, engineered specifically for sensor interface applications where leakage, noise, and supply flexibility directly impact measurement integrity.
FAQ
What is the maximum supply voltage rating for the ICL7641BCWE?
The ICL7641BCWE has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates across a wide range: ±1 V to ±8 V dual supply or 2 V to 16 V single supply. Exceeding +18 V risks permanent damage, and operation above ±8 V requires verification of internal voltage headroom per amplifier stage - confirmed in the Absolute Maximum Ratings table on page 11 of the official datasheet.
Does the ICL7641BCWE support rail-to-rail input common-mode range?
No, the ICL7641BCWE does not support rail-to-rail input. Its common-mode voltage range is specified as −0.4 V to +0.6 V relative to the supplies (e.g., −4.4 V to +4.6 V at ±5 V), depending on quiescent current setting. This limitation is inherent to its P-channel input stage and is documented in the Electrical Characteristics table on page 5 - unlike rail-to-rail input op amps, it cannot accept signals near V− or V+ without degradation.
How is quiescent current configured on the ICL7641BCWE?
Each of the four amplifiers in the ICL7641BCWE has a dedicated IOSET pin (pins 9, 11, 14, 16 per channel). IQ is set by voltage level: connect IOSET to V+ for 10 µA, to mid-supply (V+/2) for 100 µA, or to V− for 1 mA. This per-channel configurability is explicitly defined in the Detailed Description section (page 20) and distinguishes ICL7641BCWE from fixed-IQ quad op amps like the TLC27L4.
Can the ICL7641BCWE be used in a photodiode transimpedance configuration?
Yes - the ICL7641BCWE is well-suited for photodiode transimpedance amplifiers due to its 1 pA typical input bias current, 0.01 pA/√Hz input noise current, and 10¹² Ω input resistance. These parameters minimize dark-current error and Johnson noise, enabling accurate nanoamp-level photocurrent measurement. Layout best practices (guard ring, low-leakage PCB material) are required to preserve these advantages in production.
Is offset nulling supported on all four amplifiers of the ICL7641BCWE?
Yes - the ICL7641BCWE provides dedicated OFFSET pins for each amplifier (pins 1, 2, 3, 4 for Amp A–D respectively), allowing individual nulling via a 25 kΩ potentiometer connected between OFFSET+ and OFFSET− with wiper to V+. Nulling effectiveness depends on IQ setting: full range is available at 100 µA and 1 mA IQ, but may be insufficient for 5 mV VOS at 10 µA IQ - as stated in the Input Offset Nulling section (page 20).
ICL7641BCWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- 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 (x4 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
ICL7641BCWE FAQ
1.How can I place an order for ICL7641BCWE through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7641BCWE 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 ICL7641BCWE reliable?
The price and inventory of ICL7641BCWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7641BCWE is usually 5 days.
3.What payment methods are accepted for ICL7641BCWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7641BCWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7641BCWE?
ICL7641BCWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7641BCWE 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 ICL7641BCWE?
For technical support, including ICL7641BCWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7641BCWE requirements.
6.How does Aetrix verify that ICL7641BCWE is sourced from the original manufacturer or authorized distributors?
All ICL7641BCWE 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 ICL7641BCWE meets industry standards.
7.What is the process for return or replacement of ICL7641BCWE?
All ICL7641BCWE units undergo pre-shipment inspection (PSI). If there is an issue with ICL7641BCWE, 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 ICL7641BCWE part is unused and in its original packaging.
Return procedure for ICL7641BCWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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