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Analog Devices Inc./Maxim Integrated ICL7641BCJD
- Part No.:
- ICL7641BCJD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
ICL7641BCJD.pdf
- Description:
- IC CMOS 4 CIRCUIT 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:264
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Product details
Overview
ICL7641BCJD from Maxim Integrated is a quad CMOS operational amplifier optimized for ultra-low input bias current (1 pA typical), wide supply range (±1V to ±8V or 2V–16V single supply), and programmable quiescent current (10 µA/100 µA/1 mA per amplifier). It features 14-pin CERDIP packaging, 0°C to +70°C operating temperature, and is used in pH meters, photodiode amplifiers, and long-time-constant integrators where input leakage must be minimized.
For engineers reviewing the ICL7641BCJD datasheet, ICL7641BCJD pinout, ICL7641BCJD application, or ICL7641BCJD equivalent, key selection criteria include confirmed 1 pA bias current, 14-pin CERDIP thermal/mechanical reliability, ±0.98 V output swing at ±1 V supply, and verified compatibility with high-impedance sensor front-ends requiring sub-picoampere leakage control.
Technical Context
The ICL7641BCJD implements monolithic CMOS architecture with pin-selectable quiescent current via dedicated IQ control terminals on each amplifier section. Its input stage uses guarded P-channel MOSFETs to achieve 1 pA typical bias current and 10¹² Ω input resistance, enabling stable operation with source impedances >1 GΩ.
Unlike fixed-IQ duals (e.g., ICL7622), the ICL7641BCJD supports independent IQ configuration per channel - critical for mixed-signal systems balancing bandwidth (GBW = 1.4 MHz at 1 mA) against power (6 µA min per amp). It lacks offset null pins and external compensation, distinguishing it from ICL7614/ICL7631 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical - enables accurate measurement of picoamp-level photocurrents without signal corruption |
| Supply Voltage Range | ±1 V to ±8 V - supports ultra-low-voltage battery-powered designs and rail-to-rail compatible single-supply operation |
| Output Swing | ±0.98 V at ±1 V supply - delivers >98% rail utilization for maximum dynamic range in low-voltage systems |
| Unity-Gain Bandwidth | 1.4 MHz at 1 mA IQ - provides sufficient small-signal response for precision DC-coupled sensor conditioning |
| Input Resistance | 10¹² Ω - ensures minimal loading error when interfacing with high-Z sources like glass pH electrodes |
| Common-Mode Rejection | 80 dB minimum - maintains accuracy in noisy industrial environments with ground-referenced sensor signals |
| Quiescent Current | Programmable 10 µA / 100 µA / 1 mA per amplifier - allows trade-off between battery life and bandwidth per channel |
Pinout & Package
ICL7641BCJD is housed in a hermetically sealed 14-pin CERDIP (Ceramic Dual In-line Package) with metal lid, rated for 500 mW continuous power dissipation and suitable for high-reliability, extended-temperature industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | Inverting Input (–IN) | High-impedance differential input node for each of four amplifiers; requires guard ring layout to preserve 1 pA bias spec |
| 2, 6, 10, 14 | Non-Inverting Input (+IN) | Reference input for each amplifier; same 10¹² Ω impedance as –IN; sensitive to PCB contamination |
| 3, 7, 11, 12 | Output (OUT) | CMOS rail-swing output capable of sourcing/sinking current; swing within millivolts of rails under light load |
| 4 | V+ | Positive supply terminal - accepts up to +8 V (dual) or +16 V (single); decoupling capacitor required |
| 8 | V− | Negative supply terminal - accepts down to –8 V (dual) or ground (single); shared return path for all four amps |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical - preserves signal integrity in picoammeter and electrochemical sensor circuits |
| Wide supply voltage range | ±1 V to ±8 V - enables direct integration into coin-cell or single Li-ion powered instrumentation |
| Programmable quiescent current | Three discrete IQ settings per amplifier - permits per-channel optimization of speed vs. power in multi-function analog front-ends |
| High input impedance | 10¹² Ω - eliminates loading errors when amplifying signals from piezoelectric, photodiode, or pH electrode sources |
| Low noise current | 0.01 pA/√Hz - minimizes current-noise contribution in transimpedance amplifier configurations |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode measuring hydrogen ion activity in aqueous solutions. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage converting nanoamp-level electrode current into measurable voltage. Use Value: 1 pA bias current prevents electrode polarization drift; 10¹² Ω input resistance avoids signal attenuation across >100 MΩ electrode impedance. | Use Scenario: Converting weak photocurrent from low-light photodiodes into stable voltage output. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with programmable gain and bandwidth. Use Value: 0.01 pA/√Hz noise current ensures minimal added noise; rail-swing output maximizes SNR in low-voltage optical sensing systems. |
| Long-Time Constant Integrator | Low-Droop Sample/Hold Amplifier |
Use Scenario: Precision analog integration over seconds to minutes for energy metering or radiation dosimetry. IC Role / Device Role / Timing Role: Ultra-low-leakage integrator core using capacitor feedback and buffered output. Use Value: 1 pA input bias limits integration error to <1 mV/hour on 1 µF capacitor - enabling stable multi-minute time constants. | Use Scenario: Capturing and holding analog sensor outputs with minimal voltage decay during hold phase. IC Role / Device Role / Timing Role: High-input-impedance unity-gain buffer with low droop rate during hold interval. Use Value: Sub-picoampere bias current reduces droop to <10 µV/s on 10 nF hold capacitor - extending usable hold time beyond 10 seconds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L4ACN | Fixed 10 µA IQ; no programmable current; 14-pin PDIP only; 20 pA bias current (20× higher) | Limited to low-power, low-bandwidth use; unsuitable for picoamp-level signal integrity | Select only if strict 1 pA bias is not required and CERDIP packaging is unnecessary |
| OPA4277UA | Bipolar input; 3 nA bias current; ±15 V max supply; SOIC-14 package; no IQ programming | Higher precision VOS (25 µV) but incompatible with ultra-high-Z sources due to 3000× higher bias current | Choose for low-offset DC applications with moderate source impedance (<1 MΩ) |
Compared with TLC27L4ACN and OPA4277UA, the ICL7641BCJD uniquely delivers picoampere-level input bias in a hermetic CERDIP package with per-amplifier IQ control - making it irreplaceable for electrochemical, photonic, and ultra-long-integration applications demanding sub-pA leakage.
Availability
ICL7641BCJD is available at Aetrix Electronics and suitable for pH meter manufacturing, photodiode-based optical sensors, and low-leakage data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for ICL7641BCJD 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 test equipment markets.
The ICL7641BCJD belongs to the ICL761X–ICL764X family - designed specifically for ultra-low-input-current, wide-supply, low-power operational amplification in high-impedance sensor interface and precision analog measurement applications.
FAQ
What is the maximum supply voltage rating for the ICL7641BCJD?
The ICL7641BCJD has an absolute maximum total supply voltage (V+ to V−) rating of +18 V. Operation beyond this limit risks permanent damage. For reliable long-term use, the recommended operating range is ±1 V to ±8 V dual supply or 2 V to 16 V single supply, as specified in the electrical characteristics tables.
Does the ICL7641BCJD support offset nulling?
No, the ICL7641BCJD does not provide offset null pins. Unlike ICL7611/ICL7621 variants with dedicated OFFSET terminals, the ICL7641BCJD is a quad amplifier without internal offset trimming capability. System-level calibration or external nulling circuitry is required for applications demanding sub-millivolt offset performance.
Is the ICL7641BCJD internally compensated for unity-gain stability?
Yes, the ICL7641BCJD is internally compensated and stable in unity-gain configuration. It does not require external compensation components. This distinguishes it from externally compensated variants like the ICL7614, and simplifies design for standard buffer and gain-of-one applications.
What is the guaranteed input bias current specification for ICL7641BCJD over temperature?
Per the datasheet, the ICL7641BCJD guarantees a maximum input bias current of 500 pA at 0°C to +70°C (C grade). At +25°C, typical bias current is 1 pA, with a maximum of 4 nA at +125°C - though the ICL7641BCJD is rated only to +70°C, so 500 pA is the applicable max over its full operating range.
Can the ICL7641BCJD drive capacitive loads?
The ICL7641BCJD is not optimized for direct capacitive loading. Stability is not guaranteed for loads >100 pF. For larger capacitive loads (e.g., ADC input capacitance), a series isolation resistor (≥1 kΩ) is recommended. Very large capacitors (>10 µF) may stabilize the output due to dominant-pole formation, but this degrades transient response and is not a recommended design practice for the ICL7641BCJD.
ICL7641BCJD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 14-CDIP
ICL7641BCJD FAQ
1.How can I place an order for ICL7641BCJD through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7641BCJD 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 ICL7641BCJD reliable?
The price and inventory of ICL7641BCJD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7641BCJD is usually 5 days.
3.What payment methods are accepted for ICL7641BCJD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7641BCJD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7641BCJD?
ICL7641BCJD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7641BCJD 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 ICL7641BCJD?
For technical support, including ICL7641BCJD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7641BCJD requirements.
6.How does Aetrix verify that ICL7641BCJD is sourced from the original manufacturer or authorized distributors?
All ICL7641BCJD 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 ICL7641BCJD meets industry standards.
7.What is the process for return or replacement of ICL7641BCJD?
All ICL7641BCJD units undergo pre-shipment inspection (PSI). If there is an issue with ICL7641BCJD, 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 ICL7641BCJD part is unused and in its original packaging.
Return procedure for ICL7641BCJD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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