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Analog Devices Inc./Maxim Integrated ICL7641ECPD+
- Part No.:
- ICL7641ECPD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7641ECPD+.pdf
- Description:
- IC CMOS 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,124
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Product details
Overview
ICL7641ECPD+ 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 targets high-impedance sensor interfaces including pH meters and photodiode amplifiers, where input leakage and long time constants are critical.
For engineers reviewing the ICL7641ECPD+ datasheet, ICL7641ECPD+ pinout, ICL7641ECPD+ application, or ICL7641ECPD+ equivalent, key selection criteria include confirmed 14-pin plastic DIP package, -40°C to +85°C temperature range, 1 pA input bias current at +25°C, and verified programmable IQ control via external voltage on dedicated pins - all validated in Maxim's official ICL761X–ICL764X family datasheet (Rev 4, July 2021).
Technical Context
The ICL7641ECPD+ implements monolithic CMOS architecture with pin-selectable quiescent current, enabling trade-offs between power (10 µA min) and performance (1.4 MHz GBW at 1 mA). Its input stage features 10¹² Ω input impedance and 0.01 pA/√Hz noise current, supporting direct connection to high-Z sources without guard rings or bootstrapping.
Unlike dual or quad variants with fixed IQ, the ICL7641 supports externally controlled quiescent current per amplifier via dedicated IOC pins - a feature shared only with ICL7611/ICL7631 singles/triples. Output stage delivers millivolt-level rail-to-rail swing under 1 MΩ load, with slew rate scaling linearly from 0.016 V/µs (10 µA) to 1.6 V/µs (1 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables picoampere-level signal integrity in photodiode/pH electrode front-ends |
| Supply Voltage Range | ±1V to ±8V or 2V–16V single supply - supports battery-powered and industrial low-voltage systems |
| Quiescent Current | Programmable: 10/100/1000 µA per amplifier - allows dynamic bandwidth/slew-rate/power optimization |
| Unity-Gain Bandwidth | 1.4 MHz at 1 mA IQ - sufficient for precision DC–100 kHz sensor conditioning |
| Input Impedance | 10¹² Ω - prevents loading of high-impedance transducers (e.g., glass pH electrodes) |
| Output Swing | ±4.9 V into 1 MΩ at ±5 V supply - delivers >98% rail-to-rail dynamic range for maximum ADC utilization |
| Input Noise Current | 0.01 pA/√Hz at 1 kHz - minimizes current-noise-induced errors in high-Z current-mode sensors |
Pinout & Package
ICL7641ECPD+ is housed in a 14-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | IOC (Current Set) | Voltage level selects 10 µA (to V+), 100 µA (mid-supply), or 1 mA (to V−) per amplifier |
| 2, 6, 10, 14 | Inverting Input (−IN) | Differential input terminal for each of four amplifiers |
| 3, 7, 11, 12 | Non-Inverting Input (+IN) | Differential input terminal for each of four amplifiers |
| 4, 8 | V− (Negative Supply) | Common negative rail connection for all four amplifiers |
| 16 | V+ (Positive Supply) | Common positive rail connection for all four amplifiers |
| 15 | NC | No internal connection - must be left unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical ensures <1 mV error across 1 GΩ source impedance at 25°C |
| Programmable quiescent current | Three discrete IQ settings enable precise power/performance tuning per channel |
| Rail-to-rail output swing | ±4.9 V into 1 MΩ at ±5 V supply maximizes dynamic range for 12-bit+ ADCs |
| High input impedance | 10¹² Ω eliminates need for input buffering in pH meter and piezoelectric sensor circuits |
| Low input noise current | 0.01 pA/√Hz preserves SNR in photodiode transimpedance amplifiers up to 100 kHz |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode (≥1 GΩ) measuring hydrogen ion activity in aqueous solutions. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and offset-adjusted amplifier with ultra-low input leakage. Use Value: 1 pA bias current limits measurement drift to <0.1 mV/hour, enabling stable 0.01 pH resolution over 24-hour monitoring. |
Use Scenario: Converting weak photocurrent (10 pA–1 nA) from silicon photodiodes into measurable voltage. IC Role / Device Role / Timing Role: Low-noise, high-Z transimpedance amplifier with programmable gain bandwidth. Use Value: 0.01 pA/√Hz noise current and 10¹² Ω input resistance maintain >70 dB SNR at 1 kHz for 100 pA signals. |
| Long-Time Constant Integrator | Low-Droop Sample/Hold Amplifier |
Use Scenario: Building analog integrators with time constants ≥100 seconds for energy metering or radiation dosimetry. IC Role / Device Role / Timing Role: Integrator core with minimized input bias-induced voltage ramp error. Use Value: 1 pA input bias current yields <0.36 mV/hour integrator drift at 1 µF capacitor - 10× lower than bipolar alternatives. |
Use Scenario: Holding analog sensor outputs during ADC conversion cycles in portable instrumentation. IC Role / Device Role / Timing Role: Unity-gain buffer with ultra-low input current to minimize hold-mode droop. Use Value: 1 pA bias current limits droop rate to <3.6 µV/s across 1 µF hold capacitor - enabling 16-bit accuracy over 100 ms holds. |
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 |
|---|---|---|---|
| TLC27M4CD | Fixed 20 µA IQ, 1.7 MHz GBW, 20 pA bias current - no programmable IQ | Higher power, higher noise current - unsuitable for picoampere-level photodiode or pH sensing | Select when fixed low-power operation suffices and 20 pA bias is acceptable |
| OPA4277UA | Bipolar input, 3 nA bias current, ±15 V max supply - no rail-to-rail output | Higher precision offset (25 µV) but incompatible with low-voltage battery systems | Select for high-accuracy industrial signal chains requiring sub-10 µV offset, not ultra-low bias |
Compared with TLC27M4CD and OPA4277UA, the ICL7641ECPD+ uniquely combines programmable IQ, 1 pA bias current, and rail-to-rail output in a 14-pin DIP - making it irreplaceable for battery-powered, high-impedance sensor front-ends demanding both ultra-low leakage and flexible power scaling.
Availability
ICL7641ECPD+ is available at Aetrix Electronics and suitable for pH meter design, photodiode signal conditioning, long-time constant integration, and low-droop sample/hold amplifier applications requiring stable component supply across extended production lifecycles.
Supply support for ICL7641ECPD+ 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, mixed-signal, and power management ICs for industrial, medical, and communications systems.
The ICL7641ECPD+ belongs to the ICL761X–ICL764X family - engineered specifically for ultra-low-input-current, low-power, wide-supply op amp applications in high-impedance sensor interfacing and precision analog signal conditioning.
FAQ
What is the operating temperature range for ICL7641ECPD+?
The ICL7641ECPD+ is rated for -40°C to +85°C ambient operation (E-grade), validated per Maxim's official datasheet Rev 4. This range supports industrial and automotive cabin applications where thermal stability of input bias current (<4000 pA max at +85°C) and offset voltage (<20 mV max) is critical for reliable sensor signal integrity.
Does ICL7641ECPD+ support rail-to-rail input common-mode range?
No - the ICL7641ECPD+ has a limited common-mode input range of -0.4 V to +0.6 V relative to V− and V+, respectively, at 10 µA IQ. It does not feature rail-to-rail input; its strength lies in rail-to-rail *output* swing and ultra-low input bias current, not input voltage range extension.
How is quiescent current programmed on ICL7641ECPD+?
Each of the four amplifiers in ICL7641ECPD+ uses a dedicated IOC pin (pins 1, 5, 9, 13) to set quiescent current: connect to V+ for 10 µA, to mid-supply (V+/2) for 100 µA, or to V− for 1000 µA. This per-amplifier control enables mixed-mode operation - e.g., one channel at 10 µA for standby sensing, another at 1 mA for active signal processing.
Is ICL7641ECPD+ pin-compatible with other ICL76XX quad op amps?
Yes - ICL7641ECPD+ shares identical 14-pin DIP pinout and function mapping with ICL7642ECPD+ and ICL764XECPD variants. All use pins 1/5/9/13 for IOC, pins 2/6/10/14 for −IN, pins 3/7/11/12 for +IN, pin 4/8 for V−, and pin 16 for V+. Pin 15 is NC across the family.
What is the maximum supply voltage rating for ICL7641ECPD+?
The absolute maximum total supply voltage (V+ to V−) for ICL7641ECPD+ is +18 V, with recommended operating range of ±1 V to ±8 V (or 2 V–16 V single supply). Exceeding +18 V risks permanent damage; operation at ±8 V is validated for full parameter performance including output swing and CMRR.
ICL7641ECPD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 20 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-PDIP
ICL7641ECPD+ FAQ
1.How can I place an order for ICL7641ECPD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7641ECPD+ 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 ICL7641ECPD+ reliable?
The price and inventory of ICL7641ECPD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7641ECPD+ is usually 5 days.
3.What payment methods are accepted for ICL7641ECPD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7641ECPD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7641ECPD+?
ICL7641ECPD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7641ECPD+ 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 ICL7641ECPD+?
For technical support, including ICL7641ECPD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7641ECPD+ requirements.
6.How does Aetrix verify that ICL7641ECPD+ is sourced from the original manufacturer or authorized distributors?
All ICL7641ECPD+ 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 ICL7641ECPD+ meets industry standards.
7.What is the process for return or replacement of ICL7641ECPD+?
All ICL7641ECPD+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7641ECPD+, 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 ICL7641ECPD+ part is unused and in its original packaging.
Return procedure for ICL7641ECPD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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