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Analog Devices Inc./Maxim Integrated ICL7611DCPA
- Part No.:
- ICL7611DCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7611DCPA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
ICL7611DCPA from Maxim Integrated is a single, ultra-low-input-bias-current CMOS operational amplifier with pin-selectable quiescent current (10 μA/100 μA/1 mA), ±1 V to ±8 V dual-supply operation (or 2–16 V single supply), 1 pA typical input bias current at +25°C, and rail-to-rail output swing within millivolts of supply rails - ideal for pH meter front-ends and picoammeter circuits.
For engineers reviewing the ICL7611DCPA datasheet, ICL7611DCPA pinout, ICL7611DCPA application, or ICL7611DCPA equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-critical context for low-leakage analog signal conditioning in battery-powered instrumentation and high-impedance sensor interfaces.
Technical Context
The ICL7611DCPA implements a monolithic CMOS architecture enabling programmable quiescent current via the IOSET pin, directly scaling unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs) while maintaining 10¹² Ω input impedance and 0.01 pA/√Hz input noise current.
It features internal frequency compensation for stable unity-gain operation, offset null capability via dedicated OFFSET pins, and extended common-mode voltage range (±5.3 V at IQ = 10 μA for ICL7611 variant), supporting precision DC-coupled amplification in low-power, high-source-impedance topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate integration and measurement with >1 GΩ source impedances without significant error drift |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single - supports operation from coin-cell batteries up to industrial rails |
| Quiescent Current Options | 10 μA / 100 μA / 1 mA - selectable via IOSET pin to trade power vs. bandwidth/slew rate per application need |
| Output Voltage Swing | ±4.8 V min (RL = 1 MΩ, VSUPP = ±5 V, TA ≤ +70°C) - delivers >96% rail utilization for maximum dynamic range |
| Input Offset Voltage | 15 mV max (TA ≤ +70°C) - specified for D-grade, enabling cost-sensitive low-drift designs with external nulling |
| Unity-Gain Bandwidth | 1.4 MHz at IQ = 1 mA - sufficient for kHz-range sensor signal conditioning with minimal phase lag |
| Common-Mode Rejection | 70 dB min at IQ = 1 mA - ensures stability against supply and reference noise in single-supply configurations |
Pinout & Package
ICL7611DCPA is housed in an 8-pin plastic DIP (Dual In-line Package) with industry-standard pinout compatible with legacy op-amp footprints. Pin 7 is internally connected to the case (ground reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET (pin 1) | Offset null connection - used with external potentiometer to trim input offset voltage |
| 2 | −IN | Inverting input - high-impedance CMOS node for feedback or differential sensing |
| 3 | +IN | Non-inverting input - accepts high-Z sensor signals (e.g., pH electrode, photodiode) |
| 4 | V− | Negative supply rail - referenced to system ground in single-supply configurations |
| 5 | IOSET | Quiescent current select - voltage level sets IQ to 10 μA, 100 μA, or 1 mA |
| 6 | OUTPUT | Amplified output - rail-to-rail capable, drives loads ≥10 kΩ at full IQ settings |
| 7 | Case/Ground | Internally tied to package case - provides EMI shielding and thermal path in DIP package |
| 8 | V+ | Positive supply rail - accepts up to +16 V in single-supply mode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typ. enables femtoampere-level current measurement without guard-ring PCB layout |
| Programmable quiescent current | Three discrete IQ settings allow precise optimization of power vs. speed for battery life or response time |
| Rail-to-rail output swing | Swings within <10 mV of V+ and V− - maximizes usable signal range in low-voltage systems |
| Internal unity-gain compensation | Stable at AV = 1 without external components - simplifies design for follower and gain-of-one buffers |
| Offset null capability | Dedicated OFFSET pins support <50 µV residual offset after trimming - critical for DC precision applications |
Applications
| pH Meter Front-End | Picoammeter Circuit |
|---|---|
Use Scenario: Amplifying microvolt-level output from glass pH electrodes with >100 MΩ source impedance in portable lab analyzers. IC Role / Device Role / Timing Role: High-impedance buffer and DC-coupled gain stage, rejecting leakage-induced offset drift. Use Value: 1 pA input bias current prevents electrode polarization error; 15 mV VOS allows calibration via OFFSET pins. | Use Scenario: Measuring sub-picoampere photocurrents from low-light photodiodes in environmental sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) input stage with guarded input and ultra-low IB compensation. Use Value: 0.01 pA/√Hz input noise current preserves SNR; 10¹² Ω RIN avoids signal attenuation at high source Z. |
| Low-Droop Sample/Hold | Hearing Aid Preamplifier |
Use Scenario: Holding analog sensor outputs for ADC sampling in energy-harvesting IoT nodes with multi-second hold times. IC Role / Device Role / Timing Role: Ultra-low-leakage integrator/held-node buffer minimizing voltage decay during hold phase. Use Value: 1 pA IB limits droop to <1 mV/s at 1 µF hold capacitor - extends usable hold duration by 10× vs. bipolar op-amps. | Use Scenario: First-stage amplification of electret microphone signals in hearing aids powered by zinc-air batteries. IC Role / Device Role / Timing Role: Low-noise, low-power preamplifier operating from 1.2 V single supply with rail-to-rail output. Use Value: 10 μA IQ mode enables >100-hour battery life; ±0.98 V swing at ±1 V supply preserves headroom for clipping-free audio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L1CP | Fixed 10 μA IQ, no programmability; 20 pA IB (typ), 10× higher than ICL7611DCPA | Limited to lower-impedance sources (<10 MΩ); unsuitable for picoammeter or pH electrode use | Select only when IB <10 pA is not required and pin count/layout compatibility is prioritized |
| OPA376AIDBVR | 25 nA IB (typ), 50× higher; 5.5 MHz GBW, 1000× faster; fixed 760 μA IQ | Better for AC-coupled, higher-speed biosensors but incompatible with femtoampere DC measurements | Choose for wideband sensor interfaces where ultra-low IB is secondary to bandwidth and noise performance |
Compared with TLC27L1CP and OPA376AIDBVR, the ICL7611DCPA uniquely delivers 1 pA input bias current with programmable IQ and rail-to-rail output in an 8-pin DIP - making it irreplaceable for DC-stable, ultra-high-impedance analog front-ends where leakage dominates error budgets.
Availability
ICL7611DCPA is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time-constant integrators requiring stable component supply across extended production lifecycles.
Supply support for ICL7611DCPA 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 demanding industrial, medical, and portable applications.
The ICL7611DCPA belongs to the ICL761X–ICL764X family - engineered specifically for ultra-low-input-current, low-power operational amplification in high-impedance, battery-constrained systems like portable test equipment and electrochemical sensors.
FAQ
What is the maximum supply voltage rating for the ICL7611DCPA?
The ICL7611DCPA 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 dual supply or 2–16 V single supply. Exceeding +18 V risks permanent damage, and operation near absolute maxima requires careful thermal derating per the 2 mW/°C dissipation limit for its 8-pin plastic DIP package.
How is quiescent current selected on the ICL7611DCPA?
The ICL7611DCPA uses its IOSET pin (Pin 5) to select quiescent current: connect to V+ for 10 μA, to a voltage between V− + 0.8 V and V+ − 0.8 V for 100 μA, or to V− for 1 mA. This selection directly scales unity-gain bandwidth and slew rate while preserving rail-to-rail output swing and ultra-low input bias current in all modes.
Does the ICL7611DCPA require external frequency compensation?
No - the ICL7611DCPA is internally compensated for stable unity-gain operation. Unlike the ICL7614 variant, it does not require an external capacitor between COMP and OUT pins. Its compensation is fixed and optimized for AV ≥ 1, eliminating layout complexity and component count in standard buffer and gain-of-one configurations.
Can the ICL7611DCPA be used in single-supply configurations?
Yes - the ICL7611DCPA 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. For optimal DC performance, tie V− to ground and bias inputs appropriately using reference dividers or charge pumps.
What is the purpose of the OFFSET pins on the ICL7611DCPA?
The OFFSET pins (Pins 1 and 5 in DIP configuration) allow external nulling of input offset voltage using a 25 kΩ potentiometer (wiper to V+). This feature enables residual VOS reduction below 50 µV - essential for precision DC amplification in applications like pH meters and low-drift integrators where offset drift must be minimized over temperature and time.
ICL7611DCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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:
- 15 mV
- Current - Supply:
- 1mA
- 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:
- 8-PDIP
ICL7611DCPA FAQ
1.How can I place an order for ICL7611DCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611DCPA 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 ICL7611DCPA reliable?
The price and inventory of ICL7611DCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611DCPA is usually 5 days.
3.What payment methods are accepted for ICL7611DCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611DCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611DCPA?
ICL7611DCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611DCPA 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 ICL7611DCPA?
For technical support, including ICL7611DCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611DCPA requirements.
6.How does Aetrix verify that ICL7611DCPA is sourced from the original manufacturer or authorized distributors?
All ICL7611DCPA 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 ICL7611DCPA meets industry standards.
7.What is the process for return or replacement of ICL7611DCPA?
All ICL7611DCPA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611DCPA, 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 ICL7611DCPA part is unused and in its original packaging.
Return procedure for ICL7611DCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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