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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:2,424
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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 (10μA/100μA/1mA), ±1V to ±8V dual-supply or 2V–16V single-supply operation, and 1pA typical input bias current - ideal for pH meters, photodiode amplifiers, and picoammeters requiring femtoamp-level leakage control.
For engineers reviewing the ICL7611DCPA+ datasheet, ICL7611DCPA+ pinout, ICL7611DCPA+ application, or ICL7611DCPA+ equivalent, this device delivers verified low-noise current (0.01pA/√Hz), 10¹²Ω input impedance, programmable bandwidth (0.044–1.4MHz), and rail-to-rail output swing within millivolts of supply rails - critical for high-impedance sensor interfacing and battery-powered precision analog front-ends.
Technical Context
The ICL7611DCPA+ implements a monolithic CMOS architecture with externally configurable quiescent current via the IOSET pin, enabling trade-offs between power (10μA min) and performance (1.4MHz GBW at 1mA). Its input stage uses guarded, isolated MOSFETs to achieve 1pA bias current and 0.01pA/√Hz noise current.
It supports offset nulling via dedicated OFFSET pins and is internally compensated for unity-gain stability. The device operates across 0°C to +70°C and features rail-swing outputs (±4.8V on ±5V supplies, RL = 1MΩ) and extended common-mode range (±4.4V at IQ = 10μA) - optimized for low-voltage, high-source-impedance signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical (4nA max at +125°C) - enables stable integration over hours in picoampere-scale current measurement circuits. |
| Supply Voltage Range | ±1V to ±8V dual or 2V–16V single - supports direct interface with Li-ion, coin-cell, and industrial 3.3V/5V systems without level-shifting. |
| Quiescent Current | Pin-selectable: 10μA / 100μA / 1000μA - allows dynamic optimization of power vs. bandwidth (0.044–1.4MHz) per application demand. |
| Input Impedance | 10¹²Ω - preserves signal integrity when driving from >100MΩ sources like glass pH electrodes or unbiased photodiodes. |
| Output Swing | ±4.8V on ±5V supplies (RL = 1MΩ) - delivers >96% rail utilization for maximum dynamic range in low-voltage data acquisition. |
| Input Noise Current | 0.01pA/√Hz at 1kHz - minimizes current-noise-induced error in transimpedance amplifiers with RF > 1GΩ. |
Pinout & Package
ICL7611DCPA+ is housed in an 8-pin plastic DIP (Dual In-line Package) with industry-standard pinout and pin 7 internally connected to case ground - suitable for through-hole prototyping and legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to wiper of 25kΩ potentiometer for input offset voltage trimming; required for <2mV VOS calibration. |
| 2 | Inverting Input (–IN) | Differential input node; high-impedance gate of input MOSFET pair - sensitive to stray capacitance and leakage paths. |
| 3 | Non-Inverting Input (+IN) | Differential input node; matched to Pin 2 for common-mode rejection; guard ring recommended in layout. |
| 4 | V– | Negative supply terminal; must be decoupled locally with 0.1μF ceramic capacitor to minimize PSRR degradation. |
| 5 | IOSET | Quiescent current selection input: tie to V+ for 10μA, float (V–+0.8V to V+–0.8V) for 100μA, or tie to V– for 1mA. |
| 6 | Output | CMOS push-pull output stage; capable of ±4.8V swing into 1MΩ load - no external pull-ups needed for rail-to-rail behavior. |
| 7 | Case Ground | Internally bonded to package shell; must be connected to system ground plane to reduce EMI susceptibility and stabilize offset. |
| 8 | V+ | Positive supply terminal; accepts up to +8V (dual) or +16V (single); requires local 0.1μF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA typical enables accurate long-term integration in electrometer-grade circuits without drift compensation. |
| Programmable quiescent current | Three discrete IQ settings allow real-time power/performance tuning - e.g., 10μA for multi-year battery life, 1mA for fast-settling sample/hold. |
| Rail-to-rail output swing | Swings within 20mV of V+ and V– rails - maximizes usable ADC input range in 12-bit+ precision systems. |
| High input impedance | 10¹²Ω prevents loading of high-Z sensors (e.g., ion-selective electrodes), preserving signal fidelity and calibration stability. |
| Internal unity-gain compensation | Stable at AV = 1 without external components - simplifies design of buffers, active filters, and transimpedance stages. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode (≥1GΩ) measuring hydrogen ion activity in aqueous solution. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and offset-adjusted amplifier conditioning microvolt-level electrode potential. Use Value: 1pA bias current prevents electrode polarization error; 10¹²Ω input impedance avoids signal attenuation; offset nulling ensures <1mV baseline accuracy. | Use Scenario: Converting nanoampere photocurrent from unbiased silicon photodiode into measurable voltage. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with programmable gain and bandwidth. Use Value: 0.01pA/√Hz input noise current minimizes shot-noise amplification; 10μA IQ mode extends battery life in portable spectrometers. |
| Picoammeter Core Amplifier | Low-Droop Sample/Hold Circuit |
Use Scenario: Measuring leakage currents in semiconductor packaging or insulating materials (100fA–100pA range). IC Role / Device Role / Timing Role: Ultra-low-leakage integrator with guarded input and feedback capacitor. Use Value: Confirmed 1pA bias current enables sub-picoampere resolution; programmable IQ reduces die self-heating during long integration windows. | Use Scenario: Holding analog sensor output for ADC conversion in energy-constrained IoT nodes. IC Role / Device Role / Timing Role: Unity-gain follower with low droop rate (<1mV/s at 100pF hold capacitor). Use Value: 10¹²Ω input resistance limits charge leakage; rail-swing output ensures full-scale hold voltage retention over 100ms intervals. |
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 |
|---|---|---|---|
| LTC1050CN8#PBF | Chopper-stabilized topology; 0.005pA typical IB, but higher 1/f noise and 10μV VOS; requires external clock. | Better DC precision but unsuitable for wideband photodiode amps due to switching artifacts. | Select LTC1050CN8#PBF only when sub-100nV offset drift over temperature is mandatory and bandwidth <10kHz suffices. |
| TLC27L1CP | Single CMOS op amp; 0.5pA typical IB, but fixed 100μA IQ, no IOSET pin, and lower CMRR (70dB vs. 76dB min). | Limited flexibility in power/bandwidth trade-off; not qualified for extended temp ranges beyond 0°C–70°C. | Choose TLC27L1CP for cost-sensitive, fixed-performance designs where programmable IQ is unnecessary and VOS ≤ 5mV is acceptable. |
Compared with LTC1050CN8#PBF and TLC27L1CP, the ICL7611DCPA+ uniquely combines pin-selectable IQ, guaranteed 1pA IB across 0°C–70°C, and industry-standard DIP-8 layout compatibility - making it optimal for field-serviceable, battery-powered instrumentation requiring both longevity and configurability.
Availability
ICL7611DCPA+ is available at Aetrix Electronics and suitable for pH meter manufacturing, portable photodiode-based analyzers, picoammeter production, and low-droop sample/hold modules requiring stable component supply across multi-year product 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 industrial, medical, and communications applications.
The ICL7611DCPA+ belongs to the ICL761X–ICL764X family - engineered specifically for ultra-high-impedance, low-power signal conditioning in electrochemical, optical, and leakage-critical measurement systems.
FAQ
What is the maximum supply voltage rating for the ICL7611DCPA+?
The ICL7611DCPA+ has an absolute maximum total supply voltage (V+ to V–) of +18V. It operates over a functional range of ±1V to ±8V for dual supplies or 2V to 16V for single supplies. Exceeding +18V risks permanent damage, and operation above ±8V (dual) or 16V (single) is outside specified performance limits - confirmed in Absolute Maximum Ratings and Electrical Characteristics tables.
How is quiescent current selected on the ICL7611DCPA+?
The ICL7611DCPA+ uses its IOSET pin (Pin 5) for quiescent current selection: connect to V+ for 10μA, leave floating between V–+0.8V and V+–0.8V for 100μA, or connect to V– for 1000μA. This configuration directly sets unity-gain bandwidth (0.044/0.48/1.4MHz) and slew rate (0.016/0.16/1.6V/μs), as verified in Electrical Characteristics tables under ICL76XXD conditions.
Does the ICL7611DCPA+ require external frequency compensation?
No, the ICL7611DCPA+ is internally compensated for stable unity-gain operation - unlike the ICL7614 variant which requires external compensation. This is explicitly stated in the Detailed Description section and confirmed by the absence of COMP/OUT compensation pins in its 8-pin DIP pinout. No external capacitor is needed for standard buffer or inverting amplifier configurations.
What is the input offset voltage specification for the ICL7611DCPA+?
The ICL7611DCPA+ is a "D" grade device, specifying 15mV maximum input offset voltage (VOS) at +25°C and 20mV maximum across 0°C to +70°C - per Electrical Characteristics table for ICL76XXD. This aligns with the ordering code "D" in the package suffix and is distinct from "A" (2mV) or "B" (5mV) variants, confirming its use case in cost-optimized, moderate-precision applications.
Can the ICL7611DCPA+ drive capacitive loads directly?
The ICL7611DCPA+ can drive moderate capacitive loads (≤100pF) without instability when configured as a unity-gain buffer, as validated by pulse response curves in the datasheet. For larger loads (>100pF), a series isolation resistor (10–100Ω) between output and capacitance is recommended to maintain phase margin - consistent with observed overshoot behavior (5–40%) and rise time trends across IQ settings in Typical Operating Characteristics.
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:
- Active
- 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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