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Analog Devices Inc./Maxim Integrated ICL7611BCPA+
- Part No.:
- ICL7611BCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7611BCPA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,671
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Product details
Overview
ICL7611BCPA+ from Maxim Integrated is a single-channel, ultra-low-input-bias-current CMOS operational amplifier optimized for high-impedance sensor interfaces and precision analog signal conditioning. It delivers 1pA typical input bias current, ±1V to ±8V dual-supply operation (or 2V–16V single supply), programmable quiescent current (10μA/100μA/1mA), and rail-to-rail output swing within millivolts of supply rails - enabling use in pH meters, photodiode amplifiers, and long-time-constant integrators.
For engineers reviewing the ICL7611BCPA+ datasheet, ICL7611BCPA+ pinout, ICL7611BCPA+ application, or ICL7611BCPA+ equivalent, key selection criteria include confirmed 1pA input bias current at +25°C, 5mV max input offset voltage (B-grade), 8-pin PDIP package with industry-standard pinout, and validated performance across 0°C to +70°C temperature range with programmable IQ control.
Technical Context
The ICL7611BCPA+ implements a monolithic CMOS architecture with externally configurable quiescent current via the IOSET pin, enabling trade-offs between power (10μA min) and bandwidth (up to 1.4MHz GBW at 1mA). Its input stage features 10¹²Ω input impedance and 0.01pA/√Hz input noise current - critical for low-leakage transimpedance amplification.
It supports internal unity-gain compensation (no external capacitor required), offers offset null capability via dedicated OFFSET pins, and maintains stable operation with supply voltages as low as ±1V. The device is not pin-compatible with op-amps requiring external compensation (e.g., ICL7614) or extended common-mode range variants (e.g., ICL7612/ICL7616).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical at +25°C - enables accurate measurement of picoamp-level photocurrents without significant error. |
| Input Offset Voltage | 5mV max (B-grade) - ensures minimal DC error in precision DC-coupled amplification stages. |
| Supply Voltage Range | ±1V to ±8V dual or 2V–16V single - supports ultra-low-power battery operation down to 2V total supply. |
| Quiescent Current | Programmable: 10μA / 100μA / 1mA - allows dynamic optimization of power vs. bandwidth (0.044–1.4MHz GBW). |
| Output Swing | Within 20mV of rails (RL = 1MΩ) - maximizes dynamic range in low-voltage systems. |
| Input Impedance | 10¹²Ω - preserves signal integrity when interfacing with high-Z sources like glass pH electrodes. |
| Unity-Gain Bandwidth | 0.044MHz at 10μA IQ - sufficient for sub-10kHz sensor signal conditioning with ultra-low power. |
Pinout & Package
ICL7611BCPA+ is housed in an 8-pin plastic DIP (PDIP) package with industry-standard pinout and pin 7 internally connected to case ground. This through-hole package supports manual prototyping and legacy PCB designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET (pin 1) | Offset null terminal - used with external potentiometer to trim input offset voltage. |
| 2 | IN− | Inverting input - high-impedance node for feedback or differential sensing. |
| 3 | IN+ | Non-inverting input - accepts high-Z sensor signals (e.g., photodiode anode). |
| 4 | V− | Negative supply rail - referenced to system ground in single-supply configurations. |
| 5 | IOSET | Quiescent current select - voltage level sets IQ to 10μA (to V+), 100μA (mid-rail), or 1mA (to V−). |
| 6 | OUTPUT | Amplifier output - rail-to-rail capable, drives loads ≥10kΩ at full IQ settings. |
| 7 | Case Ground | Internally connected to package shell - provides shielding and thermal path; must be grounded. |
| 8 | V+ | Positive supply rail - accepts up to +8V in dual-supply mode or +16V in single-supply mode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA typical enables direct connection to >1GΩ source impedances without measurable error. |
| Programmable quiescent current | Three discrete IQ settings allow real-time power/bandwidth tuning without changing hardware. |
| Rail-to-rail output swing | Swings within 20mV of V+ and V− - maximizes usable output range in low-voltage battery systems. |
| Offset null capability | Dedicated OFFSET pins support active trimming of VOS to <1mV in production calibration. |
| Wide supply range | Operates from ±1V to ±8V - supports coin-cell (3V) and multi-cell battery applications without regulators. |
Applications
| pH Meter Front-End Amplifier | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: Amplifying microvolt-level EMF from glass pH electrode in portable water quality analyzers. IC Role / Device Role / Timing Role: High-impedance buffer and DC-coupled gain stage with minimal input loading. Use Value: 1pA input bias prevents electrode polarization drift; 5mV VOS ensures ±0.1 pH accuracy without frequent recalibration. |
Use Scenario: Converting nanoamp photocurrent from UV/IR photodiodes in gas-sensing modules. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain and ultra-low input leakage. Use Value: 10¹²Ω input impedance avoids signal attenuation; 0.01pA/√Hz noise current preserves SNR in low-light detection. |
| Long-Time-Constant Integrator | Low-Droop Sample/Hold Amplifier |
|
Use Scenario: Building 100-second time-constant integrators for radiation dosimetry or environmental charge accumulation. IC Role / Device Role / Timing Role: Precision integrator core with minimized input bias-induced drift. Use Value: 1pA bias current limits integration error to <1mV/s - enabling stable operation over minutes without reset. |
Use Scenario: Holding analog sensor outputs during ADC conversion in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-leakage hold amplifier with rail-to-rail output for full-scale ADC utilization. Use Value: Sub-10nA hold-mode leakage ensures <0.05% droop over 10ms - meeting 12-bit ADC accuracy requirements. |
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, 0.05pA IB, fixed 1.2mA IQ, no programmable quiescent current. | Better VOS drift and lower noise, but higher power and no IQ scaling - unsuitable for multi-mode battery life optimization. | Select when ultra-low VOS drift (<0.05µV/°C) and chopper stability outweigh power flexibility needs. |
| TLC27L1CP | CMOS, 0.5pA IB, fixed 17µA IQ, 110dB CMRR, no offset null pins. | Lower power than ICL7611BCPA+ at 10μA setting, but lacks programmability and offset trimming - limited calibration capability. | Select for cost-sensitive, fixed-performance designs where offset nulling is unnecessary and supply >3V. |
Compared with LTC1050CN8#PBF and TLC27L1CP, the ICL7611BCPA+ uniquely balances ultra-low bias current (1pA), three-step IQ programmability, and offset null capability - making it optimal for field-calibratable, battery-constrained sensor front-ends requiring both precision and power adaptability.
Availability
ICL7611BCPA+ is available at Aetrix Electronics and suitable for pH meter design, photodiode signal conditioning, and long-time-constant integrator circuits requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7611BCPA+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The ICL761X family was designed specifically for ultra-high-impedance, low-power analog signal acquisition - targeting applications where input leakage, supply voltage flexibility, and long-term DC stability are critical.
FAQ
What is the maximum operating temperature range for the ICL7611BCPA+?
The ICL7611BCPA+ is rated for operation from 0°C to +70°C (C-grade temperature range), as indicated by the "C" in its part number suffix. It is not specified for extended industrial (-40°C to +85°C) or military (-55°C to +125°C) ranges. Derating guidelines apply above +25°C ambient per the datasheet's power dissipation table.
How do I configure the quiescent current (IQ) on the ICL7611BCPA+?
The ICL7611BCPA+ uses the IOSET pin (Pin 5) to set quiescent current: connect Pin 5 to V+ for 10μA, leave it floating or bias it between V− + 0.8V and V+ − 0.8V for 100μA, or connect it to V− for 1mA. This configuration directly scales unity-gain bandwidth and slew rate while preserving rail-to-rail output swing.
Does the ICL7611BCPA+ require external frequency compensation?
No, the ICL7611BCPA+ is internally compensated for stable unity-gain operation and does not require external capacitors. Unlike the ICL7614 variant, it has no COMP pin - simplifying layout and reducing BOM count for standard gain configurations.
Can the ICL7611BCPA+ be used with single-supply operation?
Yes, the ICL7611BCPA+ supports single-supply operation from 2V to 16V. When used this way, V− is tied to ground, V+ receives the positive rail, and the input common-mode range extends to within 0.4V of ground - enabling true single-rail sensor interfacing with appropriate level-shifting.
What is the purpose of the OFFSET pins on the ICL7611BCPA+?
The ICL7611BCPA+ provides dedicated OFFSET pins (Pins 1 and 8) to support external nulling of input offset voltage using a 25kΩ potentiometer. This allows production trimming to reduce VOS below the 5mV B-grade maximum - critical for high-accuracy DC measurement paths where offset drift must be minimized.
ICL7611BCPA+ 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:
- 5 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
ICL7611BCPA+ FAQ
1.How can I place an order for ICL7611BCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611BCPA+ 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 ICL7611BCPA+ reliable?
The price and inventory of ICL7611BCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611BCPA+ is usually 5 days.
3.What payment methods are accepted for ICL7611BCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611BCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611BCPA+?
ICL7611BCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611BCPA+ 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 ICL7611BCPA+?
For technical support, including ICL7611BCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611BCPA+ requirements.
6.How does Aetrix verify that ICL7611BCPA+ is sourced from the original manufacturer or authorized distributors?
All ICL7611BCPA+ 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 ICL7611BCPA+ meets industry standards.
7.What is the process for return or replacement of ICL7611BCPA+?
All ICL7611BCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611BCPA+, 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 ICL7611BCPA+ part is unused and in its original packaging.
Return procedure for ICL7611BCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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