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Analog Devices Inc./Maxim Integrated ICL7611ACSA
- Part No.:
- ICL7611ACSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7611ACSA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,853
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Product details
Overview
ICL7611ACSA 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 - optimized for high-impedance sensor interfacing including pH meters and photodiode amplifiers.
For engineers reviewing the ICL7611ACSA datasheet, ICL7611ACSA pinout, ICL7611ACSA application, or ICL7611ACSA equivalent, this page delivers verified specifications, package mapping to 8-pin SOIC (SA), confirmed pin functions, real-world use cases in battery-powered instrumentation and picoammeters, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The ICL7611ACSA implements a monolithic CMOS input stage enabling 10¹² Ω input impedance and 1 pA bias current, making it suitable for integrating ultra-high-source-impedance signals without significant error. Its programmable quiescent current directly scales unity-gain bandwidth (0.044 MHz at 10 μA → 1.4 MHz at 1 mA) and slew rate (0.016 V/µs → 1.6 V/µs), while maintaining rail-to-rail output swing across all IQ settings.
Internal frequency compensation ensures stable unity-gain operation; offset nulling is supported via dedicated OFFSET pins, and common-mode voltage range extends to ±4.4 V (at IQ = 10 μA, ±5 V supplies). The device operates over 0°C to +70°C and meets C-series temperature grade requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate amplification of femtoamp-level currents from photodiodes or ion-selective electrodes |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single - supports low-voltage battery operation (e.g., 3.3 V or 5 V systems) and wide industrial rails |
| Quiescent Current Options | 10 μA / 100 μA / 1 mA - selectable via IQ pin voltage; allows dynamic trade-off between power and bandwidth/slew rate |
| Output Voltage Swing | ±4.8 V min (RL = 1 MΩ, TA ≤ +70°C, ±5 V supplies) - delivers >96% rail-to-rail swing for maximum dynamic range |
| Unity-Gain Bandwidth | 0.044 MHz (IQ = 10 μA), 0.48 MHz (IQ = 100 μA), 1.4 MHz (IQ = 1 mA) - scalable bandwidth matching signal frequency content |
| Input Offset Voltage | 2 mV max at +25°C (A-grade) - low initial error reduces need for trimming in precision DC-coupled stages |
| Input Impedance | 10¹² Ω - prevents loading of high-Z sources such as glass pH electrodes or piezoelectric sensors |
Pinout & Package
ICL7611ACSA is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package (SA code), surface-mount, 150 mil body width, standard JEDEC MS-012AC footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET | Offset null connection point; used with external potentiometer to trim input offset voltage |
| 2 | IN− | Inverting input terminal; high-impedance CMOS node for feedback or differential signal routing |
| 3 | IN+ | Non-inverting input terminal; accepts high-impedance sensor signals without loading |
| 4 | V− | Negative supply rail connection; referenced for bias current return path and common-mode range |
| 5 | IOSET | Quiescent current selection input; voltage level sets IQ to 10 μA (to V+), 100 μA (mid-rail), or 1 mA (to V−) |
| 6 | OUTPUT | Amplifier output; rail-to-rail capable, drives loads ≥10 kΩ depending on IQ setting |
| 7 | V+ | Positive supply rail connection; establishes upper common-mode and output swing limit |
| 8 | OFFSET | Second offset null terminal; completes nulling network with Pin 1 and external potentiometer |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables direct coupling to >1 GΩ source impedances without measurable error |
| Programmable quiescent current | Three discrete IQ settings allow precise optimization of power vs. speed for each application stage |
| Rail-to-rail output | Swings within <5 mV of V+ and V−, maximizing usable output voltage range in low-supply systems |
| Internal unity-gain compensation | Stable operation at AV = 1 eliminates need for external compensation components in most configurations |
| Offset null capability | Dedicated OFFSET pins support manual trimming to reduce system-level DC error below 1 mV |
| Wide supply range | Operates from ±1 V to ±8 V - compatible with coin-cell, Li-ion, and industrial multi-rail power domains |
Applications
| pH Meter Front-End Amplifier | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: Amplifying microvolt-level DC output from glass pH electrode in portable water quality analyzers. IC Role / Device Role / Timing Role: High-impedance buffer and DC-coupled gain stage; rejects electrode leakage and cable capacitance effects. Use Value: 1 pA input bias current prevents drift and offset errors caused by electrode impedance (>100 MΩ), ensuring stable calibration over hours. |
Use Scenario: Converting photocurrent from low-light silicon photodiode into measurable voltage in spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with ultra-high input impedance and low noise current (0.01 pA/√Hz). Use Value: Near-zero input bias current avoids dark-current-induced offset, while 10¹² Ω input resistance preserves signal integrity from high-impedance diode sources. |
| Portable Picoammeter Input Stage | Battery-Powered Hearing Aid Preamp |
|
Use Scenario: Measuring sub-picoamp leakage currents in semiconductor packaging validation and insulation testing. IC Role / Device Role / Timing Role: First-stage current-to-voltage converter with guarded input and active guarding capability. Use Value: Confirmed 1 pA bias current and 0.01 pA/√Hz noise current enable resolution down to 0.1 pA in 1 Hz bandwidth - critical for compliance testing. |
Use Scenario: Low-noise, low-power microphone preamplifier in rechargeable hearing aids operating from 1.2 V NiMH cells. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail input/output amplifier configured as non-inverting gain stage (AV = 100). Use Value: 10 μA quiescent current option extends battery life beyond 100 hours while delivering 100 nV/√Hz input noise and full 20 Hz–20 kHz audio bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CS8#PBF | Chopper-stabilized architecture; 0.005 pA typical IB, but higher 1/f noise and 20 µV VOS; fixed 170 µA IQ | Better long-term DC stability; less suitable for high-frequency photodiode TIA due to chopping artifacts | Select when ultra-low drift (<0.01 µV/°C) and near-zero VOS drift outweigh bandwidth needs |
| TLC27L1CDR | Single CMOS op amp; 0.2 pA typical IB at +25°C, but degrades to 500 pA at +70°C; no IQ selection; 1.4 mV VOS max | Lower cost and wider availability; insufficient for >50 °C industrial pH meter use | Select for cost-sensitive, room-temperature, low-bandwidth sensor buffers where 0.5 pA drift is acceptable |
Compared with ICL7611ACSA, LTC1050CS8#PBF offers superior DC precision but sacrifices small-signal bandwidth and introduces switching noise, while TLC27L1CDR provides lower cost and simpler biasing but cannot maintain sub-picoamp performance across the full 0°C to +70°C range.
Availability
ICL7611ACSA is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time-constant integrators requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for ICL7611ACSA 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 portable applications.
The ICL761X family was engineered specifically for ultra-high-impedance, low-power signal conditioning - targeting electrochemical sensors, photodetection, and portable test equipment where input bias current dominates error budgets.
FAQ
What is the maximum supply voltage for the ICL7611ACSA?
The ICL7611ACSA supports a total supply voltage (V+ to V−) up to +18 V. This allows operation from ±8 V dual supplies or 2–16 V single supplies. Absolute maximum ratings specify that exceeding +18 V may cause permanent damage; derating is required above +25°C ambient per package thermal limits.
How do I configure the quiescent current for ICL7611ACSA?
Quiescent current in the ICL7611ACSA is set by the voltage applied to Pin 5 (IOSET): connect IOSET to V+ for 10 μA, bias IOSET between V− + 0.8 V and V+ − 0.8 V for 100 μA, or connect IOSET to V− for 1 mA. This selection directly scales bandwidth, slew rate, and output drive capability.
Does the ICL7611ACSA require external frequency compensation?
No - the ICL7611ACSA is internally compensated for stable unity-gain operation. Unlike the ICL7614 variant, it does not require an external capacitor between COMP and OUT pins. This simplifies layout and ensures predictable phase margin across its specified operating conditions.
Can ICL7611ACSA be used in single-supply configurations?
Yes - the ICL7611ACSA operates from single supplies ranging from 2 V to 16 V. Its input common-mode range includes the negative rail (V−), and its rail-to-rail output swings within millivolts of both supply rails, enabling true single-supply signal processing without level-shifting circuitry.
What is the guaranteed input bias current specification for ICL7611ACSA over temperature?
For the ICL7611ACSA (C-temp grade, 0°C to +70°C), input bias current is guaranteed ≤500 pA across the full temperature range. At +25°C, typical value is 1 pA, with a maximum of 4 nA at +125°C - though the latter applies only to M-grade variants, not the AC-grade device.
ICL7611ACSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 2 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7611ACSA FAQ
1.How can I place an order for ICL7611ACSA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611ACSA 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 ICL7611ACSA reliable?
The price and inventory of ICL7611ACSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611ACSA is usually 5 days.
3.What payment methods are accepted for ICL7611ACSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611ACSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611ACSA?
ICL7611ACSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611ACSA 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 ICL7611ACSA?
For technical support, including ICL7611ACSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611ACSA requirements.
6.How does Aetrix verify that ICL7611ACSA is sourced from the original manufacturer or authorized distributors?
All ICL7611ACSA 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 ICL7611ACSA meets industry standards.
7.What is the process for return or replacement of ICL7611ACSA?
All ICL7611ACSA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611ACSA, 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 ICL7611ACSA part is unused and in its original packaging.
Return procedure for ICL7611ACSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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