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Analog Devices Inc./Maxim Integrated ICL7611DCSA
- Part No.:
- ICL7611DCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7611DCSA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,449
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Product details
Overview
ICL7611DCSA 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 ICL7611DCSA datasheet, ICL7611DCSA pinout, ICL7611DCSA application, or ICL7611DCSA equivalent, this page delivers verified electrical specifications, SO-8 package layout, low-leakage design context, and validated alternative op-amps for battery-powered instrumentation and high-impedance sensor signal conditioning.
Technical Context
The ICL7611DCSA implements a monolithic CMOS input stage enabling 1 pA typical input bias current and 1012 Ω input resistance, critical for minimizing error in high-source-impedance applications like photodiode and electrochemical sensor amplification. 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-swing output capability across all IQ settings.
Input offset voltage is specified at 15 mV (max) over 0°C to +70°C for the 'D' grade, with temperature coefficient up to 25 µV/°C; offset nulling is supported via dedicated OFFSET pins but limited in effectiveness at the 10 μA IQ setting for higher VOS variants. The device is internally compensated for stable unity-gain operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate measurement of sub-picoamp currents without significant input error. |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single - supports ultra-low-voltage battery operation (e.g., 2×AA) and wide industrial rails. |
| Quiescent Current | Pin-selectable: 10 μA / 100 μA / 1 mA - allows dynamic trade-off between power and bandwidth in portable systems. |
| Input Offset Voltage | 15 mV max (0°C to +70°C) - defines minimum resolvable DC signal without trimming; 'D' grade reflects highest VOS tolerance. |
| Unity-Gain Bandwidth | 1.4 MHz at 1 mA IQ - sufficient for low-frequency active filters and sample/hold circuits up to ~100 kHz. |
| Output Voltage Swing | ±4.8 V min into 1 MΩ at ±5 V supplies - delivers >96% rail-to-rail dynamic range for maximum signal fidelity. |
| Input Noise Current | 0.01 pA/√Hz - ensures minimal current noise contribution when amplifying high-Z transducer outputs. |
Pinout & Package
ICL7611DCSA is housed in an 8-pin Small Outline (SO) package (SA code), surface-mount, RoHS-compliant, with standard industry pinout compatible with legacy DIP layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +IN | Non-inverting input - high-impedance CMOS node; leakage <1 pA enables direct connection to pH electrodes or photodiodes. |
| 2 | −IN | Inverting input - matched to +IN for optimal common-mode rejection; used in transimpedance or differential configurations. |
| 3 | V− | Negative supply rail - accepts −1 V to −8 V; must be decoupled locally to suppress supply noise coupling. |
| 4 | OFFSET | Offset null terminal - connects to wiper of 25 kΩ potentiometer (other ends to V+ and V−) for manual VOS trimming. |
| 5 | OFFSET | Offset null terminal - second terminal for balanced nulling network; required for full-range adjustment. |
| 6 | OUTPUT | Amplifier output - CMOS push-pull stage swings within ~20 mV of V+ and V− rails under light load. |
| 7 | IOSET | Quiescent current select - connect to V+ (10 μA), float (100 μA), or V− (1 mA) to configure power/performance mode. |
| 8 | V+ | Positive supply rail - accepts +1 V to +8 V; decoupling capacitor mandatory for stability at higher IQ settings. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables integration time constants >1000 s in precision integrators without drift. |
| Programmable quiescent current | Three discrete IQ settings allow real-time optimization of bandwidth vs. battery life in field-deployed sensors. |
| Rail-to-rail output swing | Swings within 20 mV of V+ and V− rails at ±5 V supplies - maximizes dynamic range for low-voltage data acquisition. |
| High input impedance | 1012 Ω input resistance prevents loading of high-Z sources such as glass pH electrodes or piezoelectric sensors. |
| Internal unity-gain compensation | Stable operation at gain = 1 without external components - simplifies PCB layout and reduces BOM count. |
Applications
| pH Meter Front-End | Low-Droop Sample/Hold |
|---|---|
|
Use Scenario: Amplifying microamp-level currents from glass pH electrodes in portable water quality analyzers. IC Role / Device Role / Timing Role: High-impedance buffer and transimpedance amplifier with ultra-low input leakage. Use Value: 1 pA input bias current prevents electrode polarization and measurement drift over multi-minute sampling intervals. |
Use Scenario: Holding analog sensor outputs during ADC conversion cycles in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Unity-gain follower with low droop rate (<1 µV/s at 1 µF hold capacitor). Use Value: 1012 Ω input resistance minimizes charge leakage, preserving held voltage accuracy for >10 s. |
| Picoammeter Input Stage | Hearing Aid Microphone Preamp |
|
Use Scenario: Measuring femtoamp-to-picoamp currents in semiconductor leakage testing and radiation detection. IC Role / Device Role / Timing Role: Primary current-to-voltage converter with guarded input and offset trimming. Use Value: 0.01 pA/√Hz input noise current ensures resolution down to 10 fA in 1 Hz bandwidth. |
Use Scenario: Low-noise, low-power preamplification of electret microphone signals in hearing aids. IC Role / Device Role / Timing Role: First-stage gain block operating from coin-cell supply (1.5 V) with 10 μA IQ mode. Use Value: 10 μA quiescent current extends battery life to >1 week while delivering >60 dB SNR at 1 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-input-bias-current op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L1CDR | Fixed 10 μA IQ; 20 mV max VOS; no IOSET pin; same SO-8 package. | Lacks programmable IQ - less flexible for multi-mode systems requiring bandwidth scaling. | Choose when fixed ultra-low-power operation suffices and VOS budget allows 20 mV. |
| LMP7721MA/NOPB | 7 fA typical IB; 0.25 mV max VOS; 17 MHz GBW; SO-8; higher supply current (1.3 mA). | Superior precision and speed, but consumes >100× more power - unsuitable for micropower designs. | Choose only when sub-femtoamp bias and <1 mV offset are mandatory, and power is secondary. |
Compared with TLC27L1CDR and LMP7721MA/NOPB, the ICL7611DCSA uniquely balances programmable power, 1 pA bias, and SO-8 compatibility - making it the only option supporting adaptive bandwidth in space-constrained, battery-operated instrumentation where both leakage and power are co-critical.
Availability
ICL7611DCSA is available at Aetrix Electronics and suitable for pH meters, picoammeters, long-time-constant integrators, and hearing aid preamplifiers requiring stable component supply across extended production lifecycles.
Supply support for ICL7611DCSA 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 ICL7611DCSA belongs to the ICL761X–ICL764X family - engineered specifically for ultra-low-leakage, micropower signal conditioning in electrochemical, biomedical, and battery-powered instrumentation.
FAQ
What is the maximum supply voltage rating for the ICL7611DCSA?
The ICL7611DCSA has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates across a wide range: ±1 V to ±8 V dual supply or 2 V to 16 V single supply. Exceeding ±8 V on either rail risks violating the input voltage range (V− − 0.3 V to V+ + 0.3 V) and may cause permanent damage. Always observe derating curves for power dissipation above +25°C ambient.
How do I configure the quiescent current (IQ) on the ICL7611DCSA?
The ICL7611DCSA's IOSET pin (Pin 7) sets quiescent current: connect to V+ for 10 μA, leave floating (or tie to mid-supply via resistor divider) for 100 μA, or connect to V− for 1 mA. This selection directly scales unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs). Ensure IOSET is firmly biased - floating states outside the defined thresholds may yield unstable IQ.
Does the ICL7611DCSA support offset nulling, and how is it implemented?
Yes, the ICL7611DCSA provides two dedicated OFFSET pins (Pins 4 and 5) for manual input offset nulling using a 25 kΩ potentiometer (wiper to V+, ends to V+ and V−). Nulling range is adequate for all VOS grades at 100 μA and 1 mA IQ, but may be insufficient at 10 μA IQ for the 15 mV 'D' grade variant due to reduced internal bias headroom.
Is the ICL7611DCSA internally compensated, and can it be used at unity gain?
Yes, the ICL7611DCSA is internally compensated and fully stable at unity gain (AV = +1) without external components. Unlike the ICL7614 (which requires external compensation), the ICL7611DCSA uses on-chip capacitance to ensure phase margin >45° across all IQ settings and load conditions up to 100 pF - simplifying design for follower and gain-of-one configurations.
What is the input common-mode voltage range for the ICL7611DCSA at ±5 V supplies and 10 μA IQ?
At ±5 V supplies and 10 μA IQ, the ICL7611DCSA's input common-mode voltage range is −4.0 V to +4.4 V - i.e., from 0.6 V below V− to 0.4 V below V+. This exceeds rail-to-rail input capability but supports most single-ended sensor interfaces. Note that the extended VCMR feature applies only to ICL7612/ICL7616 variants, not the ICL7611DCSA.
ICL7611DCSA 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7611DCSA FAQ
1.How can I place an order for ICL7611DCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611DCSA 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 ICL7611DCSA reliable?
The price and inventory of ICL7611DCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611DCSA is usually 5 days.
3.What payment methods are accepted for ICL7611DCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611DCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611DCSA?
ICL7611DCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611DCSA 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 ICL7611DCSA?
For technical support, including ICL7611DCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611DCSA requirements.
6.How does Aetrix verify that ICL7611DCSA is sourced from the original manufacturer or authorized distributors?
All ICL7611DCSA 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 ICL7611DCSA meets industry standards.
7.What is the process for return or replacement of ICL7611DCSA?
All ICL7611DCSA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611DCSA, 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 ICL7611DCSA part is unused and in its original packaging.
Return procedure for ICL7611DCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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