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Analog Devices Inc./Maxim Integrated ICL7611BCSA
- Part No.:
- ICL7611BCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7611BCSA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
ICL7611BCSA from Maxim Integrated is a single-channel, ultra-low-input-bias-current CMOS operational amplifier with pin-selectable quiescent current (10 μA/100 μA/1 mA), ±1 V to ±8 V supply range, 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 ICL7611BCSA datasheet, ICL7611BCSA pinout, ICL7611BCSA application, or ICL7611BCSA equivalent, key selection criteria include confirmed 1 pA bias current performance, programmable IQ configuration, 8-pin SOIC package compatibility, and validated operation down to ±1 V supplies in low-leakage sensor signal conditioning.
Technical Context
The ICL7611BCSA implements a monolithic CMOS input stage enabling 10¹² Ω input impedance and 0.01 pA/√Hz input noise current, directly supporting high-impedance transducer interfaces like photodiodes and ion-selective electrodes. Its pin-selectable IQ architecture allows dynamic trade-offs between power (10 μA min) and bandwidth (up to 1.4 MHz at 1 mA).
Offset nulling is supported via dedicated OFFSET pins with 25 kΩ potentiometer connection to V+, while internal unity-gain compensation eliminates external components for stable operation - except for the ICL7614 variant, which is not applicable to this part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate measurement of sub-picoamp leakage currents without signal corruption |
| Supply Voltage Range | ±1 V to ±8 V - supports ultra-low-voltage battery-powered systems and wide-range industrial supplies |
| Quiescent Current | Pin-selectable: 10 μA / 100 μA / 1 mA - allows optimization of power vs. bandwidth (0.044–1.4 MHz GBW) |
| Input Impedance | 10¹² Ω - preserves signal integrity when driving from megohm-level source impedances (e.g., pH electrodes) |
| Output Swing | Within 20 mV of rails at RL = 1 MΩ - maximizes dynamic range in single-supply configurations |
| Input Noise Current | 0.01 pA/√Hz - minimizes current noise contribution in high-Z current-to-voltage conversion |
| Common-Mode Range | −4.0 V to +4.4 V at IQ = 10 μA (±5 V supplies) - accommodates signals near supply rails without clipping |
Pinout & Package
ICL7611BCSA is housed in an 8-pin Small Outline (SO) package (SA code), surface-mount compatible with JEDEC MS-012AC footprint, 3.9 mm × 4.9 mm body, 1.75 mm height, and 1.27 mm lead pitch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET | Connects to wiper of 25 kΩ potentiometer for input offset nulling; referenced to V+ |
| 2 | IN− | Inverting input terminal - high-impedance CMOS node for differential signal reception |
| 3 | IN+ | Non-inverting input terminal - matched to IN− for precision differential amplification |
| 4 | V− | Negative supply rail connection - supports dual or single-supply operation down to −1 V |
| 5 | IOSET | Quiescent current select: tie to V+ (10 μA), float (100 μA), or tie to V− (1 mA) |
| 6 | OUTPUT | CMOS output stage - delivers rail-to-rail swing into ≥1 MΩ loads with <20 mV headroom |
| 7 | V+ | Positive supply rail connection - accepts up to +8 V relative to V− |
| 8 | OFFSET | Second offset null terminal - completes potentiometer connection across both OFFSET pins |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables direct interfacing with >1 GΩ sensor sources without significant error |
| Programmable quiescent current | Three discrete IQ settings allow real-time power-bandwidth tuning without redesign |
| Rail-to-rail output swing | Swings within 20 mV of V+ and V− - preserves full signal amplitude in low-voltage systems |
| Internal unity-gain compensation | Stable operation at AV = 1 without external capacitors - reduces BOM count and layout area |
| Offset null capability | Dedicated OFFSET pins support active trimming of input offset voltage across temperature |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Measuring hydrogen ion concentration in aqueous solutions using glass electrode with >10¹² Ω output impedance. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and amplifier with ultra-low input current to prevent electrode polarization and drift. Use Value: 1 pA bias current ensures <0.1 mV error from electrode leakage, enabling ±0.01 pH resolution over 0–14 pH range. | Use Scenario: Converting weak photocurrents (100 fA–10 nA) from scientific-grade photodiodes into measurable voltage signals. IC Role / Device Role / Timing Role: Low-noise, high-Z transimpedance amplifier with programmable gain and bandwidth. Use Value: 0.01 pA/√Hz input noise current and 10¹² Ω input resistance minimize signal degradation in femtoamp-level detection. |
| Picoammeter Input Stage | Low-Droop Sample/Hold Amplifier |
Use Scenario: High-accuracy current measurement in semiconductor parameter analyzers and material testing equipment. IC Role / Device Role / Timing Role: Primary current-to-voltage converter with guarded input and offset-nulling capability. Use Value: Confirmed 1 pA bias current and 5 mV max VOS ensure sub-picoamp accuracy without calibration drift over time. | Use Scenario: Holding analog sensor outputs (e.g., thermocouple, strain gauge) for ADC digitization in portable data loggers. IC Role / Device Role / Timing Role: Ultra-low-leakage hold amplifier with minimized droop rate during acquisition phase. Use Value: Sub-10 pA input current limits voltage droop to <1 μV/s on 1 nF hold capacitor - extends effective hold time by 10× vs. standard op amps. |
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; 0.1 pA typical IB, but higher 1/f noise and 20 μA supply current minimum | Superior DC precision but unsuitable for low-noise AC-coupled photodiode apps due to chopper ripple | Select when long-term VOS drift <0.01 μV/°C is critical and AC noise is secondary |
| TLC27L1CDR | Single-supply only (3–16 V); 0.6 pA typical IB at +25°C; no IOSET pin - fixed 10 μA IQ | Limited to single-rail systems; lacks programmable IQ and dual-supply flexibility | Choose for cost-sensitive, single-supply battery instruments where IQ flexibility is unnecessary |
Compared with LTC1050CS8#PBF and TLC27L1CDR, the ICL7611BCSA uniquely combines pin-selectable quiescent current, true dual-supply operation down to ±1 V, and guaranteed 1 pA bias current across its C-temp range - making it the only option supporting both ultra-low-power and ultra-high-impedance design requirements simultaneously.
Availability
ICL7611BCSA is available at Aetrix Electronics and suitable for pH meter front-ends, photodiode transimpedance amplifiers, and picoammeter input stages requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for ICL7611BCSA 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 instrumentation applications.
The ICL761X family was engineered specifically for ultra-high-impedance, low-power signal conditioning - targeting applications where input bias current, supply voltage flexibility, and offset stability dominate design constraints.
FAQ
What is the maximum operating supply voltage for the ICL7611BCSA?
The ICL7611BCSA supports a total supply voltage (V+ to V−) of up to +18 V. This means it can operate with dual supplies such as ±8 V (16 V total) or ±9 V (18 V total), or single supplies from 2 V to 16 V. Absolute maximum ratings specify that exceeding +18 V risks permanent damage, and input voltages must stay within (V− − 0.3 V) to (V+ + 0.3 V). The ICL7611BCSA is rated for reliable operation across its full specified range.
How do I configure the quiescent current (IQ) on the ICL7611BCSA?
The ICL7611BCSA uses the IOSET pin (Pin 5) to select quiescent current: connect IOSET to V+ for 10 μA, leave it floating (or tie through ≥1 MΩ resistor) for 100 μA, or connect IOSET to V− for 1 mA. These settings directly scale unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/μs), while output source current remains constant. The ICL7611BCSA datasheet confirms these configurations apply across its 0°C to +70°C operating range.
Does the ICL7611BCSA require external frequency compensation?
No, the ICL7611BCSA is internally compensated for stable unity-gain operation and requires no external compensation capacitor. This is confirmed in the "Frequency Compensation" section of the official datasheet, which states that all ICL7611 series devices - except the ICL7614 - are unity-gain stable. Since the ICL7611BCSA is a standard ICL7611 variant (not ICL7614), it operates reliably with no external components, simplifying layout and reducing bill-of-materials cost.
What is the input offset voltage specification for the ICL7611BCSA?
The ICL7611BCSA has a maximum input offset voltage (VOS) of 5 mV at +25°C and 7 mV over its full 0°C to +70°C operating range. This value corresponds to the "B" grade in the ordering nomenclature (ICL761XBxxx), and is verified in the Electrical Characteristics table under ICL76XXB conditions. The ICL7611BCSA also supports active offset nulling via its dedicated OFFSET pins, allowing reduction of residual VOS in precision applications.
Can the ICL7611BCSA be used in single-supply configurations?
Yes, the ICL7611BCSA 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+ (at IQ = 10 μA), and its rail-to-rail output swings within 20 mV of both supply rails. For example, with V+ = 5 V and V− = 0 V, the ICL7611BCSA accepts inputs from 0.4 V to 4.4 V and delivers outputs from 0.02 V to 4.98 V - making it suitable for single-supply sensor interfaces without level-shifting circuitry.
ICL7611BCSA 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7611BCSA FAQ
1.How can I place an order for ICL7611BCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611BCSA 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 ICL7611BCSA reliable?
The price and inventory of ICL7611BCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611BCSA is usually 5 days.
3.What payment methods are accepted for ICL7611BCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611BCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611BCSA?
ICL7611BCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611BCSA 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 ICL7611BCSA?
For technical support, including ICL7611BCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611BCSA requirements.
6.How does Aetrix verify that ICL7611BCSA is sourced from the original manufacturer or authorized distributors?
All ICL7611BCSA 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 ICL7611BCSA meets industry standards.
7.What is the process for return or replacement of ICL7611BCSA?
All ICL7611BCSA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611BCSA, 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 ICL7611BCSA part is unused and in its original packaging.
Return procedure for ICL7611BCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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