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Analog Devices Inc./Maxim Integrated ICL7611BCSA+T
- Part No.:
- ICL7611BCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7611BCSA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,561
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Product details
Overview
ICL7611BCSA+T 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 operation (or 2V–16V single supply), and 1pA typical input bias current - ideal for pH meters, photodiode amplifiers, and picoammeters requiring femtoamp-level leakage control.
For engineers reviewing the ICL7611BCSA+T datasheet, ICL7611BCSA+T pinout, ICL7611BCSA+T application, or ICL7611BCSA+T equivalent, key selection criteria include guaranteed 5mV max input offset voltage (B-grade), 8-pin SOIC package with industry-standard pinout, programmable IQ for trade-offs between bandwidth (0.044–1.4 MHz) and power, and validated performance at +70°C ambient.
Technical Context
The ICL7611BCSA+T implements a monolithic CMOS input stage enabling 10¹²Ω input impedance and 0.01pA/√Hz input noise current, directly supporting high-impedance sensor interfaces. Its programmable quiescent current architecture uses an external voltage applied to the IOSET pin to select 10μA, 100μA, or 1mA per amplifier - altering unity-gain bandwidth (0.044/0.48/1.4 MHz) and slew rate (0.016/0.16/1.6 V/µs) without changing gain configuration.
Internally compensated for stable unity-gain operation, it features offset-null terminals (pins 1 & 8) and rail-to-rail output swing (±0.96V on ±1V supplies), with common-mode input range extending to within 0.4V of rails at low IQ - critical for battery-powered instrumentation interfacing to transducers operating near supply limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical (≤400pA over 0°C to +70°C) - enables integration time constants >10⁶ seconds in ultra-low-leakage integrators |
| Input Offset Voltage | 5mV max at +25°C (B-grade) - supports precision DC-coupled amplification without trimming in portable medical sensors |
| Supply Range | ±1V to ±8V dual or 2V–16V single - powers from coin cells (3V) to industrial rails (15V) without level-shifting |
| Unity-Gain Bandwidth | 0.044 MHz (at 10μA IQ) to 1.4 MHz (at 1mA IQ) - selectable bandwidth matches signal frequency while minimizing power |
| Output Swing | ±4.8V into 1MΩ at ±5V supplies - delivers >96% rail-to-rail dynamic range for maximum ADC utilization |
| Input Impedance | 10¹²Ω - preserves signal integrity from high-Z sources like glass pH electrodes and photodiodes |
| Quiescent Current | Pin-selectable: 10μA / 100μA / 1000μA - enables <1μW standby power in always-on environmental monitors |
Pinout & Package
ICL7611BCSA+T is housed in an 8-pin Small Outline (SO) package (SA code), 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant, with exposed pad optional per variant - compatible with standard SOIC-8 reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET (Null) | Connect wiper of 25kΩ pot to V+ for input offset nulling; required for sub-mV DC accuracy in precision measurement |
| 2 | –IN | Inverting input terminal; high-impedance CMOS node sensitive to PCB leakage - guard ring recommended |
| 3 | +IN | Non-inverting input terminal; matched to –IN for common-mode rejection; referenced to system ground or virtual ground |
| 4 | V– | Negative supply rail; must be decoupled locally with 0.1μF ceramic to suppress PSRR degradation above 10kHz |
| 5 | OUTPUT | CMOS push-pull output; sinks up to 4mA (at 1mA IQ), sources independent of IQ - drives ADC inputs directly |
| 6 | V+ | Positive supply rail; accepts 2V–16V single or ±1V–±8V dual; internal regulation enables stable IQ across supply variation |
| 7 | IOSET | Quiescent current control: tie to V+ for 10μA, float for 100μA, tie to V– for 1mA - sets bandwidth/slew/noise trade-off |
| 8 | OFFSET (Null) | Second null terminal; completes 3-terminal offset adjustment network with pin 1 and external potentiometer |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA typical enables femtoamp-level current measurement in picoammeters without guard-driven TIA compensation |
| Programmable quiescent current | Three discrete IQ settings allow dynamic optimization of bandwidth vs. battery life in portable instruments |
| Rail-to-rail output swing | Swings within 20mV of rails at light loads - maximizes dynamic range when driving SAR or sigma-delta ADCs |
| Offset null capability | Dual OFFSET pins support external trimming to ≤0.5mV residual offset - critical for DC-stable pH meter front-ends |
| Wide supply voltage range | Operates from ±1V (2V total) - supports direct connection to Li-ion cells (3.0–4.2V) or two AA batteries (2.4–3.2V) |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode (≥1GΩ) measuring hydrogen ion concentration in aqueous solutions. IC Role / Device Role / Timing Role: First-stage DC-coupled amplifier with ultra-low input bias current to prevent electrode polarization and drift. Use Value: 1pA bias current ensures <0.1mV error from electrode leakage over 10-minute measurements - meeting ASTM D1293 pH accuracy requirements. | Use Scenario: Low-light detection in spectrophotometers using unbiased silicon photodiodes generating ~100fA–10pA photocurrent. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) converting photocurrent to voltage with minimal input current-induced offset. Use Value: 0.01pA/√Hz input noise current and 10¹²Ω input impedance preserve SNR in 1–100Hz bandwidths - enabling sub-nW optical power resolution. |
| Picoammeter Core Amplifier | Low-Droop Sample/Hold Circuit |
Use Scenario: Precision current measurement in semiconductor parameter analyzers and material science test systems. IC Role / Device Role / Timing Role: Input stage of guarded picoammeter with feedback resistor up to 10¹¹Ω and active guarding. Use Value: Guaranteed ≤400pA input bias current over 0°C–+70°C allows calibration stability better than ±0.05% of reading - eliminating daily zeroing in production test. | Use Scenario: Acquisition of slow-varying biosignals (e.g., ECG baseline, temperature ramps) requiring hold times >1 second. IC Role / Device Role / Timing Role: Buffer amplifier driving hold capacitor with ultra-low input bias to minimize droop rate. Use Value: 1pA bias current into 1μF hold capacitor yields droop rate <4μV/s - enabling accurate 10-bit sampling after 10-second hold 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 |
|---|---|---|---|
| LTC1050CS8#PBF | Zero-drift chopper architecture; 0.5μV max VOS; higher 1/f noise; 1.2mA IQ fixed | Better DC accuracy but higher EMI susceptibility; unsuitable for high-frequency photodiode AC coupling | Select for sub-μV offset-critical DC applications where 10μA IQ is acceptable; avoid for >1kHz signal paths |
| TLC27L1CDR | Single-supply only (3–16V); 30pA max IBIAS at +25°C; no IOSET pin; 1.4MHz GBW fixed | Lower cost but 30× higher bias current limits use in >100s integrators or pH electrodes | Select for cost-sensitive battery-powered comparators or non-critical sensor buffers; not suitable for picoammeter or pH front-end roles |
Compared with LTC1050CS8#PBF, ICL7611BCSA+T offers lower power (10μA vs. 1.2mA) and superior high-Z source compatibility, while TLC27L1CDR provides simpler implementation but cannot meet femtoamp leakage requirements of precision electrochemical sensing.
Availability
ICL7611BCSA+T is available at Aetrix Electronics and suitable for pH meter front-ends, photodiode transimpedance amplifiers, and picoammeter core amplifiers requiring stable component supply across long-lifecycle instrumentation programs.
Supply support for ICL7611BCSA+T 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 automotive applications - emphasizing low-power, high-reliability, and signal-chain integrity.
The ICL761X family was engineered specifically for ultra-low-leakage, battery-operated instrumentation - delivering femtoamp input bias, rail-to-rail outputs, and programmable IQ to extend runtime without sacrificing DC precision.
FAQ
What is the guaranteed maximum input bias current for ICL7611BCSA+T over its full operating temperature range?
The ICL7611BCSA+T guarantees ≤400pA input bias current over the 0°C to +70°C operating temperature range (C-temp grade). At +25°C, typical performance is 1pA, with a maximum of 50pA specified - making it suitable for applications demanding femtoamp-level leakage control, such as high-impedance pH electrode interfaces and precision picoammeters where drift must remain below 0.01% per hour.
How does the IOSET pin on ICL7611BCSA+T configure quiescent current, and what are the resulting bandwidth trade-offs?
The IOSET pin (pin 7) of ICL7611BCSA+T selects quiescent current: connect to V+ for 10μA (0.044MHz GBW), leave floating for 100μA (0.48MHz GBW), or connect to V– for 1mA (1.4MHz GBW). This direct hardware control enables real-time optimization of power versus signal bandwidth - for example, switching to 10μA during sensor sleep mode cuts power by 100× while maintaining DC stability in a portable gas analyzer's electrochemical cell interface.
Can ICL7611BCSA+T be used with single-supply configurations, and what is the minimum usable supply voltage?
Yes, ICL7611BCSA+T operates from single supplies as low as 2V (e.g., two alkaline AA cells) up to 16V. Its input common-mode range extends to within 0.4V of V– and V+, and output swings to within 20mV of both rails under light load - enabling true single-supply operation in battery-powered hearing aids and handheld multimeters without level-shifting circuitry or negative charge pumps.
What is the purpose of the dual OFFSET pins (1 and 8) on ICL7611BCSA+T, and how should they be implemented?
The dual OFFSET pins (1 and 8) on ICL7611BCSA+T enable external input offset nulling using a 25kΩ potentiometer: connect the pot's ends to pins 1 and 8, and its wiper to V+. This adjusts the internal differential pair to cancel VOS - critical for achieving <1mV residual offset in DC-coupled pH meter front-ends. Nulling is effective across all IQ settings but may not fully correct >5mV VOS at 10μA IQ due to reduced internal correction range.
Is ICL7611BCSA+T internally compensated, and does it require external frequency compensation components?
Yes, ICL7611BCSA+T is internally compensated for stable unity-gain operation - no external capacitor is required. Unlike the ICL7614 (which requires external compensation), the ICL7611BCSA+T integrates compensation circuitry, simplifying layout and eliminating risk of oscillation in standard inverting/non-inverting configurations. This makes it ideal for space-constrained portable instrumentation where board area and component count must be minimized.
ICL7611BCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7611BCSA+T FAQ
1.How can I place an order for ICL7611BCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611BCSA+T 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+T reliable?
The price and inventory of ICL7611BCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611BCSA+T is usually 5 days.
3.What payment methods are accepted for ICL7611BCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611BCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611BCSA+T?
ICL7611BCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611BCSA+T 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+T?
For technical support, including ICL7611BCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611BCSA+T requirements.
6.How does Aetrix verify that ICL7611BCSA+T is sourced from the original manufacturer or authorized distributors?
All ICL7611BCSA+T 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+T meets industry standards.
7.What is the process for return or replacement of ICL7611BCSA+T?
All ICL7611BCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611BCSA+T, 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+T part is unused and in its original packaging.
Return procedure for ICL7611BCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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