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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:4,229
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Product details
Overview
ICL7611BCSA-T from Maxim Integrated is a single-channel, ultra-low-input-bias-current CMOS operational amplifier with pin-selectable quiescent current (10μA/100μA/1mA), ±1V to ±8V supply range, 1pA typical input bias current, and rail-to-rail output swing within millivolts of supplies-designed for pH meters, photodiode amplifiers, and picoammeters.
For engineers reviewing the ICL7611BCSA-T datasheet, ICL7611BCSA-T pinout, ICL7611BCSA-T application, or ICL7611BCSA-T equivalent, this device delivers verified low-noise current (0.01pA/√Hz), 10¹²Ω input impedance, programmable power-performance trade-offs, and compatibility with high-impedance sensor interfaces requiring long time constants and minimal droop.
Technical Context
The ICL7611BCSA-T implements a monolithic CMOS architecture optimized for ultra-low input leakage, enabling stable operation with source impedances up to teraohms. Its IQ pin allows dynamic selection of quiescent current, directly scaling unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs) while preserving rail-to-rail output swing.
Input offset nulling is supported via dedicated OFFSET pins with external 25kΩ potentiometer; internal compensation ensures stable unity-gain operation without external components-except for the ICL7614 variant, which is not applicable here. The device operates across 0°C to +70°C and uses an 8-pin Small Outline (SO) package with industry-standard pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical at +25°C - enables accurate measurement in picoamp-level current sources like photodiodes and ion-selective electrodes. |
| Supply Voltage Range | ±1V to ±8V (or 2V–16V single supply) - supports battery-powered and low-voltage industrial systems without level-shifting. |
| Quiescent Current | Pin-selectable: 10μA / 100μA / 1000μA - allows dynamic optimization of power vs. bandwidth (e.g., 0.044 MHz @ 10μA, 1.4 MHz @ 1mA). |
| Input Impedance | 10¹²Ω - preserves signal integrity when interfacing with high-Z sensors such as pH electrodes and piezoelectric transducers. |
| Output Swing | Within 20mV of rails (RL = 1MΩ) - maximizes dynamic range in low-supply applications like hearing aids and portable instrumentation. |
| Input Noise Current | 0.01pA/√Hz at 1kHz - minimizes current noise contribution in transimpedance amplifier configurations. |
Pinout & Package
ICL7611BCSA-T is housed in an 8-pin Small Outline (SO) package (SA code), surface-mount, JEDEC MS-012AC compliant, with 1.27mm pitch and exposed pad optional per variant. Pin 7 is internally connected to V–.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | CMOS rail-to-rail output stage capable of sourcing/sinking current into 10kΩ load at 1mA IQ setting. |
| 2 (+IN) | Noninverting Input | Ultra-high-impedance CMOS input node; bias current ≤1pA enables direct connection to high-Z sensors. |
| 3 (–IN) | Inverting Input | Matched to +IN for precision differential operation; supports feedback networks up to 100MΩ without significant error. |
| 4 (V–) | Negative Supply | Reference for internal bias circuitry; pin 7 is internally tied to this node in SA package. |
| 5 (OFFSET) | Offset Null (Pin 5) | Connects to wiper of 25kΩ pot between Pins 5 & 6 for manual VOS trimming; effective across all IQ settings. |
| 6 (OFFSET) | Offset Null (Pin 6) | Second terminal of offset null network; used with Pin 5 and external potentiometer to cancel input offset voltage. |
| 7 (IOSET) | Quiescent Current Control | Voltage level selects IQ: V+ → 10μA, mid-rail → 100μA, V– → 1mA; determines bandwidth, slew rate, and output drive. |
| 8 (V+) | Positive Supply | Accepts up to +8V (dual) or +16V (single); internal regulation ensures stable bias under varying supply conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA typical ensures negligible loading on high-impedance sources like glass pH electrodes and photodiodes. |
| Programmable quiescent current | Three discrete IQ settings allow real-time trade-off between power (10μA) and performance (1mA → 1.4MHz GBW). |
| Rail-to-rail output swing | Swings within 20mV of V+ and V– at 1MΩ load, maximizing usable signal range in low-voltage battery systems. |
| Internal unity-gain compensation | Stable operation at AV = 1 without external capacitors-simplifies layout and reduces BOM count vs. externally compensated variants. |
| Offset null capability | Dedicated OFFSET pins support precise DC calibration in precision measurement circuits where VOS drift must be minimized. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode measuring hydrogen ion activity in aqueous solutions with microvolt-level output. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier conditioning ultra-low-current electrode signal with minimal input loading. Use Value: 1pA input bias current prevents electrode polarization and drift; 10¹²Ω input impedance maintains signal fidelity over minutes-scale measurements. | Use Scenario: Converting nanoampere photocurrent from silicon PIN diode into measurable voltage in spectrophotometry or smoke detection. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with programmable gain and bandwidth for analog front-end signal chain. Use Value: 0.01pA/√Hz input noise current minimizes shot-noise contribution; rail-to-rail output maximizes ADC utilization in 3.3V systems. |
| Picoammeter Core Amplifier | Low-Droop Sample-and-Hold Circuit |
Use Scenario: Measuring leakage currents in semiconductor packaging, capacitor dielectrics, or insulation resistance testing. IC Role / Device Role / Timing Role: Ultra-low-input-current op amp configured as current-to-voltage converter with guarded input path. Use Value: Confirmed 1pA bias current enables sub-picoamp resolution; low VOS drift (<15µV/°C) ensures stable zero-point calibration. | Use Scenario: Holding analog sensor outputs during multiplexed ADC conversion in portable data loggers with multi-hour battery life. IC Role / Device Role / Timing Role: Unity-gain buffer with ultra-low input bias to minimize hold-mode droop rate in capacitor-based S/H stages. Use Value: 1pA bias current limits droop to <1mV/s on 1nF hold capacitor-enabling >10-second hold times without active refresh. |
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 | Chopper-stabilized architecture; 0.005pA max IB, but higher 1/f noise and 1.2MHz GBW; requires external charge-balancing cap. | Better DC precision (VOS < 5µV), but less suitable for wideband photodiode amps due to switching artifacts. | Select for ultra-stable DC gain stages where offset drift dominates; avoid in AC-coupled or high-frequency sensor paths. |
| TLC27L1CDR | Single-supply CMOS op amp; 0.6pA typical IB, but only 100µA fixed IQ, no rail-to-rail output, and narrower supply range (3–16V). | Lower cost and simpler layout, but limited output swing (≥1.5V from rails) reduces dynamic range in low-voltage designs. | Choose for cost-sensitive, non-rail-to-rail applications where 100µA IQ suffices and VOS ≤10mV is acceptable. |
Compared with LTC1050CS8#PBF and TLC27L1CDR, the ICL7611BCSA-T uniquely combines pin-selectable IQ, true rail-to-rail output, and guaranteed 1pA bias current across its full operating temperature range-making it optimal for battery-powered, high-impedance sensor interfaces demanding both flexibility and stability.
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, long-term calibration integrity, and consistent low-leakage performance.
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 communications applications.
The ICL761X family was engineered specifically for ultra-high-impedance, low-power sensor signal conditioning-emphasizing sub-picoamp input bias, programmable quiescent current, and robust operation across extended temperature ranges.
FAQ
What is the maximum supply voltage for the ICL7611BCSA-T?
The ICL7611BCSA-T supports a total supply voltage (V+ to V–) of up to +18V. In dual-supply mode, it operates from ±1V to ±8V; in single-supply mode, from 2V to 16V. Absolute maximum ratings specify that exceeding +18V may cause permanent damage, and operation beyond these limits is not functional or reliable. The ICL7611BCSA-T datasheet confirms this rating applies across all temperature ranges and IQ settings.
How does the IOSET pin control quiescent current in the ICL7611BCSA-T?
The IOSET pin (Pin 7) of the ICL7611BCSA-T sets quiescent current by voltage level: connecting to V+ selects 10μA, biasing between V– + 0.8V and V+ – 0.8V selects 100μA, and connecting to V– selects 1000μA. This direct analog control scales bandwidth, slew rate, and output sink current linearly while leaving source current unchanged. The ICL7611BCSA-T's internal circuitry interprets these states without external resistors or logic.
Can the ICL7611BCSA-T be used in rail-to-rail input configurations?
No-the ICL7611BCSA-T features rail-to-rail *output* swing but not rail-to-rail input common-mode range. Its standard common-mode voltage range is –0.4V to +0.6V relative to supplies (e.g., –0.4V to +5.6V on +6V/0V supply). Extended-range variants like ICL7612 or ICL7616 exist, but the ICL7611BCSA-T does not support inputs near the rails. Designers must ensure input signals remain within the specified VCMR to avoid distortion or phase reversal.
What is the purpose of the two OFFSET pins on the ICL7611BCSA-T?
The two OFFSET pins (Pins 5 and 6) on the ICL7611BCSA-T enable manual input offset voltage nulling using an external 25kΩ potentiometer wired with its wiper to V+. This configuration provides adjustable cancellation of VOS across all IQ settings, though effectiveness at 10μA IQ is reduced for higher-VOS grades (e.g., ICL7611D). The ICL7611BCSA-T's datasheet specifies this method achieves full nulling for B-grade (5mV max VOS) devices at 100μA and 1mA IQ.
Is the ICL7611BCSA-T internally compensated for unity-gain stability?
Yes-the ICL7611BCSA-T is internally compensated and stable at unity-gain (AV = 1) without external components. Unlike the ICL7614 variant (which requires external 39pF compensation), the ICL7611BCSA-T integrates frequency compensation circuitry optimized for broadband stability. This eliminates layout sensitivity and capacitor selection overhead, making it suitable for general-purpose precision amplification where simplicity and reliability are critical.
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:
- 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-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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