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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:212
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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 photodiode transimpedance amplifiers.
For engineers reviewing the ICL7611DCSA+ datasheet, ICL7611DCSA+ pinout, ICL7611DCSA+ application, or ICL7611DCSA+ equivalent, key selection criteria include confirmed 1 pA bias current, programmable IQ configuration, 8-pin SOIC package compatibility, and verified performance in high-impedance sensor signal conditioning under low-power constraints.
Technical Context
The ICL7611DCSA+ implements a monolithic CMOS architecture optimized for ultra-high input impedance (10¹² Ω) and minimal input leakage, enabling stable DC gain in integrators and picoamp-level current measurement. Its pin-selectable quiescent current directly scales unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs) without altering input stage topology.
Input offset nulling is supported via dedicated OFFSET pins with external 25 kΩ potentiometer; compensation is internal (unity-gain stable), eliminating external capacitor requirements except for the ICL7614 variant - not applicable to ICL7611DCSA+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate picoampere-level current sensing in photodiode or ion-selective electrode circuits |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single - supports battery-powered portable instrumentation down to 2 V operation |
| Quiescent Current | Pin-selectable: 10 μA / 100 μA / 1 mA - allows dynamic trade-off between power budget and bandwidth/slew rate |
| Input Impedance | 10¹² Ω - preserves signal integrity when interfacing with >100 MΩ source impedances (e.g., pH electrodes) |
| Output Swing | Within 20 mV of rails at RL = 1 MΩ - maximizes dynamic range in low-voltage, single-supply systems |
| Unity-Gain Bandwidth | 0.044 MHz (at 10 μA), 0.48 MHz (at 100 μA), 1.4 MHz (at 1 mA) - scalable AC response per power mode |
| Input Noise Current | 0.01 pA/√Hz - negligible contribution to total noise in high-Z transimpedance designs |
Pinout & Package
ICL7611DCSA+ is housed in an 8-pin Small Outline (SO) package (SA code), surface-mount compatible, with standard industry pinout matching legacy ICL76xx op-amps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET | Offset null adjustment terminal - connects to wiper of 25 kΩ potentiometer for VOS trimming |
| 2 | IN− | Inverting input - high-impedance node for feedback network connection |
| 3 | IN+ | Non-inverting input - accepts high-Z sensor signals with minimal loading |
| 4 | V− | Negative supply rail - referenced to system ground in single-supply configurations |
| 5 | IOSET | Quiescent current select - tied to V+ (10 μA), mid-rail (100 μA), or V− (1 mA) |
| 6 | OUTPUT | Amplifier output - drives loads up to 1 MΩ with rail-to-rail swing |
| 7 | V+ | Positive supply rail - supplies core analog circuitry and output stage |
| 8 | OFFSET | Second offset null terminal - completes external nulling network with Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical ensures <0.1 mV error from 1 GΩ source impedance at 25°C |
| Programmable quiescent current | Three discrete IQ settings enable precise power/performance tuning without redesign |
| Rail-to-rail output swing | ±4.9 V output at ±5 V supply (1 MΩ load) delivers full-scale signal headroom |
| Internal unity-gain compensation | Stable operation at AV = 1 eliminates need for external compensation components |
| High input impedance | 10¹² Ω minimizes signal attenuation and drift in electrochemical sensor interfaces |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode (≥10⁹ Ω) measuring hydrogen ion activity in aqueous solution. IC Role / Device Role / Timing Role: Precision DC-coupled voltage follower and buffer, rejecting common-mode electrode potential drift. Use Value: 1 pA bias current prevents >1 mV offset error across 1 GΩ electrode impedance, ensuring ±0.01 pH accuracy. | Use Scenario: Converting nanoampere photocurrent from silicon photodiode into measurable voltage. IC Role / Device Role / Timing Role: Low-noise, high-Z transimpedance amplifier with programmable gain bandwidth. Use Value: 0.01 pA/√Hz input noise current avoids degradation of SNR in low-light detection (<100 nA). |
| Picoammeter Input Stage | Low-Droop Sample/Hold Amplifier |
Use Scenario: Measuring leakage currents in capacitor dielectric testing or semiconductor junction characterization. IC Role / Device Role / Timing Role: Ultra-low-leakage current-to-voltage converter with guarded input path. Use Value: Confirmed 1 pA bias current enables reliable sub-picoampere resolution without guard-ring complexity. | Use Scenario: Holding analog sensor outputs during ADC conversion in portable data loggers. IC Role / Device Role / Timing Role: Unity-gain buffer with ultra-low input current to minimize hold capacitor discharge. Use Value: 1 pA bias current limits droop to <1 mV/second on 1 nF hold capacitor - extends hold time >100× vs. bipolar op-amps. |
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, 0.005 pA max IB at +25°C; higher VOS (10 µV typ); requires external clock | Better DC precision but adds switching artifacts; unsuitable for low-noise AC-coupled photodiode amps | Select when ultra-low VOS and drift dominate over noise floor and simplicity |
| TLC27L1CDR | CMOS, 0.2 pA max IB at +25°C; fixed 100 µA IQ; no IOSET pin; lower CMRR (70 dB) | Simpler interface but no quiescent current scaling; limited common-mode rejection in noisy industrial environments | Select for cost-sensitive, fixed-power designs where 0.2 pA IB suffices and layout space is constrained |
Compared with LTC1050CS8#PBF and TLC27L1CDR, the ICL7611DCSA+ uniquely balances programmable power, rail-to-rail output, and 1 pA bias current in an industry-standard 8-pin SO package - making it optimal for battery-powered, high-impedance sensor systems requiring both precision and flexibility.
Availability
ICL7611DCSA+ is available at Aetrix Electronics and suitable for pH meters, photodiode amplifiers, picoammeters, and low-droop sample/hold circuits requiring stable component supply across industrial temperature ranges and long 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 instrumentation applications.
The ICL761X family was engineered specifically for ultra-high-impedance, low-power signal conditioning - targeting electrochemical sensors, scientific instruments, and portable test equipment where input leakage must be minimized.
FAQ
What is the maximum operating temperature range for the ICL7611DCSA+?
The ICL7611DCSA+ is rated for operation from –40°C to +85°C (E-grade temperature range), validated per manufacturer specifications and confirmed in the Electrical Characteristics tables for ICL76XXD variants. This range supports deployment in industrial and automotive cabin environments without derating.
Does the ICL7611DCSA+ require external frequency compensation?
No, the ICL7611DCSA+ is internally compensated for unity-gain stability and does not require external capacitors. Unlike the ICL7614 variant, it has no COMP pin and operates reliably with AV ≥ 1 without added components - simplifying PCB layout and reducing BOM count.
How is quiescent current selected on the ICL7611DCSA+?
Quiescent current on the ICL7611DCSA+ is set by the voltage applied to the IOSET pin (Pin 5): connect to V+ for 10 μA, apply mid-rail voltage (between V− + 0.8 V and V+ − 0.8 V) for 100 μA, or tie to V− for 1 mA. This selection directly scales bandwidth and slew rate while preserving input characteristics.
Can the ICL7611DCSA+ drive a 10 kΩ load effectively?
Yes - at 1 mA quiescent current, the ICL7611DCSA+ delivers ±4.5 V output swing into a 10 kΩ load at +25°C, maintaining linearity and low distortion. Output source/sink capability exceeds ±10 mA, supporting moderate drive requirements without external buffers.
Is input offset voltage adjustable on the ICL7611DCSA+?
Yes, the ICL7611DCSA+ provides dedicated OFFSET pins (Pins 1 and 8) for external nulling using a 25 kΩ potentiometer (wiper to V+). Nulling range is sufficient for all VOS grades (2–15 mV) at 100 μA and 1 mA IQ; at 10 μA IQ, nulling may be limited for higher-VOS variants.
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:
- 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:
- 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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