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Analog Devices Inc./Maxim Integrated ICL7611DCSA-T
- Part No.:
- ICL7611DCSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7611DCSA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,260
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Product details
Overview
ICL7611DCSA-T 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-T datasheet, ICL7611DCSA-T pinout, ICL7611DCSA-T application, or ICL7611DCSA-T equivalent, this page delivers verified package mapping (8-pin SOIC), confirmed pin functions, real-world application constraints (e.g., offset nulling limitations at 10 μA IQ), and two validated alternative op amps with documented performance trade-offs in low-leakage signal chains.
Technical Context
The ICL7611DCSA-T implements a monolithic CMOS input stage enabling 10¹² Ω input impedance and 0.01 pA/√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 10 μA, 100 μA, or 1 mA per amplifier - altering unity-gain bandwidth (0.044 MHz → 1.4 MHz) and slew rate (0.016 V/µs → 1.6 V/µs) without changing gain structure.
Internally compensated for stable unity-gain operation, it requires no external capacitor - unlike the externally compensated ICL7614 variant. Offset nulling is supported via dedicated OFFSET pins using a 25 kΩ potentiometer tied to V+, though null range is reduced at the 10 μA IQ setting, especially for higher-VOS grades (D-grade = 15 mV max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables picoampere-level current measurement 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. |
| Output Swing | ±4.8 V into 1 MΩ at ±5 V supplies - delivers >96% rail-to-rail dynamic range for maximum signal fidelity. |
| Unity-Gain Bandwidth | 0.044 MHz at 10 μA IQ - sufficient for DC–44 Hz precision sensing; scales to 1.4 MHz at 1 mA IQ for faster settling. |
| Input Offset Voltage | 15 mV max at +25°C (D-grade) - defines minimum resolvable differential signal in high-gain configurations. |
| Common-Mode Range | −4.0 V to +4.4 V at ±5 V supplies and 10 μA IQ - allows direct interfacing with sensors operating near negative rail. |
| Input Impedance | 10¹² Ω - prevents loading of high-Z sources like glass pH electrodes or piezoelectric transducers. |
Pinout & Package
ICL7611DCSA-T is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package (SA code), surface-mount, 150 mil body width, RoHS-compliant, rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET | Offset null adjustment terminal - connect wiper of 25 kΩ pot to V+ for trimming; limited null range at 10 μA IQ. |
| 2 | IN− | Inverting input - high-impedance CMOS node; guard traces required for <1 pA leakage paths. |
| 3 | IN+ | Non-inverting input - matched to IN− for common-mode rejection; avoid capacitive imbalance. |
| 4 | V− | Negative supply rail - decouple with 0.1 μF ceramic capacitor close to pin for stability at all IQ settings. |
| 5 | IOSET | Quiescent current selection - tie to V+ for 10 μA, float (V−+0.8V to V+−0.8V) for 100 μA, or tie to V− for 1 mA. |
| 6 | OUTPUT | Amplifier output - rail-to-rail swing capability enables full utilization of ADC reference range. |
| 7 | V+ | Positive supply rail - same decoupling requirement as V−; supports asymmetric supplies (e.g., +5 V/−2 V). |
| 8 | OFFSET | Second offset null terminal - connect opposite end of 25 kΩ pot to this pin for balanced nulling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables accurate integration over seconds/minutes in long-time-constant circuits without drift. |
| Programmable quiescent current | Three discrete IQ settings allow precise power-bandwidth trade-off: 10 μA for nanoamp battery life, 1 mA for 1.4 MHz bandwidth. |
| Rail-to-rail output swing | Swings within 20 mV of rails at light loads - maximizes dynamic range when driving 12-bit+ SAR ADCs directly. |
| High input impedance | 10¹² Ω minimizes signal attenuation and phase error in high-Z sensor interfaces (e.g., pH electrodes, electret mics). |
| Internal unity-gain compensation | No external capacitor needed - simplifies layout and eliminates compensation tuning for stable DC-coupled gain ≥1 applications. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Measuring hydrogen ion concentration in aqueous solutions using a glass electrode with >10⁹ Ω source impedance. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage converting high-impedance mV-level electrode potential into low-impedance voltage for ADC digitization. Use Value: 1 pA input bias current prevents electrode polarization and ensures <0.01 pH unit drift over 10-minute measurements. | Use Scenario: Converting weak photocurrent (100 pA–10 nA) from a reverse-biased silicon photodiode into measurable voltage. IC Role / Device Role / Timing Role: Low-noise, low-bias-current transimpedance amplifier with 10¹² Ω effective input resistance. Use Value: 0.01 pA/√Hz input current noise preserves SNR in low-light detection; rail-to-rail output drives ADC without level-shifting. |
| Low-Droop Sample/Hold Amplifier | Picoammeter Input Stage |
Use Scenario: Holding analog sensor outputs for multiplexed ADC sampling with <1 mV/min droop over 100 ms hold time. IC Role / Device Role / Timing Role: Unity-gain buffer isolating the hold capacitor from leakage paths during acquisition and hold phases. Use Value: 1 pA input bias current limits droop to <0.36 mV over 100 ms with 1 nF hold capacitor - meets Class I precision requirements. | Use Scenario: Measuring ultra-low currents (1–1000 pA) from radiation detectors or electrochemical cells. IC Role / Device Role / Timing Role: Primary current-to-voltage converter with guarded input and calibrated feedback resistor. Use Value: Input bias current ≤4 nA at +125°C ensures <0.4% measurement error at 1 nA full scale - traceable to NIST standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-input-bias-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CS8#PBF | Zero-drift auto-zero architecture; 0.5 µV max VOS; 50 pA max IB at +25°C - higher bias current than ICL7611DCSA-T by 50×. | Better DC accuracy but higher noise current (0.2 pA/√Hz); unsuitable for sub-pA photodiode apps where ICL7611DCSA-T's 0.01 pA/√Hz dominates. | Select LTC1050CS8#PBF only when VOS drift <0.05 µV/°C is critical and source impedance <100 MΩ; otherwise prefer ICL7611DCSA-T for true pA-level integrity. |
| TLC27L2CDR | Single-supply CMOS op amp; 0.6 pA typ IB at +25°C; fixed 100 µA IQ; 1.1 MHz GBW - lower bias current than LTC1050 but still 0.6× ICL7611DCSA-T's 1 pA. | Optimized for 3–16 V single supply; lacks dual-supply flexibility and IOSET programmability - limits use in bipolar sensor interfaces. | Choose TLC27L2CDR for cost-sensitive, single-rail battery systems where 0.6 pA IB suffices and programmable IQ is unnecessary. |
Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7611DCSA-T uniquely combines true 1 pA bias current, programmable IQ for adaptive power scaling, and dual-supply support - making it irreplaceable in high-precision, multi-rail, ultra-low-leakage measurement systems.
Availability
ICL7611DCSA-T is available at Aetrix Electronics and suitable for pH meters, photodiode amplifiers, low-droop sample/hold circuits, picoammeters, and long-time-constant integrators requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7611DCSA-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-low-input-current signal conditioning - targeting electrochemical sensors, radiation detection, and high-impedance scientific instrumentation where femtoampere-level leakage is unacceptable.
FAQ
What is the maximum operating temperature range for the ICL7611DCSA-T?
The ICL7611DCSA-T is rated for 0°C to +70°C operation (C temperature grade). It is not qualified for extended ranges like −40°C to +85°C (E grade) or −55°C to +125°C (M grade); those require variants such as ICL7611DESA or ICL7611AMTV.
How do I configure the quiescent current on the ICL7611DCSA-T?
Apply voltage to the IOSET pin (Pin 5): tie to V+ for 10 μA, leave floating between V−+0.8 V and V+−0.8 V for 100 μA, or tie to V− for 1 mA. The ICL7611DCSA-T does not support intermediate or analog-adjusted IQ values - only these three discrete settings.
Can the ICL7611DCSA-T be used with single-supply operation?
Yes - the ICL7611DCSA-T operates from 2 V to 16 V single supply. For optimal common-mode range, bias the IN+ and IN− inputs at mid-supply using precision resistors or reference; output swings to within ~20 mV of both rails under light load.
Does the ICL7611DCSA-T require external frequency compensation?
No - the ICL7611DCSA-T is internally compensated for stable unity-gain operation. Unlike the ICL7614 variant, it has no COMP pin and needs no external capacitor. This simplifies PCB layout and guarantees stability across all IQ settings and supply voltages.
What is the input offset voltage specification for the ICL7611DCSA-T?
The ICL7611DCSA-T is a D-grade device with input offset voltage of 15 mV maximum at +25°C and 20 mV maximum across 0°C to +70°C. This value is fixed by laser trimming during manufacturing and cannot be adjusted beyond the OFFSET pin nulling range, which is limited at 10 μA IQ.
ICL7611DCSA-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:
- 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-T FAQ
1.How can I place an order for ICL7611DCSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611DCSA-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 ICL7611DCSA-T reliable?
The price and inventory of ICL7611DCSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611DCSA-T is usually 5 days.
3.What payment methods are accepted for ICL7611DCSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611DCSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611DCSA-T?
ICL7611DCSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611DCSA-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 ICL7611DCSA-T?
For technical support, including ICL7611DCSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611DCSA-T requirements.
6.How does Aetrix verify that ICL7611DCSA-T is sourced from the original manufacturer or authorized distributors?
All ICL7611DCSA-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 ICL7611DCSA-T meets industry standards.
7.What is the process for return or replacement of ICL7611DCSA-T?
All ICL7611DCSA-T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611DCSA-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 ICL7611DCSA-T part is unused and in its original packaging.
Return procedure for ICL7611DCSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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