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Analog Devices Inc./Maxim Integrated ICL7611DESA+
- Part No.:
- ICL7611DESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7611DESA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,708
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Product details
Overview
ICL7611DESA+ 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 dual-supply operation (or 2–16 V single supply), 1 pA typical input bias current at +25°C, and 8-pin SOIC package rated for –40°C to +85°C. It serves as a precision front-end amplifier in high-impedance sensor interfaces.
For engineers reviewing the ICL7611DESA+ datasheet, ICL7611DESA+ pinout, ICL7611DESA+ application, or ICL7611DESA+ equivalent, this device is selected for low-leakage signal conditioning where input bias current, offset stability over temperature, programmable power vs. bandwidth trade-offs, and rail-to-rail output swing are critical design constraints.
Technical Context
The ICL7611DESA+ implements a monolithic CMOS input stage enabling 1 pA typical input bias current and 10¹² Ω input resistance - essential for pH meters and photodiode transimpedance amplifiers. Its quiescent current is set via the IOSET pin voltage relative to V+ and V−, directly scaling unity-gain bandwidth (0.044 MHz at 10 μA → 1.4 MHz at 1 mA) and slew rate (0.016 V/µs → 1.6 V/µs).
Internally compensated for unity-gain stability, it delivers rail-to-rail output swing (±4.7 V on ±5 V supplies at –40°C to +85°C) and supports offset nulling via external 25 kΩ potentiometer between OFFSET pins. Input common-mode range varies with IQ setting - e.g., ±4.4 V at 10 μA, narrowing to ±3.7 V at 1 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C; enables picoampere-level current measurement without significant error. |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single; supports battery-powered and industrial rails. |
| Quiescent Current Options | 10 μA / 100 μA / 1 mA; selectable via IOSET pin voltage to optimize power-bandwidth trade-off. |
| Input Offset Voltage | 15 mV max at +25°C (D-grade); accommodates moderate DC precision requirements with nulling support. |
| Unity-Gain Bandwidth | 1.4 MHz at 1 mA IQ; sufficient for low-frequency active filters and sample/hold circuits. |
| Output Voltage Swing | ±4.7 V on ±5 V supplies at –40°C to +85°C; delivers >94% of rail-to-rail dynamic range. |
| Input Noise Current | 0.01 pA/√Hz at 1 kHz; minimizes current noise contribution in high-Z source applications. |
Pinout & Package
ICL7611DESA+ uses an 8-pin Small Outline (SO) package (SA code), surface-mount, JEDEC MS-012AC compliant, 3.9 mm × 4.9 mm body, 1.27 mm pitch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET | Offset null connection (pin 1 and 8 used together with external potentiometer) |
| 2 | IN− | Inverting input terminal; high-impedance CMOS node (10¹² Ω) |
| 3 | IN+ | Non-inverting input terminal; matched to IN− for common-mode rejection |
| 4 | V− | Negative supply rail connection; referenced for IOSET and bias network |
| 5 | IOSET | Quiescent current selection input; voltage level sets IQ to 10 μA, 100 μA, or 1 mA |
| 6 | OUTPUT | Amplifier output; CMOS output stage swings within millivolts of V+ and V− rails |
| 7 | V+ | Positive supply rail connection; powers internal bias and output stage |
| 8 | OFFSET | Second offset null terminal; completes nulling circuit with pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables direct interfacing with photodiodes, ion-selective electrodes, and electrometers without guard rings or T-networks. |
| Programmable quiescent current | Three discrete IQ settings allow dynamic optimization of bandwidth, slew rate, and power for battery life vs. performance trade-offs. |
| Rail-to-rail output swing | Output reaches within ~30 mV of V+ and V− rails, maximizing dynamic range in low-voltage systems. |
| Internal unity-gain compensation | Stable operation at AV = 1 eliminates need for external compensation components in most configurations. |
| Offset null capability | Dual OFFSET pins support external trimming to reduce system-level DC error in precision DC-coupled paths. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Measuring hydrogen ion concentration in aqueous solutions using glass electrode with high output impedance (>10⁹ Ω). IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage; rejects common-mode electrode drift while preserving nanoamp-level signal integrity. Use Value: 1 pA input bias current prevents electrode polarization error; 10¹² Ω input resistance avoids loading the reference half-cell. | Use Scenario: Converting weak photocurrent (10 pA–1 nA) from silicon photodiode into measurable voltage under low-light conditions. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with minimal input current error and stable phase margin. Use Value: 0.01 pA/√Hz input noise current and 1 pA bias current maximize signal-to-noise ratio without requiring guard traces or active shielding. |
| Long-Time Constant Integrator | Low-Droop Sample/Hold Amplifier |
Use Scenario: Building analog integrators with time constants exceeding 100 seconds for energy metering or slow-process control. IC Role / Device Role / Timing Role: Integrator core with capacitor feedback; ultra-low IB ensures minimal integration drift over minutes/hours. Use Value: 1 pA bias current limits droop to <1 mV/s on a 1 µF capacitor - enabling accurate long-duration integration without periodic reset. | Use Scenario: Capturing and holding analog sensor outputs (e.g., thermocouple, strain gauge) for ADC conversion in portable data loggers. IC Role / Device Role / Timing Role: High-impedance hold amplifier with minimal charge leakage during acquisition and hold phases. Use Value: Sub-picoampere input leakage preserves held voltage accuracy for >1 second - critical for 16-bit+ resolution systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision low-bias-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L1CDR | Fixed 10 µA IQ; 2 pA typical IB; no IOSET pin; 5 mV max VOS (B-grade) | Lacks programmable IQ and offset null pins; lower VOS but higher IB than ICL7611DESA+ | Select when fixed ultra-low-power operation suffices and offset trimming is unnecessary. |
| LMP7721MA/NOPB | 4 fA typical IB; 10 MHz GBW; no IOSET; 10-pin SOIC; 125 µA supply current | Orders-of-magnitude lower IB but significantly higher power; no quiescent current selection | Select when femtoampere-level bias current is mandatory and power budget allows >100 µA per channel. |
Compared with TLC27L1CDR and LMP7721MA/NOPB, the ICL7611DESA+ uniquely balances ultra-low IB (1 pA), user-selectable IQ for adaptive bandwidth control, and integrated offset nulling - making it optimal for battery-powered, high-impedance analog front-ends requiring both precision and power flexibility.
Availability
ICL7611DESA+ is available at Aetrix Electronics and suitable for pH meter design, photodiode signal conditioning, long-time constant integration, low-droop sample/hold circuits, and portable instrumentation requiring stable component supply across extended temperature ranges.
Supply support for ICL7611DESA+ 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-input-impedance, low-power analog signal conditioning - targeting applications where input bias current, offset stability, and flexible power scaling dominate design constraints.
FAQ
What is the maximum operating temperature range for the ICL7611DESA+?
The ICL7611DESA+ is rated for operation from –40°C to +85°C (E-grade temperature range), validated per manufacturer specifications and supported by electrical characteristics tables across that full range - including input bias current, output swing, and supply current performance.
How is quiescent current configured on the ICL7611DESA+?
The ICL7611DESA+ uses its IOSET pin (pin 5) to select quiescent current: connect IOSET to V+ for 10 μA, bias IOSET between V− + 0.8 V and V+ − 0.8 V for 100 μA, or connect IOSET to V− for 1 mA. This configuration directly scales bandwidth, slew rate, and output drive capability.
Does the ICL7611DESA+ require external frequency compensation?
No - the ICL7611DESA+ is internally compensated for stable unity-gain operation. Unlike the ICL7614 variant, it does not require an external capacitor between COMP and OUT pins, simplifying layout and reducing BOM count in standard gain configurations.
Can the ICL7611DESA+ be used with single-supply operation?
Yes - the ICL7611DESA+ supports single-supply operation from 2 V to 16 V. Its input common-mode range and rail-to-rail output swing allow full utilization of the supply range, provided input signals remain within (V− − 0.3 V) to (V+ + 0.3 V) per absolute maximum ratings.
What is the purpose of the two OFFSET pins on the ICL7611DESA+?
The ICL7611DESA+ provides dedicated OFFSET pins (pins 1 and 8) to support external offset nulling: a 25 kΩ potentiometer is connected between them, with its wiper tied to V+, allowing adjustment of input offset voltage - particularly valuable for DC-critical applications like precision integrators or sensor front-ends.
ICL7611DESA+ 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7611DESA+ FAQ
1.How can I place an order for ICL7611DESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7611DESA+ 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 ICL7611DESA+ reliable?
The price and inventory of ICL7611DESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7611DESA+ is usually 5 days.
3.What payment methods are accepted for ICL7611DESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7611DESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7611DESA+?
ICL7611DESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7611DESA+ 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 ICL7611DESA+?
For technical support, including ICL7611DESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7611DESA+ requirements.
6.How does Aetrix verify that ICL7611DESA+ is sourced from the original manufacturer or authorized distributors?
All ICL7611DESA+ 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 ICL7611DESA+ meets industry standards.
7.What is the process for return or replacement of ICL7611DESA+?
All ICL7611DESA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7611DESA+, 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 ICL7611DESA+ part is unused and in its original packaging.
Return procedure for ICL7611DESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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