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Analog Devices Inc./Maxim Integrated ICL7612DESA+
- Part No.:
- ICL7612DESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7612DESA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,018
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Product details
Overview
ICL7612DESA+ from Maxim Integrated is a single, ultra-low-input-bias-current CMOS operational amplifier with extended common-mode voltage range (–1.1V to +0.6V), programmable quiescent current (10μA/100μA/1mA), and 8-pin SOIC package rated for –40°C to +85°C operation. It delivers 1pA typical input bias current, 0.01pA/√Hz input noise current, and rail-to-rail output swing within millivolts of supply rails - ideal for high-impedance sensor interfaces like pH meters and photodiode amplifiers.
For engineers reviewing the ICL7612DESA+ datasheet, ICL7612DESA+ pinout, ICL7612DESA+ application, or ICL7612DESA+ equivalent, key selection criteria include its extended common-mode input range, temperature-stable low bias current across –40°C to +85°C, selectable IQ for power-bandwidth trade-offs, and compatibility with high-source-impedance transducers requiring minimal loading error.
Technical Context
The ICL7612DESA+ implements a monolithic CMOS input stage enabling 1pA typical input bias current and 10¹²Ω input resistance - critical for integrating ultra-low-leakage signal chains. Its extended common-mode voltage range (–1.1V to +0.6V at IQ = 10μA) supports inputs below the negative rail, unlike standard op amps.
Quiescent current is set via external voltage on the IOSET pin: V+ selects 10μA, mid-supply selects 100μA, and V– selects 1mA - directly scaling unity-gain bandwidth (0.044/0.48/1.4 MHz), slew rate (0.016/0.16/1.6 V/µs), and output sink capability while preserving rail-to-rail output swing and low noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical at +25°C; ≤4000pA max over –40°C to +85°C - enables picoamp-level current measurement without significant error. |
| Common-Mode Range | –1.1V to +0.6V (at IQ = 10μA); extends below negative rail - supports single-supply sensor front-ends with ground-referenced inputs. |
| Output Swing | ±4.7V into 1MΩ load at ±5V supplies - achieves >94% rail-to-rail swing, minimizing headroom loss in low-voltage systems. |
| Unity-Gain Bandwidth | 0.044 MHz (IQ = 10μA), 0.48 MHz (IQ = 100μA), 1.4 MHz (IQ = 1mA) - allows dynamic response tuning per power budget. |
| Input Noise Current | 0.01pA/√Hz at 1kHz - ensures minimal current noise contribution in photodiode or ion-selective electrode amplifiers. |
| Supply Voltage Range | ±1V to ±8V or +2V to +16V single supply - supports battery-powered and industrial wide-range supply designs. |
Pinout & Package
ICL7612DESA+ uses an 8-pin Small Outline (SO) package (SA code), surface-mount, JEDEC MS-012AC compliant, with 1.27mm pitch and 4.9mm × 6.0mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Rail-to-rail CMOS output capable of sourcing/sinking up to ±10mA; swings within ~20mV of supply rails. |
| 2 (–IN) | Inverting Input | High-impedance CMOS node; accepts signals down to –1.1V (below V–) when IQ = 10μA. |
| 3 (+IN) | Non-Inverting Input | High-impedance CMOS node; matched to –IN for precision differential sensing. |
| 4 (V–) | Negative Supply | Reference for internal biasing; IOSET pin referenced to this rail for 1mA setting. |
| 5 (OFFSET) | Offset Null (–) | Connects to one end of 25kΩ potentiometer for input offset trimming; functional at IQ ≥ 100μA. |
| 6 (OFFSET) | Offset Null (+) | Connects to other end of 25kΩ potentiometer; wiper ties to V+ for null adjustment. |
| 7 (IOSET) | Quiescent Current Select | Voltage level sets IQ: V+ → 10μA, mid-supply → 100μA, V– → 1mA - enables dynamic power/performance optimization. |
| 8 (V+) | Positive Supply | Primary supply reference; powers internal CMOS circuitry and defines upper rail for output swing. |
Key Features
| Feature | Design Value |
|---|---|
| Extended Common-Mode Input Range | Supports inputs as low as –1.1V (below V–) at 10μA IQ - enables direct interfacing with grounded electrochemical sensors. |
| Programmable Quiescent Current | Three discrete IQ settings (10μA/100μA/1mA) via single IOSET pin voltage - eliminates need for external current-setting resistors or multiple part numbers. |
| Ultra-Low Input Bias Current | 1pA typical ensures <1mV error from 1GΩ source impedance - essential for long-time-constant integrators and picoammeters. |
| Rail-to-Rail Output Swing | Swings within 20mV of V+ and V– rails at light loads - maximizes dynamic range in low-voltage (e.g., +3.3V) battery-powered systems. |
| Low Input Noise Current | 0.01pA/√Hz minimizes current noise contribution in high-Z photodiode transimpedance amplifiers - preserves SNR at low photocurrent levels. |
Applications
| Electrochemical Sensor Interface | Low-Power pH Meter Front-End |
|---|---|
Use Scenario: Amplifying microvolt-level output from glass pH electrodes with source impedances >100MΩ in portable field instruments. IC Role / Device Role / Timing Role: Precision DC-coupled transimpedance amplifier with extended common-mode range to accommodate electrode offset voltages below ground. Use Value: 1pA input bias current prevents electrode polarization drift; rail-to-rail output preserves full 0–14 pH measurement range at low supply voltage. | Use Scenario: Battery-operated handheld pH meter requiring multi-year operation on coin-cell batteries. IC Role / Device Role / Timing Role: Ultra-low-power signal conditioner for pH probe output, operating at 10μA IQ to extend battery life. Use Value: 10μA quiescent current enables >5-year battery life; programmable IQ allows temporary boost to 1mA during calibration without hardware change. |
| Photodiode Signal Amplification | Picoammeter Input Stage |
Use Scenario: Converting nanoampere photocurrents from UV/IR photodiodes into measurable voltage in spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input current noise (0.01pA/√Hz) and high input impedance (10¹²Ω). Use Value: Minimizes Johnson-Nyquist and current noise contributions - enables detection of sub-picoamp photocurrents at 1kHz bandwidth. | Use Scenario: Measuring leakage currents in semiconductor device characterization or capacitor dielectric testing. IC Role / Device Role / Timing Role: Guarded, low-bias-current amplifier with offset nulling capability for sub-picoamp current integration. Use Value: 1pA bias current and 25kΩ offset trim allow accurate nulling of amplifier offset - critical for integrating femtoampere-level currents over seconds. |
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; 0.1pA max IB, but higher 1/f noise and 1.5MHz GBW; requires external capacitors. | Better DC precision and lower drift, but unsuitable for high-frequency photodiode AC coupling due to chopper ripple. | Select LTC1050CS8#PBF only when ultra-low offset drift (<0.05µV/°C) outweighs bandwidth and noise requirements. |
| TLC27L2CDR | Single-supply CMOS op amp; 0.7pA typical IB, but no extended common-mode range and fixed 100µA IQ; SOIC-8 package. | Lacks below-rail input capability and IQ programmability - limits use in grounded-sensor or multi-power-mode systems. | Choose TLC27L2CDR for cost-sensitive, single-rail-only applications where extended common-mode range is unnecessary. |
Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7612DESA+ uniquely combines programmable IQ, extended common-mode input (–1.1V), and guaranteed 1pA bias current over –40°C to +85°C - making it optimal for battery-powered electrochemical and photodiode systems requiring both low power and rail flexibility.
Availability
ICL7612DESA+ is available at Aetrix Electronics and suitable for electrochemical sensor interfaces, portable pH meters, photodiode amplifiers, and picoammeter designs requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7612DESA+ 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 automotive applications.
The ICL761X family was engineered specifically for ultra-low-input-current signal conditioning in high-impedance, battery-constrained systems - emphasizing bias current stability, rail-to-rail output, and flexible power optimization.
FAQ
What is the maximum allowable supply voltage for the ICL7612DESA+?
The ICL7612DESA+ supports a total supply voltage (V+ to V–) of up to +18V. This means it can operate with dual supplies such as ±8V (16V total) or single supplies up to +16V. Exceeding +18V risks permanent damage, as specified in the Absolute Maximum Ratings table. Operation at ±1V minimum enables ultra-low-power sensor interface designs.
How does the IOSET pin configure quiescent current in the ICL7612DESA+?
The IOSET pin on the ICL7612DESA+ sets quiescent current by voltage level: connecting IOSET to V+ selects 10μA, biasing IOSET to mid-supply (e.g., V+/2) selects 100μA, and connecting IOSET to V– selects 1mA. This direct voltage-based selection avoids external resistors and enables dynamic IQ reconfiguration in firmware-controlled systems using GPIO-driven voltage dividers.
Does the ICL7612DESA+ support input offset nulling, and how is it implemented?
Yes, the ICL7612DESA+ supports input offset nulling via dedicated OFFSET pins (pins 5 and 6). A 25kΩ potentiometer is connected between these pins, with its wiper tied to V+. Nulling is fully effective at IQ = 100μA or 1mA; at 10μA IQ, the nulling range may be insufficient for higher-VOS variants (e.g., ICL7612D), limiting correction to ≤5mV offset.
What is the extended common-mode voltage range specification for the ICL7612DESA+, and why is it significant?
The ICL7612DESA+ offers an extended common-mode voltage range of –1.1V to +0.6V when configured at 10μA IQ. This allows the inverting and non-inverting inputs to accept signals up to 1.1V below the negative supply rail - a critical capability for interfacing grounded electrochemical sensors (e.g., pH electrodes) without level-shifting circuitry, reducing design complexity and error sources.
Is the ICL7612DESA+ internally compensated, and what are the implications for stability?
Yes, the ICL7612DESA+ is internally compensated for unity-gain stability, eliminating the need for external compensation components. This guarantees stable operation with closed-loop gains ≥1 across all IQ settings and supply conditions. Unlike the externally compensated ICL7614, no external capacitor is required - simplifying layout and ensuring robust performance in space-constrained portable instrumentation.
ICL7612DESA+ 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
ICL7612DESA+ FAQ
1.How can I place an order for ICL7612DESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7612DESA+ 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 ICL7612DESA+ reliable?
The price and inventory of ICL7612DESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7612DESA+ is usually 5 days.
3.What payment methods are accepted for ICL7612DESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7612DESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7612DESA+?
ICL7612DESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7612DESA+ 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 ICL7612DESA+?
For technical support, including ICL7612DESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7612DESA+ requirements.
6.How does Aetrix verify that ICL7612DESA+ is sourced from the original manufacturer or authorized distributors?
All ICL7612DESA+ 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 ICL7612DESA+ meets industry standards.
7.What is the process for return or replacement of ICL7612DESA+?
All ICL7612DESA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7612DESA+, 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 ICL7612DESA+ part is unused and in its original packaging.
Return procedure for ICL7612DESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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