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Analog Devices Inc./Maxim Integrated ICL7612BCSA+
- Part No.:
- ICL7612BCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7612BCSA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,618
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Product details
Overview
ICL7612BCSA+ 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 supply range, and extended common-mode voltage range (–1.1 V to +0.6 V). It delivers 1 pA typical input bias current, 0.01 pA/√Hz input noise current, and 10¹² Ω input impedance - optimized for pH meters, photodiode amplifiers, and picoammeters.
For engineers reviewing the ICL7612BCSA+ datasheet, ICL7612BCSA+ pinout, ICL7612BCSA+ application, or ICL7612BCSA+ equivalent, this device is selected for ultra-high-impedance sensor interfaces where input leakage, long time constants, and low-frequency precision are critical - especially in battery-powered instrumentation and low-droop sample/hold circuits.
Technical Context
The ICL7612BCSA+ implements a monolithic CMOS architecture with programmable quiescent current via the IOSET pin, enabling trade-offs between power (10 μA min) and performance (1.4 MHz GBW at 1 mA). Its extended common-mode input range (–1.1 V to +0.6 V at IQ = 10 μA) supports rail-to-rail input operation beyond standard CMOS op amps.
It features internal unity-gain compensation, offset null capability via dedicated OFFSET pins, and output swing within millivolts of supply rails. Input bias current remains ≤500 pA over 0°C to +70°C, and large-signal voltage gain exceeds 80 dB across temperature and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical (≤500 pA over 0°C to +70°C) - enables stable integration and femtoamp-level current measurement without significant error. |
| Supply Voltage Range | ±1 V to ±8 V (or 2 V to 16 V single-supply) - supports ultra-low-voltage battery operation and wide industrial supply margins. |
| Common-Mode Input Range | –1.1 V to +0.6 V (at IQ = 10 μA) - extends below negative rail, critical for direct sensor interfacing (e.g., pH electrode outputs). |
| Unity-Gain Bandwidth | 0.044 MHz (IQ = 10 μA), 0.48 MHz (IQ = 100 μA), 1.4 MHz (IQ = 1 mA) - scalable bandwidth for precision vs. speed optimization. |
| Input Impedance | 10¹² Ω - preserves signal integrity in high-Z source applications like photodiode transimpedance stages. |
| Output Voltage Swing | ±4.8 V (min) into 1 MΩ at ±5 V supplies - delivers >96% rail-to-rail swing for maximum dynamic range. |
| Input Noise Current | 0.01 pA/√Hz - minimizes current noise contribution in high-impedance, low-frequency sensor front-ends. |
Pinout & Package
ICL7612BCSA+ is housed in an 8-pin Small Outline (SO) package (SA code), surface-mount, RoHS-compliant, with standard industry pinout compatible with legacy ICL76xx devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | CMOS rail-to-rail output stage capable of sourcing/sinking current independent of IQ setting. |
| 2 - –IN | Inverting input | High-impedance CMOS input; accepts signals down to –1.1 V below V– when IQ = 10 μA. |
| 3 - +IN | Non-inverting input | Matches –IN in impedance and common-mode range; used for reference or sensor signal routing. |
| 4 - V– | Negative supply | Supports operation down to –1 V; pin 7 internally connected to case in TO-99 but not in SA package. |
| 5 - OFFSET | Offset null (pin 1) | Connects to wiper of 25 kΩ potentiometer (ends to V+ and V–) for manual VOS trimming. |
| 6 - OFFSET | Offset null (pin 2) | Paired with pin 5 for external nulling circuit; functional only with VOS ≤ 5 mV at IQ = 10 μA. |
| 7 - IOSET | Quiescent current select | Voltage-controlled: tied to V+ → 10 μA; mid-rail → 100 μA; tied to V– → 1 mA. |
| 8 - V+ | Positive supply | Accepts up to +8 V; total supply voltage (V+ to V–) rated to +18 V absolute max. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typ ensures <1 mV error in 1 GΩ source impedance - essential for picoammeter and integrator accuracy. |
| Programmable quiescent current | Three discrete IQ settings (10/100/1000 μA) allow dynamic power/performance tuning without changing layout or BOM. |
| Extended common-mode input range | –1.1 V to +0.6 V enables direct connection of sensors with negative output offsets (e.g., pH electrodes) without level-shifting. |
| Rail-to-rail output swing | Swings within 20 mV of V+ and V– at light loads - maximizes usable signal range in low-supply systems. |
| Internal unity-gain compensation | Stable at AV = 1 without external components - simplifies design for follower, filter, and buffer applications. |
| Offset null capability | Dedicated OFFSET pins support manual trimming of input offset voltage (up to 5 mV) for DC-critical measurement paths. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: High-impedance glass electrode (≥1 GΩ) outputs mV-level DC potential proportional to solution pH. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with ultra-low input bias current to avoid loading the electrode and drifting baseline. Use Value: 1 pA bias current limits voltage error to <1 mV at 1 GΩ source, enabling ±0.01 pH resolution without active guarding. |
Use Scenario: Reverse-biased photodiode generates sub-picoamp photocurrent under low-light conditions. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage while minimizing input current noise and offset drift. Use Value: 0.01 pA/√Hz noise current and 10¹² Ω input resistance preserve SNR in low-light detection, supporting femtoamp sensitivity. |
| Picoammeter Input Stage | Low-Droop Sample/Hold Amplifier |
|
Use Scenario: Measuring leakage currents in semiconductor test fixtures or capacitor dielectric testing. IC Role / Device Role / Timing Role: First-stage current-to-voltage converter with guarded input and calibrated feedback resistor. Use Value: Input bias current ≤500 pA over 0°C to +70°C ensures <0.5% error in 100 pA measurements using 10 MΩ feedback. |
Use Scenario: Holding analog sensor output during ADC conversion in portable medical or environmental monitors. IC Role / Device Role / Timing Role: Unity-gain buffer with ultra-low input bias to minimize hold-mode droop rate. Use Value: 1 pA bias current into 1 μF hold capacitor yields droop rate <1 μV/s - enabling >10 s hold times with <10 μV error. |
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, 1.2 MHz GBW, fixed 1.2 mA IQ, no IOSET or offset null pins. | Better DC precision (0.5 μV VOS, 0.005 pA IB), but higher power and no programmability; requires external filtering for chopper noise. | Select when ultra-low VOS drift and sub-picoamp IB are mandatory, and 1.2 mA supply is acceptable. |
| TLC27L2CDR | Single-supply CMOS, 0.6 pA typ IB, 1.7 V to 16 V operation, no extended CMMR, no IOSET, fixed ~20 μA IQ. | Lower cost, smaller footprint (SOIC-8), but lacks rail-extending inputs and programmable IQ - limited to standard CMR applications. | Select for cost-sensitive, single-supply, moderate-precision designs where extended CMMR and IQ scaling are unnecessary. |
Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7612BCSA+ uniquely balances ultra-low IB (1 pA), programmable IQ (10–1000 μA), extended CMMR (–1.1 V), and offset nulling - making it optimal for battery-powered, high-Z sensor systems requiring both flexibility and precision.
Availability
ICL7612BCSA+ is available at Aetrix Electronics and suitable for pH meter front-ends, photodiode amplifiers, and picoammeter input stages requiring stable component supply, long-lifecycle support, and traceable sourcing for medical, environmental, and test equipment programs.
Supply support for ICL7612BCSA+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The ICL761X family was designed specifically for ultra-low-input-current, low-power precision amplification in high-impedance sensor interfaces - targeting applications where traditional bipolar or JFET op amps fail due to leakage or power constraints.
FAQ
What is the maximum supply voltage rating for the ICL7612BCSA+?
The ICL7612BCSA+ has an absolute maximum total supply voltage (V+ to V–) of +18 V. Operating beyond this risks permanent damage. For reliable operation, use within the recommended range of ±1 V to ±8 V (or 2 V to 16 V single-supply), where all specifications are guaranteed across temperature.
How does the IOSET pin configure quiescent current in the ICL7612BCSA+?
The IOSET pin (pin 7) sets quiescent current: connect to V+ for 10 μA, apply a 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 GBW (0.044–1.4 MHz) and slew rate (0.016–1.6 V/μs) while preserving rail-to-rail output swing.
Does the ICL7612BCSA+ support offset nulling, and how is it implemented?
Yes - the ICL7612BCSA+ provides dedicated OFFSET pins (pins 5 and 6) for manual nulling. Connect a 25 kΩ potentiometer between them, with the wiper to V+, to trim input offset voltage. Nulling is effective for VOS ≤ 5 mV at IQ = 10 μA; higher VOS grades may require IQ ≥ 100 μA for full range.
What is the extended common-mode voltage range of the ICL7612BCSA+, and why is it important?
The ICL7612BCSA+ offers an extended common-mode input range of –1.1 V to +0.6 V (at IQ = 10 μA), exceeding standard CMOS op amps. This allows direct interface with sensors whose output swings below the negative rail - such as pH electrodes - eliminating level-shifting circuitry and associated errors in the ICL7612BCSA+ signal path.
Is the ICL7612BCSA+ internally compensated, and can it be used in unity-gain configurations?
Yes - the ICL7612BCSA+ is internally compensated and fully stable in unity-gain configurations (AV = 1) without external components. This simplifies implementation in voltage followers, active filters, and buffers. Unlike the ICL7614, it does not require external compensation capacitors, ensuring robust performance across its specified operating conditions.
ICL7612BCSA+ 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:
- 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
ICL7612BCSA+ FAQ
1.How can I place an order for ICL7612BCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7612BCSA+ 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 ICL7612BCSA+ reliable?
The price and inventory of ICL7612BCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7612BCSA+ is usually 5 days.
3.What payment methods are accepted for ICL7612BCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7612BCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7612BCSA+?
ICL7612BCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7612BCSA+ 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 ICL7612BCSA+?
For technical support, including ICL7612BCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7612BCSA+ requirements.
6.How does Aetrix verify that ICL7612BCSA+ is sourced from the original manufacturer or authorized distributors?
All ICL7612BCSA+ 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 ICL7612BCSA+ meets industry standards.
7.What is the process for return or replacement of ICL7612BCSA+?
All ICL7612BCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7612BCSA+, 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 ICL7612BCSA+ part is unused and in its original packaging.
Return procedure for ICL7612BCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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