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Analog Devices Inc./Maxim Integrated ICL7612BESA+
- Part No.:
- ICL7612BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7612BESA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,409
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Product details
Overview
ICL7612BESA+ 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), 5 mV max input offset voltage, and extended common-mode voltage range (±5.3 V at 10 μA IQ). It serves as a precision front-end amplifier in pH meters, photodiode interfaces, and low-leakage sample/hold circuits.
For engineers reviewing the ICL7612BESA+ datasheet, ICL7612BESA+ pinout, ICL7612BESA+ application, or ICL7612BESA+ equivalent, key selection criteria include its 1 pA typical input bias current, programmable power-performance tradeoff via IQ pin, -40°C to +85°C industrial temperature rating, and compatibility with high-impedance sensor sources requiring sub-picoampere leakage control.
Technical Context
The ICL7612BESA+ implements a monolithic CMOS input stage enabling 1 pA typical input bias current and 10¹² Ω input resistance - critical for guarding against signal corruption in ultra-high-impedance applications. Its extended common-mode voltage range (–1.1 V to +0.6 V relative to supplies) supports rail-to-rail input operation beyond standard op-amps.
Quiescent current is set externally via the IOSET pin: connection to V+ selects 10 μA (0.044 MHz GBW), mid-rail selects 100 μA (0.48 MHz), and connection to V– selects 1 mA (1.4 MHz). Output swing reaches within millivolts of both rails under light loads, and internal unity-gain compensation eliminates need for external components except in specialized high-speed configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical - enables stable integration and picoammeter use with >100 GΩ source impedances |
| Input Offset Voltage | 5 mV max at +25°C - supports precision DC-coupled amplification without trimming in many sensor interfaces |
| Supply Range | ±1 V to ±8 V dual or 2–16 V single - allows direct battery operation (e.g., 3.3 V or 9 V) without regulation |
| Unity-Gain Bandwidth | 0.044 MHz (at 10 μA IQ) - sufficient for <50 Hz instrumentation, ECG, and slow-scan spectroscopy |
| Common-Mode Range | –1.1 V to +0.6 V (extended) - accepts inputs below negative rail, ideal for transducer bridges and grounded-source sensors |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin environments |
| Package | 8-pin SOIC (SA code) - surface-mount compatible with automated assembly and moderate thermal dissipation (250 mW) |
Pinout & Package
ICL7612BESA+ uses an 8-pin Small Outline (SO) package (SA code), JEDEC MS-012AC compliant, with 1.27 mm pitch and gull-wing leads. Thermal resistance θJA ≈ 160°C/W.
| 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 CMOS node; guard ring recommended for leakage-sensitive layouts |
| 3 | +IN | Non-inverting input - matched to –IN for optimal CMRR; requires symmetric PCB routing |
| 4 | V– | Negative supply - must be decoupled locally with 0.1 μF ceramic capacitor |
| 5 | OUTPUT | CMOS output stage - rail-to-rail swing capability; limited sink current at low IQ |
| 6 | V+ | Positive supply - same decoupling requirement as V–; powers internal bias networks |
| 7 | IOSET | Quiescent current select - logic-level referenced: V+ = 10 μA, mid-rail = 100 μA, V– = 1 mA |
| 8 | OFFSET | Second offset null terminal - completes nulling circuit with Pin 1 and external potentiometer |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables accurate measurement of femtoampere-level photocurrents and electrochemical signals |
| Programmable quiescent current | Three discrete IQ settings allow dynamic tradeoff between power (10 μA) and bandwidth (1.4 MHz at 1 mA) |
| Extended common-mode input range | Accepts inputs down to –1.1 V below V–, supporting single-supply transducer interfaces with grounded outputs |
| Internal unity-gain compensation | Eliminates need for external compensation capacitor - simplifies layout and reduces BOM count |
| High input impedance | 10¹² Ω minimizes loading error on high-Z sources like glass pH electrodes and piezoelectric sensors |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode (≥1 GΩ) measuring hydrogen ion concentration in aqueous solutions. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and amplifier with ultra-low input bias to prevent electrode polarization and drift. Use Value: 1 pA bias current ensures <0.1 mV error across 1 GΩ source, preserving pH resolution better than 0.01 unit over hours. | Use Scenario: Converting weak photocurrent (10 pA–1 nA) from silicon PIN diodes into measurable voltage in spectrophotometers. IC Role / Device Role / Timing Role: Low-noise, low-bias transimpedance amplifier with programmable gain bandwidth. Use Value: 0.01 pA/√Hz current noise and 10¹² Ω input resistance maximize SNR for sub-nanoampere signals without active guarding. |
| Low-Droop Sample/Hold Circuit | Picoammeter Input Stage |
Use Scenario: Capturing and holding analog sensor outputs (e.g., thermocouple, strain gauge) for ADC digitization with minimal settling error. IC Role / Device Role / Timing Role: Unity-gain follower driving hold capacitor; low IB prevents charge leakage during hold phase. Use Value: 1 pA bias current limits droop to <1 mV/s on 1 nF capacitor - extends hold time beyond 10 seconds with <10 mV error. | Use Scenario: Measuring leakage currents in semiconductor device testing, capacitor dielectric absorption, or insulation resistance. IC Role / Device Role / Timing Role: Primary current-to-voltage converter with guarded input and calibrated feedback resistor. Use Value: Guaranteed ≤4 nA max input bias at +125°C ensures measurement accuracy down to 10 pA without correction algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CS8#PBF | Chopper-stabilized architecture; 0.01 µV/°C VOS drift vs. 15 µV/°C for ICL7612BESA+; higher supply current (170 µA) | Better DC precision but introduces 100 kHz switching artifacts; unsuitable for sensitive analog front-ends near RF bands | Select when ultra-low offset drift dominates over noise and EMI concerns |
| TLC27L2CDR | Fixed 10 µA IQ; no programmable current; lower VOS (2 mV max); narrower supply (3–16 V single only) | Limited flexibility in power/performance tuning; lacks extended common-mode range (only –0.4 V to +0.6 V) | Select for cost-sensitive, fixed-power designs where extended input range is not required |
Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7612BESA+ uniquely combines programmable IQ, extended common-mode input, and true 1 pA bias performance - making it optimal for battery-powered, high-impedance sensor systems demanding configurable precision.
Availability
ICL7612BESA+ is available at Aetrix Electronics and suitable for pH meter manufacturing, photodiode-based analytical instruments, low-leakage test equipment, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for ICL7612BESA+ 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, photodetectors, and long-time-constant integrators where conventional op-amps introduce unacceptable error.
FAQ
What is the maximum supply voltage for the ICL7612BESA+?
The ICL7612BESA+ supports a total supply voltage (V+ to V–) up to +18 V. This allows operation from ±1 V to ±8 V dual supplies or 2–16 V single supplies. Exceeding +18 V risks permanent damage per Absolute Maximum Ratings. Derating applies above +25°C ambient: 2 mW/°C for the 8-pin SO package.
How does the IOSET pin configure quiescent current in the ICL7612BESA+?
The IOSET pin (Pin 7) sets quiescent current in the ICL7612BESA+: connect to V+ for 10 μA, apply a voltage between V– + 0.8 V and V+ – 0.8 V for 100 μA, or connect to V– for 1 mA. This selection directly scales unity-gain bandwidth (0.044/0.48/1.4 MHz) and slew rate (0.016/0.16/1.6 V/μs), enabling application-specific power-performance optimization.
Does the ICL7612BESA+ require external frequency compensation?
No, the ICL7612BESA+ is internally compensated for stable unity-gain operation. Unlike the ICL7614 variant, it has no COMP pin and needs no external capacitor. This simplifies design and improves reliability in space-constrained or high-reliability applications where component count must be minimized.
What is the guaranteed input bias current specification for ICL7612BESA+ over temperature?
The ICL7612BESA+ guarantees input bias current ≤4 nA maximum at +125°C (E-temp grade). At +25°C, typical is 1 pA with max 50 pA. This tight upper bound ensures predictable leakage error in long-duration measurements - critical for picoammeters and integrating capacitors used in energy-harvesting or battery-monitoring systems.
Can the ICL7612BESA+ drive a 10 kΩ load while maintaining rail-to-rail output swing?
Yes - at 1 mA quiescent current, the ICL7612BESA+ delivers ±4.5 V output swing into 10 kΩ with ±5 V supplies (±4.0 V at –40°C to +85°C). At lower IQ settings, output swing degrades: ±4.9 V into 1 MΩ at 10 μA, but only ±4.5 V into 100 kΩ at 100 μA. Load matching to selected IQ is essential for full dynamic range utilization.
ICL7612BESA+ 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7612BESA+ FAQ
1.How can I place an order for ICL7612BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7612BESA+ 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 ICL7612BESA+ reliable?
The price and inventory of ICL7612BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7612BESA+ is usually 5 days.
3.What payment methods are accepted for ICL7612BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7612BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7612BESA+?
ICL7612BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7612BESA+ 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 ICL7612BESA+?
For technical support, including ICL7612BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7612BESA+ requirements.
6.How does Aetrix verify that ICL7612BESA+ is sourced from the original manufacturer or authorized distributors?
All ICL7612BESA+ 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 ICL7612BESA+ meets industry standards.
7.What is the process for return or replacement of ICL7612BESA+?
All ICL7612BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7612BESA+, 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 ICL7612BESA+ part is unused and in its original packaging.
Return procedure for ICL7612BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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