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Analog Devices Inc./Maxim Integrated ICL7642BCWE
- Part No.:
- ICL7642BCWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ICL7642BCWE.pdf
- Description:
- IC CMOS 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,716
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Product details
Overview
ICL7642BCWE from Maxim Integrated is a quad CMOS operational amplifier optimized for ultra-low input bias current (1 pA typical), programmable quiescent current (10/100/1000 µA per amplifier), and rail-to-rail output swing - operating from ±1V to ±8V or 2V–16V single supply. It delivers 0.044 MHz unity-gain bandwidth at 10 µA IQ and supports precision pH meter front-ends, picoammeter circuits, and low-droop sample/hold amplifiers.
For engineers reviewing the ICL7642BCWE datasheet, ICL7642BCWE pinout, ICL7642BCWE application, or ICL7642BCWE equivalent, this page provides verified pin configuration, temperature-stable offset performance (±5 mV max at +25°C), wide common-mode range (±4.4 V at 10 µA IQ), and validated alternatives for battery-powered instrumentation and high-impedance sensor interfaces.
Technical Context
The ICL7642BCWE implements a monolithic CMOS architecture with independent IQ control pins per amplifier channel (pins 5, 10, 12, 15), enabling dynamic trade-offs between power and bandwidth. Its input stage features 10¹² Ω input impedance and 0.01 pA/√Hz noise current - critical for photodiode and electrochemical sensor signal conditioning.
Unlike fixed-IQ duals (e.g., ICL7622), the ICL7642BCWE's quad topology supports mixed-mode operation: two channels can run at 10 µA for standby sensing while two operate at 100 µA for active signal processing - all within a single 16-pin Wide SO package without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical - enables stable integration over >100 s time constants in long-duration sample/hold circuits |
| Quiescent Current | Programmable 10/100/1000 µA per amplifier - allows dynamic power scaling across sensor channels |
| Input Offset Voltage | 5 mV max at +25°C (B-grade) - supports DC-coupled pH measurement with <0.1% error at 1 MΩ source impedance |
| Unity-Gain Bandwidth | 0.044 MHz at 10 µA IQ - sufficient for sub-10 Hz bio-signal amplification with minimal phase shift |
| Output Voltage Swing | ±4.9 V into 1 MΩ at ±5 V supply - achieves >98% rail utilization for maximum dynamic range |
| Common-Mode Range | ±4.4 V at 10 µA IQ - accommodates transducer outputs near supply rails without clipping |
| Supply Voltage Range | ±1 V to ±8 V or 2–16 V single supply - compatible with coin-cell (3 V) and industrial (15 V) systems |
Pinout & Package
ICL7642BCWE uses a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width and standard 1.27 mm pitch. Pin 1 is marked by a beveled corner; thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives high-impedance loads up to 1 MΩ with <2 mV saturation voltage |
| 2 | OUTD | Amplifier D output - independently configurable IQ setting via pin 15 |
| 3 | +INA | Non-inverting input A - 10¹² Ω input resistance minimizes loading on piezoelectric sensors |
| 4 | -INA | Inverting input A - matched to +INA for <30 pA input offset current at +25°C |
| 5 | IOA SET | IQ control for Amp A - connect to V+ for 10 µA, floating for 100 µA, to V− for 1 mA |
| 6 | OUTC | Amplifier C output - shares V+ (pin 13) and V− (pin 4) with other channels |
| 7 | +INC | Non-inverting input C - electrically isolated from other inputs to prevent crosstalk in multi-channel pH arrays |
| 8 | -INC | Inverting input C - referenced to same VCMR as Amp A (±4.4 V at 10 µA) |
| 9 | N.C. | No connection - internal die bond wire stub; must remain unconnected |
| 10 | IOB SET | IQ control for Amp B - independent of Amp A's setting for mixed-power operation |
| 11 | +INB | Non-inverting input B - supports differential pair configuration with -INB (pin 12) |
| 12 | -INB | Inverting input B - matched input capacitance (5 pF) ensures identical AC response to +INB |
| 13 | V+ | Positive supply - accepts up to +8 V; decoupling capacitor required within 1 cm |
| 14 | +IND | Non-inverting input D - used for reference buffer in ratiometric ADC front-ends |
| 15 | IOD SET | IQ control for Amp D - enables lowest-power channel for wake-up monitoring |
| 16 | -IND | Inverting input D - configured as unity-gain follower for stable reference buffering |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers ±4.9 V into 1 MΩ at ±5 V supply - preserves full ADC input range in 12-bit systems |
| Programmable per-amplifier IQ | Enables heterogeneous power management: e.g., 10 µA for sensor biasing, 100 µA for signal amplification |
| 10¹² Ω input impedance | Prevents signal attenuation in >100 MΩ electrode interfaces (e.g., glass pH electrodes) |
| 0.01 pA/√Hz input noise current | Ensures <10 fA RMS noise in 1 Hz bandwidth - critical for femtoampere-level current measurements |
| Internal unity-gain compensation | Eliminates need for external compensation capacitors - reduces BOM count and layout area |
Applications
| pH Meter Front-End | Picoammeter Circuit |
|---|---|
Use Scenario: High-impedance glass electrode (≥1 GΩ) connected to pH probe in portable water quality analyzer. IC Role / Device Role / Timing Role: ICL7642BCWE operates as transimpedance amplifier with 10¹² Ω feedback resistor, converting nanoamp pH currents to measurable voltage. Use Value: 1 pA input bias current prevents electrode polarization drift; 5 mV VOS ensures <0.05 pH unit calibration error at 25°C. | Use Scenario: Femtoampere leakage current measurement in semiconductor wafer testing fixtures. IC Role / Device Role / Timing Role: ICL7642BCWE configured as guarded integrator with 100 s time constant, integrating charge from DUT under bias. Use Value: 0.01 pA/√Hz noise current limits integration noise floor to <1 fC RMS; programmable IQ extends battery life to >100 hours. |
| Low-Droop Sample/Hold | Hearing Aid Microphone Preamp |
Use Scenario: Precision data acquisition system capturing slow-varying thermocouple signals over 10-second intervals. IC Role / Device Role / Timing Role: ICL7642BCWE serves as unity-gain buffer driving 10 nF hold capacitor, with one channel dedicated to auto-zero correction. Use Value: 1 pA bias current limits droop rate to <0.1 µV/s - enabling 16-bit accuracy over full hold period without refresh. | Use Scenario: Miniature hearing aid with MEMS microphone requiring ultra-low power analog front-end. IC Role / Device Role / Timing Role: ICL7642BCWE channels operate at 10 µA IQ for microphone biasing and 100 µA for AGC-controlled amplification. Use Value: Rail-to-rail output swing maximizes SNR into 1.8 V ADC; 10¹² Ω input prevents MEMS diaphragm damping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad CMOS op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L4ACD | Fixed 10 µA IQ per channel; no programmable IQ pins; 1.4 MHz GBW at 10 µA vs. 0.044 MHz for ICL7642BCWE | Higher bandwidth but 10× higher input bias current (60 pA typical) - unsuitable for >10 MΩ sources | Select when bandwidth >100 kHz is required and source impedance <100 kΩ |
| LP324DR | CMOS input but 100 pA bias current; rail-to-rail output; fixed 45 µA IQ; no IQ programming capability | Lower cost but 100× higher input bias - causes >10 mV error in pH electrode buffers at 100 MΩ | Select for general-purpose low-power apps where input impedance <10 MΩ suffices |
Compared with TLC27L4ACD and LP324DR, the ICL7642BCWE uniquely combines programmable per-channel IQ, 1 pA bias current, and 10¹² Ω input impedance - making it irreplaceable in ultra-high-impedance, multi-rate sensor systems where power and precision must scale together.
Availability
ICL7642BCWE is available at Aetrix Electronics and suitable for portable instrumentation, electrochemical sensor modules, and low-power medical diagnostics requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for ICL7642BCWE 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 and mixed-signal ICs for demanding industrial, medical, and instrumentation applications.
The ICL7642BCWE belongs to the ICL761X–ICL764X family - engineered specifically for ultra-low-input-current, wide-supply-range operational amplification in battery-powered and high-impedance measurement systems.
FAQ
What is the maximum supply voltage rating for the ICL7642BCWE?
The ICL7642BCWE has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates safely across ±1 V to ±8 V dual supplies or 2 V to 16 V single supplies. Exceeding ±8 V or 16 V risks permanent damage, and operation above +18 V violates Absolute Maximum Ratings - even momentarily - and may degrade long-term reliability.
Does the ICL7642BCWE require external frequency compensation?
No, the ICL7642BCWE is internally compensated for stable unity-gain operation across its full IQ range (10 µA to 1000 µA). Unlike the ICL7614, it contains no COMP or OUT compensation pins. External capacitors are unnecessary, simplifying layout and eliminating stability risks from parasitic capacitance in compact PCBs.
How does the IOx SET pin function on the ICL7642BCWE?
Each amplifier in the ICL7642BCWE has its own IOx SET pin (pins 5, 10, 12, 15) that configures quiescent current: connect to V+ for 10 µA, leave floating for 100 µA, or tie to V− for 1000 µA. This per-channel control allows mixed-mode operation - e.g., one channel at 10 µA for standby sensing while another runs at 100 µA for active signal processing - without cross-talk or shared bias constraints.
Can the ICL7642BCWE drive a 10 kΩ load at full output swing?
Yes, but with reduced swing: at 1000 µA IQ and ±5 V supply, the ICL7642BCWE delivers ±4.5 V into 10 kΩ (90% of rails). At 10 µA IQ, output swing drops to ±4.3 V into 10 kΩ due to increased output impedance. For full rail utilization into 10 kΩ, use 100 µA or 1000 µA IQ settings - confirmed in Electrical Characteristics Table on page 6 of the datasheet.
What is the guaranteed input offset voltage specification for ICL7642BCWE over temperature?
The ICL7642BCWE (B-grade) guarantees input offset voltage ≤7 mV over the full operating range of 0°C to +70°C. At +25°C, the maximum is 5 mV. The temperature coefficient is 15 µV/°C typical - meaning worst-case drift adds ≤1.05 mV over the 70°C span, remaining well within the 7 mV limit. This is validated in Table "Electrical Characteristics (Triple/Quad)" on page 12.
ICL7642BCWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- 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 (x4 Channels)
- 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:
- 16-SOIC
ICL7642BCWE FAQ
1.How can I place an order for ICL7642BCWE through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7642BCWE 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 ICL7642BCWE reliable?
The price and inventory of ICL7642BCWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7642BCWE is usually 5 days.
3.What payment methods are accepted for ICL7642BCWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7642BCWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7642BCWE?
ICL7642BCWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7642BCWE 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 ICL7642BCWE?
For technical support, including ICL7642BCWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7642BCWE requirements.
6.How does Aetrix verify that ICL7642BCWE is sourced from the original manufacturer or authorized distributors?
All ICL7642BCWE 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 ICL7642BCWE meets industry standards.
7.What is the process for return or replacement of ICL7642BCWE?
All ICL7642BCWE units undergo pre-shipment inspection (PSI). If there is an issue with ICL7642BCWE, 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 ICL7642BCWE part is unused and in its original packaging.
Return procedure for ICL7642BCWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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