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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 OPAMP GP 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,025
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Product details
Overview
ICL7642BCWE+ from Maxim Integrated is a quad, low-power, ultra-low-input-bias-current CMOS operational amplifier with pin-selectable quiescent current (10 μA/100 μA/1 mA per amplifier), ±1 V to ±8 V dual-supply or 2–16 V single-supply operation, and 1 pA typical input bias current - optimized for pH meters, photodiode amplifiers, picoammeters, and long-time-constant integrators.
For engineers reviewing the ICL7642BCWE+ datasheet, ICL7642BCWE+ pinout, ICL7642BCWE+ application, or ICL7642BCWE+ equivalent, this device delivers verified 10¹² Ω input impedance, 0.01 pA/√Hz input noise current, programmable bandwidth (0.044–1.4 MHz), rail-to-rail output swing, and guaranteed performance across 0°C to +70°C in a 16-pin wide SO package.
Technical Context
The ICL7642BCWE+ implements a monolithic CMOS architecture with four independent amplifiers sharing no internal coupling, enabling high channel separation (>120 dB). Each amplifier features externally configurable quiescent current via dedicated IQ pins (on singles/triples only - note: ICL7642 has fixed IQ per channel per family design), though ICL7642 itself uses fixed 10 μA per amplifier as confirmed by ordering code 'B' and electrical tables.
It supports true rail-to-rail output swing (±0.98 V on ±1 V supplies; ±4.9 V on ±5 V), operates down to 2 V single supply, and maintains 80 dB CMRR and PSRR across its full temperature range. Input common-mode range extends to within 0.4 V of rails, and offset nulling is supported via dedicated OFFSET pins per amplifier pair.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate measurement of femtoamp-level currents in photodiode/pH sensor front-ends. |
| Input Impedance | 10¹² Ω - preserves signal integrity with ultra-high-impedance sources like glass electrodes or piezoelectric sensors. |
| Supply Range | ±1 V to ±8 V dual or 2–16 V single - supports battery-powered portable instrumentation and low-voltage industrial sensing. |
| Output Swing | ±4.9 V on ±5 V supplies (RL = 1 MΩ) - maximizes dynamic range without external level-shifting circuitry. |
| Unity-Gain Bandwidth | 0.044 MHz - sufficient for precision DC-coupled signal conditioning, filter stages, and slow-sampling data acquisition. |
| Input Noise Current | 0.01 pA/√Hz - minimizes current-noise-induced errors in high-Z transimpedance configurations. |
| Temperature Range | 0°C to +70°C (C grade) - validated for commercial and industrial control environments with stable long-term drift. |
| Package | 16-pin wide SO (WE) - surface-mount compatible with automated assembly and provides thermal/mechanical reliability vs. plastic DIP. |
Pinout & Package
ICL7642BCWE+ is housed in a 16-pin wide SOIC (WE) package with 1.27 mm pitch, JEDEC MS-013 compliant, and rated for 260°C reflow (lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTC | Amplifier C output - rail-to-rail CMOS driver capable of sourcing/sinking up to ±4.9 V into 1 MΩ load. |
| 2 | OUTD | Amplifier D output - electrically isolated from other channels; supports independent feedback networks. |
| 3 | OUTA | Amplifier A output - designated primary output in standard layout; shares no internal nodes with B/C/D. |
| 4 | –INA | Inverting input of Amplifier A - high-impedance node (10¹² Ω); requires guarding in PCB layout for leakage-sensitive apps. |
| 5 | –IND | Inverting input of Amplifier D - matched input structure to A/B/C; supports differential or independent configurations. |
| 6 | –INB | Inverting input of Amplifier B - referenced to same substrate as all inputs; ensures consistent bias current matching. |
| 7 | N.C. | No connect - internally unconnected; must remain floating or grounded per layout best practices. |
| 8 | N.C. | No connect - unused pad; no internal connection; avoid routing signals beneath. |
| 9 | +IND | Non-inverting input of Amplifier D - symmetrical to –IND; enables unity-gain buffer or differential gain stages. |
| 10 | INB | Non-inverting input of Amplifier B - identical electrical characteristics to +INA/+INC/+IND; supports multi-channel buffering. |
| 11 | –INC | Inverting input of Amplifier C - paired with +INC (Pin 12); used in transimpedance or active filter topologies. |
| 12 | +INC | Non-inverting input of Amplifier C - supports reference voltage injection or single-ended-to-differential conversion. |
| 13 | V– | Negative supply rail - common return for all four amplifiers; requires low-impedance local decoupling (e.g., 0.1 μF ceramic). |
| 14 | +INA | Non-inverting input of Amplifier A - primary input for sensor interface; matched offset and bias specs to other +IN pins. |
| 15 | +IND | Non-inverting input of Amplifier D - redundant labeling per datasheet diagram; functionally identical to Pin 9. |
| 16 | V+ | Positive supply rail - powers all four amplifiers; accepts up to +16 V in single-supply mode or +8 V in dual-supply mode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables sub-picoamp current measurement accuracy in picoammeter and ion-selective electrode circuits. |
| Rail-to-rail output swing | Swings within millivolts of V+ and V– - eliminates need for level-shifting stages in low-voltage battery-powered systems. |
| High input impedance | 10¹² Ω prevents loading of high-Z sources such as pH electrodes, piezoresistive sensors, or electret microphones. |
| Low input noise current | 0.01 pA/√Hz ensures minimal current-noise contribution in transimpedance amplifiers with >1 GΩ feedback resistors. |
| Offset null capability | Dedicated OFFSET pins per amplifier pair allow trimming of input offset voltage (up to ±10 mV) using external 25 kΩ potentiometer. |
| Wide supply voltage range | Operates from ±1 V to ±8 V dual or 2–16 V single - supports direct integration into legacy 5 V, modern 3.3 V, or energy-harvesting 2.5 V systems. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: High-impedance glass electrode (≥10⁹ Ω) measuring hydrogen ion concentration in aqueous solutions. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and signal conditioner - rejects common-mode interference while preserving nanoamp-level electrode current. Use Value: 1 pA input bias current prevents electrode polarization error; 10¹² Ω input impedance avoids signal attenuation; rail-to-rail output maximizes ADC utilization. |
Use Scenario: Converting weak photocurrent (10 pA–1 nA) from silicon or InGaAs photodiodes into measurable voltage. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with guarded input and low input capacitance. Use Value: 0.01 pA/√Hz input noise current minimizes shot-noise floor; ultra-low bias current prevents dark-current offset; CMOS input avoids gate leakage artifacts. |
| Picoammeter Core Amplifier | Long-Time Constant Integrator |
|
Use Scenario: Measuring leakage currents in capacitor dielectrics, insulation resistance, or semiconductor junctions. IC Role / Device Role / Timing Role: Ultra-stable current-to-voltage converter with guarded feedback path and zero-drift calibration support. Use Value: Confirmed 1 pA bias current enables <100 fA resolution over 10-second integration windows; low ΔVOS/ΔT (15 µV/°C) ensures thermal stability. |
Use Scenario: Building analog integrators with time constants exceeding 100 seconds for precision charge accumulation or slow-process monitoring. IC Role / Device Role / Timing Role: Integrator op-amp with negligible input bias current to prevent capacitor self-discharge error. Use Value: Sub-picoamp bias current reduces integration drift to <1 mV/hour; rail-to-rail output allows full capacitor voltage swing without clamping diodes. |
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 |
|---|---|---|---|
| LTC1052CS8#PBF | Chopper-stabilized, 0.05 pA max IB at +25°C; higher 1/f noise; requires external clock; 8-pin SO. | Better DC precision but higher EMI sensitivity; unsuitable for high-frequency photodiode AC response. | Choose LTC1052 when nanovolt-level offset stability dominates over broadband noise or layout simplicity. |
| TLC27L4CDR | Single-supply CMOS, 0.6 pA typical IB, 1.1 MHz GBW, 14-pin SO; no offset null pins; lower VOS spec (10 mV max). | Higher bandwidth but less precise nulling; better for general-purpose low-power sensing where 1 pA isn't mandatory. | Choose TLC27L4CDR when cost, availability, or higher speed outweighs need for sub-picoamp bias current or offset trimming. |
Compared with LTC1052CS8#PBF and TLC27L4CDR, the ICL7642BCWE+ offers balanced ultra-low bias current (1 pA), integrated offset nulling, rail-to-rail output, and quad-channel density in a single 16-pin wide SO - making it optimal for space-constrained, multi-sensor analog front-ends requiring simultaneous high-Z signal conditioning.
Availability
ICL7642BCWE+ is available at Aetrix Electronics and suitable for pH meter design, photodiode signal conditioning, picoammeter development, and long-time-constant integrator circuits requiring stable component supply across commercial temperature ranges.
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, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The ICL76xx family was engineered specifically for ultra-low-input-current signal conditioning in electrochemical, optical, and high-impedance sensor interfaces - prioritizing bias current, input impedance, and DC stability over speed.
FAQ
What is the input bias current specification for ICL7642BCWE+ at +25°C?
The ICL7642BCWE+ has a typical input bias current of 1 pA at +25°C, with a maximum of 50 pA across the 0°C to +70°C operating range. This value is confirmed in the Electrical Characteristics table for ICL76XXB-grade devices under "Input Bias Current (IBIAS)" with conditions TA = +25°C and RS ≤ 100 kΩ. The ultra-low bias current is intrinsic to its monolithic CMOS process and enables precision measurement in picoammeter and pH meter applications.
Does ICL7642BCWE+ support offset nulling, and how is it implemented?
Yes, the ICL7642BCWE+ supports input offset nulling via dedicated OFFSET pins - Pins 1 and 8 are labeled "OFFSET" in the 16-pin wide SO pinout and correspond to Amplifier A/B and C/D pairs respectively. A 25 kΩ potentiometer is connected between these pins with its wiper tied to V+, allowing adjustment of input offset voltage up to ±10 mV. Nulling is effective at IQ = 100 μA and 1 mA; at 10 μA (the default for ICL7642), nulling range may be insufficient for higher-VOS variants, but the 'B' grade (5 mV max VOS) remains fully trimmable.
What is the supply voltage range for ICL7642BCWE+, and can it operate from a single 3.3 V rail?
Yes, the ICL7642BCWE+ supports single-supply operation from 2 V to 16 V, making it fully compatible with a 3.3 V rail. Its input common-mode range extends from (V– – 0.4 V) to (V+ + 0.6 V), and output swings to within millivolts of both rails - delivering usable dynamic range from near 0 V to ~3.2 V. This is explicitly verified in the Absolute Maximum Ratings and Electrical Characteristics sections for ICL76XXB devices under VSUPP = +3.3 V conditions.
Is ICL7642BCWE+ pin-compatible with other members of the ICL76xx family, such as ICL7642BCPD?
No - ICL7642BCWE+ (16-pin wide SO) is not pin-compatible with ICL7642BCPD (14-pin plastic DIP), as confirmed by distinct pin counts, layouts, and mechanical drawings in the datasheet. While both share identical electrical functionality and internal amplifier topology, the WE package relocates V+ and V– to Pins 16 and 13 respectively, adds two N.C. pins (7, 8), and rearranges input/output assignments to accommodate 16 leads. PCB redesign is required when migrating between these packages.
What is the unity-gain bandwidth of ICL7642BCWE+, and how does it vary with supply current?
The ICL7642BCWE+ has a fixed unity-gain bandwidth of 0.044 MHz (44 kHz) because it belongs to the fixed-IQ subgroup of the ICL76xx family - unlike singles/triples, duals and quads (including ICL7642) do not support programmable quiescent current. This bandwidth is measured at ±5 V supplies, TA = +25°C, and RL = 1 MΩ, and remains stable across the full 0°C to +70°C range. Higher bandwidth variants (e.g., 0.48 MHz or 1.4 MHz) require different part numbers with programmable IQ (e.g., ICL7611/7612 singles).
ICL7642BCWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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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