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Analog Devices Inc./Maxim Integrated ICL7641ECWE
- Part No.:
- ICL7641ECWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ICL7641ECWE.pdf
- Description:
- IC CMOS 4 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,597
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Product details
Overview
ICL7641ECWE from Maxim Integrated is a quad CMOS operational amplifier optimized for ultra-low input bias current (1 pA typical), programmable quiescent current (10 μA / 100 μA / 1 mA per amplifier), and rail-to-rail output swing - operating from ±1 V to ±8 V or single 2 V–16 V supplies. It serves as a precision signal conditioner in high-impedance sensor interfaces, including pH meters and photodiode amplifiers.
For engineers reviewing the ICL7641ECWE datasheet, ICL7641ECWE pinout, ICL7641ECWE application, or ICL7641ECWE equivalent, key selection criteria include its 1 pA input bias current, 16-pin wide SO package, -40°C to +85°C temperature range, and configurable IQ pin for power-performance tradeoffs in battery-powered instrumentation.
Technical Context
The ICL7641ECWE implements a monolithic CMOS architecture with four independent amplifiers sharing no internal compensation network - each amplifier features an externally accessible IQ pin enabling dynamic quiescent current selection, directly scaling unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs) without altering output source capability.
Its input stage uses guarded, isolated p-channel MOSFETs to achieve 10¹² Ω input resistance and 0.01 pA/√Hz input noise current, while output stages swing within millivolts of supply rails under 1 MΩ loads - making it suitable for low-leakage integrators and long-time-constant sample/hold circuits where offset drift and bias-induced error dominate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables stable DC coupling into >1 GΩ source impedances without significant error voltage. |
| Supply Voltage Range | ±1 V to ±8 V or 2 V to 16 V single supply - supports operation from coin-cell batteries up to industrial rails. |
| Output Swing | ±4.9 V (vs. ±5 V rails) at 1 MΩ load - delivers >98% rail utilization for maximum dynamic range in low-voltage systems. |
| Unity-Gain Bandwidth | 0.044 MHz (IQ = 10 μA) to 1.4 MHz (IQ = 1 mA) - allows bandwidth tuning per channel to match signal frequency and power budget. |
| Input Noise Current | 0.01 pA/√Hz - minimizes current-noise contribution in transimpedance amplifiers with photodiodes or ion-selective electrodes. |
| Common-Mode Range | -4.0 V to +4.4 V (at IQ = 10 μA, ±5 V supply) - supports inputs near negative rail, critical for single-supply sensor front-ends. |
| Quiescent Current | Programmable per amplifier: 10 μA / 100 μA / 1 mA - enables per-channel optimization of speed vs. battery life in multi-function instruments. |
Pinout & Package
ICL7641ECWE is housed in a 16-pin Wide SO (Small Outline) package with 0.3" body width and standard 0.050" lead pitch. The package is RoHS-compliant, surface-mountable, and rated for -40°C to +85°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTC | Amplifier C output - rail-to-rail CMOS output capable of sourcing/sinking current independent of IQ setting. |
| 2 | OUTD | Amplifier D output - identical electrical behavior to Pin 1; no internal crosstalk due to 120 dB channel separation. |
| 3 | +INA | Amplifier A non-inverting input - high-impedance p-channel gate node; guard ring reduces leakage paths. |
| 4 | +IND | Amplifier D non-inverting input - electrically isolated from other inputs; supports independent reference connections. |
| 5 | -INB | Amplifier B inverting input - matched to +INB (Pin 12); used with external feedback for precision gain configuration. |
| 6 | +INC | Amplifier C non-inverting input - shares same process characteristics as all inputs; VOS matching across channels ≤ 3 mV. |
| 7 | INB | Amplifier B inverting input - note: labeled "INB" but functions identically to -INB; confirmed by pin configuration diagram on page 10. |
| 8 | -INC | Amplifier C inverting input - paired with +INC (Pin 6); supports differential input configurations with matched offset. |
| 9 | +INB | Amplifier B non-inverting input - dedicated high-impedance node; no internal connection to other pins. |
| 10 | V- | Negative supply rail - common return for all four amplifiers; must be decoupled locally with 0.1 µF ceramic capacitor. |
| 11 | V+ | Positive supply rail - powers all amplifiers; accepts up to +16 V (single) or +8 V (dual supply). |
| 12 | OUTA | Amplifier A output - first channel output; compatible with capacitive loads up to 100 pF without instability. |
| 13 | OUTB | Amplifier B output - independently buffered; slew rate scales with IQ but output drive strength remains constant. |
| 14 | -INA | Amplifier A inverting input - matched pair with +INA (Pin 3); used for inverting amplifier topologies requiring low VOS drift. |
| 15 | -IND | Amplifier D inverting input - fully isolated; supports independent feedback networks per channel. |
| 16 | N.C. | No connect - internally unconnected; must remain floating or tied to ground only if required by PCB layout rules. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical ensures <1 µV error across 1 GΩ source impedance - essential for picoammeter and electrochemical sensor front-ends. |
| Programmable quiescent current | Per-amplifier IQ pin allows real-time adjustment of bandwidth and slew rate without changing PCB layout or component count. |
| Rail-to-rail output swing | Swings within 20 mV of supply rails at light loads - maximizes usable signal range in low-voltage, single-supply applications. |
| High input impedance | 10¹² Ω input resistance prevents loading of high-Z sources like glass pH electrodes or piezoelectric sensors. |
| Low input noise current | 0.01 pA/√Hz dominates performance in transimpedance configurations - outperforms bipolar op-amps by >30 dB in current-noise-limited designs. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Measuring hydrogen ion concentration in aqueous solutions using a glass electrode with >10¹⁰ Ω output impedance. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and offset-compensated amplifier conditioning microamp-level electrode currents. Use Value: 1 pA input bias current prevents electrode polarization and drift; 10¹² Ω input resistance avoids signal attenuation. | Use Scenario: Converting weak photocurrents (100 fA–1 nA) from silicon photodiodes into measurable voltage signals. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with programmable bandwidth to match optical pulse duration. Use Value: 0.01 pA/√Hz input noise current minimizes shot-noise floor; rail-to-rail output preserves dynamic range for low-light detection. |
| Long-Time Constant Integrator | Low-Droop Sample/Hold Amplifier |
Use Scenario: Building analog integrators with time constants exceeding 100 seconds for precision charge accumulation in scientific instrumentation. IC Role / Device Role / Timing Role: Integrator core with ultra-low input bias current to minimize integration error over extended periods. Use Value: 1 pA bias current limits integration error to <0.36 µC after 100 s - enabling sub-mV/h drift performance. | Use Scenario: Capturing and holding slow-varying biosensor outputs (e.g., glucose monitors) for ADC conversion without droop. IC Role / Device Role / Timing Role: High-input-impedance unity-gain follower with minimal leakage during hold phase. Use Value: Input bias current <1 pA reduces droop rate to <1 µV/s at 1 µF hold capacitance - extending hold time beyond 10 minutes. |
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 |
|---|---|---|---|
| TLC27L4CD | Fixed 100 µA IQ per amplifier; no programmable quiescent current; 10¹³ Ω input resistance; 1.5 mV max VOS. | Lacks per-channel IQ control - less flexible for mixed-speed multi-channel systems; better VOS spec but higher bias current (20 pA). | Select when fixed low-power operation suffices and tighter initial offset is prioritized over ultra-low leakage. |
| LP324DR | Bipolar input; 20 nA bias current; 36 V supply max; no rail-to-rail output; 100 kHz GBW. | Unsuitable for high-impedance sources due to 20,000× higher input bias; limited to medium-speed, medium-precision general-purpose use. | Select only for cost-sensitive, non-critical applications where input impedance >100 MΩ is not required. |
Compared with TLC27L4CD and LP324DR, the ICL7641ECWE uniquely combines programmable per-amplifier quiescent current, 1 pA bias current, and rail-to-rail output - making it irreplaceable in ultra-high-impedance, multi-bandwidth sensor signal chains where leakage and dynamic range are design-critical.
Availability
ICL7641ECWE is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time constant integrators requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7641ECWE 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 communications applications.
The ICL761X–ICL764X family was engineered specifically for ultra-low-input-current, low-power precision amplification - targeting electrochemical sensors, portable test equipment, and energy-constrained measurement systems.
FAQ
What is the maximum supply voltage rating for the ICL7641ECWE?
The ICL7641ECWE has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates over a functional range of ±1 V to ±8 V dual supply or 2 V to 16 V single supply. Exceeding +18 V risks permanent damage, and operation above ±8 V or 16 V violates the specified electrical characteristics - always observe derating curves in the datasheet for thermal limits at elevated voltages.
Does the ICL7641ECWE support rail-to-rail input common-mode range?
No, the ICL7641ECWE does not support rail-to-rail input common-mode range. Its specified common-mode voltage range is -4.0 V to +4.4 V (at ±5 V supply, IQ = 10 μA), meaning inputs must stay ≥0.6 V above V− and ≤0.6 V below V+. This limitation is inherent to its p-channel input stage and distinguishes it from true rail-to-rail input op-amps - verify input signal headroom in your schematic.
How is quiescent current configured on the ICL7641ECWE?
The ICL7641ECWE does not support programmable quiescent current per amplifier. Unlike the ICL7611/7631 singles and triples, the ICL7641 quad has fixed quiescent current settings: 10 μA per amplifier for the 'C' grade (e.g., ICL7641CCWE), 100 μA for the 'B' grade (e.g., ICL7641BCWE), and 1 mA for the 'E' grade. The ICL7641ECWE is the 1 mA version - confirmed by ordering information table on page 10 and electrical specs on page 13.
Can the ICL7641ECWE drive capacitive loads without oscillation?
The ICL7641ECWE is unity-gain stable and can safely drive ≤100 pF capacitive loads with 1 MΩ series isolation, as verified in typical pulse response plots (page 19). For larger capacitive loads (e.g., >200 pF), add a 100 Ω–500 Ω isolation resistor in series with the output to maintain phase margin - direct connection to cables or ADC input caps without isolation may cause peaking or ringing.
Is there an offset null capability on the ICL7641ECWE?
No, the ICL7641ECWE does not provide offset null pins. Offset null terminals are only available on the ICL7611, ICL7612, ICL7614, ICL7616, ICL7621, and ICL7622 singles and duals (see pin configuration diagrams on pages 2–3). The ICL7641 and ICL7642 quads omit these pins - their input offset voltage is factory trimmed to 5–20 mV (grade-dependent) and must be compensated externally if required.
ICL7641ECWE 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:
- 20 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
ICL7641ECWE FAQ
1.How can I place an order for ICL7641ECWE through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7641ECWE 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 ICL7641ECWE reliable?
The price and inventory of ICL7641ECWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7641ECWE is usually 5 days.
3.What payment methods are accepted for ICL7641ECWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7641ECWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7641ECWE?
ICL7641ECWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7641ECWE 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 ICL7641ECWE?
For technical support, including ICL7641ECWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7641ECWE requirements.
6.How does Aetrix verify that ICL7641ECWE is sourced from the original manufacturer or authorized distributors?
All ICL7641ECWE 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 ICL7641ECWE meets industry standards.
7.What is the process for return or replacement of ICL7641ECWE?
All ICL7641ECWE units undergo pre-shipment inspection (PSI). If there is an issue with ICL7641ECWE, 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 ICL7641ECWE part is unused and in its original packaging.
Return procedure for ICL7641ECWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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