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Analog Devices Inc./Maxim Integrated ICL7621DCPA+
- Part No.:
- ICL7621DCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7621DCPA+.pdf
- Description:
- IC CMOS 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,258
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Product details
Overview
ICL7621DCPA+ from Maxim Integrated is a dual, low-power, ultra-low-input-bias-current CMOS operational amplifier with pin-selectable quiescent current (10μA/100μA/1mA per amplifier), ±1V to ±8V supply range, and 1pA typical input bias current. It operates across 0°C to +70°C and is housed in an 8-pin plastic DIP package, ideal for precision pH meter front-ends and battery-powered picoammeter circuits.
For engineers reviewing the ICL7621DCPA+ datasheet, ICL7621DCPA+ pinout, ICL7621DCPA+ application, or ICL7621DCPA+ equivalent, key selection criteria include confirmed 1pA input bias current at +25°C, programmable IQ enabling trade-offs between bandwidth (0.044–1.4 MHz) and power, and validated operation down to ±1V supplies with rail-to-rail output swing capability.
Technical Context
The ICL7621DCPA+ implements a monolithic CMOS architecture optimized for ultra-high-impedance signal conditioning, featuring separate offset-null pins per amplifier and fixed internal compensation for unity-gain stability. Its input stage delivers 10¹²Ω input resistance and 0.01pA/√Hz input noise current, enabling direct interfacing with photodiodes and high-Z sensor elements without guard traces or leakage mitigation.
Quiescent current is fixed per device variant: ICL7621 series (including ICL7621DCPA+) uses fixed 10μA per amplifier - distinct from ICL761X singles which support programmable IQ. This fixed low-power mode ensures predictable 0.044MHz GBW and 0.016V/µs slew rate while maintaining ±4.8V output swing into 1MΩ at ±5V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical at +25°C - enables accurate measurement of sub-picoamp currents in electrochemical sensors |
| Supply Voltage Range | ±1V to ±8V - supports single-cell Li-ion (3.0–3.7V) and dual-AA (3.0V) battery operation without regulators |
| Input Resistance | 10¹²Ω - preserves signal integrity when amplifying outputs from glass pH electrodes or piezoresistive bridges |
| Output Voltage Swing | ±4.8V into 1MΩ at ±5V - delivers >96% rail-to-rail dynamic range for maximum ADC utilization |
| Unity-Gain Bandwidth | 0.044MHz - sufficient for DC–44kHz applications like audio preamps and slow-scan oscilloscope front-ends |
| Input Offset Voltage | 15mV max at +25°C - accommodates offset trimming via external 25kΩ potentiometer on OFFSET pins |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade instrumentation and portable medical devices |
Pinout & Package
ICL7621DCPA+ is packaged in an 8-pin plastic DIP (Dual In-line Package) with 0.3-inch width and through-hole mounting. Pin 7 is internally connected to the case ground for EMI shielding in sensitive analog layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives high-impedance loads up to 1MΩ with <5mV saturation voltage |
| 2 | -INA | Inverting input of Amplifier A - accepts differential signals referenced to V- or ground |
| 3 | +INA | Non-inverting input of Amplifier A - high-Z node requiring guard ring layout for leakage control |
| 4 | V- | Negative supply rail - must be decoupled with 0.1μF ceramic capacitor near pin |
| 5 | V+ | Positive supply rail - shared supply for both amplifiers; decoupling critical for PSRR >80dB |
| 6 | +INB | Non-inverting input of Amplifier B - electrically isolated from Amplifier A inputs |
| 7 | -INB | Inverting input of Amplifier B - pin 7 tied to case provides shielded reference for low-noise routing |
| 8 | OUTB | Amplifier B output - independent channel usable for differential output or dual-sensor conditioning |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA typical enables direct connection to pH electrodes and photodiode junctions without signal degradation |
| Fixed 10μA quiescent current | Guarantees consistent 0.044MHz bandwidth and 0.016V/µs slew rate across temperature and unit variance |
| Offset null capability | Dual independent OFFSET pins allow precise trimming of input offset voltage for matched-channel applications |
| Rail-to-rail output swing | ±4.8V into 1MΩ at ±5V supplies maximizes dynamic range for 12-bit+ ADC interfaces |
| Internal unity-gain compensation | Eliminates need for external compensation components - simplifies layout and reduces BOM count |
Applications
| pH Meter Front-End | Portable Picoammeter |
|---|---|
Use Scenario: Measuring millivolt-level Nernst potentials from glass pH electrodes in handheld lab analyzers. IC Role / Device Role / Timing Role: Dual op-amp configured as high-impedance buffer + precision inverting amplifier for electrode signal conditioning. Use Value: 1pA input bias current prevents electrode polarization drift; 10¹²Ω input resistance avoids loading the 100MΩ–1GΩ electrode impedance. | Use Scenario: Detecting femtoamp-to-picoamp leakage currents in semiconductor wafer testing fixtures. IC Role / Device Role / Timing Role: Transimpedance amplifier with guarded input and offset-null calibration for ultra-low-current integration. Use Value: Confirmed 0.01pA/√Hz input noise current ensures <100fA RMS noise floor in 10Hz bandwidth; fixed 10μA IQ minimizes self-heating drift. |
| Battery-Powered Hearing Aid | Low-Droop Sample/Hold Circuit |
Use Scenario: Amplifying microvolt-level microphone signals in Class-D hearing aids powered by zinc-air cells (1.4V). IC Role / Device Role / Timing Role: First-stage preamplifier operating from ±1.4V supplies with rail-to-rail output driving AGC circuitry. Use Value: Validated ±1V minimum supply operation allows direct use of single zinc-air cell; 15mV max VOS enables stable gain without auto-zero circuitry. | Use Scenario: Holding analog sensor outputs for multiplexed ADC sampling in environmental monitoring nodes. IC Role / Device Role / Timing Role: Unity-gain buffer with ultra-low input current to minimize hold-mode droop over 100ms intervals. Use Value: 1pA bias current limits droop to <0.1mV/s on 1nF hold capacitor - extends hold time 100× vs. bipolar op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual ultra-low-bias-current op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CN8#PBF | Chopper-stabilized architecture; 0.005μV/°C VOS drift vs. ICL7621DCPA+'s 25μV/°C; higher 1.2MHz GBW but 50μA supply current | Required where <1μV long-term VOS stability is critical (e.g., precision weigh scales); not suitable for battery life-sensitive designs | Select LTC1050CN8#PBF only when VOS drift dominates error budget and supply current >5× ICL7621DCPA+ is acceptable |
| OPA2182IDR | Zero-drift topology; 4μV max VOS vs. 15mV; 10MHz GBW; 170μA supply current; no offset-null pins | Preferred for high-speed, high-accuracy data acquisition where chopper noise is tolerable and PCB space permits SOIC-8 | Choose OPA2182IDR when system requires <5μV VOS and >1MHz bandwidth; avoid if offset trimming or DIP packaging is mandatory |
Compared with LTC1050CN8#PBF and OPA2182IDR, the ICL7621DCPA+ offers the lowest power (10μA per amp) and DIP packaging for legacy prototyping, while trading off VOS stability and bandwidth - making it optimal for cost-sensitive, battery-constrained, high-impedance sensor interfaces where moderate DC accuracy suffices.
Availability
ICL7621DCPA+ is available at Aetrix Electronics and suitable for pH meter front-ends, portable picoammeters, and battery-powered hearing aids requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7621DCPA+ 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 sensing, power, and interface applications in industrial, medical, and communications systems.
The ICL7621DCPA+ belongs to the ICL761X–ICL764X family of ultra-low-input-bias-current op-amps engineered specifically for high-impedance sensor signal conditioning in battery-operated and precision measurement equipment.
FAQ
What is the input bias current specification for ICL7621DCPA+ at room temperature?
The ICL7621DCPA+ has a typical input bias current of 1pA at +25°C, with a maximum of 400pA across the full 0°C to +70°C operating range. This ultra-low value is achieved via its monolithic CMOS input stage and makes the ICL7621DCPA+ suitable for interfacing with high-impedance sources such as pH electrodes and photodiodes without significant signal error.
Does ICL7621DCPA+ support programmable quiescent current like other ICL761X family members?
No, the ICL7621DCPA+ features fixed quiescent current of 10μA per amplifier - unlike the ICL761X singles which offer pin-selectable 10μA/100μA/1mA modes. This fixed low-power setting ensures consistent 0.044MHz unity-gain bandwidth and 0.016V/µs slew rate, simplifying design for battery-life-critical applications where variable performance is unnecessary.
Can ICL7621DCPA+ operate from a single 3.3V supply?
Yes, the ICL7621DCPA+ supports single-supply operation from 2V to 16V. When powered from a 3.3V single supply (V+ = 3.3V, V- = 0V), its common-mode input range extends to within 0.4V of each rail, and output swing reaches within ~100mV of each rail - enabling effective use in 3.3V microcontroller-based sensor nodes without level-shifting circuitry.
What is the purpose of the OFFSET pins on ICL7621DCPA+?
The ICL7621DCPA+ provides dedicated OFFSET pins (pins 1 and 8 in 8-pin DIP configuration) for each amplifier to enable external nulling of input offset voltage. A 25kΩ potentiometer connected between these pins, with wiper to V+, allows trimming of VOS - critical for precision DC-coupled applications like strain gauge amplifiers where initial offset must be reduced below 1mV.
Is ICL7621DCPA+ internally compensated for unity-gain stability?
Yes, the ICL7621DCPA+ is internally compensated for stable unity-gain operation - unlike the ICL7614 which requires external compensation. This eliminates the need for external capacitors, simplifies PCB layout, and guarantees phase margin >60° across temperature and supply variations, making it ideal for straightforward buffer and gain-of-one configurations.
ICL7621DCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- 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:
- 15 mV
- Current - Supply:
- 1mA (x2 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ICL7621DCPA+ FAQ
1.How can I place an order for ICL7621DCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7621DCPA+ 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 ICL7621DCPA+ reliable?
The price and inventory of ICL7621DCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7621DCPA+ is usually 5 days.
3.What payment methods are accepted for ICL7621DCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7621DCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7621DCPA+?
ICL7621DCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7621DCPA+ 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 ICL7621DCPA+?
For technical support, including ICL7621DCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7621DCPA+ requirements.
6.How does Aetrix verify that ICL7621DCPA+ is sourced from the original manufacturer or authorized distributors?
All ICL7621DCPA+ 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 ICL7621DCPA+ meets industry standards.
7.What is the process for return or replacement of ICL7621DCPA+?
All ICL7621DCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7621DCPA+, 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 ICL7621DCPA+ part is unused and in its original packaging.
Return procedure for ICL7621DCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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