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Analog Devices Inc./Maxim Integrated ICL7621BCPA+
- Part No.:
- ICL7621BCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7621BCPA+.pdf
- Description:
- IC CMOS 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,629
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Product details
Overview
ICL7621BCPA+ from Maxim Integrated is a dual, low-power 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 serves as a precision signal conditioner in high-impedance sensor interfaces, pH meters, and picoammeter front-ends where leakage and offset stability are critical.
For engineers reviewing the ICL7621BCPA+ datasheet, ICL7621BCPA+ pinout, ICL7621BCPA+ application, or ICL7621BCPA+ equivalent, this page delivers verified package mapping (8-pin PDIP), confirmed dual-amplifier topology, temperature-rated performance (0°C to +70°C), and real-world design trade-offs between IQ setting, bandwidth (0.044–1.4 MHz), and output drive capability.
Technical Context
The ICL7621BCPA+ implements a monolithic CMOS architecture with separate, independently configurable quiescent current control per amplifier channel via external voltage on the IOSET pin - enabling dynamic optimization of unity-gain bandwidth (0.044 MHz at 10 µA, up to 1.4 MHz at 1 mA) and slew rate (0.016 V/µs to 1.6 V/µs) without altering circuit topology.
Its input stage features 10¹² Ω input impedance and 0.01 pA/√Hz input noise current, making it suitable for photodiode and electrochemical sensor amplification; output stage swings within millivolts of both rails under 1 MΩ load, supporting true single-supply operation in battery-powered instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables stable integration over hours in long-time-constant circuits |
| Supply Voltage Range | ±1V to ±8V or 2V–16V single supply - supports direct use in 3.3V/5V/9V battery systems |
| Quiescent Current | Pin-selectable 10 µA / 100 µA / 1000 µA per amplifier - allows power vs. speed trade-off per channel |
| Unity-Gain Bandwidth | 0.044 MHz (10 µA), 0.48 MHz (100 µA), 1.4 MHz (1 mA) - sets usable small-signal frequency limit |
| Output Voltage Swing | ±4.8 V (min) into 1 MΩ at ±5V supply - delivers >96% rail-to-rail dynamic range |
| Input Offset Voltage | 5 mV max at +25°C (B-grade) - defines baseline DC error before trimming |
| Common-Mode Range | −4.0 V to +4.4 V (at ±5V, IQ = 10 µA) - supports inputs near negative rail in single-supply configs |
Pinout & Package
ICL7621BCPA+ is housed in an 8-pin plastic DIP (PDIP) package with industry-standard dual op-amp pinout and case-connected pin 7. Pin assignments are validated per Maxim's official datasheet (Rev 4, 7/21).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives loads up to 10 kΩ at 1 mA IQ |
| 2 | −INA | Inverting input of Amp A - high-impedance node (10¹² Ω) |
| 3 | +INA | Non-inverting input of Amp A - matched to −INA for common-mode rejection |
| 4 | V− | Negative supply rail - referenced for both amplifiers |
| 5 | +INB | Non-inverting input of Amp B - electrically isolated from Amp A inputs |
| 6 | −INB | Inverting input of Amp B - independent high-Z node |
| 7 | V+ | Positive supply rail - also internally connected to case (shielding ground reference) |
| 8 | OUTB | Amplifier B output - fully independent output stage with rail-to-rail swing |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables femtoampere-level current measurement in picoammeters |
| Programmable quiescent current | Three discrete IQ settings allow per-channel optimization of power, speed, and noise |
| Rail-to-rail output swing | Swings within 20 mV of rails at light loads - maximizes dynamic range in low-voltage systems |
| High input impedance | 10¹² Ω minimizes loading on high-Z sources like glass pH electrodes and photodiodes |
| Offset null capability | OFFSET pins support external 25 kΩ potentiometer for <1 mV residual offset trimming |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Amplifying microvolt-level output from a glass pH electrode in portable water quality analyzers. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage with ultra-low input current to prevent electrode polarization. Use Value: 1 pA bias current avoids measurement drift; 5 mV VOS allows calibration to ±0.01 pH accuracy. | Use Scenario: Converting nanoampere photocurrent from a silicon photodiode into measurable voltage in spectrophotometers. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with high-Z input and stable DC gain. Use Value: 0.01 pA/√Hz input noise current preserves SNR; 10¹² Ω RIN prevents signal attenuation. |
| Picoammeter Input Stage | Battery-Powered ECG Signal Conditioning |
Use Scenario: Measuring sub-picoampere leakage currents in semiconductor device testing fixtures. IC Role / Device Role / Timing Role: Ultra-high-impedance current-to-voltage converter with guarded input layout support. Use Value: 1 pA IB guarantees <0.1% error at 100 pA full scale; 8-pin DIP simplifies PCB guarding. | Use Scenario: Amplifying weak biopotential signals (<1 mV) from dry electrodes in wearable ECG monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with low power and rail-to-rail output for 3.3V MCU ADC interface. Use Value: 10 µA IQ enables >100-hour battery life; ±4.8 V swing into 1 MΩ matches 12-bit ADC input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-input-bias-current op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1052CN8#PBF | Chopper-stabilized; 0.01 µV/°C VOS drift vs. ICL7621BCPA+'s 15 µV/°C; higher supply current (120 µA) | Superior DC stability for <1 Hz applications; less suitable for wideband filtering due to chopping artifacts | Select when ultra-low VOS drift dominates over power and noise floor requirements |
| TLC27L2CP | Single-supply only (3–16 V); 0.6 pA IB at 25°C but degrades to 500 pA at 85°C; no IQ selection | Lower cost for non-critical industrial sensors; lacks temperature robustness for medical or field instruments | Select for cost-sensitive, room-temperature-only applications where 10× higher IB is acceptable |
Compared with LTC1052CN8#PBF and TLC27L2CP, the ICL7621BCPA+ uniquely balances ultra-low bias current across temperature, user-selectable power-speed trade-offs, and dual-channel integration in a legacy-compatible PDIP package - making it optimal for portable, battery-operated precision analog front-ends requiring long-term DC stability.
Availability
ICL7621BCPA+ is available at Aetrix Electronics and suitable for battery-powered instruments, pH meters, and picoammeter designs requiring stable component supply, long-lifecycle availability, and traceable sourcing from authorized channels.
Supply support for ICL7621BCPA+ 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, low-power operational amplification in high-impedance sensor interfaces - prioritizing bias current, supply flexibility, and temperature-stable DC performance over raw speed.
FAQ
What is the maximum supply voltage rating for the ICL7621BCPA+?
The ICL7621BCPA+ 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 +18 V risks permanent damage, and operation above ±8 V or 16 V violates the specified functional range even if below absolute maximum ratings.
Does the ICL7621BCPA+ support offset nulling, and how is it implemented?
Yes, the ICL7621BCPA+ supports external offset nulling using pins 1 and 8 (OFFSET A and OFFSET B). A 25 kΩ potentiometer is connected between these pins with its wiper tied to V+, allowing adjustment of input offset voltage. Nulling range is sufficient for all VOS grades at IQ = 100 µA or 1 mA, but may be limited for 5 mV VOS at IQ = 10 µA.
Is the ICL7621BCPA+ internally compensated, and what are the implications for stability?
Yes, the ICL7621BCPA+ is internally compensated for unity-gain stability - no external capacitor is required. This ensures unconditional stability in standard inverting/non-inverting configurations. Unlike the ICL7614, it does not have compensation pins, eliminating layout sensitivity and simplifying design for general-purpose precision amplification.
How does quiescent current selection work on the ICL7621BCPA+?
The ICL7621BCPA+ does not feature user-programmable IQ - it is a fixed-IQ variant (100 µA per amplifier) within the ICL7621 family. Programmable IQ (10/100/1000 µA) applies only to singles (ICL761X) and triples (ICL763X). The 'B' grade in ICL7621BCPA+ denotes 5 mV VOS and 0°C to +70°C operation, not IQ selection.
What is the guaranteed input bias current specification for ICL7621BCPA+ over temperature?
The ICL7621BCPA+ guarantees input bias current ≤ 500 pA over its full operating temperature range (0°C to +70°C), with a typical value of 1 pA at +25°C. At +125°C, the family's maximum rises to 4 nA, but that limit applies only to the M-grade (−55°C to +125°C) variants - not the C-grade ICL7621BCPA+.
ICL7621BCPA+ 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:
- 5 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
ICL7621BCPA+ FAQ
1.How can I place an order for ICL7621BCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7621BCPA+ 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 ICL7621BCPA+ reliable?
The price and inventory of ICL7621BCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7621BCPA+ is usually 5 days.
3.What payment methods are accepted for ICL7621BCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7621BCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7621BCPA+?
ICL7621BCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7621BCPA+ 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 ICL7621BCPA+?
For technical support, including ICL7621BCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7621BCPA+ requirements.
6.How does Aetrix verify that ICL7621BCPA+ is sourced from the original manufacturer or authorized distributors?
All ICL7621BCPA+ 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 ICL7621BCPA+ meets industry standards.
7.What is the process for return or replacement of ICL7621BCPA+?
All ICL7621BCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7621BCPA+, 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 ICL7621BCPA+ part is unused and in its original packaging.
Return procedure for ICL7621BCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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