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Analog Devices Inc./Maxim Integrated ICL7621BESA+
- Part No.:
- ICL7621BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7621BESA+.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,687
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Product details
Overview
ICL7621BESA+ from Maxim Integrated is a dual, low-power CMOS operational amplifier optimized for ultra-low input bias current (1 pA typical) and programmable quiescent current (10/100/1000 µA per amplifier), operating from ±1V to ±8V supplies or 2V–16V single supply. It features rail-to-rail output swing, 10¹² Ω input impedance, and 0.044 MHz unity-gain bandwidth at 10 µA IQ - ideal for pH meter front-ends and photodiode amplifiers requiring minimal input loading.
For engineers reviewing the ICL7621BESA+ datasheet, ICL7621BESA+ pinout, ICL7621BESA+ application, or ICL7621BESA+ equivalent, key selection criteria include its -40°C to +85°C temperature range, 8-pin SOIC package, dual-channel architecture with independent offset null capability, and verified performance in low-leakage, long-time-constant integrator, and battery-powered instrumentation designs.
Technical Context
The ICL7621BESA+ implements a monolithic CMOS input stage with gate-protected p-channel inputs enabling 1 pA typical input bias current and 10¹² Ω input resistance. Its quiescent current is fixed per channel at 10 µA, 100 µA, or 1 mA depending on external voltage applied to the IOSET pin - though for the dual ICL7621 variant, IQ is factory-set and not user-programmable per amplifier.
Internally compensated for unity-gain stability, it delivers 86 dB large-signal voltage gain (RL = 1 MΩ, ±4 V output), 80 dB CMRR and PSRR, and 0.01 pA/√Hz input noise current. Output swing reaches ±4.7 V (vs. ±5 V rails) under E-grade conditions (–40°C to +85°C) with 1 MΩ load and 10 µA IQ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate measurement of picoamp-level photocurrents without signal corruption. |
| 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. |
| Unity-Gain Bandwidth | 0.044 MHz at 10 µA IQ - sufficient for DC–44 kHz sensor signal conditioning with low power overhead. |
| Input Impedance | 10¹² Ω - preserves signal integrity when interfacing high-impedance sources like glass pH electrodes. |
| Output Voltage Swing | ±4.7 V into 1 MΩ at –40°C to +85°C - delivers >94% rail utilization for dynamic range maximization. |
| Input Offset Voltage | 5 mV max at +25°C (B-grade) - enables precision DC-coupled amplification without excessive trimming. |
| Common-Mode Rejection | 76 dB min at 10 µA IQ - suppresses interference in noisy industrial or medical sensor environments. |
Pinout & Package
ICL7621BESA+ is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package (SA code), surface-mount, RoHS-compliant, with standard industry pinout compatible with dual op-amp footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +IN A | Non-inverting input of amplifier A - high-impedance node for sensor signal injection. |
| 2 | –IN A | Inverting input of amplifier A - used for feedback or differential sensing configuration. |
| 3 | V– | Negative supply rail - referenced to system ground in single-supply configurations. |
| 4 | OUT A | Amplifier A output - capable of sourcing/sinking current while swinging within 300 mV of rails. |
| 5 | OUT B | Amplifier B output - electrically isolated from OUT A; supports dual-channel signal processing. |
| 6 | –IN B | Inverting input of amplifier B - independent of amplifier A for multi-sensor or differential pair use. |
| 7 | +IN B | Non-inverting input of amplifier B - matches pin 1 functionality for second channel. |
| 8 | V+ | Positive supply rail - accepts up to +16 V in single-supply mode or +8 V in split-supply mode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical ensures <100 nV error from 100 MΩ source impedance - critical for electrochemical sensors. |
| Rail-to-rail output swing | Swings within 300 mV of V+ and V– rails - maximizes dynamic range in low-voltage battery systems. |
| Offset null capability | Dual independent OFFSET pins (pins 1 & 8 on ICL761X; not present on ICL7621 - confirmed from pin config: no OFFSET pins shown for dual variants) - wait: correction - per Datasheet Fig. 2 (Duals-ICL7621/22), there are *no* dedicated OFFSET pins. ICL7621 does NOT support offset nulling. Feature removed. |
| Fixed low quiescent current | 10 µA per amplifier (B-grade) - enables >1-year operation on CR2032 in always-on sensor nodes. |
| Wide supply range | Operates from ±1 V to ±8 V - accommodates both ultra-low-voltage IoT nodes and legacy industrial rails. |
| High input impedance | 10¹² Ω - prevents loading of high-Z transducers such as piezoelectric accelerometers or ion-selective electrodes. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: Amplifying microvolt-level DC output from glass pH electrode immersed in aqueous solution. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage with ultra-high input impedance to prevent electrode polarization. Use Value: 1 pA input bias current avoids >1 mV error across 1 GΩ electrode impedance, ensuring ±0.01 pH accuracy. |
Use Scenario: Converting nanoampere photocurrent from silicon photodiode into measurable voltage signal. IC Role / Device Role / Timing Role: Low-noise, low-bias-current transimpedance amplifier with stable DC operating point. Use Value: 0.01 pA/√Hz input current noise minimizes shot-noise-limited detection floor in optical sensing. |
| Long-Time-Constant Integrator | Battery-Powered Data Logger |
|
Use Scenario: Integrating leakage current from capacitor-based energy harvesting storage over hours/days. IC Role / Device Role / Timing Role: Ultra-low-input-current integrator core with programmable time constant via external RC. Use Value: 1 pA bias current limits integration drift to <1 µV/s - enabling stable 10⁶-second time constants. |
Use Scenario: Signal conditioning for temperature/humidity sensors in remote environmental monitoring node. IC Role / Device Role / Timing Role: Dual-channel analog front-end for simultaneous sensor readout with sleep-mode current <15 µA total. Use Value: 10 µA per amplifier enables 2-channel operation at <30 µA total supply current - extending CR2032 life to >2 years. |
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 |
|---|---|---|---|
| LTC1052IS8#PBF | Chopper-stabilized, 0.5 µV max VOS, 50 fA IB, but 125 µA ISUPP - 12× higher quiescent current than ICL7621BESA+. | Superior DC precision for zero-drift applications; unsuitable for ultra-low-power battery operation. | Select LTC1052IS8#PBF only when sub-µV offset and near-zero drift outweigh power budget constraints. |
| TLC27L2CDR | CMOS, 30 pA IB (typ), 110 µA ISUPP, 1.7 MHz GBW - 30× higher bias current, 11× higher supply current vs. ICL7621BESA+. | Higher speed and cost-effective for less demanding leakage-sensitive applications. | Choose TLC27L2CDR where 30 pA bias suffices and bandwidth >100 kHz is required - not for picoamp-level signals. |
Compared with LTC1052IS8#PBF and TLC27L2CDR, the ICL7621BESA+ uniquely balances picoampere-level input bias (1 pA), micropower operation (10 µA/amplifier), and industrial temperature range (–40°C to +85°C) - making it the optimal choice for long-duration, high-impedance, battery-constrained sensing.
Availability
ICL7621BESA+ is available at Aetrix Electronics and suitable for pH meter front-ends, photodiode amplifiers, and long-time-constant integrators requiring stable component supply across extended production lifecycles.
Supply support for ICL7621BESA+ 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 systems.
The ICL7621BESA+ belongs to the ICL761X–ICL764X family - engineered specifically for ultra-low-input-current, low-power operational amplification in electrochemical, photonic, and energy-harvesting applications.
FAQ
What is the input bias current specification for ICL7621BESA+ at room temperature?
The ICL7621BESA+ has a typical input bias current of 1 pA at +25°C, with a maximum of 4 nA at +125°C. This ultra-low value is achieved via its protected p-channel CMOS input stage and makes the ICL7621BESA+ especially suitable for interfacing with high-impedance sensors such as pH electrodes and photodiodes where leakage current would otherwise dominate signal accuracy.
Does ICL7621BESA+ support offset nulling like some other ICL76XX devices?
No, the ICL7621BESA+ does not provide offset nulling capability. Unlike the single-amplifier ICL761X series (which feature dedicated OFFSET pins), the dual ICL7621 variant omits these terminals - as confirmed by its official pin configuration diagram showing only V+, V–, two IN+/IN– pairs, and two outputs. The ICL7621BESA+ relies on its specified 5 mV max input offset voltage (B-grade) and inherent CMOS matching for DC accuracy.
What is the operating temperature range certified for ICL7621BESA+?
The ICL7621BESA+ is rated for operation from –40°C to +85°C (E-grade), as indicated by the "E" suffix in its part number and confirmed in the Ordering Information table. This industrial temperature range ensures reliable performance in outdoor instrumentation, automotive cabin modules, and uncontrolled-environment data loggers where ambient extremes are expected.
Can ICL7621BESA+ be used with single-supply configurations?
Yes, the ICL7621BESA+ supports true single-supply operation from 2 V to 16 V. Its input common-mode range extends to within 0.4 V of V– (ground) and 0.6 V below V+, and its output swings to within ~300 mV of both rails - enabling rail-to-rail signal handling in 3.3 V or 5 V systems without level-shifting circuitry. This is explicitly validated in the Electrical Characteristics tables under "Common-Mode Voltage Range" and "Output Voltage Swing".
Is the quiescent current of ICL7621BESA+ user-programmable?
No, the ICL7621BESA+ has a fixed quiescent current per amplifier - unlike the single ICL761X or triple ICL763X variants that feature an IOSET pin. The "B" grade corresponds to a factory-set 10 µA per amplifier (confirmed in Electrical Characteristics tables), and no external pin allows adjustment. This simplifies design while guaranteeing consistent low-power behavior across all units.
ICL7621BESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7621BESA+ FAQ
1.How can I place an order for ICL7621BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7621BESA+ 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 ICL7621BESA+ reliable?
The price and inventory of ICL7621BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7621BESA+ is usually 5 days.
3.What payment methods are accepted for ICL7621BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7621BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7621BESA+?
ICL7621BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7621BESA+ 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 ICL7621BESA+?
For technical support, including ICL7621BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7621BESA+ requirements.
6.How does Aetrix verify that ICL7621BESA+ is sourced from the original manufacturer or authorized distributors?
All ICL7621BESA+ 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 ICL7621BESA+ meets industry standards.
7.What is the process for return or replacement of ICL7621BESA+?
All ICL7621BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7621BESA+, 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 ICL7621BESA+ part is unused and in its original packaging.
Return procedure for ICL7621BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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