My Inquiry
My Account
Analog Devices Inc./Maxim Integrated ICL7621DCSA-T
- Part No.:
- ICL7621DCSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7621DCSA-T.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,419
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ICL7621DCSA-T 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, long-time-constant integrators, and battery-powered instrumentation.
For engineers reviewing the ICL7621DCSA-T datasheet, ICL7621DCSA-T pinout, ICL7621DCSA-T application, or ICL7621DCSA-T equivalent, key selection criteria include its 1 pA input bias current, 15 mV max input offset voltage (D-grade), 8-pin SOIC package, and temperature range of 0°C to +70°C - critical for pH meters, photodiode amplifiers, and picoammeters where leakage and drift dominate error budgets.
Technical Context
The ICL7621DCSA-T implements a dual-channel monolithic CMOS architecture with independent quiescent current control per amplifier via external pin configuration (though fixed IQ per channel in dual variants). Its input stage uses MOSFETs with 10¹² Ω input impedance and 0.01 pA/√Hz input noise current, enabling stable operation with multi-gigaohm source impedances.
It features internally compensated unity-gain stability, rail-swing CMOS outputs (±4.8 V at ±5 V supply, RL = 1 MΩ), and programmable bandwidth/slew rate: 0.044 MHz GBW / 0.016 V/µs SR at 10 µA IQ, scaling to 1.4 MHz / 1.6 V/µs at 1 mA IQ - all while maintaining >70 dB CMRR and PSRR across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical (25°C); enables use with >1 GΩ sensors without significant DC error |
| Input Offset Voltage | 15 mV max (25°C); D-grade part supports cost-sensitive precision applications with moderate offset tolerance |
| Supply Voltage Range | ±1 V to ±8 V or 2 V to 16 V single supply; accommodates coin-cell (3 V) and industrial (15 V) rails |
| Output Swing | ±4.8 V into 1 MΩ at ±5 V supply; delivers >96% rail-to-rail dynamic range for maximum signal fidelity |
| Unity-Gain Bandwidth | 0.044 MHz at 10 µA IQ; sufficient for sub-10 Hz sensor conditioning and integrator time constants >10 s |
| Common-Mode Rejection | 70 dB min at 1 mA IQ; maintains accuracy in noisy industrial environments with common-mode transients |
| Operating Temperature | 0°C to +70°C (C-grade); validated for commercial instrumentation and portable medical devices |
Pinout & Package
ICL7621DCSA-T is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package (SA code), 3.9 mm × 4.9 mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output; rail-to-rail CMOS driver capable of sourcing/sinking ≥1 mA |
| 2 | -INA | Inverting input of Amplifier A; 10¹² Ω impedance, sensitive to PCB leakage and guarding |
| 3 | +INA | Non-inverting input of Amplifier A; matched to -INA for optimal CMRR |
| 4 | V− | Negative supply rail; must be decoupled locally to minimize PSRR degradation |
| 5 | V+ | Positive supply rail; accepts up to +16 V (single) or ±8 V (dual) with 18 V absolute max |
| 6 | +INB | Non-inverting input of Amplifier B; electrically isolated from Amplifier A for dual-channel operation |
| 7 | -INB | Inverting input of Amplifier B; shares same ultra-low bias current spec as -INA |
| 8 | OUTB | Amplifier B output; fully independent, with identical AC/DC specs to OUTA |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical ensures <100 nV error from 100 MΩ source resistance at 25°C |
| Rail-to-rail CMOS output | Swings within 20 mV of rails at light loads, maximizing dynamic range in low-voltage systems |
| Programmable power/performance | Three IQ settings (10/100/1000 µA) let designers trade bandwidth (0.044–1.4 MHz) for battery life |
| High input impedance | 10¹² Ω minimizes loading on high-Z sources like glass pH electrodes and photodiodes |
| Internal unity-gain compensation | Stable at AV = 1 without external components - simplifies layout and reduces BOM count |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: High-impedance glass electrode (≥1 GΩ) measuring H⁺ ion concentration in aqueous solution. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and offset-adjusted amplifier conditioning microamp-level electrode current. Use Value: 1 pA input bias prevents electrode polarization and drift; 15 mV VOS allows calibration via software or potentiometer. |
Use Scenario: Converting weak photocurrent (pA–nA) from a reverse-biased silicon photodiode into measurable voltage. IC Role / Device Role / Timing Role: Low-noise, low-input-current transimpedance amplifier with stable gain and minimal dark-current error. Use Value: 0.01 pA/√Hz input noise current preserves SNR; rail-swing output drives ADC directly without level-shifting. |
| Picoammeter Input Stage | Low-Droop Sample-and-Hold Circuit |
|
Use Scenario: Measuring ultra-low leakage currents (<100 pA) in semiconductor test fixtures or capacitor dielectric testing. IC Role / Device Role / Timing Role: Guarded, low-bias-current input amplifier feeding a precision integrator or feedback DAC. Use Value: Sub-pA bias enables accurate integration over seconds; 10¹² Ω input resistance avoids parallel leakage paths. |
Use Scenario: Holding analog sensor output during ADC conversion in portable data loggers with multi-second sampling intervals. IC Role / Device Role / Timing Role: Ultra-low-leakage unity-gain follower isolating hold capacitor from source impedance. Use Value: 1 pA bias current limits droop to <1 mV/s on 1 nF capacitor - enabling >10 s hold times with <10 mV error. |
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 |
|---|---|---|---|
| LTC1052CS8#PBF | Chopper-stabilized; 0.005 µV/°C VOS drift vs. ICL7621DCSA-T's 25 µV/°C; higher 1/f noise; 1.2 mA IQ | Better DC precision in varying temperature; less suitable for low-noise AC signal paths | Select when VOS drift dominates error budget and supply current >1 mA is acceptable |
| TLC27L2CDR | Single-supply only (3–16 V); 0.6 pA IB max at 25°C; 10 mV VOS max (A-grade); no IQ programming | Lower-cost alternative for fixed 5 V or 3.3 V systems; lacks dual-supply flexibility and IQ tuning | Select for cost-sensitive, single-rail designs where programmable IQ and dual-supply operation are unnecessary |
Compared with LTC1052CS8#PBF and TLC27L2CDR, the ICL7621DCSA-T uniquely balances ultra-low bias current, dual-supply operation, programmable IQ, and industry-standard SOIC-8 pinout - making it optimal for battery-powered, high-impedance measurement systems requiring design flexibility and proven reliability.
Availability
ICL7621DCSA-T is available at Aetrix Electronics and suitable for pH meter front-ends, photodiode transimpedance amplifiers, and picoammeter input stages requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for ICL7621DCSA-T 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 instrumentation applications.
The ICL7621DCSA-T belongs to the ICL761X–ICL764X family - engineered specifically for ultra-low-input-current, low-power signal conditioning in high-impedance, battery-operated measurement systems.
FAQ
What is the maximum supply voltage rating for the ICL7621DCSA-T?
The ICL7621DCSA-T has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates across a wide range: ±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 functional range even if below absolute max.
Does the ICL7621DCSA-T support pin-selectable quiescent current like the single-channel ICL7611?
No. The ICL7621DCSA-T is a dual op amp with fixed quiescent current per amplifier - unlike the single-channel ICL7611 or triple-channel ICL7631, which feature an IQ pin for 10/100/1000 µA selection. The ICL7621DCSA-T's IQ is factory-set and not user-programmable.
What is the input offset voltage specification for the ICL7621DCSA-T at full temperature range?
For the ICL7621DCSA-T (D-grade), the input offset voltage is specified as 20 mV maximum over the full operating temperature range of 0°C to +70°C. At +25°C only, it is 15 mV max - consistent with the 'D' suffix in the ordering code indicating the 15 mV (25°C) / 20 mV (full range) VOS bin.
Can the ICL7621DCSA-T drive a 10 kΩ load while maintaining rail-to-rail output swing?
Yes, but with reduced swing. At ±5 V supply and 1 mA IQ, the ICL7621DCSA-T delivers ±4.5 V output swing into 10 kΩ (90% of rails). At lower IQ (10 µA), output swing degrades significantly under 10 kΩ load - use ≥100 kΩ for optimal rail-swing performance at low power.
Is the ICL7621DCSA-T internally compensated for unity-gain stability?
Yes. The ICL7621DCSA-T is internally compensated and stable at unity-gain (AV = +1) without external components. This applies to all ICL7621 variants except those derived from externally compensated families (e.g., ICL7614), which the ICL7621 is not.
ICL7621DCSA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7621DCSA-T FAQ
1.How can I place an order for ICL7621DCSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7621DCSA-T 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 ICL7621DCSA-T reliable?
The price and inventory of ICL7621DCSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7621DCSA-T is usually 5 days.
3.What payment methods are accepted for ICL7621DCSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7621DCSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7621DCSA-T?
ICL7621DCSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7621DCSA-T 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 ICL7621DCSA-T?
For technical support, including ICL7621DCSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7621DCSA-T requirements.
6.How does Aetrix verify that ICL7621DCSA-T is sourced from the original manufacturer or authorized distributors?
All ICL7621DCSA-T 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 ICL7621DCSA-T meets industry standards.
7.What is the process for return or replacement of ICL7621DCSA-T?
All ICL7621DCSA-T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7621DCSA-T, 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 ICL7621DCSA-T part is unused and in its original packaging.
Return procedure for ICL7621DCSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICL7621DCSA-T Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
