My Inquiry
My Account
Analog Devices Inc./Maxim Integrated ICL7621DESA-T
- Part No.:
- ICL7621DESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7621DESA-T.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,468
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ICL7621DESA-T from Maxim Integrated is a dual, low-power CMOS operational amplifier with pin-selectable quiescent current (10 μA/100 μA/1 mA per amplifier), ultra-low input bias current (1 pA typical), and rail-to-rail output swing within millivolts of supply rails. It operates from ±1 V to ±8 V or 2–16 V single supply, supporting battery-powered pH meters, picoammeters, and long-time-constant integrators.
For engineers reviewing the ICL7621DESA-T datasheet, ICL7621DESA-T pinout, ICL7621DESA-T application, or ICL7621DESA-T equivalent, key selection criteria include its guaranteed −40°C to +85°C operating range, 8-pin SOIC package, programmable IQ, 1 pA input bias current, and compatibility with high-impedance sensor interfaces requiring minimal leakage.
Technical Context
The ICL7621DESA-T implements a dual-channel monolithic CMOS op amp architecture with independent offset null pins per channel and fixed internal frequency compensation for unity-gain stability. Its input stage uses MOSFETs to achieve 10¹² Ω input impedance and 0.01 pA/√Hz input noise current.
Quiescent current is set externally via the IOSET pin on each amplifier - tied to V+ for 10 μA, floating between V−+0.8 V and V+−0.8 V for 100 μA, or tied to V− for 1 mA - directly scaling bandwidth (0.044–1.4 MHz), slew rate (0.016–1.6 V/µs), and output sink capability while preserving rail-to-rail output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables accurate measurement in picoamp-level photodiode or ion-sensor circuits without signal corruption. |
| Supply Voltage Range | ±1 V to ±8 V or 2–16 V single supply - supports direct integration into coin-cell or Li-ion powered portable instrumentation. |
| Output Swing | ±4.7 V min (at ±5 V, −40°C to +85°C, RL = 1 MΩ) - delivers >94% 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 trade-off between power and speed for precision DC vs. moderate-frequency AC applications. |
| Input Offset Voltage | 15 mV max at +25°C (D-grade) - specified for stable DC gain accuracy in integrator and transimpedance configurations. |
| Common-Mode Range | −4.0 V to +4.4 V (at ±5 V, IQ = 10 μA) - accommodates signals near negative rail, critical for single-supply sensor front-ends. |
| Operating Temperature | −40°C to +85°C (E-grade) - qualified for industrial and automotive cabin electronics without derating. |
Pinout & Package
ICL7621DESA-T is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package (SA code), surface-mount, 150 mil body width, with standard JEDEC MO-153 footprint and thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +IN A | Non-inverting input of Amplifier A - high-impedance MOS node for sensor or reference connection. |
| 2 | −IN A | Inverting input of Amplifier A - used for feedback or differential sensing; matched to Pin 1 for common-mode rejection. |
| 3 | OUT A | Amplifier A output - rail-to-rail CMOS driver capable of sourcing/sinking up to 10 mA (IQ = 1 mA). |
| 4 | V− | Negative supply rail - shared return for both amplifiers; must be decoupled locally. |
| 5 | V+ | Positive supply rail - shared power for both amplifiers; accepts up to +16 V (single) or +8 V (dual). |
| 6 | −IN B | Inverting input of Amplifier B - electrically isolated from Channel A; supports dual-sensor or differential pair topologies. |
| 7 | +IN B | Non-inverting input of Amplifier B - identical electrical characteristics to Pin 1; enables matched dual-channel designs. |
| 8 | OUT B | Amplifier B output - independently driven; no crosstalk (120 dB channel separation at AVOL = 100). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical ensures <1 µV error in 1 GΩ source impedance applications like pH electrode buffers. |
| Programmable quiescent current | Three discrete IQ settings (10/100/1000 μA) allow precise optimization of power vs. bandwidth for battery life-critical designs. |
| Rail-to-rail output swing | Swings within 20 mV of rails at light loads - maximizes usable signal range in 3.3 V or lower supply systems. |
| Internal unity-gain compensation | No external capacitor required - simplifies layout and eliminates stability risk in gain ≥1 configurations. |
| Offset null capability | Dedicated OFFSET pins per channel support manual trimming to <1 mV residual offset in precision DC amplifiers. |
Applications
| Portable pH Meter Front-End | Picoammeter Input Stage |
|---|---|
Use Scenario: Measuring microcurrents from glass pH electrodes in handheld field instruments with 10+ year battery life. IC Role / Device Role / Timing Role: Dual-channel ICL7621DESA-T serves as first-stage transimpedance amplifier (Channel A) and reference buffer (Channel B), rejecting common-mode drift. Use Value: 1 pA input bias prevents electrode polarization error; 10 μA IQ setting extends coin-cell life beyond 5 years at 1 reading/minute. | Use Scenario: Detecting femtoamp leakage currents in semiconductor wafer testing fixtures under controlled humidity. IC Role / Device Role / Timing Role: Configured as guarded integrator with 100 pF feedback cap, ICL7621DESA-T integrates charge over 10–100 s intervals. Use Value: 10¹² Ω input resistance and 0.01 pA/√Hz noise current enable sub-100 fA resolution without guard-ring complexity. |
| Low-Droop Sample/Hold Circuit | Hearing Aid Microphone Preamp |
Use Scenario: Capturing slow-varying biomedical signals (e.g., ECG baseline) with hold times >1 hour in implantable monitors. IC Role / Device Role / Timing Role: ICL7621DESA-T Channel A acts as unity-gain buffer driving the hold capacitor; Channel B provides buffered reference. Use Value: 1 pA bias current limits droop to <1 mV/hour on 10 nF hold cap - eliminates need for active refresh circuitry. | Use Scenario: Amplifying 10 mVpp electret microphone output in rechargeable hearing aids with strict 20 µA average current budget. IC Role / Device Role / Timing Role: Single amplifier configured as 40 dB non-inverting gain stage; second channel unused or reserved for AGC control. Use Value: 10 μA IQ mode delivers 100 kHz bandwidth with <10 µV RMS noise - meets IEC 60118-7 SNR requirements at 1.8 V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CDR | Higher input bias (20 pA typ), wider VDD range (3–16 V), no IOSET pin - fixed 110 μA IQ. | Lacks programmable IQ and 1 pA bias; suitable only where 20× higher input leakage is acceptable. | Select ICL7621DESA-T when sub-5 pA bias is mandatory; choose TLC27L2CDR only if cost sensitivity outweighs leakage performance. |
| OPA2313IDR | Lower noise (14 nV/√Hz vs. 100 nV/√Hz), rail-to-rail I/O, but 100× higher input bias (100 pA typ) and no offset null pins. | Optimized for audio/low-noise AC, not ultra-high-Z DC - unsuitable for pH or picoammeter use. | Choose ICL7621DESA-T for DC-critical, high-impedance sensors; OPA2313IDR fits battery-powered audio preamps needing lower voltage noise. |
Compared with TLC27L2CDR and OPA2313IDR, the ICL7621DESA-T uniquely combines 1 pA input bias, programmable IQ, and offset nulling in an industrial-temperature 8-pin SOIC - making it irreplaceable in ultra-low-leakage DC measurement systems.
Availability
ICL7621DESA-T is available at Aetrix Electronics and suitable for portable medical diagnostics, environmental sensor nodes, and industrial process analyzers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for ICL7621DESA-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 industrial, medical, and communications applications.
The ICL76xx family was engineered specifically for ultra-low-input-current, low-power operational amplification in battery-operated and high-impedance measurement systems - prioritizing bias current, supply flexibility, and temperature stability over speed.
FAQ
What is the guaranteed input bias current specification for ICL7621DESA-T over its full operating temperature range?
The ICL7621DESA-T guarantees a maximum input bias current of 4000 pA (4 nA) over −40°C to +85°C, with 1 pA typical at +25°C. This specification is confirmed in the Electrical Characteristics table for ICL76XXE grade devices under "Input Bias Current" with E-series temperature range conditions.
Does ICL7621DESA-T require external frequency compensation capacitors?
No, the ICL7621DESA-T does not require external frequency compensation. As stated in the Detailed Description section, all ICL7621 series devices are internally compensated for unity-gain operation - unlike the ICL7614 which requires external compensation.
Can both amplifiers in ICL7621DESA-T operate at different quiescent current settings simultaneously?
No - the ICL7621DESA-T has fixed quiescent current per channel and does not support independent IQ programming. Unlike the single-amplifier ICL761X variants, the dual ICL7621 series features factory-set IQ (100 μA for ICL7621D grade), with no IOSET pin provided. The datasheet explicitly states "dual and quad amplifiers have fixed quiescent current settings."
What is the maximum output current capability of ICL7621DESA-T at ±5 V supply?
At ±5 V supply, the ICL7621DESA-T delivers a minimum output sink current of 10 mA and source current of 8 mA (per channel), as verified in the "Maximum Output Sink/Source Current vs. Supply Voltage" typical curves on page 17 of the datasheet, with IQ = 100 μA condition.
Is ICL7621DESA-T pin-compatible with other members of the ICL7621 family such as ICL7621BCSA?
Yes - all ICL7621 variants in the 8-pin SOIC (SA) package share identical pinout and footprint, including ICL7621BCSA, ICL7621DCSA, and ICL7621DESA-T. The ordering code suffix (B/C/D/E) denotes input offset voltage grade and temperature range, not pin configuration or internal connectivity.
ICL7621DESA-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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7621DESA-T FAQ
1.How can I place an order for ICL7621DESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7621DESA-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 ICL7621DESA-T reliable?
The price and inventory of ICL7621DESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7621DESA-T is usually 5 days.
3.What payment methods are accepted for ICL7621DESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7621DESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7621DESA-T?
ICL7621DESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7621DESA-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 ICL7621DESA-T?
For technical support, including ICL7621DESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7621DESA-T requirements.
6.How does Aetrix verify that ICL7621DESA-T is sourced from the original manufacturer or authorized distributors?
All ICL7621DESA-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 ICL7621DESA-T meets industry standards.
7.What is the process for return or replacement of ICL7621DESA-T?
All ICL7621DESA-T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7621DESA-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 ICL7621DESA-T part is unused and in its original packaging.
Return procedure for ICL7621DESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICL7621DESA-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…
