ICL7621DCBA-T CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The ICL7621DCBA-T is a CMOS amplifier integrated circuit manufactured by Renesas Electronics Corporation, configured as a dual-channel operational amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The ICL7621DCBA-T operates across a supply voltage range of 2V to 16V with a gain bandwidth product of 480 kHz and a slew rate of 0.16V/µs, making it suitable for low-speed, low-power analog signal processing applications.

Substiute Parts

ICL7621DCBA-T

Renesas Electronics CorporationIn Stock: 907ICL7621DCBA-T Datasheet

Current PartRFQ

ICL7621DCBAZ-T

Renesas Electronics CorporationIn Stock: 1451ICL7621DCBAZ-T Datasheet

DirectRFQ

ICL7621BCSA+

Analog Devices Inc./Maxim IntegratedIn Stock: 2444ICL7621BCSA+ Datasheet

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ICL7621BCSA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1417ICL7621BCSA+T Datasheet

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SC2904VDR2G

onsemiIn Stock: 726SC2904VDR2G Datasheet

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TLC25M2CD

Texas InstrumentsIn Stock: 11047TLC25M2CD Datasheet

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TLC25M2CDR

Texas InstrumentsIn Stock: 8658TLC25M2CDR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ICL7621DCBA-T is determined by strict alignment of the following critical parameters: amplifier type (CMOS), number of circuits (2), package type (8-SOIC), mounting method (surface mount), supply voltage range compatibility (minimum 2V, maximum 16V), and operating temperature range (0°C to 70°C). Additional considerations include input bias current, input offset voltage, slew rate, and gain bandwidth product, which define the signal processing capability and noise characteristics of the device.

Substitute parts are grouped into two categories:

Direct Equivalents: Parts that maintain identical or near-identical electrical specifications and are sourced from the same manufacturer (Renesas Electronics Corporation). These parts differ only in packaging format (Tape & Reel versus bulk) or product status (Active versus Obsolete).

Functional Alternatives: Parts from alternative manufacturers (Analog Devices Inc./Maxim Integrated, Texas Instruments, onsemi) that share the same package footprint, dual-channel CMOS architecture, and compatible supply voltage range, but exhibit variations in performance parameters such as slew rate, gain bandwidth product, input offset voltage, and output type configuration.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: ICL7621DCBAZ-T

The ICL7621DCBAZ-T is the direct equivalent of the ICL7621DCBA-T, manufactured by Renesas Electronics Corporation. This part maintains identical electrical specifications including slew rate (0.16V/µs), gain bandwidth product (480 kHz), input bias current (1 pA), and input offset voltage (15 mV). The primary distinction is product status: ICL7621DCBAZ-T is classified as Active, ensuring continued availability and manufacturing support. Additionally, ICL7621DCBAZ-T is ROHS3 compliant, whereas the original ICL7621DCBA-T is RoHS non-compliant. The packaging format differs (Tape & Reel versus bulk), but both utilize the 8-SOIC surface mount package. This part is the preferred direct replacement for obsolete inventory management and new production designs.

Secondary Recommendation: ICL7621BCSA+ or ICL7621BCSA+T

The ICL7621BCSA+ and ICL7621BCSA+T are functionally compatible alternatives sourced from Analog Devices Inc./Maxim Integrated. These parts share the same 8-SOIC package footprint and dual-channel CMOS architecture. Key differences include enhanced performance specifications: slew rate of 1.6V/µs (10× faster than the original), gain bandwidth product of 1.4 MHz (approximately 3× higher), and reduced input offset voltage of 5 mV (versus 15 mV). The output type is specified as Rail-to-Rail, providing extended output swing capability. Supply current per channel is elevated to 1 mA (versus 100 µA), representing a trade-off for improved dynamic performance. Both variants are ROHS3 compliant and Active products. ICL7621BCSA+T is packaged in Tape & Reel format, while ICL7621BCSA+ is supplied in Tube packaging.

Tertiary Recommendation: TLC25M2CD or TLC25M2CDR

The TLC25M2CD and TLC25M2CDR are CMOS amplifiers manufactured by Texas Instruments, part of the LinCMOS™ series. These parts provide superior performance characteristics: slew rate of 2.9V/µs, gain bandwidth product of 1.7 MHz, and exceptionally low input offset voltage of 1.1 mV. The output type is specified as Open Drain, which requires external pull-up resistors but enables flexible output configurations. Input bias current is 0.7 pA, lower than the original device. Supply voltage minimum is reduced to 1.4V, providing extended low-voltage operation capability. TLC25M2CD is classified as Last Time Buy (indicating final production runs), while TLC25M2CDR is Obsolete. Both are ROHS3 compliant. These parts are suitable for applications requiring higher bandwidth and lower offset voltage than the original ICL7621DCBA-T.

Not Recommended: SC2904VDR2G

The SC2904VDR2G, manufactured by onsemi, is a general-purpose amplifier with significantly different electrical characteristics. Input bias current is 45 nA (45,000× higher than the original), and output current capability is 40 mA (40× higher). Operating temperature range extends to -40°C to 85°C, exceeding the original specification. This device is classified as Obsolete and does not provide a suitable functional replacement for the ICL7621DCBA-T in applications requiring low input bias current and low supply current operation.

Frequently Asked Questions (FAQ)

Q: Can the ICL7621DCBAZ-T be used as a direct replacement for the ICL7621DCBA-T?

A: Yes. The ICL7621DCBAZ-T is a direct equivalent with identical electrical specifications. The primary differences are product status (Active versus Obsolete) and packaging format (Tape & Reel versus bulk). Both parts utilize the 8-SOIC surface mount package and are pin-compatible. The ICL7621DCBAZ-T is ROHS3 compliant, whereas the original is RoHS non-compliant.

Q: What are the key performance differences between the ICL7621DCBA-T and the ICL7621BCSA+ alternatives?

A: The ICL7621BCSA+ variants offer enhanced dynamic performance: slew rate is 10× faster (1.6V/µs versus 0.16V/µs), gain bandwidth product is approximately 3× higher (1.4 MHz versus 480 kHz), and input offset voltage is reduced by 67% (5 mV versus 15 mV). These improvements are accompanied by increased supply current per channel (1 mA versus 100 µA) and Rail-to-Rail output capability. Both parts are ROHS3 compliant and Active products.

Q: Are the TLC25M2CD and TLC25M2CDR suitable replacements for low-power applications?

A: The TLC25M2CD and TLC25M2CDR offer superior performance specifications but with trade-offs in power consumption. Supply current per channel is 285 µA (versus 100 µA in the original), representing a 2.85× increase. However, these parts provide significantly lower input offset voltage (1.1 mV versus 15 mV) and higher slew rate (2.9V/µs versus 0.16V/µs). The Open Drain output type requires external pull-up resistors. These parts are suitable for applications prioritizing accuracy and bandwidth over minimum power consumption.

Q: What is the significance of the 8-SOIC package compatibility?

A: All substitute parts listed utilize the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical pin compatibility with the original ICL7621DCBA-T. This package standardization allows direct PCB footprint reuse without layout modifications. All parts are classified as Surface Mount devices with identical package dimensions.

Q: Why is the ICL7621DCBA-T classified as obsolete?

A: The ICL7621DCBA-T is classified as obsolete, indicating that the manufacturer (Renesas Electronics Corporation) has discontinued production and no longer provides manufacturing support. The direct equivalent ICL7621DCBAZ-T is classified as Active and is the recommended replacement for ongoing production and inventory management.

Q: What is the difference between Tape & Reel and Tube packaging?

A: Tape & Reel (TR) packaging is used for automated assembly processes, where components are supplied on continuous carrier tape wound on reels. Tube packaging supplies components in plastic tubes, typically used for manual assembly or lower-volume production. Both packaging formats contain identical components; the difference is in handling and assembly methodology. The ICL7621DCBAZ-T is supplied in Tape & Reel format, while the original ICL7621DCBA-T packaging format is not specified.

Q: Can the SC2904VDR2G be used as a substitute?

A: No. The SC2904VDR2G exhibits fundamentally different electrical characteristics, including input bias current of 45 nA (45,000× higher than the original 1 pA specification) and output current capability of 40 mA (40× higher than the original 1 mA). These differences make it unsuitable for applications designed around the low input bias current and low supply current characteristics of the ICL7621DCBA-T. Additionally, the SC2904VDR2G is classified as Obsolete.

Q: What is RoHS compliance and why does it matter?

A: RoHS (Restriction of Hazardous Substances) compliance indicates that a component meets regulatory requirements restricting the use of specific hazardous materials, including lead, cadmium, and mercury. ROHS3 compliance is the current regulatory standard. The original ICL7621DCBA-T is RoHS non-compliant, while all recommended substitutes (ICL7621DCBAZ-T, ICL7621BCSA+, ICL7621BCSA+T, TLC25M2CD, TLC25M2CDR) are ROHS3 compliant. For new designs and applications subject to environmental regulations, ROHS3-compliant parts are required.

Q: What is the Moisture Sensitivity Level (MSL) and what does MSL 1 mean?

A: Moisture Sensitivity Level (MSL) indicates the component's susceptibility to moisture absorption during storage and handling. MSL 1 (Unlimited) represents the lowest moisture sensitivity classification, indicating that the component can be stored indefinitely without special moisture control measures. All parts listed in this reference, including the original ICL7621DCBA-T and all substitutes, are classified as MSL 1 (Unlimited).