SC224NG Equivalent & Substitute Parts

Part Overview

The SC224NG is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a 4-circuit device in a 14-pin DIP package. This component is classified as obsolete, indicating that direct procurement from primary sources may be limited. The SC224NG operates across a supply voltage range of 3V to 32V and is designed for through-hole mounting applications. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for legacy and new applications utilizing this amplifier topology.

Substiute Parts

SC224NG

onsemiIn Stock: 886SC224NG Datasheet

Current PartRFQ

LM224DR2G

onsemiIn Stock: 105290LM224DR2G Datasheet

DirectRFQ

LF347BN/NOPB

Texas InstrumentsIn Stock: 2182LF347BN/NOPB Datasheet

SimilarRFQ

LF347N

STMicroelectronicsIn Stock: 40463LF347N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC224NG is determined by the following critical parameters: amplifier type (general purpose vs. J-FET), number of circuits (4), output current per channel (40 mA), supply voltage range (3V to 32V minimum), operating temperature range, and physical package compatibility.

The substitute parts are grouped into two categories:

Direct Functional Substitute (Different Packaging): The LM224DR2G maintains identical electrical specifications for general-purpose amplification with 4 circuits and 40 mA output current per channel. However, this part transitions from through-hole to surface-mount technology (14-SOIC package) and shifts from obsolete to active product status.

Similar Functional Substitutes (Different Amplifier Architecture): The LF347BN/NOPB and LF347N represent J-FET amplifier topologies rather than general-purpose designs. These parts maintain the 4-circuit configuration and through-hole 14-DIP package format but introduce different electrical characteristics including significantly lower input bias current (50 pA and 20 pA respectively versus 3 nA), higher slew rates (13V/µs and 16V/µs), and different supply voltage requirements (36V fixed versus 3V to 32V variable range).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Active Product Status:

The LM224DR2G is the primary substitute when component availability and active product support are required. This part maintains electrical equivalence with the SC224NG across all critical parameters: 4-circuit configuration, 40 mA output current per channel, 3V to 32V supply range, and 2 mV input offset voltage. The LM224DR2G is manufactured by onsemi (same as the original part) and carries active product status with ROHS3 compliance. The transition from 14-DIP through-hole to 14-SOIC surface-mount packaging requires PCB redesign and assembly process modification.

For Through-Hole Package Retention:

When through-hole mounting is mandatory and PCB redesign is not feasible, the LF347BN/NOPB and LF347N maintain the 14-DIP package format. Both parts retain the 4-circuit configuration and 40 mA output current per channel. The LF347BN/NOPB is manufactured by Texas Instruments with active product status and ROHS3 compliance. The LF347N is manufactured by STMicroelectronics with obsolete product status. Both J-FET variants introduce circuit-level differences: significantly lower input bias current (50 pA and 20 pA versus 3 nA), higher slew rates (13V/µs to 16V/µs versus unspecified), and fixed 36V to 44V supply requirements versus the SC224NG's 3V to 32V range. These differences require circuit analysis to confirm compatibility with existing power supply and signal conditioning designs.

Compliance Considerations:

The LM224DR2G and LF347BN/NOPB both carry ROHS3 compliance and active product status, supporting modern manufacturing and environmental regulations. The LF347N, while ROHS3 compliant, carries obsolete product status, limiting long-term availability assurance.

Frequently Asked Questions (FAQ)

Q: Can the LM224DR2G directly replace the SC224NG in an existing PCB?

A: The LM224DR2G is electrically equivalent to the SC224NG but requires PCB redesign. The SC224NG uses a 14-DIP through-hole package (0.300" width, 7.62mm), while the LM224DR2G uses a 14-SOIC surface-mount package (0.154" width, 3.90mm). Socket and trace layouts must be modified accordingly.

Q: What are the key differences between the SC224NG and the LF347 series substitutes?

A: The SC224NG is a general-purpose amplifier with 3 nA input bias current and a 3V to 32V supply range. The LF347BN/NOPB and LF347N are J-FET amplifiers with significantly lower input bias current (50 pA and 20 pA respectively) and fixed 36V to 44V supply requirements. These architectural differences affect circuit performance in applications sensitive to input bias current or requiring variable supply voltages.

Q: Is the LF347N suitable for new designs?

A: The LF347N carries obsolete product status, indicating limited availability and no active manufacturer support. For new designs, the LF347BN/NOPB (active status, Texas Instruments) is preferred if J-FET amplifier characteristics are required and through-hole mounting is necessary.

Q: What is the impact of the LM224DR2G's extended operating temperature range?

A: The LM224DR2G operates from -25°C to 85°C, compared to the SC224NG's 0°C to 70°C range. This extended range provides additional thermal margin for applications operating in wider environmental conditions. However, circuit design must still be validated for the specific application temperature requirements.

Q: Can the LM224DR2G be used in applications requiring through-hole mounting?

A: No. The LM224DR2G is a surface-mount device (14-SOIC package). Through-hole mounting requires either the LF347BN/NOPB or LF347N, both available in 14-DIP packages.

Q: Are all substitute parts REACH compliant?

A: Yes. The SC224NG, LM224DR2G, LF347BN/NOPB, and LF347N all carry REACH Unaffected status, indicating compliance with REACH regulations.

Q: What is the significance of the MSL rating for these parts?

A: All parts listed carry MSL 1 (Unlimited) rating, indicating unlimited shelf life and no moisture sensitivity constraints. These parts do not require special moisture-controlled storage or handling procedures.