CS8321YT3G Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The CS8321YT3G is a linear voltage regulator IC manufactured by onsemi, designed to deliver a fixed 5V output at 150mA in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The CS8321YT3G provides basic voltage regulation with reverse polarity and short circuit protection, suitable for low-current applications requiring a compact through-hole solution.

Key Parameters

Parameter	CS8321YT3G
Manufacturer	onsemi
Output Voltage (Fixed)	5V
Output Current	150mA
Input Voltage (Max)	45V
Voltage Dropout (Max)	0.5V @ 150mA
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CS8321YT3G are selected based on the following critical parameters:

Output Voltage: All substitutes must provide fixed 5V output
Package / Case: All substitutes must use TO-220-3 through-hole package for direct PCB compatibility
Output Current Capability: Substitutes must meet or exceed 150mA minimum requirement
Input Voltage Range: Substitutes must accommodate the application's input voltage requirements
Operating Temperature Range: Substitutes must support -40°C ~ 125°C minimum
Product Status: Active status substitutes ensure long-term availability and support

Substitutes are grouped by output current capability, as this determines suitability for the CS8321YT3G's 150mA application. All listed substitutes maintain TO-220-3 package compatibility and 5V fixed output configuration.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Package	Operating Temp	Product Status	RoHS Status
CS8321YT3G	onsemi	150mA	45V	0.5V @ 150mA	TO-220-3	-40°C ~ 125°C	Obsolete	Not Specified
MIC2954-02WT	Microchip Technology	250mA	30V	0.6V @ 250mA	TO-220-3	-40°C ~ 125°C	Active	ROHS3 Compliant
MIC2937A-5.0WT	Microchip Technology	750mA	26V	Not Specified	TO-220-3	-40°C ~ 125°C	Active	ROHS3 Compliant
TL750M05CKCSE3	Texas Instruments	750mA	26V	0.6V @ 750mA	TO-220-3	0°C ~ 125°C	Active	ROHS3 Compliant
LM2940T-5.0/LF08	Texas Instruments	1A	26V	1V @ 1A	TO-220-3	-40°C ~ 125°C	Active	ROHS3 Compliant
MIC29150-5.0WT	Microchip Technology	1.5A	26V	0.6V @ 1.5A	TO-220-3	-40°C ~ 125°C	Active	ROHS3 Compliant
L4940V5	STMicroelectronics	1.5A	17V	0.9V @ 1.5A	TO-220-3	-40°C ~ 150°C	Active	ROHS3 Compliant
MIC29300-5.0WT	Microchip Technology	3A	26V	0.6V @ 3A	TO-220-3	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, ensuring regulatory compliance and long-term supply availability. The CS8321YT3G's obsolete status necessitates migration to active alternatives.

Direct Replacement (Minimum Current Requirement Met):

MIC2954-02WT provides the closest current rating at 250mA with identical operating temperature range and active product status.

Higher Current Capacity Substitutes (Recommended for New Designs):

MIC2937A-5.0WT and TL750M05CKCSE3 offer 750mA capacity with improved thermal performance and enhanced protection features.
LM2940T-5.0/LF08, MIC29150-5.0WT, and L4940V5 provide 1A to 1.5A capacity for applications requiring additional current headroom.
MIC29300-5.0WT delivers 3A output for high-current applications.

All substitutes maintain TO-220-3 package compatibility for direct PCB mounting. Input voltage ratings vary; verify application requirements against substitute specifications. L4940V5 operates to 150°C, providing extended temperature capability compared to the CS8321YT3G's 125°C maximum.

Frequently Asked Questions (FAQ)

Q: Can I directly replace CS8321YT3G with any of these substitutes? A: Yes, all listed substitutes use the TO-220-3 package and provide fixed 5V output. Pin compatibility is maintained. However, verify your application's input voltage and current requirements against each substitute's specifications.

Q: What is the minimum substitute I should use? A: MIC2954-02WT meets the 150mA requirement with 250mA capacity and identical temperature range. For new designs, higher-capacity options provide better thermal margin and longer component life.

Q: Does input voltage rating matter for my application? A: Yes. The CS8321YT3G accepts up to 45V input. Most substitutes limit input to 17V–30V. Verify your application's input voltage does not exceed the substitute's maximum rating. L4940V5 is limited to 17V maximum input.

Q: Are all substitutes RoHS compliant? A: All listed active substitutes are ROHS3 compliant. The CS8321YT3G's RoHS status is not specified due to its obsolete classification.

Q: What is the difference between dropout voltage specifications? A: Dropout voltage determines the minimum voltage difference required between input and output for proper regulation. Lower dropout voltage allows operation with lower input voltages. MIC29150-5.0WT and MIC29300-5.0WT offer 0.6V dropout, superior to the CS8321YT3G's 0.5V at comparable current levels.

Q: Can I use a higher-current substitute in a 150mA application? A: Yes. Higher-current regulators operate safely at lower currents. They provide improved thermal performance and protection features. No circuit modifications are required for direct package-compatible substitutes.

Q: What protection features should I consider? A: All substitutes include over-temperature and reverse polarity protection. MIC2954-02WT adds load dump and UV power-on reset protection. MIC29150-5.0WT and MIC29300-5.0WT include transient voltage protection. Select based on your application's environmental requirements.

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