CS8221YDP3G Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The CS8221YDP3G is a linear voltage regulator IC manufactured by onsemi, delivering a fixed 5V output at 100mA in a D2PAK-3 (TO-263-3) surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The CS8221YDP3G provides positive fixed output regulation with integrated protection features including over-temperature, over-voltage, reverse polarity, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	CS8221YDP3G
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	26V
Dropout Voltage	0.6V @ 100mA
Quiescent Current	120 µA
PSRR	75dB (120Hz)
Package	D2PAK-3 (TO-263-3)
Operating Temperature	-40°C to 125°C
Protection Features	Over Temperature, Over Voltage, Reverse Polarity, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the CS8221YDP3G is determined by the following critical parameters:

Fixed 5V output voltage
D2PAK-3 (TO-263-3) package compatibility
Maximum input voltage of 26V
Operating temperature range of -40°C to 125°C
Dropout voltage specification of 0.6V

Substitute parts are grouped into two categories based on output current capability:

Category 1: Direct Current Replacement (100mA to 150mA) Parts in this category maintain output current specifications at or near the original 100mA rating, suitable for applications with equivalent power budgets.

Category 2: Higher Current Capability (1.25A and above) Parts in this category exceed the original 100mA specification, providing increased current capacity while maintaining all other electrical and mechanical compatibility parameters. These are suitable for designs requiring higher current delivery without package or voltage specification changes.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Package	Operating Temp	Product Status
CS8221YDP3G	onsemi	5V	100mA	26V	0.6V @ 100mA	D2PAK-3	-40°C to 125°C	Obsolete
TL750L05CKTTR	Texas Instruments	5V	150mA	26V	0.6V @ 150mA	TO-263 (DDPAK-3)	0°C to 125°C	Active
TL750L05CKTTRG3	Texas Instruments	5V	150mA	26V	0.6V @ 150mA	TO-263 (DDPAK-3)	0°C to 125°C	Active
TL750M05QKTTRQ1	Texas Instruments	5V	750mA	26V	0.6V @ 750mA	TO-263 (DDPAK-3)	-40°C to 125°C	Active
MIC2940A-5.0WU	Microchip Technology	5V	1.25A	26V	0.6V @ 1.25A	TO-263-3	-40°C to 125°C	Active
MIC2940A-5.0WU-TR	Microchip Technology	5V	1.25A	26V	0.6V @ 1.25A	TO-263-3	-40°C to 125°C	Active
MIC29150-5.0WU	Microchip Technology	5V	1.5A	26V	0.6V @ 1.5A	TO-263-3	-40°C to 125°C	Active
MIC29300-5.0WU	Microchip Technology	5V	3A	26V	0.6V @ 3A	TO-263-3	-40°C to 125°C	Active

Engineering Selection Recommendations

All substitute parts listed maintain electrical compatibility with the CS8221YDP3G through identical output voltage (5V), maximum input voltage (26V), and package form factor (D2PAK-3/TO-263-3). Selection among substitutes depends on application current requirements and compliance needs.

For applications requiring 100mA to 150mA output current: TL750L05CKTTR and TL750L05CKTTRG3 from Texas Instruments provide direct current-level compatibility. Both are active products with ROHS3 compliance. Operating temperature range is 0°C to 125°C, which covers standard industrial applications but does not extend to -40°C. These parts are suitable for designs operating within the 0°C to 125°C window.

For applications requiring full -40°C to 125°C temperature range with higher current capacity: TL750M05QKTTRQ1 (Texas Instruments, 750mA) maintains the full industrial temperature range and includes AEC-Q100 automotive qualification. MIC2940A-5.0WU, MIC2940A-5.0WU-TR (Microchip, 1.25A), MIC29150-5.0WU (Microchip, 1.5A), and MIC29300-5.0WU (Microchip, 3A) all support the complete -40°C to 125°C operating range with ROHS3 compliance. Selection among these higher-current options is determined by the specific current requirement of the application circuit.

All substitute parts are active products with current manufacturing support and compliance certifications (ROHS3, REACH Unaffected, EAR99).

Frequently Asked Questions (FAQ)

Q: Can I use a higher current-rated substitute like the MIC29300-5.0WU (3A) in place of the CS8221YDP3G (100mA)?

A: Yes. Higher current-rated regulators are electrically compatible substitutes. The regulator will deliver the current demanded by the load circuit, up to its rated maximum. No circuit modification is required. The higher current rating does not affect circuit operation at lower current levels.

Q: What is the difference between TL750L05CKTTR and TL750L05CKTTRG3?

A: Both parts are identical in electrical specifications and package. The difference is in packaging format and supplier designation. Both are active products suitable for production use.

Q: Why does the TL750L05CKTTR have a 0°C to 125°C operating range instead of -40°C to 125°C?

A: Operating temperature range is a device specification determined by the manufacturer. If your application requires operation below 0°C, select alternatives with -40°C to 125°C ratings such as TL750M05QKTTRQ1 or the Microchip MIC29xx series.

Q: Are MIC2940A-5.0WU and MIC2940A-5.0WU-TR interchangeable?

A: Yes. Both parts have identical electrical specifications. The difference is packaging format: MIC2940A-5.0WU is supplied in tube packaging, while MIC2940A-5.0WU-TR is supplied in tape and reel format. Selection depends on your procurement and assembly requirements.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. All active substitute parts listed are ROHS3 compliant, ensuring compatibility with modern manufacturing and environmental standards.

Q: Can I use the MIC29300-5.0WU (3A) in a design originally specified for 100mA?

A: Yes. The MIC29300-5.0WU is a direct substitute. The 3A rating is the maximum current the regulator can supply; it does not force additional current into the circuit. The circuit will draw only the current it requires, up to the regulator's rated maximum.

Q: Is the D2PAK-3 package the same as TO-263-3?

A: Yes. D2PAK-3 and TO-263-3 refer to the same physical package form factor. All substitute parts listed use this identical package, ensuring PCB footprint compatibility without layout modifications.

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