CS8321YDP3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The CS8321YDP3 is a linear voltage regulator IC from onsemi, rated for positive fixed 5V output at 150mA in a D2PAK-3 (TO-263-3) surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The device provides reverse polarity and short circuit protection across an operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	CS8321YDP3
Output Voltage (Fixed)	5V
Output Current	150mA
Input Voltage (Max)	45V
Dropout Voltage	0.5V @ 150mA
Quiescent Current	200 µA
Package	TO-263-3 (D2PAK-3)
Operating Temperature	-40°C to 125°C
Protection Features	Reverse Polarity, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CS8321YDP3 is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Package: Must be TO-263-3 (D2PAK-3) surface mount
Output Current Rating: Must meet or exceed 150mA
Input Voltage Range: Must accommodate up to 45V maximum input
Operating Temperature: Must span -40°C to 125°C
Protection Features: Must include reverse polarity protection

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

Category A - Direct Current Match (150mA): Parts with 150mA output current rating provide pin-for-pin compatibility with identical thermal and electrical characteristics.

Category B - Higher Current Capability (250mA to 3A): Parts exceeding 150mA output current are functionally compatible and can replace the CS8321YDP3 in applications where higher current headroom is beneficial. These parts maintain the same package, voltage output, and operating temperature range.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Operating Temp	Product Status	RoHS Compliance
CS8321YDP3	onsemi	150mA	45V	0.5V @ 150mA	200 µA	TO-263-3	-40°C to 125°C	Obsolete	Non-compliant
TL750L05CKTTR	Texas Instruments	150mA	26V	0.6V @ 150mA	2 mA	TO-263-3	0°C to 125°C	Active	ROHS3 Compliant
TL750L05CKTTRG3	Texas Instruments	150mA	26V	0.6V @ 150mA	2 mA	TO-263-3	0°C to 125°C	Active	ROHS3 Compliant
LP2954IS/NOPB	Texas Instruments	250mA	30V	0.8V @ 250mA	150 µA	TO-263-3	-40°C to 125°C	Active	ROHS3 Compliant
MIC2940A-5.0WU	Microchip Technology	1.25A	26V	0.6V @ 1.25A	500 µA	TO-263-3	-40°C to 125°C	Active	ROHS3 Compliant
MIC2940A-5.0WU-TR	Microchip Technology	1.25A	26V	0.6V @ 1.25A	500 µA	TO-263-3	-40°C to 125°C	Active	ROHS3 Compliant
MIC29150-5.0WU	Microchip Technology	1.5A	26V	0.6V @ 1.5A	—	TO-263-3	-40°C to 125°C	Active	ROHS3 Compliant
MIC29300-5.0WU	Microchip Technology	3A	26V	0.6V @ 3A	—	TO-263-3	-40°C to 125°C	Active	ROHS3 Compliant
MIC29300-5.0WU-TR	Microchip Technology	3A	26V	0.6V @ 3A	—	TO-263-3	-40°C to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (150mA Output Current)

The TL750L05CKTTR and TL750L05CKTTRG3 from Texas Instruments provide exact current rating matching with the CS8321YDP3. Both are active products with ROHS3 compliance. The primary design consideration is the reduced maximum input voltage (26V versus 45V) and narrower operating temperature range (0°C to 125°C versus -40°C to 125°C). These parts are suitable for applications where input voltage does not exceed 26V and minimum operating temperature is 0°C or higher.

For Higher Current Capability Applications

The LP2954IS/NOPB (250mA), MIC2940A-5.0WU series (1.25A), MIC29150-5.0WU (1.5A), and MIC29300-5.0WU series (3A) all provide superior current handling while maintaining the same 5V output, TO-263-3 package, and -40°C to 125°C operating temperature range. All substitute parts are active products with ROHS3 compliance. Input voltage maximum ranges from 26V to 30V, which is lower than the original 45V specification. Selection depends on required output current and maximum input voltage constraints of the application.

Packaging Considerations

All substitute parts are available in TO-263-3 (D2PAK-3) surface mount package. Tape & Reel (TR) packaging variants (TL750L05CKTTR, MIC2940A-5.0WU-TR, MIC29300-5.0WU-TR) are suitable for automated assembly. Tube packaging variants (LP2954IS/NOPB, MIC2940A-5.0WU, MIC29150-5.0WU, MIC29300-5.0WU) are available for lower-volume applications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher output current rating than 150mA?

A: Yes. Parts rated for 250mA, 1.25A, 1.5A, or 3A output current are functionally compatible with the CS8321YDP3. Higher current ratings provide additional design margin and do not negatively impact applications requiring 150mA or less. The substitute part will not supply more current than the application circuit demands.

Q: What is the impact of reduced maximum input voltage on substitute parts?

A: Most substitute parts specify 26V to 30V maximum input voltage compared to the CS8321YDP3 at 45V. If your application requires input voltages exceeding 30V, verify the specific substitute part's maximum rating. For applications with input voltages at or below 26V, all listed substitutes are compatible.

Q: Are the substitute parts pin-compatible with the CS8321YDP3?

A: Yes. All substitute parts use the TO-263-3 (D2PAK-3) package with identical pinout: input, ground, and output. No PCB layout modifications are required for substitution.

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

A: Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly in high-volume production. Tube packaging is suitable for manual assembly and lower-volume applications. Electrical and thermal performance are identical between packaging variants of the same part number.

Q: Does the CS8321YDP3 obsolescence affect long-term availability of substitute parts?

A: All listed substitute parts are classified as active products from established manufacturers (Texas Instruments and Microchip Technology). Active product status indicates ongoing manufacturing and long-term availability. Inventory levels for substitute parts range from 1,000 to over 1,000,000 units, supporting both immediate and future production requirements.

Q: Which substitute part should I select for new designs?

A: For new designs, select based on required output current and maximum input voltage. If 150mA output is sufficient and input voltage does not exceed 26V, the TL750L05CKTTR series provides direct current matching. For applications requiring higher current headroom or if input voltage may approach 45V in future revisions, the MIC29300-5.0WU series (3A) offers maximum flexibility while maintaining active product status and ROHS3 compliance.

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