CS8321YDPR3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The CS8321YDPR3 is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 5V output at 150mA in a D2PAK-3 surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The regulator features integrated reverse polarity and short circuit protection, with a maximum input voltage of 45V and operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	CS8321YDPR3
Manufacturer	onsemi
Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	150mA
Input Voltage (Max)	45V
Voltage Dropout (Max)	0.5V @ 150mA
Package / Case	TO-263-4, D2PAK (3 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
Protection Features	Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitution for the CS8321YDPR3 is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current: Minimum 150mA (higher current ratings are acceptable for drop-in replacement)
Package / Case: TO-263-4 / D2PAK (3 Leads + Tab) physical compatibility
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 125°C minimum
Protection Features: Reverse polarity protection required

The substitute parts listed below meet or exceed these electrical and mechanical specifications, enabling direct replacement in existing PCB designs without layout modifications.

Parameter Comparison

Parameter	CS8321YDPR3	LP2954IS/NOPB	MIC29150-5.0WU	MIC29300-5.0WU	MIC2940A-5.0WU	TL750L05CKTTR
Manufacturer	onsemi	Texas Instruments	Microchip Technology	Microchip Technology	Microchip Technology	Texas Instruments
Output Voltage	5V	5V	5V	5V	5V	5V
Output Current	150mA	250mA	1.5A	3A	1.25A	150mA
Input Voltage (Max)	45V	30V	26V	26V	26V	26V
Voltage Dropout (Max)	0.5V @ 150mA	0.8V @ 250mA	0.6V @ 1.5A	0.6V @ 3A	0.6V @ 1.25A	0.6V @ 150mA
Package / Case	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Matched Current Rating):

TL750L05CKTTR and TL750L05CKTTRG3 are the closest functional equivalents, both delivering 150mA output current in the same TO-263 package. These Texas Instruments devices are active products with ROHS3 compliance and identical operating temperature range. Both are suitable for applications requiring the exact current specification of the original CS8321YDPR3.

Higher Current Capacity Alternatives:

MIC29150-5.0WU, MIC29300-5.0WU, MIC29300-5.0WU-TR, and MIC2940A-5.0WU provide increased output current (1.25A to 3A) while maintaining the same package footprint and 5V fixed output. These Microchip Technology devices are active products with ROHS3 compliance and are suitable for designs where higher current headroom is beneficial or required.

LP2954IS/NOPB from Texas Instruments offers 250mA output current, positioning it between the direct replacement and higher-capacity options. This device is active and ROHS3 compliant.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and active products, addressing the obsolescence of the original CS8321YDPR3. The original device is RoHS non-compliant, making migration to compliant alternatives necessary for new production and regulatory adherence.

Input Voltage Limitation:

The CS8321YDPR3 accepts input voltages up to 45V, while all substitute parts are rated for maximum 26V input. Applications requiring the higher input voltage specification cannot use these substitutes without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current-rated regulator as a direct replacement for the CS8321YDPR3?

A: Yes. Higher current-rated regulators (MIC29150-5.0WU, MIC29300-5.0WU, MIC2940A-5.0WU) are pin-compatible drop-in replacements in the same TO-263 package. The increased current capacity does not affect operation in circuits designed for 150mA or less.

Q: What is the key difference between TL750L05CKTTR and TL750L05CKTTRG3?

A: Both devices are functionally identical 150mA regulators. The difference is packaging: TL750L05CKTTR is supplied in Tape & Reel (TR), while TL750L05CKTTRG3 is also in Tape & Reel (TR) format. Selection depends on procurement and handling requirements.

Q: Why do substitute parts have lower maximum input voltage (26V vs. 45V)?

A: The CS8321YDPR3 is rated for 45V maximum input, while all listed substitutes are rated for 26V maximum. Applications operating above 26V input require alternative solutions or circuit modifications. Verify your input voltage specification before selection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance of the obsolete CS8321YDPR3. This compliance is mandatory for new production in regulated markets.

Q: What is the operating temperature range difference with TL750L05CKTTR?

A: TL750L05CKTTR operates from 0°C to 125°C, while the original CS8321YDPR3 operates from -40°C to 125°C. Applications requiring operation below 0°C must use alternative substitutes with the extended lower temperature range (MIC series, LP2954IS/NOPB, or MIC2940A series).

Q: Can I interchange MIC29300-5.0WU and MIC29300-5.0WU-TR?

A: Both are electrically identical 3A regulators in the same TO-263 package. The difference is packaging format: MIC29300-5.0WU is supplied in Tube, while MIC29300-5.0WU-TR is supplied in Cut Tape (CT) & Digi-Reel. Selection depends on procurement method and assembly requirements.

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