CS5203A-1GDPR3 Equivalent & Substitute Parts

Part Overview

The CS5203A-1GDPR3 is a linear voltage regulator IC from onsemi, classified as a positive adjustable output PMIC with 3A output current capability in a D2PAK-3 surface mount package. This device is currently obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity. The part delivers adjustable output voltage from 1.25V to 13V with integrated over-current and over-temperature protection features.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	CS5203A-1GDPR3
Product Status	Obsolete
Category	Power Management (PMIC)
Package Type	TO-263-4, D2PAK (3 Leads + Tab)
Output Configuration	Positive Adjustable
Output Current	3A
Output Voltage Range	1.25V to 13V
Input Voltage (Max)	17V
Voltage Dropout (Max)	1.15V @ 3A
Quiescent Current	6 mA
PSRR	85dB (120Hz)
Operating Temperature	0°C to 70°C
Protection Features	Over Current, Over Temperature
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CS5203A-1GDPR3 is determined by the following critical parameters:

Output configuration and type (positive adjustable)
Output current rating (3A minimum)
Package compatibility (TO-263-4 / D2PAK-3 form factor)
Output voltage range capability (minimum 1.25V, maximum ≥13V)
Protection features (over-current and over-temperature)
Surface mount mounting type

The four substitute parts listed below meet these core substitution criteria. Variations in input voltage maximum, dropout voltage, quiescent current, PSRR, and operating temperature range represent design improvements or different application suitability but do not prevent functional substitution in circuits designed for the CS5203A-1GDPR3 specifications.

Parameter Comparison

Parameter	CS5203A-1GDPR3	LM1085IS-ADJ/NOPB	LM1085ISX-ADJ/NOPB	LMS1587IS-ADJ/NOPB	LMS1587ISX-ADJ/NOPB
Manufacturer	onsemi	Texas Instruments	Texas Instruments	National Semiconductor	National Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable
Output Current	3A	3A	3A	3A	3A
Output Voltage Range	1.25V to 13V	1.25V to 15V	1.25V to 15V	1.25V to 11.7V	1.25V to 11.7V
Input Voltage (Max)	17V	29V	29V	13V	13V
Voltage Dropout (Max)	1.15V @ 3A	1.5V @ 3A	1.5V @ 3A	1.3V @ 3A	1.3V @ 3A
Quiescent Current	6 mA	10 mA	10 mA	7 mA	7 mA
PSRR (120Hz)	85dB	75dB	75dB	72dB	72dB
Operating Temperature	0°C to 70°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package Type	TO-263-4, D2PAK-3	TO-263-4, D2PAK-3	TO-263-4, D2PAK-3	TO-263-4, D2PAK-3	TO-263-4, D2PAK-3
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified

Engineering Selection Recommendations

Primary Substitutes (Texas Instruments LM1085 Series)

The LM1085IS-ADJ/NOPB and LM1085ISX-ADJ/NOPB from Texas Instruments are active products with ROHS3 compliance. Both devices support the full 3A output current and adjustable output voltage range required by the CS5203A-1GDPR3. The LM1085ISX-ADJ/NOPB variant offers superior inventory availability (16,800 units) and is supplied in Cut Tape and Digi-Reel packaging, making it suitable for high-volume production environments. The LM1085IS-ADJ/NOPB is supplied in Tube packaging. Both variants feature extended operating temperature range (-40°C to 125°C) and higher maximum input voltage (29V) compared to the original part, providing greater design flexibility.

Secondary Substitutes (National Semiconductor LMS1587 Series)

The LMS1587IS-ADJ/NOPB and LMS1587ISX-ADJ/NOPB from National Semiconductor are active products with comparable performance characteristics. These devices maintain the 3A output current and adjustable output voltage capability. The LMS1587 series exhibits lower quiescent current (7 mA versus 10 mA in the LM1085) and reduced dropout voltage (1.3V versus 1.5V), offering improved efficiency in power-constrained applications. Maximum input voltage is limited to 13V, matching the original CS5203A-1GDPR3 specification. The LMS1587ISX-ADJ/NOPB variant provides higher inventory availability (1,638 units) in Bulk packaging.

Compliance Considerations

The CS5203A-1GDPR3 is RoHS non-compliant. If RoHS3 compliance is required for new designs or production, the Texas Instruments LM1085 series substitutes provide certified compliance. The National Semiconductor LMS1587 series RoHS status is not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can the LM1085 series directly replace the CS5203A-1GDPR3 without circuit modifications?

A: Yes, for circuits operating within the CS5203A-1GDPR3 specifications. Both the LM1085IS-ADJ/NOPB and LM1085ISX-ADJ/NOPB share identical pinout, package form factor (TO-263-4 D2PAK-3), and functional output characteristics (positive adjustable, 3A, 1.25V to 15V range). The extended input voltage rating (29V versus 17V) and wider operating temperature range (-40°C to 125°C versus 0°C to 70°C) represent design improvements that do not require circuit changes.

Q: What are the key differences between LM1085IS-ADJ/NOPB and LM1085ISX-ADJ/NOPB?

A: Both variants are functionally identical with matching electrical specifications. The primary difference is packaging format: LM1085IS-ADJ/NOPB is supplied in Tube packaging, while LM1085ISX-ADJ/NOPB is supplied in Cut Tape and Digi-Reel format. The LM1085ISX variant has significantly higher inventory availability (16,800 units versus 1,151 units) and is preferred for production environments requiring reel-based component handling.

Q: How do the LMS1587 series devices compare to the LM1085 series for substitution?

A: Both series meet the core substitution criteria for the CS5203A-1GDPR3. The LMS1587 series offers lower quiescent current (7 mA) and reduced dropout voltage (1.3V @ 3A) compared to the LM1085 series (10 mA and 1.5V respectively), resulting in improved power efficiency. However, the LMS1587 series is limited to 13V maximum input voltage, matching the original part's 17V specification less favorably than the LM1085's 29V rating. The LM1085 series is recommended for applications requiring higher input voltage headroom.

Q: Are there any thermal or reliability differences between these substitute parts?

A: The LM1085 series supports extended operating temperature range (-40°C to 125°C) compared to the CS5203A-1GDPR3 (0°C to 70°C), providing greater thermal margin and reliability in temperature-variable environments. All substitute parts include integrated over-current and over-temperature protection. The LMS1587 series also supports the extended temperature range (-40°C to 125°C).

Q: What packaging considerations apply when substituting these parts?

A: All substitute parts use the identical TO-263-4 D2PAK-3 surface mount package as the CS5203A-1GDPR3, ensuring PCB layout and thermal management compatibility without modification. Packaging format differences (Tube, Cut Tape, Digi-Reel, Bulk) affect supply chain and assembly processes but not electrical or mechanical compatibility.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring RoHS3 compliance, the LM1085ISX-ADJ/NOPB is the recommended choice, offering active product status, high inventory availability, extended specifications, and certified compliance. For applications prioritizing power efficiency, the LMS1587ISX-ADJ/NOPB provides lower quiescent current and dropout voltage, though RoHS compliance status should be verified with the supplier.

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