CS9201YDFR8G Equivalent & Substitute Parts

Part Overview

The CS9201YDFR8G is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed 5V positive output at 100mA. This device is classified as a Power Management (PMIC) component and is packaged in an 8-SOIC surface mount configuration. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	CS9201YDFR8G
Manufacturer	onsemi
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Current - Output	100mA
Voltage - Input (Max)	36V
Voltage Dropout (Max)	0.6V @ 100mA
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Temperature, Over Voltage, Reverse Polarity, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CS9201YDFR8G are selected based on the following critical parameters:

Primary Matching Criteria:

Fixed 5V positive output voltage
8-SOIC surface mount package (0.154", 3.90mm Width)
Output current capability of 100mA or greater
Operating temperature range of -40°C to 85°C minimum
Positive output configuration

Secondary Compatibility Factors:

Input voltage rating (minimum 26V to 36V)
Dropout voltage performance
Protection features (Over Temperature, Reverse Polarity, Short Circuit)
Active product status for long-term availability

The substitute parts identified maintain functional equivalence within the specified electrical and mechanical constraints of this product category.

Parameter Comparison

Parameter	CS9201YDFR8G	L4931ABD50-TR	LM2931AM-5.0/NOPB	LM2931AMX-5.0/NOPB	LM2931M-5.0/NOPB	LM2931MX-5.0/NOPB
Manufacturer	onsemi	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Output Voltage	5V	5V	5V	5V	5V	5V
Current - Output	100mA	250mA	100mA	100mA	100mA	100mA
Voltage - Input (Max)	36V	20V	26V	26V	26V	26V
Voltage Dropout (Max)	0.6V @ 100mA	0.8V @ 250mA	0.3V @ 100mA	0.3V @ 100mA	0.3V @ 100mA	0.3V @ 100mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The LM2931 series from Texas Instruments (LM2931AM-5.0/NOPB, LM2931AMX-5.0/NOPB, LM2931M-5.0/NOPB, LM2931MX-5.0/NOPB) provides direct functional equivalence to the CS9201YDFR8G. All variants maintain the 5V fixed output, 100mA current rating, and 8-SOIC package. These parts are in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The primary distinction between LM2931 variants is packaging format (Tube vs. Cut Tape) and quiescent current specifications.

Secondary Substitute (Higher Current Capability):

The L4931ABD50-TR from STMicroelectronics offers 250mA output current, exceeding the 100mA requirement of the original part. This device maintains 5V fixed output and 8-SOIC packaging with extended operating temperature range (-40°C to 125°C). The higher current rating provides design margin for applications requiring increased load capacity. Input voltage rating is limited to 20V maximum, which is lower than the original 36V specification.

Compliance Considerations:

All identified substitute parts carry ROHS3 compliance certification and REACH unaffected status, meeting current environmental and regulatory requirements. The transition from the obsolete CS9201YDFR8G to any active substitute ensures compliance with modern procurement and manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the LM2931 series directly replace the CS9201YDFR8G without circuit modifications?

A: The LM2931 series maintains identical output voltage (5V), current rating (100mA), and 8-SOIC package configuration. Pin-to-pin compatibility exists for standard linear regulator applications. However, input voltage rating differences (26V maximum for LM2931 vs. 36V for CS9201YDFR8G) must be evaluated for specific circuit designs operating at higher input voltages.

Q: What is the difference between LM2931AM-5.0/NOPB and LM2931AMX-5.0/NOPB?

A: Both parts are functionally identical with 5V output and 100mA current rating. The primary difference is packaging format: LM2931AM-5.0/NOPB is supplied in Tube packaging, while LM2931AMX-5.0/NOPB is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on production volume and assembly line requirements.

Q: Why does the L4931ABD50-TR have a higher current rating than the original part?

A: The L4931ABD50-TR is rated for 250mA output current compared to the 100mA specification of the CS9201YDFR8G. This higher rating provides additional design margin and allows the device to support applications with increased load requirements while maintaining the same 5V output voltage and 8-SOIC package footprint.

Q: Are there temperature range limitations when substituting the CS9201YDFR8G?

A: The LM2931 series operates from -40°C to 85°C, which is narrower than the original CS9201YDFR8G range of -40°C to 125°C. Applications requiring operation above 85°C must use the L4931ABD50-TR, which supports -40°C to 125°C. This is a critical consideration for high-temperature environments.

Q: What input voltage limitations apply to substitute parts?

A: The CS9201YDFR8G accepts input voltages up to 36V. The LM2931 series limits input to 26V maximum, while the L4931ABD50-TR limits input to 20V maximum. Circuit designs operating with input voltages between 26V and 36V require the L4931ABD50-TR or retention of the original part if available.

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