CS9201YDFR8 Equivalent & Substitute Parts

Part Overview

The CS9201YDFR8 is a linear voltage regulator IC manufactured by onsemi, designed to deliver a fixed 5V output at 100mA in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The part provides protection features including over temperature, over voltage, reverse polarity, and short circuit protection, making it suitable for low-power 5V regulation applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CS9201YDFR8
Manufacturer	onsemi
Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	36V
Voltage Dropout (Max)	0.6V @ 100mA
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature Range	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the CS9201YDFR8 is determined by the following critical parameters:

Output Voltage: Fixed 5V output is mandatory
Output Current Capability: Minimum 100mA required for direct replacement
Package Type: 8-SOIC form factor for PCB compatibility
Input Voltage Range: Must accommodate the application's input voltage requirements
Operating Temperature: Must support the required temperature range
Mounting Type: Surface mount configuration

The substitute parts identified are grouped into two categories based on output current capability:

Category 1 - Direct Current Replacement (100mA Output) Parts with 100mA output current matching the original specification: LM2931AM-5.0/NOPB, LM2931AMX-5.0/NOPB, LM2931M-5.0/NOPB, and LM2931MX-5.0/NOPB (all Texas Instruments).

Category 2 - Higher Current Capability (250mA Output) Part with enhanced output current: L4931ABD50-TR (STMicroelectronics) provides 250mA output, suitable for applications requiring higher current capacity while maintaining 5V fixed output and 8-SOIC packaging.

Parameter Comparison

Parameter	CS9201YDFR8	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
Output Voltage (Fixed)	5V	5V	5V	5V	5V	5V
Output Current	100mA	250mA	100mA	100mA	100mA	100mA
Input Voltage (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
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Specification Match (100mA Output, Active Status)

The LM2931 series from Texas Instruments provides the most direct substitution path. All four variants (LM2931AM-5.0/NOPB, LM2931AMX-5.0/NOPB, LM2931M-5.0/NOPB, LM2931MX-5.0/NOPB) are active products with ROHS3 compliance. The primary difference between variants is packaging format (tube vs. cut tape) and quiescent current specifications. These parts are pin-compatible with the CS9201YDFR8 in 8-SOIC configuration.

For Higher Current Applications (250mA Output)

The L4931ABD50-TR from STMicroelectronics offers 250mA output capability while maintaining 5V fixed output and 8-SOIC packaging. This part is suitable for applications requiring higher current capacity. Note that the maximum input voltage is limited to 20V compared to the original 36V specification.

Compliance Considerations

All substitute parts are ROHS3 compliant and REACH unaffected, addressing modern regulatory requirements. The original CS9201YDFR8 is RoHS non-compliant, making active substitutes necessary for new designs subject to RoHS regulations.

Temperature Range Consideration

The original CS9201YDFR8 supports -40°C to 125°C operation. The LM2931 series supports -40°C to 85°C. Applications requiring operation above 85°C must evaluate the L4931ABD50-TR, which supports -40°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can the LM2931 series directly replace the CS9201YDFR8?

A: Yes, the LM2931 series (all four variants) provides direct replacement for 100mA applications. All parts share identical 5V output, 100mA current rating, and 8-SOIC packaging. Pin compatibility is maintained across these devices.

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

A: 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 with digi-reel format. Electrical specifications are identical.

Q: What is the difference between LM2931M-5.0/NOPB and LM2931MX-5.0/NOPB?

A: These variants differ in quiescent current (Iq) specification and packaging format. LM2931M-5.0/NOPB specifies 1mA Iq and is supplied in tube, while LM2931MX-5.0/NOPB also specifies 1mA Iq and is supplied in cut tape. Both have identical electrical performance.

Q: When should I use the L4931ABD50-TR instead of the LM2931 series?

A: Use the L4931ABD50-TR when your application requires output current greater than 100mA but not exceeding 250mA. This part provides higher current capacity while maintaining 5V output and 8-SOIC packaging. Verify that your input voltage does not exceed 20V, as this is the maximum rating for the L4931ABD50-TR.

Q: Are all substitute parts RoHS compliant?

A: Yes, all identified substitute parts are ROHS3 compliant. The original CS9201YDFR8 is RoHS non-compliant, making substitution necessary for applications subject to RoHS regulations.

Q: What is the maximum input voltage for each substitute part?

A: LM2931 series parts support up to 26V input, while L4931ABD50-TR supports up to 20V. The original CS9201YDFR8 supports 36V. Applications requiring input voltages above 26V cannot use the identified substitutes.

Q: Do all parts use the same 8-SOIC package?

A: Yes, all substitute parts use the 8-SOIC (0.154", 3.90mm width) package, ensuring PCB layout compatibility with the original CS9201YDFR8.

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