CS9201YDF8 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The CS9201YDF8 is a linear voltage regulator IC manufactured by onsemi, designed to deliver a fixed 5V output at 100mA with integrated protection features including over-temperature, over-voltage, reverse polarity, and short-circuit protection. The device operates across an input voltage range up to 36V with a maximum dropout voltage of 0.6V at full load current.

The CS9201YDF8 is classified as obsolete. Equivalent substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. The substitute parts listed maintain functional compatibility while offering improved specifications and active product status from Texas Instruments.

Key Parameters

Parameter	CS9201YDF8
Manufacturer	onsemi
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	36V
Dropout Voltage (Max)	0.6V @ 100mA
Package	8-SOIC (0.154", 3.90mm Width)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Temperature, Over Voltage, Reverse Polarity, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the CS9201YDF8 is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 100mA minimum
8-SOIC surface mount package with 3.90mm width
Positive output configuration with fixed regulation
Protection against over-temperature, reverse polarity, and short-circuit conditions
Operating temperature range compatibility

All four substitute parts from Texas Instruments meet these core requirements. The LM2931 series variants (LM2931AM-5.0/NOPB, LM2931AMX-5.0/NOPB, LM2931M-5.0/NOPB, and LM2931MX-5.0/NOPB) are functionally equivalent linear voltage regulators with identical output specifications and package configuration. Differences exist in quiescent current consumption, PSRR performance, and maximum input voltage rating, which may influence selection based on specific application requirements.

Parameter Comparison

Parameter	CS9201YDF8	LM2931AM-5.0/NOPB	LM2931AMX-5.0/NOPB	LM2931M-5.0/NOPB	LM2931MX-5.0/NOPB
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	5V	5V	5V	5V	5V
Output Current	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	36V	26V	26V	26V	26V
Dropout Voltage (Max)	0.6V @ 100mA	0.3V @ 100mA	0.3V @ 100mA	0.3V @ 100mA	0.3V @ 100mA
Quiescent Current (Iq)	750 µA	15 mA	15 mA	1 mA	1 mA
PSRR (120Hz)	75dB	80dB	80dB	55dB	55dB
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Operating Temperature	-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
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four LM2931 variants from Texas Instruments are active products with ROHS3 compliance, providing regulatory advantage over the obsolete CS9201YDF8. Selection among the substitute options should be based on specific application constraints:

LM2931M-5.0/NOPB and LM2931MX-5.0/NOPB offer superior quiescent current performance at 1 mA, compared to 750 µA in the original part, making them suitable for battery-powered or low-power standby applications. The primary difference between these two variants is packaging format: LM2931M-5.0/NOPB is supplied in Tube packaging, while LM2931MX-5.0/NOPB is supplied in Cut Tape (CT) & Digi-Reel format.

LM2931AM-5.0/NOPB and LM2931AMX-5.0/NOPB provide higher quiescent current at 15 mA but deliver improved PSRR performance at 80dB, beneficial for noise-sensitive analog circuits. These variants also differ in packaging: LM2931AM-5.0/NOPB in Tube format and LM2931AMX-5.0/NOPB in Cut Tape & Digi-Reel format.

All substitute parts operate at reduced maximum input voltage (26V versus 36V). Applications requiring input voltages exceeding 26V are not suitable for direct substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the LM2931 series directly replace the CS9201YDF8 without circuit modifications?

A: Direct pin-compatible substitution is possible due to identical 8-SOIC package configuration and matching output voltage/current specifications. However, the reduced maximum input voltage rating (26V versus 36V) requires verification that your application input does not exceed 26V. If input voltage exceeds 26V, circuit redesign is necessary.

Q: What is the difference between LM2931M-5.0/NOPB and LM2931AM-5.0/NOPB?

A: Both are functionally equivalent 5V/100mA regulators in 8-SOIC packages. The primary differences are quiescent current (1 mA for M-variant versus 15 mA for A-variant) and PSRR performance (55dB for M-variant versus 80dB for A-variant). Select the M-variant for low-power applications and the A-variant for noise-sensitive circuits.

Q: What is the difference between the /NOPB and MX variants?

A: The /NOPB designation indicates Tube packaging, while the MX designation indicates Cut Tape (CT) & Digi-Reel packaging. Both variants are electrically identical. Selection depends on your procurement and assembly process requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes, all four LM2931 variants are ROHS3 compliant, whereas the original CS9201YDF8 is non-compliant. This provides regulatory advantage for new designs and production runs.

Q: What is the operating temperature difference between the original and substitute parts?

A: The CS9201YDF8 operates from -40°C to 125°C, while all LM2931 variants operate from -40°C to 85°C. Applications requiring operation above 85°C are not suitable for substitution.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message