CS9201YDF8G Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The CS9201YDF8G is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed 5V output at 100mA in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers positive fixed output regulation with integrated protection features including over-temperature, over-voltage, reverse polarity, and short-circuit protection.

Substiute Parts

CS9201YDF8G

onsemiIn Stock: 1163CS9201YDF8G Datasheet

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L4931ABD50-TR

STMicroelectronicsIn Stock: 28787L4931ABD50-TR Datasheet

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LM2931AM-5.0/NOPB

Texas InstrumentsIn Stock: 338251LM2931AM-5.0/NOPB Datasheet

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LM2931AMX-5.0/NOPB

Texas InstrumentsIn Stock: 2849LM2931AMX-5.0/NOPB Datasheet

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LM2931M-5.0/NOPB

Texas InstrumentsIn Stock: 8472LM2931M-5.0/NOPB Datasheet

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LM2931MX-5.0/NOPB

Texas InstrumentsIn Stock: 10275LM2931MX-5.0/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS9201YDF8G is determined by the following critical parameters:

Primary Substitution Criteria:

• Fixed output voltage of 5V
• Output current capability of 100mA or greater
• 8-SOIC package form factor (0.154", 3.90mm Width)
• Surface mount technology
• Operating temperature range compatibility (-40°C minimum to 85°C or higher)
• Positive fixed output configuration

Secondary Compatibility Factors:

• Input voltage rating (minimum 26V acceptable; CS9201YDF8G rated to 36V)
• Voltage dropout characteristics
• Protection feature set (over-temperature and short-circuit protection required)
• RoHS and REACH compliance status

The substitute parts identified below meet these criteria with active product status and verified inventory availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM2931MX-5.0/NOPB or LM2931M-5.0/NOPB (Texas Instruments)

These parts provide direct functional equivalence to the CS9201YDF8G with active product status and ROHS3 compliance. Both deliver 100mA output current at 5V with superior voltage dropout performance (0.3V vs. 0.6V). The LM2931MX-5.0/NOPB is available in Cut Tape & Digi-Reel packaging with 10,201 units in stock, while the LM2931M-5.0/NOPB is supplied in Tube packaging with 8,400 units available. Both operate across the -40°C to 85°C temperature range and include over-temperature, reverse polarity, and short-circuit protection.

Secondary Recommendation: LM2931AM-5.0/NOPB (Texas Instruments)

This variant offers identical electrical specifications to the primary recommendation with 338,200 units in stock, providing superior supply availability. Tube packaging is standard. ROHS3 compliance and active product status are confirmed.

Alternative for Higher Current Applications: L4931ABD50-TR (STMicroelectronics)

This part supports 250mA output current, exceeding the 100mA requirement of the original CS9201YDF8G. It maintains 5V fixed output, 8-SOIC package compatibility, and -40°C to 125°C operating range. Input voltage rating is limited to 20V maximum. Over-current and over-temperature protection are provided. ROHS3 compliance is confirmed with 28,705 units in stock.

All substitute parts maintain identical 8-SOIC package geometry and surface mount technology, ensuring direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the L4931ABD50-TR be used as a direct replacement for the CS9201YDF8G?

A: The L4931ABD50-TR is electrically compatible for applications requiring 100mA or less output current. However, the input voltage rating is reduced to 20V maximum compared to the CS9201YDF8G's 36V rating. If your application requires input voltages above 20V, the Texas Instruments LM2931 series is required.

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

A: Both parts are electrically identical with matching specifications. The primary difference is packaging: LM2931MX-5.0/NOPB is supplied in Cut Tape & Digi-Reel format suitable for automated assembly, while LM2931M-5.0/NOPB is supplied in Tube format. Select based on your assembly process requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance certification. The original CS9201YDF8G does not specify RoHS status due to its obsolete classification.

Q: Will the substitute parts work in the same PCB footprint?

A: Yes. All substitute parts use the 8-SOIC package with identical 0.154" (3.90mm) width and pin configuration, ensuring direct PCB compatibility without layout modifications.

Q: What protection features do the substitute parts provide?

A: The LM2931 series (all variants) provides over-temperature, reverse polarity, and short-circuit protection. The L4931ABD50-TR provides over-current and over-temperature protection. All meet or exceed the protection feature set of the original CS9201YDF8G.

Q: Is the operating temperature range a limiting factor for substitution?

A: The CS9201YDF8G operates to 125°C maximum, while the LM2931 series operates to 85°C maximum. For applications requiring operation above 85°C, the L4931ABD50-TR supports the full -40°C to 125°C range. Verify your application's maximum operating temperature requirement before selection.

Q: Which substitute part has the best voltage dropout performance?

A: The LM2931 series (all variants) delivers 0.3V dropout at 100mA, compared to 0.6V for the CS9201YDF8G and 0.8V for the L4931ABD50-TR. Lower dropout voltage reduces power dissipation and heat generation in current-limited applications.