MIC2954-03BT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC2954-03BT is a linear voltage regulator IC from Microchip Technology designed for positive fixed 5V output at 250mA in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MIC2954-03BT provides essential power management functionality with integrated protection features including load dump, over-current, over-temperature, reverse polarity, and UV power-on reset protection across an operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC2954-03BT
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Voltage (Fixed)	5V
Output Current	250mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.6V @ 250mA
Quiescent Current	300 µA
Operating Temperature	-40°C to 125°C
Protection Features	Load Dump, Over Current, Over Temperature, Reverse Polarity, UV POR
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the MIC2954-03BT is determined by the following critical parameters: fixed 5V output voltage, TO-220-3 package configuration, positive output configuration, and through-hole mounting type. The primary substitution candidates are evaluated based on electrical compatibility within these constraints.

The MIC2954-03WT represents a direct equivalent from the same manufacturer, maintaining identical electrical specifications while offering improved compliance status. The Texas Instruments LM2930T-5.0/NOPB and LM2940T-5.0/LF08 are manufacturer-recommended alternatives that preserve the 5V fixed output and TO-220-3 package but introduce variations in output current capacity and maximum input voltage ratings.

Key parameters determining substitution eligibility:

Fixed output voltage: 5V
Package type: TO-220-3
Output configuration: Positive
Mounting type: Through Hole
Protection feature set compatibility

Parameter Comparison

Parameter	MIC2954-03BT	MIC2954-03WT	LM2930T-5.0/NOPB	LM2940T-5.0/LF08
Manufacturer	Microchip Technology	Microchip Technology	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	5V	5V	5V	5V
Output Current	250mA	250mA	150mA	1A
Input Voltage (Max)	30V	30V	26V	26V
Voltage Dropout (Max)	0.6V @ 250mA	0.6V @ 250mA	0.6V @ 150mA	1V @ 1A
Quiescent Current	300 µA	300 µA	7 mA	10 mA
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3 Formed Leads
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 85°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MIC2954-03WT is the primary direct substitute for the MIC2954-03BT, offering identical electrical performance with active product status and ROHS3 compliance. This part maintains the same manufacturer lineage, output current rating of 250mA, and operating temperature range, making it the optimal choice for direct replacement in existing designs.

The LM2930T-5.0/NOPB from Texas Instruments is suitable for applications where output current requirements do not exceed 150mA. This part is active and ROHS3 compliant but operates within a reduced temperature range of -40°C to 85°C and has a lower maximum input voltage of 26V compared to the original specification of 30V.

The LM2940T-5.0/LF08 from Texas Instruments provides higher output current capability at 1A and maintains the full -40°C to 125°C operating temperature range. This part is ROHS3 compliant and active but features surface mount formed leads and a higher voltage dropout specification of 1V at 1A. Selection of this part is appropriate for applications requiring higher current delivery than the original 250mA specification.

All substitute parts maintain the TO-220-3 package configuration and 5V fixed output voltage required for electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MIC2954-03WT directly replace the MIC2954-03BT without circuit modifications?

A: Yes. The MIC2954-03WT maintains identical electrical specifications including 5V fixed output, 250mA output current, 0.6V dropout at 250mA, and -40°C to 125°C operating temperature range. The TO-220-3 package pinout is identical. The primary difference is product status (active versus obsolete) and improved RoHS3 compliance.

Q: What are the limitations of the LM2930T-5.0/NOPB as a substitute?

A: The LM2930T-5.0/NOPB reduces output current capability to 150mA, which may not be suitable for applications requiring the full 250mA specification. Additionally, the maximum input voltage is limited to 26V compared to the original 30V specification, and the operating temperature range is restricted to -40°C to 85°C, excluding the upper 40°C of the original range.

Q: When should the LM2940T-5.0/LF08 be selected over the MIC2954-03WT?

A: The LM2940T-5.0/LF08 should be selected when application requirements exceed 250mA output current, as it provides 1A capability. However, this part features surface mount formed leads and higher voltage dropout at 1V, which may impact thermal performance in power-limited designs.

Q: Are all substitute parts RoHS compliant?

A: The MIC2954-03BT is RoHS non-compliant. All three substitute parts (MIC2954-03WT, LM2930T-5.0/NOPB, and LM2940T-5.0/LF08) are ROHS3 compliant, making them suitable for applications with RoHS compliance requirements.

Q: Do the substitute parts maintain the same protection features?

A: The MIC2954-03WT maintains identical protection features. The LM2930T-5.0/NOPB and LM2940T-5.0/LF08 provide comparable protection including over-current, over-temperature, and reverse polarity protection, though specific protection feature sets vary by manufacturer implementation.

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