MIC2954-02BS TR Linear Voltage Regulator 5V 250mA Equivalent & Substitute Parts

Part Overview

The MIC2954-02BS TR is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 5V output at 250mA in a SOT-223-3 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MIC2954-02BS TR provides positive fixed output regulation 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	Microchip Technology
Part Number	MIC2954-02BS TR
Product Status	Obsolete
Output Voltage (Fixed)	5V
Output Current	250mA
Input Voltage (Max)	30V
Dropout Voltage	0.6V @ 250mA
Quiescent Current	300 µA
Package	SOT-223-3
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Protection Features	Load Dump, Over Current, Over Temperature, Reverse Polarity, UV POR
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the MIC2954-02BS TR is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 5V fixed
Output current capability: minimum 250mA
Package type: SOT-223-3
Input voltage tolerance: maximum 30V or higher
Dropout voltage: 0.6V or lower at rated current
Operating temperature range: -40°C to 125°C minimum
Surface mount configuration

Substitution Categories:

Category 1: Parametric Equivalents (Identical Electrical Specifications) MIC2954-02WS-TR and MIC2954-03WS-TR are parametric equivalents with identical electrical characteristics to the main part. These devices maintain the same 250mA output current, 0.6V dropout voltage, 30V maximum input voltage, and identical protection feature set. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and RoHS compliance status (ROHS3 Compliant versus non-compliant).

Category 2: Manufacturer Recommended Alternatives (Different Electrical Specifications) MCP1703-5002E/DB, LT1121 series, and LT1521 series represent manufacturer-recommended alternatives with modified electrical characteristics. These parts maintain 5V fixed output and SOT-223-3 packaging but differ in output current capability, dropout voltage, quiescent current, and input voltage limits. Selection depends on specific application requirements within the allowed parameter ranges.

Parameter Comparison

Parameter	MIC2954-02BS TR	MIC2954-02WS-TR	MIC2954-03WS-TR	MCP1703-5002E/DB	LT1121CST-5#PBF	LT1121IST-5#PBF	LT1521CST-5#PBF	LT1521IST-5#PBF
Manufacturer	Microchip	Microchip	Microchip	Microchip	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Output Voltage	5V	5V	5V	5V	5V	5V	5V	5V
Output Current	250mA	250mA	250mA	250mA	150mA	150mA	300mA	300mA
Input Voltage (Max)	30V	30V	30V	16V	30V	30V	20V	20V
Dropout Voltage	0.6V @ 250mA	0.6V @ 250mA	0.6V @ 250mA	0.65V @ 250mA	0.7V @ 150mA	0.7V @ 150mA	0.75V @ 300mA	0.75V @ 300mA
Quiescent Current	300 µA	300 µA	300 µA	5 µA	50 µA	50 µA	25 µA	25 µA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	0°C to 125°C	-40°C to 125°C	0°C to 125°C	-40°C to 125°C
Package	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223-3
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): MIC2954-02WS-TR and MIC2954-03WS-TR provide direct electrical equivalence to the MIC2954-02BS TR. Both maintain identical output current (250mA), dropout voltage (0.6V @ 250mA), input voltage rating (30V maximum), and protection feature set. These parts are active products with ROHS3 compliance, making them suitable for new designs requiring RoHS certification. The primary consideration is packaging format availability (Cut Tape & Digi-Reel® versus Tape & Reel).

Alternative Selection Based on Application Requirements:

For applications with input voltage limited to 16V or lower, MCP1703-5002E/DB offers significantly reduced quiescent current (5 µA versus 300 µA), beneficial for battery-powered or low-power standby applications. This part maintains 250mA output current and 5V fixed output but requires input voltage verification.

For applications requiring lower output current (150mA maximum), LT1121 series devices from Analog Devices provide active product status with ROHS3 compliance. LT1121CST-5#PBF and LT1121IST-5#PBF differ only in operating temperature range (0°C to 125°C versus -40°C to 125°C). These parts feature 50 µA quiescent current and 58dB PSRR at 120Hz with enable control functionality.

For applications requiring higher output current (300mA maximum), LT1521 series devices provide 300mA capability with 25 µA quiescent current and 58dB PSRR. LT1521CST-5#PBF and LT1521IST-5#PBF differ in operating temperature range (0°C to 125°C versus -40°C to 125°C). Input voltage is limited to 20V maximum.

All substitute parts maintain SOT-223-3 packaging and surface mount configuration, ensuring PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can MIC2954-02WS-TR directly replace MIC2954-02BS TR without circuit modification?

A: Yes. MIC2954-02WS-TR is a parametric equivalent with identical electrical specifications: 250mA output current, 0.6V dropout voltage at 250mA, 30V maximum input voltage, and identical protection features. The only differences are packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and RoHS compliance status. No circuit modification is required.

Q: What is the key difference between LT1121 and LT1521 series substitutes?

A: The primary difference is output current capability. LT1121 series devices deliver maximum 150mA output current, while LT1521 series devices deliver 300mA. Both maintain 5V fixed output, SOT-223-3 packaging, and identical protection features. Selection depends on application current requirements. LT1521 series also features lower quiescent current (25 µA versus 50 µA) and lower input voltage rating (20V maximum versus 30V).

Q: Is MCP1703-5002E/DB suitable for high input voltage applications?

A: No. MCP1703-5002E/DB has a maximum input voltage rating of 16V, compared to 30V for the original MIC2954-02BS TR. This part is suitable only for applications with input voltage limited to 16V or lower. Exceeding this rating will damage the device.

Q: What is the operating temperature range consideration when selecting between CST and IST variants?

A: CST variants (LT1121CST-5#PBF, LT1521CST-5#PBF) operate from 0°C to 125°C. IST variants (LT1121IST-5#PBF, LT1521IST-5#PBF) operate from -40°C to 125°C. For applications requiring full military or extended temperature range operation, IST variants are required. For commercial temperature range applications, CST variants are acceptable.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original MIC2954-02BS TR is RoHS non-compliant. If RoHS compliance is a design requirement, MIC2954-02WS-TR, MIC2954-03WS-TR, MCP1703-5002E/DB, and all LT1121/LT1521 variants meet this requirement.

Q: Can LT1121 series (150mA) be used in place of MIC2954-02BS TR (250mA)?

A: LT1121 series substitution is valid only if the application circuit draws maximum 150mA output current. If the circuit requires 250mA or higher, LT1121 series will not provide adequate current and may enter current-limit protection. For applications requiring full 250mA capability, use MIC2954-02WS-TR, MIC2954-03WS-TR, or LT1521 series (300mA).

Q: What packaging formats are available for each substitute part?

A: MIC2954-02WS-TR and MIC2954-03WS-TR are available in Cut Tape (CT) & Digi-Reel® format. MCP1703-5002E/DB is available in Tube packaging. LT1121 and LT1521 series are available in both Tube and Cut Tape (CT) & Digi-Reel® formats, identified by suffix #PBF (Tube) and #TRPBF (Cut Tape & Digi-Reel®).

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