MIC5259-3.0BD5-TR Equivalent & Substitute Parts

Part Overview

The MIC5259-3.0BD5-TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 3V output applications with 300mA current capacity in a TSOT-23-5 surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	300mA
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.55V @ 300mA
Quiescent Current	150 µA
Package Type	TSOT-23-5
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Under Voltage Lockout (UVLO)
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the MIC5259-3.0BD5-TR is determined by the following critical parameters:

Output Voltage: Must be fixed at 3V
Output Current Capacity: Minimum 300mA required for direct replacement
Package Type: TSOT-23-5 or compatible SOT-23-5 variants
Operating Temperature Range: -40°C ~ 125°C
Output Configuration: Positive fixed output, single regulator
Control Features: Enable function required

The substitute parts are categorized as follows:

MFR Recommended Substitutes (Microchip Technology): TC2185-3.0VCTTR and TC1054-3.0VCT713 are manufacturer-recommended alternatives from the same product family. These maintain the 3V fixed output and TSOT-23-5 package compatibility but differ in output current capacity.

Parametric Equivalent (Analog Devices Inc.): ADP122AUJZ-3.0-R7 provides functional equivalence with matching 300mA output current and 3V fixed output in the same package footprint, though from a different manufacturer.

Parameter Comparison

Parameter	MIC5259-3.0BD5-TR	TC2185-3.0VCTTR	TC1054-3.0VCT713	ADP122AUJZ-3.0-R7
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Analog Devices Inc.
Output Voltage	3V	3V	3V	3V
Output Current	300mA	150mA	50mA	300mA
Input Voltage (Max)	6V	6V	6.5V	5.5V
Dropout Voltage (Max)	0.55V @ 300mA	0.21V @ 150mA	0.12V @ 50mA	0.15V @ 300mA
Quiescent Current	150 µA	80 µA	80 µA	105 µA
Package Type	TSOT-23-5	SOT-23-5	SOT-23-5	TSOT-23-5
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	OCP, OTP, UVLO	OCP, OTP	OCP, OTP	OCP, OTP, UVLO
Product Status	Discontinued	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct 300mA Output Current Replacement:

ADP122AUJZ-3.0-R7 from Analog Devices Inc. is the primary parametric equivalent, matching the 300mA output current specification of the MIC5259-3.0BD5-TR. This part maintains TSOT-23-5 package compatibility, identical 3V fixed output voltage, and equivalent protection features including Under Voltage Lockout. The ADP122AUJZ-3.0-R7 is ROHS3 compliant and currently active in production, providing superior long-term availability compared to the discontinued MIC5259-3.0BD5-TR.

For Reduced Current Applications (150mA):

TC2185-3.0VCTTR is a Microchip Technology MFR-recommended substitute suitable for applications requiring 150mA or less. This part maintains the same manufacturer ecosystem, 3V output, and SOT-23-5 package compatibility. The TC2185-3.0VCTTR offers improved dropout voltage performance (0.21V @ 150mA) and ROHS3 compliance.

For Minimal Current Applications (50mA):

TC1054-3.0VCT713 is a Microchip Technology MFR-recommended substitute for applications requiring 50mA or less. This part provides the lowest dropout voltage (0.12V @ 50mA) and lowest quiescent current (80 µA) among all substitutes, beneficial for battery-powered or low-power applications. ROHS3 compliance is provided.

All substitute parts maintain the required -40°C ~ 125°C operating temperature range and Enable control feature. Selection should be based on actual circuit current requirements and compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can TC2185-3.0VCTTR replace MIC5259-3.0BD5-TR in all applications?

A: TC2185-3.0VCTTR is suitable only for applications requiring 150mA output current or less. The MIC5259-3.0BD5-TR is rated for 300mA; applications exceeding 150mA require ADP122AUJZ-3.0-R7 or equivalent 300mA-rated alternatives.

Q: What is the package compatibility between TSOT-23-5 and SOT-23-5?

A: TSOT-23-5 and SOT-23-5 are compatible package designations for the same physical footprint. Both are thin-profile 5-lead surface mount packages with identical pin spacing and land pattern requirements.

Q: Does ADP122AUJZ-3.0-R7 provide the same protection features as MIC5259-3.0BD5-TR?

A: ADP122AUJZ-3.0-R7 includes Over Current Protection, Over Temperature Protection, and Under Voltage Lockout (UVLO), matching the MIC5259-3.0BD5-TR protection feature set. TC2185-3.0VCTTR and TC1054-3.0VCT713 provide Over Current and Over Temperature Protection but do not include UVLO.

Q: Are all substitute parts RoHS compliant?

A: ADP122AUJZ-3.0-R7, TC2185-3.0VCTTR, and TC1054-3.0VCT713 are all ROHS3 compliant. The original MIC5259-3.0BD5-TR is RoHS non-compliant.

Q: What is the dropout voltage difference between MIC5259-3.0BD5-TR and ADP122AUJZ-3.0-R7?

A: MIC5259-3.0BD5-TR has a maximum dropout voltage of 0.55V @ 300mA, while ADP122AUJZ-3.0-R7 has 0.15V @ 300mA. The ADP122AUJZ-3.0-R7 provides significantly lower dropout voltage performance at equivalent current levels.

Q: Can TC1054-3.0VCT713 be used in high-current applications?

A: No. TC1054-3.0VCT713 is rated for maximum 50mA output current and is unsuitable for applications requiring 300mA. Current exceeding the part rating will result in thermal shutdown or component failure.

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