MIC5259-2.5BD5-TR Equivalent & Substitute Parts

Part Overview

The MIC5259-2.5BD5-TR is a linear voltage regulator IC from Microchip Technology, delivering a fixed 2.5V output at 300mA in a TSOT-23-5 surface mount package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain electrical performance across output voltage, current capacity, dropout voltage, and protection features while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	300mA
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.55V @ 300mA
Quiescent Current	150 µA
Operating Temperature Range	-40°C ~ 125°C
Package Type	TSOT-23-5
Protection Features	Over Current, Over Temperature, Under Voltage Lockout (UVLO)
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Output voltage fixed at 2.5V
Output current capability of 300mA or greater
Input voltage maximum of 5.5V to 6V
Dropout voltage performance suitable for 300mA operation
TSOT-23-5 package compatibility
Presence of Enable control and Over Current/Over Temperature protection
Operating temperature range of -40°C to 125°C minimum

Substitute parts are grouped into three categories based on substitution relationship type: direct manufacturer equivalents (identical electrical and package specifications), manufacturer-recommended alternatives (functionally equivalent with minor parameter variations), and parametric equivalents (alternative manufacturer with matching performance envelope).

Parameter Comparison

Parameter	MIC5259-2.5BD5-TR	MIC5259-2.5YD5-TR	TC2015-2.5VCTTR	ADP122AUJZ-2.5-R7
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Analog Devices Inc.
Output Voltage	2.5V	2.5V	2.5V	2.5V
Output Current	300mA	300mA	100mA	300mA
Input Voltage (Max)	6V	6V	6V	5.5V
Dropout Voltage (Max)	0.55V @ 300mA	0.55V @ 300mA	0.14V @ 100mA	0.15V @ 300mA
Quiescent Current	150 µA	150 µA	80 µA	105 µA
Package	TSOT-23-5	TSOT-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, UVLO	OCP, OTP	OCP, OTP, UVLO
Product Status	Discontinued	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MIC5259-2.5YD5-TR is the primary direct substitute. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. Selection of this part eliminates obsolescence risk and satisfies modern regulatory requirements.

ADP122AUJZ-2.5-R7 serves as a parametric equivalent from Analog Devices Inc. This part delivers 300mA output current with superior dropout voltage performance (0.15V @ 300mA versus 0.55V), lower quiescent current (105 µA versus 150 µA), and maintains TSOT-23-5 packaging. Input voltage maximum is 5.5V, requiring verification against circuit design specifications. ROHS3 compliance and active product status support long-term availability.

TC2015-2.5VCTTR is a manufacturer-recommended alternative with reduced output current capacity (100mA versus 300mA). This part is suitable only for applications where load current does not exceed 100mA. Superior dropout voltage and lower quiescent current provide efficiency benefits in current-limited designs. ROHS3 compliance and active status ensure supply continuity.

MIC6315-31D3UY-TR is not a functional substitute. This part is a supervisor IC with different functional purpose and cannot replace the linear regulator application.

Frequently Asked Questions (FAQ)

Q: Can MIC5259-2.5YD5-TR be used as a direct replacement for MIC5259-2.5BD5-TR?

A: Yes. Both parts share identical electrical specifications, output voltage, current capacity, dropout voltage, protection features, and TSOT-23-5 packaging. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). No circuit modifications are required.

Q: What are the limitations of TC2015-2.5VCTTR as a substitute?

A: TC2015-2.5VCTTR is limited to 100mA output current, compared to 300mA for the original part. This part is suitable only for applications where maximum load current does not exceed 100mA. Verify actual circuit load requirements before selection. The part lacks Under Voltage Lockout (UVLO) protection.

Q: Is ADP122AUJZ-2.5-R7 compatible with all circuit designs using MIC5259-2.5BD5-TR?

A: ADP122AUJZ-2.5-R7 maintains 300mA output current and TSOT-23-5 packaging. However, maximum input voltage is 5.5V compared to 6V for the original part. Verify that circuit input voltage does not exceed 5.5V. The part offers superior dropout voltage and lower quiescent current, providing performance benefits in most applications.

Q: Are all substitute parts ROHS3 compliant?

A: MIC5259-2.5YD5-TR, TC2015-2.5VCTTR, and ADP122AUJZ-2.5-R7 are all ROHS3 compliant. The original MIC5259-2.5BD5-TR is non-compliant. Selection of any active substitute satisfies modern regulatory requirements.

Q: What is the package compatibility between substitute parts?

A: MIC5259-2.5YD5-TR and ADP122AUJZ-2.5-R7 use TSOT-23-5 packaging, identical to the original part. TC2015-2.5VCTTR uses SOT-23-5 packaging, which is mechanically compatible with TSOT-23-5 footprints on PCBs. No layout modifications are required for any substitute.

Q: Which substitute part offers the best performance for low-dropout applications?

A: ADP122AUJZ-2.5-R7 provides the lowest dropout voltage at 0.15V @ 300mA, compared to 0.55V for the original part and 0.14V @ 100mA for TC2015-2.5VCTTR. For applications requiring minimal voltage headroom, ADP122AUJZ-2.5-R7 is the optimal selection.

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