MIC5259-3.3BD5-TR Equivalent & Substitute Parts

Part Overview

The MIC5259-3.3BD5-TR is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 3.3V output at 300mA in a TSOT-23-5 surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The regulator includes integrated protection features for over-current, over-temperature, and under-voltage lockout conditions, with an enable control feature for flexible power management applications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Output Voltage (Fixed)	3.3V
Output Current	300mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.55V @ 300mA
Quiescent Current	150 µA
Package	TSOT-23-5
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Under Voltage Lockout (UVLO)
Control Features	Enable
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the MIC5259-3.3BD5-TR is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 300mA or greater
TSOT-23-5 package compatibility
Maximum input voltage of 6V or higher
Operating temperature range of -40°C to 125°C
Presence of enable control and protection features (over-current, over-temperature, UVLO)

Substitute parts are grouped into two categories:

Parametric Equivalent (Direct Replacement): Parts with identical electrical specifications and package, differing only in packaging format (tape & reel vs. bulk).

Functional Equivalent (Higher Current Capability): Parts with lower output current ratings (50mA, 100mA, 150mA) that maintain the same 3.3V output and package but are suitable only for applications requiring reduced current delivery.

Cross-Manufacturer Equivalent: Parts from alternative manufacturers (Analog Devices) meeting the same electrical and package specifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
MIC5259-3.3BD5-TR	Microchip Technology	3.3V	300mA	6V	0.55V @ 300mA	150 µA	TSOT-23-5	Discontinued	RoHS non-compliant
MIC5259-3.3YD5-TR	Microchip Technology	3.3V	300mA	6V	0.55V @ 300mA	150 µA	TSOT-23-5	Active	ROHS3 Compliant
ADP122AUJZ-3.3-R7	Analog Devices Inc.	3.3V	300mA	5.5V	0.15V @ 300mA	105 µA	TSOT-23-5	Active	ROHS3 Compliant
TC2185-3.3VCTTR	Microchip Technology	3.3V	150mA	6V	0.21V @ 150mA	80 µA	TSOT-23-5	Active	ROHS3 Compliant
TC2015-3.3VCTTR	Microchip Technology	3.3V	100mA	6V	0.14V @ 100mA	80 µA	TSOT-23-5	Active	ROHS3 Compliant
TC2014-3.3VCTTR	Microchip Technology	3.3V	50mA	6V	0.07V @ 50mA	80 µA	TSOT-23-5	Active	ROHS3 Compliant
TC1054-3.3VCT713	Microchip Technology	3.3V	50mA	6.5V	0.12V @ 50mA	80 µA	TSOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Recommended for Continuity):

MIC5259-3.3YD5-TR is the primary substitute for MIC5259-3.3BD5-TR. Both parts are electrically and mechanically identical with the same 300mA output current, 3.3V fixed output, and TSOT-23-5 package. The key difference is product status and compliance: MIC5259-3.3YD5-TR is active and ROHS3 compliant, whereas the original part is discontinued and RoHS non-compliant. This part maintains full backward compatibility with existing designs.

Cross-Manufacturer Alternative:

ADP122AUJZ-3.3-R7 from Analog Devices Inc. provides equivalent 300mA output current and 3.3V fixed output in the same TSOT-23-5 package. This part offers superior performance characteristics with lower dropout voltage (0.15V vs. 0.55V) and lower quiescent current (105 µA vs. 150 µA). Maximum input voltage is 5.5V, which is lower than the original 6V specification. This part is active and ROHS3 compliant.

Lower Current Alternatives (Application-Dependent):

TC2185-3.3VCTTR (150mA), TC2015-3.3VCTTR (100mA), TC2014-3.3VCTTR (50mA), and TC1054-3.3VCT713 (50mA) are suitable only for applications where the required output current does not exceed their respective ratings. All are active, ROHS3 compliant, and maintain the 3.3V output and TSOT-23-5 package. These parts offer lower quiescent current (80 µA) and improved dropout voltage characteristics compared to the original part.

Frequently Asked Questions (FAQ)

Q: Can MIC5259-3.3YD5-TR be used as a direct replacement for MIC5259-3.3BD5-TR?

A: Yes. Both parts are electrically and mechanically identical with 300mA output current, 3.3V fixed output, and TSOT-23-5 packaging. The primary difference is that MIC5259-3.3YD5-TR is currently active and ROHS3 compliant, making it the recommended substitute for the discontinued original part.

Q: What is the difference between MIC5259-3.3BD5-TR and MIC5259-3.3YD5-TR?

A: The parts are electrically equivalent. The difference is in packaging format and compliance status. MIC5259-3.3BD5-TR uses bulk packaging and is RoHS non-compliant (discontinued). MIC5259-3.3YD5-TR uses cut tape & Digi-Reel packaging and is ROHS3 compliant (active).

Q: Can I use TC2185-3.3VCTTR instead of MIC5259-3.3BD5-TR?

A: TC2185-3.3VCTTR can be used only if your application requires 150mA or less output current. It maintains the same 3.3V output and TSOT-23-5 package but has half the current capability of the original part. Verify that your circuit does not exceed 150mA before substitution.

Q: What are the advantages of ADP122AUJZ-3.3-R7 over MIC5259-3.3YD5-TR?

A: ADP122AUJZ-3.3-R7 offers lower dropout voltage (0.15V vs. 0.55V) and lower quiescent current (105 µA vs. 150 µA), resulting in improved efficiency and reduced heat dissipation. Both parts deliver 300mA at 3.3V in the same TSOT-23-5 package. The trade-off is a lower maximum input voltage specification (5.5V vs. 6V).

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except the original MIC5259-3.3BD5-TR, which is RoHS non-compliant. If RoHS compliance is required for your application, use MIC5259-3.3YD5-TR or ADP122AUJZ-3.3-R7 as direct replacements.

Q: Can I use a lower current part if my circuit only draws 100mA?

A: Yes, if your circuit draws 100mA or less, TC2015-3.3VCTTR (100mA) or TC2014-3.3VCTTR (50mA) can be used. However, verify that peak current transients do not exceed the part's rated output current. Using a part with higher current capability than required provides design margin and is generally preferred.

Q: What is the package compatibility between all these parts?

A: All substitute parts use the TSOT-23-5 (SOT-23-5 Thin) package, which is mechanically and electrically compatible with the original MIC5259-3.3BD5-TR. No PCB layout changes are required for substitution.

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