MIC39151-2.5WU-TR Equivalent & Substitute Parts

Part Overview

The MIC39151-2.5WU-TR is a linear voltage regulator IC from Microchip Technology, delivering a fixed 2.5V output at 1.5A in a TO-263-5 surface mount package. This device is classified as Active status and is designed for applications requiring stable low-voltage power delivery with integrated protection features including over-current, over-temperature, and reverse polarity protection. Substitute parts are identified based on matching output voltage, current rating, package compatibility, and electrical performance within specified operating parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC39151-2.5WU-TR
Manufacturer	Microchip Technology
Output Voltage (Fixed)	2.5V
Output Current	1.5A
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.5V @ 1.5A
Package / Case	TO-263-5 (D2PAK, 5 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MIC39151-2.5WU-TR are grouped based on the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 2.5V
Output current rating of 1.5A or higher
TO-263 package family (D2PAK-5 configuration)
Surface mount technology
Operating temperature range of -40°C to 125°C
Active product status

Substitution Logic: Parts are classified into two functional groups based on output current capacity. Group 1 includes regulators rated at exactly 1.5A output current, providing direct electrical equivalence. Group 2 includes regulators rated at 3A output current, which can substitute for 1.5A applications due to higher current headroom, though input voltage specifications may differ. All substitute parts maintain the same fixed 2.5V output voltage and TO-263 package footprint, ensuring PCB-level compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Product Status	RoHS Status
MIC39151-2.5WU-TR	Microchip Technology	2.5V	1.5A	16V	0.5V @ 1.5A	TO-263-5	Active	ROHS3 Compliant
LP3962ES-2.5/NOPB	National Semiconductor	2.5V	1.5A	7V	0.55V @ 1.5A	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3962ESX-2.5/NOPB	National Semiconductor	2.5V	1.5A	7V	0.55V @ 1.5A	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3965ES-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3965ESX-2.5/NOPB	Texas Instruments	2.5V	1.5A	7V	0.55V @ 1.5A	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3966ES-2.5/NOPB	Texas Instruments	2.5V	3A	7V	1.2V @ 3A	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LP3966ESX-2.5/NOPB	Texas Instruments	2.5V	3A	7V	1.2V @ 3A	TO-263 (DDPAK-5)	Active	ROHS3 Compliant
LT1764AEQ-2.5#PBF	Analog Devices Inc.	2.5V	3A	20V	0.66V @ 3A	DDPAK-5	Active	ROHS3 Compliant
LT1764AEQ-2.5#TRPBF	Analog Devices Inc.	2.5V	3A	20V	0.66V @ 3A	DDPAK-5	Active	ROHS3 Compliant
LT1764EQ-2.5#TRPBF	Analog Devices Inc.	2.5V	3A	20V	0.66V @ 3A	DDPAK-5	Active	ROHS3 Compliant
LT1963AEQ-2.5#PBF	Analog Devices Inc.	2.5V	1.5A	20V	0.55V @ 1.5A	DDPAK-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (1.5A Output Current): LP3962ES-2.5/NOPB, LP3962ESX-2.5/NOPB, LP3965ES-2.5/NOPB, LP3965ESX-2.5/NOPB, and LT1963AEQ-2.5#PBF provide electrical equivalence at the 1.5A output current rating. All are Active status products with ROHS3 compliance. Selection among these depends on input voltage requirements: National Semiconductor and Texas Instruments LP39xx series support maximum 7V input, while Analog Devices LT1963AEQ-2.5#PBF supports 20V input. The MIC39151-2.5WU-TR supports 16V input, making it suitable for higher input voltage applications.

Higher Current Alternatives (3A Output Current): LP3966ES-2.5/NOPB, LP3966ESX-2.5/NOPB, LT1764AEQ-2.5#PBF, LT1764AEQ-2.5#TRPBF, and LT1764EQ-2.5#TRPBF are rated for 3A output current and can substitute in applications where the original 1.5A specification provides insufficient margin. These parts maintain 2.5V fixed output and TO-263 package compatibility. Input voltage limits remain at 7V for Texas Instruments LP3966 series and 20V for Analog Devices LT1764 series.

Packaging Considerations: Bulk packaging (LP3962ES-2.5/NOPB, LP3965ES-2.5/NOPB, LP3966ES-2.5/NOPB, LT1764AEQ-2.5#PBF, LT1963AEQ-2.5#PBF) and Tape & Reel packaging (LP3962ESX-2.5/NOPB, LP3965ESX-2.5/NOPB, LP3966ESX-2.5/NOPB, LT1764AEQ-2.5#TRPBF, LT1764EQ-2.5#TRPBF) are available. All parts are Active status and ROHS3 compliant, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3966ES-2.5/NOPB (3A) replace MIC39151-2.5WU-TR (1.5A)? A: Yes. The LP3966ES-2.5/NOPB maintains the same 2.5V fixed output voltage and TO-263 package footprint. The higher 3A current rating provides additional headroom for 1.5A applications. However, the maximum input voltage is 7V compared to the MIC39151's 16V specification.

Q: What is the difference between LP3962ES-2.5/NOPB and LP3962ESX-2.5/NOPB? A: Both parts are electrically identical with 1.5A output current and 2.5V fixed output. The primary difference is packaging: LP3962ES-2.5/NOPB is supplied in Bulk, while LP3962ESX-2.5/NOPB is supplied in Tape & Reel format.

Q: Why do Analog Devices LT1764 and LT1963 parts support 20V input while National Semiconductor and Texas Instruments LP39xx series support only 7V? A: Input voltage rating is a distinct electrical specification determined by the regulator's internal design. The MIC39151-2.5WU-TR supports 16V input. When selecting substitutes, verify that the application's input voltage does not exceed the substitute part's maximum rating.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the MIC39151-2.5WU-TR compliance status.

Q: Can I use LT1764AEQ-2.5#PBF (Tube packaging) in automated assembly? A: LT1764AEQ-2.5#PBF is supplied in Tube packaging, which is suitable for manual or semi-automated assembly. For fully automated pick-and-place assembly, use Tape & Reel variants such as LT1764AEQ-2.5#TRPBF or LT1764EQ-2.5#TRPBF.

Q: What is the significance of the dropout voltage difference between MIC39151 (0.5V @ 1.5A) and LP3962 (0.55V @ 1.5A)? A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. The MIC39151 has a 0.05V lower dropout specification, providing slightly better performance in low input voltage conditions. Both values are within typical operating margins for most applications.

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