MIC39151-1.8WU-TR Equivalent & Substitute Parts

Part Overview

The MIC39151-1.8WU-TR is a linear voltage regulator IC manufactured by Microchip Technology, delivering a fixed 1.8V output at 1.5A in a TO-263-5 surface mount package. This device is classified as a positive fixed output regulator with integrated protection features including over-current, over-temperature, and reverse polarity protection. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or supply chain optimization.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	MIC39151-1.8WU-TR
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.5V @ 1.5A
Package Type	TO-263-5 (D2PAK, 5 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity
Control Features	Enable
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the MIC39151-1.8WU-TR are classified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
Output current rating of 1.5A or higher
TO-263-5 package compatibility (D2PAK, 5 Leads + Tab)
Surface mount configuration
Operating temperature range of -40°C to 125°C
Enable control feature
Over-current and over-temperature protection

Substitute Categories:

Category A: Direct 1.5A Equivalents — Parts with identical 1.5A output current rating, matching input voltage specifications, and equivalent dropout characteristics. These include LP3962ES-1.8/NOPB, LP3962ESX-1.8/NOPB, LP3965ESX-1.8/NOPB, and LT1963AEQ-1.8 variants.

Category B: Higher Current Capability (3A) — Parts with 3A output current rating, providing additional design margin and thermal headroom. These include LP3966ES-1.8/NOPB, LP3966ESX-1.8/NOPB, and LT1764AEQ-1.8 variants. These are suitable for applications where the MIC39151-1.8WU-TR may operate near maximum current limits.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Package	Iq (mA)	RoHS Status
MIC39151-1.8WU-TR	Microchip	1.8V	1.5A	16V	0.5V @ 1.5A	TO-263-5	—	ROHS3
LP3962ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V @ 1.5A	TO-263-5	9	ROHS3
LP3962ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V @ 1.5A	TO-263-5	9	ROHS3
LP3965ESX-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V @ 1.5A	TO-263-5	9	ROHS3
LP3966ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V @ 3A	TO-263-5	9	ROHS3
LP3966ESX-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V @ 3A	TO-263-5	9	ROHS3
LT1764AEQ-1.8#PBF	Analog Devices	1.8V	3A	20V	0.66V @ 3A	DDPAK-5	1.5	ROHS3
LT1764AEQ-1.8#TRPBF	Analog Devices	1.8V	3A	20V	0.66V @ 3A	DDPAK-5	1.5	ROHS3
LT1963AEQ-1.8#PBF	Analog Devices	1.8V	1.5A	20V	0.55V @ 1.5A	DDPAK-5	1.5	ROHS3
LT1963AEQ-1.8#TRPBF	Analog Devices	1.8V	1.5A	20V	0.55V @ 1.5A	DDPAK-5	1.5	ROHS3

Engineering Selection Recommendations

For Direct Replacement (1.5A Output Current):

LT1963AEQ-1.8#TRPBF and LT1963AEQ-1.8#PBF (Analog Devices) are preferred direct substitutes. Both maintain 1.5A output current, feature superior input voltage tolerance (20V maximum versus 16V), lower quiescent current (1.5 mA), and higher PSRR (63 dB at 120 Hz). MSL rating of 1 (Unlimited) provides superior moisture handling compared to the MIC39151-1.8WU-TR. All parts are ROHS3 compliant and Active status.

LP3962ES-1.8/NOPB, LP3962ESX-1.8/NOPB, and LP3965ESX-1.8/NOPB (Texas Instruments) provide functional equivalence at 1.5A output. These parts feature lower input voltage maximum (7V) and slightly higher dropout voltage (0.55V). All are ROHS3 compliant and Active status. LP3965ESX-1.8/NOPB carries REACH Affected status, requiring compliance verification in regulated applications.

For Higher Current Applications (3A Output Current):

LP3966ES-1.8/NOPB and LP3966ESX-1.8/NOPB (Texas Instruments) provide 3A output current capability with identical 1.8V fixed output. Input voltage maximum is 7V with 1.2V dropout at 3A. Both are ROHS3 compliant and Active status.

LT1764AEQ-1.8#PBF and LT1764AEQ-1.8#TRPBF (Analog Devices) deliver 3A output with superior input voltage tolerance (20V maximum), lower dropout (0.66V at 3A), and lower quiescent current (1.5 mA). MSL rating of 1 (Unlimited) and ROHS3 compliance support demanding applications.

Packaging Considerations:

All substitute parts use TO-263-5 or DDPAK-5 packages, which are mechanically and electrically compatible with the MIC39151-1.8WU-TR. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) do not affect electrical performance or PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP3962ES-1.8/NOPB replace MIC39151-1.8WU-TR in all applications?

A: LP3962ES-1.8/NOPB is electrically compatible for 1.5A applications. The primary difference is input voltage maximum: LP3962ES-1.8/NOPB accepts 7V maximum input, while MIC39151-1.8WU-TR accepts 16V. Applications with input voltages exceeding 7V require alternative substitutes such as LT1963AEQ-1.8#TRPBF or LT1764AEQ-1.8#TRPBF.

Q: What is the difference between LP3962ES-1.8/NOPB and LP3962ESX-1.8/NOPB?

A: Both parts are electrically identical with 1.5A output current, 1.8V fixed output, and TO-263-5 package. The difference is packaging format: LP3962ES-1.8/NOPB is supplied in Tube, while LP3962ESX-1.8/NOPB is supplied in Cut Tape & Digi-Reel. Electrical performance and PCB compatibility are identical.

Q: Should I use 3A-rated parts (LP3966 or LT1764) if my application only requires 1.5A?

A: 3A-rated parts are suitable for 1.5A applications and provide additional thermal margin and design flexibility. However, they are not required for 1.5A operation. Selection depends on thermal budget, PCB layout constraints, and cost considerations. Direct 1.5A equivalents (LP3962, LP3965, LT1963) are appropriate for applications with adequate thermal management.

Q: What is the significance of MSL rating differences between MIC39151-1.8WU-TR and substitute parts?

A: MIC39151-1.8WU-TR has MSL 3 (168 hours), while Analog Devices parts (LT1963, LT1764) have MSL 1 (Unlimited). MSL rating indicates moisture sensitivity during storage and handling. MSL 1 parts tolerate longer shelf life and higher humidity without baking requirements. For high-volume manufacturing or extended storage, MSL 1 parts reduce process risk.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. LP3965ESX-1.8/NOPB carries REACH Affected status, requiring compliance verification in applications subject to REACH regulations. Other parts are REACH Unaffected.

Q: Can I use LT1963AEQ-1.8#PBF (Tube packaging) instead of LT1963AEQ-1.8#TRPBF (Cut Tape & Digi-Reel)?

A: Both parts are electrically and mechanically identical. Packaging format (Tube versus Cut Tape & Digi-Reel) affects supply chain logistics and handling but not electrical performance or PCB compatibility. Selection depends on assembly process requirements and inventory management.

Q: What is the impact of dropout voltage differences on circuit design?

A: MIC39151-1.8WU-TR has 0.5V dropout at 1.5A. LP3962/LP3965 have 0.55V dropout, while LT1963 have 0.55V dropout and LT1764 have 0.66V dropout at 3A. For applications with tight input voltage margins, lower dropout voltage (MIC39151, LT1963 at 1.5A) is preferred. Higher dropout (LT1764 at 3A) is acceptable for applications with adequate input voltage headroom.

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