LP3962ES-1.8 Equivalent & Substitute Parts

Part Overview

The LP3962ES-1.8 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 1.8V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. This device is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and access components with improved specifications or active product status.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.55V @ 1.5A
Quiescent Current	9 mA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LP3962ES-1.8 are grouped into two categories based on substitution criteria:

Direct Manufacturer Substitutes (Texas Instruments): Parts that maintain identical electrical specifications and package compatibility. These include LP3962ES-1.8/NOPB, which is the RoHS3-compliant variant of the original part.

Parametric Equivalents (Texas Instruments): Parts that share the same output voltage (1.8V), output current (1.5A), package type (TO-263 DDPAK-5), and operating temperature range (-40°C to 125°C), but may differ in dropout voltage, quiescent current, or PSRR characteristics. These include LP3852ES-1.8/NOPB, LP3855ES-1.8/NOPB, LP3872ES-1.8/NOPB, LP3875ES-1.8/NOPB, and LP3965ES-1.8/NOPB.

Cross-Manufacturer Equivalents (Microchip Technology): The MIC39151-1.8WU and MIC39151-1.8WU-TR from Microchip Technology provide functional equivalence with identical output voltage and current specifications, matching package footprint, and active product status. These parts differ in maximum input voltage (16V vs. 7V) and protection features.

Key Substitution Criteria:

Fixed output voltage of 1.8V
Output current capability of 1.5A
TO-263 (DDPAK-5) package footprint
Operating temperature range of -40°C to 125°C
Enable control feature
Surface mount technology

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 1.5A	Quiescent Current	Product Status	RoHS Status
LP3962ES-1.8	Texas Instruments	1.8V	1.5A	7V	0.55V	9 mA	Not For New Designs	RoHS non-compliant
LP3962ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	9 mA	Active	ROHS3 Compliant
LP3852ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.38V	3 mA	Active	ROHS3 Compliant
LP3855ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.38V	3 mA	Active	ROHS3 Compliant
LP3872ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	5 mA	Active	ROHS3 Compliant
LP3875ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	5 mA	Active	ROHS3 Compliant
LP3965ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	9 mA	Active	ROHS3 Compliant
LP3872ES-1.8	Texas Instruments	1.8V	1.5A	7V	0.55V	5 mA	Not For New Designs	RoHS non-compliant
MIC39151-1.8WU	Microchip Technology	1.8V	1.5A	16V	0.5V	Not specified	Active	ROHS3 Compliant
MIC39151-1.8WU-TR	Microchip Technology	1.8V	1.5A	16V	0.5V	Not specified	Active	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS3 Compliance Requirement: Select LP3962ES-1.8/NOPB as the direct replacement. This part maintains identical electrical specifications and package compatibility while achieving ROHS3 compliance and active product status.

For Improved Power Efficiency: LP3852ES-1.8/NOPB and LP3855ES-1.8/NOPB offer reduced dropout voltage (0.38V vs. 0.55V) and lower quiescent current (3 mA vs. 9 mA), resulting in lower power dissipation. Both are ROHS3 compliant and active.

For Balanced Performance: LP3872ES-1.8/NOPB and LP3875ES-1.8/NOPB provide intermediate quiescent current (5 mA) with ROHS3 compliance and active status, suitable for applications requiring moderate power efficiency improvements.

For Higher Input Voltage Tolerance: MIC39151-1.8WU and MIC39151-1.8WU-TR from Microchip Technology accept input voltages up to 16V (compared to 7V for Texas Instruments variants) and include reverse polarity protection. These are active products with ROHS3 compliance. The MIC39151-1.8WU-TR variant is supplied in Tape & Reel packaging.

For Legacy Design Continuation: LP3872ES-1.8 (non-NOPB variant) maintains the original specifications but retains "Not For New Designs" status and RoHS non-compliance. Use only when existing inventory must be consumed.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP3962ES-1.8 with LP3962ES-1.8/NOPB?

A: Yes. LP3962ES-1.8/NOPB is the direct equivalent with identical electrical specifications and package footprint. The primary difference is ROHS3 compliance and active product status. Both use TO-263 (DDPAK-5) packaging and are pin-compatible.

Q: What is the difference between LP3852ES-1.8/NOPB and LP3855ES-1.8/NOPB?

A: Both parts are electrically identical with 1.8V output, 1.5A current, 0.38V dropout voltage, and 3 mA quiescent current. The difference lies in their internal design lineage within the Texas Instruments product family. Either part is suitable for direct substitution based on availability.

Q: Why does MIC39151-1.8WU have a higher maximum input voltage?

A: The MIC39151-1.8WU from Microchip Technology is designed for broader input voltage applications, accepting up to 16V compared to 7V for Texas Instruments variants. This provides greater design flexibility for systems with variable input sources. The part also includes reverse polarity protection, an additional protection feature not present in the LP39xx series.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the TO-263 (DDPAK-5) surface mount package with identical footprint and pinout compatibility. MIC39151-1.8WU-TR is the Tape & Reel variant of MIC39151-1.8WU, offering the same electrical specifications with different packaging format for automated assembly.

Q: Which substitute offers the best power efficiency?

A: LP3852ES-1.8/NOPB and LP3855ES-1.8/NOPB provide the lowest power dissipation with 0.38V dropout voltage and 3 mA quiescent current, compared to 0.55V and 9 mA for the original LP3962ES-1.8. These parts reduce standby power consumption and heat generation in battery-powered or thermally constrained applications.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance is required for products sold in the European Union and many other regions. If your application requires RoHS3 compliance, select from LP3962ES-1.8/NOPB, LP3852ES-1.8/NOPB, LP3855ES-1.8/NOPB, LP3872ES-1.8/NOPB, LP3875ES-1.8/NOPB, LP3965ES-1.8/NOPB, or the Microchip MIC39151 variants. Avoid LP3962ES-1.8 and LP3872ES-1.8 (non-NOPB variants) for new designs requiring compliance.

Q: What protection features does each part provide?

A: Texas Instruments LP39xx variants (LP3962, LP3852, LP3855, LP3872, LP3875, LP3965) include over current, over temperature, and short circuit protection. Microchip MIC39151 variants include over current, over temperature, and reverse polarity protection. All parts maintain the same operating temperature range of -40°C to 125°C.

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