LP3962EMP-1.8 Equivalent & Substitute Parts

Part Overview

The LP3962EMP-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 1.8V output at 1.5A maximum current in a SOT-223-5 surface mount package. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

The LP3962EMP-1.8 carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part number. Equivalent substitute parts are necessary to maintain design continuity and ensure long-term component availability for production and field replacement scenarios.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Dropout Voltage @ 1.5A	0.55V
Quiescent Current (Iq)	9 mA
Supply Current (Max)	15 mA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LP3962EMP-1.8 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
Output current rating of 1.5A
Maximum input voltage of 7V
SOT-223-5 package compatibility (TO-261-5, TO-261AB case)
Enable control feature
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range: -40°C to 125°C

Secondary Compatibility Factors:

Dropout voltage performance (0.43V to 0.55V acceptable range)
Quiescent current specifications (3 mA to 9 mA acceptable range)
Supply current specifications (10 mA to 15 mA acceptable range)
RoHS3 compliance status

Substitute parts are grouped into two categories: Direct equivalents (identical part number with different packaging designation) and parametric equivalents (functionally compatible with specified electrical variations within acceptable operating margins).

Parameter Comparison

Part Number	Manufacturer	Status	Output Voltage	Output Current	Dropout @ 1.5A	Iq (mA)	Supply Current Max	PSRR	RoHS	Packaging
LP3962EMP-1.8	Texas Instruments	Last Time Buy	1.8V	1.5A	0.55V	9	15 mA	—	ROHS3	Tape & Reel
LP3962EMP-1.8/NOPB	National Semiconductor	Active	1.8V	1.5A	0.55V	9	15 mA	—	—	Bulk
LP3852EMP-1.8	Texas Instruments	Last Time Buy	1.8V	1.5A	0.43V	3	10 mA	73dB ~ 57dB (120Hz)	ROHS3	Tape & Reel
LP3852EMP-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.43V	3	10 mA	73dB ~ 57dB (120Hz)	ROHS3	Tape & Reel
LP3852EMPX-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.43V	3	10 mA	73dB ~ 57dB (120Hz)	ROHS3	Tape & Reel
LP3855EMP-1.8	Texas Instruments	Obsolete	1.8V	1.5A	0.43V	3	10 mA	73dB ~ 57dB (120Hz)	Non-compliant	Cut Tape & Digi-Reel
LP3855EMP-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.43V	3	10 mA	73dB ~ 57dB (120Hz)	ROHS3	Tape & Reel
LP3872EMP-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.55V	5	15 mA	73dB ~ 57dB (120Hz)	ROHS3	Tape & Reel
LP3875EMP-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.55V	5	15 mA	73dB ~ 57dB (120Hz)	ROHS3	Tape & Reel
LP3965EMP-1.8/NOPB	Texas Instruments	Active	1.8V	1.5A	0.55V	9	15 mA	—	ROHS3	Tape & Reel

Engineering Selection Recommendations

Preferred Substitutes (Active Status, ROHS3 Compliant):

LP3852EMP-1.8/NOPB and LP3852EMPX-1.8/NOPB are the primary recommended substitutes. Both parts maintain Active product status with ROHS3 compliance. These devices offer improved performance characteristics with lower dropout voltage (0.43V vs. 0.55V) and reduced quiescent current (3 mA vs. 9 mA), resulting in lower power dissipation and improved efficiency in battery-powered applications.

LP3855EMP-1.8/NOPB provides an alternative with identical electrical performance to the LP3852 series while maintaining Active status and ROHS3 compliance.

LP3872EMP-1.8/NOPB and LP3875EMP-1.8/NOPB are suitable alternatives with Active status and ROHS3 compliance. These parts match the original LP3962EMP-1.8 dropout voltage specification (0.55V) while offering moderate quiescent current (5 mA) and enhanced PSRR performance (73dB ~ 57dB at 120Hz).

LP3965EMP-1.8/NOPB maintains electrical parity with the original part (0.55V dropout, 9 mA Iq) while offering Active status and ROHS3 compliance.

Avoid:

LP3855EMP-1.8 (Obsolete status, RoHS non-compliant) should not be selected for new designs or long-term production applications.

LP3962EMP-1.8/NOPB (National Semiconductor) is available in Bulk packaging only, which may not align with standard manufacturing requirements for Tape & Reel format.

Frequently Asked Questions (FAQ)

Q: Can LP3852EMP-1.8/NOPB directly replace LP3962EMP-1.8 in existing designs?

A: Yes. Both parts deliver 1.8V at 1.5A with identical package geometry (SOT-223-5). The LP3852 series offers superior performance with lower dropout voltage and quiescent current. Pin-to-pin compatibility and functional equivalence are confirmed across all protection and control features.

Q: What is the difference between LP3852EMP-1.8 and LP3852EMP-1.8/NOPB?

A: The /NOPB designation indicates "No Plumbum" (lead-free) processing. Both variants are electrically and functionally identical. The /NOPB version is the current production standard and carries Active status, while the non-suffixed version is Last Time Buy.

Q: Why do some substitutes show lower quiescent current?

A: The LP3852 and LP3855 series employ improved internal circuit design, reducing standby power consumption from 9 mA to 3 mA. This represents a design enhancement and does not affect functional compatibility. Lower quiescent current is beneficial for battery-powered applications.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes except LP3855EMP-1.8 (Obsolete) carry ROHS3 compliance certification. LP3855EMP-1.8 is RoHS non-compliant and should not be used in new designs or applications requiring regulatory compliance.

Q: What is the significance of PSRR specification in the LP3872 and LP3875 variants?

A: Power Supply Rejection Ratio (PSRR) of 73dB ~ 57dB (120Hz) indicates superior noise rejection performance. This specification is not provided for the original LP3962EMP-1.8. The enhanced PSRR in substitute variants provides additional noise immunity in sensitive analog circuits.

Q: Can I use LP3965EMP-1.8/NOPB as a direct replacement?

A: Yes. The LP3965EMP-1.8/NOPB maintains electrical parity with the original part across all critical parameters: 0.55V dropout voltage, 9 mA quiescent current, and 15 mA supply current. It carries Active status and ROHS3 compliance.

Q: What packaging formats are available for substitutes?

A: All recommended substitutes are supplied in Tape & Reel (TR) format, matching standard manufacturing requirements. LP3962EMP-1.8/NOPB (National Semiconductor) is available only in Bulk packaging and may require special handling or reeling for automated assembly.

Q: Are there any thermal or operating temperature differences between substitutes?

A: All parts, including the original LP3962EMP-1.8 and all substitutes, operate across the identical temperature range of -40°C to 125°C. No thermal performance differences exist across the product family.

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