LP3962ET-3.3 Equivalent & Substitute Parts

Part Overview

The LP3962ET-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 1.5A maximum current in a TO-220-5 package configuration. The main part number LP3962ET-3.3 is currently listed as obsolete, making substitute parts necessary for ongoing design support and procurement. Alternative models within the same electrical and mechanical specifications are available to maintain circuit functionality and performance.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Maximum Output Current	1.5A
Maximum Input Voltage	7V
Output Configuration	Positive
Output Type	Fixed
Number of Regulators	1
Package / Case	TO-220-5 Formed Leads
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3962ET-3.3 are classified based on strict electrical and mechanical parameter alignment. All substitute candidates maintain the following core specifications: 3.3V fixed output voltage, 1.5A maximum output current, 7V maximum input voltage, TO-220-5 package, through-hole mounting, -40°C to 125°C operating temperature range, and identical protection features (Over Current, Over Temperature, Short Circuit).

Substitutes are grouped into two categories:

Direct Manufacturer Substitutes: Parts with identical electrical specifications and active product status, differing only in packaging format or RoHS compliance revision.

Parametric Equivalents: Parts meeting all core electrical and mechanical requirements but with variations in secondary parameters such as quiescent current (Iq), dropout voltage, or PSRR characteristics. These variations remain within acceptable operational tolerances for the specified output voltage and current rating.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Dropout (Max) @ 1.5A	Quiescent Current (Iq)	Current - Supply (Max)	PSRR	RoHS Status	Packaging	Inventory (Pcs)
LP3962ET-3.3	Texas Instruments	Obsolete	0.55V	9 mA	15 mA	—	RoHS non-compliant	—	2120
LP3962ET-3.3/NOPB	Texas Instruments	Active	0.55V	9 mA	15 mA	—	ROHS3 Compliant	Tube	1106
LP3852ET-3.3/NOPB	National Semiconductor	Active	0.38V	3 mA	10 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	Bulk	1098
LP3855ET-3.3/NOPB	Texas Instruments	Active	0.38V	3 mA	10 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	Tube	730
LP3875ET-3.3/NOPB	Texas Instruments	Active	0.55V	5 mA	15 mA	73dB ~ 57dB (120Hz)	ROHS3 Compliant	Tube	1163
LP3962ET-3.3/LB05	Texas Instruments	Last Time Buy	0.55V	9 mA	15 mA	—	ROHS3 Compliant	Tube	855
LP3965ET-3.3/NOPB	Texas Instruments	Active	0.55V	9 mA	15 mA	—	ROHS3 Compliant	Tube	1142

Engineering Selection Recommendations

Preferred Primary Substitute: LP3962ET-3.3/NOPB

This part maintains identical electrical specifications to the obsolete LP3962ET-3.3 while offering active product status and ROHS3 compliance. The only difference is packaging format (Tube) and RoHS certification level. This represents the direct replacement path with no circuit redesign required.

Secondary Substitutes for Enhanced Performance: LP3855ET-3.3/NOPB and LP3852ET-3.3/NOPB

Both parts deliver improved performance characteristics: reduced dropout voltage (0.38V vs. 0.55V), lower quiescent current (3 mA vs. 9 mA), and documented PSRR specifications (73dB ~ 57dB at 120Hz). These parts are suitable for applications where lower power dissipation or improved noise rejection is beneficial. LP3855ET-3.3/NOPB is manufactured by Texas Instruments; LP3852ET-3.3/NOPB is from National Semiconductor.

Alternative with Intermediate Performance: LP3875ET-3.3/NOPB

This Texas Instruments part offers reduced quiescent current (5 mA) and PSRR specification while maintaining the original dropout voltage (0.55V) and supply current rating (15 mA). Suitable for designs requiring lower standby power consumption.

End-of-Life Consideration: LP3962ET-3.3/LB05

This variant carries Last Time Buy status with ROHS3 compliance. Electrical specifications match the obsolete LP3962ET-3.3 exactly. Use only if existing inventory of LP3962ET-3.3/NOPB is unavailable and long-term supply is not required.

Not Recommended for New Designs: LP3965ET-3.3/NOPB

While electrically equivalent, this part is listed with a different HTSUS code (8542.39.0060 vs. 8542.39.0001), indicating potential classification differences. Verify regulatory and tariff implications before selection.

Frequently Asked Questions (FAQ)

Q: Can LP3962ET-3.3/NOPB be used as a direct drop-in replacement for the obsolete LP3962ET-3.3?

A: Yes. LP3962ET-3.3/NOPB is electrically and mechanically identical to LP3962ET-3.3. The differences are packaging format (Tube vs. unspecified) and RoHS compliance revision (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the advantage of using LP3855ET-3.3/NOPB or LP3852ET-3.3/NOPB over LP3962ET-3.3/NOPB?

A: Both parts reduce dropout voltage from 0.55V to 0.38V and quiescent current from 9 mA to 3 mA. This results in lower power dissipation and heat generation. Additionally, both provide documented PSRR specifications (73dB ~ 57dB at 120Hz), improving noise rejection. These benefits are applicable to power-sensitive or noise-critical applications.

Q: Are there any compatibility concerns when switching between these substitute parts?

A: All substitute parts share identical output voltage (3.3V), output current (1.5A), input voltage rating (7V), TO-220-5 package, and protection features. Pin configuration and mounting remain unchanged. No PCB redesign is necessary. Verify that your application can tolerate variations in dropout voltage and quiescent current if selecting parametric equivalents.

Q: What is the difference between LP3962ET-3.3/NOPB and LP3962ET-3.3/LB05?

A: Both parts are electrically identical. LP3962ET-3.3/LB05 carries Last Time Buy status, indicating limited future availability. LP3962ET-3.3/NOPB has active product status with ongoing supply. For new designs or long-term production, select LP3962ET-3.3/NOPB.

Q: Can I use LP3965ET-3.3/NOPB as a substitute?

A: LP3965ET-3.3/NOPB meets all electrical and mechanical specifications. However, it carries a different HTSUS tariff classification code. Verify regulatory and procurement implications for your specific application before selection.

Q: Which substitute offers the best balance of compatibility and performance improvement?

A: LP3855ET-3.3/NOPB provides the optimal balance. It is manufactured by Texas Instruments (same as the original), maintains active product status, offers improved dropout voltage and quiescent current specifications, includes PSRR documentation, and is available in Tube packaging. It requires no circuit modifications while delivering measurable performance benefits.

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