LP3883ES-1.2 Equivalent & Substitute Parts

Part Overview

The LP3883ES-1.2 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 1.2V at 3A with a maximum dropout voltage of 0.42V. The device integrates over-current, over-temperature, and short-circuit protection, making it suitable for low-voltage power supply applications requiring fast response and low dropout characteristics.

The main part (LP3883ES-1.2) carries a Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications currently using this regulator.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.2V
Output Current	3A
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.42V @ 3A
Quiescent Current	30 µA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP3883ES-1.2 are identified based on strict electrical and mechanical parameter matching:

Direct Manufacturer Equivalent: LP3883ES-1.2/NOPB (National Semiconductor) — Identical electrical specifications and package configuration. This part maintains all key parameters including 1.2V fixed output, 3A current rating, 0.42V dropout voltage, and TO-263 packaging.

Parametric Equivalent: LP38843S-1.2/NOPB (Texas Instruments) — Shares the same output voltage (1.2V), output current (3A), input voltage rating (5.5V), quiescent current (30 µA), package type (TO-263), and protection features. Acceptable variance exists in dropout voltage (0.5V @ 3A versus 0.42V) and supply current (40 mA versus 8 mA), which remain within functional tolerance for most applications.

All substitute parts maintain identical output configuration (positive fixed), control features (enable), and operating temperature range (-40°C to 125°C).

Parameter Comparison

Parameter	LP3883ES-1.2	LP3883ES-1.2/NOPB	LP38843S-1.2/NOPB
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments
Output Voltage	1.2V	1.2V	1.2V
Output Current	3A	3A	3A
Input Voltage (Max)	5.5V	5.5V	5.5V
Dropout Voltage (Max)	0.42V @ 3A	0.42V @ 3A	0.5V @ 3A
Quiescent Current	30 µA	30 µA	30 µA
Supply Current (Max)	8 mA	8 mA	40 mA
PSRR	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)
Package Type	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

For immediate replacement: LP3883ES-1.2/NOPB is the direct equivalent, offering identical electrical performance and package compatibility. Both the main part and this substitute are ROHS3 compliant and carry EAR99 ECCN classification.

For long-term supply assurance: LP38843S-1.2/NOPB is recommended as the primary alternative. This part maintains Active product status from Texas Instruments, ensuring continued availability and support. The parametric differences (0.08V higher dropout voltage and 32 mA higher supply current) are acceptable for applications where the main part specifications provide design margin. Both parts share identical output voltage, current rating, package type, and protection architecture.

Selection between the two substitutes depends on supply chain availability and design margin requirements. The LP38843S-1.2/NOPB offers superior long-term availability due to its Active status.

Frequently Asked Questions (FAQ)

Q: Can LP3883ES-1.2/NOPB be used as a direct drop-in replacement for LP3883ES-1.2?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB designation indicates lead-free plating, which is compatible with standard PCB assembly processes. No circuit modifications are required.

Q: What are the key differences between LP3883ES-1.2 and LP38843S-1.2/NOPB?

A: The primary differences are dropout voltage (0.42V versus 0.5V @ 3A) and supply current (8 mA versus 40 mA). Both maintain the same 1.2V output, 3A current capacity, and TO-263 package. The LP38843S variant is suitable for applications where these parameter variations fall within acceptable design tolerances.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-263 (DDPAK-5) package with identical pinout and thermal tab configuration. PCB layout and footprints are interchangeable.

Q: Which substitute should be selected for new designs?

A: LP38843S-1.2/NOPB is recommended for new designs due to its Active product status, ensuring long-term availability and manufacturing support from Texas Instruments.

Q: Are there compliance or certification differences between the parts?

A: LP3883ES-1.2 and LP38843S-1.2/NOPB are both ROHS3 compliant and REACH unaffected. All three parts carry EAR99 ECCN classification and HTSUS code 8542.39.0001. Compliance documentation should be verified with the respective manufacturer for specific applications.

Q: What is the moisture sensitivity level for these parts?

A: LP3883ES-1.2 and LP38843S-1.2/NOPB both carry MSL 3 (168 Hours) rating. Standard moisture control procedures during storage and assembly are required.

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