LP38856S-1.2 Equivalent & Substitute Parts

Part Overview

The LP38856S-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 0.45V at full load. The device integrates protection features including over-current, over-temperature, short-circuit, and under-voltage lockout (UVLO) protection, with an enable control feature for flexible power management applications.

The LP38856S-1.2 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently utilizing this regulator.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.2V
Output Current	3A
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.45V @ 3A
Quiescent Current	300 µA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit, UVLO

Substitute Part Grouping Explanation

Substitute parts for the LP38856S-1.2 are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Fixed output voltage of 1.2V
Output current capability of 3A
Maximum input voltage of 5.5V
Identical package type: TO-263 (DDPAK-5)
Operating temperature range: -40°C to 125°C
Presence of enable control and core protection features (over-current, over-temperature, short-circuit, UVLO)

Two substitute parts meet these criteria: LP38856S-1.2/NOPB (direct manufacturer variant) and LP3893ES-1.2/NOPB (parametric equivalent from the same manufacturer series).

Parameter Comparison

Parameter	LP38856S-1.2	LP38856S-1.2/NOPB	LP3893ES-1.2/NOPB
Manufacturer	Texas Instruments	Texas Instruments	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)	0.45V @ 3A	0.45V @ 3A	1V @ 1A
Quiescent Current	300 µA	300 µA	30 µA
Supply Current (Max)	15 mA	15 mA	8 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
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LP38856S-1.2/NOPB is the direct manufacturer variant of the obsolete LP38856S-1.2. It maintains identical electrical specifications and dropout voltage performance while offering active product status and ROHS3 compliance. This part is the primary recommendation for direct replacement in existing designs.

LP3893ES-1.2/NOPB is a parametric equivalent that delivers the same fixed 1.2V output at 3A with identical package compatibility. This part features improved quiescent current performance (30 µA versus 300 µA) and lower supply current (8 mA versus 15 mA), resulting in reduced power consumption during standby operation. However, the dropout voltage specification differs: 1V @ 1A versus 0.45V @ 3A. This part is suitable for applications where lower standby power consumption is beneficial and dropout voltage at reduced load currents is acceptable. Both substitute parts carry ROHS3 compliance and active product status, ensuring long-term supply availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can LP38856S-1.2/NOPB be used as a direct replacement for LP38856S-1.2?

A: Yes. LP38856S-1.2/NOPB is the active production variant of the same base product (LP38856). It maintains identical electrical specifications, including the 0.45V dropout voltage at 3A, and uses the same TO-263 (DDPAK-5) package. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant).

Q: What is the key difference between LP38856S-1.2/NOPB and LP3893ES-1.2/NOPB?

A: Both parts deliver 1.2V at 3A in the same TO-263 package. LP3893ES-1.2/NOPB offers lower quiescent current (30 µA versus 300 µA) and lower supply current (8 mA versus 15 mA), making it more efficient for low-power standby applications. However, its dropout voltage specification is 1V @ 1A, compared to 0.45V @ 3A for LP38856S-1.2/NOPB. Selection depends on whether dropout voltage performance at full load or standby power consumption is the priority.

Q: Are both substitute parts compatible with the original TO-263 (DDPAK-5) footprint?

A: Yes. Both LP38856S-1.2/NOPB and LP3893ES-1.2/NOPB use the TO-263 (DDPAK-5) package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for LP38856S-1.2.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both LP38856S-1.2/NOPB and LP3893ES-1.2/NOPB are ROHS3 compliant and carry active product status, ensuring compliance with current environmental regulations and long-term supply chain support.

Q: Which substitute part should be selected for new designs?

A: LP38856S-1.2/NOPB is recommended for new designs requiring identical electrical performance to the original LP38856S-1.2. LP3893ES-1.2/NOPB is suitable for applications prioritizing reduced standby power consumption, provided the dropout voltage specification at reduced load currents meets design requirements.

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