LP3893ESX-1.2 Equivalent & Substitute Parts

Part Overview

The LP3893ESX-1.2 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed positive 1.2V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3893ESX-1.2
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.2V
Voltage - Input (Max)	5.5V
Current - Output	3A
Voltage Dropout (Max)	1V @ 1A
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP3893ESX-1.2 are identified based on strict electrical and mechanical parameter matching within the linear voltage regulator category. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output voltage: 1.2V fixed
Maximum output current: 3A
Input voltage range: 5.5V maximum
Package type: TO-263 (DDPAK-5) surface mount
Output configuration: Positive fixed
Protection features: Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
Control features: Enable function
Operating temperature range: -40°C ~ 125°C

Identified Substitute Parts:

LP38856SX-1.2/NOPB (Texas Instruments) – Active product status
LP3893ESX-1.2/NOPB (National Semiconductor) – Active product status

Parameter Comparison

Parameter	LP3893ESX-1.2	LP38856SX-1.2/NOPB	LP3893ESX-1.2/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor
Product Status	Obsolete	Active	Active
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.2V
Voltage - Input (Max)	5.5V	5.5V	5.5V
Current - Output	3A	3A	3A
Voltage Dropout (Max)	1V @ 1A	0.45V @ 3A	1V @ 1A
Current - Quiescent (Iq)	30 µA	300 µA	30 µA
Current - Supply (Max)	8 mA	15 mA	8 mA
PSRR	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified
Inventory Status	1862 Pcs New Original In Stock	3100 Pcs New Original In Stock	52588 Pcs New Original In Stock

Engineering Selection Recommendations

LP38856SX-1.2/NOPB (Texas Instruments)

This part is an active product with ROHS3 compliance, addressing regulatory requirements that the obsolete LP3893ESX-1.2 does not meet. The LP38856SX-1.2/NOPB maintains identical output voltage, current rating, and package configuration. The improved dropout voltage specification (0.45V @ 3A versus 1V @ 1A) represents enhanced performance characteristics. Higher quiescent current (300 µA versus 30 µA) and supply current (15 mA versus 8 mA) are the primary electrical differences. This part is suitable for new designs requiring RoHS3 compliance and improved thermal performance.

LP3893ESX-1.2/NOPB (National Semiconductor)

This part maintains identical electrical specifications to the original LP3893ESX-1.2, including quiescent current (30 µA) and supply current (8 mA). Product status is active with substantial inventory availability (52588 pcs). This part provides direct functional equivalence with the obsolete component. RoHS compliance status is not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can LP38856SX-1.2/NOPB directly replace LP3893ESX-1.2 in existing designs?

A: Yes. Both parts share identical output voltage (1.2V), output current (3A), input voltage range (5.5V max), package type (TO-263 DDPAK-5), and operating temperature range (-40°C ~ 125°C). The LP38856SX-1.2/NOPB offers improved dropout voltage performance and RoHS3 compliance. Quiescent and supply current specifications differ; verify these parameters against your circuit requirements.

Q: Can LP3893ESX-1.2/NOPB directly replace LP3893ESX-1.2 in existing designs?

A: Yes. This part is electrically and mechanically identical to the original LP3893ESX-1.2, with matching quiescent current (30 µA), supply current (8 mA), and dropout voltage specifications (1V @ 1A). The primary difference is active product status and higher inventory availability.

Q: What are the key differences between the two substitute parts?

A: LP38856SX-1.2/NOPB features lower dropout voltage (0.45V @ 3A) and RoHS3 compliance but has higher quiescent current (300 µA) and supply current (15 mA). LP3893ESX-1.2/NOPB maintains the original electrical specifications including lower quiescent current (30 µA) and supply current (8 mA).

Q: Are package dimensions identical across all three parts?

A: Yes. All three parts use TO-263-6 (D2PAK with 5 Leads + Tab) surface mount packaging, ensuring mechanical compatibility in PCB layouts.

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

A: Selection depends on design priorities. For RoHS3 compliance and improved dropout voltage performance, select LP38856SX-1.2/NOPB. For electrical specification equivalence to the original part, select LP3893ESX-1.2/NOPB.

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