LP3855EMPX-5.0 Equivalent & Substitute Parts

Part Overview

The LP3855EMPX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 1.5A in SOT-223-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The device provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable 5V power delivery in compact form factors.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	5V
Voltage - Input (Max)	7V
Current - Output	1.5A
Voltage Dropout (Max)	0.44V @ 1.5A
Current - Quiescent (Iq)	3 mA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
PSRR	73dB ~ 57dB (120Hz)

Substitute Part Grouping Explanation

Substitute parts for the LP3855EMPX-5.0 are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Output voltage: 5V fixed
Output current capability: 1.5A
Input voltage maximum: 7V
Package type: SOT-223-5 or equivalent TO-261-5/TO-261AB
Surface mount configuration
Protection features: Over-current, over-temperature, short-circuit

Substitution Categories:

Direct Equivalent (Pin-Compatible, Identical Electrical Performance): LP3855EMPX-5.0/NOPB meets all electrical and mechanical specifications identically to the main part, with the distinction of active product status and RoHS3 compliance.

Parametric Equivalents (Functionally Compatible with Minor Variations): LP3855EMP-5.0/NOPB, LP3852EMP-5.0/NOPB, LP3875EMP-5.0/NOPB, and LP3872EMP-5.0/NOPB share the core electrical specifications (5V output, 1.5A capability, 7V max input, SOT-223-5 package) with documented variations in dropout voltage and quiescent current that remain within acceptable operating ranges for equivalent applications.

Parameter Comparison

Parameter	LP3855EMPX-5.0	LP3855EMPX-5.0/NOPB	LP3855EMP-5.0/NOPB	LP3852EMP-5.0/NOPB	LP3872EMP-5.0/NOPB	LP3875EMP-5.0/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Output Voltage (Fixed)	5V	5V	5V	5V	5V	5V
Current - Output	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A
Voltage - Input (Max)	7V	7V	7V	7V	7V	7V
Voltage Dropout (Max)	0.44V @ 1.5A	0.44V @ 1.5A	0.44V @ 1.5A	0.44V @ 1.5A	0.55V @ 1.5A	0.55V @ 1.5A
Current - Quiescent (Iq)	3 mA	3 mA	3 mA	3 mA	5 mA	5 mA
Current - Supply (Max)	10 mA	10 mA	10 mA	10 mA	15 mA	15 mA
Package / Case	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5	SOT-223-5	SOT-223-5	SOT-223-5	SOT-223	SOT-223-5
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	Not specified	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: LP3855EMPX-5.0/NOPB

This part is the direct equivalent with identical electrical specifications and active product status. It provides ROHS3 compliance and maintains all performance characteristics of the obsolete LP3855EMPX-5.0. Selection of this part eliminates obsolescence risk while preserving design compatibility.

Secondary Recommendations: LP3855EMP-5.0/NOPB

This part maintains identical electrical performance to the primary recommendation with active product status and ROHS3 compliance. Packaging is specified as Tape & Reel (TR), suitable for high-volume production environments.

Alternative Selections: LP3852EMP-5.0/NOPB, LP3875EMP-5.0/NOPB, LP3872EMP-5.0/NOPB

These parts share core electrical specifications with documented parameter variations. LP3852EMP-5.0/NOPB and LP3875EMP-5.0/NOPB exhibit increased dropout voltage (0.55V vs. 0.44V) and quiescent current (5 mA vs. 3 mA). LP3872EMP-5.0/NOPB is manufactured by National Semiconductor with similar parameter variations. These alternatives remain functionally compatible for applications where the specified parameter variations do not impact system performance. All maintain 1.5A output capability, 5V fixed output, and SOT-223 package compatibility.

Compliance Considerations:

Parts with ROHS3 compliance status (LP3855EMPX-5.0/NOPB, LP3855EMP-5.0/NOPB, LP3852EMP-5.0/NOPB, LP3875EMP-5.0/NOPB) are preferred for applications subject to RoHS regulations. The original LP3855EMPX-5.0 is RoHS non-compliant and obsolete, necessitating substitution for new designs and ongoing compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3855EMPX-5.0/NOPB be used as a direct replacement for LP3855EMPX-5.0?

A: Yes. LP3855EMPX-5.0/NOPB is electrically and mechanically identical to LP3855EMPX-5.0, with the primary differences being active product status and ROHS3 compliance. Pin configuration, package type (SOT-223-5), and all electrical specifications are identical.

Q: What is the difference between LP3855EMP-5.0/NOPB and LP3855EMPX-5.0/NOPB?

A: Both parts share identical electrical specifications and are manufactured by Texas Instruments. The primary distinction is packaging format: LP3855EMPX-5.0/NOPB is specified as Tape & Reel (TR), while LP3855EMP-5.0/NOPB is also Tape & Reel (TR). Both maintain SOT-223-5 package compatibility and active product status.

Q: Why do LP3872EMP-5.0/NOPB and LP3875EMP-5.0/NOPB have higher dropout voltage and quiescent current?

A: These parts exhibit documented parameter variations (0.55V dropout vs. 0.44V, 5 mA quiescent current vs. 3 mA) while maintaining identical output voltage (5V), output current (1.5A), and package configuration (SOT-223). These variations reflect different internal circuit design approaches within the same functional category. Selection depends on whether the application can accommodate the increased dropout voltage and quiescent current without performance degradation.

Q: Is LP3872EMP-5.0/NOPB from National Semiconductor compatible with Texas Instruments designs?

A: LP3872EMP-5.0/NOPB maintains functional compatibility through identical output specifications (5V, 1.5A), input voltage rating (7V max), and SOT-223 package configuration. The manufacturer difference (National Semiconductor vs. Texas Instruments) does not affect pin compatibility or electrical performance within the specified parameter ranges. Compliance documentation (RoHS status, REACH status) should be verified for specific application requirements.

Q: What packaging options are available for these substitute parts?

A: LP3855EMPX-5.0/NOPB and LP3855EMP-5.0/NOPB are available in Tape & Reel (TR) packaging. LP3852EMP-5.0/NOPB is available in Cut Tape (CT) & Digi-Reel® format. LP3872EMP-5.0/NOPB is available in Bulk packaging. All maintain SOT-223-5 or SOT-223 device package specifications suitable for surface mount assembly.

Q: Are all substitute parts RoHS compliant?

A: LP3855EMPX-5.0/NOPB, LP3855EMP-5.0/NOPB, LP3852EMP-5.0/NOPB, and LP3875EMP-5.0/NOPB are ROHS3 compliant. LP3872EMP-5.0/NOPB RoHS status is not specified in available documentation. The original LP3855EMPX-5.0 is RoHS non-compliant. For applications requiring RoHS compliance, select from the ROHS3-compliant alternatives.

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