LP3855EMP-2.5 Equivalent & Substitute Parts

Part Overview

The LP3855EMP-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 2.5V output at 1.5A maximum current in a surface-mount SOT-223-5 package. The device is marked as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal performance while meeting modern compliance standards.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	1.5A
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.44V @ 1.5A
Quiescent Current (Iq)	3 mA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-5 (TO-261-5, TO-261AB)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3855EMP-2.5 are grouped based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Fixed output voltage of 2.5V
Output current rating of 1.5A
Maximum input voltage of 7V
SOT-223-5 package configuration
Surface-mount mounting type
Operating temperature range of -40°C to 125°C
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Acceptable Parameter Variations:

Dropout voltage up to 0.55V @ 1.5A (versus 0.44V for the main part)
Quiescent current up to 9 mA (versus 3 mA for the main part)
Supply current up to 15 mA (versus 10 mA for the main part)
Packaging format variations (Bulk, Tape & Reel, Cut Tape)
Product status transition from Obsolete to Active

Parts meeting these criteria are electrically interchangeable in applications where the specified parameter tolerances are acceptable.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage @ 1.5A	Quiescent Current	Supply Current (Max)	Package	Product Status	RoHS Status
LP3855EMP-2.5	Texas Instruments	2.5V	1.5A	0.44V	3 mA	10 mA	SOT-223-5	Obsolete	Non-compliant
LP3852EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	0.44V	3 mA	10 mA	SOT-223-5	Active	ROHS3 Compliant
LP3855EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	0.44V	3 mA	10 mA	SOT-223-5	Active	ROHS3 Compliant
LP3872EMP-2.5/NOPB	National Semiconductor	2.5V	1.5A	0.55V	5 mA	15 mA	SOT-223	Active	Not specified
LP3872EMPX-2.5/NOPB	National Semiconductor	2.5V	1.5A	0.55V	5 mA	15 mA	SOT-223	Active	Not specified
LP3875EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	0.55V	5 mA	15 mA	SOT-223-5	Active	ROHS3 Compliant
LP3962EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	0.55V	9 mA	15 mA	SOT-223-5	Active	ROHS3 Compliant
LP3965EMP-2.5/NOPB	Texas Instruments	2.5V	1.5A	0.55V	9 mA	15 mA	SOT-223-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended): LP3852EMP-2.5/NOPB and LP3855EMP-2.5/NOPB are the preferred substitutes. Both are Texas Instruments products with identical electrical specifications to the main part (0.44V dropout voltage, 3 mA quiescent current) and are ROHS3 compliant with Active product status. These parts provide seamless integration into existing designs without performance degradation.

Tier 2 - Compatible Substitutes: LP3875EMP-2.5/NOPB, LP3962EMP-2.5/NOPB, and LP3965EMP-2.5/NOPB are Texas Instruments products with slightly elevated dropout voltage (0.55V) and quiescent current specifications. All three are ROHS3 compliant and Active. These parts are suitable for applications where the increased power dissipation from higher dropout voltage is acceptable.

Tier 3 - Alternative Substitutes: LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB are National Semiconductor products meeting the core electrical requirements. Both feature 0.55V dropout voltage and 5 mA quiescent current. These parts are Active but lack specified RoHS compliance documentation. Use only when Tier 1 and Tier 2 options are unavailable.

Compliance Consideration: All substitute parts are REACH Unaffected. The main part (LP3855EMP-2.5) is RoHS non-compliant. All recommended substitutes achieve ROHS3 compliance, supporting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can LP3855EMP-2.5/NOPB replace the obsolete LP3855EMP-2.5? A: Yes. LP3855EMP-2.5/NOPB is the active production equivalent with identical electrical specifications and SOT-223-5 packaging. The /NOPB suffix indicates halogen-free lead-free construction and ROHS3 compliance.

Q: What is the difference between LP3852EMP-2.5/NOPB and LP3855EMP-2.5/NOPB? A: Both parts are electrically identical with 0.44V dropout voltage and 3 mA quiescent current. The difference lies in the base product number (LP3852 versus LP3855). Both are suitable direct replacements for the obsolete LP3855EMP-2.5.

Q: Why do some substitutes have higher dropout voltage (0.55V vs 0.44V)? A: LP3875EMP-2.5/NOPB, LP3962EMP-2.5/NOPB, and LP3965EMP-2.5/NOPB represent different design generations with slightly higher dropout voltage. This increases power dissipation but maintains the 1.5A output current and 2.5V fixed output. Use these only if thermal budget permits.

Q: Are National Semiconductor parts (LP3872) acceptable substitutes? A: LP3872EMP-2.5/NOPB and LP3872EMPX-2.5/NOPB meet core electrical requirements and are Active products. However, RoHS compliance status is not specified. Prioritize Texas Instruments alternatives unless supply constraints require National Semiconductor parts.

Q: Does packaging format affect substitution? A: All substitute parts use SOT-223-5 or SOT-223 packages with identical pin configurations (TO-261-5, TO-261AB). Packaging format variations (Bulk, Tape & Reel, Cut Tape) do not affect electrical compatibility, only procurement and handling logistics.

Q: What is the impact of higher quiescent current in LP3962EMP-2.5/NOPB and LP3965EMP-2.5/NOPB? A: Quiescent current increases from 3 mA to 9 mA. This affects standby power consumption but does not impact active load regulation or output current capacity. Use these parts only in applications where standby power dissipation is not a constraint.

Q: Are all substitutes suitable for -40°C to 125°C operation? A: Yes. All substitute parts maintain the full -40°C to 125°C operating temperature range with identical thermal protection (Over Temperature, Over Current, Short Circuit).

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