LP3856ESX-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3856ESX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 3A current capacity in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated 5V output with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power distribution.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Voltage - Input (Max)	7V
Current - Output	3A
Voltage Dropout (Max)	0.6V @ 3A
Current - Quiescent (Iq)	4 mA
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the LP3856ESX-5.0 are classified based on electrical parameter compatibility within the allowed tolerances for this product category. The primary substitution criteria are:

Output voltage: Fixed 5V
Output current capacity: 3A
Input voltage maximum: 7V
Package type: TO-263 (DDPAK-5) surface mount
Protection features: Over-current, over-temperature, short-circuit protection
Operating temperature range: -40°C ~ 125°C

Substitutes are grouped into two categories:

Direct Manufacturer Equivalent: LP3856ESX-5.0/NOPB maintains identical electrical specifications and differs only in packaging format (Tape & Reel) and product status (Active vs. Obsolete).

Parametric Equivalents: LP3853ESX-5.0/NOPB and LP3873ESX-5.0/NOPB share the same output voltage, current capacity, input voltage maximum, package type, and protection features. Variations exist in voltage dropout and quiescent current specifications, which remain within acceptable operating parameters for equivalent functionality.

Parameter Comparison

Parameter	LP3856ESX-5.0	LP3856ESX-5.0/NOPB	LP3853ESX-5.0/NOPB	LP3873ESX-5.0/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Output Voltage (Fixed)	5V	5V	5V	5V
Input Voltage (Max)	7V	7V	7V	7V
Output Current	3A	3A	3A	3A
Voltage Dropout (Max)	0.6V @ 3A	0.6V @ 3A	0.6V @ 3A	1.2V @ 3A
Quiescent Current (Iq)	4 mA	4 mA	4 mA	9 mA
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

LP3856ESX-5.0/NOPB is the primary direct equivalent for the obsolete LP3856ESX-5.0. This part maintains identical electrical specifications and is currently in active production status. The primary distinction is RoHS3 compliance, making it suitable for applications requiring modern regulatory compliance. Packaging is supplied in Tape & Reel format with 782 units in current inventory.

LP3853ESX-5.0/NOPB serves as a parametric equivalent with identical voltage dropout and quiescent current specifications to the original part. This device is actively produced with 2000 units in inventory and carries ROHS3 compliance certification. Electrical performance is equivalent across all critical parameters.

LP3873ESX-5.0/NOPB is a parametric equivalent with increased voltage dropout (1.2V @ 3A versus 0.6V @ 3A) and higher quiescent current (9 mA versus 4 mA). This part is suitable for applications where these parameter variations do not impact system performance. The device is actively produced with 1942 units in inventory and carries ROHS3 compliance certification.

All substitute parts share identical package type, mounting configuration, and protection feature sets. Selection should be based on product availability, compliance requirements, and specific application tolerance for voltage dropout and quiescent current variations.

Frequently Asked Questions (FAQ)

Q: Can LP3856ESX-5.0/NOPB be used as a direct replacement for LP3856ESX-5.0?

A: Yes. LP3856ESX-5.0/NOPB is the direct manufacturer equivalent with identical electrical specifications. The primary differences are product status (Active vs. Obsolete) and RoHS compliance level. Packaging format differs (Tape & Reel vs. bulk), but electrical performance and pinout are equivalent.

Q: What is the difference between LP3853ESX-5.0/NOPB and LP3873ESX-5.0/NOPB?

A: Both are parametric equivalents with identical output voltage, current capacity, and input voltage specifications. LP3853ESX-5.0/NOPB maintains the original voltage dropout (0.6V @ 3A) and quiescent current (4 mA). LP3873ESX-5.0/NOPB has higher voltage dropout (1.2V @ 3A) and quiescent current (9 mA). Selection depends on application tolerance for these parameters.

Q: Are all substitute parts in the same package?

A: Yes. All parts use the TO-263-6 (D2PAK with 5 Leads + Tab) surface mount package. Pin configuration and PCB footprint compatibility are maintained across all substitutes.

Q: What is the significance of RoHS compliance differences?

A: The original LP3856ESX-5.0 is RoHS non-compliant. All substitute parts (LP3856ESX-5.0/NOPB, LP3853ESX-5.0/NOPB, LP3873ESX-5.0/NOPB) are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the compliant substitutes are required.

Q: Which substitute has the best availability?

A: LP3853ESX-5.0/NOPB has the highest inventory level at 2000 units. LP3873ESX-5.0/NOPB has 1942 units, and LP3856ESX-5.0/NOPB has 782 units in current stock.

Q: Can I use LP3873ESX-5.0/NOPB if my application requires low quiescent current?

A: No. LP3873ESX-5.0/NOPB has a quiescent current of 9 mA compared to 4 mA for the original part. For applications with strict quiescent current requirements, use LP3856ESX-5.0/NOPB or LP3853ESX-5.0/NOPB.

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