LP3855ES-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP3855ES-1.8/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 1.8V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. The device features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

The LP3855ES-1.8/NOPB maintains Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and functional equivalence within the 1.8V fixed output regulator category.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP3855ES-1.8/NOPB
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.8V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.38V @ 1.5A
Quiescent Current	3 mA
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the LP3855ES-1.8/NOPB are categorized based on the following substitution criteria:

Primary Substitution Parameters:

Fixed output voltage of 1.8V
Output current rating of 1.5A
TO-263 (DDPAK-5) package compatibility
Surface mount mounting type
Enable control feature
Operating temperature range of -40°C to 125°C
Overcurrent and overtemperature protection

Manufacturer Recommended Substitutes are parts explicitly recommended by Texas Instruments as direct replacements, though they may have different product status or input voltage ratings.

Parametric Equivalents are parts that match the core electrical specifications and package requirements of the LP3855ES-1.8/NOPB, with variations in secondary parameters such as quiescent current, supply current, or PSRR performance.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 1.5A	Quiescent Current	Package	Product Status	RoHS Status
LP3855ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.38V	3 mA	TO-263-6	Active	ROHS3 Compliant
TL1963A-18KTTR	Texas Instruments	1.8V	1.5A	20V	0.55V	1 mA	TO-263-6	Obsolete	ROHS3 Compliant
TPS7A4518KTTRG3	Texas Instruments	1.8V	1.5A	20V	0.45V	1.5 mA	TO-263-6	Active	ROHS3 Compliant
LP3852ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.38V	3 mA	TO-263-6	Active	ROHS3 Compliant
LP3872ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	5 mA	TO-263-6	Active	ROHS3 Compliant
LP3962ES-1.8/NOPB	Texas Instruments	1.8V	1.5A	7V	0.55V	9 mA	TO-263-6	Active	ROHS3 Compliant
LP3872ES-1.8	Texas Instruments	1.8V	1.5A	7V	0.55V	5 mA	TO-263-6	Not For New Designs	RoHS non-compliant

Engineering Selection Recommendations

For Active Product Status Applications: The LP3852ES-1.8/NOPB and LP3872ES-1.8/NOPB are parametric equivalents with Active product status and ROHS3 compliance. LP3852ES-1.8/NOPB matches the LP3855ES-1.8/NOPB in dropout voltage (0.38V) and quiescent current (3 mA), making it the closest functional equivalent. LP3872ES-1.8/NOPB offers higher quiescent current (5 mA) but maintains the same output specifications.

LP3962ES-1.8/NOPB is functionally equivalent with Active status and ROHS3 compliance, though it exhibits higher quiescent current (9 mA).

For Extended Input Voltage Range Applications: TPS7A4518KTTRG3 is an Active product with ROHS3 compliance that accepts input voltages up to 20V, compared to the 7V maximum of the LP3855ES-1.8/NOPB. This part is suitable for applications requiring higher input voltage tolerance while maintaining 1.8V fixed output at 1.5A.

TL1963A-18KTTR also supports 20V input but carries Obsolete product status, making it unsuitable for new designs despite ROHS3 compliance.

Parts to Avoid for New Designs: LP3872ES-1.8 (without /NOPB suffix) is marked as Not For New Designs and is RoHS non-compliant. This part should not be selected for new product development.

Frequently Asked Questions (FAQ)

Q: Can I use TPS7A4518KTTRG3 as a direct replacement for LP3855ES-1.8/NOPB?

A: TPS7A4518KTTRG3 is functionally compatible for the core 1.8V, 1.5A output specification and TO-263 package. The primary difference is the higher maximum input voltage (20V vs. 7V). If your application requires input voltages above 7V, TPS7A4518KTTRG3 is suitable. Both parts are Active and ROHS3 compliant. Verify your circuit's input voltage requirements before selection.

Q: What is the difference between LP3852ES-1.8/NOPB and LP3872ES-1.8/NOPB?

A: Both are parametric equivalents to LP3855ES-1.8/NOPB with identical output voltage (1.8V) and current (1.5A). LP3852ES-1.8/NOPB has lower quiescent current (3 mA) and lower dropout voltage (0.38V), matching the original part exactly. LP3872ES-1.8/NOPB has higher quiescent current (5 mA) and higher dropout voltage (0.55V). Select LP3852ES-1.8/NOPB for lowest power consumption; select LP3872ES-1.8/NOPB if quiescent current is not a constraint.

Q: Why is TL1963A-18KTTR listed as a substitute if it is Obsolete?

A: TL1963A-18KTTR is included as a manufacturer-recommended substitute for reference purposes. However, its Obsolete status makes it unsuitable for new designs. Use this part only for legacy system maintenance or repair where existing inventory exists.

Q: Are all substitute parts available in the same packaging?

A: All listed substitute parts use the TO-263-6 (D2PAK with 5 Leads + Tab) package, ensuring mechanical and electrical pin compatibility. Packaging format differences (Tube, Cut Tape, Tape & Reel) do not affect functional compatibility, only procurement and handling methods.

Q: Which substitute part has the lowest power consumption?

A: LP3852ES-1.8/NOPB and the original LP3855ES-1.8/NOPB both have quiescent current of 3 mA, the lowest among all listed parts. For applications where quiescent current is critical, these two parts are equivalent and preferred.

Q: Can I use LP3872ES-1.8 (without /NOPB) in new designs?

A: No. LP3872ES-1.8 is marked as Not For New Designs and is RoHS non-compliant. Use LP3872ES-1.8/NOPB instead, which is Active and ROHS3 compliant.

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