LP3874EMPX-1.8 Equivalent & Substitute Parts

Part Overview

The LP3874EMPX-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 800mA in SOT-223-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides integrated over-current, over-temperature, and short-circuit protection with an enable control feature, suitable for applications requiring low-dropout regulation in compact form factors.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	0.35V @ 800mA
Quiescent Current (Iq)	9 mA
Supply Current (Max)	15 mA
PSRR	73dB ~ 57dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C
Package	SOT-223-5
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP3874EMPX-1.8 is determined by strict equivalence across the following critical parameters: fixed output voltage of 1.8V, output current rating of 800mA, maximum input voltage of 7V, dropout voltage specification of 0.35V @ 800mA, operating temperature range of -40°C to 125°C, SOT-223 package family, and integrated protection features (over-current, over-temperature, short-circuit). All identified substitute parts maintain these electrical and mechanical specifications, ensuring functional compatibility in applications originally designed for the LP3874EMPX-1.8.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout Voltage	Iq (mA)	Package	RoHS Status	Inventory (Pcs)
LP3874EMPX-1.8	Texas Instruments	Obsolete	1.8V	800mA	0.35V @ 800mA	9	SOT-223-5	RoHS non-compliant	2100
LP3874EMPX-1.8/NOPB	Texas Instruments	Active	1.8V	800mA	0.35V @ 800mA	9	SOT-223-5	ROHS3 Compliant	4200
LP3871EMP-1.8/NOPB	National Semiconductor	Active	1.8V	800mA	0.35V @ 800mA	5	SOT-223	Not specified	3550
LP3874EMP-1.8/NOPB	National Semiconductor	Active	1.8V	800mA	0.35V @ 800mA	9	SOT-223	Not specified	3294
LP3961EMP-1.8/NOPB	National Semiconductor	Active	1.8V	800mA	0.35V @ 800mA	9	SOT-223	Not specified	2836
LP3961EMPX-1.8/NOPB	Texas Instruments	Active	1.8V	800mA	0.35V @ 800mA	9	SOT-223-5	ROHS3 Compliant	762
LP3964EMP-1.8/NOPB	Texas Instruments	Active	1.8V	800mA	0.35V @ 800mA	9	SOT-223-5	ROHS3 Compliant	1267

Engineering Selection Recommendations

For new designs and production continuity, LP3874EMPX-1.8/NOPB is the primary recommended substitute. This part maintains identical electrical specifications and package configuration (SOT-223-5) while offering active product status and ROHS3 compliance, addressing the obsolescence of the original LP3874EMPX-1.8.

LP3961EMPX-1.8/NOPB and LP3964EMP-1.8/NOPB are secondary alternatives, both from Texas Instruments with active status and ROHS3 compliance. These parts preserve the SOT-223-5 package specification and all critical electrical parameters.

For applications where National Semiconductor sourcing is acceptable, LP3871EMP-1.8/NOPB offers the lowest quiescent current (5 mA) while maintaining all other critical specifications. LP3874EMP-1.8/NOPB and LP3961EMP-1.8/NOPB from National Semiconductor provide functional equivalence with SOT-223 packaging, though inventory availability should be evaluated against project timelines.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMPX-1.8/NOPB be used as a direct replacement for LP3874EMPX-1.8?

A: Yes. Both parts share identical electrical specifications (1.8V output, 800mA current, 0.35V dropout voltage, -40°C to 125°C operating range) and SOT-223-5 packaging. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between SOT-223-5 and SOT-223 packages?

A: SOT-223-5 is a 5-pin variant of the SOT-223 package family. Parts specified as SOT-223 without the "-5" designation may have different pin configurations. Verify pinout compatibility with your PCB layout before substitution.

Q: Are there quiescent current differences between substitute parts?

A: LP3871EMP-1.8/NOPB has a quiescent current of 5 mA, while all other substitutes maintain 9 mA. This 4 mA difference may be significant in battery-powered or low-power standby applications.

Q: Which substitute offers the best availability?

A: LP3874EMPX-1.8/NOPB has the highest inventory (4200 Pcs), followed by LP3874EMP-1.8/NOPB (3294 Pcs) and LP3871EMP-1.8/NOPB (3550 Pcs).

Q: Do all substitutes meet RoHS compliance requirements?

A: Texas Instruments parts (LP3874EMPX-1.8/NOPB, LP3961EMPX-1.8/NOPB, LP3964EMP-1.8/NOPB) are ROHS3 compliant. National Semiconductor parts do not specify RoHS status in the provided data.

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