LP3874EMP-1.8 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP3874EMP-1.8 is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 1.8V output at 800mA in a SOT-223-5 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, along with an enable control feature for power management applications.

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
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-5
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP3874EMP-1.8 are qualified based on the following critical parameters that determine functional equivalence:

Fixed output voltage of 1.8V
Output current capability of 800mA
Maximum input voltage of 7V
Dropout voltage specification of 0.35V @ 800mA
Operating temperature range of -40°C to 125°C
Surface mount package compatibility (SOT-223 or SOT-223-5)
Integrated protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature availability

Parts meeting these electrical and mechanical specifications are classified as parametric equivalents. Packaging variations (Tape & Reel versus Bulk) and product status differences (Active versus Obsolete) do not affect functional substitution capability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Iq (mA)	Package	Product Status	Inventory (Pcs)
LP3874EMP-1.8	Texas Instruments	1.8V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Obsolete	1320
LP3874EMP-1.8/NOPB	National Semiconductor	1.8V	800mA	7V	0.35V @ 800mA	9	SOT-223	Active	3294
LP3871EMP-1.8/NOPB	National Semiconductor	1.8V	800mA	7V	0.35V @ 800mA	5	SOT-223	Active	3550
LP3874EMPX-1.8/NOPB	Texas Instruments	1.8V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	4200
LP3961EMP-1.8/NOPB	National Semiconductor	1.8V	800mA	7V	0.35V @ 800mA	9	SOT-223	Active	2836
LP3961EMPX-1.8/NOPB	Texas Instruments	1.8V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	762
LP3964EMP-1.8/NOPB	Texas Instruments	1.8V	800mA	7V	0.35V @ 800mA	9	SOT-223-5	Active	1267

Engineering Selection Recommendations

For applications currently using the obsolete LP3874EMP-1.8, the following selection criteria apply:

Direct Package Match (SOT-223-5): LP3874EMPX-1.8/NOPB, LP3961EMPX-1.8/NOPB, and LP3964EMP-1.8/NOPB maintain identical package geometry and pin configuration. These parts are manufactured by Texas Instruments and carry Active product status with RoHS3 compliance certification.

Alternative Package (SOT-223): LP3874EMP-1.8/NOPB, LP3871EMP-1.8/NOPB, and LP3961EMP-1.8/NOPB are manufactured by National Semiconductor with Active product status. These parts use SOT-223 packaging, which requires PCB layout verification for pin compatibility despite maintaining electrical equivalence.

Quiescent Current Consideration: LP3871EMP-1.8/NOPB operates with reduced quiescent current of 5mA compared to the 9mA specification of the main part and other substitutes. This characteristic may provide power efficiency benefits in battery-powered or low-power standby applications.

Compliance Status: All substitute parts listed carry either RoHS3 compliance or REACH Unaffected status, suitable for modern manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can LP3874EMPX-1.8/NOPB be used as a direct replacement for LP3874EMP-1.8?

A: Yes. Both parts share identical electrical specifications (1.8V output, 800mA current, 0.35V dropout voltage) and package type (SOT-223-5). The primary difference is product status (Active versus Obsolete) and packaging format (Tape & Reel versus Tape & Reel). No circuit modifications are required.

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

A: SOT-223-5 is a five-pin variant of the SOT-223 package family. Both maintain the same thermal and electrical characteristics for this regulator application. PCB footprint compatibility must be verified during design transition, as pin pitch and lead geometry may differ slightly between variants.

Q: Is LP3871EMP-1.8/NOPB suitable for my application if I need to minimize quiescent current?

A: LP3871EMP-1.8/NOPB operates with 5mA quiescent current versus 9mA for the original part. All other electrical parameters remain equivalent. This part is suitable for applications where reduced standby power consumption is a design requirement.

Q: Are all substitute parts RoHS compliant?

A: LP3874EMPX-1.8/NOPB, LP3961EMPX-1.8/NOPB, and LP3964EMP-1.8/NOPB carry RoHS3 compliance certification. LP3874EMP-1.8/NOPB, LP3871EMP-1.8/NOPB, and LP3961EMP-1.8/NOPB are listed as REACH Unaffected. Verify compliance requirements for your specific manufacturing or end-market application.

Q: Can I use National Semiconductor parts interchangeably with Texas Instruments parts?

A: Yes, from an electrical and functional standpoint. All listed parts meet the same output voltage, current, dropout voltage, and protection specifications. Verify manufacturer datasheets for any minor timing or control feature differences before final design release.

Q: Which substitute part has the highest inventory availability?

A: LP3874EMPX-1.8/NOPB maintains the highest inventory level at 4200 pieces, followed by LP3871EMP-1.8/NOPB at 3550 pieces. Inventory levels should be confirmed with your component supplier for current availability.

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