LP3874ES-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3874ES-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 800mA output current in a TO-263 (DDPAK-5) package configuration. The part is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Base Product Number	LP3874
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Current - Output	800mA
Voltage - Input (Max)	7V
Voltage - Output (Min/Fixed)	1.2V
Voltage - Output (Max)	6.6V
Voltage Dropout (Max)	0.35V @ 800mA
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C

Substitute Part Grouping Explanation

Substitute parts for the LP3874ES-ADJ are identified based on strict electrical and mechanical parameter matching within the LP3874 product family. The substitution criteria are:

Identical base product number (LP3874)
Matching output configuration (Positive)
Matching output type (Adjustable)
Identical current rating (800mA)
Identical voltage specifications (Input Max: 7V, Output Min: 1.2V, Output Max: 6.6V)
Identical package type (TO-263 DDPAK-5)
Identical mounting type (Surface Mount)
Identical operating temperature range (-40°C ~ 125°C)

The substitute parts differ only in product status (Active vs. Obsolete), RoHS compliance level, and packaging format (Tube vs. Tape & Reel), which do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	LP3874ES-ADJ	LP3874ES-ADJ/NOPB	LP3874ESX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Current - Output	800mA	800mA	800mA
Voltage - Input (Max)	7V	7V	7V
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.2V
Voltage - Output (Max)	6.6V	6.6V	6.6V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Current - Quiescent (Iq)	9 mA	9 mA	9 mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Package / Case	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
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Standard	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

Both LP3874ES-ADJ/NOPB and LP3874ESX-ADJ/NOPB are direct electrical and mechanical equivalents to the LP3874ES-ADJ. Selection between these alternatives should be based on the following factors:

Product Status: The LP3874ES-ADJ is Obsolete. Both substitute parts carry Active product status, ensuring long-term availability and continued manufacturer support.

Compliance: The LP3874ES-ADJ is RoHS non-compliant. Both substitute parts are ROHS3 Compliant, meeting current regulatory requirements for electronic components in regulated markets.

Packaging Format: LP3874ES-ADJ/NOPB is supplied in Tube packaging, suitable for lower-volume applications and manual assembly processes. LP3874ESX-ADJ/NOPB is supplied in Tape & Reel format, optimized for high-volume automated assembly operations.

For new designs or production transitions, either substitute part provides full electrical and mechanical compatibility with identical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Are LP3874ES-ADJ/NOPB and LP3874ESX-ADJ/NOPB electrically identical to LP3874ES-ADJ?

A: Yes. Both substitute parts are electrically identical. They share identical output configuration, voltage specifications, current ratings, dropout voltage, quiescent current, PSRR, and protection features. The only differences are product status, RoHS compliance level, and packaging format.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging supplies components in plastic tubes, typically used for lower-volume orders and manual assembly. Tape & Reel packaging supplies components on continuous tape wound on reels, optimized for automated pick-and-place assembly equipment in high-volume manufacturing.

Q: Can I use LP3874ES-ADJ/NOPB or LP3874ESX-ADJ/NOPB as direct replacements in existing designs?

A: Yes. Both parts are pin-compatible and functionally equivalent. No circuit modifications are required. The TO-263 DDPAK-5 package pinout and electrical performance are identical across all three part numbers.

Q: Why is the original LP3874ES-ADJ marked as Obsolete?

A: The Obsolete status indicates that Texas Instruments has discontinued this specific part number variant. The base LP3874 product family remains active through the substitute part numbers, which incorporate updated compliance certifications and packaging options.

Q: Are there any thermal or performance differences between these parts?

A: No. All three parts share identical thermal characteristics, operating temperature range (-40°C ~ 125°C), and electrical performance specifications including dropout voltage and quiescent current.

Q: Which substitute part should I select for new production?

A: Selection depends on your manufacturing process. For automated assembly, LP3874ESX-ADJ/NOPB (Tape & Reel) is standard. For lower-volume or manual assembly, LP3874ES-ADJ/NOPB (Tube) is appropriate. Both are ROHS3 Compliant and Active products.

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