LP3874ES-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP3874ES-1.8/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 800mA in a TO-263 (DDPAK-5) surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The device provides regulated 1.8V output with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power delivery.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	800mA
Input Voltage (Max)	7V
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
Protection Features	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP3874ES-1.8/NOPB are qualified based on the following critical parameters that must match or remain compatible:

Output voltage fixed at 1.8V
Output current capability of 800mA
Maximum input voltage of 7V
Voltage dropout specification of 0.35V @ 800mA
TO-263 (DDPAK-5) package configuration
Surface mount mounting type
Operating temperature range of -40°C ~ 125°C
Integrated protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature

The three qualified substitutes (LP3871ES-1.8/NOPB, LP3961ES-1.8/NOPB, and LP3964ES-1.8/NOPB) meet all these electrical and mechanical requirements, enabling direct replacement in existing designs.

Parameter Comparison

Parameter	LP3874ES-1.8/NOPB	LP3871ES-1.8/NOPB	LP3961ES-1.8/NOPB	LP3964ES-1.8/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Output Voltage	1.8V	1.8V	1.8V	1.8V
Output Current	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	7V	7V	7V
Voltage Dropout (Max)	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA	0.35V @ 800mA
Quiescent Current (Iq)	9 mA	5 mA	9 mA	9 mA
Supply Current (Max)	15 mA	15 mA	15 mA	15 mA
PSRR	73dB ~ 57dB (120Hz)	73dB ~ 57dB (120Hz)	Not specified	Not specified
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)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	Not specified	3 (168 Hours)

Engineering Selection Recommendations

All three substitute parts are active products with full availability, addressing the obsolescence of the LP3874ES-1.8/NOPB. Selection among substitutes should be based on the following criteria:

LP3871ES-1.8/NOPB is recommended for applications where lower quiescent current is beneficial. This part features 5 mA Iq compared to 9 mA in the original design, reducing standby power consumption. It maintains ROHS3 compliance and MSL-3 rating with Tube packaging available.

LP3961ES-1.8/NOPB, manufactured by National Semiconductor, provides an alternative source for supply chain diversification. It matches all critical electrical parameters and protection features, though PSRR specification is not provided in available documentation.

LP3964ES-1.8/NOPB offers continuity with Texas Instruments as the manufacturer while providing active product status. It maintains full ROHS3 compliance, MSL-3 rating, and Tube packaging, with availability of 784 pieces in stock.

All three substitutes are pin-compatible in the TO-263 (DDPAK-5) package and require no circuit modifications for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can LP3871ES-1.8/NOPB be used as a direct replacement for LP3874ES-1.8/NOPB?

A: Yes. Both parts share identical output voltage (1.8V), output current (800mA), input voltage rating (7V), voltage dropout (0.35V @ 800mA), package configuration (TO-263 DDPAK-5), and protection features. The LP3871ES-1.8/NOPB features lower quiescent current (5 mA vs 9 mA), which is a performance improvement. No circuit modifications are required.

Q: What is the difference between LP3961ES-1.8/NOPB and the other substitutes?

A: LP3961ES-1.8/NOPB is manufactured by National Semiconductor rather than Texas Instruments. It meets all critical electrical specifications and package requirements. PSRR specification is not documented for this part. It is suitable for applications where manufacturer diversification is acceptable.

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

A: LP3871ES-1.8/NOPB and LP3964ES-1.8/NOPB are available in Tube packaging. LP3961ES-1.8/NOPB packaging information is not specified in available data. All three are surface mount components in the TO-263 (DDPAK-5) package configuration.

Q: Do all substitutes meet RoHS and MSL requirements?

A: LP3871ES-1.8/NOPB and LP3964ES-1.8/NOPB are ROHS3 compliant with MSL-3 (168 Hours) rating. LP3961ES-1.8/NOPB compliance information is not specified in available documentation. Verify compliance requirements with your specific application standards before selection.

Q: What is the primary reason to use a substitute for LP3874ES-1.8/NOPB?

A: The LP3874ES-1.8/NOPB is classified as obsolete. All three substitute parts are active products with confirmed current availability, ensuring long-term supply chain continuity for new designs and production.

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