LP3881ES-1.2 Equivalent & Substitute Parts

Part Overview

The LP3881ES-1.2 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 1.2V at 800mA with a maximum dropout voltage of 0.16V, housed in a TO-263 (DDPAK-5) surface mount package. The main part number LP3881ES-1.2 is currently listed as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.2V
Voltage - Input (Max)	5.5V
Current - Output	800mA
Voltage Dropout (Max)	0.16V @ 800mA
Current - Quiescent (Iq)	30 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP3881ES-1.2 is determined by strict equivalence across the following critical parameters:

Output voltage: 1.2V fixed
Output current capability: 800mA
Package type: TO-263 (DDPAK-5)
Mounting: Surface mount
Protection features: Over current, over temperature, short circuit, UVLO
Operating temperature range: -40°C ~ 125°C
Input voltage maximum: 5.5V

The substitute parts are grouped into two categories: direct manufacturer equivalents (same base part number with packaging variants) and parametric equivalents (alternative base part numbers with compatible electrical specifications).

Parameter Comparison

Parameter	LP3881ES-1.2	LP3881ES-1.2/NOPB	LP3891ES-1.2/NOPB	LP3891ES-1.2
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Last Time Buy
Output Voltage	1.2V	1.2V	1.2V	1.2V
Output Current	800mA	800mA	800mA	800mA
Voltage Dropout (Max)	0.16V @ 800mA	0.16V @ 800mA	0.4V @ 800mA	0.4V @ 800mA
Quiescent Current	30 µA	30 µA	30 µA	30 µA
Package	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

LP3881ES-1.2/NOPB is the primary direct substitute for the obsolete LP3881ES-1.2. Both parts share identical electrical specifications, including the 0.16V maximum dropout voltage at 800mA. The /NOPB variant indicates lead-free, halogen-free packaging and carries Active product status with ROHS3 compliance, making it suitable for new designs and production environments with RoHS requirements.

LP3891ES-1.2/NOPB and LP3891ES-1.2 are parametric equivalents with the same output voltage, current rating, and package type. The key difference is the increased dropout voltage of 0.4V at 800mA compared to 0.16V for the LP3881 series. LP3891ES-1.2/NOPB is Active with ROHS3 compliance, while LP3891ES-1.2 carries Last Time Buy status. Selection between LP3881 and LP3891 variants depends on thermal budget and input voltage headroom requirements in the application circuit.

All substitute parts maintain identical protection features, control features, and operating temperature ranges, ensuring functional compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can LP3881ES-1.2/NOPB directly replace LP3881ES-1.2 in production?

A: Yes. LP3881ES-1.2/NOPB is a direct equivalent with identical electrical specifications and package type. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between LP3881 and LP3891 series regulators?

A: The LP3891 series has a higher maximum dropout voltage of 0.4V at 800mA, compared to 0.16V for the LP3881 series. All other electrical parameters, output voltage, current rating, and package type remain identical. Selection depends on available input voltage margin and thermal considerations.

Q: Are all substitute parts available in the same TO-263 package?

A: Yes. All listed substitute parts use the TO-263 (DDPAK-5) surface mount package with identical pinout and thermal characteristics.

Q: What does the /NOPB suffix indicate?

A: The /NOPB suffix indicates a lead-free, halogen-free packaging variant that complies with ROHS3 standards. This variant is required for applications subject to RoHS regulations.

Q: Can I use LP3891ES-1.2 instead of LP3881ES-1.2/NOPB?

A: LP3891ES-1.2 is functionally compatible but carries Last Time Buy status. For new designs and long-term production, LP3881ES-1.2/NOPB or LP3891ES-1.2/NOPB (both Active status) are preferred. The higher dropout voltage of LP3891 must be evaluated against circuit requirements.

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