LP3881ES-1.2/NOPB Equivalent & Substitute Parts

Part Overview

The LP3881ES-1.2/NOPB 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 in a TO-263 (DDPAK-5) surface mount package. The device is currently in Active product status with 875 units in stock.

Finding equivalent and substitute parts becomes necessary when the primary part reaches end-of-life, experiences supply constraints, or when design flexibility is required for multi-source procurement strategies. The LP3881ES-1.2/NOPB maintains specific electrical and mechanical characteristics that define its substitution scope.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.2V
Output Current	800mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.16V @ 800mA
Quiescent Current	30 µA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LP3881ES-1.2/NOPB is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 1.2V
Output current capability of 800mA
Maximum input voltage of 5.5V
TO-263 (DDPAK-5) package configuration
Operating temperature range of -40°C ~ 125°C
Identical protection feature set (Over Current, Over Temperature, Short Circuit, UVLO)
ROHS3 compliance and MSL 3 rating

The LP3891ES-1.2/NOPB and LP3891ES-1.2 meet these core electrical and mechanical requirements. Both parts are manufactured by Texas Instruments and share the same functional output specifications. Differences in voltage dropout characteristics and product status are noted in the parameter comparison table below.

Parameter Comparison

Parameter	LP3881ES-1.2/NOPB (Main)	LP3891ES-1.2/NOPB (Substitute)	LP3891ES-1.2 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	1.2V	1.2V	1.2V
Output Current	800mA	800mA	800mA
Input Voltage (Max)	5.5V	5.5V	5.5V
Voltage Dropout (Max)	0.16V @ 800mA	0.4V @ 800mA	0.4V @ 800mA
Quiescent Current	30 µA	30 µA	30 µA
Supply Current (Max)	8 mA	8 mA	8 mA
PSRR	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)
Package Type	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
Product Status	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Current Inventory	875 Pcs	1900 Pcs	1407 Pcs

Engineering Selection Recommendations

The LP3891ES-1.2/NOPB is the primary substitute for the LP3881ES-1.2/NOPB. Both parts maintain Active product status and offer equivalent electrical performance across all critical parameters. The LP3891ES-1.2/NOPB provides higher inventory availability (1900 units) compared to the main part.

The LP3891ES-1.2 is functionally equivalent but carries a Last Time Buy product status, indicating limited future availability. This part should be selected only when the LP3891ES-1.2/NOPB is unavailable and long-term supply is not a requirement.

Both substitute parts exhibit higher voltage dropout (0.4V @ 800mA) compared to the main part (0.16V @ 800mA). Applications with tight input voltage margins or high thermal sensitivity should account for this difference in power dissipation calculations.

All three parts maintain identical ROHS3 compliance, MSL 3 rating, and protection feature sets, ensuring regulatory and reliability equivalence.

Frequently Asked Questions (FAQ)

Q: Can LP3891ES-1.2/NOPB be used as a direct replacement for LP3881ES-1.2/NOPB?

A: Yes. Both parts deliver 1.2V at 800mA in TO-263 (DDPAK-5) packages with identical protection features and operating temperature ranges. The primary difference is voltage dropout: LP3891ES-1.2/NOPB exhibits 0.4V dropout versus 0.16V for the LP3881ES-1.2/NOPB. Verify that your application's input voltage margin accommodates the higher dropout specification.

Q: What is the difference between LP3891ES-1.2/NOPB and LP3891ES-1.2?

A: Both parts are electrically identical with matching output voltage, current, and package specifications. The LP3891ES-1.2/NOPB is in Active status with higher inventory (1900 units). The LP3891ES-1.2 carries Last Time Buy status with 1407 units available. For new designs, select LP3891ES-1.2/NOPB.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use the TO-263 (DDPAK-5) package configuration with identical mechanical and thermal characteristics. PCB layout and thermal management designs are directly transferable.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. LP3881ES-1.2/NOPB, LP3891ES-1.2/NOPB, and LP3891ES-1.2 are all ROHS3 compliant with MSL 3 (168 Hours) moisture sensitivity ratings. REACH status is Unaffected for all parts.

Q: How does the voltage dropout difference affect circuit design?

A: The LP3881ES-1.2/NOPB requires minimum input voltage of approximately 1.36V (1.2V output + 0.16V dropout). The LP3891 variants require approximately 1.6V minimum input. In applications with input voltages below 2V, the lower dropout of the LP3881ES-1.2/NOPB may be necessary. Recalculate power dissipation and thermal requirements when substituting.

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