LP3881ES-1.5 Equivalent & Substitute Parts

Part Overview

The LP3881ES-1.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 1.5V at 800mA with a maximum dropout voltage of 0.16V at full load. The device is packaged in TO-263 (DDPAK-5) surface mount configuration and includes integrated protection features for over-current, over-temperature, short-circuit, and under-voltage lockout conditions.

The original LP3881ES-1.5 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing status and current compliance certifications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.5V
Output Current	800mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.16V @ 800mA
Quiescent Current	30 µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263 (DDPAK-5)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)

Substitute Part Grouping Explanation

Substitute parts for the LP3881ES-1.5 are classified based on electrical parameter compatibility and physical packaging equivalence. The substitution logic is determined by the following critical parameters:

Output voltage and current specifications (1.5V, 800mA)
Input voltage rating (5.5V maximum)
Package type and pin configuration (TO-263 DDPAK-5)
Protection feature set (Over Current, Over Temperature, Short Circuit, UVLO)
Operating temperature range (-40°C to 125°C)

Two substitute parts meet these criteria:

LP3881ES-1.5/NOPB — Direct manufacturer equivalent with identical electrical specifications and active product status.

LP3891ES-1.5/NOPB — Parametric equivalent with identical output voltage, current, and package specifications. The dropout voltage specification differs (0.4V @ 800mA versus 0.16V @ 800mA), making this suitable for applications where the higher dropout voltage is acceptable within the design margin.

Parameter Comparison

Parameter	LP3881ES-1.5	LP3881ES-1.5/NOPB	LP3891ES-1.5/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Voltage (Fixed)	1.5V	1.5V	1.5V
Output Current	800mA	800mA	800mA
Input Voltage (Max)	5.5V	5.5V	5.5V
Dropout Voltage (Max)	0.16V @ 800mA	0.16V @ 800mA	0.4V @ 800mA
Quiescent Current	30 µA	30 µA	30 µA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package Type	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)	TO-263 (DDPAK-5)
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit, UVLO	Over Current, Over Temperature, Short Circuit, UVLO	Over Current, Over Temperature, Short Circuit, UVLO
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

LP3881ES-1.5/NOPB is the primary substitute for the obsolete LP3881ES-1.5. This part maintains identical electrical specifications, including the 0.16V dropout voltage characteristic, and carries active product status with ROHS3 compliance certification. It is the direct replacement for applications requiring no design modification.

LP3891ES-1.5/NOPB serves as a secondary parametric equivalent. While it maintains the same output voltage, current rating, package type, and protection features, the increased dropout voltage of 0.4V @ 800mA requires evaluation against the application's input voltage margin and thermal budget. This part is suitable for designs where the higher dropout voltage does not exceed system constraints. Both substitute parts carry ROHS3 compliance and active manufacturing status.

Frequently Asked Questions (FAQ)

Q: Can LP3881ES-1.5/NOPB be used as a direct replacement for LP3881ES-1.5?

A: Yes. LP3881ES-1.5/NOPB is electrically and mechanically identical to the obsolete LP3881ES-1.5. It maintains the same output voltage (1.5V), output current (800mA), dropout voltage (0.16V @ 800mA), and TO-263 package configuration. The primary difference is active product status and ROHS3 compliance.

Q: What is the key difference between LP3881ES-1.5/NOPB and LP3891ES-1.5/NOPB?

A: The primary difference is dropout voltage. LP3881ES-1.5/NOPB specifies 0.16V @ 800mA, while LP3891ES-1.5/NOPB specifies 0.4V @ 800mA. All other electrical parameters, including output voltage, current rating, input voltage maximum, quiescent current, operating temperature range, and protection features, are identical. The package type and pin configuration are also identical.

Q: Can LP3891ES-1.5/NOPB be used in place of LP3881ES-1.5/NOPB?

A: LP3891ES-1.5/NOPB can be used if the application's input voltage margin accommodates the higher dropout voltage of 0.4V. For designs with tight input voltage budgets or high ambient temperatures, the increased dropout voltage may result in insufficient headroom. Verify that the minimum input voltage minus the 0.4V dropout voltage still meets the regulator's minimum input voltage requirement and the application's load regulation specifications.

Q: Are the packaging and pin configurations identical across all three parts?

A: Yes. LP3881ES-1.5, LP3881ES-1.5/NOPB, and LP3891ES-1.5/NOPB all use the TO-263 (DDPAK-5) surface mount package with identical pin assignments. No PCB layout modifications are required when substituting between these parts.

Q: What compliance certifications apply to the substitute parts?

A: Both LP3881ES-1.5/NOPB and LP3891ES-1.5/NOPB carry ROHS3 compliance certification. The original LP3881ES-1.5 is RoHS non-compliant. All three parts are REACH Unaffected and classified under ECCN EAR99.

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