LP5900SDX-2.8 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP5900SDX-2.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current with a fixed 2.8V output and operates across the -40°C to 85°C temperature range. The part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing production and design continuity. Active alternatives with identical electrical and mechanical specifications are available to support component sourcing requirements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	2.8V
Voltage - Input (Max)	5.5V
Current - Output	150mA
Voltage Dropout (Max)	0.15V @ 150mA
Current - Quiescent (Iq)	50 µA
Package / Case	6-WDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Control Features	Enable
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP5900SDX-2.8 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output voltage: 2.8V fixed
Maximum output current: 150mA
Maximum input voltage: 5.5V
Voltage dropout: 0.15V @ 150mA
Package type: 6-WDFN Exposed Pad (6-WSON 2.2x2.5)
Mounting type: Surface Mount
Operating temperature range: -40°C ~ 85°C
Control features: Enable function
Protection features: Over Temperature, Short Circuit

All identified substitutes maintain identical electrical performance specifications and physical package dimensions, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Parameter	LP5900SDX-2.8	LP5900SD-2.8/NOPB	LP5900SDX-2.8/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Voltage - Output (Fixed)	2.8V	2.8V	2.8V
Voltage - Input (Max)	5.5V	5.5V	5.5V
Current - Output	150mA	150mA	150mA
Voltage Dropout (Max)	0.15V @ 150mA	0.15V @ 150mA	0.15V @ 150mA
Current - Quiescent (Iq)	50 µA	50 µA	50 µA
Current - Supply (Max)	230 µA	230 µA	230 µA
PSRR	85dB ~ 40dB (100Hz ~ 100kHz)	85dB ~ 40dB (100Hz ~ 100kHz)	85dB ~ 40dB (100Hz ~ 100kHz)
Package / Case	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Control Features	Enable	Enable	Enable
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both LP5900SD-2.8/NOPB and LP5900SDX-2.8/NOPB are active product alternatives to the obsolete LP5900SDX-2.8. Selection between these substitutes is based on the following factors:

LP5900SD-2.8/NOPB is supplied in Tape & Reel (TR) packaging format with ROHS3 compliance certification. This variant is suitable for high-volume production environments requiring standardized tape and reel delivery.

LP5900SDX-2.8/NOPB maintains active product status with ROHS3 compliance certification. This part number variant provides continuity with the original part designation structure.

Both substitutes deliver identical electrical performance and are housed in the same 6-WDFN Exposed Pad package. The primary differentiation lies in packaging format and compliance certifications. Selection should be based on procurement requirements, supply chain preferences, and regulatory compliance mandates specific to the end application.

Frequently Asked Questions (FAQ)

Q: Can LP5900SD-2.8/NOPB or LP5900SDX-2.8/NOPB be used as direct replacements for the obsolete LP5900SDX-2.8?

A: Yes. Both substitute parts maintain identical electrical specifications including 2.8V fixed output, 150mA output current, 0.15V maximum dropout voltage, and operating temperature range of -40°C to 85°C. The 6-WDFN Exposed Pad package dimensions are identical, enabling direct PCB-level substitution without circuit redesign.

Q: What is the difference between LP5900SD-2.8/NOPB and LP5900SDX-2.8/NOPB?

A: The primary difference is packaging format. LP5900SD-2.8/NOPB is supplied in Tape & Reel format, while LP5900SDX-2.8/NOPB uses standard packaging. Both parts are electrically identical and ROHS3 compliant. Selection depends on procurement volume and supply chain requirements.

Q: Are the substitute parts ROHS compliant?

A: Yes. Both LP5900SD-2.8/NOPB and LP5900SDX-2.8/NOPB carry ROHS3 compliance certification, whereas the original LP5900SDX-2.8 is RoHS non-compliant. This compliance upgrade may be required for new production runs or regulatory adherence.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All three parts, including the original and both substitutes, have an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can these parts be used interchangeably in the same circuit?

A: Yes. The electrical and mechanical specifications are identical across all three part numbers. Interchangeability is confirmed by matching output voltage, current capacity, dropout voltage, package type, and operating temperature range.

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