LP5900SD-2.8 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP5900SD-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 classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.8V
Current - Output	150mA
Voltage - Input (Max)	5.5V
Voltage Dropout (Max)	0.15V @ 150mA
Current - Quiescent (Iq)	50 µA
Operating Temperature	-40°C ~ 85°C
Package / Case	6-WDFN Exposed Pad
Supplier Device Package	6-WSON (2.2x2.5)
Mounting Type	Surface Mount
Control Features	Enable
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP5900SD-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
Output current capability: 150mA
Maximum input voltage: 5.5V
Maximum dropout voltage: 0.15V @ 150mA
Quiescent current: 50 µA
Package type: 6-WSON (2.2x2.5)
Mounting type: Surface Mount
Control features: Enable function
Protection features: Over Temperature, Short Circuit

All identified substitutes maintain identical electrical specifications and mechanical compatibility with the original LP5900SD-2.8 device.

Parameter Comparison

Parameter	LP5900SD-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
Output Type	Fixed	Fixed	Fixed
Voltage - Output (Min/Fixed)	2.8V	2.8V	2.8V
Current - Output	150mA	150mA	150mA
Voltage - Input (Max)	5.5V	5.5V	5.5V
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)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad
Supplier Device Package	6-WSON (2.2x2.5)	6-WSON (2.2x2.5)	6-WSON (2.2x2.8)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
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)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

LP5900SD-2.8/NOPB is the primary substitute for the obsolete LP5900SD-2.8. This part maintains full electrical and mechanical compatibility while offering active product status and ROHS3 compliance. The packaging format (Tape & Reel) provides standard procurement advantages for production environments.

LP5900SDX-2.8/NOPB serves as an alternative substitute with identical electrical specifications and active product status. This variant also carries ROHS3 compliance. Both substitute parts eliminate the obsolescence risk associated with the original LP5900SD-2.8 device.

The transition from the obsolete LP5900SD-2.8 to either active substitute ensures regulatory compliance and long-term supply chain stability without requiring circuit redesign.

Frequently Asked Questions (FAQ)

Q: Are LP5900SD-2.8/NOPB and LP5900SDX-2.8/NOPB electrically identical to the original LP5900SD-2.8?

A: Yes. Both substitutes maintain identical electrical specifications including output voltage (2.8V fixed), output current (150mA), input voltage range (5.5V max), dropout voltage (0.15V @ 150mA), quiescent current (50 µA), and protection features (Over Temperature, Short Circuit).

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 packaging is not specified. Both parts are electrically equivalent and carry active product status with ROHS3 compliance.

Q: Can I use these substitutes as direct replacements in existing designs?

A: Yes. Both substitute parts are pin-compatible and package-compatible with the original LP5900SD-2.8. The 6-WSON (2.2x2.5) package footprint remains consistent across all variants, enabling direct PCB assembly without layout modifications.

Q: Why is the original LP5900SD-2.8 marked as obsolete?

A: The LP5900SD-2.8 has reached end-of-life status. The active substitutes LP5900SD-2.8/NOPB and LP5900SDX-2.8/NOPB provide continued design support and procurement availability.

Q: Are there compliance differences between the original part and the substitutes?

A: Yes. The original LP5900SD-2.8 is RoHS non-compliant, while both substitutes (LP5900SD-2.8/NOPB and LP5900SDX-2.8/NOPB) are ROHS3 compliant. Both maintain REACH Unaffected status. This compliance upgrade may be required for new designs or regulatory requirements.

Q: What inventory levels are available for these substitutes?

A: LP5900SD-2.8/NOPB has 21,857 units in stock. LP5900SDX-2.8/NOPB has 5,900 units in stock. Both represent active inventory from original manufacturers.

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