LP5900SDX-3.3 Equivalent & Substitute Parts

Part Overview

The LP5900SDX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This device delivers 150mA output current in a compact 6-WSON (2.2x2.5) surface mount package with integrated over-temperature and short-circuit protection. The part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.15V @ 150mA
Quiescent Current	50 µA
Package Type	6-WSON (2.2x2.5)
Operating Temperature Range	-40°C ~ 85°C
Control Features	Enable
Protection Features	Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP5900SDX-3.3 are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution criteria are:

Output voltage configuration: Positive fixed 3.3V
Output current capability: 150mA
Maximum input voltage: 5.5V
Voltage dropout: 0.15V @ 150mA
Quiescent current: 50 µA
Package type: 6-WSON (2.2x2.5)
Operating temperature range: -40°C ~ 85°C
Control and protection features: Enable function with over-temperature and short-circuit protection

Both substitute parts meet these criteria and are derived from the same LP5900 base product family, differing only in packaging configuration and product status.

Parameter Comparison

Parameter	LP5900SDX-3.3	LP5900SD-3.3/NOPB	LP5900SDX-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V
Output Current	150mA	150mA	150mA
Input Voltage (Max)	5.5V	5.5V	5.5V
Voltage Dropout (Max)	0.15V @ 150mA	0.15V @ 150mA	0.15V @ 150mA
Quiescent Current	50 µA	50 µA	50 µA
PSRR	85dB ~ 40dB (100Hz ~ 100kHz)	85dB ~ 40dB (100Hz ~ 100kHz)	85dB ~ 40dB (100Hz ~ 100kHz)
Package Type	6-WSON (2.2x2.5)	6-WSON (2.2x2.5)	6-WSON (2.2x2.5)
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
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both LP5900SD-3.3/NOPB and LP5900SDX-3.3/NOPB are direct parametric equivalents to the obsolete LP5900SDX-3.3. The primary distinction between substitute options is product status and regulatory compliance:

LP5900SD-3.3/NOPB is classified as Active with ROHS3 compliance and is available in Cut Tape (CT) and Digi-Reel packaging with 16,848 units in stock. This part is the preferred selection for new designs and ongoing production requiring regulatory compliance.

LP5900SDX-3.3/NOPB is also classified as Active with ROHS3 compliance and is available in Cut Tape (CT) and Digi-Reel packaging with 2,226 units in stock. This part maintains identical electrical and mechanical specifications to the original obsolete device.

Both substitute parts eliminate the RoHS non-compliance status of the original part while maintaining complete functional and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP5900SD-3.3/NOPB or LP5900SDX-3.3/NOPB be used as direct replacements for LP5900SDX-3.3?

A: Yes. Both substitute parts are parametric equivalents with identical output voltage (3.3V), output current (150mA), input voltage rating (5.5V max), voltage dropout (0.15V @ 150mA), quiescent current (50 µA), package type (6-WSON 2.2x2.5), operating temperature range (-40°C ~ 85°C), and protection features. Pin-to-pin and functional compatibility is complete.

Q: What is the difference between LP5900SD-3.3/NOPB and LP5900SDX-3.3/NOPB?

A: Both parts are electrically and mechanically identical. The primary difference is packaging configuration and inventory availability. LP5900SD-3.3/NOPB is supplied in Cut Tape (CT) and Digi-Reel format with higher stock levels (16,848 units). LP5900SDX-3.3/NOPB is also supplied in Cut Tape (CT) and Digi-Reel format with lower stock levels (2,226 units). Both are Active products with ROHS3 compliance.

Q: Why is the original LP5900SDX-3.3 marked as obsolete?

A: The original part is classified as obsolete by Texas Instruments. The substitute parts LP5900SD-3.3/NOPB and LP5900SDX-3.3/NOPB are active alternatives from the same LP5900 product family that provide continued design support and regulatory compliance.

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

A: Yes. The original LP5900SDX-3.3 is RoHS non-compliant. Both substitute parts (LP5900SD-3.3/NOPB and LP5900SDX-3.3/NOPB) are ROHS3 compliant. All three parts are REACH Unaffected and classified under ECCN EAR99.

Q: Is the 6-WSON (2.2x2.5) package identical across all three parts?

A: Yes. All three parts use the identical 6-WDFN Exposed Pad package with 6-WSON (2.2x2.5) supplier device package designation. PCB layout and thermal management characteristics are unchanged.

Q: What is the moisture sensitivity level for these parts?

A: All three parts have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

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