LP5900SDX-3.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP5900SDX-3.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3V output applications with 150mA current capability in a compact 6-WSON package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides regulated power management with integrated protection features including over-temperature and short-circuit protection, suitable for low-power applications requiring stable 3V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	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)
Control Features	Enable
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C ~ 85°C

Substitute Part Grouping Explanation

Substitution for the LP5900SDX-3.0 is determined by the following critical parameters: fixed 3V output voltage, 150mA output current capability, maximum 5.5V input voltage, 6-WSON package form factor, and surface mount technology. The substitute parts are grouped into two categories based on their relationship to the main part:

Parametric Equivalents maintain identical electrical specifications and package dimensions, differing only in packaging format (Cut Tape vs. Tape & Reel) or product status. These parts are direct functional replacements with no design modifications required.

Manufacturer Recommended Substitute (BH31RB1WGUT-E2 from Rohm Semiconductor) provides equivalent functionality with minor parameter variations that remain within acceptable design tolerances. The output voltage is 3.1V instead of 3V, and the package is 4-VCSP60N1 instead of 6-WSON, requiring PCB layout redesign but maintaining electrical compatibility for applications with 3.1V tolerance.

Parameter Comparison

Parameter	LP5900SDX-3.0	LP5900SD-3.0/NOPB	LP5900SDX-3.0/NOPB	BH31RB1WGUT-E2
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Rohm Semiconductor
Output Voltage	3V	3V	3V	3.1V
Output Current	150mA	150mA	150mA	150mA
Input Voltage (Max)	5.5V	5.5V	5.5V	5.5V
Voltage Dropout (Max)	0.15V @ 150mA	0.15V @ 150mA	0.15V @ 150mA	0.15V @ 100mA
Quiescent Current	50 µA	50 µA	50 µA	72 µA
Package Type	6-WSON (2.2x2.5)	6-WSON (2.2x2.5)	6-WSON (2.2x2.5)	4-VCSP60N1 (1x1.04)
Control Features	Enable	Enable	Enable	ON/OFF
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Current
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production transitions, LP5900SD-3.0/NOPB or LP5900SDX-3.0/NOPB are the preferred substitutes. Both parts are active products with ROHS3 compliance and identical electrical specifications to the obsolete LP5900SDX-3.0. The choice between these two depends on packaging requirements: LP5900SD-3.0/NOPB is supplied in Cut Tape format with 28,423 units in stock, while LP5900SDX-3.0/NOPB is supplied in Tape & Reel format with 5,900 units in stock.

The BH31RB1WGUT-E2 from Rohm Semiconductor is a manufacturer-recommended alternative for applications where the 3.1V output voltage and smaller 4-VCSP60N1 package are acceptable. This substitute requires PCB layout redesign due to the different package footprint but offers the advantage of a more compact form factor. The quiescent current is slightly higher at 72 µA compared to 50 µA, and the dropout voltage specification applies at 100mA rather than 150mA. This part is ROHS3 compliant and actively produced.

Frequently Asked Questions (FAQ)

Q: Can LP5900SD-3.0/NOPB directly replace LP5900SDX-3.0 without PCB modifications?

A: Yes. Both parts use the identical 6-WSON (2.2x2.5) package and have matching electrical specifications. The only difference is packaging format (Cut Tape vs. Tape & Reel), which does not affect PCB layout or electrical performance.

Q: What is the difference between LP5900SDX-3.0/NOPB and LP5900SD-3.0/NOPB?

A: These parts are electrically identical with the same 6-WSON package. The difference is in supplier packaging: LP5900SDX-3.0/NOPB comes in Tape & Reel format, while LP5900SD-3.0/NOPB comes in Cut Tape format. Selection depends on production volume and assembly equipment compatibility.

Q: Can BH31RB1WGUT-E2 be used as a drop-in replacement?

A: No. The BH31RB1WGUT-E2 requires PCB redesign due to its different package type (4-VCSP60N1 vs. 6-WSON). Additionally, the output voltage is 3.1V instead of 3V, which may require circuit validation depending on application tolerance specifications.

Q: Why is the LP5900SDX-3.0 marked as obsolete?

A: The LP5900SDX-3.0 is obsolete, but active equivalent parts are available. LP5900SD-3.0/NOPB and LP5900SDX-3.0/NOPB provide identical functionality and are recommended for all new designs and production requirements.

Q: What are the RoHS compliance differences?

A: The original LP5900SDX-3.0 is RoHS non-compliant. All substitute parts (LP5900SD-3.0/NOPB, LP5900SDX-3.0/NOPB, and BH31RB1WGUT-E2) are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: How do the protection features differ between substitutes?

A: The Texas Instruments parts (LP5900SD-3.0/NOPB and LP5900SDX-3.0/NOPB) provide over-temperature and short-circuit protection. The Rohm BH31RB1WGUT-E2 provides over-current protection. Both protection schemes are suitable for 150mA output applications but differ in implementation approach.

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