LP5900SD-1.8 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP5900SD-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 150mA current capability in a 6-WSON surface mount package. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

The LP5900SD-1.8 provides regulated 1.8V output with integrated over-temperature and short-circuit protection, suitable for low-power applications requiring stable voltage regulation with minimal dropout characteristics.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	150mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.15V @ 150mA
Quiescent Current	50 µA
Operating Temperature Range	-40°C to 85°C
Package Type	6-WSON (2.2x2.5)
Protection Features	Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP5900SD-1.8 are identified based on strict electrical and mechanical parameter matching within the LP5900 series. Substitution eligibility is determined by the following criteria:

Fixed output voltage of 1.8V
Output current rating of 150mA
Maximum input voltage of 5.5V
Voltage dropout specification of 0.15V @ 150mA
Quiescent current of 50 µA
Operating temperature range of -40°C to 85°C
6-WSON (2.2x2.5) package configuration
Identical protection features (Over Temperature, Short Circuit)
Enable control feature

The identified substitutes maintain full parametric equivalence across all electrical specifications and mechanical packaging requirements.

Parameter Comparison

Parameter	LP5900SD-1.8	LP5900SD-1.8/NOPB	LP5900SDX-1.8/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	1.8V	1.8V	1.8V
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)
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package	6-WSON (2.2x2.5)	6-WSON (2.2x2.5)	6-WSON (2.2x2.5)
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tube	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

For applications currently using the obsolete LP5900SD-1.8, the following selection criteria apply:

LP5900SD-1.8/NOPB is the direct manufacturer equivalent offering identical electrical performance with active product status. This part is ROHS3 compliant and available in Cut Tape and Digi-Reel® packaging formats, providing flexibility for both prototype and production environments.

LP5900SDX-1.8/NOPB is a parametric equivalent with identical electrical specifications and active product status. This variant is ROHS3 compliant and supplied in Tape & Reel format, optimized for high-volume manufacturing applications.

Both substitute parts provide full electrical and mechanical compatibility with the obsolete LP5900SD-1.8 while offering improved compliance status and active manufacturer support. Selection between LP5900SD-1.8/NOPB and LP5900SDX-1.8/NOPB should be based on packaging requirements and procurement volume.

Frequently Asked Questions (FAQ)

Q: Can LP5900SD-1.8/NOPB be used as a direct replacement for LP5900SD-1.8?

A: Yes. The LP5900SD-1.8/NOPB maintains identical electrical specifications, output voltage, current rating, dropout voltage, and package configuration. The primary differences are active product status and ROHS3 compliance.

Q: What is the difference between LP5900SD-1.8/NOPB and LP5900SDX-1.8/NOPB?

A: Both parts are parametric equivalents with identical electrical performance. The primary distinction is packaging format: LP5900SD-1.8/NOPB is available in Cut Tape and Digi-Reel® formats, while LP5900SDX-1.8/NOPB is supplied in Tape & Reel format. Selection depends on procurement and assembly requirements.

Q: Are the substitute parts pin-compatible with the original LP5900SD-1.8?

A: Yes. All substitute parts use the identical 6-WSON (2.2x2.5) package with the same pinout and mechanical dimensions, ensuring direct PCB compatibility without layout modifications.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix indicates the part is supplied without plumbum (lead-free), reflecting RoHS compliance requirements. This is a packaging and compliance designation with no impact on electrical functionality.

Q: Is the LP5900SD-1.8 still available from Texas Instruments?

A: No. The LP5900SD-1.8 is classified as obsolete. LP5900SD-1.8/NOPB and LP5900SDX-1.8/NOPB are the active alternatives from Texas Instruments with full parametric equivalence.

Q: Can these parts be used interchangeably in production?

A: Yes. All three parts share identical electrical specifications, output voltage, current capability, and package configuration. Substitution requires no circuit modifications or design changes.

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