LX8211-30ISE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LX8211-30ISE is a linear voltage regulator IC manufactured by Microchip Technology, designed to deliver a fixed 3V output at 150mA in a surface-mount SOT-23-5 package. This device features an Enable control function and integrated protection against over-temperature and short-circuit conditions. The part is classified as Obsolete, necessitating identification of functionally equivalent active alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal operating range while supporting equivalent or enhanced protection features.

Key Parameters

Parameter	LX8211-30ISE	Unit
Output Voltage (Fixed)	3V	V
Output Current	150mA	mA
Input Voltage (Max)	6V	V
Dropout Voltage @ 150mA	0.4V	V
Quiescent Current	220 µA	µA
PSRR @ 120Hz	50dB	dB
Operating Temperature Range	-40°C to 125°C	°C
Package Type	SOT-23-5	—
Control Features	Enable	—
Protection Features	Over Temperature, Short Circuit	—
Product Status	Obsolete	—
RoHS Compliance	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the LX8211-30ISE are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Requirements:

Fixed output voltage of 3V
Output current rating of 150mA or greater
Maximum input voltage of 6V or higher
Operating temperature range of -40°C to 125°C
Surface-mount SOT-23-5 package configuration
Enable control function capability
Over-temperature protection (mandatory)

Substitution Logic: Parts are grouped into two categories based on dropout voltage performance and protection feature enhancements. Category 1 includes direct replacements with improved dropout voltage specifications (0.25V or lower) and enhanced protection features including Over Current and Under Voltage Lockout. Category 2 includes parts with higher output current ratings (300mA) that maintain backward compatibility with 150mA applications. All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Parameter Comparison

Parameter	LX8211-30ISE	MIC5255-3.0YM5-TR	MIC5255-3.0YD5-TR	LD3985M30R	LDS3985M30R	TPS76330DBVR
Manufacturer	Microchip	Microchip	Microchip	STMicroelectronics	STMicroelectronics	Texas Instruments
Output Voltage	3V	3V	3V	3V	3V	3V
Output Current	150mA	150mA	150mA	150mA	300mA	150mA
Input Voltage (Max)	6V	6V	6V	6V	6V	10V
Dropout Voltage @ Rated Current	0.4V @ 150mA	0.25V @ 150mA	0.25V @ 150mA	0.1V @ 150mA	0.25V @ 300mA	Not Specified
Quiescent Current	220 µA	150 µA	150 µA	150 µA	150 µA	100 µA
PSRR	50dB @ 120Hz	60dB ~ 50dB @ 10Hz ~ 10kHz	60dB ~ 50dB @ 10Hz ~ 10kHz	60dB ~ 50dB @ 1kHz ~ 10kHz	55dB ~ 50dB @ 1kHz ~ 10kHz	60dB @ 1kHz
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package	SOT-23-5	SOT-23-5	TSOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Control Features	Enable	Enable	Enable	Enable	Shutdown	Enable
Protection Features	Over Temperature, Short Circuit	Over Current, Over Temperature, UVLO	Over Current, Over Temperature, UVLO	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement Category):

MIC5255-3.0YM5-TR and MIC5255-3.0YD5-TR are functionally equivalent active alternatives from Microchip Technology. Both maintain the 3V fixed output and 150mA current rating with identical electrical specifications. The MIC5255-3.0YM5-TR is supplied in SOT-23-5 packaging on Tape & Reel, while the MIC5255-3.0YD5-TR is supplied in TSOT-23-5 (thin variant) packaging. Both feature improved dropout voltage (0.25V versus 0.4V), reduced quiescent current (150µA versus 220µA), and enhanced protection including Over Current and Under Voltage Lockout capabilities. Both are ROHS3 compliant with unlimited MSL rating.

Secondary Substitutes (Enhanced Performance Category):

LD3985M30R from STMicroelectronics provides superior dropout voltage performance (0.1V @ 150mA) while maintaining all core electrical specifications. This part is supplied in Cut Tape & Digi-Reel packaging in SOT-23-5 configuration. Protection features include Over Current and Over Temperature. This substitute is suitable for applications requiring lower power dissipation in dropout conditions.

LDS3985M30R from STMicroelectronics offers increased output current capacity (300mA) while maintaining 3V fixed output and SOT-23-5 packaging. This part provides backward compatibility with 150mA applications while supporting higher current demands. Control features include Shutdown rather than Enable. This substitute is appropriate for designs requiring current headroom or future scaling.

Alternative Substitute (Extended Input Voltage Range):

TPS76330DBVR from Texas Instruments supports extended maximum input voltage (10V versus 6V) while maintaining 3V fixed output and 150mA current rating in SOT-23-5 packaging. This part features the lowest quiescent current (100µA) and includes Reverse Polarity protection in addition to Over Current and Over Temperature protection. This substitute is suitable for applications with higher input voltage sources.

All substitute parts maintain ROHS3 compliance, unlimited MSL rating, and operating temperature range of -40°C to 125°C, ensuring regulatory and environmental compatibility with the original LX8211-30ISE specification.

Frequently Asked Questions (FAQ)

Q: Can MIC5255-3.0YM5-TR directly replace LX8211-30ISE in existing designs?

A: Yes. MIC5255-3.0YM5-TR maintains identical output voltage (3V), output current (150mA), input voltage maximum (6V), operating temperature range (-40°C to 125°C), and SOT-23-5 package configuration. The part features improved dropout voltage (0.25V versus 0.4V) and enhanced protection features. Pin-to-pin compatibility and functional equivalence are confirmed across all critical electrical parameters.

Q: What is the difference between MIC5255-3.0YM5-TR and MIC5255-3.0YD5-TR?

A: Both parts are electrically identical with 3V output, 150mA current, and equivalent performance specifications. The primary difference is packaging: MIC5255-3.0YM5-TR uses standard SOT-23-5 (SC-74A, SOT-753), while MIC5255-3.0YD5-TR uses TSOT-23-5 (thin variant). TSOT-23-5 is a thinner package variant suitable for space-constrained applications. Selection depends on PCB layout requirements and available board space.

Q: Why would I select LD3985M30R over MIC5255-3.0YM5-TR?

A: LD3985M30R provides superior dropout voltage performance (0.1V @ 150mA versus 0.25V), resulting in lower power dissipation and reduced thermal stress in applications operating near the maximum input voltage. This is beneficial for battery-powered or low-headroom supply applications. Both parts maintain identical output specifications and SOT-23-5 packaging.

Q: Is LDS3985M30R suitable for 150mA applications?

A: Yes. LDS3985M30R is rated for 300mA output current, providing full backward compatibility with 150mA applications. The part maintains 3V fixed output, SOT-23-5 packaging, and -40°C to 125°C operating range. The higher current rating provides design margin and supports future scaling to higher current demands without component replacement.

Q: What advantage does TPS76330DBVR offer?

A: TPS76330DBVR supports extended maximum input voltage (10V versus 6V), enabling use in applications with higher supply voltages. The part features the lowest quiescent current (100µA) among all substitutes, reducing standby power consumption. Reverse Polarity protection is included, providing additional circuit protection. SOT-23-5 packaging and 3V/150mA output specifications remain identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—MIC5255-3.0YM5-TR, MIC5255-3.0YD5-TR, LD3985M30R, LDS3985M30R, and TPS76330DBVR—are ROHS3 compliant with unlimited MSL rating (1), ensuring regulatory compliance and compatibility with modern manufacturing processes.

Q: Can I use these substitutes in new production designs?

A: Yes. All substitute parts are classified as Active products, ensuring long-term availability and manufacturing support. The LX8211-30ISE is Obsolete, making active substitutes necessary for new designs and ongoing production. MIC5255-3.0YM5-TR is recommended as the primary substitute due to manufacturer continuity (Microchip Technology) and highest inventory availability (18,750 units).

Q: What is the impact of different control features (Enable vs. Shutdown)?

A: LX8211-30ISE and most substitutes feature Enable control, allowing the regulator to be enabled or disabled via a control pin. LDS3985M30R features Shutdown control, which provides equivalent functionality for power management. Both control methods allow the regulator output to be disabled; the specific implementation depends on circuit design requirements and PCB layout.

Q: Do all substitutes support the same protection features?

A: All substitutes include Over Temperature protection, matching the LX8211-30ISE requirement. Most substitutes add Over Current protection and additional features: MIC5255 variants include Under Voltage Lockout (UVLO), LD3985M30R includes Over Current, and TPS76330DBVR includes Reverse Polarity protection. These enhancements provide superior circuit protection compared to the original part.

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