LP3985IM5-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3985IM5-5.0 is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 5V output at 150mA in a compact SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The device provides positive fixed output regulation with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable 5V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	150mA
Input Voltage (Max)	6V
Dropout Voltage	0.1V @ 150mA
Quiescent Current	150 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LP3985IM5-5.0 is determined by the following critical parameters: fixed 5V output voltage, output current capability, maximum input voltage rating, dropout voltage performance, package type (SOT-23-5), and operating temperature range. Parts are grouped into three categories based on substitution compatibility:

Direct Equivalents (Same Output Current - 150mA): Parts with identical 150mA output current rating and matching electrical specifications allow direct replacement without circuit redesign.

Parametric Equivalents (Higher Output Current - 300mA to 500mA): Parts with higher current ratings (300mA or 500mA) provide enhanced capability while maintaining the same 5V output, package, and protection features. These are suitable for applications where additional current headroom is beneficial.

Lower Current Alternatives (50mA to 100mA): Parts with reduced output current ratings (50mA or 100mA) are suitable only for applications with lower current requirements and cannot support the full 150mA load.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temp	Product Status	RoHS Status
LP3985IM5-5.0	Texas Instruments	150mA	6V	0.1V @ 150mA	150 µA	-40°C to 125°C	Obsolete	Non-compliant
LP3985IM5-5.0/NOPB	Texas Instruments	150mA	6V	0.1V @ 150mA	150 µA	-40°C to 125°C	Active	ROHS3 Compliant
LP3985IM5X-5.0/NOPB	Texas Instruments	150mA	6V	0.1V @ 150mA	150 µA	-40°C to 125°C	Active	ROHS3 Compliant
TC1185-5.0VCT713	Microchip Technology	150mA	6V	0.4V @ 150mA	80 µA	-40°C to 125°C	Active	ROHS3 Compliant
MAX8877EUK50+T	Analog Devices Inc./Maxim Integrated	150mA	6.5V	0.165V @ 150mA (Typ)	180 µA	-40°C to 85°C	Active	ROHS3 Compliant
MAX8878EUK50+	Analog Devices Inc./Maxim Integrated	150mA	6.5V	0.165V @ 150mA (Typ)	180 µA	-40°C to 85°C	Active	ROHS3 Compliant
RT9167-50GB	Richtek USA Inc.	300mA	7V	0.45V @ 300mA	150 µA	-40°C to 125°C	Active	ROHS3 Compliant
RT9167A-50GB	Richtek USA Inc.	500mA	7V	0.75V @ 500mA	150 µA	-40°C to 125°C	Active	ROHS3 Compliant
TC1015-5.0VCT713	Microchip Technology	100mA	6V	0.25V @ 100mA	80 µA	-40°C to 125°C	Active	ROHS3 Compliant
TC1014-5.0VCT713	Microchip Technology	50mA	6V	0.12V @ 50mA	80 µA	-40°C to 125°C	Active	ROHS3 Compliant
TC2014-5.0VCTTR	Microchip Technology	50mA	6V	0.07V @ 50mA	80 µA	-40°C to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (150mA Load Requirement):

LP3985IM5-5.0/NOPB and LP3985IM5X-5.0/NOPB from Texas Instruments are the primary direct substitutes, offering identical electrical performance with active product status and ROHS3 compliance. Both parts maintain the original 0.1V dropout voltage and 150 µA quiescent current specifications.

TC1185-5.0VCT713 from Microchip Technology provides 150mA output current with identical input voltage and temperature range specifications. This part features lower quiescent current (80 µA) but exhibits higher dropout voltage (0.4V @ 150mA) compared to the original.

MAX8877EUK50+T and MAX8878EUK50+ from Analog Devices Inc./Maxim Integrated deliver 150mA output with extended input voltage rating (6.5V) and ROHS3 compliance. Operating temperature range is limited to -40°C to 85°C. Dropout voltage is 0.165V typical at 150mA.

For Enhanced Current Capability:

RT9167-50GB provides 300mA output current in the same SOT-23-5 package with extended input voltage (7V) and full -40°C to 125°C operating range. Suitable for applications requiring additional current margin.

RT9167A-50GB offers 500mA output current, providing maximum current headroom in the same package footprint. Dropout voltage increases to 0.75V @ 500mA.

For Reduced Current Applications:

TC1015-5.0VCT713 supports 100mA output current with ROHS3 compliance and full temperature range.

TC1014-5.0VCT713 and TC2014-5.0VCTTR support 50mA output current. TC2014-5.0VCTTR exhibits superior dropout voltage performance (0.07V @ 50mA).

All substitute parts maintain SOT-23-5 package compatibility, enabling direct PCB footprint replacement. Selection should be based on actual load current requirements and thermal performance needs in the target application.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current rated part (300mA or 500mA) as a direct substitute for the 150mA LP3985IM5-5.0?

A: Yes. RT9167-50GB (300mA) and RT9167A-50GB (500mA) are pin-compatible substitutes in the SOT-23-5 package. Higher current ratings do not affect circuit operation at lower loads. However, dropout voltage increases with current rating, which may impact performance in low input voltage conditions.

Q: What is the difference between LP3985IM5-5.0 and LP3985IM5-5.0/NOPB?

A: Both parts are electrically identical with matching specifications. The /NOPB designation indicates "No Lead (Pb)" and confirms ROHS3 compliance. LP3985IM5-5.0/NOPB is the active production variant with current availability.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant except the original LP3985IM5-5.0, which is marked as RoHS non-compliant. This compliance status is relevant for applications subject to RoHS regulations.

Q: Which substitute offers the lowest dropout voltage?

A: TC2014-5.0VCTTR provides the lowest dropout voltage at 0.07V @ 50mA. For 150mA applications, LP3985IM5-5.0/NOPB and LP3985IM5X-5.0/NOPB maintain the original 0.1V dropout voltage specification.

Q: Can I use a lower current rated part (50mA or 100mA) if my application only requires partial current?

A: Lower current parts are suitable only if your actual load current does not exceed their rated output. TC1014-5.0VCT713 and TC2014-5.0VCTTR are limited to 50mA; TC1015-5.0VCT713 is limited to 100mA. Exceeding rated current causes voltage regulation failure and potential device damage.

Q: What is the operating temperature difference between substitutes?

A: Most substitutes support the full -40°C to 125°C range matching the original. MAX8877EUK50+T and MAX8878EUK50+ are limited to -40°C to 85°C, which may restrict use in high-temperature applications.

Q: Are all substitutes available in the same packaging format?

A: All substitutes use SOT-23-5 (SC-74A) package for PCB footprint compatibility. Packaging variants (Cut Tape, Tape & Reel, Digi-Reel) differ by supplier but do not affect electrical performance or pinout.

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