LP2985IM5-4.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5-4.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 4V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LP2985 series provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring low-dropout regulation with enable control functionality.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	4V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2985IM5-4.0 is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 4V
Output current capability of 150mA
Maximum input voltage of 16V
SOT-23-5 package compatibility
Operating temperature range of -40°C to 125°C
Enable control functionality
Over-current and over-temperature protection

Texas Instruments LP2985 variants (LP2985AIM5-4.0/NOPB, LP2985IM5-4.0/NOPB, LP2985AIM5X-4.0/NOPB, LP2985IM5X-4.0/NOPB) maintain identical electrical specifications and differ only in product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel vs. Tape & Reel). The Microchip MIC5205-4.0YM5-TR provides functional equivalence with identical output voltage, current, package, and temperature range, though with improved dropout voltage (0.35V vs. 0.58V) and PSRR performance.

Parameter Comparison

Parameter	LP2985IM5-4.0	LP2985AIM5-4.0/NOPB	LP2985AIM5X-4.0/NOPB	LP2985IM5-4.0/NOPB	LP2985IM5X-4.0/NOPB	MIC5205-4.0YM5-TR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology
Output Voltage	4V	4V	4V	4V	4V	4V
Output Current	150mA	150mA	150mA	150mA	150mA	150mA
Input Voltage (Max)	16V	16V	16V	16V	16V	16V
Dropout Voltage (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.35V @ 150mA
Quiescent Current	95 µA	95 µA	95 µA	95 µA	95 µA	150 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	75dB (100Hz)
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
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
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Reverse Polarity

Engineering Selection Recommendations

For new designs and production transitions from the obsolete LP2985IM5-4.0, the Texas Instruments LP2985 active variants (LP2985AIM5-4.0/NOPB, LP2985AIM5X-4.0/NOPB, LP2985IM5-4.0/NOPB, LP2985IM5X-4.0/NOPB) provide direct electrical and mechanical equivalence with the advantage of active product status and ROHS3 compliance. These variants differ only in packaging format and inventory availability.

The Microchip MIC5205-4.0YM5-TR serves as a cross-manufacturer alternative with identical functional specifications and package compatibility. This part offers improved performance characteristics including lower dropout voltage (0.35V vs. 0.58V) and higher PSRR (75dB at 100Hz vs. 45dB at 1kHz), with the trade-off of slightly elevated quiescent current (150 µA vs. 95 µA). The MIC5205-4.0YM5-TR is ROHS3 compliant and maintains active product status.

Selection between Texas Instruments and Microchip variants should be based on supply chain availability, packaging requirements (Cut Tape & Digi-Reel vs. Tape & Reel), and application-specific performance needs regarding dropout voltage and quiescent current characteristics.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-4.0/NOPB be used as a direct replacement for LP2985IM5-4.0?

A: Yes. Both parts share identical electrical specifications including 4V output, 150mA current, 0.58V dropout voltage, and SOT-23-5 packaging. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). The LP2985AIM5-4.0/NOPB is the recommended active equivalent.

Q: What is the difference between LP2985IM5X-4.0/NOPB and LP2985IM5-4.0/NOPB?

A: These parts are electrically identical. The difference lies in packaging format: LP2985IM5X-4.0/NOPB is supplied in Tape & Reel format, while LP2985IM5-4.0/NOPB is supplied in Cut Tape & Digi-Reel format. Selection depends on production volume and assembly equipment compatibility.

Q: Is the Microchip MIC5205-4.0YM5-TR a suitable substitute for the LP2985IM5-4.0?

A: Yes, the MIC5205-4.0YM5-TR is functionally equivalent with identical 4V output, 150mA current capability, and SOT-23-5 package. It provides superior dropout voltage performance (0.35V vs. 0.58V) and higher PSRR (75dB vs. 45dB). Quiescent current is slightly higher at 150 µA versus 95 µA. Protection features include reverse polarity protection in addition to over-current and over-temperature protection.

Q: Are all substitute parts RoHS compliant?

A: The Texas Instruments LP2985 active variants and Microchip MIC5205-4.0YM5-TR are all ROHS3 compliant. The original LP2985IM5-4.0 is RoHS non-compliant. For applications requiring RoHS compliance, use any of the active substitute parts listed.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by fixed output voltage (4V), output current (150mA), maximum input voltage (16V), SOT-23-5 package compatibility, operating temperature range (-40°C to 125°C), enable control functionality, and protection features (over-current and over-temperature minimum). Dropout voltage, quiescent current, and PSRR may vary between substitutes while maintaining functional compatibility.

Q: Can I mix packaging formats in the same production run?

A: Packaging format differences (Cut Tape & Digi-Reel vs. Tape & Reel) affect supply chain logistics and assembly equipment compatibility but do not impact electrical performance or PCB-level functionality. Mixing formats in the same production run is feasible if assembly equipment supports both formats, though standardizing on a single format is recommended for supply chain consistency.

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