LP2985IM5X-3.6 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5X-3.6 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.6V output applications with 150mA current capacity in SOT-23-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The regulator provides integrated protection features including over-current, over-temperature, and short-circuit protection, with an enable control feature for power management applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.6V
Output Current	150mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2985IM5X-3.6 is determined by strict equivalence across the following critical parameters:

Output voltage: 3.6V fixed
Output current capacity: 150mA minimum
Input voltage rating: 16V maximum
Package type: SOT-23-5 surface mount
Operating temperature range: -40°C to 125°C
Control and protection feature set: Enable control with over-current, over-temperature, and short-circuit protection

Substitute parts are grouped into two categories based on manufacturer designation and product status:

Parametric Equivalents (Texas Instruments): LP2985AIM5-3.6/NOPB and LP2985IM5-3.6/NOPB maintain identical electrical specifications and are direct functional replacements with active product status.

Parametric Equivalent (National Semiconductor): LP2985AIM5X-3.6/NOPB provides equivalent performance with active product status.

Manufacturer-Recommended Alternative (Microchip Technology): MIC5205-3.6YM5-TR offers equivalent output voltage and current capacity with enhanced performance characteristics in specific parameters.

Parameter Comparison

Parameter	LP2985IM5X-3.6	LP2985AIM5-3.6/NOPB	LP2985AIM5X-3.6/NOPB	LP2985IM5-3.6/NOPB	MIC5205-3.6YM5-TR
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active
Output Voltage	3.6V	3.6V	3.6V	3.6V	3.6V
Output Current	150mA	150mA	150mA	150mA	150mA
Input Voltage (Max)	16V	16V	16V	16V	16V
Voltage Dropout (Max)	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	150 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	75dB (100Hz)
Package Type	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
RoHS Status	Non-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, Reverse Polarity

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents): LP2985AIM5-3.6/NOPB, LP2985AIM5X-3.6/NOPB, and LP2985IM5-3.6/NOPB are recommended as primary substitutes due to active product status and identical electrical specifications. All three parts maintain ROHS3 compliance, addressing the non-compliance status of the obsolete LP2985IM5X-3.6. These parts are functionally interchangeable with identical performance characteristics across all critical parameters.

Alternative Substitute (Enhanced Performance): MIC5205-3.6YM5-TR from Microchip Technology provides equivalent core functionality with improved performance in specific areas. This part features lower voltage dropout (0.35V versus 0.58V) and higher PSRR (75dB at 100Hz versus 45dB at 1kHz). The quiescent current is higher at 150 µA compared to 95 µA in the primary substitutes. This part includes reverse polarity protection in addition to standard protection features. Selection of this alternative is appropriate when lower dropout voltage or superior noise rejection is required by the application.

Compliance Consideration: All active substitute parts are ROHS3 compliant, providing regulatory advantage over the obsolete non-compliant original part.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-3.6/NOPB be used as a direct replacement for LP2985IM5X-3.6?

A: Yes. Both parts share identical electrical specifications including 3.6V output, 150mA current capacity, 0.58V maximum dropout voltage, and 95 µA quiescent current. The primary difference is product status: LP2985AIM5-3.6/NOPB is active with ROHS3 compliance, while LP2985IM5X-3.6 is obsolete and non-compliant. Packaging is SOT-23-5 for both parts.

Q: What is the difference between LP2985IM5-3.6/NOPB and LP2985AIM5-3.6/NOPB?

A: Both parts are Texas Instruments products with identical electrical specifications. The primary difference is packaging format: LP2985IM5-3.6/NOPB is supplied in Cut Tape and Digi-Reel format, while LP2985AIM5-3.6/NOPB is supplied in Tape & Reel format. Electrical performance and SOT-23-5 package type are identical.

Q: When should MIC5205-3.6YM5-TR be selected over the LP2985 alternatives?

A: MIC5205-3.6YM5-TR should be selected when the application requires lower voltage dropout (0.35V versus 0.58V) or superior power supply rejection ratio (75dB at 100Hz versus 45dB at 1kHz). The higher quiescent current (150 µA versus 95 µA) should be evaluated for battery-powered or low-power applications. This part also provides reverse polarity protection.

Q: Are all substitute parts compatible with the original SOT-23-5 footprint?

A: Yes. All substitute parts use SOT-23-5 (SC-74A) surface mount packaging and are footprint-compatible with the original LP2985IM5X-3.6.

Q: What is the significance of the /NOPB designation?

A: The /NOPB designation indicates the part is supplied without plumbum (lead-free), confirming ROHS3 compliance. This is relevant for applications requiring regulatory compliance with lead-free component requirements.

Q: Can LP2985AIM5X-3.6/NOPB from National Semiconductor be mixed with Texas Instruments parts in production?

A: Yes. LP2985AIM5X-3.6/NOPB maintains identical electrical specifications and SOT-23-5 packaging. However, sourcing from different manufacturers may introduce supply chain considerations. Verify with your procurement process for any qualification requirements.

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