LP2985IM5X-4.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5X-4.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 4V 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 LP2985 series provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable 4V output from input sources up to 16V.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	4V
Output Current	150mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Package	SOT-23-5 (SC-74A, SOT-753)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2985IM5X-4.0 is based on strict electrical and mechanical parameter matching within the LP2985 family. All substitute parts maintain identical output voltage (4V fixed), output current (150mA), input voltage rating (16V maximum), voltage dropout characteristics (0.58V @ 150mA), quiescent current (95 µA), PSRR (45dB at 1kHz), protection features, control features, and SOT-23-5 package specification.

The key parameters determining substitution eligibility are:

Fixed output voltage: 4V
Maximum output current: 150mA
Maximum input voltage: 16V
Voltage dropout: 0.58V @ 150mA
Package type: SOT-23-5
Protection and control feature set

Differences between substitute parts are limited to product status (active vs. obsolete), RoHS compliance status, and packaging format (Cut Tape & Digi-Reel versus Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout	Quiescent Current	PSRR	Package	RoHS Status	Inventory
LP2985IM5X-4.0	Texas Instruments	Obsolete	4V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	Non-compliant	4250 Pcs
LP2985AIM5-4.0/NOPB	Texas Instruments	Active	4V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	ROHS3 Compliant	1612 Pcs
LP2985AIM5X-4.0/NOPB	Texas Instruments	Active	4V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	ROHS3 Compliant	5731 Pcs
LP2985IM5-4.0/NOPB	Texas Instruments	Active	4V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	ROHS3 Compliant	2100 Pcs
LP2985IM5X-4.0/NOPB	Texas Instruments	Active	4V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	SOT-23-5	ROHS3 Compliant	4205 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical compatibility with the LP2985IM5X-4.0. Selection between active alternatives should prioritize parts with ROHS3 compliance status, as the original part is RoHS non-compliant. LP2985IM5X-4.0/NOPB and LP2985AIM5X-4.0/NOPB are recommended as primary substitutes due to active product status and ROHS3 compliance. LP2985AIM5-4.0/NOPB and LP2985IM5-4.0/NOPB are functionally equivalent alternatives with identical electrical specifications and active status. Packaging format differences (Cut Tape & Digi-Reel versus Tape & Reel) do not affect electrical performance and should be selected based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-4.0/NOPB directly replace LP2985IM5X-4.0?

A: Yes. Both parts share identical electrical specifications including 4V fixed output, 150mA output current, 16V maximum input voltage, 0.58V dropout voltage, and SOT-23-5 packaging. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What is the difference between LP2985IM5X-4.0/NOPB and LP2985AIM5X-4.0/NOPB?

A: Both parts are electrically identical with 4V output, 150mA current, and SOT-23-5 package. The difference lies in the part designation prefix (I versus AI) and packaging format. Both are active and ROHS3 compliant.

Q: Are there any package compatibility concerns when substituting?

A: No. All substitute parts use the same SOT-23-5 package (SC-74A, SOT-753 designation). Pin configuration, footprint, and mounting requirements are identical across all listed alternatives.

Q: Why is the original LP2985IM5X-4.0 marked as obsolete?

A: The original part is classified as obsolete by Texas Instruments. Active alternatives within the LP2985 family provide identical functionality and are recommended for new designs and ongoing procurement.

Q: Do all substitute parts have the same protection features?

A: Yes. All parts include over-current, over-temperature, and short-circuit protection with enable control features. PSRR performance (45dB at 1kHz) and quiescent current (95 µA) are identical across all alternatives.

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

A: The /NOPB suffix indicates lead-free (Pb-free) packaging and RoHS compliance. Parts with this designation are ROHS3 compliant, making them suitable for applications requiring RoHS certification.

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