LP2985IM5X-3.0 Equivalent & Substitute Parts

Part Overview

The LP2985IM5X-3.0 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides positive fixed output regulation with integrated enable control and comprehensive protection features including over-current, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	3V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LP2985IM5X-3.0 is determined by strict equivalence across the following critical parameters: fixed 3V output voltage, 150mA output current capability, 16V maximum input voltage, SOT-23-5 package form factor, -40°C to 125°C operating temperature range, and integrated enable control with over-current, over-temperature, and short-circuit protection.

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LP2985 Series): Parts that maintain identical electrical specifications and are direct functional replacements. These include LP2985-30DBVR, LP2985-30DBVT, LP2985A-30DBVR, LP2985A-30DBVT, LP2985AIM5-3.0/NOPB, LP2985AIM5X-3.0/NOPB, LP2985IM5-3.0/NOPB, and LP2985IM5X-3.0/NOPB. Differences exist only in packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active vs. Last Time Buy).

Manufacturer Recommended Alternatives: Parts from alternative manufacturers that meet the core electrical and mechanical requirements. LD2985BM30R from STMicroelectronics provides equivalent performance with minor variations in quiescent current (150 µA vs. 95 µA) and maximum supply current (4 mA vs. 2.5 mA). LT1761ES5-3#TRMPBF from Analog Devices Inc. operates at 100mA output current (lower than 150mA) but offers superior dropout voltage (0.45V @ 100mA) and higher PSRR (65dB @ 120Hz).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2985IM5X-3.0	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	Non-compliant
LP2985-30DBVR	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-30DBVT	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-30DBVR	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-30DBVT	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5-3.0/NOPB	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5X-3.0/NOPB	National Semiconductor	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	Not specified
LP2985IM5-3.0/NOPB	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-3.0/NOPB	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM30R	STMicroelectronics	3V	150mA	16V	0.575V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
LT1761ES5-3#TRMPBF	Analog Devices Inc.	3V	100mA	20V	0.45V @ 100mA	Not specified	TSOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete LP2985IM5X-3.0, select from the active Texas Instruments LP2985 series variants: LP2985-30DBVR, LP2985A-30DBVR, LP2985A-30DBVT, LP2985AIM5-3.0/NOPB, LP2985IM5-3.0/NOPB, or LP2985IM5X-3.0/NOPB. These maintain identical electrical performance and are ROHS3 compliant. Selection among these variants depends on packaging requirements: Digi-Reel format for LP2985-30DBVR, Cut Tape for LP2985-30DBVT, or Tape & Reel for the remaining options.

The STMicroelectronics LD2985BM30R is suitable when supply chain constraints limit Texas Instruments availability. It delivers equivalent 150mA output current and maintains the same 3V fixed output and SOT-23-5 package. The higher quiescent current (150 µA vs. 95 µA) and maximum supply current (4 mA vs. 2.5 mA) are acceptable for most applications but should be evaluated in power-sensitive designs.

The Analog Devices LT1761ES5-3#TRMPBF is appropriate only for applications requiring less than 100mA output current. Its superior dropout voltage and PSRR make it preferable in noise-sensitive or low-headroom applications, but the reduced current capability and TSOT-23-5 package variant limit its use as a general replacement.

Frequently Asked Questions (FAQ)

Q: Can LP2985IM5X-3.0 be replaced with any LP2985 variant?

A: Yes, all LP2985 variants listed maintain identical electrical specifications: 3V fixed output, 150mA current capability, 0.58V dropout voltage, and SOT-23-5 package. Differences are limited to packaging format (Cut Tape, Digi-Reel, Tape & Reel) and product status (Active vs. Last Time Buy). Selection depends on your procurement and assembly requirements.

Q: What is the difference between LP2985 and LP2985A?

A: Both variants deliver identical electrical performance. The "A" designation indicates a later product revision. Both are suitable replacements for the obsolete LP2985IM5X-3.0.

Q: Is LD2985BM30R a direct replacement?

A: LD2985BM30R from STMicroelectronics is functionally equivalent for most applications. It maintains 150mA output current, 3V fixed output, and SOT-23-5 package. The quiescent current is higher (150 µA vs. 95 µA) and maximum supply current is higher (4 mA vs. 2.5 mA). Evaluate these differences in power-budget-critical designs.

Q: Can LT1761ES5-3#TRMPBF replace LP2985IM5X-3.0?

A: LT1761ES5-3#TRMPBF is not a direct replacement. It is rated for 100mA maximum output current, below the 150mA requirement of the original part. Use this part only in applications requiring 100mA or less. Its TSOT-23-5 package is a thin variant of SOT-23-5 and may require PCB layout verification.

Q: What does RoHS compliance mean for this part?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. The original LP2985IM5X-3.0 is RoHS non-compliant. All active substitute parts are ROHS3 compliant, making them suitable for applications with RoHS requirements.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly. LP2985AIM5-3.0/NOPB has 23,780 pcs available, while LP2985IM5-3.0/NOPB has only 3,100 pcs. Verify current availability with your supplier before finalizing part selection.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT), Digi-Reel, and Tape & Reel formats contain identical die and deliver identical electrical performance. Packaging format affects only handling, storage, and assembly processes.

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