LP2985AIM5-2.5 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-2.5 is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 2.5V output at 150mA with low dropout characteristics. This device operates across an input voltage range up to 16V and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The part is packaged in SOT-23-5 (SC-74A) surface-mount configuration with enable control functionality.

The LP2985AIM5-2.5 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator topology.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	2.5	V
Output Current	150	mA
Input Voltage (Maximum)	16	V
Dropout Voltage (Maximum)	0.58	V @ 150mA
Quiescent Current	95	µA
Supply Current (Maximum)	2.5	mA
PSRR	45	dB @ 1kHz
Operating Temperature Range	-40 to 125	°C
Package Type	SOT-23-5	SC-74A
Mounting Type	Surface Mount
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP2985AIM5-2.5 are classified based on electrical parameter equivalence and product status. The primary substitution criteria are:

Critical Matching Parameters:

Fixed output voltage: 2.5V
Output current capability: 150mA
Maximum input voltage: 16V
Dropout voltage: 0.58V @ 150mA
Package: SOT-23-5 (SC-74A)
Quiescent current: 95µA
Operating temperature range: -40°C to 125°C
Control features: Enable function
Protection: Over-current, over-temperature, short-circuit

Grouping Categories:

Group 1: Texas Instruments LP2985 Series (Active Status) Parts with active product status and RoHS3 compliance. These represent the primary substitution path for obsolete LP2985AIM5-2.5 units.

Group 2: Texas Instruments LP2985 Series (Packaging Variants) Parts with identical electrical specifications but different packaging formats (Cut Tape, Tape & Reel, Digi-Reel).

Group 3: National Semiconductor LP2985A (Cross-Manufacturer Equivalent) Functionally equivalent part with identical electrical parameters and SOT-23-5 packaging.

Group 4: STMicroelectronics LD2985BM25R (Manufacturer-Recommended Alternative) Alternative from different manufacturer with equivalent electrical performance and RoHS3 compliance. Minor parameter variations in quiescent current (150µA vs 95µA) and supply current (4mA vs 2.5mA) are within acceptable tolerance for this device class.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2985AIM5-2.5	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Obsolete	Non-compliant
LP2985-25DBVR	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-25DBVT	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-25DBVR	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-25DBVT	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985AIM5-2.5/NOPB	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5X-2.5/NOPB	National Semiconductor	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Active	Not specified
LP2985IM5-2.5	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985IM5-2.5/NOPB	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-2.5/NOPB	Texas Instruments	2.5V	150mA	0.58V @ 150mA	95µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM25R	STMicroelectronics	2.5V	150mA	0.575V @ 150mA	150µA	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitution Path (Recommended):

For new designs and ongoing production, select from active-status Texas Instruments LP2985 series parts with RoHS3 compliance:

LP2985-25DBVR (Cut Tape & Digi-Reel packaging)
LP2985-25DBVT (Tape & Reel packaging)
LP2985A-25DBVR (Cut Tape & Digi-Reel packaging)
LP2985AIM5-2.5/NOPB (Cut Tape & Digi-Reel packaging)
LP2985IM5-2.5/NOPB (Cut Tape & Digi-Reel packaging)
LP2985IM5X-2.5/NOPB (Tape & Reel packaging)

These parts maintain identical electrical specifications and are RoHS3 compliant, eliminating regulatory compliance concerns associated with the obsolete LP2985AIM5-2.5.

Secondary Substitution Path:

LP2985A-25DBVT is designated Last Time Buy status. This part remains functionally equivalent but represents a transitional option with limited future availability.

Cross-Manufacturer Alternative:

LD2985BM25R (STMicroelectronics) provides functional equivalence with RoHS3 compliance. This part exhibits minor parameter variations: quiescent current of 150µA (versus 95µA) and maximum supply current of 4mA (versus 2.5mA). These differences are within acceptable operational tolerance for linear regulator applications and do not affect core functionality or thermal performance in typical circuit implementations.

Packaging Considerations:

Select packaging format based on assembly requirements:

Cut Tape & Digi-Reel: Manual or semi-automated assembly
Tape & Reel: Automated pick-and-place assembly

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-2.5 be directly replaced with LP2985-25DBVR?

A: Yes. Both parts deliver identical electrical performance: 2.5V fixed output, 150mA current capability, 0.58V dropout voltage, and SOT-23-5 packaging. The primary difference is product status—LP2985-25DBVR is active with RoHS3 compliance, while LP2985AIM5-2.5 is obsolete and RoHS non-compliant. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between LP2985-25DBVR and LP2985A-25DBVR?

A: Both parts are electrically identical with matching output voltage, current rating, dropout voltage, and quiescent current specifications. The designation difference (LP2985 versus LP2985A) reflects internal die revision or manufacturing process updates. Both are RoHS3 compliant and active status. Selection between these variants depends on packaging preference (Digi-Reel versus standard Cut Tape).

Q: Is LD2985BM25R a suitable replacement for LP2985AIM5-2.5?

A: Yes, with noted parameter variations. LD2985BM25R is manufactured by STMicroelectronics and provides equivalent 2.5V output at 150mA with SOT-23-5 packaging. The quiescent current is 150µA (versus 95µA in the original) and maximum supply current is 4mA (versus 2.5mA). These differences result in slightly higher standby power consumption but do not affect core regulator functionality. This part is RoHS3 compliant and active status.

Q: What does "Last Time Buy" status mean for LP2985A-25DBVT?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part number. Existing inventory is available for purchase, but no future production is planned. This part remains functionally equivalent and RoHS3 compliant. For long-term supply security, transition to active-status alternatives such as LP2985-25DBVR or LP2985IM5-2.5/NOPB.

Q: Are there packaging differences between LP2985IM5-2.5 and LP2985IM5-2.5/NOPB?

A: Both parts are electrically identical with matching electrical specifications. The "/NOPB" suffix indicates lead-free (no-lead) packaging and RoHS3 compliance. LP2985IM5-2.5 is obsolete, while LP2985IM5-2.5/NOPB is active status. For new designs, specify the /NOPB variant to ensure regulatory compliance and supply continuity.

Q: Can I use LP2985AIM5X-2.5/NOPB as a substitute?

A: Yes. This National Semiconductor part is electrically equivalent to LP2985AIM5-2.5 with identical output voltage, current rating, dropout voltage, and SOT-23-5 packaging. It is active status. However, RoHS and REACH compliance status are not specified in available documentation. Verify compliance requirements with your supply chain before selection.

Q: What is the significance of the "M5" designation in part numbers?

A: The "M5" indicates the specific package variant—SOT-23-5 (5-pin small-outline transistor package). This is the standard surface-mount package for this regulator family. All substitute parts listed use identical SOT-23-5 packaging, ensuring mechanical and electrical compatibility.

Q: Should I prioritize active-status parts over obsolete alternatives?

A: Yes. Active-status parts ensure long-term supply availability and manufacturer support. Obsolete parts (LP2985AIM5-2.5, LP2985IM5-2.5) have limited remaining inventory and no future production. For production designs, specify active-status equivalents such as LP2985-25DBVR, LP2985A-25DBVR, or LP2985IM5-2.5/NOPB to maintain supply chain continuity.

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