LP2985AIM5-2.7 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-2.7 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current at a fixed 2.7V output with a maximum dropout voltage of 0.58V at full load. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Number of Regulators	1
Voltage - Output (Min/Fixed)	2.7V
Voltage - Input (Max)	16V
Current - Output	150mA
Voltage Dropout (Max)	0.58V @ 150mA
Current - Quiescent (Iq)	95 µA
PSRR	45dB (1kHz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2985AIM5-2.7 is determined by strict alignment of the following critical parameters:

Output voltage: 2.7V fixed
Output current capability: 150mA minimum
Maximum input voltage: 16V or greater
Package type: SOT-23-5 (SC-74A, SOT-753)
Output configuration: Positive fixed regulator
Protection features: Over current, over temperature, short circuit protection
Control features: Enable function

The LP2985IM5-2.7/NOPB qualifies as a parametric equivalent based on identical electrical specifications across all critical parameters. This part maintains the same output voltage, current rating, dropout voltage, quiescent current, PSRR, protection features, and package configuration. The primary distinction is packaging format (Cut Tape & Digi-Reel versus standard packaging) and improved RoHS compliance status.

Parameter Comparison

Parameter	LP2985AIM5-2.7	LP2985IM5-2.7/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	2.7V	2.7V
Output Current	150mA	150mA
Input Voltage (Max)	16V	16V
Dropout Voltage (Max)	0.58V @ 150mA	0.58V @ 150mA
Quiescent Current	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C
Package	SOT-23-5	SOT-23-5
Product Status	Obsolete	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The LP2985IM5-2.7/NOPB is the direct parametric equivalent for the LP2985AIM5-2.7. Both parts are classified as obsolete products from Texas Instruments. The substitute part maintains identical electrical performance across all specified parameters, including output voltage, current capacity, dropout voltage, quiescent current, and protection features.

A key distinction exists in regulatory compliance: the LP2985IM5-2.7/NOPB achieves ROHS3 compliance, whereas the original LP2985AIM5-2.7 is RoHS non-compliant. For applications subject to RoHS requirements or environmental regulations, the substitute part provides improved compliance status while maintaining full electrical equivalence.

Both parts operate within the same temperature range (-40°C to 125°C) and utilize identical SOT-23-5 packaging, ensuring mechanical and thermal compatibility in existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can LP2985IM5-2.7/NOPB be used as a direct replacement for LP2985AIM5-2.7?

A: Yes. The LP2985IM5-2.7/NOPB is a parametric equivalent with identical electrical specifications. All critical parameters—output voltage, current rating, dropout voltage, quiescent current, PSRR, protection features, and operating temperature range—are identical. The parts are pin-compatible and use the same SOT-23-5 package.

Q: What is the difference between these two part numbers?

A: The primary differences are packaging format and RoHS compliance status. The LP2985IM5-2.7/NOPB is supplied in Cut Tape and Digi-Reel packaging formats and meets ROHS3 compliance requirements, while the LP2985AIM5-2.7 uses standard packaging and is RoHS non-compliant. Electrical performance is identical.

Q: Are there any PCB layout considerations when substituting these parts?

A: No. Both parts use the SOT-23-5 package (SC-74A, SOT-753), ensuring identical pinout and footprint compatibility. No PCB modifications are required for substitution.

Q: Why is the original part marked as obsolete?

A: Both the LP2985AIM5-2.7 and LP2985IM5-2.7/NOPB are classified as obsolete products by Texas Instruments. This status indicates that these devices are no longer in active production. For new designs or long-term production requirements, consultation with Texas Instruments regarding current alternative linear regulator solutions may be necessary.

Q: Does the RoHS compliance difference affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical performance. The ROHS3-compliant LP2985IM5-2.7/NOPB delivers identical electrical characteristics to the non-compliant LP2985AIM5-2.7.

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