LP2985IM5-2.9 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5-2.9 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This Surface Mount device delivers 150mA output current with a fixed 2.9V output and operates across an input range up to 16V. 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
Voltage - Output (Min/Fixed)	2.9V
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
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LP2985IM5-2.9 is determined by strict alignment of electrical and mechanical parameters. The following criteria define valid equivalents:

Fixed output voltage of 2.9V
Minimum output current rating of 150mA
Maximum input voltage of 16V or greater
Voltage dropout specification of 0.58V @ 150mA or lower
Quiescent current of 95 µA or lower
Enable control feature
Over Current, Over Temperature, and Short Circuit protection
Operating temperature range of -40°C to 125°C or wider
SOT-23-5 package configuration
Surface Mount mounting type

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (same manufacturer, identical electrical specifications) and Parametric Equivalents (alternative manufacturers with matching or superior electrical performance).

Parameter Comparison

Parameter	LP2985IM5-2.9	LP2985IM5-2.9/NOPB	LP2985A-29DBVR	LP2985AIM5-2.9/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	2.9V	2.9V	2.9V	2.9V
Input Voltage (Max)	16V	16V	16V	16V
Output Current	150mA	150mA	150mA	150mA
Voltage Dropout (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA
Quiescent Current (Iq)	95 µA	95 µA	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
Control Features	Enable	Enable	Enable	Enable
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
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Product Status	Obsolete	Obsolete	Active	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the LP2985IM5-2.9, the following selection criteria apply:

Active Product Status Priority: LP2985A-29DBVR is the recommended primary substitute. This part maintains identical electrical specifications while offering Active product status, ensuring long-term availability and manufacturing support. It carries ROHS3 compliance certification.

Obsolete Product Alternatives: LP2985IM5-2.9/NOPB and LP2985AIM5-2.9/NOPB provide direct electrical equivalence with ROHS3 compliance. These parts are suitable for applications where existing inventory must be managed or where design flexibility permits use of obsolete-status components.

Compliance Consideration: The original LP2985IM5-2.9 is RoHS non-compliant. All listed substitutes achieve ROHS3 compliance, supporting modern manufacturing and environmental regulatory requirements.

Packaging Variants: LP2985IM5-2.9/NOPB is supplied in Cut Tape (CT) & Digi-Reel® packaging. LP2985A-29DBVR and LP2985AIM5-2.9/NOPB are supplied in Tape & Reel (TR) packaging. Selection depends on production volume and assembly line requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2985A-29DBVR directly replace LP2985IM5-2.9 in existing designs?

A: Yes. LP2985A-29DBVR provides identical electrical performance across all specified parameters: 2.9V fixed output, 150mA output current, 0.58V maximum dropout voltage, 95 µA quiescent current, and SOT-23-5 package configuration. The part is pin-compatible and functionally equivalent.

Q: What is the difference between LP2985IM5-2.9/NOPB and LP2985AIM5-2.9/NOPB?

A: Both parts deliver identical electrical specifications. The primary difference is packaging format: LP2985IM5-2.9/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format, while LP2985AIM5-2.9/NOPB is supplied in Tape & Reel (TR) format. Selection depends on production volume and assembly equipment compatibility.

Q: Why is product status important for this regulator?

A: The original LP2985IM5-2.9 is Obsolete, meaning Texas Instruments no longer manufactures or supports this part. LP2985A-29DBVR carries Active status, guaranteeing continued manufacturing, technical support, and long-term availability. For new designs or production continuity, Active-status parts are preferred.

Q: Are all substitute parts RoHS compliant?

A: All listed substitutes achieve ROHS3 compliance. The original LP2985IM5-2.9 is RoHS non-compliant. If RoHS compliance is required for your application, use LP2985A-29DBVR, LP2985IM5-2.9/NOPB, or LP2985AIM5-2.9/NOPB.

Q: Can I use these regulators in applications requiring higher output current?

A: No. All listed parts are rated for 150mA maximum output current. Applications requiring higher current must use alternative regulator designs with higher current ratings.

Q: What protection features are included in these regulators?

A: All parts include Over Current, Over Temperature, and Short Circuit protection. These features safeguard the regulator and downstream circuitry against fault conditions.

Q: Is the SOT-23-5 package suitable for my PCB layout?

A: SOT-23-5 is a standard Surface Mount package with five leads. Verify your PCB design accommodates this footprint. All listed substitutes use identical SOT-23-5 packaging, ensuring mechanical compatibility.

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