LP2989ILD-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP2989ILD-3.3 is a micropower linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 500mA in an 8-WSON (4x4) surface mount package. This device is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The regulator integrates enable control, over-current protection, over-temperature protection, and short-circuit protection, suitable for low-noise applications requiring stable 3.3V rails with minimal quiescent current.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	500mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.65V @ 500mA
Quiescent Current	175 µA
PSRR	60dB (1kHz)
Package	8-WSON (4x4)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts for the LP2989ILD-3.3 are identified based on strict parametric equivalence across the following criteria:

Fixed output voltage of 3.3V
Output current capability of 500mA
Maximum input voltage of 16V
Dropout voltage of 0.65V @ 500mA
Quiescent current of 175 µA
PSRR of 60dB (1kHz)
Identical protection features (Over Current, Over Temperature, Short Circuit)
Enable control functionality
8-WSON (4x4) package with exposed pad
Operating temperature range of -40°C to 125°C

All substitute parts listed maintain these electrical and mechanical specifications, ensuring direct functional replacement in existing designs.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR	Package	RoHS Status	Inventory
LP2989ILD-3.3	Texas Instruments	Obsolete	3.3V	500mA	16V	0.65V @ 500mA	175 µA	60dB (1kHz)	8-WSON (4x4)	Non-compliant	2040 Pcs
LP2989AILD-3.3/NOPB	National Semiconductor	Active	3.3V	500mA	16V	0.65V @ 500mA	175 µA	60dB (1kHz)	8-WSON (4x4)	Not specified	16885 Pcs
LP2989ILD-3.3/NOPB	Texas Instruments	Last Time Buy	3.3V	500mA	16V	0.65V @ 500mA	175 µA	60dB (1kHz)	8-WSON (4x4)	ROHS3 Compliant	3342 Pcs
LP2989ILDX-3.3/NOPB	Texas Instruments	Active	3.3V	500mA	16V	0.65V @ 500mA	175 µA	60dB (1kHz)	8-WSON (4x4)	ROHS3 Compliant	924 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete LP2989ILD-3.3, the following selection criteria apply:

Active Product Status Priority: LP2989ILDX-3.3/NOPB is the preferred substitute, maintaining Active product status with ROHS3 compliance and long-term availability assurance.

Compliance Requirements: LP2989ILD-3.3/NOPB and LP2989ILDX-3.3/NOPB both meet ROHS3 compliance requirements, suitable for regulated markets. LP2989AILD-3.3/NOPB provides an alternative from National Semiconductor with Active status and higher inventory availability (16885 Pcs).

Packaging Considerations: LP2989ILD-3.3/NOPB is supplied in Cut Tape (CT) packaging with MSL 3 (168 Hours). LP2989ILDX-3.3/NOPB is supplied in Tape & Reel (TR) packaging with MSL 3 (168 Hours). Both maintain identical electrical performance and 8-WSON (4x4) package specifications.

Inventory Availability: LP2989AILD-3.3/NOPB offers the highest inventory level at 16885 Pcs, followed by LP2989ILD-3.3/NOPB at 3342 Pcs and LP2989ILDX-3.3/NOPB at 924 Pcs.

Frequently Asked Questions (FAQ)

Q: Can LP2989ILDX-3.3/NOPB directly replace LP2989ILD-3.3 in existing designs?

A: Yes. Both parts share identical electrical specifications (3.3V output, 500mA current, 0.65V dropout, 175 µA quiescent current, 60dB PSRR) and the same 8-WSON (4x4) package with exposed pad. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard).

Q: What is the difference between LP2989ILD-3.3/NOPB and LP2989ILDX-3.3/NOPB?

A: Both are Texas Instruments products with identical electrical performance. LP2989ILD-3.3/NOPB is Last Time Buy status in Cut Tape packaging. LP2989ILDX-3.3/NOPB is Active status in Tape & Reel packaging. The "X" designation indicates the Tape & Reel format.

Q: Is LP2989AILD-3.3/NOPB from National Semiconductor compatible?

A: Yes. This part maintains all electrical and mechanical specifications of the LP2989ILD-3.3, including output voltage, current rating, dropout voltage, quiescent current, PSRR, and 8-WSON (4x4) package. It is currently Active with the highest inventory availability.

Q: What are the MSL (Moisture Sensitivity Level) differences?

A: LP2989ILD-3.3 has MSL 1 (Unlimited). LP2989ILD-3.3/NOPB and LP2989ILDX-3.3/NOPB both have MSL 3 (168 Hours), requiring controlled storage and handling conditions. This difference does not affect electrical performance but impacts storage and assembly procedures.

Q: Are all substitute parts RoHS compliant?

A: LP2989ILD-3.3/NOPB and LP2989ILDX-3.3/NOPB are ROHS3 compliant. LP2989AILD-3.3/NOPB RoHS status is not specified in the provided data. The original LP2989ILD-3.3 is RoHS non-compliant.

Q: Which substitute should be selected for new designs?

A: LP2989ILDX-3.3/NOPB is recommended for new designs due to Active product status, ROHS3 compliance, and long-term availability. For high-volume requirements, LP2989AILD-3.3/NOPB offers superior inventory availability with equivalent electrical specifications.

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