LP2987IMMX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2987IMMX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 3.3V at 200mA output current with a maximum dropout voltage of 0.35V at full load. The part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement.

The LP2987IMMX-3.3 integrates over-current, over-temperature, and short-circuit protection features, making it suitable for micropower applications requiring regulated 3.3V rails. The 8-VSSOP surface-mount package provides compact integration in space-constrained designs.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	200mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.35V @ 200mA
Quiescent Current	120 µA
PSRR	65dB (1kHz)
Operating Temperature Range	-40°C to 125°C
Package Type	8-VSSOP (8-TSSOP, 8-MSOP, 0.118", 3.00mm Width)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution of the LP2987IMMX-3.3 is determined by strict equivalence across the following critical parameters:

Output Specifications: All substitute parts deliver identical fixed 3.3V output at 200mA maximum current, with matching 0.35V maximum dropout voltage at full load.

Electrical Performance: Quiescent current (120 µA), power supply rejection ratio (65dB at 1kHz), and supply current (3.7 mA max) are identical across all qualified substitutes.

Package and Mounting: All substitute parts use the 8-VSSOP package configuration with surface-mount technology, maintaining mechanical and thermal compatibility.

Operating Environment: All parts operate across the -40°C to 125°C temperature range with identical protection mechanisms (over-current, over-temperature, short-circuit).

Input Voltage Rating: Maximum input voltage of 16V is consistent across all substitutes.

Substitutes are grouped into two categories: direct manufacturer equivalents (same part number with different suffixes) and parametric equivalents (different base part numbers with identical electrical and mechanical specifications).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	PSRR	Operating Temp	Package	RoHS Status	Inventory (Pcs)
LP2987IMMX-3.3	Texas Instruments	Obsolete	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	Non-compliant	2500
LP2987IMMX-3.3/NOPB	Texas Instruments	Active	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	ROHS3 Compliant	1189
LP2987IMM-3.3/NOPB	National Semiconductor	Active	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	Not specified	2654
LP2986AIMM-3.3/NOPB	Texas Instruments	Active	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	ROHS3 Compliant	2000
LP2986IMM-3.3/NOPB	National Semiconductor	Active	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	Not specified	1814
LP2988AIMM-3.3/NOPB	Texas Instruments	Active	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	ROHS3 Compliant	2220
LP2988IMM-3.3/NOPB	Texas Instruments	Active	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	ROHS3 Compliant	1093
LP2988IMMX-3.3/NOPB	Texas Instruments	Active	3.3V	200mA	0.35V @ 200mA	120 µA	65dB (1kHz)	-40°C to 125°C	8-VSSOP	ROHS3 Compliant	4420

Engineering Selection Recommendations

Primary Recommendation: LP2987IMMX-3.3/NOPB is the direct equivalent of the obsolete LP2987IMMX-3.3. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The /NOPB suffix indicates lead-free manufacturing, aligning with current environmental regulations.

Secondary Recommendations: LP2988IMMX-3.3/NOPB and LP2988AIMM-3.3/NOPB are parametric equivalents from the LP2988 series. These parts deliver identical performance across all critical parameters and offer the highest inventory availability (4420 and 2220 units respectively). Both are ROHS3 compliant and actively supported by Texas Instruments.

Alternative Options: LP2986AIMM-3.3/NOPB and LP2986IMM-3.3/NOPB provide equivalent functionality from the LP2986 series. These parts maintain full electrical and mechanical compatibility while offering active product status.

Compliance Consideration: All recommended active substitutes carry ROHS3 compliance certification, addressing regulatory requirements for new designs. The original LP2987IMMX-3.3 is marked as RoHS non-compliant and obsolete, making transition to compliant alternatives necessary for ongoing production.

Inventory Availability: LP2988IMMX-3.3/NOPB offers the highest stock level (4420 units), followed by LP2987IMM-3.3/NOPB (2654 units) and LP2986AIMM-3.3/NOPB (2000 units), supporting procurement planning for volume applications.

Frequently Asked Questions (FAQ)

Q: Can LP2987IMMX-3.3/NOPB directly replace the obsolete LP2987IMMX-3.3?

A: Yes. LP2987IMMX-3.3/NOPB is the direct active equivalent with identical electrical specifications, package configuration, and performance characteristics. The only differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between LP2987, LP2986, and LP2988 series parts?

A: All three series (LP2987, LP2986, LP2988) deliver identical electrical performance for the 3.3V 200mA configuration specified. The series designation reflects different internal design generations or manufacturing processes, but functional equivalence is maintained across all parameters provided in this reference.

Q: Are the LP2988 series parts suitable replacements for LP2987IMMX-3.3?

A: Yes. LP2988IMMX-3.3/NOPB and LP2988AIMM-3.3/NOPB are parametric equivalents with matching output voltage, current rating, dropout voltage, quiescent current, PSRR, operating temperature range, and package type. These parts are actively manufactured and widely available.

Q: Does the /NOPB suffix affect electrical performance?

A: No. The /NOPB suffix indicates lead-free (Pb-free) manufacturing and does not alter electrical specifications or performance. It reflects compliance with RoHS directives.

Q: Are all substitute parts available in the same 8-VSSOP package?

A: Yes. All substitute parts listed use the 8-VSSOP package configuration (also designated as 8-TSSOP or 8-MSOP with 0.118" width and 3.00mm body width). Pin-to-pin compatibility is maintained across all substitutes.

Q: What protection features are included in all substitute parts?

A: All substitute parts include over-current protection, over-temperature protection, and short-circuit protection. Enable control functionality is also present across all variants.

Q: Can I use National Semiconductor LP2987IMM-3.3/NOPB or LP2986IMM-3.3/NOPB as substitutes?

A: Yes. Both National Semiconductor parts are parametric equivalents with identical electrical and mechanical specifications. However, Texas Instruments variants (LP2987IMMX-3.3/NOPB, LP2988 series) offer active product status and explicit ROHS3 compliance certification.

Q: What is the maximum input voltage for all substitute parts?

A: All substitute parts accept a maximum input voltage of 16V, matching the original LP2987IMMX-3.3 specification.

Q: Are there any differences in quiescent current or PSRR between substitutes?

A: No. All substitute parts maintain identical quiescent current (120 µA) and power supply rejection ratio (65dB at 1kHz) specifications.

Q: Which substitute offers the best inventory availability?

A: LP2988IMMX-3.3/NOPB offers the highest inventory level at 4420 units in stock, followed by LP2987IMM-3.3/NOPB at 2654 units.

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