LP2982IM5-3.3 Equivalent & Substitute Parts

Part Overview

The LP2982IM5-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 50mA in a SOT-23-5 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable 3.3V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	50mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.33V @ 80mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2982IM5-3.3 is determined by the following critical parameters: fixed 3.3V output voltage, 50mA output current capability, SOT-23-5 package compatibility, 16V maximum input voltage rating, and integrated protection features (over-current, over-temperature, short-circuit). Parts are grouped into two categories based on electrical performance characteristics:

Direct Substitutes (Identical Electrical Performance): Parts maintaining the same dropout voltage specification of 0.33V @ 80mA and PSRR of 45dB (1kHz), with matching quiescent current and supply current specifications.

Parametric Equivalents (Enhanced Performance): Parts with improved dropout voltage of 0.22V @ 50mA and enhanced PSRR of 63dB (1kHz), offering superior performance while maintaining functional compatibility within the same package and output specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Dropout Voltage (Max)	Quiescent Current	PSRR	Supply Current (Max)	Package	RoHS Status
LP2982IM5-3.3	Texas Instruments	Obsolete	3.3V	50mA	0.33V @ 80mA	95 µA	45dB (1kHz)	1.4 mA	SOT-23-5	Non-compliant
LP2982IM5-3.3/NOPB	Texas Instruments	Active	3.3V	50mA	0.33V @ 80mA	95 µA	45dB (1kHz)	1.4 mA	SOT-23-5	ROHS3 Compliant
LP2982AIM5-3.3/NOPB	Texas Instruments	Active	3.3V	50mA	0.33V @ 80mA	95 µA	45dB (1kHz)	1.4 mA	SOT-23-5	ROHS3 Compliant
LP2982AIM5X-3.3/NOPB	National Semiconductor	Active	3.3V	50mA	0.33V @ 80mA	95 µA	45dB (1kHz)	1.4 mA	SOT-23-5	Not specified
LP2982IM5X-3.3/NOPB	National Semiconductor	Active	3.3V	50mA	0.33V @ 80mA	95 µA	45dB (1kHz)	1.4 mA	SOT-23-5	Not specified
LP2980AIM5-3.3	Texas Instruments	Last Time Buy	3.3V	50mA	0.22V @ 50mA	95 µA	63dB (1kHz)	1.2 mA	SOT-23-5	ROHS3 Compliant
LP2980AIM5-3.3/NOPB	Texas Instruments	Active	3.3V	50mA	0.22V @ 50mA	95 µA	63dB (1kHz)	1.2 mA	SOT-23-5	ROHS3 Compliant
LP2980AIM5X-3.3/NOPB	Texas Instruments	Active	3.3V	50mA	0.22V @ 50mA	95 µA	63dB (1kHz)	1.2 mA	SOT-23-5	ROHS3 Compliant
LP2980IM5-3.3	Texas Instruments	Last Time Buy	3.3V	50mA	0.22V @ 50mA	95 µA	63dB (1kHz)	1.2 mA	SOT-23-5	ROHS3 Compliant
LP2980IM5-3.3/NOPB	Texas Instruments	Active	3.3V	50mA	0.22V @ 50mA	95 µA	63dB (1kHz)	1.2 mA	SOT-23-5	ROHS3 Compliant
LP2980IM5X-3.3/NOPB	Texas Instruments	Active	3.3V	50mA	0.22V @ 50mA	95 µA	63dB (1kHz)	1.2 mA	SOT-23-5	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Characteristics):

LP2982IM5-3.3/NOPB is the primary direct substitute, offering active product status and ROHS3 compliance. This part maintains identical electrical specifications including 0.33V dropout voltage and 45dB PSRR, ensuring drop-in compatibility. LP2982AIM5-3.3/NOPB provides an alternative with active status and full compliance certification.

For Enhanced Performance Applications:

The LP2980 series (LP2980IM5-3.3/NOPB, LP2980AIM5X-3.3/NOPB, LP2980AIM5-3.3/NOPB) offers improved electrical performance with reduced dropout voltage (0.22V @ 50mA) and enhanced PSRR (63dB at 1kHz), along with lower supply current (1.2mA vs 1.4mA). These parts are suitable for applications where improved regulation and lower power consumption provide system benefits. LP2980IM5-3.3/NOPB is recommended as the primary enhanced-performance option due to active product status and highest inventory availability (16,200 units).

Compliance Considerations:

All Texas Instruments parts listed are ROHS3 compliant except the obsolete LP2982IM5-3.3. National Semiconductor variants (LP2982AIM5X-3.3/NOPB, LP2982IM5X-3.3/NOPB) maintain active status but do not specify RoHS compliance status. For new designs requiring regulatory compliance, Texas Instruments ROHS3-compliant variants are recommended.

Frequently Asked Questions (FAQ)

Q: Can LP2980 series parts directly replace LP2982IM5-3.3?

A: Yes. Both series maintain identical 3.3V output, 50mA current capability, and SOT-23-5 package. The LP2980 series offers improved electrical performance (lower dropout voltage and higher PSRR) while remaining functionally compatible. No circuit modifications are required.

Q: What is the difference between LP2982 and LP2980 series?

A: The primary differences are dropout voltage and PSRR specifications. LP2982 operates at 0.33V dropout @ 80mA with 45dB PSRR, while LP2980 operates at 0.22V dropout @ 50mA with 63dB PSRR. Both deliver 50mA output current and 3.3V fixed output. LP2980 provides superior performance characteristics.

Q: Are packaging variants (CT, TR, Bulk) interchangeable?

A: Packaging variants (Cut Tape, Tape & Reel, Bulk) refer to delivery format only. The electrical and mechanical specifications of the die and package remain identical. Selection depends on procurement and assembly requirements, not functional compatibility.

Q: Why is the original LP2982IM5-3.3 marked obsolete?

A: The part is obsolete due to product lifecycle management. Texas Instruments continues to offer functionally equivalent and superior alternatives through the LP2982 and LP2980 series with active product status and current compliance certifications.

Q: Which substitute offers the best long-term availability?

A: LP2980IM5-3.3/NOPB is recommended for long-term designs. It maintains active product status, ROHS3 compliance, and the highest inventory level (16,200 units) among available substitutes, ensuring sustained supply for production requirements.

Q: Do all substitutes include Enable control feature?

A: Yes. All listed substitutes maintain the Enable control feature specified for the original LP2982IM5-3.3, along with identical protection features (over-current, over-temperature, short-circuit).

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