LP2982IM5X-3.3 Equivalent & Substitute Parts

Part Overview

The LP2982IM5X-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 50mA in a SOT-23-5 surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The LP2982 series provides micropower regulation with integrated protection features including over-current, over-temperature, and short-circuit protection, making it suitable for low-power applications requiring stable 3.3V rails.

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 LP2982IM5X-3.3 is determined by strict equivalence across the following critical parameters:

Output voltage: 3.3V fixed
Output current capability: 50mA
Input voltage rating: 16V maximum
Package type: SOT-23-5 surface mount
Operating temperature range: -40°C to 125°C
Control and protection feature set: Enable control with over-current, over-temperature, and short-circuit protection

Substitute parts are grouped into two categories based on electrical performance characteristics:

Category A (LP2980 Series): Parts with improved dropout voltage (0.22V @ 50mA) and higher PSRR (63dB @ 1kHz), offering superior performance while maintaining full parameter compatibility.

Category B (LP2982 Series): Parts with identical electrical specifications to the main part (0.33V @ 80mA dropout, 45dB PSRR), providing direct functional equivalence.

Parameter Comparison

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

Engineering Selection Recommendations

For designs currently using the obsolete LP2982IM5X-3.3, the following selection criteria apply:

Primary Recommendation - Active Status with RoHS3 Compliance: LP2980IM5-3.3/NOPB, LP2980IM5X-3.3/NOPB, LP2980AIM5-3.3/NOPB, and LP2980AIM5X-3.3/NOPB are all active products with ROHS3 compliance. These parts offer improved electrical performance with lower dropout voltage (0.22V @ 50mA versus 0.33V @ 80mA) and higher PSRR (63dB versus 45dB), while maintaining full functional compatibility. The /NOPB suffix indicates lead-free plating.

Secondary Recommendation - Direct Electrical Equivalence: LP2982AIM5-3.3/NOPB and LP2982IM5-3.3/NOPB maintain identical electrical specifications to the original part with active product status and ROHS3 compliance, providing direct substitution without performance changes.

Compliance Consideration: The original LP2982IM5X-3.3 is RoHS non-compliant. All recommended substitutes are either ROHS3 compliant or have unspecified compliance status. For applications requiring RoHS compliance, select from the ROHS3 compliant variants.

Packaging Note: All substitute parts maintain the SOT-23-5 package specification, ensuring mechanical and thermal compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can LP2980 series parts directly replace LP2982IM5X-3.3?

A: Yes. The LP2980 series maintains identical output voltage (3.3V), output current (50mA), input voltage rating (16V), package (SOT-23-5), operating temperature range (-40°C to 125°C), and protection features. The LP2980 variants offer improved performance with lower dropout voltage and higher PSRR while remaining fully compatible.

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

A: Both series provide 3.3V, 50mA regulation in SOT-23-5 packages. The LP2980 series features lower dropout voltage (0.22V @ 50mA) and higher PSRR (63dB @ 1kHz), while the LP2982 series has higher dropout voltage (0.33V @ 80mA) and lower PSRR (45dB @ 1kHz). Both are functionally equivalent for the specified output parameters.

Q: What does the /NOPB suffix indicate?

A: The /NOPB suffix indicates lead-free plating and RoHS compliance. Parts without this suffix may use lead-based plating and may not meet RoHS requirements.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use the SOT-23-5 package (SC-74A). Packaging variants listed (Cut Tape, Tape & Reel, Bulk) refer to supply format only and do not affect component form factor or PCB compatibility.

Q: Which substitute part has the best availability?

A: LP2980IM5X-3.3/NOPB shows the highest inventory at 19,789 pieces, followed by LP2980IM5-3.3/NOPB at 16,200 pieces. Both are active products with ROHS3 compliance.

Q: Can I use National Semiconductor LP2982AIM5X-3.3/NOPB or LP2982IM5X-3.3/NOPB?

A: Yes, these parts maintain identical electrical specifications to the original LP2982IM5X-3.3. However, they are sourced from National Semiconductor rather than Texas Instruments. Verify supply chain and support requirements before selection.

Q: What is the impact of improved dropout voltage in LP2980 variants?

A: Lower dropout voltage (0.22V @ 50mA in LP2980 versus 0.33V @ 80mA in LP2982) allows the regulator to maintain output voltage regulation with lower input voltage headroom, improving efficiency in battery-powered or low-input-voltage applications.

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