LP2980IM5-3.3 Equivalent & Substitute Parts

Part Overview

The LP2980IM5-3.3 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 Last Time Buy, indicating discontinued production with limited inventory availability. The part provides positive fixed output configuration with integrated enable control and comprehensive protection features including over-current, over-temperature, and short-circuit protection. Due to its Last Time Buy status, identifying equivalent and substitute parts is essential for design continuity and long-term supply chain planning.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	50mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.22V @ 50mA
Quiescent Current	95 µA
PSRR	63dB (1kHz)
Operating Temperature Range	-40°C to 125°C
Package	SOT-23-5 (SC-74A)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2980IM5-3.3 are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents (Identical Electrical Performance): Parts that maintain all critical electrical parameters including 0.22V maximum dropout voltage at 50mA, 63dB PSRR at 1kHz, and 95 µA quiescent current. These parts are pin-compatible and functionally interchangeable without circuit modification. This group includes LP2980IM5-3.3/NOPB, LP2980AIM5-3.3, LP2980AIM5-3.3/NOPB, LP2980AIM5X-3.3/NOPB, and LP2980IM5X-3.3/NOPB.

Parametric Equivalents (Modified Electrical Characteristics): Parts that maintain the same output voltage (3.3V), output current (50mA), package (SOT-23-5), and operating temperature range, but with relaxed dropout voltage specifications (0.33V @ 80mA) and reduced PSRR (45dB at 1kHz). These parts are suitable for applications where the tighter electrical specifications of the original part are not required. This group includes LP2982AIM5-3.3/NOPB, LP2982AIM5X-3.3/NOPB, LP2982IM5-3.3/NOPB, and LP2982IM5X-3.3/NOPB.

Cross-Manufacturer Equivalent (STMicroelectronics): The LD2980ABM33TR from STMicroelectronics provides functional equivalence with minor parameter variations in quiescent current (150 µA vs. 95 µA) and dropout voltage specification method (0.225V @ 50mA). This part maintains identical package, output voltage, and output current specifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage (Max)	Quiescent Current	PSRR (1kHz)	Package	Product Status	Inventory (Pcs)
LP2980IM5-3.3	Texas Instruments	3.3V	50mA	0.22V @ 50mA	95 µA	63dB	SOT-23-5	Last Time Buy	10,300
LP2980IM5-3.3/NOPB	Texas Instruments	3.3V	50mA	0.22V @ 50mA	95 µA	63dB	SOT-23-5	Active	16,200
LP2980AIM5-3.3	Texas Instruments	3.3V	50mA	0.22V @ 50mA	95 µA	63dB	SOT-23-5	Last Time Buy	3,300
LP2980AIM5-3.3/NOPB	Texas Instruments	3.3V	50mA	0.22V @ 50mA	95 µA	63dB	SOT-23-5	Active	4,152
LP2980AIM5X-3.3/NOPB	Texas Instruments	3.3V	50mA	0.22V @ 50mA	95 µA	63dB	SOT-23-5	Active	1,352
LP2980IM5X-3.3/NOPB	Texas Instruments	3.3V	50mA	0.22V @ 50mA	95 µA	63dB	SOT-23-5	Active	19,789
LP2982AIM5-3.3/NOPB	Texas Instruments	3.3V	50mA	0.33V @ 80mA	95 µA	45dB	SOT-23-5	Active	1,599
LP2982AIM5X-3.3/NOPB	National Semiconductor	3.3V	50mA	0.33V @ 80mA	95 µA	45dB	SOT-23-5	Active	8,100
LP2982IM5-3.3/NOPB	Texas Instruments	3.3V	50mA	0.33V @ 80mA	95 µA	45dB	SOT-23-5	Active	4,501
LP2982IM5X-3.3/NOPB	National Semiconductor	3.3V	50mA	0.33V @ 80mA	95 µA	45dB	SOT-23-5	Active	9,800
LD2980ABM33TR	STMicroelectronics	3.3V	50mA	0.225V @ 50mA	150 µA	63dB	SOT-23-5	Active	29,400

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LP2980IM5-3.3/NOPB is the primary recommendation as an Active product with the highest inventory (16,200 units) among direct equivalents. This part maintains all electrical parameters of the original LP2980IM5-3.3 while offering superior supply availability and active product status. LP2980IM5X-3.3/NOPB provides the largest inventory (19,789 units) with identical electrical performance and Active status, making it suitable for high-volume applications.

For Applications with Relaxed Specifications: LP2982 series parts (LP2982AIM5-3.3/NOPB, LP2982IM5-3.3/NOPB) are suitable when the application can tolerate increased dropout voltage (0.33V @ 80mA) and reduced PSRR (45dB). These parts maintain Active product status with adequate inventory levels.

For Cross-Manufacturer Sourcing: LD2980ABM33TR from STMicroelectronics offers the highest inventory availability (29,400 units) with Active product status. The slightly elevated quiescent current (150 µA vs. 95 µA) and marginally improved dropout voltage specification (0.225V) make this part suitable for applications where supply chain diversification is prioritized.

Compliance Considerations: All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the original LP2980IM5-3.3. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Frequently Asked Questions (FAQ)

Q: Can LP2980AIM5-3.3/NOPB be used as a direct replacement for LP2980IM5-3.3? A: Yes. Both parts maintain identical electrical specifications including 3.3V output, 50mA output current, 0.22V maximum dropout voltage at 50mA, 63dB PSRR at 1kHz, and SOT-23-5 package. The primary difference is product status (Active vs. Last Time Buy) and inventory levels.

Q: What is the difference between LP2980 and LP2982 series parts? A: The LP2982 series has relaxed electrical specifications with 0.33V maximum dropout voltage at 80mA (vs. 0.22V at 50mA for LP2980) and reduced PSRR of 45dB at 1kHz (vs. 63dB for LP2980). Both maintain identical output voltage, output current, package, and operating temperature range. LP2982 is suitable for applications where tighter specifications are not required.

Q: Are parts with "/NOPB" suffix compatible with parts without this suffix? A: Yes. The "/NOPB" designation indicates "No Plumbum" (lead-free) packaging and does not affect electrical compatibility. Parts with and without this suffix are functionally interchangeable.

Q: Can LD2980ABM33TR from STMicroelectronics replace the Texas Instruments LP2980IM5-3.3? A: Yes, with minor parameter variations. The LD2980ABM33TR maintains identical output voltage (3.3V), output current (50mA), package (SOT-23-5), and operating temperature range. The quiescent current is 150 µA (vs. 95 µA) and dropout voltage is specified as 0.225V @ 50mA (vs. 0.22V). These differences are negligible for most applications.

Q: What is the significance of the "X" designation in part numbers like LP2980AIM5X-3.3/NOPB? A: The "X" designation indicates extended temperature range or alternative manufacturing process. Electrically, parts with and without the "X" designation maintain identical specifications and are interchangeable.

Q: Which substitute part offers the best supply availability? A: LD2980ABM33TR from STMicroelectronics has the highest inventory at 29,400 units. Among Texas Instruments parts, LP2980IM5X-3.3/NOPB offers the largest inventory at 19,789 units.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the original LP2980IM5-3.3.

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