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LP2981IM5X-5.0 Equivalent & Substitute Parts
Part Overview
The LP2981IM5X-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 5V positive output at 100mA with a maximum dropout voltage of 0.37V at full load current. The part is packaged in SOT-23-5 (SC-74A) surface mount configuration and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.
The LP2981IM5X-5.0 carries a Last Time Buy product status, indicating limited availability. Identifying equivalent and substitute parts ensures design continuity and supply chain flexibility for applications requiring this voltage regulation topology.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Output Voltage (Fixed) | 5V |
| Output Current | 100mA |
| Input Voltage (Max) | 16V |
| Dropout Voltage (Max) | 0.37V @ 100mA |
| Quiescent Current | 95 µA |
| PSRR | 63dB (1kHz) |
| Operating Temperature Range | -40°C to 125°C |
| Package | SOT-23-5 (SC-74A) |
| Control Features | Enable |
| Protection Features | Over Current, Over Temperature, Short Circuit |
Substitute Part Grouping Explanation
Substitution eligibility for the LP2981IM5X-5.0 is determined by strict equivalence across the following parameters:
- Output voltage: 5V fixed
- Output current capability: 100mA
- Maximum input voltage: 16V
- Dropout voltage: 0.37V @ 100mA
- Quiescent current: 95 µA
- PSRR: 63dB (1kHz)
- Operating temperature range: -40°C to 125°C
- Package type: SOT-23-5 (SC-74A)
- Control and protection features: Enable, Over Current, Over Temperature, Short Circuit
All identified substitute parts maintain identical electrical specifications and package configuration. Differences exist only in product status, packaging format (Tape & Reel vs. Cut Tape), and manufacturing date codes.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Packaging | Output Voltage | Output Current | Input Voltage (Max) | Dropout Voltage | Quiescent Current | PSRR | Operating Temp | Package Type |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LP2981IM5X-5.0 | Texas Instruments | Last Time Buy | Tape & Reel (TR) | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981IM5X-5.0/NOPB | Texas Instruments | Active | Tape & Reel (TR) | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981-50DBVR | Texas Instruments | Active | Cut Tape (CT) & Digi-Reel® | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981-50DBVT | Texas Instruments | Last Time Buy | Cut Tape (CT) | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981A-50DBVR | Texas Instruments | Active | Cut Tape (CT) & Digi-Reel® | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981A-50DBVT | Texas Instruments | Active | Tape & Reel (TR) | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981AIM5-5.0 | Texas Instruments | Obsolete | Cut Tape (CT) & Digi-Reel® | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981AIM5-5.0/NOPB | Texas Instruments | Active | Cut Tape (CT) & Digi-Reel® | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981AIM5X-5.0/NOPB | Texas Instruments | Active | Cut Tape (CT) & Digi-Reel® | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981IM5-5.0 | National Semiconductor | Active | Not Specified | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
| LP2981IM5-5.0/NOPB | Texas Instruments | Active | Cut Tape (CT) & Digi-Reel® | 5V | 100mA | 16V | 0.37V @ 100mA | 95 µA | 63dB (1kHz) | -40°C to 125°C | SOT-23-5 |
Engineering Selection Recommendations
Primary Recommendation: LP2981IM5X-5.0/NOPB
This part is the direct equivalent to LP2981IM5X-5.0 with identical electrical and mechanical specifications. It carries Active product status, ensuring long-term availability and supply continuity. The /NOPB designation indicates lead-free compliance and RoHS3 certification. Inventory availability is 6,640 units.
Secondary Recommendations (Active Status):
LP2981-50DBVR, LP2981A-50DBVR, LP2981A-50DBVT, LP2981AIM5-5.0/NOPB, and LP2981AIM5X-5.0/NOPB are all Active status alternatives with identical electrical performance. These parts differ only in packaging format (Cut Tape vs. Tape & Reel) and are suitable for high-volume or low-volume procurement scenarios respectively. All carry RoHS3 compliance and REACH Unaffected status.
Alternative Consideration: LP2981IM5-5.0/NOPB
This part maintains full electrical equivalence with 20,520 units in stock. It is available in Cut Tape & Digi-Reel® packaging and carries Active product status with RoHS3 compliance.
Avoid: LP2981AIM5-5.0
This part carries Obsolete product status and should not be selected for new designs despite electrical equivalence.
Frequently Asked Questions (FAQ)
Q: Can LP2981IM5X-5.0/NOPB be used as a direct replacement for LP2981IM5X-5.0?
A: Yes. Both parts are electrically and mechanically identical. The /NOPB designation indicates lead-free manufacturing and RoHS3 compliance. The primary difference is product status: LP2981IM5X-5.0/NOPB is Active, while the original is Last Time Buy.
Q: What is the difference between Cut Tape and Tape & Reel packaging?
A: Both packaging formats contain identical components in SOT-23-5 configuration. Tape & Reel (TR) is optimized for high-volume automated assembly. Cut Tape (CT) and Digi-Reel® are suitable for lower-volume applications or manual handling. Electrical performance is identical.
Q: Are the LP2981A variants compatible with LP2981IM5X-5.0 designs?
A: Yes. The LP2981A series maintains identical output voltage, current rating, dropout voltage, quiescent current, PSRR, operating temperature range, and package type. All protection and control features are equivalent.
Q: What does the /NOPB suffix mean?
A: /NOPB indicates "No Plumbum" (lead-free) manufacturing. These parts comply with RoHS3 regulations and REACH requirements. They are suitable for applications requiring lead-free components.
Q: Can I substitute a National Semiconductor LP2981IM5-5.0 for the Texas Instruments LP2981IM5X-5.0?
A: Electrical specifications are identical. However, the National Semiconductor part has undefined Moisture Sensitivity Level and REACH Affected status. Verify compliance requirements for your application before selection.
Q: Which substitute part has the highest inventory availability?
A: LP2981-50DBVT carries 1,000,300 units in stock. However, it is Last Time Buy status. For long-term supply assurance, select from Active status parts such as LP2981IM5X-5.0/NOPB (6,640 units) or LP2981IM5-5.0/NOPB (20,520 units).
Q: Are all substitute parts RoHS3 compliant?
A: All Texas Instruments parts listed carry RoHS3 Compliant status. The National Semiconductor LP2981IM5-5.0 does not specify RoHS status. Verify compliance documentation for your specific application requirements.
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