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LP3872EMP-1.8 Equivalent & Substitute Parts
Part Overview
The LP3872EMP-1.8 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 1.8V output at 1.5A in a SOT-223-5 surface mount package. This device is classified as Obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The regulator features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LP3872EMP-1.8 |
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Output Voltage (Fixed) | 1.8V |
| Output Current | 1.5A |
| Input Voltage (Max) | 7V |
| Voltage Dropout (Max) | 0.55V @ 1.5A |
| Quiescent Current (Iq) | 5 mA |
| Supply Current (Max) | 15 mA |
| PSRR | 73dB ~ 57dB (120Hz) |
| Package / Case | SOT-223-5 |
| Operating Temperature Range | -40°C ~ 125°C |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Control Features | Enable |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the LP3872EMP-1.8 is determined by the following critical parameters:
- Fixed output voltage of 1.8V
- Output current capability of 1.5A
- Maximum input voltage of 7V
- Voltage dropout specification
- Quiescent and supply current characteristics
- SOT-223-5 package compatibility
- Operating temperature range of -40°C to 125°C
- Presence of enable control and integrated protection features
Substitute parts are grouped into two categories based on electrical performance:
Category A (Lower Dropout, Lower Quiescent Current): LP3852EMP-1.8, LP3852EMP-1.8/NOPB, LP3852EMPX-1.8/NOPB, LP3855EMP-1.8, LP3855EMP-1.8/NOPB. These devices feature 0.43V dropout at 1.5A and 3 mA quiescent current, providing improved efficiency characteristics compared to the main part.
Category B (Matched Dropout and Quiescent Current): LP3872EMP-1.8/NOPB, LP3875EMP-1.8/NOPB, LP3965EMP-1.8/NOPB, LP3962EMP-1.8/NOPB. These devices maintain 0.55V dropout at 1.5A and higher quiescent current (5-9 mA), matching or closely approximating the electrical performance of the LP3872EMP-1.8.
Parameter Comparison
| Part Number | Manufacturer | Output Voltage | Output Current | Dropout @ 1.5A | Iq (mA) | Supply Current (Max) | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| LP3872EMP-1.8 | Texas Instruments | 1.8V | 1.5A | 0.55V | 5 | 15 mA | SOT-223-5 | Obsolete | Non-compliant |
| LP3852EMP-1.8 | Texas Instruments | 1.8V | 1.5A | 0.43V | 3 | 10 mA | SOT-223-5 | Last Time Buy | ROHS3 Compliant |
| LP3852EMP-1.8/NOPB | Texas Instruments | 1.8V | 1.5A | 0.43V | 3 | 10 mA | SOT-223-5 | Active | ROHS3 Compliant |
| LP3852EMPX-1.8/NOPB | Texas Instruments | 1.8V | 1.5A | 0.43V | 3 | 10 mA | SOT-223-5 | Active | ROHS3 Compliant |
| LP3855EMP-1.8 | Texas Instruments | 1.8V | 1.5A | 0.43V | 3 | 10 mA | SOT-223-5 | Obsolete | Non-compliant |
| LP3855EMP-1.8/NOPB | Texas Instruments | 1.8V | 1.5A | 0.43V | 3 | 10 mA | SOT-223-5 | Active | ROHS3 Compliant |
| LP3872EMP-1.8/NOPB | Texas Instruments | 1.8V | 1.5A | 0.55V | 5 | 15 mA | SOT-223-5 | Active | ROHS3 Compliant |
| LP3875EMP-1.8/NOPB | Texas Instruments | 1.8V | 1.5A | 0.55V | 5 | 15 mA | SOT-223-5 | Active | ROHS3 Compliant |
| LP3962EMP-1.8/NOPB | National Semiconductor | 1.8V | 1.5A | 0.55V | 9 | 15 mA | SOT-223 | Active | Not specified |
| LP3965EMP-1.8/NOPB | Texas Instruments | 1.8V | 1.5A | 0.55V | 9 | 15 mA | SOT-223-5 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For applications requiring direct replacement of the obsolete LP3872EMP-1.8, the following selection criteria apply:
Primary Recommendation: LP3872EMP-1.8/NOPB is the direct active equivalent, maintaining identical electrical characteristics (0.55V dropout, 5 mA quiescent current) while offering ROHS3 compliance and Active product status. This part is suitable for new designs and production continuity.
Alternative with Improved Efficiency: LP3852EMP-1.8/NOPB or LP3852EMPX-1.8/NOPB provide superior performance with reduced dropout voltage (0.43V) and lower quiescent current (3 mA), resulting in decreased power dissipation. These parts are Active and ROHS3 compliant. Selection of these alternatives requires verification that the lower dropout specification does not conflict with existing circuit design margins.
Secondary Alternatives: LP3875EMP-1.8/NOPB and LP3965EMP-1.8/NOPB maintain electrical performance matching the LP3872EMP-1.8 while offering Active status and ROHS3 compliance. LP3855EMP-1.8/NOPB provides improved efficiency characteristics and is Active with ROHS3 compliance.
Cross-Manufacturer Option: LP3962EMP-1.8/NOPB from National Semiconductor provides functional equivalence with matching dropout and supply current specifications. RoHS compliance status for this part is not specified in available documentation.
Frequently Asked Questions (FAQ)
Q: Can LP3852EMP-1.8/NOPB be used as a direct drop-in replacement for LP3872EMP-1.8?
A: LP3852EMP-1.8/NOPB is electrically compatible and pin-compatible in the SOT-223-5 package. However, it features lower dropout voltage (0.43V vs. 0.55V) and lower quiescent current (3 mA vs. 5 mA). Designs with tight input voltage margins or specific current consumption budgets must be re-evaluated to confirm compatibility with these improved specifications.
Q: What is the difference between LP3852EMP-1.8 and LP3852EMP-1.8/NOPB?
A: Both parts are electrically identical with matching electrical specifications. The /NOPB designation indicates lead-free, halogen-free packaging compliant with RoHS3 requirements. LP3852EMP-1.8/NOPB is Active, while LP3852EMP-1.8 is Last Time Buy status.
Q: Are all substitute parts available in SOT-223-5 packaging?
A: All substitute parts except LP3962EMP-1.8/NOPB are specified in SOT-223-5 packaging. LP3962EMP-1.8/NOPB uses SOT-223 packaging, which maintains pin compatibility but may have minor dimensional variations. Verify PCB footprint compatibility before selection.
Q: Which substitute part offers the best power efficiency?
A: LP3852EMP-1.8/NOPB, LP3852EMPX-1.8/NOPB, LP3855EMP-1.8, and LP3855EMP-1.8/NOPB offer the lowest dropout voltage (0.43V) and quiescent current (3 mA), resulting in reduced power dissipation compared to the LP3872EMP-1.8.
Q: Is RoHS compliance a requirement for substitute selection?
A: RoHS compliance depends on application and regulatory requirements. LP3872EMP-1.8/NOPB, LP3852EMP-1.8/NOPB, LP3852EMPX-1.8/NOPB, LP3855EMP-1.8/NOPB, LP3875EMP-1.8/NOPB, and LP3965EMP-1.8/NOPB are ROHS3 compliant. The original LP3872EMP-1.8 is RoHS non-compliant.
Q: Can LP3965EMP-1.8/NOPB be used in place of LP3872EMP-1.8?
A: Yes. LP3965EMP-1.8/NOPB provides matching electrical performance with 0.55V dropout and 9 mA quiescent current, SOT-223-5 packaging, and Active product status with ROHS3 compliance. It is a suitable substitute for the obsolete LP3872EMP-1.8.
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