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LP3876ES-ADJ Linear Voltage Regulator
Part Overview
The LP3876ES-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 3A output current in a surface-mount TO-263 (DDPAK-5) package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LP3876ES-ADJ |
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Description | IC REG LIN POS ADJ 3A DDPAK |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 7V |
| Voltage - Output (Min/Fixed) | 1.2V |
| Voltage - Output (Max) | 5.8V |
| Voltage Dropout (Max) | 1.2V @ 3A |
| Current - Output | 3A |
| Current - Quiescent (Iq) | 5 mA |
| Current - Supply (Max) | 15 mA |
| Control Features | Enable |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C |
| Mounting Type | Surface Mount |
| Package / Case | TO-263-6, D2PAK (5 Leads + Tab), TO-263BA |
| Supplier Device Package | TO-263 (DDPAK-5) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the LP3876ES-ADJ is determined by strict equivalence across the following critical parameters:
- Output configuration (Positive)
- Output type (Adjustable)
- Number of regulators (1)
- Maximum input voltage (7V)
- Output voltage range (1.2V to 5.8V)
- Output current capability (3A)
- Voltage dropout specification (1.2V @ 3A)
- Quiescent current (5 mA)
- Protection features (Over Current, Over Temperature, Short Circuit)
- Operating temperature range (-40°C ~ 125°C)
- Package type (TO-263 DDPAK-5)
The LP3876ES-ADJ/NOPB from National Semiconductor meets all these criteria and qualifies as a direct substitute.
Parameter Comparison
| Parameter | LP3876ES-ADJ (Main) | LP3876ES-ADJ/NOPB (Substitute) |
|---|---|---|
| Manufacturer | Texas Instruments | National Semiconductor |
| Product Status | Obsolete | Active |
| Output Configuration | Positive | Positive |
| Output Type | Adjustable | Adjustable |
| Voltage - Input (Max) | 7V | 7V |
| Voltage - Output (Min/Fixed) | 1.2V | 1.2V |
| Voltage - Output (Max) | 5.8V | 5.8V |
| Voltage Dropout (Max) | 1.2V @ 3A | 1.2V @ 3A |
| Current - Output | 3A | 3A |
| Current - Quiescent (Iq) | 5 mA | 5 mA |
| Current - Supply (Max) | 15 mA | 15 mA |
| Control Features | Enable | Enable |
| Protection Features | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Package / Case | TO-263-6, D2PAK (5 Leads + Tab), TO-263BA | TO-263-6, D2PAK (5 Leads + Tab), TO-263BA |
| Supplier Device Package | TO-263 (DDPAK-5) | TO-263 (DDPAK-5) |
Engineering Selection Recommendations
The LP3876ES-ADJ/NOPB is the appropriate substitute for the obsolete LP3876ES-ADJ. The substitute part maintains active product status with National Semiconductor, ensuring continued availability and supply chain reliability. Both parts are RoHS non-compliant and carry identical electrical and mechanical specifications across all critical parameters. The TO-263 DDPAK-5 package is identical, permitting direct PCB layout compatibility without redesign. Selection of the active substitute part eliminates obsolescence risk while preserving full functional equivalence in the application circuit.
Frequently Asked Questions (FAQ)
Q: Can the LP3876ES-ADJ/NOPB be used as a direct replacement for the LP3876ES-ADJ?
A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including output voltage range, current capability, dropout voltage, protection features, and package configuration. Direct substitution is supported without circuit modification.
Q: What is the significance of the "/NOPB" suffix in the substitute part number?
A: The "/NOPB" designation indicates the part is supplied without lead-free plating. This is a packaging and supply designation that does not affect electrical performance or functional compatibility.
Q: Are there any compliance differences between the main part and substitute?
A: Both parts carry identical RoHS non-compliant status and REACH unaffected classification. No compliance advantage exists between the two parts.
Q: Why is the main part listed as obsolete?
A: The LP3876ES-ADJ from Texas Instruments has reached end-of-life status. The substitute part from National Semiconductor remains in active production, providing continued design support and component availability.
Q: Is the TO-263 DDPAK-5 package footprint identical between both parts?
A: Yes. Both parts use the identical TO-263-6 D2PAK (5 Leads + Tab) package configuration, ensuring PCB layout compatibility without modification.
Q: What protection features are included in both parts?
A: Both the LP3876ES-ADJ and LP3876ES-ADJ/NOPB include integrated over-current, over-temperature, and short-circuit protection.
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