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LP3855ES-ADJ Linear Voltage Regulator Equivalent & Substitute Parts
Part Overview
The LP3855ES-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 1.5A output current in a TO-263 (DDPAK-5) package and operates across an input voltage range up to 7V with adjustable output from 1.23V to 6.6V. The part is currently classified as Obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Current - Output | 1.5A |
| Voltage - Input (Max) | 7V |
| Voltage - Output (Min/Fixed) | 1.23V |
| Voltage - Output (Max) | 6.6V |
| Voltage Dropout (Max) | 0.435V @ 1.5A |
| Package / Case | TO-263-6, D2PAK (5 Leads + Tab) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 125°C |
| Protection Features | Over Current, Over Temperature, Short Circuit |
Substitute Part Grouping Explanation
Substitution for the LP3855ES-ADJ is determined by strict equivalence across the following critical parameters:
- Output current capability: 1.5A
- Adjustable output voltage range: 1.23V to 6.6V
- Maximum input voltage: 7V
- Package type: TO-263 (DDPAK-5)
- Surface Mount configuration
- Protection features: Over Current, Over Temperature, Short Circuit
- Operating temperature range: -40°C ~ 125°C
The LP3855ES-ADJ/NOPB qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction between these parts is product status and regulatory compliance.
Parameter Comparison
| Parameter | LP3855ES-ADJ | LP3855ES-ADJ/NOPB |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Product Status | Obsolete | Active |
| Output Configuration | Positive | Positive |
| Output Type | Adjustable | Adjustable |
| Current - Output | 1.5A | 1.5A |
| Voltage - Input (Max) | 7V | 7V |
| Voltage - Output (Min/Fixed) | 1.23V | 1.23V |
| Voltage - Output (Max) | 6.6V | 6.6V |
| Voltage Dropout (Max) | 0.435V @ 1.5A | 0.435V @ 1.5A |
| Package / Case | TO-263-6, D2PAK (5 Leads + Tab) | TO-263-6, D2PAK (5 Leads + Tab) |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Protection Features | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Affected |
Engineering Selection Recommendations
The LP3855ES-ADJ/NOPB is the direct functional equivalent for the obsolete LP3855ES-ADJ. Both parts share identical electrical performance specifications and physical packaging. The LP3855ES-ADJ/NOPB carries Active product status, ensuring continued availability and manufacturer support.
For new designs or production transitions, the LP3855ES-ADJ/NOPB is the appropriate selection. This part meets ROHS3 compliance requirements and is REACH Affected, aligning with current regulatory standards. The obsolete LP3855ES-ADJ should be phased out in favor of the active equivalent to maintain supply chain continuity.
Frequently Asked Questions (FAQ)
Q: Can LP3855ES-ADJ/NOPB be used as a direct replacement for LP3855ES-ADJ?
A: Yes. Both parts are electrically and mechanically identical. They share the same output current (1.5A), adjustable voltage range (1.23V to 6.6V), maximum input voltage (7V), and TO-263 package configuration. The primary difference is product status and regulatory compliance.
Q: What does the "/NOPB" suffix indicate?
A: The "/NOPB" designation indicates the part is supplied in Tube packaging and meets current RoHS3 compliance standards. The base LP3855ES-ADJ without this suffix is classified as Obsolete.
Q: Are there any package differences between these parts?
A: Both parts use the TO-263-6 (D2PAK with 5 Leads + Tab) package for Surface Mount applications. Pin configuration and PCB footprint are identical.
Q: What protection features are included in both parts?
A: Both the LP3855ES-ADJ and LP3855ES-ADJ/NOPB include Over Current, Over Temperature, and Short Circuit protection.
Q: What is the operating temperature range for these regulators?
A: Both parts operate across -40°C to 125°C, suitable for industrial and commercial applications.
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