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LP38842MR-ADJ Linear Voltage Regulator Equivalent & Substitute Parts
Part Overview
The LP38842MR-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 1.5A output current in an 8-SO PowerPad surface mount package and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for design continuity, production planning, and long-term component sourcing strategies.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Current - Output | 1.5A |
| Voltage - Input (Max) | 5.5V |
| Voltage - Output (Min/Fixed) | 0.56V |
| Voltage - Output (Max) | 1.5V |
| Voltage Dropout (Max) | 0.115V @ 1.5A |
| Package / Case | 8-PowerSOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 125°C |
Substitute Part Grouping Explanation
Substitution eligibility for the LP38842MR-ADJ is determined by strict alignment across the following critical parameters:
- Output configuration (Positive)
- Output type (Adjustable)
- Current rating (1.5A)
- Maximum input voltage (5.5V)
- Output voltage range (0.56V to 1.5V)
- Voltage dropout specification (0.115V @ 1.5A)
- Package type (8-PowerSOIC)
- Mounting method (Surface Mount)
- Operating temperature range (-40°C ~ 125°C)
The LP38842MR-ADJ/NOPB qualifies as a direct substitute because it maintains identical electrical specifications and mechanical packaging while offering improved product status and compliance certifications.
Parameter Comparison
| Parameter | LP38842MR-ADJ | LP38842MR-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) | 5.5V | 5.5V |
| Voltage - Output (Min/Fixed) | 0.56V | 0.56V |
| Voltage - Output (Max) | 1.5V | 1.5V |
| Voltage Dropout (Max) | 0.115V @ 1.5A | 0.115V @ 1.5A |
| Current - Quiescent (Iq) | 30 µA | 30 µA |
| PSRR | 58dB ~ 80dB (120Hz ~ 1kHz) | 58dB ~ 80dB (120Hz ~ 1kHz) |
| 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 | 8-PowerSOIC (0.154", 3.90mm Width) | 8-PowerSOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
The LP38842MR-ADJ/NOPB is the direct substitute for the obsolete LP38842MR-ADJ. Both parts share identical electrical performance and mechanical compatibility. The primary distinction is product status and regulatory compliance: the LP38842MR-ADJ/NOPB is actively manufactured and ROHS3 compliant, whereas the original part is obsolete and RoHS non-compliant. For new designs or production continuity, the LP38842MR-ADJ/NOPB is the appropriate selection. The "/NOPB" suffix indicates lead-free, halogen-free packaging, aligning with modern environmental and regulatory standards.
Frequently Asked Questions (FAQ)
Q: Can LP38842MR-ADJ/NOPB be used as a direct replacement for LP38842MR-ADJ?
A: Yes. Both parts are electrically and mechanically identical. The LP38842MR-ADJ/NOPB is the active production equivalent with improved compliance certifications.
Q: What does the "/NOPB" suffix mean?
A: NOPB indicates "No Plumbum" (lead-free) and represents halogen-free, RoHS3-compliant packaging. This is the modern manufacturing standard.
Q: Are there any package or pinout differences between these parts?
A: No. Both use the 8-PowerSOIC package with identical pinout and mechanical dimensions (0.154" width, 3.90mm).
Q: Why is the original LP38842MR-ADJ marked as obsolete?
A: Obsolescence reflects Texas Instruments' product lifecycle management. The LP38842MR-ADJ/NOPB remains in active production and is the recommended choice for all applications.
Q: What are the key electrical parameters that define substitution compatibility?
A: Output current (1.5A), input voltage rating (5.5V max), adjustable output range (0.56V to 1.5V), dropout voltage (0.115V @ 1.5A), and operating temperature range (-40°C to 125°C) must remain constant across substitute parts.
Q: Is the LP38842MR-ADJ/NOPB suitable for new product designs?
A: Yes. As an active, RoHS3-compliant part, it is the standard choice for new designs requiring a 1.5A adjustable positive linear regulator in 8-SO PowerPad packaging.
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