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LM2671N-ADJ Equivalent & Substitute Parts
Part Overview
The LM2671N-ADJ is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for positive adjustable output voltage regulation. This device delivers 500mA output current with an adjustable output range from 1.21V to 37V, making it suitable for step-down power conversion applications requiring flexible voltage levels.
The LM2671N-ADJ is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesigns where this topology remains appropriate.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Function | Step-Down (Buck) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 6.5V |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min/Fixed) | 1.21V |
| Voltage - Output (Max) | 37V |
| Current - Output | 500mA |
| Frequency - Switching | 260kHz |
| Synchronous Rectifier | No |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Through Hole |
| Package / Case | 8-DIP (0.300", 7.62mm) |
| Supplier Device Package | 8-PDIP |
Substitute Part Grouping Explanation
Substitution of the LM2671N-ADJ is determined by strict equivalence across the following critical parameters:
- Input voltage range: 6.5V to 40V
- Output voltage adjustability: 1.21V to 37V
- Output current capability: 500mA
- Switching frequency: 260kHz
- Topology: Buck (step-down)
- Output configuration: Positive, adjustable, single output
- Package: 8-DIP (0.300", 7.62mm) through-hole
- Operating temperature range: -40°C to 125°C
The LM2671N-ADJ/NOPB is a direct substitute that maintains identical electrical specifications and package configuration. The primary distinction is product status and compliance certification.
Parameter Comparison
| Parameter | LM2671N-ADJ | LM2671N-ADJ/NOPB |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Product Status | Obsolete | Active |
| Function | Step-Down | Step-Down |
| Output Configuration | Positive | Positive |
| Output Type | Adjustable | Adjustable |
| Voltage - Input (Min) | 6.5V | 6.5V |
| Voltage - Input (Max) | 40V | 40V |
| Voltage - Output (Min/Fixed) | 1.21V | 1.21V |
| Voltage - Output (Max) | 37V | 37V |
| Current - Output | 500mA | 500mA |
| Frequency - Switching | 260kHz | 260kHz |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Package / Case | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
The LM2671N-ADJ/NOPB is the direct functional equivalent of the LM2671N-ADJ. Both devices share identical electrical performance specifications and physical packaging. The LM2671N-ADJ/NOPB is preferred for new designs and ongoing production due to its active product status and ROHS3 compliance certification. The original LM2671N-ADJ, classified as obsolete, should be replaced with the LM2671N-ADJ/NOPB to ensure long-term supply chain availability and regulatory compliance.
Frequently Asked Questions (FAQ)
Q: Can the LM2671N-ADJ/NOPB be used as a direct replacement for the LM2671N-ADJ?
A: Yes. Both devices are electrically and mechanically identical. The LM2671N-ADJ/NOPB is the active production variant with improved compliance status.
Q: What is the difference between LM2671N-ADJ and LM2671N-ADJ/NOPB?
A: The primary differences are product status (obsolete vs. active) and RoHS compliance (non-compliant vs. ROHS3 compliant). Electrical specifications and package configuration are identical.
Q: Are there any pin compatibility concerns when substituting these parts?
A: No. Both parts use the 8-DIP (0.300", 7.62mm) package with identical pinout and through-hole mounting configuration.
Q: What output voltage range does this regulator support?
A: The adjustable output voltage range is 1.21V to 37V, determined by external feedback resistor configuration.
Q: Is this device suitable for new designs?
A: The LM2671N-ADJ/NOPB is suitable for new designs. The original LM2671N-ADJ is obsolete and should not be selected for new applications.
Q: What is the maximum input voltage this regulator accepts?
A: The maximum input voltage is 40V. The minimum input voltage is 6.5V.
Q: What is the output current capability?
A: The maximum output current is 500mA at the regulated output voltage.
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