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LM3674MF-ADJ Buck Switching Regulator IC
Part Overview
The LM3674MF-ADJ is a buck switching regulator IC manufactured by Texas Instruments, designed for positive adjustable output voltage regulation in compact surface-mount applications. This device delivers 600mA output current with an adjustable output range from 1V to 3.3V, operating from a 2.7V to 5.5V input supply. The LM3674MF-ADJ is classified as Last Time Buy, indicating discontinued production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM3674MF-ADJ |
| Category | Power Management (PMIC) |
| Function | Step-Down (Buck) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 2.7V |
| Voltage - Input (Max) | 5.5V |
| Voltage - Output (Min/Fixed) | 1V |
| Voltage - Output (Max) | 3.3V |
| Current - Output | 600mA |
| Frequency - Switching | 2MHz |
| Synchronous Rectifier | Yes |
| Operating Temperature | -30°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution of the LM3674MF-ADJ is determined by strict equivalence across the following critical parameters:
Electrical Specifications: Input voltage range (2.7V to 5.5V), adjustable output voltage range (1V to 3.3V), output current capability (600mA), switching frequency (2MHz), and synchronous rectifier functionality must remain identical.
Mechanical Compatibility: Package type (SC-74A, SOT-753) and mounting configuration (Surface Mount, SOT-23-5) must match exactly to ensure PCB layout compatibility without redesign.
Regulatory Compliance: RoHS3 compliance, REACH unaffected status, and moisture sensitivity level (MSL 1) must be maintained.
Product Status Consideration: The LM3674MF-ADJ is Last Time Buy. The manufacturer-recommended substitute LM3674MF-ADJ/NOPB carries identical electrical and mechanical specifications but maintains Active product status, ensuring long-term availability.
Parameter Comparison
| Parameter | LM3674MF-ADJ | LM3674MF-ADJ/NOPB |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Product Status | Last Time Buy | Active |
| Function | Step-Down | Step-Down |
| Output Configuration | Positive | Positive |
| Output Type | Adjustable | Adjustable |
| Number of Outputs | 1 | 1 |
| Voltage - Input (Min) | 2.7V | 2.7V |
| Voltage - Input (Max) | 5.5V | 5.5V |
| Voltage - Output (Min/Fixed) | 1V | 1V |
| Voltage - Output (Max) | 3.3V | 3.3V |
| Current - Output | 600mA | 600mA |
| Frequency - Switching | 2MHz | 2MHz |
| Synchronous Rectifier | Yes | Yes |
| Operating Temperature | -30°C ~ 85°C (TA) | -30°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | SC-74A, SOT-753 | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 | SOT-23-5 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
The LM3674MF-ADJ/NOPB is the direct manufacturer-recommended substitute for the LM3674MF-ADJ. Both parts are manufactured by Texas Instruments and share identical electrical specifications, mechanical packaging, and regulatory compliance certifications. The primary distinction is product status: the original LM3674MF-ADJ is Last Time Buy, while the LM3674MF-ADJ/NOPB maintains Active status with significantly higher inventory availability (17,597 units versus 1,440 units). For new designs or production continuity, the LM3674MF-ADJ/NOPB is the appropriate selection. For existing designs currently using LM3674MF-ADJ, direct substitution with LM3674MF-ADJ/NOPB requires no circuit modifications, PCB layout changes, or firmware adjustments.
Frequently Asked Questions (FAQ)
Q: What is the difference between LM3674MF-ADJ and LM3674MF-ADJ/NOPB?
A: Both parts are electrically and mechanically identical. The "/NOPB" suffix indicates lead-free plating without lead (NOPB). The LM3674MF-ADJ is Last Time Buy status, while LM3674MF-ADJ/NOPB is Active. Substitution is direct with no design changes required.
Q: Can I use LM3674MF-ADJ/NOPB as a drop-in replacement for LM3674MF-ADJ?
A: Yes. The LM3674MF-ADJ/NOPB is a direct substitute. Identical package (SOT-23-5), pinout, electrical performance, and operating specifications ensure compatibility without PCB redesign or circuit modification.
Q: Are there any compliance or certification differences?
A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 rating. Regulatory certifications are equivalent.
Q: What output voltage range does this regulator support?
A: The LM3674MF-ADJ and LM3674MF-ADJ/NOPB support adjustable output voltage from 1V to 3.3V, with input supply range of 2.7V to 5.5V.
Q: What is the maximum output current?
A: Both parts deliver 600mA maximum output current at the specified switching frequency of 2MHz.
Q: Is the synchronous rectifier integrated?
A: Yes. Both the LM3674MF-ADJ and LM3674MF-ADJ/NOPB include integrated synchronous rectifier functionality for improved efficiency.
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