Request Quote
(Ships tomorrow)
LM3674MFX-ADJ Equivalent & Substitute Parts
Part Overview
The LM3674MFX-ADJ is a buck switching regulator IC from Texas Instruments designed for positive adjustable output voltage regulation. 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 component is housed in a SC-74A (SOT-753) surface mount package.
The LM3674MFX-ADJ is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| 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 |
Substitute Part Grouping Explanation
Substitution of the LM3674MFX-ADJ is determined by strict equivalence across the following critical parameters:
- Topology & Function: Buck (step-down) switching regulator with positive adjustable output
- Electrical Specifications: Input voltage range 2.7V–5.5V, adjustable output 1V–3.3V, 600mA output current, 2MHz switching frequency
- Synchronous Rectifier: Integrated synchronous rectification capability
- Thermal Range: Operating temperature -30°C to 85°C
- Package: SC-74A (SOT-753) surface mount configuration with SOT-23-5 pin assignment
- Manufacturer: Texas Instruments
The LM3674MFX-ADJ/NOPB is a direct manufacturer equivalent that maintains identical electrical and mechanical specifications while differing in product status and packaging format.
Parameter Comparison
| Parameter | LM3674MFX-ADJ | LM3674MFX-ADJ/NOPB |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| 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 |
| Product Status | Obsolete | Active |
| Packaging Format | Bulk | Tape & Reel (TR) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The LM3674MFX-ADJ/NOPB is the direct functional equivalent of the LM3674MFX-ADJ. Both devices share identical electrical performance, thermal characteristics, and physical packaging.
Selection between these parts should be based on:
Product Status: The LM3674MFX-ADJ is obsolete, while the LM3674MFX-ADJ/NOPB maintains active production status. For new designs or ongoing supply requirements, the LM3674MFX-ADJ/NOPB is the appropriate choice.
Regulatory Compliance: The LM3674MFX-ADJ/NOPB is ROHS3 compliant, whereas the original part is RoHS non-compliant. Applications subject to RoHS directives require the compliant variant.
Packaging Format: The LM3674MFX-ADJ/NOPB is supplied in Tape & Reel format, suitable for automated assembly processes. The original part is available in bulk format. Packaging selection depends on production volume and assembly methodology.
Frequently Asked Questions (FAQ)
Q: Can the LM3674MFX-ADJ/NOPB be used as a direct replacement for the LM3674MFX-ADJ?
A: Yes. Both parts are electrically and mechanically identical. The LM3674MFX-ADJ/NOPB is the active production equivalent and is suitable for direct substitution in all applications where the original part was specified.
Q: What is the difference between these two part numbers?
A: The primary differences are product status (obsolete vs. active), packaging format (bulk vs. Tape & Reel), and RoHS compliance status. Electrical performance and package configuration are identical.
Q: Are there any pin compatibility concerns?
A: No. Both parts use the SC-74A (SOT-753) package with SOT-23-5 pin assignment. Pin-to-pin compatibility is complete.
Q: Which part should be selected for new designs?
A: The LM3674MFX-ADJ/NOPB should be selected for new designs. It is in active production and meets current regulatory compliance requirements.
Q: Does the RoHS compliance difference affect electrical performance?
A: No. RoHS compliance relates to material composition and environmental regulations, not electrical or thermal performance. Both parts deliver identical functional characteristics.
Q: What is the significance of the "/NOPB" suffix?
A: The "/NOPB" suffix indicates the part is supplied without plumbum (lead-free). This designation is associated with RoHS3 compliance and Tape & Reel packaging format.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts