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LM2674MX-3.3
Texas Instruments
IC REG BUCK 3.3V 500MA 8SOIC
5344 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 500mA 8-SOIC (0.154", 3.90mm Width)
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5.0 / 5.0
- (450 Ratings)
LM2674MX-3.3
Product Overview
1330490
DiGi Electronics Part Number
LM2674MX-3.3-DGManufacturer
Texas Instruments
LM2674MX-3.3
Description
IC REG BUCK 3.3V 500MA 8SOICInventory
5344 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 500mA 8-SOIC (0.154", 3.90mm Width)
Quantity
Minimum 1
Minimum 1
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LM2674MX-3.3 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
Product Status
Obsolete
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Fixed
Number of Outputs
1
Voltage - Input (Min)
6.5V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
3.3V
Voltage - Output (Max)
-
Current - Output
500mA
Frequency - Switching
260kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Base Product Number
LM2674
Datasheet & Documents
HTML Datasheet
LM2674MX-3.3-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM2674MX-3.3DKR
LM2674MX-3.3CT
LM2674MX33
LM2674MX-3.3TR
Standard Package
2,500
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Thanks to DiGi Electronics, I enjoy top-tier products without breaking the bank.
de desembre 02, 2025
The reliability of their products ensures consistent performance that I can count on.
de desembre 02, 2025
DiGi Electronics maintains a high standard of post-purchase support.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LM2674MX-3.3 in a new power supply design given its obsolete status?
Using the LM2674MX-3.3 in new designs carries significant supply chain risks due to its obsolete status from Texas Instruments. While 5,300 units are available now, long-term availability isn't guaranteed, which can disrupt production and increase obsolescence management costs. We recommend evaluating pin- and function-compatible alternatives like the LM2674MX-3.3/NOPB (RoHS-compliant, active status) or the LM2678-3.3 for higher current needs. Always secure last-time buys and confirm lifecycle status with TI before committing to high-volume designs with the LM2674MX-3.3.
How do I ensure thermal reliability of the LM2674MX-3.3 in a high-temperature industrial environment?
The LM2674MX-3.3 supports up to 125°C junction temperature, but thermal performance depends heavily on PCB layout and copper area. In high-ambient environments (>85°C), verify thermal resistance of your 8-SOIC footprint and ensure ≥1 square inch of copper pour on the GND and VIN nets. Use a thermal relief design for solderability, and consider adding a small heatsink or forced airflow if dropout or load transients cause sustained high duty cycles. Monitor TJ under worst-case load and input conditions to avoid thermal shutdown or accelerated aging.
Can the LM2674MX-3.3 replace the LM2574-3.3 in an existing buck converter design without major changes?
While the LM2674MX-3.3 and LM2574-3.3 are both step-down regulators with similar pinouts and 3.3V fixed output, direct replacement requires caution. The LM2674 switches at 260kHz vs. 52kHz on the LM2574, necessitating reevaluation of output LC filter components to avoid resonance and excessive ripple. Also, the LM2674 offers improved efficiency and tighter regulation but lacks cycle-by-cycle current limiting. Update the catch diode, input capacitor, and feedback loop stability components to match the higher switching frequency and confirm transient response meets your system requirements.
What layout practices are critical to minimize EMI when integrating the LM2674MX-3.3 in sensitive analog systems?
The 260kHz switching frequency of the LM2674MX-3.3 can couple noise into sensitive analog circuits if layout is suboptimal. To minimize EMI: keep the VIN-to-input-capacitor loop area as small as possible using low-ESR ceramics; place the catch diode and inductor close to the IC; avoid routing high-speed switching nodes under or near analog traces; use a solid ground plane beneath the device; and consider adding a small RC snubber (e.g., 10Ω + 100pF) across the catch diode if ringing is observed. Shielding and proper input filtering may be needed in mixed-signal environments.
What are the reliability implications of using the RoHS non-compliant LM2674MX-3.3 in new international designs?
The LM2674MX-3.3 is marked as RoHS non-compliant, meaning it contains lead or other restricted substances above permitted levels. This limits its use in consumer, medical, or industrial equipment targeting EU, UK, or Chinese markets due to regulatory non-compliance. Even if functionally suitable, using this variant risks export restrictions, compliance failures, and brand liability. Consider the drop-in replacement LM2674MX-3.3/NOPB, which is identical but RoHS-compliant and lead-free. Always verify material content via TI's website for export-controlled or environmentally regulated applications.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM2674MX-3.3 CAD Models
Texas Instruments LM2674MX-3.3 PCB symbols & footprints
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