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LM2594MX-3.3
Texas Instruments
IC REG BUCK 3.3V 500MA 8SOIC
2527 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
- (520 Ratings)
LM2594MX-3.3
Product Overview
1310853
DiGi Electronics Part Number
LM2594MX-3.3-DGManufacturer
Texas Instruments
LM2594MX-3.3
Description
IC REG BUCK 3.3V 500MA 8SOICInventory
2527 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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LM2594MX-3.3 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
-
Series
SIMPLE SWITCHER®
Product Status
Obsolete
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Fixed
Number of Outputs
1
Voltage - Input (Min)
4.5V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
3.3V
Voltage - Output (Max)
-
Current - Output
500mA
Frequency - Switching
150kHz
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
LM2594
Datasheet & Documents
HTML Datasheet
LM2594MX-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
LM2594MX33
LM2594MX-3.3TR
LM2594MX-3.3CT
LM2594MX-3.3DKR
Standard Package
2,500
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
DiGi Electronicsの迅速な発送としっかりした梱包にいつも感動しています。
de desembre 02, 2025
I appreciate their dedication to reducing packaging waste while keeping prices low.
de desembre 02, 2025
They handle complaints professionally and resolve issues swiftly, demonstrating excellent support.
de desembre 02, 2025
The high-quality materials give me confidence that these products will last a long time.
de desembre 02, 2025
The durability of their products gives me peace of mind, knowing I won’t need frequent replacements.
de desembre 02, 2025
Reliability and friendliness define DiGi Electronics’ approach to customer service.
de desembre 02, 2025
The friendly and expert customer service team makes every purchase smooth.
de desembre 02, 2025
DiGi Electronics responded rapidly when I encountered an issue, guiding me with clear, quick instructions.
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Frequently Asked Questions (FAQ)
Can I use the LM2594MX-3.3 in a new design given that it's listed as obsolete, and what are the risks compared to recommended replacements like LM2594MX-3.3/NOPB?
The LM2594MX-3.3 is marked as obsolete by Texas Instruments, meaning it's no longer recommended for new designs and may face long-term availability issues. While you can still source it (2428 units in stock), using it introduces supply chain risk and potential obsolescence-driven redesign costs. TI recommends the drop-in pin-compatible, RoHS-compliant LM2594MX-3.3/NOPB as a successor. For new designs, transition to the NOPB variant to ensure long-term availability, compliance, and access to updated technical support without altering your PCB layout.
How do thermal considerations impact the reliability of the LM2594MX-3.3 in high-ambient-temperature environments above 85°C?
The LM2594MX-3.3 supports a junction temperature up to 125°C, but in ambient environments above 85°C, thermal management becomes critical due to its non-synchronous buck topology and internal 0.5A switch. Without adequate PCB copper for heatsinking (especially on the exposed pad if available) or proper airflow, the device can overheat, triggering thermal shutdown or accelerated aging. For reliable operation, verify power dissipation under worst-case VIN (e.g., 40V), use thick copper pours on thermal vias, and consider derating output current by 20–30% at high temperatures.
What are the key design-in risks when replacing the LM2594MX-3.3 with the LM2594DADJR2G in an existing layout?
The LM2594DADJR2G is a nearly drop-in alternative to the LM2594MX-3.3 but comes in a WSON package instead of 8-SOIC, requiring a complete PCB redesign due to different footprint and thermal pad requirements. Key risks include insufficient thermal relief, underestimating assembly capability for the smaller package, and mismatched copper thermal mass affecting solder reflow. While electrically similar, the package change prevents direct replacement without layout modifications—use the LM2594MX-3.3/NOPB for true pin-to-pin compatibility and drop-in replacement without redesign.
How does the 150kHz switching frequency of the LM2594MX-3.3 affect EMI performance in noise-sensitive analog applications, and what layout practices help mitigate interference?
The fixed 150kHz switching frequency of the LM2594MX-3.3 can couple into sensitive analog circuits (e.g., precision ADCs or amplifiers) if layout practices are inadequate. To minimize EMI, keep the high-current loop formed by the input capacitor, LM2594MX-3.3, and diode as small as possible. Use a solid ground plane, place input bypass capacitors close to VIN and GND pins, and shield sensitive traces. Adding a small ferrite bead and RC snubber across the diode can further reduce high-frequency ringing and conducted noise.
Is the LM2594MX-3.3 suitable for automotive applications with wide input voltage transients up to 40V, and how does its non-synchronous design impact efficiency at light loads?
Yes, the LM2594MX-3.3 is well-suited for automotive environments due to its 4.5V to 40V input range, covering cold-crank and load-dump events, and operating temperature range from -40°C to 125°C. However, its non-synchronous rectifier (uses an external Schottky diode) reduces efficiency at light loads compared to modern synchronous buck converters like the LM2678. Expect ~70–75% efficiency at 10% load. To improve light-load efficiency, select a low forward-voltage Schottky diode (e.g., 1N5819) and minimize trace resistance in the power path.
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.
LM2594MX-3.3 CAD Models
Texas Instruments LM2594MX-3.3 PCB symbols & footprints
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