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LM2596T-3.3
Texas Instruments
IC REG BUCK 3.3V 3A TO220-5
1720 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 3A TO-220-5 Formed Leads
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5.0 / 5.0
- (330 Ratings)
LM2596T-3.3
Product Overview
1368013
DiGi Electronics Part Number
LM2596T-3.3-DGManufacturer
Texas Instruments
LM2596T-3.3
Description
IC REG BUCK 3.3V 3A TO220-5Inventory
1720 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 3A TO-220-5 Formed Leads
Quantity
Minimum 1
Minimum 1
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LM2596T-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
3A
Frequency - Switching
150kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Through Hole
Package / Case
TO-220-5 Formed Leads
Supplier Device Package
TO-220-5
Base Product Number
LM2596
Datasheet & Documents
HTML Datasheet
LM2596T-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
Standard Package
45
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
합리적인 가격과 빠른 고객 대응이 인상적입니다.
de desembre 02, 2025
Une entreprise chaleureuse qui met le client au centre de ses préoccupations.
de desembre 02, 2025
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de desembre 02, 2025
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Frequently Asked Questions (FAQ)
Is the LM2596T-3.3 still a viable choice for new designs given that it's marked as obsolete, and what are the key risks of using an obsolete part in production?
The LM2596T-3.3 is listed as obsolete by Texas Instruments, which means it is no longer recommended for new designs and may face end-of-life supply risks. While existing inventory might still be available, relying on it for volume production introduces significant supply chain uncertainty. Additionally, future design revisions or replacements will require requalification of a new regulator. For new designs, consider transitioning to a supported alternative like the LM2576T-3.3G or LM2596T-3.3/NOPB (if available), which offer similar performance with active manufacturer support and longer lifecycle assurance.
Can I safely replace the LM2596T-3.3 with an LM2576T-3.3G in an existing through-hole PCB layout without major redesign, and what layout or thermal considerations should I evaluate?
Yes, the LM2576T-3.3G is a drop-in compatible replacement for the LM2596T-3.3 in most through-hole applications due to identical TO-220-5 pinout and similar electrical characteristics. However, the LM2576 operates at a lower switching frequency (52 kHz vs. 150 kHz), which may require verification of output ripple and transient response in noise-sensitive circuits. Ensure your input/output capacitors and inductor are rated for the lower frequency, and confirm thermal performance—both parts have similar junction-to-case thermal resistance, but actual PCB copper area and airflow will dictate real-world reliability under full 3A load.
What are the critical failure modes of the LM2596T-3.3 under high ambient temperature or sustained overload, and how can I mitigate them in a sealed industrial enclosure?
The LM2596T-3.3 has a maximum junction temperature of 125°C, but sustained operation near this limit—especially in sealed enclosures with poor airflow—can lead to thermal runaway and premature failure. At 3A output with a 40V input, power dissipation can exceed 10W, requiring substantial heatsinking. To mitigate risk, use a properly sized TO-220 heatsink with thermal interface material, ensure adequate copper pour on the PCB acting as a thermal pad, and consider derating output current above 70°C ambient. Adding overtemperature shutdown circuitry or selecting a synchronous buck alternative with higher efficiency may be necessary for harsh environments.
How does the non-synchronous architecture of the LM2596T-3.3 impact efficiency and EMI compared to modern synchronous buck converters, and should I be concerned for a 12V-to-3.3V, 2A application?
The LM2596T-3.3 uses a non-synchronous buck topology with an external Schottky diode for freewheeling, resulting in lower efficiency (typically 70–80%) compared to synchronous regulators like the TPS54332. In a 12V-to-3.3V, 2A application, this means ~4W of power loss, mostly as heat in the diode and switch. This inefficiency increases thermal stress and reduces battery life in portable systems. Additionally, the 150 kHz switching frequency generates lower-frequency EMI that may interfere with analog sensors or communication lines. If efficiency, thermal performance, or EMI are concerns, consider upgrading to a synchronous alternative, even if it requires a surface-mount redesign.
Since the LM2596T-3.3 is RoHS non-compliant, can I still use it in commercial products sold in the EU, and what documentation or exemptions apply?
The LM2596T-3.3 is RoHS non-compliant, meaning it contains restricted substances like lead in excess of EU RoHS thresholds. While it may still be used in certain applications under specific exemptions (e.g., Annex III exemptions for industrial or military equipment), it cannot be used in general commercial electronics intended for the EU market without violating Directive 2011/65/EU. If your product falls under an exempt category, maintain thorough documentation proving eligibility. For broader market access, switch to a RoHS-compliant alternative such as the LM2596T-3.3/NOPB (if available) or the LM2576T-3.3G, both of which are designed to meet environmental regulations.
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.
LM2596T-3.3 CAD Models
Texas Instruments LM2596T-3.3 PCB symbols & footprints
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