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LM2575SX-3.3/NOPB
Texas Instruments
IC REG BUCK 3.3V 1A DDPAK
17633 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 1A TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
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5.0 / 5.0
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LM2575SX-3.3/NOPB
Product Overview
1353824
DiGi Electronics Part Number
LM2575SX-3.3/NOPB-DGManufacturer
Texas Instruments
LM2575SX-3.3/NOPB
Description
IC REG BUCK 3.3V 1A DDPAKInventory
17633 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 1A TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Quantity
Minimum 1
Minimum 1
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LM2575SX-3.3/NOPB Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Fixed
Number of Outputs
1
Voltage - Input (Min)
4V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
3.3V
Voltage - Output (Max)
-
Current - Output
1A
Frequency - Switching
52kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package
TO-263 (DDPAK-5)
Base Product Number
LM2575
Datasheet & Documents
Manufacturer Product Page
LM2575SX-3.3/NOPB Specifications
HTML Datasheet
LM2575SX-3.3/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM2575SX-3.3/NOPBDKR
LM2575SX33NOPB
LM2575SX-3.3/NOPBTR
LM2575SX-3.3/NOPB-DG
LM2575SX-3.3/NOPBCT
LM2575SX-3.3-NDR
*LM2575SX-3.3/NOPB
Standard Package
500
Alternative Parts
PART 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
價格平實，售後服務周到，讓我感到非常滿意。
de desembre 02, 2025
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de desembre 02, 2025
The tracking information was detailed and always up-to-date.
de desembre 02, 2025
Their affordable prices make it simple to get the best technology without overspending.
de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key thermal and layout considerations when designing a PCB for the LM2575SX-3.3/NOPB to ensure reliable operation at full 1A load in a compact enclosure?
When using the LM2575SX-3.3/NOPB at its full 1A output current, proper thermal management is critical due to its non-synchronous buck topology and inherent switching losses. The TO-263 (DDPAK-5) package relies heavily on the PCB copper pour connected to the tab for heat dissipation—use a minimum of 2 in² of 2 oz copper on the top layer with thermal vias to inner or bottom layers. Keep the input capacitor (≥47 µF low-ESR electrolytic or tantalum) within 10 mm of the VIN and GND pins to minimize high-frequency loop area. Avoid routing sensitive analog signals under the regulator or inductor. In enclosed spaces, verify junction temperature stays below 125°C using TI’s Webench tool or thermal imaging during prototyping, especially if ambient exceeds 50°C.
Can the LM2575SX-3.3/NOPB safely replace an older LM2576HVS-3.3 in a 24V industrial input application, and what design risks should I evaluate?
While both are 3.3V fixed-output buck regulators, direct replacement of the LM2576HVS-3.3 with the LM2575SX-3.3/NOPB requires careful evaluation. The LM2575SX-3.3/NOPB supports up to 40V input (vs. 60V for the HVS version), so it remains within spec for 24V systems—but leave sufficient margin for voltage transients (e.g., load dumps). More critically, the LM2575 runs at 52 kHz versus the LM2576’s typical 52–100 kHz range; this may affect inductor selection and EMI profile. Ensure your existing inductor meets the LM2575’s recommended 100 µH value and saturation current >1.5A. Also verify startup behavior under light loads, as the LM2575 has slightly different soft-start characteristics that could impact sequencing in multi-rail designs.
How does the LM2575SX-3.3/NOPB compare to the newer TPS54202DDCR for a cost-sensitive 12V-to-3.3V conversion, and when should I avoid upgrading?
The TPS54202DDCR offers higher efficiency (up to 95% vs. ~80% for LM2575SX-3.3/NOPB), smaller footprint (SOIC-8 vs. DDPAK-5), and synchronous rectification—making it superior for battery-powered or space-constrained designs. However, the LM2575SX-3.3/NOPB remains preferable in high-noise environments or legacy systems where simplicity, proven reliability, and wide input tolerance (up to 40V) outweigh efficiency gains. Avoid switching if your design already passes EMI compliance with the LM2575, uses through-hole assembly (despite its SMD package, the DDPAK is easier to hand-solder than SOIC), or operates near the TPS54202’s 2A limit—the LM2575’s 1A rating with robust thermal derating can be more predictable in harsh conditions.
What failure modes should I anticipate if the LM2575SX-3.3/NOPB is operated near its 40V absolute maximum input voltage with poor input filtering?
Operating the LM2575SX-3.3/NOPB near 40V without adequate input filtering risks catastrophic failure due to voltage spikes from parasitic inductance during switching transitions. Without a properly sized bulk capacitor (e.g., 100 µF low-ESR) and a high-frequency ceramic (1–10 µF) close to the IC, transient overshoots can exceed the 40V absolute max, damaging the internal switch. Additionally, high dV/dt stress accelerates wear on the control circuitry, potentially causing premature latch-up or output instability. Always include a TVS diode or input clamp if the source has inductive characteristics (e.g., long cables or relays), and derate input voltage to ≤36V in mission-critical applications to account for real-world transients.
Is the LM2575SX-3.3/NOPB suitable for automotive 12V battery systems subject to cold-crank and load-dump conditions, and how should I protect it?
The LM2575SX-3.3/NOPB can be used in automotive 12V systems but requires external protection due to its 40V absolute maximum input. During load-dump events, voltages can spike to 40V+ (per ISO 7637-2), risking device failure. Implement a series Schottky diode (e.g., MBRB20H100CTT4G) plus a 36V–39V TVS diode (e.g., SMAJ36A) at the input to clamp transients. For cold-crank scenarios (down to 4V), the LM2575SX-3.3/NOPB will maintain regulation down to 4V input, but ensure the input capacitor bank retains sufficient charge during voltage dips. Also consider adding reverse-battery protection (e.g., P-channel MOSFET) since the IC lacks built-in reverse-polarity robustness. Validate the complete solution against AEC-Q100 stress tests if targeting under-hood applications.
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LM2575SX-3.3/NOPB CAD Models
Texas Instruments LM2575SX-3.3/NOPB PCB symbols & footprints
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