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LM2676SX-5.0/NOPB
Texas Instruments
IC REG BUCK 5V 3A DDPAK
32213 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 5V 1 Output 3A TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
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5.0 / 5.0
- (115 Ratings)
LM2676SX-5.0/NOPB
Product Overview
1286420
DiGi Electronics Part Number
LM2676SX-5.0/NOPB-DGManufacturer
Texas Instruments
LM2676SX-5.0/NOPB
Description
IC REG BUCK 5V 3A DDPAKInventory
32213 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 5V 1 Output 3A TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
Quantity
Minimum 1
Minimum 1
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LM2676SX-5.0/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)
8V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
5V
Voltage - Output (Max)
-
Current - Output
3A
Frequency - Switching
260kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
Supplier Device Package
TO-263 (DDPAK-7)
Base Product Number
LM2676
Datasheet & Documents
Manufacturer Product Page
LM2676SX-5.0/NOPB Specifications
HTML Datasheet
LM2676SX-5.0/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Affected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM2676SX50NOPB
LM2676SX-5.0/NOPBDKR
-LM2676SX-5.0/NOPBCT-DG
LM2676SX-5.0-NDR
LM2676SX-5.0/NOPBTR
*LM2676SX-5.0/NOPB
LM2676SX-5.0/NOPBCT
-LM2676SX-5.0/NOPBCT
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
対応も素早く、丁寧で信頼内容です。配送も非常に早かったです。
de desembre 02, 2025
Their eco-conscious approach makes me trust and prefer their brand.
de desembre 02, 2025
Their competitive prices make it easy to stay within my budget, and their after-sales help is always prompt and professional.
de desembre 02, 2025
DiGi Electronics’ customer-centric approach makes them our trusted partner for electronics solutions.
de desembre 02, 2025
Quick shipping times and proactive support made my experience with DiGi Electronics excellent.
de desembre 02, 2025
I’ve never experienced a defective item from DiGi Electronics, which speaks volumes about their quality control.
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Frequently Asked Questions (FAQ)
When designing a high-efficiency 5V power supply for an industrial control system, how does the LM2676SX-5.0/NOPB compare to the LM2596SX-5.0 in terms of thermal performance and layout sensitivity under continuous 3A load?
The LM2676SX-5.0/NOPB offers superior thermal performance and lower switching losses due to its 260kHz fixed-frequency architecture and optimized internal compensation, compared to the LM2596SX-5.0’s 150kHz operation. Under continuous 3A load, the LM2676SX-5.0/NOPB runs significantly cooler, reducing the need for large copper pours or forced airflow. However, its higher switching frequency demands tighter PCB layout practices—keep input/output capacitors within 5mm of the IC, minimize loop area in the switching node, and use a solid ground plane under the tab. Poor layout can induce EMI and voltage overshoot, negating efficiency gains. Always thermal-via the DDPAK tab to an internal ground plane for optimal heat dissipation.
Can the LM2676SX-5.0/NOPB safely replace a failed LT1074CT in a legacy 24V-to-5V automotive application without redesigning the feedback network or output filtering?
No, direct replacement of the LT1074CT with the LM2676SX-5.0/NOPB is not recommended without circuit modifications. The LT1074CT is an adjustable regulator requiring external feedback resistors, while the LM2676SX-5.0/NOPB is a fixed 5V output device with internal feedback. Additionally, the LT1074 operates at ~100kHz and uses a different compensation scheme. Mismatched output capacitance (ESR and value) can cause instability in the LM2676SX-5.0/NOPB, which requires low-ESR ceramic or polymer capacitors (e.g., 100µF, <100mΩ ESR). You must remove the original feedback network and ensure the input voltage stays above 8V—below this, the LM2676SX-5.0/NOPB may dropout, unlike the LT1074’s lower minimum input.
What are the key reliability risks when using the LM2676SX-5.0/NOPB in a high-vibration environment like a motor drive enclosure, and how can they be mitigated?
In high-vibration settings, the primary risks for the LM2676SX-5.0/NOPB are mechanical stress on the TO-263 (DDPAK-7) leads and solder joints, especially at the tab connection. Over time, this can lead to cracked solder or lifted pads, causing thermal runaway or open circuits. To mitigate, use a robust PCB mounting strategy: secure the tab with multiple thermal vias tied to a thick ground plane, apply conformal coating to reduce stress transfer, and consider strain relief by avoiding rigid traces near the package. Also, ensure input bulk capacitance is mechanically anchored—vibration can fatigue ceramic capacitors. TI recommends a minimum of 4–6 vias under the tab for both thermal and mechanical stability.
How does the absence of synchronous rectification in the LM2676SX-5.0/NOPB impact efficiency at light loads (e.g., <100mA), and what design trade-offs should be considered for battery-powered applications?
The LM2676SX-5.0/NOPB uses a non-synchronous buck topology with an internal Schottky diode, which results in higher conduction losses at light loads compared to synchronous regulators like the TPS54302. At 100mA output, efficiency can drop to 70–75%, significantly reducing battery life in always-on systems. While the LM2676SX-5.0/NOPB lacks pulse-skipping or PFM modes, its simplicity and low quiescent current (~2mA) still make it viable for moderate-duty applications. For battery-powered designs, consider adding a load switch to disable the regulator during sleep modes, or evaluate a synchronous alternative if average current is below 500mA. The trade-off is cost and complexity versus runtime.
Is the LM2676SX-5.0/NOPB suitable for use in a 12V-to-5V point-of-load conversion on a densely populated digital board with sensitive analog sections, and what layout practices minimize noise coupling?
Yes, the LM2676SX-5.0/NOPB is suitable for 12V-to-5V POL applications, but noise coupling into sensitive analog circuits (e.g., ADCs, sensors) is a real risk due to its 260kHz switching frequency and fast edge rates. To minimize interference: place the regulator at least 15mm from analog sections, orient the inductor perpendicular to sensitive traces, and use a shielded drum-core inductor. Route the SW node as short as possible and avoid running it over split planes. Add a small RC snubber (e.g., 10Ω + 1nF) across the inductor if ringing exceeds 50MHz. Use a dedicated ground return path for the output capacitor and star-ground at the load. These steps reduce conducted and radiated emissions, preserving signal integrity in mixed-signal environments.
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.
LM2676SX-5.0/NOPB CAD Models
Texas Instruments LM2676SX-5.0/NOPB PCB symbols & footprints
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