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LM2674MX-3.3/NOPB
Texas Instruments
IC REG BUCK 3.3V 500MA 8SOIC
34996 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
- (296 Ratings)
LM2674MX-3.3/NOPB
Product Overview
1294270
DiGi Electronics Part Number
LM2674MX-3.3/NOPB-DGManufacturer
Texas Instruments
LM2674MX-3.3/NOPB
Description
IC REG BUCK 3.3V 500MA 8SOICInventory
34996 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/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)
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
Manufacturer Product Page
LM2674MX-3.3/NOPB Specifications
HTML Datasheet
LM2674MX-3.3/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
-LM2674MX-3.3/NOPBCT
LM2674MX-3.3-NDR
LM2674MX-3.3/NOPBTR
LM2674MX-3.3/NOPBCT
LM2674MX-3.3/NOPBDKR
*LM2674MX-3.3/NOPB
LM2674MX33NOPB
-LM2674MX-3.3/NOPBCT-DG
Standard Package
2,500
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
Les produits sont à la fois élégants, durables et abordables. Parfait pour mon budget.
de desembre 02, 2025
パッケージの耐久性が高く、輸送中の衝撃にも強いです。
de desembre 02, 2025
Dependable logistics tracking and excellent customer support are their strengths.
de desembre 02, 2025
The eco-friendly yet durable packaging was a delightful surprise, demonstrating social responsibility.
de desembre 02, 2025
Their commitment to eco packaging is evident, and shipping was surprisingly fast.
de desembre 02, 2025
Customer support is responsive and courteous, making troubleshooting straightforward.
de desembre 02, 2025
Their capacity to ship swiftly and support customers diligently is commendable.
de desembre 02, 2025
The resilience of their components ensures long-term success for my designs.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the LM2674MX-3.3/NOPB in high-vibration industrial environments, and how can I mitigate them despite its 8-SOIC package limitations?
The LM2674MX-3.3/NOPB’s 8-SOIC package, while compact, offers limited mechanical robustness under sustained vibration—common in industrial or automotive applications. Solder joints may fatigue over time, leading to intermittent operation or failure. To mitigate this, use conformal coating to stabilize the PCB assembly, implement strain relief for adjacent traces, and consider potting the regulator section if environmental specs exceed typical office conditions. Additionally, ensure adequate copper anchoring around the package pads and avoid mounting the board near high-vibration sources like motors or fans.
Can I safely replace the LM2674MX-3.3/NOPB with a cheaper alternative like the MC34063A in a 12V-to-3.3V, 400mA application, and what performance trade-offs should I expect?
Replacing the LM2674MX-3.3/NOPB with the MC34063A is technically possible but introduces significant trade-offs: the MC34063A operates at a much lower switching frequency (~100kHz typical vs. 260kHz), requiring larger inductors and output capacitors, increasing board area and cost. Efficiency will drop by 10–15%, especially at higher loads, due to higher switch losses and lack of integrated MOSFET. Additionally, the MC34063A lacks built-in soft-start and thermal shutdown, increasing risk of inrush current and thermal runaway. Only consider this swap in cost-sensitive, low-duty-cycle applications where size and efficiency are not critical.
How does input voltage ripple above 20V affect long-term reliability of the LM2674MX-3.3/NOPB, and what input filtering is recommended for noisy automotive power rails?
The LM2674MX-3.3/NOPB can tolerate up to 40V input, but sustained high-voltage ripple—common on unregulated automotive 12V systems with load dumps or alternator noise—accelerates stress on internal components and reduces MTBF. To protect the device, implement a π-filter (LC or RC) at the input using a low-ESR ceramic capacitor (≥10µF, 50V rating) followed by a ferrite bead and bulk electrolytic capacitor (100µF). This suppresses high-frequency noise and transient spikes, ensuring stable operation and extending the regulator’s lifespan under harsh electrical conditions.
Is it safe to operate the LM2674MX-3.3/NOPB near its 500mA current limit continuously in a 25°C ambient environment without a heatsink, and what derating guidelines apply?
While the LM2674MX-3.3/NOPB can deliver 500mA, continuous operation at full load without thermal management risks junction temperatures exceeding safe limits—especially when input voltage is high (e.g., 24V or 36V). At 25°C ambient, power dissipation can reach ~1W (P = (Vin – Vout) × Iout), pushing TJ close to 125°C with minimal PCB copper. TI recommends derating output current by 20–30% for continuous use above 12V input. Increase thermal relief by using a 2-layer PCB with a solid ground plane under the IC and thermal vias to dissipate heat. Monitor TJ in your specific layout using thermal imaging or simulation tools.
What layout pitfalls should I avoid when designing a PCB for the LM2674MX-3.3/NOPB to prevent instability or EMI issues, especially in dense digital systems?
Poor PCB layout is a leading cause of instability and EMI with the LM2674MX-3.3/NOPB. Keep the input capacitor within 5mm of the VIN and GND pins to minimize high-frequency loop area. Route the SW node (pin 2) as short and wide as possible to reduce radiated noise. Avoid running sensitive analog or clock traces under the inductor or SW node. Use a single-point ground connection between the regulator’s GND pin and the system ground plane to prevent ground bounce. Finally, ensure the feedback path (internal in this fixed-output version) is not exposed to switching noise—though no external FB resistors are needed, keep the output capacitor close to the IC to maintain loop stability.
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/NOPB CAD Models
Texas Instruments LM2674MX-3.3/NOPB PCB symbols & footprints
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