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LM2574N-ADJ
Texas Instruments
IC REG BUCK ADJ 500MA 8DIP
2274 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.23V 1 Output 500mA 8-DIP (0.300", 7.62mm)
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5.0 / 5.0
- (51 Ratings)
LM2574N-ADJ
Product Overview
1333208
DiGi Electronics Part Number
LM2574N-ADJ-DGManufacturer
Texas Instruments
LM2574N-ADJ
Description
IC REG BUCK ADJ 500MA 8DIPInventory
2274 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.23V 1 Output 500mA 8-DIP (0.300", 7.62mm)
Quantity
Minimum 1
Minimum 1
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LM2574N-ADJ 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
Adjustable
Number of Outputs
1
Voltage - Input (Min)
4V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
1.23V
Voltage - Output (Max)
37V
Current - Output
500mA
Frequency - Switching
52kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Supplier Device Package
8-PDIP
Base Product Number
LM2574
Datasheet & Documents
HTML Datasheet
LM2574N-ADJ-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
40
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
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UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Très content de leur offre, les prix sont compétitifs et le service après-vente est toujours très réactif.
de desembre 02, 2025
The seamless logistics tracking process makes shopping hassle-free.
de desembre 02, 2025
Always appreciate their prompt replies when I reach out for support.
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Frequently Asked Questions (FAQ)
What are the key reliability and design risks when using the LM2574N-ADJ in an industrial environment with high ambient temperatures, and how can I mitigate thermal runaway or premature failure?
The LM2574N-ADJ, while rated for -40°C to 125°C junction temperature, is particularly sensitive to thermal stress due to its non-synchronous buck topology and through-hole package, which limits heat dissipation. In high-ambient industrial environments (e.g., >60°C), the 8-DIP package can experience significant thermal resistance, risking junction temperatures exceeding safe limits even at 500mA load. To mitigate this, ensure adequate PCB copper area connected to the GND pin for heatsinking, maintain airflow if possible, and derate output current above 70°C. Avoid placing the LM2574N-ADJ near other heat sources. Consider adding a small heatsink or switching to a surface-mount alternative like the LM2575T-ADJ (in TO-220) for better thermal performance if board space allows.
Can I replace the obsolete LM2574N-ADJ with the LM2574N-ADJG or LM2574N-ADJ/NOPB without redesigning my PCB or firmware, and what subtle differences should I watch for?
Yes, both the LM2574N-ADJG and LM2574N-ADJ/NOPB are direct drop-in replacements for the LM2574N-ADJ and share the same 8-DIP pinout, electrical characteristics, and switching frequency (52kHz). However, the 'G' suffix typically indicates a different reel or packaging configuration, while the '/NOPB' version is RoHS-compliant—critical if your product requires compliance with modern environmental standards. Despite functional equivalence, verify the moisture sensitivity level (MSL 1 for all) and ensure your assembly process aligns with the updated MSL handling requirements. Always cross-check the manufacturer’s latest datasheet for any minor spec drift, especially in startup behavior or transient response under light loads.
What are the hidden stability issues when using the LM2574N-ADJ with low-ESR ceramic output capacitors, and how do I avoid subharmonic oscillation or poor transient response?
The LM2574N-ADJ was designed and characterized with electrolytic or tantalum output capacitors that have moderate ESR (typically 0.1–1Ω), which provides inherent damping in the feedback loop. Replacing these with modern low-ESR ceramic capacitors (<0.01Ω) can destabilize the control loop, leading to subharmonic oscillation, especially at light loads or during fast load transients. To avoid this, add a small series resistor (0.1–0.5Ω, 1/4W) in line with the ceramic capacitor to restore damping, or use a feedforward capacitor across the upper feedback resistor to reshape the loop response. Always validate stability with a transient load test (e.g., 10% to 90% step load) on your actual PCB layout.
How does the LM2574N-ADJ compare to the newer LM2596HVS-ADJ in terms of efficiency, thermal performance, and long-term supply risk for a 24V-to-5V, 400mA application?
In a 24V-to-5V, 400mA application, the LM2574N-ADJ will exhibit significantly lower efficiency (~70–75%) compared to the LM2596HVS-ADJ (~85–88%) due to higher switching losses and lack of synchronous rectification. The LM2596HVS-ADJ also operates at 150kHz, allowing smaller magnetics, and comes in a TO-263 package with better thermal performance. However, the LM2574N-ADJ’s through-hole 8-DIP package may be preferred in vibration-prone environments. Crucially, the LM2574N-ADJ is obsolete, posing long-term supply chain risks—TI recommends migration to the LM2596 family. If redesigning is feasible, the LM2596HVS-ADJ offers better efficiency, lower heat, and active availability, but requires PCB layout changes due to different pinout and package.
What input voltage transients or EMI risks should I consider when deploying the LM2574N-ADJ in automotive or off-battery applications, and how can I protect it without degrading regulation performance?
The LM2574N-ADJ supports up to 40V input, but automotive environments often experience load dump transients exceeding 40V (e.g., ISO 7637-2 pulses up to 60V). Applying such transients directly risks damaging the IC. To protect the LM2574N-ADJ, use a TVS diode (e.g., SMAJ33A) rated for 33V clamping voltage placed close to the input pin, combined with a 10–100µF bulk electrolytic capacitor and a 100nF ceramic capacitor for high-frequency decoupling. Avoid over-filtering with large LC networks that can cause startup inrush issues or instability. Also, ensure the input fuse and reverse-polarity protection (e.g., P-channel MOSFET) are in place—this protects both the LM2574N-ADJ and downstream circuitry from common automotive electrical hazards.
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.
LM2574N-ADJ CAD Models
Texas Instruments LM2574N-ADJ PCB symbols & footprints
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