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LM2574N-5.0
Texas Instruments
IC REG BUCK 5V 500MA 8DIP
1542 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 5V 1 Output 500mA 8-DIP (0.300", 7.62mm)
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5.0 / 5.0
- (55 Ratings)
LM2574N-5.0
Product Overview
1285163
DiGi Electronics Part Number
LM2574N-5.0-DGManufacturer
Texas Instruments
LM2574N-5.0
Description
IC REG BUCK 5V 500MA 8DIPInventory
1542 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 5V 1 Output 500mA 8-DIP (0.300", 7.62mm)
Quantity
Minimum 1
Minimum 1
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LM2574N-5.0 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)
4V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
5V
Voltage - Output (Max)
-
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-5.0-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
View DetailsPART 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
My order arrived in just a few days, and the parts have shown exceptional durability even after multiple cycles.
de desembre 02, 2025
Built with durability in mind, the product handles regular wear without issues.
de desembre 02, 2025
The after-sales support from DiGi Electronics is top-notch, making me feel confident in my purchase.
de desembre 02, 2025
Product consistency at DiGi Electronics ensures that I receive the same high-quality experience every time.
de desembre 02, 2025
DiGi Electronics consistently provides excellent support after my purchases.
de desembre 02, 2025
客服团队友善热情，耐心解答所有我的疑问。
de desembre 02, 2025
Fast response times from the website made browsing a pleasure.
de desembre 02, 2025
Open pricing fosters a strong, trustworthy relationship with customers.
de desembre 02, 2025
Fast shipment turnaround times ensure projects stay on schedule.
de desembre 02, 2025
Shipping was lightning fast, and the after-sales team provided clear and helpful solutions.
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Frequently Asked Questions (FAQ)
Can the LM2574N-5.0 be safely used as a drop-in replacement for the LM2575T-5.0 in a 12V to 5V/500mA industrial control board, and what design risks should I consider given the LM2574N-5.0 is now obsolete?
While the LM2574N-5.0 and LM2575T-5.0 share similar input/output specs (4–40V input, 5V fixed output, 500mA), the LM2575T-5.0 has a higher switching frequency (52kHz vs. 150kHz) and different compensation requirements, making it non-drop-in compatible. More critically, the LM2574N-5.0 is obsolete, so long-term sourcing is unreliable. If you must use it temporarily, verify inductor saturation current (≥700mA recommended), ensure adequate heatsinking due to lower efficiency at high Vin, and plan for migration to a modern alternative like the TPS54202 or LM2596-5.0. Always test thermal performance under full load and worst-case ambient conditions.
What are the key reliability concerns when designing with the LM2574N-5.0 in an automotive under-hood application where ambient temperatures can reach 105°C, and how does its lack of synchronous rectification impact thermal management?
The LM2574N-5.0’s junction temperature can exceed safe limits in high-ambient environments due to its non-synchronous buck topology, which relies on an external Schottky diode for freewheeling—introducing additional conduction losses. At 105°C ambient and 500mA load, even moderate input voltages (e.g., 24V) can push TJ beyond 125°C without proper PCB copper area for heat spreading. Use a thermally enhanced 8-DIP socket or attach the package to a large ground-plane copper pour. Monitor diode selection (e.g., 1N5819 or SB560) for reverse leakage at high temps. Consider derating output current to 300–400mA and validate with thermal imaging during HALT testing.
How does the LM2574N-5.0 compare to its direct substitute LM2574N-5.0/NOPB in terms of long-term availability, RoHS compliance, and performance in medical device designs requiring full regulatory traceability?
The LM2574N-5.0/NOPB is the RoHS-compliant, lead-free version of the LM2574N-5.0 and is the recommended substitute, but both are now obsolete per Texas Instruments’ product status. While electrically identical, the /NOPB variant supports modern environmental compliance—critical for medical devices. However, neither offers new production support, so lifetime buys or second-source strategies are essential. For new medical designs, avoid both and migrate to active, certified alternatives like the TPS7A4700 (low-noise LDO) or LM5164 (buck converter with enhanced reliability documentation). Always request full lot traceability and COC from authorized distributors if using remaining stock.
What input voltage transients or noise conditions could cause premature failure of the LM2574N-5.0 in a 24V industrial bus system, and how should I protect it given its 40V absolute maximum rating?
Industrial 24V systems often experience voltage spikes from inductive loads or load dumps that can exceed 40V—the LM2574N-5.0’s absolute max input. Even brief transients above this threshold risk gate oxide damage in the internal switch. To mitigate, add a TVS diode (e.g., SMAJ33A) rated for 33V clamping near the input pin, along with a low-ESR input capacitor (≥100µF electrolytic + 10µF ceramic) to absorb high-frequency energy. Include a series fuse or PTC resettable fuse for overcurrent protection. Validate transient response using an ESD/EFT simulator per IEC 61000-4-4/5 standards, especially if the LM2574N-5.0 powers sensitive logic downstream.
Is it feasible to parallel two LM2574N-5.0 regulators to achieve 1A output current in a space-constrained through-hole design, and what are the stability and current-sharing risks?
Paralleling LM2574N-5.0 devices is not recommended due to lack of current-sharing control and fixed-frequency operation without synchronization. Minor variations in feedback thresholds or layout parasitics cause one regulator to carry most of the load, leading to thermal runaway—especially problematic given the part’s already marginal efficiency (~75% at 24Vin). Even with matched inductors and shared input/output capacitors, cross-conduction and beat-frequency oscillations may occur. Instead, select a single higher-current solution like the LM2596-5.0 (3A) or synchronous buck such as the LM2678-5.0. If space limits SMD options, use a through-hole LM3485-based design with external MOSFET for scalable current delivery.
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-5.0 CAD Models
Texas Instruments LM2574N-5.0 PCB symbols & footprints
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