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Texas Instruments LM2574HVN-3.3/NOPB
- Part No.:
- LM2574HVN-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574HVN-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
LM2574HVN-3.3/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 3.3V output, 52 kHz internal oscillator, 60V maximum input voltage, and integrated cycle-by-cycle current limiting and thermal shutdown. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2574HVN-3.3/NOPB datasheet, LM2574HVN-3.3/NOPB pinout, LM2574HVN-3.3/NOPB application, or LM2574HVN-3.3/NOPB equivalent, key selection criteria include input voltage range (4.75–60V), guaranteed 0.5A output current, ±4% output voltage tolerance over line/load/temperature, 72% typical efficiency at 12VIN/0.5A, and TTL-compatible shutdown with 50 µA standby current.
Technical Context
The LM2574HVN-3.3/NOPB implements a fixed-frequency, current-mode buck topology with internal 52 kHz oscillator and built-in power switch. Its control loop uses internal frequency compensation and requires no external compensation components.
It features cycle-by-cycle peak current limiting (1.0A typical), thermal shutdown activation at ~150°C junction temperature, and TTL-level ON/OFF pin logic (VIH ≥2.4V, VIL ≤0.8V) enabling low-power standby mode. The device operates across −40°C to +125°C junction temperature range with 92°C/W junction-to-ambient thermal resistance in the 8-pin DIP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 4.75–60V input and 0.1–0.5A load |
| Max Input Voltage | 60V - supports wide-input industrial and automotive battery-supplied systems |
| Output Current | Guaranteed 0.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs |
| Oscillator Frequency | 52 kHz fixed - enables use of low-cost, standard inductors (e.g., 330 µH) without EMI filtering complexity |
| Efficiency | 72% typical at 12VIN, 0.5A - reduces thermal load vs. linear regulators; PCB copper acts as sole heatsink |
| Standby Current | 50 µA typical at shutdown - enables ultra-low-power system sleep modes |
| Thermal Protection | Internal thermal shutdown - prevents damage during overload or poor heatsinking |
Pinout & Package
LM2574HVN-3.3/NOPB is housed in an 8-pin plastic DIP (NS package N08A) with exposed pad soldered to PCB for thermal enhancement. Pin 1 is marked with dot; Pin 5 is NC but must be soldered to ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 4.75–60V DC; bypass capacitor required within 1 cm |
| 2 (GND) | Power ground | Common return for input/output capacitors, inductor, and diode |
| 3 (OUT) | Switching node | Drives external catch diode and inductor; high dv/dt node requiring short trace routing |
| 4 (GND) | Power ground | Second ground pin for improved thermal and current path separation |
| 5 (NC) | No internal connection | Must be soldered to PCB ground plane for enhanced thermal conduction |
| 6 (FEEDBACK) | Feedback input | Not used on fixed-output versions; internally tied to output |
| 7 (ON/OFF) | Shutdown control | TTL-compatible; <0.8V = ON, >2.4V = OFF; 50 µA standby current when high |
| 8 (GND) | Power ground | Third ground pin supporting multi-point grounding strategy |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors - reduces BOM count and layout sensitivity |
| 52 kHz fixed-frequency operation | Enables predictable EMI spectrum and compatibility with off-the-shelf 330 µH inductors |
| Integrated current limit & thermal shutdown | Provides autonomous fault protection without external sensing circuitry |
| TTL shutdown with 50 µA standby | Supports low-power system states while retaining fast wake-up capability |
| Only 4 external components required | Reduces design time and board space: input cap, output cap, inductor, Schottky diode |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
Use Scenario: Powering isolated digital I/O channels in programmable logic controllers operating from 24VDC rails. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying FPGA configuration, optocoupler drivers, and ADC reference. Use Value: High efficiency eliminates need for heatsinks in confined enclosures; 60V input withstands load-dump transients up to ISO 7637-2 Pulse 5a. | Use Scenario: Generating 3.3V for microcontroller and CAN transceiver in body electronics modules. IC Role / Device Role / Timing Role: Main system regulator converting 12V battery to stable 3.3V under cold-crank (6.5V) and load-dump (60V) conditions. Use Value: Guaranteed operation down to 4.75V input enables reliable startup during cranking; thermal shutdown prevents latch-up during sustained overloads. |
| Medical Sensor Hub | Point-of-Sale Terminal |
Use Scenario: Providing clean 3.3V rail for low-noise analog front-ends and wireless BLE SoCs in portable diagnostic devices. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding LDOs that supply precision analog circuits and RF sections. Use Value: 72% efficiency minimizes self-heating near temperature-sensitive sensors; fixed-frequency operation simplifies conducted EMI filtering. | Use Scenario: Powering embedded ARM processor, display driver, and EMV smart-card reader in retail terminals. IC Role / Device Role / Timing Role: Primary DC-DC converter stepping down 12V adapter input to 3.3V main logic rail. Use Value: 0.5A output supports burst-mode CPU loads; DIP package allows manual rework and prototyping flexibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-3.3 | Standard-voltage version (40V max input) vs. HV version's 60V rating; identical pinout and electrical specs otherwise | Suitable only where input never exceeds 40V - excludes automotive load-dump or industrial 48V systems | Select LM2574N-3.3 only if input voltage is strictly limited to ≤40V and cost is primary concern |
| LM2596-3.3 | Higher 3A output current, 150 kHz switching frequency, tighter ±2% output tolerance, but requires different inductor value and layout | Better suited for higher-current or lower-ripple applications; not drop-in due to frequency and compensation differences | Choose LM2596-3.3 when >0.5A load or improved regulation accuracy is required; redesign inductor and compensation network |
Compared with LM2574N-3.3, LM2574HVN-3.3/NOPB adds 20V headroom for transient robustness; compared with LM2596-3.3, it trades current capacity and precision for proven reliability, simpler magnetics, and lower EMI at 52 kHz - making it optimal for cost-sensitive, thermally constrained 0.5A designs.
Availability
LM2574HVN-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical sensor hubs, and point-of-sale terminals requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2574HVN-3.3/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments acquired National Semiconductor in 2011 and maintains its legacy analog product lines including the SIMPLE SWITCHER™ family. TI provides full technical documentation, simulation models, and application support for these regulators.
The LM2574HVN-3.3/NOPB belongs to TI's SIMPLE SWITCHER™ buck regulator product line, designed specifically for engineers needing robust, easy-to-use DC-DC conversion with minimal external components in industrial, automotive, and medical power systems.
FAQ
What is the maximum input voltage rating for LM2574HVN-3.3/NOPB?
The LM2574HVN-3.3/NOPB has a maximum input voltage rating of 60V, confirmed in the Absolute Maximum Ratings table. This HV designation distinguishes it from the standard LM2574N-3.3 (40V max), enabling use in 48V industrial systems and automotive applications subject to load-dump transients per ISO 7637-2.
Does LM2574HVN-3.3/NOPB require external compensation components?
No, LM2574HVN-3.3/NOPB does not require external compensation components. Its internal frequency compensation is fully integrated and optimized for stability with the standard 4-component application circuit (input capacitor, output capacitor, inductor, Schottky diode), as verified in the "Requiring a minimum number of external components" section of the datasheet.
What is the guaranteed output current capability of LM2574HVN-3.3/NOPB?
The LM2574HVN-3.3/NOPB guarantees 0.5A continuous output current across the full operating temperature range (−40°C to +125°C) and input voltage range (4.75–60V), as stated in the General Description and confirmed in the Electrical Characteristics tables under "Guaranteed 0.5A output current".
Can LM2574HVN-3.3/NOPB be used in discontinuous conduction mode?
Yes, LM2574HVN-3.3/NOPB supports both continuous and discontinuous conduction modes. The datasheet explicitly states "The LM2574 (or any of the Simple Switcher family) can be used for both continuous and discontinuous modes of operation", and provides design guidance for both in the Application Hints section.
What is the thermal resistance (θJA) of LM2574HVN-3.3/NOPB in its DIP package?
The LM2574HVN-3.3/NOPB has a junction-to-ambient thermal resistance (θJA) of 92°C/W with approximately 1 square inch of PCB copper, and 72°C/W with 4 square inches of 1 oz. copper, as specified in the Electrical Characteristics table under "All Output Voltage Versions". Pin 5 must be soldered to the ground plane to achieve optimal thermal performance.
LM2574HVN-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2574HVN-3.3/NOPB FAQ
1.How can I place an order for LM2574HVN-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVN-3.3/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2574HVN-3.3/NOPB reliable?
The price and inventory of LM2574HVN-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVN-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVN-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVN-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVN-3.3/NOPB?
LM2574HVN-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVN-3.3/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2574HVN-3.3/NOPB?
For technical support, including LM2574HVN-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVN-3.3/NOPB requirements.
6.How does Aetrix verify that LM2574HVN-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVN-3.3/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2574HVN-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVN-3.3/NOPB?
All LM2574HVN-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVN-3.3/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2574HVN-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVN-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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