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Texas Instruments LM2574HVN-12
- Part No.:
- LM2574HVN-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574HVN-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,290
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Product details
Overview
LM2574HVN-12 from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator in an 8-pin DIP package, delivering a fixed 12V output with ±4% tolerance over line and load, 52 kHz fixed-frequency operation, and input voltage support up to 60V. It integrates oscillator, error amplifier, current-limiting switch, and thermal shutdown for standalone DC/DC conversion in industrial power rails.
For engineers reviewing the LM2574HVN-12 datasheet, LM2574HVN-12 pinout, LM2574HVN-12 application, or LM2574HVN-12 equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency (88% at 15VIN/0.5A), real-world thermal resistance (72°C/W with 4 in² copper), and two rigorously cross-referenced alternative parts for design continuity.
Technical Context
The LM2574HVN-12 implements a fixed-frequency, current-mode buck topology with internal 52 kHz oscillator and cycle-by-cycle peak current limiting. Its feedback loop uses a precision 1.23V reference applied to the FB pin, enabling stable regulation without external compensation components.
It operates across −40°C to +125°C junction temperature, supports TTL-compatible ON/OFF control (1.4V logic high threshold), and delivers regulated 12V output with dropout behavior defined by minimum input voltage (15V) and saturation voltage (1.2V max at 0.5A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over 15–60V input and 0.1–0.5A load - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Input Voltage | 60V - supports wide-range industrial inputs including 48V systems and transient-tolerant designs. |
| Output Current | Guaranteed 0.5A continuous - sufficient for powering multiple ICs or small subsystems without external pass devices. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, standard inductors (e.g., 330 µH) and simplifies EMI filtering vs. higher-frequency alternatives. |
| Efficiency | 88% at 15VIN, 0.5A load - reduces thermal load on PCB; copper traces alone serve as heat sink per datasheet guidance. |
| Thermal Resistance | 72°C/W (with 4 in² 1 oz. copper) - defines board-level thermal design requirement for full-load operation at 125°C ambient. |
| Standby Current | 50 µA typical (ON/OFF pin high) - enables low-power sleep modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM2574HVN-12 is housed in an 8-pin plastic DIP (NS package N08A), with Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output, Pin 4 = Feedback (not used in fixed-output version), Pin 5 = Ground, Pin 6 = ON/OFF, Pin 7 = Ground, Pin 8 = Catch Diode Connection. Pin 4 is internally connected to VOUT for fixed versions and must be left unconnected externally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input supply connection | Accepts 15–60V DC; requires ≥22 µF input capacitor placed adjacent to minimize switching noise. |
| Pin 2 (GND) | Power ground reference | Primary return path for input capacitor, catch diode, and inductor; must be tied to low-impedance ground plane. |
| Pin 3 (OUT) | Regulated output node | Delivers 12V to load; connects to output capacitor (≥220 µF) and catch diode cathode. |
| Pin 4 (FB) | Feedback input | Internally tied to output for fixed 12V version; leave unconnected externally - not a user-adjustable node. |
| Pin 5 (GND) | Additional ground terminal | Reduces ground impedance; must be soldered to PCB copper for optimal thermal transfer and noise immunity. |
| Pin 6 (ON/OFF) | Enable/disable control | TTL-compatible: <1.2V = ON, >2.2V = OFF; draws only 50 µA in shutdown mode. |
| Pin 7 (GND) | Third ground terminal | Provides additional low-inductance ground path; required for thermal performance and stability. |
| Pin 8 (SW) | Internal switch collector | Connects to catch diode anode and inductor; carries pulsed 0.5A current; layout must minimize trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated current-limit protection | Peak switch current limited to 0.65–1.8A range - prevents damage during overload or short-circuit without external sensing. |
| Thermal shutdown | Activates at 150°C junction temperature - protects device under sustained overload or poor heatsinking. |
| Fixed-frequency oscillator | 52 kHz nominal, ±10% tolerance - enables predictable filter design and avoids audible noise in sensitive applications. |
| Low external component count | Only four external parts required (inductor, catch diode, input/output capacitors) - accelerates prototyping and reduces BOM cost. |
| High-voltage input capability | 60V absolute maximum input - supports direct connection to unregulated 48V telecom or industrial bus rails. |
Applications
| Industrial Power Supply | Automotive Subsystem Rail |
|---|---|
Use Scenario: Generating a clean 12V rail from a 24V or 48V industrial bus to power PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient DC/DC conversion with built-in fault protection. Use Value: Eliminates need for linear pre-regulators; achieves 88% efficiency at 0.5A, reducing board-level heat generation and enabling compact enclosure designs. | Use Scenario: Powering infotainment display controllers and CAN transceivers from a 24V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Buck converter supplying stable 12V output despite input dips to 15V during cranking events. Use Value: Maintains regulation down to 15V input (per datasheet), supporting operation during engine start; 60V max rating handles load-dump transients. |
| Embedded Control Board | Legacy Equipment Retrofit |
Use Scenario: Replacing aging 7812 linear regulators on legacy embedded boards requiring 12V at up to 500 mA. IC Role / Device Role / Timing Role: Drop-in switching replacement offering high-efficiency alternative to linear regulation without redesigning PCB layout. Use Value: Reduces power dissipation from ~3W (linear) to ~0.7W (switching) at 24VIN/12VOUT/0.5A - eliminates need for heatsinks and improves system reliability. | Use Scenario: Upgrading obsolete 12V power supplies in test equipment where space and thermal constraints prevent using larger modules. IC Role / Device Role / Timing Role: Compact, through-hole mounted DC/DC solution compatible with existing DIP footprints and hand-soldering processes. Use Value: Uses standard 8-pin DIP socket; requires no rework of board artwork - only component-level swap with minimal external part changes. |
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-12 | Standard-voltage variant (40V max input) vs. HV version's 60V rating; identical 12V output, 0.5A, 52 kHz, and DIP-8 package. | Limited to ≤40V input systems; unsuitable for 48V bus or load-dump scenarios where LM2574HVN-12's 60V rating is essential. | Select LM2574N-12 only if input never exceeds 40V and cost sensitivity outweighs transient robustness. |
| LM2596-12 | Higher 3A output current, 150 kHz switching frequency, and improved 4% output tolerance; requires different inductor value and layout due to faster switching. | Better suited for higher-current loads or space-constrained designs needing smaller magnetics; not pin-compatible with LM2574HVN-12. | Choose LM2596-12 when upgrading beyond 0.5A or optimizing for size/efficiency; expect PCB layout revision and inductor reselection. |
Compared with LM2574N-12, the LM2574HVN-12 adds 20V input headroom critical for industrial transients; versus LM2596-12, it trades higher current and frequency for proven DIP-8 compatibility and simpler EMI filtering at 52 kHz - making it optimal for drop-in reliability upgrades.
Availability
LM2574HVN-12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive subsystems, and embedded control boards requiring stable component supply, long-term lifecycle support, and through-hole manufacturability.
Supply support for LM2574HVN-12 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 full technical and supply chain responsibility for the SIMPLE SWITCHER™ product line.
The LM2574 series was designed specifically for cost-sensitive, medium-current DC/DC conversion in industrial, automotive, and instrumentation applications where reliability, simplicity, and wide-input operation are prioritized over ultra-high efficiency or miniaturization.
FAQ
What is the minimum input voltage required for LM2574HVN-12 to regulate 12V output?
The LM2574HVN-12 requires a minimum input voltage of 15V to maintain regulation at full 0.5A load, as specified in the Electrical Characteristics table under "VOUT Output Voltage" conditions for LM2574HV-12. Below 15V, dropout occurs and output voltage drops linearly with input.
Can LM2574HVN-12 be used with an adjustable output configuration?
No - LM2574HVN-12 is a fixed-output variant with internal feedback divider set for 12V. For adjustable operation, LM2574HVN-ADJ must be used; its FB pin is accessible and requires external resistor network per Figure 2 in the datasheet.
What is the recommended inductor value for LM2574HVN-12 in continuous conduction mode?
The datasheet specifies 330 µH for continuous mode operation with 15V input and 0.5A load (Figure 6, LM2574HV-12 Inductor Selection Guide). Pulse Engineering PE-52627, Renco RL-1284-330, or NPI NP5920/5921 are validated equivalents per Figure 3.
Does LM2574HVN-12 require an external catch diode, and what type is recommended?
Yes - LM2574HVN-12 requires an external Schottky catch diode connected between Pin 8 (SW) and Pin 3 (OUT). The datasheet recommends 11DQ06 (60V, 1A) or SR106 for 12V output; reverse voltage rating must exceed 1.25× max input (≥75V for 60V input).
How does thermal performance of LM2574HVN-12 change with PCB copper area?
Thermal resistance θJA drops from 92°C/W (1 in² copper) to 72°C/W (4 in² copper) per datasheet Note 9. This 22% improvement directly lowers junction temperature - e.g., at 0.5A/15VIN, power dissipation is ~0.7W, so ΔTJ decreases from 64°C to 50°C, enhancing reliability and derating margin.
LM2574HVN-12 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):
- 12V
- 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-12 FAQ
1.How can I place an order for LM2574HVN-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVN-12 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-12 reliable?
The price and inventory of LM2574HVN-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVN-12 is usually 5 days.
3.What payment methods are accepted for LM2574HVN-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVN-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVN-12?
LM2574HVN-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVN-12 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-12?
For technical support, including LM2574HVN-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVN-12 requirements.
6.How does Aetrix verify that LM2574HVN-12 is sourced from the original manufacturer or authorized distributors?
All LM2574HVN-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2574HVN-12?
All LM2574HVN-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVN-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2574HVN-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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