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Texas Instruments LM2574HVN-12/NOPB
- Part No.:
- LM2574HVN-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574HVN-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:215
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Product details
Overview
LM2574HVN-12/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 12V output, 60V maximum input voltage, 52 kHz internal oscillator, ±4% output voltage tolerance, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring efficient 12V rail generation from unregulated DC sources.
For engineers reviewing the LM2574HVN-12/NOPB datasheet, LM2574HVN-12/NOPB pinout, LM2574HVN-12/NOPB application, or LM2574HVN-12/NOPB equivalent, key selection considerations include input voltage range (up to 60V), output current capability (0.5A), fixed 12V output accuracy, DIP-8 package thermal performance, and external component count (only 4 required).
Technical Context
The LM2574HVN-12/NOPB implements a fixed-frequency PWM buck topology with internal NPN switch, feedback comparator, oscillator, and protection circuitry. Its 52 kHz switching frequency enables use of standard off-the-shelf inductors while balancing efficiency and EMI.
It operates in continuous conduction mode at full load (0.5A) with typical efficiency of 88% at VIN = 15V, and transitions to discontinuous mode under light loads. Output regulation is achieved via internal voltage reference (1.23V) and error amplifier comparing feedback voltage to reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over line/load/temperature - ensures stable 12V rail without external resistors. |
| Max Input Voltage | 60V - supports wide-input industrial, automotive, and telecom supply rails. |
| Output Current | 0.5A guaranteed - sufficient for powering microcontrollers, sensors, and analog circuitry. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH). |
| Efficiency | 88% typ. at VIN=15V, IOUT=0.5A - reduces heat sink requirements; PCB copper traces suffice for thermal management. |
| Quiescent Current | 5 mA max - low no-load consumption for battery-backed or standby systems. |
| Standby Current | 50 µA typ. with ON/OFF pin high - enables remote power control with minimal system leakage. |
Pinout & Package
LM2574HVN-12/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 8 is VIN, pin 5 is GND, pin 6 is OUTPUT, and pin 7 is the ON/OFF control terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Feedback (FB) | Internally connected to 12V output - no external resistor network required for fixed version. |
| 2 | Ground (GND) | Power and signal reference plane; connects to PCB ground plane for thermal and noise control. |
| 3 | Output (OUTPUT) | Switch node driving external catch diode and inductor; carries pulsed 0.5A current. |
| 4 | Ground (GND) | Second ground pin - must be tied to same ground plane as Pin 2 for low-impedance return path. |
| 5 | Ground (GND) | Third ground pin - enhances thermal conduction and reduces ground bounce. |
| 6 | Input (VIN) | Main power input (4.75–60V); requires ≥22 µF input capacitor placed adjacent to this pin. |
| 7 | ON/OFF | TTL-compatible enable/disable control; <1.0V = ON, >2.2V = OFF; draws ≤30 µA in shutdown. |
| 8 | Ground (GND) | Fourth ground pin - completes thermal path; all four GND pins must be soldered to large copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistors - simplifies layout and improves long-term stability vs. adjustable variants. |
| High-voltage input rating | 60V max input enables direct operation from 48V telecom, 36V industrial, or automotive transients without pre-regulation. |
| Thermal shutdown + current limit | Protects against sustained overload or short-circuit without external circuitry - ensures robust field reliability. |
| Low external part count | Only 4 components required (inductor, diode, input cap, output cap) - accelerates design cycle and reduces BOM cost. |
| 52 kHz fixed oscillator | Enables use of low-DCR, high-saturation inductors with predictable EMI profile - avoids audible noise and simplifies filtering. |
Applications
| Industrial Power Supply | Automotive Control Unit |
|---|---|
Use Scenario: Generating 12V logic rail from 24V vehicle battery in engine control modules (ECMs) and body control units (BCUs). IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing isolated, regulated 12V for MCU, CAN transceivers, and sensor interfaces. Use Value: Withstands 60V load dump transients per ISO 7637-2; 88% efficiency minimizes under-hood thermal rise. | Use Scenario: On-card 12V supply for programmable logic controllers (PLCs) operating from 36–60V DC industrial bus. IC Role / Device Role / Timing Role: Step-down regulator delivering clean 12V to FPGA I/O banks and analog front-ends in modular I/O cards. Use Value: Fixed 12V output eliminates trimming; DIP-8 package allows manual rework and conforms to IPC-7351B land pattern. |
| Test Equipment Power | Legacy System Retrofit |
Use Scenario: Compact 12V supply in portable multimeters and handheld oscilloscopes powered by 4×AA or Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing linear regulators to extend battery life and reduce self-heating. Use Value: 50 µA standby current enables multi-week shelf life; 0.5A output supports LCD backlight and ADC reference circuits. | Use Scenario: Drop-in replacement for obsolete 7812 linear regulators in legacy medical devices and lab instruments. IC Role / Device Role / Timing Role: Direct functional upgrade delivering same 12V output with 3× higher efficiency and no heatsink. Use Value: Same DIP-8 footprint and pinout as LM7812; only requires adding inductor, diode, and two capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVS-12 | 3A output current, 150 kHz switching, TO-220 package, requires external diode | Higher current, higher frequency, different thermal interface - not pin-compatible | Select when >0.5A load or lower ripple is required; board redesign needed. |
| TPS54202DRCT | 2A output, 4.5–28V input, 500 kHz, synchronous buck, QFN-10 package | Wider input range, higher efficiency, smaller size - different pinout and control architecture | Choose for space-constrained designs needing >0.5A or synchronous rectification; not drop-in. |
Compared with LM2574HVN-12/NOPB, LM2576HVS-12 delivers triple the current but requires larger magnetics and lacks DIP-8 compatibility, while TPS54202DRCT offers modern integration and efficiency at the cost of layout redesign and absence of through-hole mounting.
Availability
LM2574HVN-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, test equipment, and legacy system retrofits requiring stable component supply with long lifecycle support.
Supply support for LM2574HVN-12/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 SIMPLE SWITCHER™ product line as a portfolio of easy-to-use, highly reliable DC-DC regulators.
The LM2574 series was designed specifically for engineers needing robust, low-component-count buck regulators for industrial, automotive, and instrumentation applications where simplicity, thermal resilience, and long-term availability are critical.
FAQ
What is the maximum input voltage rating for LM2574HVN-12/NOPB?
The LM2574HVN-12/NOPB has a maximum input voltage rating of 60V, as specified in the Absolute Maximum Ratings table. This HV variant supports operation from 4.75V up to 60V, making it suitable for 48V telecom systems, 36V industrial buses, and automotive applications with load-dump transients. Exceeding 60V may cause permanent damage.
Does LM2574HVN-12/NOPB require external feedback resistors?
No, LM2574HVN-12/NOPB does not require external feedback resistors. As a fixed-output version, its feedback pin (Pin 1) is internally connected to the 12V output. The device uses an internal voltage divider to compare output voltage against the 1.23V reference, eliminating external resistor networks and associated drift or layout sensitivity.
What package type is used for LM2574HVN-12/NOPB?
LM2574HVN-12/NOPB uses an 8-pin plastic dual in-line package (DIP) with NS package code N08A. It features four ground pins (Pins 2, 4, 5, 8) and an exposed thermal pad on the bottom that must be soldered to a large PCB copper area for optimal thermal performance and electrical grounding.
Can LM2574HVN-12/NOPB be shut down remotely?
Yes, LM2574HVN-12/NOPB supports remote shutdown via its ON/OFF pin (Pin 7). Applying a logic-low voltage (<1.0V) enables regulation; applying logic-high (>2.2V) disables the output and reduces quiescent current to 50 µA typical. This feature enables system-level power sequencing and low-power sleep modes without removing input voltage.
What is the typical efficiency of LM2574HVN-12/NOPB at full load?
The typical efficiency of LM2574HVN-12/NOPB is 88% at VIN = 15V and IOUT = 0.5A, as measured in the Electrical Characteristics table. Efficiency varies with input voltage and load - e.g., 77% at VIN = 12V for 5V versions, but LM2574HVN-12/NOPB achieves peak efficiency near its nominal 12V output due to optimized internal switch characteristics.
LM2574HVN-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2574HVN-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVN-12/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-12/NOPB reliable?
The price and inventory of LM2574HVN-12/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-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVN-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVN-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVN-12/NOPB?
LM2574HVN-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVN-12/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-12/NOPB?
For technical support, including LM2574HVN-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVN-12/NOPB requirements.
6.How does Aetrix verify that LM2574HVN-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVN-12/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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVN-12/NOPB?
All LM2574HVN-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVN-12/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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVN-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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