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onsemi LM2576T-012
- Part No.:
- LM2576T-012
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-012.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,898
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Product details
Overview
LM2576T-012 from onsemi is a monolithic 3.0 A, 12 V fixed-output step-down (buck) switching regulator in TO-220 package. It operates from 7.0 V to 40 V input, delivers ±4% output voltage accuracy over line/load/temperature, features 52 kHz internal oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control - used in industrial power supplies and embedded DC-DC conversion.
For engineers reviewing the LM2576T-012 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 12 V fixed output with ±4% tolerance, 52 kHz fixed-frequency operation, thermal shutdown protection, and TO-220-5 package compatibility with heatsink mounting.
Technical Context
The LM2576T-012 integrates a 1.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and PWM comparator in a single monolithic IC. Its feedback loop uses an internal resistor divider for fixed 12 V output, eliminating external programming resistors.
It implements cycle-by-cycle peak current limiting (typ. 5.8 A at 25 °C), thermal shutdown at ~150 °C junction temperature, and low-power standby mode with 80 µA quiescent current when ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 15–40 V input |
| Max Output Current | Guaranteed 3.0 A continuous output current with proper heatsinking |
| Input Voltage Range | 7.0 V to 40 V DC - supports wide industrial input rails including 24 V systems |
| Oscillator Frequency | 52 kHz fixed (±10% over temp) - enables predictable EMI filtering and standard inductor selection |
| Efficiency | 88% typical at Vin = 15 V, IOUT = 3.0 A - reduces thermal load vs. linear regulators |
| Standby Current | 80 µA typical at 25 °C when ON/OFF pin ≥ 2.2 V - enables low-power system sleep modes |
| Thermal Protection | Internal thermal shutdown activates at ~150 °C junction temperature - prevents permanent damage under overload |
Pinout & Package
LM2576T-012 uses TO-220-5 package (Case 314D), with heatsink surface electrically connected to Pin 3 (GND). Pin 1 is input, Pin 2 is switch emitter/output, Pin 3 is ground, Pin 4 is feedback (internally tied for fixed 12 V version), and Pin 5 is TTL-compatible ON/OFF control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR input capacitor |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 12 V; saturation voltage ≤ 1.8 V at 3 A - impacts dropout and efficiency |
| 3 - GND | Circuit ground reference | Common return for input/output paths; heatsink tab connects here - critical for thermal management |
| 4 - Feedback | Regulation sense node | Internally connected to fixed 12 V divider - no external components required |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible: <1.2 V = ON, >2.2 V = OFF; draws ≤30 µA in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors - simplifies BOM and layout for dedicated 12 V rails |
| 3.0 A guaranteed output | Supports high-current loads without external pass devices - suitable for motor drivers and FPGA I/O rails |
| 52 kHz fixed frequency | Enables use of low-cost, standardized 100 µH inductors and predictable EMI filter design |
| TTL shutdown capability | Allows microcontroller-based power sequencing and system-level energy management |
| Thermal + current protection | Self-protecting under short-circuit, overload, or inadequate heatsinking - improves field reliability |
Applications
| Industrial Power Supply | Embedded System DC-DC |
|---|---|
Use Scenario: Converting 24 V factory bus to stable 12 V for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 12 V at up to 3.0 A with line/load regulation < ±1%. Use Value: Replaces linear regulators to eliminate heatsink requirements and reduce board space by >50%. | Use Scenario: Providing 12 V bias to analog front-ends and communication interfaces in edge IoT gateways. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with integrated protection - ensures clean, robust power under variable load transients. Use Value: Enables single-stage conversion from wide-input 9–36 V automotive or PoE-derived rails without external compensation. |
| Test Equipment Power | Legacy System Retrofit |
Use Scenario: Generating 12 V for benchtop DMMs and signal generators requiring low-noise, stable supply. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with 88% typical efficiency at full load - minimizes thermal drift in precision instruments. Use Value: Delivers consistent 12 V output across input variations (15–40 V), improving measurement repeatability. | Use Scenario: Upgrading aging 7812 linear regulators in legacy industrial controllers to improve thermal performance. IC Role / Device Role / Timing Role: Drop-in compatible buck replacement with identical 12 V output and TO-220 footprint - retains existing PCB layout. Use Value: Reduces power dissipation from >15 W (linear) to <3 W (switching) - eliminates forced-air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVT-12 | Higher input voltage rating (63 V max vs. 40 V); same 12 V output, 3 A, TO-220 package | Suitable for 48 V telecom or battery-powered systems where input surges exceed 40 V | Select when operating from >40 V nominal inputs or requiring surge immunity beyond 40 V |
| LM2596T-12 | Higher switching frequency (150 kHz), lower quiescent current (5 mA vs. 9 mA), same 12 V/3 A output | Better suited for compact designs needing smaller inductors/capacitors and lower no-load power | Prefer for space-constrained or battery-operated applications where 150 kHz EMI profile is acceptable |
Compared with LM2576HVT-12 and LM2596T-12, the LM2576T-012 offers proven 52 kHz stability and broad inductor availability but lacks extended input voltage range or higher-frequency miniaturization - choose it for cost-sensitive, thermally managed industrial 24 V-to-12 V conversion.
Availability
LM2576T-012 is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and test equipment requiring stable component supply with long lifecycle support.
Supply support for LM2576T-012 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed as a rugged, easy-to-use monolithic buck regulator family targeting cost-sensitive industrial and embedded applications where reliability, thermal resilience, and minimal external components are critical.
FAQ
What is the maximum input voltage for the LM2576T-012?
The LM2576T-012 supports a maximum input voltage of 40 V DC, with absolute maximum rating at 45 V. Operation above 40 V risks exceeding safe operating area limits and triggering thermal shutdown. For designs requiring >40 V input, consider the LM2576HVT-12 variant, which is rated for up to 63 V. Always maintain ≥2 V headroom between input and output to ensure stable regulation.
Does the LM2576T-012 require external feedback resistors?
No, the LM2576T-012 does not require external feedback resistors. As a fixed-output version, it integrates an internal resistor divider calibrated for 12 V output. Pin 4 (Feedback) is internally connected and must remain unconnected in standard operation. External resistors are only needed for the adjustable LM2576-ADJ variant.
Can the LM2576T-012 be used without a heatsink?
The LM2576T-012 can operate without an external heatsink at light loads (<500 mA) and low ambient temperatures (<40 °C), but full 3.0 A output requires heatsinking. With RJA = 65 °C/W and TJ(max) = 150 °C, even 1.5 A at 25 °C ambient exceeds safe junction temperature without heatsink. Use the TO-220 tab (Pin 3) as thermal interface - mount to copper area or metal chassis per datasheet layout guidelines.
What diode is recommended for use with the LM2576T-012?
The LM2576T-012 requires a Schottky catch diode rated ≥3.0 A average current and ≥40 V reverse voltage. The MBR360 (40 V, 3.0 A) is the manufacturer-recommended part per datasheet Table 1. Alternatives include SR304 or SB540. Avoid standard PN diodes due to slow recovery and increased switching losses - Schottky selection directly impacts efficiency and thermal performance of the LM2576T-012.
Is the LM2576T-012 RoHS compliant and lead-free?
Yes, the LM2576T-012 is offered in Pb-Free packages compliant with RoHS Directive 2011/65/EU. The "T" suffix denotes TO-220-5 package with lead-free finish. Moisture Sensitivity Level (MSL) is 1 - no floor life limitation or bake requirement prior to assembly. Confirm compliance via onsemi's official packaging drawings and material declarations for your specific date code batch.
LM2576T-012 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576T-012 FAQ
1.How can I place an order for LM2576T-012 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-012 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 LM2576T-012 reliable?
The price and inventory of LM2576T-012 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-012 is usually 5 days.
3.What payment methods are accepted for LM2576T-012?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-012 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-012?
LM2576T-012 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-012 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 LM2576T-012?
For technical support, including LM2576T-012 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-012 requirements.
6.How does Aetrix verify that LM2576T-012 is sourced from the original manufacturer or authorized distributors?
All LM2576T-012 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 LM2576T-012 meets industry standards.
7.What is the process for return or replacement of LM2576T-012?
All LM2576T-012 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-012, 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 LM2576T-012 part is unused and in its original packaging.
Return procedure for LM2576T-012:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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