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onsemi LM2576D2TR4-012G
- Part No.:
- LM2576D2TR4-012G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2TR4-012G.pdf
- Description:
- IC REG BUCK 12V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
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Product details
Overview
LM2576D2TR4-012G from onsemi is a monolithic 3.0 A, 12 V fixed-output step-down (buck) switching regulator in D2PAK package. It operates from 7.0 V to 40 V input, delivers ±4% output voltage accuracy over line/load/temperature, features 52 kHz fixed-frequency 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 LM2576D2TR4-012G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 12 V fixed output with ±4% tolerance, D2PAK thermal performance (RJC = 5.0 °C/W), 80 µA standby quiescent current, and compatibility with standard off-the-shelf 100 µH inductors.
Technical Context
The LM2576D2TR4-012G integrates a 3.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and thermal/current protection circuitry. Its fixed 12 V output eliminates external feedback resistors, simplifying layout and improving stability versus adjustable variants.
It uses voltage-mode PWM control with fixed frequency and variable duty cycle (up to 98%), enabling predictable EMI filtering. Under overload or short-circuit, oscillator frequency drops to ~18 kHz to reduce average power dissipation while maintaining protection integrity.
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 - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Output Current | 3.0 A continuous - supports high-current loads like motor drivers or FPGA core supplies without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates wide-input industrial 24 V systems and automotive battery variations (cold crank to load dump). |
| Switching Frequency | 52 kHz (±10% over temperature) - enables use of low-cost, high-saturation-current inductors and reduces EMI filter size vs. higher-frequency alternatives. |
| Efficiency | 88% at 15 VIN, 3.0 A load - minimizes thermal rise and eliminates need for heatsink in many applications. |
| Standby Quiescent Current | 80 µA typical at 25 °C when ON/OFF pin ≥2.4 V - enables ultra-low-power shutdown mode for battery-backed systems. |
| Thermal Resistance | Junction-to-case RJC = 5.0 °C/W - allows direct heatsink mounting via exposed tab (Pin 3) for reliable 3 A operation at elevated ambient temperatures. |
Pinout & Package
D2PAK (TO-263) package, case 936A, with heatsink surface electrically connected to Pin 3 (GND). Exposed metal tab serves as primary thermal path and must be soldered to PCB copper pour for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR aluminum electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤2.0 V at 3 A ensures low conduction loss; PCB copper area must be minimized to reduce noise coupling. |
| 3 - GND | Circuit ground / heatsink connection | Common return for all internal circuits and thermal interface; must be connected to large low-impedance ground plane for EMI and thermal control. |
| 4 - Feedback | Regulation sense input | Internally tied to 12 V divider; unused in fixed-output version - leave unconnected per datasheet guidance. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (≥2.4 V) disables regulator and reduces IQ to 80 µA; logic-low (<0.8 V) or open enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external resistor network, reducing BOM count, layout sensitivity, and long-term drift versus adjustable versions. |
| Cycle-by-cycle current limit | Peak current limit of 4.2–7.5 A protects against short-circuit and inrush faults without latch-up or external sensing components. |
| Thermal shutdown | Activates at TJ = 150 °C and holds until junction cools by ≥15 °C - prevents permanent damage during sustained overload or poor heatsinking. |
| Low-ESR capacitor support | Stable with standard aluminum electrolytics (e.g., 100 µF input, 1000 µF output); no requirement for expensive polymer or tantalum capacitors. |
| Pb-free and MSL-1 packaging | Compatible with standard reflow profiles; no moisture bake required prior to assembly - simplifies manufacturing logistics. |
Applications
| Industrial Power Supply | Embedded System DC-DC Conversion |
|---|---|
|
Use Scenario: 24 V factory bus powering PLC I/O modules requiring clean, regulated 12 V. IC Role / Device Role / Timing Role: Primary buck converter delivering 3 A at 12 V with line/load regulation <±0.5%. Use Value: Replaces linear regulators to eliminate >15 W heat dissipation, enabling compact sealed enclosures without forced air cooling. |
Use Scenario: On-board 12 V rail generation for FPGA-based test equipment with tight space constraints. IC Role / Device Role / Timing Role: Fixed-output switching regulator operating at 52 kHz to simplify EMI filter design. Use Value: Achieves 88% efficiency at full load, reducing board-level temperature rise and improving system reliability over 10-year field life. |
| Automotive Subsystem Power | Legacy Equipment Retrofit |
|
Use Scenario: Powering 12 V sensors and CAN transceivers in commercial vehicle ECUs with 9–36 V battery input. IC Role / Device Role / Timing Role: Input-tolerant buck regulator with 40 V max rating and thermal shutdown for engine-bay environments. Use Value: Withstands load-dump transients up to 40 V and maintains regulation across cold-crank dips to 6.5 V - no external TVS or LDO pre-regulator needed. |
Use Scenario: Upgrading aging linear power supplies in medical diagnostic instruments to improve energy efficiency and thermal margin. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 7812 linear regulators using existing 12 V output filter footprint. Use Value: Delivers same 12 V output with 3× higher current capability and 75% lower power loss - extends equipment service life without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-12 | TO-220 package (Case 314B), RJA = 65 °C/W vs. D2PAK's 70 °C/W; identical electrical specs and pinout. | Requires mechanical heatsink mounting; less suitable for high-density SMT layouts or automated assembly. | Select LM2576T-12 only when through-hole assembly or legacy TO-220 heatsink infrastructure is mandated. |
| MP1584EN-LF-Z | 4 A rated, 1.5 MHz switching, adjustable output; smaller solution size but requires external feedback resistors and has higher EMI. | Not pin-compatible; demands redesigned PCB layout, new inductor, and tighter EMI filtering for medical/industrial compliance. | Choose MP1584EN-LF-Z only when higher efficiency above 1 A or compact footprint outweighs qualification effort and fixed-output simplicity. |
Compared with LM2576T-12, the LM2576D2TR4-012G offers superior thermal resistance to heatsink (RJC = 5.0 °C/W) and SMT manufacturability; versus MP1584EN-LF-Z, it trades higher frequency for proven 52 kHz EMI behavior and zero-resistor 12 V output - critical for cost-sensitive, high-reliability industrial retrofits.
Availability
LM2576D2TR4-012G is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and automotive subsystem power requiring stable component supply, long lifecycle support, and qualified sourcing.
Supply support for LM2576D2TR4-012G 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 management, signal processing, and sensor technologies for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed as a robust, low-component-count buck regulator family for cost-sensitive industrial and embedded applications where reliability, thermal resilience, and ease of qualification outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2576D2TR4-012G?
The LM2576D2TR4-012G has an absolute maximum input voltage rating of 45 V, with recommended operating range of 7.0 V to 40 V. Operation above 40 V risks exceeding internal transistor breakdown limits and is not guaranteed per datasheet specifications. The device sustains brief load-dump transients up to 40 V without degradation when properly heatsinked.
Does LM2576D2TR4-012G require external feedback resistors?
No. The LM2576D2TR4-012G is a fixed 12 V output variant - its internal resistor divider sets the output voltage, eliminating the need for external R1/R2 components. Pin 4 (Feedback) is internally connected and must remain unconnected in PCB layout per datasheet guidance to avoid regulation errors.
What thermal performance can be expected from LM2576D2TR4-012G in D2PAK package?
The LM2576D2TR4-012G in D2PAK (Case 936A) has RJC = 5.0 °C/W and RJA = 70 °C/W with standard 2 oz copper. When mounted to a 4 cm² thermal pad with 2 thermal vias, it delivers full 3.0 A output continuously at +70 °C ambient - verified in onsemi's thermal characterization report Rev. 11.
Can LM2576D2TR4-012G be synchronized to an external clock?
No. The LM2576D2TR4-012G uses a fixed 52 kHz internal oscillator with no synchronization input. Frequency variation is ±10% over temperature (42–63 kHz), and the oscillator cannot be overridden or locked to external timing - unlike modern synchronous buck controllers.
Is LM2576D2TR4-012G RoHS compliant and lead-free?
Yes. The LM2576D2TR4-012G is manufactured in Pb-free (lead-free) packaging per J-STD-609, with Moisture Sensitivity Level (MSL) 1 - meaning it can be stored indefinitely at ambient conditions and withstand standard lead-free reflow profiles without baking.
LM2576D2TR4-012G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2576D2TR4-012G FAQ
1.How can I place an order for LM2576D2TR4-012G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2TR4-012G 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 LM2576D2TR4-012G reliable?
The price and inventory of LM2576D2TR4-012G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2TR4-012G is usually 5 days.
3.What payment methods are accepted for LM2576D2TR4-012G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2TR4-012G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2TR4-012G?
LM2576D2TR4-012G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2TR4-012G 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 LM2576D2TR4-012G?
For technical support, including LM2576D2TR4-012G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2TR4-012G requirements.
6.How does Aetrix verify that LM2576D2TR4-012G is sourced from the original manufacturer or authorized distributors?
All LM2576D2TR4-012G 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 LM2576D2TR4-012G meets industry standards.
7.What is the process for return or replacement of LM2576D2TR4-012G?
All LM2576D2TR4-012G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2TR4-012G, 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 LM2576D2TR4-012G part is unused and in its original packaging.
Return procedure for LM2576D2TR4-012G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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