STMicroelectronics L4971D013TR Step-Down Regulator Overview
The STMicroelectronics L4971D013TR is a robust, fixed-output step-down (buck) voltage regulator engineered for high-reliability power delivery in industrial automation, energy management, and test equipment applications. Designed to convert 4.5V?C35V input voltages to a precise 1.3V output-critical for powering low-voltage microcontrollers, precision ADCs, and multi-sensor arrays-it integrates a low-resistance power switch, overcurrent protection, and thermal shutdown into a durable TO220 through-hole package. With an operating temperature range of -40??C to +125??C, it maintains consistent performance in extreme conditions, from freezing outdoor solar installations to hot factory control cabinets. This makes it a top choice for B2B engineers prioritizing durability, current capacity, and voltage stability in 24/7 operating systems like assembly lines, solar inverters, or industrial data loggers.
As a product from STMicroelectronics-a global leader in semiconductor innovation with decades of expertise in industrial and energy-grade power management-the regulator meets strict quality standards (including RoHS 2 certification) and undergoes rigorous testing for long-term reliability. Senior engineers at a leading industrial automation firm endorse it, noting: ??The L4971D013TR??s 2.5A output and TO220 package have kept our 24V sensor arrays running nonstop for 4 years, with zero regulator failures-something our old 1.5A SOT223 regulator couldn??t match.?? For more trusted industrial ICs and high-reliability power solutions, visit IC 製造商.
暢銷產品
Technical Parameters of L4971D013TR
| 參數 | 規格 |
|---|---|
| 功能 | 固定輸出降壓 (降壓) 電壓穩壓器 |
| 輸入電壓範圍 | 4.5V to 35V |
| 固定輸出電壓 | 1.3V (??2% accuracy at 25??C) |
| 最大連續輸出電流 | 2.5A |
| 峰值輸出電流 | 3A (short-duration, ??80ms) |
| 切換頻率 | 200kHz (fixed) |
| 包裝類型 | TO220 (3-pin Through-Hole Package with heatsink compatibility) |
| 包裝尺寸 | 10.16mm x 6.35mm x 4.57mm (standard TO220) |
| 操作溫度範圍 | -40°C 至 +125°C |
| 峰值效率 | 91% (typical, 12V input, 1.3V output, 1.5A load) |
| 靜態電流 | 6mA (typical, no-load condition) |
| 輸出紋波 | ??40mV峰對峰 (typical, 1.3V output, 1A load) |
| 整合功能 | 低 RDS(on) power switch, overcurrent protection (3A typical), thermal shutdown, soft start |
| 合規性 | 符合 RoHS 2 標準 |
Key Technical Features of L4971D013TR
- Wide 4.5V?C35V input range, eliminating external voltage clamping and handling spikes (e.g., 24V industrial supplies spiking to 32V during motor startup). An energy system engineer reported this feature ??reduced voltage-related inverter failures by 100% in our test fleet.??
- 2.5A continuous output current, delivering enough power for multi-sensor arrays (5x 0.5A temperature/pressure sensors) without parallel regulators. A factory automation designer noted ??one regulator powers our entire sensor suite, cutting component count by 50% vs. using two 1.25A regulators.??
- TO220 package with heatsink compatibility, improving heat dissipation by 30% vs. surface-mount alternatives like SOT223. Industrial power supply engineers confirm ??adding a heatsink keeps the regulator 20??C cooler at 2.5A output, even in 65??C factory enclosures.??
- ??2% output voltage accuracy, ensuring stable power for calibration-sensitive components (e.g., industrial data loggers). A test equipment maker shared ??this accuracy reduced measurement errors in our loggers by 65%, meeting our clients?? ISO 9001 quality requirements.??
- Built-in soft start, limiting inrush current to 1A and protecting downstream components (e.g., microcontrollers) from power-up damage. An industrial control panel designer noted ??this feature eliminated 92% of microcontroller failures during system power-on cycles.??
Advantages of L4971D013TR Over Alternative Solutions
Compared to lower-current regulators (??1.5A), narrow-input-range models (??24V), or surface-mount packages with poor heat dissipation, the L4971D013TR delivers three critical benefits for B2B high-reliability designs-backed by real customer feedback:
First, its 2.5A output outperforms lower-current alternatives. Low-current 1.5A regulators force engineers to use two chips for 2A+ loads (e.g., 5x 0.5A sensors), adding cost, PCB space, and failure points. The L4971D013TR??s 2.5A capacity handles these loads with one device. A senior industrial engineer explained: ??We used two 1.5A regulators for our 2.2A sensor array; switching to the L4971D013TR cut PCB space by 40% and reduced our Bill of Materials cost by 30%. Fewer components also mean fewer potential failures in 24/7 factory operations.??
精選產品
Second, its 35V input range eliminates narrow-range limitations. Regulators with ??24V max input fail in industrial systems where 24V supplies spike to 32V during motor startup or solar inverter load changes. The L4971D013TR??s 35V tolerance handles these spikes effortlessly. A solar energy designer confirmed ??our old 24V-input regulator failed 9% of the time during inverter load shifts; the L4971D013TR has zero failures, even with 33V spikes. This reliability cut our maintenance calls by 88%.??
Third, its TO220 package outperforms surface-mount alternatives. Surface-mount regulators (e.g., SOT223) overheat at 2A+ output, causing thermal shutdown and costly system downtime. The L4971D013TR??s TO220 package with heatsink compatibility dissipates heat more effectively-per STMicroelectronics testing, it reduces junction temperature by 25??C at 2.5A vs. SOT223. A factory maintenance manager shared ??our old surface-mount regulator shut down 2x weekly due to overheating; the L4971D013TR runs 24/7 with a small heatsink-saving 8+ hours of downtime monthly and boosting production efficiency by 7%.??
聯絡我們
Typical Applications of L4971D013TR
The L4971D013TR is engineered to solve high-current, harsh-environment power regulation challenges-with proven success in these key B2B use cases:
- Industrial Automation (Sensor Arrays): Converting 24V factory power to 1.3V for 5x 0.5A pressure/temperature sensors. A factory operator confirmed ??sensors run continuously for 4 years with no power downtime, vs. 8-month failures with our old 1.5A regulator.??
- Energy and Power (Solar Inverters): Regulating 24V solar panel power to 1.3V for inverter control circuits. A renewable energy firm noted ??the 35V input tolerance handles load spike, and 2.5A output powers peak control loads without voltage drops.??
- 測試與量測 (可攜式資料記錄器): Converting 12V bench power to 1.3V for precision ADCs. A test equipment maker reported ??the ??2% output accuracy reduced data logger errors by 65%, meeting our clients?? strict calibration standards.??
- Security and Surveillance (High-Power Cameras): Regulating 12V POE power to 1.3V for 4K camera processors. A security firm confirmed ??the regulator??s 91% efficiency cuts heat in camera housings, and 2.5A output supports continuous 4K recording.??
- Home Appliances (Smart HVAC Controls): Step-down 24V HVAC power to 1.3V for control board microcontrollers. A home tech brand shared ??the TO220 package handles HVAC cabinet heat, and 2.5A output supports fan and sensor loads.??
常見問題 (FAQ)
Why is the 4.5V?C35V input range important for solar inverters?
Solar inverters experience input voltage spikes (24V systems spiking to 32V) during load changes or cloud cover shifts. The L4971D013TR??s 35V range handles these spikes, ensuring stable 1.3V output for control circuits. A solar engineer noted ??our old 24V-input regulator failed 9% of the time during spikes; this one works reliably, cutting maintenance calls by 88% and eliminating external voltage clamps.??
How does the 2.5A output current benefit industrial sensor arrays?
Industrial sensor arrays (e.g., 5x 0.5A pressure sensors) require 2.5A total current-more than lower-current 1.5A regulators can deliver. The L4971D013TR??s 2.5A output powers these arrays with one chip, avoiding parallel regulators. A factory designer shared ??we used two 1.5A regulators before; now one L4971D013TR works, cutting PCB space by 40% and component cost by 30%-reducing wiring and failure risks in 24/7 operations.??
Can the L4971D013TR operate in high-temperature factory enclosures?
Yes. Its -40??C to +125??C operating range and TO220 package with heatsink handle 65??C factory enclosures. The heatsink boosts dissipation by 30%, keeping the regulator 80??C (well below 125??C max). A maintenance manager confirmed ??our factory runs at 60??C, and the regulator stays cool with a small heatsink-zero thermal shutdowns in 3 years, minimizing downtime.??
What value does ??2% output accuracy add for test equipment?
Test equipment like data loggers uses ADCs sensitive to voltage changes-even 5% accuracy variations cause measurement errors. The L4971D013TR??s ??2% accuracy ensures stable power, cutting errors. A test engineer noted ??our old ??5% regulator caused 15% data error; this one cuts it to 4.5%, meeting ISO 9001. No more manual calibration saves 2 hours weekly per device.??
How does overcurrent protection safeguard industrial systems?
Industrial systems face overloads (e.g., a sensor short-circuiting to 24V power) that damage regulators and components. The L4971D013TR??s 3A overcurrent protection shuts down temporarily, preventing damage. An industrial sensor maker shared ??before this regulator, short circuits destroyed 12 sensors monthly; now the regulator recovers, saving $9,600 annually in replacement parts.??
