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K78L05-500R3
K78L05-500R3
| Part Number | K78L05-500R3 |
|---|---|
| Manufacturer | Mornsun Power |
| Category | Power Supplies – Board Mount > DC DC Converters |
| Description | High-efficiency miniature switching regulator designed as a drop-in pin-compatible replacement for traditional LM78XX linear regulators, delivering a stable 5V, 500mA output without a heat sink. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The K78L05-500R3 is Mornsun’s synchronous step-down DC-DC module, pin-to-pin compatible with LM78L05 linear regulators for direct PCB replacement. It supports 6.5–36V wide input, outputs stable 5V/500mA, and reaches up to 92% conversion efficiency. Its low heat output eliminates heat sink demands, while the compact SIP3 package with low quiescent current suits industrial equipment, automotive devices, battery-powered instruments and distributed power systems.
Core Advantages
Pin-Compatible LM78L05 Retrofit Layout
Features a standardized 3-pin SIP configuration that directly mirrors traditional linear regulators, allowing immediate power efficiency upgrades on existing PCB designs without modifying trace paths.
Cool-Running High Efficiency (No Heat Sink Required)
Delivers peak conversion efficiency up to 92%, preventing structural board heating and bypassing the component cost, weight, and spatial overhead associated with standard thermal dissipation sinks.
Ultra-Wide Input Voltage Window
Operates reliably across a expansive 6.5V to 36V DC input range, easily handling severe supply rail voltage fluctuations, battery decay, and common industrial bus transients.
Hardwired Multi-Layer Signal Protection
Equipped with continuous short-circuit protection (SCP), over-current protection (OCP) and over-temperature protection (OTP) with automatic self-recovery capabilities, safeguarding both the converter and sensitive downstream components from overload faults.
Key Specifications
| Brand | Mornsun |
|---|---|
| Certifications | RoHS Compliant / Lead-Free / CE Marked / EN60950 Certified |
| Flame Retardant Grade | UL94 V-0 Plastic Housing |
| EDA/CAD Model | 3D STEP Models, Schematic Symbols & PCB Footprints available upon request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | SIP3 (10.7×7.2mm) |
| Mounting Type | Through-Hole Mounting |
| Surface Marking / Silkscreen | K78L05-500R3 Marking |
| Output Channel | Single Positive Output Channel |
| Input Voltage Range ($V_{IN}$) | 6.5 V to 36 V DC (Nominal 24 V DC system bus) |
| Output Voltage ($V_{OUT}$) | 5.0 V DC (Fixed, ±2% Accuracy) |
| Output Current ($I_{OUT}$) | 500 mA Maximum Continuous Current |
| Peak Conversion Efficiency | Up to 92% Optimized Dynamic Power Output |
| Typical Switching Frequency | 150 kHz |
| Line Regulation | ±0.5% Typical |
| Load Regulation | ±1% Typical |
| Ripple & Noise | 20 mVp-p Typical / 75 mVp-p Maximum (20 MHz Bandwidth) |
| Quiescent Current ($I_Q$) | 0.2 mA Typical (Ultra-low consumption standby baseline) |
| Built-in Protection | Short-Circuit SCP, Over-Current OCP, Over-Temperature OTP (Auto Recovery) |
| Operating Ambient Temperature | -40°C to +85°C (Industrial Class Temperature Envelope without derating) |
| Storage Temperature Range | -55°C to +125°C |
| Storage Humidity | 5% ~ 95% RH, Non-Condensing |
| Max Soldering Temp (10s) | 260°C Peak |
| Packaging Format | Anti-Static Tube Packaging |
Typical Applications
- Industrial Control Equipment, Programmable Logic Controllers (PLCs), and Smart Sensor Grids
- Battery-Powered Field Instruments, Handheld Telemetry Data Loggers, and Portable Electronics
- Automotive 12V / 24V Auxiliary Subsystems, Telematics Modules, and Cabin Light Controllers
- Distributed Power Architectures (DPA) and Point-of-Load (POL) Voltage Conversion Bricks
- Commercial Smart HVAC Controllers, Energy Meters, and Building Automation Access Nodes
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1-2 business days |
| Delivery Time | 3-7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet, sample requests, stock check, or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: Is your currently available stock of the K78L05-500R3 regulator 100% genuine and original?
A: Yes, we guarantee that all K78L05-500R3 modules in our warehouse are 100% brand-new, factory-original products directly from Mornsun. Every unit passes rigorous quality control protocols and is packaged in original anti-static tubes for physical pin preservation during transport.
Q2: Can the K78L05-500R3 directly replace an old LM78L05 linear regulator without changing the PCB?
A: Yes, it is designed for direct pin-to-pin, drop-in replacement. The pin orientation (Input, Ground, Output) aligns perfectly with standard TO-92 or SOT-89 linear configurations. Because it runs cool, you can safely remove the space previously reserved for heat sinks.
Q3: Does this switching regulator require external input or output capacitors to operate?
A: Official datasheet mandates external filter capacitors for stable long-term operation. A 10μF ceramic capacitor must be closely mounted to input and output pins, especially for long wiring harnesses, low-noise measurement circuits and automotive environments to suppress switching ripple.
Q4: How can our hardware team request official Mornsun datasheets, application briefs, or obtain high-volume corporate quotes?
A: Please complete the Quick Inquiry web form on this product presentation page with your requirements. Our dedicated application support desk will process your inquiry and forward full digital data assets within 24 hours.
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