12V (8-24V) To 5V 3A DC-DC Waterproof Step-Down Converter Power Supply Module F23J5V3A4S
This miniature waterproof DC-DC step-down converter takes an 8–24V DC input (nominally 12V) and delivers a clean, regulated 5V output at up to 3A (15W). It's a straightforward, epoxy-sealed way to power 5V electronics -- dash cams, USB accessories, microcontroller boards, and more -- directly from a 12V battery, vehicle system, or wall adapter.
⚠️ Before You Buy: Your 12V input supply must be able to provide at least 15W of power (roughly 1.25A at 12V) to deliver the full rated 5V/3A output. If the input supply can't keep up, the output voltage will sag below 5V. See our free User Guide on our support website for full wiring diagrams, mechanical drawings, 3D STEP files, and power-budget calculations.
⚡ Key Features
- Regulated 5V Output -- Clean, stable power for 5V-logic devices, USB accessories, and sensors
- Wide Input Range -- Accepts 8–24V DC, ideal for 12V nominal systems
- Waterproof Housing -- Epoxy-sealed for outdoor, automotive, and marine use
- High Efficiency -- Greater than 96% efficient, minimal heat generation
- Built-In Protection -- Overload, over-current, over-voltage, and low-voltage protection with auto-recovery
📐 Specifications
| Envistia P/N |
F23J5V3A4S |
| Input Voltage Range |
8–24V DC |
| Nominal Input |
12V DC |
| Output Voltage |
5V |
| Max Output Current |
3A |
| Max Output Power |
15W |
| Efficiency |
>96% |
| Operating Temperature |
-40°C to +70°C |
| Size (L × W × H) |
Approx. 38 × 27 × 23 mm (1.50 × 1.06 × 0.91 inches) (52 mm / 2.05 inches with mounting tabs) |
| Weight |
Approx. 30g |
| Input & Output Wire Length |
Approx. 12cm (4.7 inches) per lead |
| Input & Output Wire Size |
0.5mm² cross-sectional area, equivalent to ~20 AWG |
| Case Color |
White |
| Housing |
Epoxy-sealed, waterproof |
🔌 Wiring
Two pairs of wires -- no pins or connectors needed. Simply splice, solder, or crimp into your circuit:
- Red (input side) -- Input +V, connect to your 12V positive supply
- Black (input side) -- Input Ground, connect to your 12V negative/ground
- Red (output side) -- Output +V, connect to your load's positive terminal
- Yellow (output side) -- Output Ground, connect to your load's negative/ground terminal
📦 What's in the Box
- 1× 12V to 5V 3A Mini DC-DC Step-Down Converter (F23J5V3A4S)
🎯 Typical Applications
- Dash cams and USB accessories -- Convert 12V vehicle power down to the 5V that most USB-powered dash cams and gadgets expect
- Microcontroller and hobby electronics projects -- Cleanly power Arduino, Raspberry Pi, or similar 5V boards from a 12V supply
- Networking and low-voltage equipment -- Power 5V switches, routers, or modules from a 12V battery or solar setup
- Retrofit and alarm system power -- Step down 12V power to run legacy 5V equipment without rewiring the whole system
⚠️ Important Notes
- Double-check polarity before powering up -- reversing input or output wires can damage the converter or your device.
- Your 12V input supply must be able to provide at least 15W (the converter cannot generate extra power beyond what the input source supplies).
- This is a constant-voltage (CV) converter, not a constant-current (CC) converter -- it regulates to 5V and supplies whatever current your load draws, up to 3A maximum.
🏪 About Envistia Mall
Envistia Mall is a US-based electronics retailer specializing in development boards, sensors, modules, and components for makers, engineers, and educators. We ship from the United States with fast handling times. Product documentation and technical support are available at our dedicated support site.
📦 Fast Free US Shipping | 🔄 Hassle-Free Returns | 📧 Responsive Customer Support
Visit our eBay Store for the full line of F23JxVxA4S series 12V DC-DC step-down converters (3.3V, 6V, and 9V output models), plus other DC/DC converters, sensors, and connectors for your 12V projects.
