12V (8-24V) To 5V 3A DC-DC Waterproof Step-Down Converter Power Supply Module F23J5V3A4S
12V (8-24V) To 5V 3A DC-DC Waterproof Step-Down Converter Power Supply Module F23J5V3A4S
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📋 Overview
This miniature DC-DC step-down converter takes an 8–24V DC input (nominally 12V) and delivers a clean, regulated 5V DC output at up to 3A (15W maximum). It's a waterproof, straightforward way to power 5V electronics — dash cams, USB-powered devices, microcontroller boards, and more — directly from a 12V battery, vehicle system, or wall adapter.
Built as a non-isolated buck (step-down) converter, it operates at over 96% efficiency, so very little power is wasted as heat even under full load. The epoxy-sealed housing makes it safe for outdoor, automotive, or otherwise exposed installations.
⭐ 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 with voltage sag or charging spikes
- Epoxy-sealed, waterproof housing — Safe 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 automatic recovery
- Compact and lightweight — Easy to tuck into enclosures, dashboards, or inline wiring runs
📊 Specifications
| Specification | Value |
|---|---|
| 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 |
| Approx. Max Input Current (at full load, 12V in) | ~1.25A |
| Quiescent Current (no load) | <10mA |
| 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) L × W × H (52 mm / 2.05 inches overall length including 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 & Connections
Two pairs of wires — no pins or connectors needed. Simply splice, solder, or crimp into your circuit.
| Wire Color | Function |
|---|---|
| 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 |
Wire gauge: all leads are 0.5mm² cross-sectional area (20 AWG).
⚠️ Important: Double-check polarity before powering up. Reversing the input wires can damage the converter, and reversing the output wires can damage your connected device.
⚠️ Important Notes
Your 12V input power source must be able to supply at least as much power as your load will draw from the output, divided by the converter's efficiency (~96%). If the input source can't keep up, the output voltage will fold back (sag) rather than deliver the full 5V. See the full User Guide linked below for wiring diagrams and a detailed power-budget walkthrough.
📦 What's in the Box
- 1× 12V to 5V 3A Mini DC-DC Step-Down Converter (F23J5V3A4S)
🎯 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
📄 Documentation & Resources
- User Guide — Wiring, specifications, Mechanical & STEP Files, power-budget calculations & troubleshooting
- All Buck Step-Down DC/DC Converter User Guides
🛒 Other Models in the F23JxVxA4S Series
- 12V to 3.3V 3A DC-DC Converter (F23J3V3A4S)
- 12V to 6V 2.5A DC-DC Converter (F23J6V2.5A4S)
- 12V to 9V 1.7A DC-DC Converter (F23J9V1.7A4S)
Sold and supported by Envistia Mall. Ships from the USA. For wiring diagrams, sample code, and troubleshooting, see the User Guide tab on this product page. The manufacturer and Envistia LLC (dba Envistia Mall) are not responsible for any damages or losses resulting from the use of this product. Always follow proper electrical safety practices when working with electronic components. Specifications are based on manufacturer data and are subject to change without notice.
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- 5 stars: 15 (79%)
- 4 stars: 2 (11%)
- 3 stars: 2 (11%)
- 2 stars: 0 (0%)
- 1 star: 0 (0%)
very good product.
I used this for a hard wire dash cam on 2 of my vehicles. Haven’t had an issue and it’s been almost a year. Provides enough power for the camera. They’re built well and great for the price.
I hadn’t realized 12v wasn’t useable by a mini USB powered device. I wanted to hard wire the dash cam into my vehicle instead of using the cigarette lighter plug. I wired it to 12v at the car’s fuse box but then the camera wouldn’t turn on. Only then did I learn USB uses 5v. This DC/DC converter takes your 12v supply and outputs 5v, exactly what the camera is looking for. Great product, works perfectly.
I got this little guy for to run a 5V Netgear unmanaged switch from a 12V source. It does its job, is sealed more or less, protected from moisture. So far it has worked great. The switch draws up to 700mA from the 5V output. A small piece of double-stick tape holds it on the scope mount.
Worked as intended. Wire ends came stripped and tinned. That really sped up the installation process.
I used this to hardwire a USB-powered dash cam versus using the cigarette lighter port and USB block. Works perfect.
Converts 12 VAC to 5 VDC, but has an annoying flicker.
Put a network box on the boat
For my application it worked great.
Very easy to install and quite light and easy to mount. The only caveat was that there were no instructions, but other than that the item works as intended.
Easy to install, works as described
Power Converter works well. Used for a college engineering project (projectile turret) to get a 5V line from the 12V line to power our micro and servos. Measuring on the scope there is little to no voltage ripple on the output even with dynamic loads due to motor/servo switching on an off. Tested up to 1.2A and worked great. Little bit on the pricier side, but is nice to just buy it and forget instead of trying to spec an inductor, build a control circuit and buck converter manually, quick and dirty plug and play solution great for prototyping.
I have been told and shown of some cheaper ways to install auto accessories but I didn't want electrical noise, ect. This is powering my drive camera in my Rubicon, well, one of them. So far so good. Freed up a usb port and made for clean hidden wiring.
I'm using this to power a USB hub from a 12 VDC battery for a remote telescope application and things are working very well.
I really like it, I just need it 5V in my RV, and it works perfect so far
I have a 12 volt power supply doing some home automation stuff and I wanted to power a wall mounted Amazon Fire tablet using the same power supply. This worked perfectly, I spliced the output of this into a hacked up USB cord and I've had no issues with it in the couple months I've owned it
I wired I. A Bluetooth receiver on a boat. I needed 5vdc and this was the solution. Unfortunately it has an audible whistle in the speakers that makes it useless.
nice product