📋 Overview
This miniature DC-DC step-down converter takes an 8–24V DC input (nominally 12V) and delivers a clean, regulated 3.3V DC output at up to 3A (9W maximum). It's a waterproof, straightforward way to power 3.3V electronics — sensors, microcontrollers, cameras, 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 3.3V output — Clean, stable power for 3.3V-logic devices 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 Model Number | F23J3V3A4S |
| Input Voltage Range | 8–24V DC |
| Nominal Input | 12V DC |
| Output Voltage | 3.3V (+2%/-10%) |
| Max Output Current | 3A |
| Max Output Power | 9W |
| Approx. Max Input Current (at full load, 12V in) | ~0.75A |
| 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 3.3V. See the full User Guide linked below for wiring diagrams and a detailed power-budget walkthrough.
📦 What's in the Box
- 1× 12V to 3.3V 3A Mini DC-DC Step-Down Converter (F23J3V3A4S)
🎯 Applications
- Sensor and remote monitoring power — Power 3.3V sensors, dataloggers, or wireless modules from a 12V battery or solar setup
- Microcontroller projects — Cleanly power 3.3V-logic boards from a 12V supply
- Camera and dash accessory power — Step down 12V vehicle or DC power to 3.3V for small electronics
- Retrofit and OEM replacement power — Replace failed linear regulators with an efficient, waterproof drop-in solution
📄 Documentation & Resources
🛒 Other Models in the F23JxVxA4S Series
Sold and supported by . Ships from the USA. For wiring diagrams, sample code, Mechanical & STEP files, 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.
Envistia P/N: F23J3V3A4S
