SDS05W / SDH05W 5W Isolated DC/DC Converters

The series comes in two wide-range input categories: one accepts 9 V to 36 V DC and another covers 18 V to 75 V DC. This 4:1 input range means each converter can handle substantial variations or different standard bus voltages (for example, the 9–36 V range covers nominal 12 V and 24 V supplies, while 18–75 V covers 24 V and 48 V systems) without any adjustment.

Single-output models are available for 3.3 V, 5 V, 9 V, 12 V, 15 V, or 24 V DC outputs. Dual-output models provide symmetrical ±5 V, ±12 V, or ±15 V outputs (with a common 0 V). Each converter is rated for about 5 W output power in total. For example, the 5 V single-output version can provide up to 1 A (5 V × 1 A = 5 W). Higher-voltage outputs supply proportionally lower current (e.g. the 24 V model gives ~0.21 A for ~5 W). Dual output units split the 5 W between the positive and negative rails (for instance, ±15 V can deliver roughly 0.17 A on each rail). All outputs are fully regulated, maintaining their set voltage across load and input variations.

No minimum load is required – each SDS05W/SDH05W converter remains stable and within regulation from 0% load up to full load. This is convenient for systems that have very light loads or idle periods, as you won’t need any dummy resistors to meet a load requirement. Additionally, the modules feature continuous short-circuit protection. If the output is shorted or overloaded, the converter will limit the current (or enter a safe-hiccup mode), preventing damage. Once the fault is removed, the converter automatically resumes normal operation.

Standard models provide 1600 V DC isolation between input and output. There are also "H" suffix versions with 3000 V DC isolation for applications that need extra-high isolation. This high isolation helps ensure safety and reduces electrical noise coupling between circuits. In terms of safety standards, the series is tested to meet IEC, UL and EN 62368-1 (the safety standard for IT and AV equipment). The converters are CE marked, and they also comply with RoHS II and REACH directives. All of this means they meet internationally recognised safety and environmental criteria, which can simplify compliance for your end product.

The electrical specifications are identical between SDS05W and SDH05W models of the same variant – the only difference is the package and mounting style. SDS05W modules are in an SMD8 package, designed for surface-mount soldering directly onto the PCB (suitable for reflow soldering). SDH05W modules are in a DIP8 thru-hole package with pins, intended for through-hole mounting (ideal for manual assembly, socket use, or when a taller profile is acceptable). In short, SDS05W is for compact, automated assembly, whereas SDH05W is for traditional or prototyping-friendly assembly. You can choose whichever fits your manufacturing process; performance will be the same.

Yes. Each converter includes a remote on/off control pin (sometimes labeled CTRL or EN) to enable or disable the output on demand. By using this pin, you can enable or disable the converter’s output electronically. For example, pulling the control pin to a specified logic level (refer to the datasheet for the exact polarity and threshold) will turn the output on or off. This feature is very useful for power sequencing (bringing up different supply rails in order) or for power saving — you can shut down the converter when its output isn’t needed, reducing standby power consumption in your system.

The SDS05W/SDH05W converters are quite efficient for their size. Typical efficiency ranges from around 76% (for the 3.3 V output models) up to about 83–84% (for the 12 V, 15 V, and ±15 V models) at full load. The 5 V and 9 V units tend to fall in the ~80–82% range. In terms of temperature, these modules are designed for a broad –40 °C to +85 °C ambient operating range. At higher ambient temperatures or full-power operation, you may need some airflow or derating (check the datasheet’s derating curve), but generally they can handle up to 85 °C without issue. The converters are encapsulated in a thermally efficient plastic case, and their internal design manages heat well for typical conditions.

The SDS05W/SDH05W series is engineered with low EMI in mind, but like most DC-DC converters, you will likely need to add some external components to meet stringent EMC standards (especially EN 55032 Class B for emissions). The manufacturer’s EMC application note provides guidelines: typically, adding an input LC filter (inductors and capacitors) and proper decoupling capacitors on the input/output will significantly attenuate switching noise. Also, maintaining good PCB layout practices – such as short connections, a proper ground plane, and placing filter components close to the module – will help. By following the recommended filter network from the EMC considerations document, these converters can satisfy EMI requirements for most applications.

The output ripple/noise is relatively low for these modules. At full load, you can expect on the order of 50 to 100 mV_pp of ripple on the output, depending on the model and conditions. For example, the 5 V output unit typically has around 75 mV_pp ripple at nominal input and full load (with the recommended output capacitor in place). Higher-voltage outputs like 12 V or 15 V often show ripple on the lower end of that range (tens of mV). Using a good quality low-ESR output capacitor and following the layout recommendations will ensure the ripple remains low. If needed, you can always add an external LC filter or an additional output capacitor to further smooth the output for especially noise-sensitive analog or RF circuits.