The NKE0503DC is a 1 W isolated, unregulated DC-DC converter module from Murata Power Solutions, delivering a fixed 3.3 VDC output from a 5 VDC input in a miniature SIP (single in-line package) footprint. The converter provides 1000 VDC galvanic isolation between input and output, enabling noise decoupling and ground loop elimination in distributed power architectures. Operating at a typical efficiency of 75%, it supplies up to 303 mA of output current across an industrial temperature range of -40°C to +85°C. The SIP package uses a through-hole, four-pin configuration with an industry-standard pinout, simplifying board layout and drop-in replacement.
Typical deployments include isolated bias rails for RS-485/RS-232 transceivers, CAN bus nodes, and low-power sensor front-ends in industrial automation, test and measurement, and instrumentation systems. The unregulated output makes it well-suited for loads that tolerate voltage variation with line and load changes. From a procurement standpoint, the NKE series is a mature, long-lifecycle product family; nevertheless, design teams should verify current production status and any last-time-buy notifications, as obsolescence risk can increase for legacy form factors. While ideal for commercial and industrial platforms, the standard NKE0503DC does not carry military /883 screening or extended reliability suffix codes. For defense or high-reliability programs requiring additional qualification, evaluation of Murata’s dedicated high-reliability converter series is recommended. Supporting safety certifications (UL 60950) and isolation integrity documentation are typically available upon request.
| Attribute | Value |
|---|---|
| Product Type | Isolated DC-DC Converters |
| Series | NKE |
| Subcategory | DC-DC Converters |
| Height | 5.4 mm (0.213 in) |
| Length | 11.5 mm (0.453 in) |
| Mounting Type | Through Hole |
| Package / Case | 8-DIP Module, 4 Leads |
| Size / Dimension | 0.45" L x 0.39" W x 0.21" H (11.5mm x 9.8mm x 5.4mm) |
| Width | 9.8 mm (0.386 in) |
| Current - Output (Max) | 303mA |
| Input Voltage, Max | 5.5 V |
| Input Voltage, Min | 4.5 V |
| Input Voltage, Nominal | 5 V |
| Isolation Voltage | 3 kV |
| Number of Outputs | 1 |
| Output Current-Channel 1 | 303 mA |
| Output Power | 1 W |
| Output Voltage-Channel 1 | 3.3 V |
| Power (Watts) | 1 W |
| Voltage - Input (Max) | 5.5V |
| Voltage - Input (Min) | 4.5V |
| Voltage - Isolation | 3 kV |
| Voltage - Output 1 | 3.3V |
| Maximum Operating Temperature | + 85 C |
| Minimum Operating Temperature | - 40 C |
| Operating Temperature | -40°C ~ 85°C |
| Applications | ITE (Commercial) |
| Efficiency | 74% |
| Industry | Medical, Industrial |
| Type | Isolated Module |
Download the current available datasheet for NKE0503DC.
Download Datasheet 
