RIM78-0.5 – Switching regulator 0.5A

DC/DC Step-Down Converters – SIL-3 – 0.5 A – Compact, Efficient & LM78xx-Compatible

The RIM78-XXX-0.5 series from HN Electronic Components is a modern and energy-efficient alternative to traditional linear voltage regulators. These compact, non-isolated DC/DC step-down converters provide a stable output current of up to 0.5 A, require no heat sink, and offer an efficiency of up to 94%.

With their SIL-3 plastic housing, fully SMD-based design, and pin compatibility with LM78XX regulators, the modules are the ideal drop-in replacement for inefficient linear regulators—without any layout changes.

🔧 Features & Benefits

• Wide input voltage range (depending on model, up to 28 V)
• High efficiency up to 94% – ideal for energy-optimized designs
• Pin-compatible with LM78xx / LM78Mxx – easy drop-in replacement
• No heat sink required – reduced size & lower system cost
• Short-circuit protected (auto recovery)
• SIL-3 plastic case, UL94V-0 – robust & safe
• Full SMD technology – modern manufacturing, high packing density
• Compliant with EN 60950-1, EMC according to EN 55022 Class B
• Wide operating temperature range: −40 °C to +85 °C
• MTBF over 4 million hours (MIL-HDBK-217F)

📊 Typical Applications

• IoT modules & sensors
• Embedded systems
• Automation & industrial electronics
• Energy-efficient devices & portable equipment
• Communication & control systems
• Mechanical engineering, measurement technology, robotics

🔌 Technical Highlights

Input Specifications

• Input voltage ranges: model-dependent, 4.5–28 V
• Start-up time: typically 10 ms
• Output voltage accuracy: typ. ±3%
• Reflected ripple current: typ. 40 mA p-p

Output Specifications

• Output current: up to 500 mA
• Ripple & noise: max. 60 mV p-p
• Load regulation:
  • typ. ±0.5%, max. ±0.8%
• Temperature coefficient: ±0.02%/°C

Reliability & Protection

• Short-circuit protection (automatic recovery)
• Maximum case temperature: 100 °C
• Soldering temperature: 260 °C for 10 s (1.5 mm from case)

📦 Available Models

➡ All modules are drop-in compatible with LM78xx regulators.

🛠 Standard Application & EMC Notes

Our DC/DC modules already meet strict EMC requirements. For optimal performance, we recommend the following:

Input Filter

• C1: 47 µF (soft start & protection at power-up)
• L: EMC choke
• C2: 100 µF (optional / recommended for enhanced EMC performance)

For increased EMC compliance (EN61000-4-4 / EN61000-4-5):

• External smoothing capacitor 220 µF / 100 V
  (Nippon Chemi-Con KY series recommended)

All filter components should be placed as close as possible to the module to minimize radiated noise.

🧩 Applications with Isolated Converters

For circuits that generate isolated dual outputs using RIM78 modules:

• Up to 6 kV isolation achievable
• Wide input ranges
• Improved load and line regulation
• Supports point-of-load architecture