As a foundational discrete semiconductor component, diodes play a pivotal role in rectification, voltage clamping, surge protection, and current direction control across electronic systems. ROHM Semiconductor, with decades of expertise in semiconductor material and process technology, has built a comprehensive diode portfolio covering Schottky, fast recovery, Zener, and TVS types. These products are engineered for extreme environmental resilience, low power loss, and automotive-grade compliance, catering to demanding applications from EV powertrains to industrial inverters. To ensure genuine procurement, stable inventory, and professional technical support, ROHM partners with top-tier authorized distributors worldwide, enabling seamless access to these mission-critical components for manufacturers and designers.
Core Product Lines & Technical Advantages
ROHM’s diodes are tailored to diverse voltage, current, and application needs, with four key product lines leading the market in performance and versatility, backed by proprietary semiconductor processes:
1. Schottky Diodes (Low-Loss Rectification)
Optimized for high-frequency, low-voltage rectification, these diodes leverage metal-semiconductor junction technology to achieve ultra-low forward voltage and fast switching, minimizing power loss in power supplies and battery management systems:
RBxx1x Series (Automotive-Grade): AEC-Q101 qualified Schottky diodes with 45V-100V breakdown voltage and 1A-30A current rating. Features low VF=0.35V typ. (at 10A) and high surge current capability (100A max.), ideal for automotive alternator rectification and BMS circuits. The TO-220 and SOT-223 packages support both through-hole and SMD assembly, with anti-sulfuration design to adapt to harsh under-hood environments.
RSxx Series (Industrial-Grade): 20V-100V Schottky diodes for industrial power supplies and consumer electronics. Compact SOD-123 and SMA packages save PCB space, while low reverse leakage current (1μA max.) ensures stable operation in standby mode, suitable for laptop chargers and LED driver circuits.
2. Fast Recovery Diodes (FRD) & Ultra-Fast Recovery Diodes (UFRD)
Designed for high-voltage, high-speed rectification in inverters and motor drives, these diodes feature short reverse recovery time and low switching loss, enhancing system efficiency:
RGxx Series (Fast Recovery): 600V-1200V FRDs with 1A-50A current rating and reverse recovery time trr=50ns-200ns. Built-in soft recovery characteristics reduce EMI, making them suitable for industrial inverter rectifier bridges and EV charger circuits. The TO-220AB package ensures reliable heat dissipation, while RoHS compliance meets global environmental standards.
RUxx Series (Ultra-Fast Recovery): 600V-1200V UFRDs with trr≤30ns, targeting high-frequency power supplies and induction heating equipment. Low forward voltage (VF=1.2V typ.) and high thermal stability (-40℃~150℃) balance performance and reliability, with bare chip variants available for custom module integration.
3. Zener Diodes (Voltage Regulation & Protection)
Specialized in precise voltage clamping and surge protection, these diodes maintain stable reverse breakdown voltage, safeguarding sensitive circuits from voltage spikes:
BZXxx Series (General-Purpose): 2.4V-200V Zener diodes with 500mW-5W power rating. High voltage tolerance (±5% accuracy) and low temperature coefficient ensure consistent performance in consumer electronics voltage regulators and industrial control circuits. Compact SOD-323 and DO-41 packages support miniaturized designs.
BZDxx Series (Automotive-Grade): AEC-Q101 qualified Zener diodes for in-vehicle infotainment and ECU circuits. Features high surge voltage resistance and anti-vibration design, with 3V-100V breakdown voltage range and 1W-5W power rating, providing reliable over-voltage protection for automotive electronic systems.
4. TVS Diodes (Transient Voltage Suppression)
Engineered to absorb transient voltage spikes caused by ESD, lightning, and electromagnetic interference, these diodes protect electronic devices in harsh environments:
SMDxx Series (Surface-Mount): 6.5V-440V TVS diodes with 100A-1500A peak pulse current. Compact SOD-323 and SMAJ packages are ideal for portable electronics and automotive harness protection, with fast response time (≤1ns) to suppress transient spikes before they damage sensitive components.
Through-Hole TVS Diodes: 200V-1500V high-power TVS diodes for industrial power grids and EV charging stations. TO-220 and DO-204 packages support high surge current (5kA max.), providing comprehensive protection for high-voltage systems against lightning strikes and grid fluctuations.
Key Technological Advantages
Low Power Loss: Proprietary semiconductor processes reduce forward voltage (VF) and reverse leakage current, minimizing energy loss in rectification and clamping circuits, which is critical for improving the efficiency of power supplies and automotive systems.
Extreme Environmental Resilience: AEC-Q101 qualification, anti-sulfuration design, and -40℃~150℃ operating temperature range adapt to harsh automotive and industrial environments, extending product lifespan and reducing maintenance costs.
Diverse Package Options: Comprehensive SMD (SOD-123, SMA, SOT-223) and through-hole (TO-220, DO-41) packages support automated assembly, space-constrained designs, and high-power heat dissipation needs, meeting diverse application requirements.
Compliance & Reliability: RoHS and REACH compliance, along with strict quality control processes, ensure global market access, while high surge current capability and stable electrical parameters guarantee long-term reliability in mission-critical applications.
