As a foundational component in power switching, amplification, and current control circuits, bipolar transistors are widely used across automotive, industrial, and consumer electronics. ROHM Semiconductor, with decades of semiconductor design and manufacturing expertise, has built a comprehensive bipolar transistor portfolio covering power, small-signal, and Darlington types. These products are engineered for high current gain, low power loss, and extreme environmental resilience, including AEC-Q101 automotive qualification and anti-surge capabilities. To ensure genuine procurement, stable inventory, and professional technical support, ROHM partners with top-tier authorized distributors worldwide, enabling manufacturers and designers to seamlessly access these high-reliability components for mission-critical applications.

Core Product Lines & Technical Advantages

ROHM’s bipolar transistors are tailored to diverse power and signal processing needs, with three key product lines leading the market in performance and versatility:

1. Power Bipolar Transistors

Optimized for high-current, high-voltage industrial and automotive applications, these transistors deliver robust switching performance and low saturation voltage, reducing energy loss in power control circuits:

• 2SD1071 (NPN Type): A 100V/8A power transistor with high current gain (hFE=80~320) and low VCE(sat) (0.25V typ. at Ic=4A). Suitable for automotive ignition coils, industrial motor drives, and power supply switches. Available in TO-220 through-hole and SOT-223 SMD packages, with -40℃~150℃ operating temperature range and anti-surge capability.

• 2SB1386 (PNP Type): Complementary to 2SD1071, 100V/8A PNP transistor with hFE=60~240 and VCE(sat)=0.25V typ. Ideal for push-pull amplifier circuits in automotive lighting and industrial inverters. Compliant with RoHS standards and compatible with automated assembly processes.

2. Darlington Transistors

Integrating two transistors in a single package to achieve ultra-high current gain, these products simplify design for high-current applications without additional driving circuits:

• 2SD2653 (NPN Darlington): 80V/15A Darlington transistor with hFE=1000 typ., suitable for industrial relay drives, LED lighting controllers, and consumer electronics power switches. The built-in bias resistor reduces external component count, while the compact TO-220 package saves PCB space.

• 2SB1412 (PNP Darlington): 80V/15A PNP Darlington transistor with hFE=1000 typ., complementary to 2SD2653. Ideal for push-pull circuits in automotive interior lighting and small household appliance motor drives, featuring low power consumption and stable performance in high-temperature environments.

3. Automotive-Grade Bipolar Transistors (AEC-Q101 Qualified)

Designed for harsh automotive environments, these transistors meet AEC-Q101 Grade 1 qualification (-40℃~150℃) and feature anti-sulfuration and anti-vibration capabilities:

• 2SD1760 (Automotive NPN): 120V/10A automotive transistor with hFE=50~200 and VCE(sat)=0.3V typ. Used in automotive ignition systems, engine control units (ECUs), and chassis control modules. The through-hole TO-220AB package ensures reliable heat dissipation, while the anti-surge design protects against voltage spikes.

• 2SB1698 (Automotive PNP): 120V/10A automotive PNP transistor, complementary to 2SD1760. AEC-Q101 Grade 1 qualified, suitable for automotive battery management systems (BMS) and in-vehicle infotainment power control. The low leakage current (Icbo=100nA max.) ensures long-term reliability in standby mode.

Key Technological Advantages

• High Current Gain (hFE): ROHM’s proprietary semiconductor process enables stable hFE values across a wide current range, reducing circuit design complexity and improving control precision for amplification and switching applications.

• Low Saturation Voltage: Ultra-low VCE(sat) minimizes power loss during switching, enhancing energy efficiency for industrial motor drives and automotive power systems.

• Extreme Environmental Resilience: -40℃~150℃ operating temperature range, anti-surge capability, and AEC-Q101 qualification adapt to harsh automotive and industrial environments, extending product lifespan.

• Diverse Package Options: Comprehensive SMD (SOT-223, TOLL) and through-hole (TO-220, TO-92) packages support automated assembly and space-constrained designs, meeting diverse application needs.