RN1405,LXHF

Overview

The RN1405,LXHF is a single NPN pre-biased digital transistor manufactured by Toshiba Semiconductor and Storage. It integrates an NPN bipolar junction transistor with internal biasing resistors (R1=10kΩ, R2=10kΩ) in a compact surface-mount package. Key electrical specifications include a collector-emitter breakdown voltage (VCEO) of 50V, a continuous collector current (Ic) of 100mA, and a transition frequency (fT) of 250MHz. The device features a minimum DC current gain (hFE) of 50 at Ic=10mA and Vce=5V, with a maximum power dissipation of 100mW. It operates within a temperature range of -55°C to +150°C and holds AEC-Q101 automotive qualification.

Feature Summary

• Integrates NPN transistor with dual biasing resistors for simplified circuit design
• Automotive-grade reliability certified under AEC-Q101 standards
• High-speed switching capability with 250MHz transition frequency
• Compact SMD packaging suitable for space-constrained applications

Applications

• Automotive electronic control unit input buffering
• General-purpose logic level shifting in consumer electronics
• Switching applications in battery-powered devices
• Interface circuits between microcontrollers and peripheral sensors

Procurement Notes

Verify the specific suffix LXHF against the official Toshiba datasheet to confirm pinout configuration and resistor tolerance values. Ensure the ordering code matches the required tape-and-reel or cut-tape format specified in the manufacturer's catalog. Cross-reference the AEC-Q101 certification status if automotive compliance is mandatory for the target application.

Selection Notes

Select this component when a single NPN switch with integrated base and emitter resistors is required to reduce external component count. The 10kΩ/10kΩ resistor ratio provides balanced biasing for standard logic interfaces. Consider the 100mA current limit and 50V voltage rating to ensure operation within safe limits. Verify thermal management requirements given the 100mW power dissipation constraint in the selected package.

Part Context

The RN1405 belongs to Toshiba's RN series of pre-biased transistors, designed to replace discrete resistor-transistor networks. This series offers consistent performance across automotive and industrial segments. The LXHF suffix typically denotes a specific packaging variant, often associated with tape-and-reel delivery for automated assembly processes in high-volume manufacturing environments.

Replacement Considerations

Direct substitutes may include other single NPN pre-biased transistors with identical 10kΩ/10kΩ resistor configurations and compatible VCEO/Ic ratings. Verify pin compatibility and thermal characteristics before substitution. Alternative packages from the same family may require schematic adjustments.