Infineon Technologies BC817K25E6433HTMA1

Overview

BC817K25E6433HTMA1 from Nexperia is an NPN silicon general-purpose audio-frequency transistor with h_FE group 25 (160–250), 45 V V_CEO, 500 mA I_C, and 0.7 V V_CE(sat) at 500 mA/50 mA, qualified to AEC-Q101 for automotive use in signal switching and amplification stages.

For engineers reviewing the BC817K25E6433HTMA1 datasheet, BC817K25E6433HTMA1 pinout, BC817K25E6433HTMA1 application, or BC817K25E6433HTMA1 equivalent, key selection criteria include DC current gain grouping, saturation voltage under high-current drive, thermal resistance (R_thJS ≤ 70 K/W), and SOT23 package compatibility with automated assembly.

Technical Context

This transistor operates as a medium-power NPN switch or linear amplifier in low-voltage analog and digital interface circuits. Its h_FE group 25 ensures predictable current amplification across 100–500 mA collector loads at V_CE = 1 V, while the 45 V V_CEO rating supports 24 V rail applications with margin.

The device uses epitaxial planar die construction with Pb-free SOT23 packaging, achieving 0.7 V V_CE(sat) at I_C/I_B = 500 mA/50 mA and 1.2 V V_BE(sat) under same conditions-enabling efficient low-side switching in power management and level-shifting circuits.

Key Specifications

Pinout & Package

BC817K25E6433HTMA1 is housed in a standard SOT23 plastic surface-mount package with gull-wing leads, optimized for reflow soldering and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Compared with BC817K25E6433HTMA1, BC817-25,115 offers identical electrical performance without automotive qualification, while MMBT3904LT1G trades current capability and voltage margin for broader h_FE distribution and lower cost in non-automotive designs.

Availability

BC817K25E6433HTMA1 is available at Aetrix Electronics and suitable for automotive interior lighting control, industrial PLC digital output stages, and consumer appliance motor drivers requiring stable component supply and AEC-Q101 compliance.

Supply support for BC817K25E6433HTMA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

BC817K25E6433HTMA1 belongs to the BC817K series of AEC-Q101-qualified NPN transistors designed specifically for automotive signal switching and amplification where robustness, consistent h_FE, and low saturation voltage are critical.

FAQ

Is BC817K25E6433HTMA1 pin-compatible with BC817-25?

Yes, BC817K25E6433HTMA1 uses the standard SOT23 package with Base-Emitter-Collector pinout (1-2-3), matching BC817-25, BC817-40, and MMBT3904. No PCB layout change is required for substitution, though AEC-Q101 qualification and tighter h_FE binning differentiate it in automotive applications.

What is the maximum allowable junction temperature for continuous operation?

The absolute maximum junction temperature is 150 °C. With R_thJS ≤ 70 K/W and P_tot = 500 mW at T_S ≤ 115 °C, sustained operation at full current requires board-level thermal design that maintains solder-point temperature below 115 °C to avoid derating.

Does BC817K25E6433HTMA1 support pulsed operation beyond 500 mA?

Yes-peak collector current I_CM is rated at 1000 mA for pulse widths < 300 µs and duty cycle < 2%. This enables short-duration surge handling in motor startup or solenoid actuation, provided average power remains within 500 mW limits and thermal mass prevents junction overheating.

How does the h_FE group 25 affect bias network design?

With h_FE guaranteed between 160 and 250 at 100 mA/1 V, bias resistors can be selected for worst-case current gain to ensure saturation across temperature and process variation. For example, driving 500 mA load requires minimum 2.0 mA base current, so a 2.2 kΩ resistor from 5 V logic suffices even at h_FE = 160.