Infineon Technologies BC 817-25W E6433

Overview

BC817-25W E6433 from Nexperia is an NPN silicon general-purpose audio-frequency transistor in SOT323 package, rated for 45 V V_CEO, 500 mA I_C, and 250 mW P_tot at T_S ≤ 130 °C, with h_FE = 160–250 (Group 25) at I_C = 100 mA, V_CE = 1 V, used in low-voltage switching and signal amplification stages of consumer power supplies and LED drivers.

For engineers reviewing the BC817-25W E6433 datasheet, BC817-25W E6433 pinout, BC817-25W E6433 application, or BC817-25W E6433 equivalent, key selection criteria include verified h_FE group consistency, SOT323 thermal derating behavior, V_CE(sat) ≤ 0.7 V at I_C = 500 mA/I_B = 50 mA, and AEC-Q101 qualification status for automotive-grade reliability.

Technical Context

This NPN bipolar junction transistor operates in linear or saturated switching mode with a transition frequency f_T of 170 MHz at I_C = 50 mA, V_CE = 5 V, enabling use in AF amplification and fast digital interface buffering. Its low V_CE(sat) (≤0.7 V) and V_BE(sat) (≤1.2 V) support efficient current switching in 3.3 V/5 V logic-level driven circuits.

The device features a maximum collector-emitter breakdown voltage of 45 V and emitter-base breakdown voltage of 5 V, with C_cb = 3 pF and C_eb = 40 pF at specified bias conditions-parameters critical for stability in high-gain amplifier configurations and noise-sensitive analog front-ends.

Key Specifications

Pinout & Package

BC817-25W E6433 is housed in a RoHS-compliant SOT323 plastic surface-mount package, measuring 2.1 mm × 1.25 mm × 0.95 mm, optimized for automated placement and reflow soldering on dense PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC817-25W E6433, BC847BW trades current capability for higher gain in identical packaging, while MMBT3904LT1G offers broader h_FE spread and lower voltage rating in a larger SOT23 body-neither matches its 45 V/500 mA/AEC-Q101 combination in SOT323.

Availability

BC817-25W E6433 is available at Aetrix Electronics and suitable for LED driver stages, microcontroller interface buffers, low-voltage relay drivers, and power supply feedback transistors requiring stable component supply across automotive, industrial, and consumer production programs.

Supply support for BC817-25W E6433 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 high-volume, high-reliability discrete and logic devices, with manufacturing rooted in Philips' legacy and headquartered in Nijmegen, Netherlands.

BC817-25W E6433 belongs to Nexperia's BC817K series of AEC-Q101-qualified general-purpose NPN transistors designed specifically for automotive body electronics and industrial control modules demanding robust parametric consistency and thermal performance.

FAQ

What is the maximum allowable junction temperature for BC817-25W E6433?

The absolute maximum junction temperature T_j is 150 °C, as specified in the Absolute Maximum Ratings table. Operation above this limit risks permanent degradation of h_FE and increased leakage. Derating curves in Figure 7 confirm that at T_S = 130 °C, P_tot must be limited to 250 mW to maintain safe T_j.

Does BC817-25W E6433 support pulsed operation beyond its DC power rating?

Yes-Figure 7 and Figure 8 provide pulse derating data. At duty cycle D = 0.01 and pulse width t_p = 100 µs, P_tot(max)/P_tot(DC) reaches ~3.5×, allowing up to ~875 mW peak dissipation. Thermal resistance R_thJS ≤ 80 K/W governs transient junction-to-solder-point rise.

How does h_FE vary with collector current and temperature?

Per Figure 5, h_FE peaks near I_C = 10–100 mA and declines at both low (<1 mA) and high (>300 mA) currents. At −40 °C, h_FE drops ~25% versus 25 °C; at 105 °C, it rises ~15% for Group 25 devices-behavior confirmed by test data across three temperature points.

Is BC817-25W E6433 pin-compatible with BC817-25?

No-BC817-25W uses SOT323 packaging while BC817-25 uses SOT23. Though both share identical pin configuration (1=B, 2=E, 3=C), their footprints differ: SOT323 is smaller (2.1 × 1.25 mm) and has tighter pad spacing, requiring separate PCB land patterns and stencil apertures.