Nexperia USA Inc. BC817K-25VL

Overview

BC817K-25VL from Nexperia is an AEC-Q101 qualified NPN general-purpose transistor in SOT23 (TO-236AB) package, rated for 45 V V_CEO, 500 mA continuous collector current, and offering h_FE of 160–400 at V_CE = 1 V, I_C = 100 mA. It serves as a compact, thermally robust switching and amplification device in automotive body control modules, industrial sensor interfaces, and consumer power management circuits.

For engineers reviewing the BC817K-25VL datasheet, BC817K-25VL pinout, BC817K-25VL application, or BC817K-25VL equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOT23 terminal mapping, automotive qualification evidence, and real-world use context - all extracted directly from Nexperia's official Rev. 2 product data sheet dated 6 March 2018.

Technical Context

This discrete NPN bipolar junction transistor operates with a maximum collector-emitter breakdown voltage of 45 V and supports pulsed peak currents up to 1 A. Its DC current gain (h_FE) is binned to 160–400 under standard test conditions (V_CE = 1 V, I_C = 100 mA, pulsed), enabling predictable biasing in linear and saturated switching modes.

Thermal performance is defined across four PCB mounting configurations: R_th(j-a) ranges from 162 K/W (4-layer FR4, 1 cm² collector pad) to 358 K/W (single-sided FR4, standard footprint). The device achieves f_T ≥ 100 MHz at V_CE = 5 V, I_C = 10 mA, confirming suitability for medium-speed digital and analog signal handling.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and gull-wing terminations compatible with standard reflow soldering profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC817K-25VL, BC817-25,115 sacrifices automotive reliability and thermal flexibility for lower cost, while MMBT3904LT1G trades voltage margin, gain consistency, and qualification for broader distributor availability - making BC817K-25VL the optimal choice for AEC-compliant, thermally demanding designs.

Availability

BC817K-25VL is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and IoT power management requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for BC817K-25VL 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, mobile, and computing markets.

The BC817K series belongs to Nexperia's AEC-Q101 qualified general-purpose transistor portfolio, engineered specifically for robust, cost-effective switching and amplification in harsh-environment automotive and industrial control systems.

FAQ

What is the maximum allowable junction temperature for BC817K-25VL?

The absolute maximum junction temperature (T_j) is 150 °C, as specified in Table 6 of the Nexperia datasheet. Operation beyond this limit risks permanent parametric shift or failure. Derating curves in Figure 1 confirm that power dissipation must be reduced linearly above 25 °C ambient, down to zero at 150 °C for the 4-layer PCB configuration.

Does BC817K-25VL support 24 V automotive systems with load dump?

Yes. With V_CEO = 45 V and V_CBO = 50 V, BC817K-25VL withstands ISO 7637-2 Pulse 5a load-dump transients (up to 40 V for 400 ms) when properly clamped and biased. Its AEC-Q101 qualification further validates robustness against repetitive stress events encountered in vehicle electrical systems.

How does the h_FE binning affect base resistor selection?

The 160–400 h_FE range means base current must be sized for the minimum gain (160) to ensure saturation across all units. For 500 mA collector current, I_B ≥ 3.125 mA is required (500 mA ÷ 160); typical design uses 5–10 mA to accommodate temperature drift and aging, yielding V_CE(sat) ≤ 700 mV.

Can BC817K-25VL replace BC817-25 in existing designs?

Yes, pin-for-pin and electrically compatible, but BC817K-25VL adds AEC-Q101 qualification and four thermal rating options. If the original design targets automotive use or requires enhanced thermal performance, BC817K-25VL is a direct upgrade; for commercial-only applications, verify whether qualification adds value versus cost.