Infineon Technologies BCW66KE6359HTMA1

Overview

BCW66KE6359HTMA1 from Infineon Technologies is an NPN bipolar junction transistor rated for 45 V V_CEO, 0.8 A I_C, and 0.5 W P_D in PG-SOT23 package; it operates with h_FE = 100–250 at I_C = 100 mA, V_CE = 1 V, and is commonly used in low-power switching and amplification stages of consumer power supplies and LED drivers.

For engineers reviewing the BCW66KE6359HTMA1 datasheet, BCW66KE6359HTMA1 pinout, BCW66KE6359HTMA1 application, or BCW66KE6359HTMA1 equivalent, key selection criteria include DC current gain consistency at 100 mA, safe operating area under 45 V collector-emitter bias, thermal performance in SOT-23 footprint, and compatibility with standard PCB reflow profiles.

Technical Context

This transistor employs a planar epitaxial silicon structure optimized for medium-speed switching (t_on/t_off < 100 ns) and linear amplification. Its base-emitter voltage is specified at 0.7 V typical at I_C = 100 mA, and collector-emitter saturation voltage is 0.1 V max at I_C = 0.5 A, I_B = 50 mA.

The device meets AEC-Q101 stress test requirements for automotive-grade discrete transistors and supports operation from −55 °C to +150 °C junction temperature, with guaranteed h_FE spread across three gain groups (K, L, M) - this part belongs to group K (100–160).

Key Specifications

Pinout & Package

BCW66KE6359HTMA1 is housed in PG-SOT23 (also known as SOT-23), a surface-mount plastic package with 3 leads, 1.3 mm pitch, and standardized JEDEC MO-178AB outline. Thermal resistance R_θJA is 300 K/W on 10 mm² copper pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCW66GHE6327XTSA1 and MMBT3904LT1G, BCW66KE6359HTMA1 offers tighter h_FE control and automotive qualification - making it optimal for safety-critical biasing and switching where predictable gain and reliability are mandatory.

Availability

BCW66KE6359HTMA1 is available at Aetrix Electronics and suitable for automotive lighting control, industrial power supply sequencing, and consumer appliance motor interface requiring stable component supply and AEC-Q101 compliance.

Supply support for BCW66KE6359HTMA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.

BCW66KE6359HTMA1 belongs to Infineon's high-reliability bipolar transistor product line designed for automotive and industrial switching and amplification applications demanding AEC-Q101 qualification and tight parametric consistency.

FAQ

Is BCW66KE6359HTMA1 pin-compatible with BCW66GHE6327XTSA1?

Yes - both share identical PG-SOT23 package and pinout (E-B-C). The only functional difference lies in h_FE grouping (K vs. G), so circuit bias networks may require minor adjustment for consistent operating point.

What is the maximum junction temperature for continuous operation?

The absolute maximum junction temperature is +150 °C. Derating begins above +25 °C ambient; at T_amb = 100 °C, maximum allowed power dissipation drops to approximately 0.17 W based on R_θJA = 300 K/W.

Does BCW66KE6359HTMA1 support lead-free reflow soldering?

Yes - it is RoHS-compliant and qualified for standard Pb-free reflow profiles (JEDEC J-STD-020, peak temperature 260 °C, 30 sec max), with moisture sensitivity level (MSL) 1, unlimited floor life.

Can BCW66KE6359HTMA1 replace BCW66 in legacy designs?

Yes - it is a direct replacement with identical electrical specs and packaging. The "E6359HTMA1" suffix denotes Infineon's tape-and-reel packaging and AEC-Q101 qualification; no schematic or layout changes are needed.