Infineon Technologies BCR166WE6327HTSA1

Overview

BCR166WE6327HTSA1 from Infineon Technologies is a PNP silicon digital transistor with integrated bias resistors (R1 = 4.7 kΩ, R2 = 47 kΩ), rated for 50 V V_CEO, 100 mA I_C, and 250 mW power dissipation in SOT323 package. It functions as a single-stage switch or level-shifting interface in automotive body control modules, LED driver stages, and microcontroller GPIO buffer circuits.

For engineers reviewing the BCR166WE6327HTSA1 datasheet, BCR166WE6327HTSA1 pinout, BCR166WE6327HTSA1 application, or BCR166WE6327HTSA1 equivalent, key selection criteria include guaranteed V_CE(sat) ≤ 0.3 V at I_C/I_B = 20, input voltage thresholds (V_i(on) ≤ 1.4 V, V_i(off) ≥ 0.4 V), AEC-Q101 qualification, and thermal resistance R_thJS ≤ 105 K/W.

Technical Context

This digital transistor integrates two precision thin-film resistors (R1 = 4.7 kΩ ±30%, R1/R2 = 0.1 ±10%) directly into a PNP bipolar die, eliminating external base bias components. Its common-emitter switching behavior is characterized by h_FE ≥ 70 at I_C = 5 mA and V_CE = 5 V, with guaranteed V_CE(sat) ≤ 0.3 V under I_C = 10 mA / I_B = 0.5 mA conditions.

The device operates across –65 °C to +150 °C storage and junction temperature ranges, supports pulse operation up to P_tot(max)/P_tot(DC) = 10 at t_p = 10 µs (D = 0), and exhibits f_T = 160 MHz typical for high-speed switching applications requiring minimal propagation delay.

Key Specifications

Pinout & Package

BCR166WE6327HTSA1 is housed in a RoHS-compliant SOT323 (SC-70) plastic surface-mount package measuring 2.1 mm × 1.25 mm × 0.9 mm, with gull-wing leads and moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP digital transistor applications.

Compared with BC807-40W and NSVD120DP033T1G, BCR166WE6327HTSA1 uniquely balances AEC-Q101 compliance, 100 mA continuous current, and low 0.3 V saturation voltage-making it optimal for cost-sensitive, thermally constrained automotive switches where external biasing is undesirable.

Availability

BCR166WE6327HTSA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial I/O modules, and consumer appliance control panels requiring stable component supply and long-term lifecycle support.

Supply support for BCR166WE6327HTSA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and R&D centers.

BCR166WE6327HTSA1 belongs to Infineon's BCR family of digital transistors, designed specifically for replacing discrete BJT + resistor combinations in automotive and industrial switching applications where space, reliability, and qualification are critical.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The absolute maximum junction temperature (T_j) is 150 °C. For reliable long-term operation, junction temperature must remain below this limit under worst-case ambient and power dissipation conditions. Derating curves in the datasheet show P_tot decreases linearly above T_S = 124 °C for the SOT323 variant, requiring thermal design that maintains solder-point temperature within specification.

Can BCR166WE6327HTSA1 be used in high-frequency switching applications above 1 MHz?

Yes-its typical transition frequency (f_T) is 160 MHz, supporting clean switching up to ~10 MHz with minimal gain roll-off. However, practical switching speed is limited by external load capacitance and PCB layout; for >5 MHz operation, keep trace lengths short and minimize parasitic inductance in the collector path to avoid ringing.

Is the SOT323 package compatible with standard SMT reflow profiles?

Yes-the SOT323 package is MSL 1 and rated for peak reflow temperatures up to 260 °C per JEDEC J-STD-020. Standard lead-free reflow profiles (e.g., IPC/JEDEC J-STD-020 Class 3) apply; no special pre-bake or handling is required, provided humidity exposure remains within MSL 1 limits.

How does the built-in resistor network affect input impedance and noise immunity?

The R1/R2 network sets a fixed input impedance of ~5.2 kΩ (R1 || R2) at DC, providing inherent noise filtering for slow-edge signals. At high frequencies, the 3 pF C_cb dominates, lowering impedance-so for >1 MHz noise rejection, an external RC filter at the base pin is recommended to maintain immunity without compromising switching speed.