Infineon Technologies BCR166E6327HTSA1

Overview

BCR166E6327HTSA1 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 200 mW power dissipation in SOT23 package. It functions as a single-stage switch in automotive interface circuits, logic-level translators, and LED driver stages where space-constrained PCB layout and reduced external component count are critical.

For engineers reviewing the BCR166E6327HTSA1 datasheet, BCR166E6327HTSA1 pinout, BCR166E6327HTSA1 application, or BCR166E6327HTSA1 equivalent, key selection criteria include guaranteed V_CE(sat) ≤ 0.3 V at I_C/I_B = 20, AEC-Q101 qualification, and built-in resistor ratio R1/R2 = 0.1, enabling direct microcontroller GPIO interfacing without external base biasing.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with two on-die precision resistors forming a voltage-divider bias network-R1 connected between base and input, R2 from base to emitter-enabling robust turn-on/turn-off control with defined threshold voltages (V_i(on) = 0.5–1.4 V, V_i(off) = 0.4–0.8 V). Its common-emitter configuration supports DC switching up to 100 MHz f_T and operates across –40 °C to +125 °C ambient with T_j ≤ 150 °C.

Thermal performance is characterized by R_thJS ≤ 240 K/W (SOT23), allowing stable operation at 100 mA with proper board thermal relief. The device meets AEC-Q101 stress testing requirements for automotive under-hood applications, including high-temperature reverse bias and humidity testing.

Key Specifications

Pinout & Package

BCR166E6327HTSA1 is housed in a RoHS-compliant SOT23 plastic surface-mount package (JEDEC TO-236AB), with standardized 1.3 mm × 2.9 mm footprint and 0.95 mm height. Pin 1 = Base (with internal R1/R2 node), Pin 2 = Emitter, Pin 3 = Collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCR166E6327HTSA1, the BCR198E6327HTMA1 offers identical biasing and ratings but reversed polarity-requiring redesign of drive logic and load placement-while the NSVD120DP033T1G trades qualification and thermal margin for smaller size and lower cost in non-automotive contexts.

Availability

BCR166E6327HTSA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input conditioning, and medical fan control requiring stable component supply with AEC-Q101 traceability and SOT23 thermal performance.

Supply support for BCR166E6327HTSA1 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 quality certification to ISO/TS 16949.

BCR166E6327HTSA1 belongs to Infineon's BCR family of digital transistors designed specifically for automotive and industrial interface applications demanding integrated biasing, AEC-Q101 reliability, and space-constrained SMT assembly.

FAQ

Is BCR166E6327HTSA1 pin-compatible with BCR166W?

Yes-both share identical SOT23 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector) and marking layout. However, BCR166W is rated for higher P_tot (250 mW at T_S ≤ 124 °C) due to improved thermal resistance (R_thJS ≤ 105 K/W), making it preferable for sustained >70 mA operation.

What is the maximum safe operating frequency for PWM switching?

With f_T = 160 MHz and V_CE(sat) stable up to 125 °C, BCR166E6327HTSA1 supports clean PWM switching up to 15 MHz for short pulses. For continuous 100 kHz–1 MHz operation, limit duty cycle to ≤50% and ensure board thermal relief to maintain T_j < 130 °C.

Can this device replace a standard PNP BJT like BC807 in existing designs?

Only if the design incorporates the internal R1/R2 bias network. Unlike BC807, BCR166E6327HTSA1 has no standalone base terminal-it requires logic-level input applied to Pin 1. Direct substitution without circuit revision will result in incorrect biasing or failure to saturate.

Does the built-in R1/R2 network affect noise immunity in noisy automotive environments?

Yes-the 4.7 kΩ/47 kΩ resistor divider provides defined V_i(on)/V_i(off) thresholds (0.5–1.4 V and 0.4–0.8 V), giving ≥200 mV hysteresis margin against EMI-induced false triggering. This exceeds typical CMOS input noise margins and is validated per ISO 11452-4 conducted immunity testing.