Infineon Technologies BC857AE6327HTSA1

Overview

BC857AE6327HTSA1 from Infineon Technologies is a PNP silicon small-signal transistor optimized for audio-frequency input stages and driver circuits. It delivers high DC current gain (h_FE = 125–220 at I_C = 10 µA), low V_CE(sat) (max 250 mV at I_C = 10 mA/I_B = 0.5 mA), and low noise (1 dB typical at 1 kHz, 200 Hz bandwidth), enabling precision analog amplification in compact consumer and industrial signal chains.

For engineers reviewing the BC857AE6327HTSA1 datasheet, BC857AE6327HTSA1 pinout, BC857AE6327HTSA1 application, or BC857AE6327HTSA1 equivalent, key selection criteria include its SOT23 package footprint, A-grade h_FE binning, AEC-Q101 qualification for automotive use, and complementary pairing with BC847A NPN transistors in push-pull configurations.

Technical Context

This device operates as a general-purpose PNP bipolar junction transistor with fixed emitter-base and collector-base junctions, designed for linear amplification and switching below 250 MHz. Its h_FE grading (Group A) ensures consistent current amplification across production lots, while its 45 V V_CEO rating supports operation in 24 V and 36 V rail systems.

Thermal performance is defined by R_thJS ≤ 240 K/W (SOT23), enabling reliable operation up to T_j = 150 °C. The 1.5 pF C_cb and 8 pF C_eb values support stable gain in audio-band amplifiers without unintended high-frequency roll-off or oscillation.

Key Specifications

Pinout & Package

BC857AE6327HTSA1 is housed in a standard SOT23 plastic surface-mount package (3-pin, 1.3 mm × 2.9 mm × 1.0 mm), with lead-free (RoHS-compliant) terminations and AEC-Q101 qualification for automotive under-hood use.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Compared with BC857AE6327HTSA1, the BC857B offers higher gain consistency for precision biasing, while MMBT857LT1G demands mechanical redesign but provides second-source availability-neither alters thermal or noise performance.

Availability

BC857AE6327HTSA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer audio front-ends requiring stable component supply and long-term lifecycle assurance.

Supply support for BC857AE6327HTSA1 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, with global manufacturing and quality certification infrastructure.

This transistor belongs to Infineon's BC846–BC860 family of general-purpose bipolar transistors, engineered for high-reliability analog signal conditioning and switching in cost-sensitive, space-constrained applications.

FAQ

Is BC857AE6327HTSA1 pin-compatible with BC847A?

No-BC857A is PNP while BC847A is NPN; they share identical SOT23 pinout (E-B-C), enabling complementary placement in push-pull or differential pairs, but polarity reversal must be accounted for in schematic and layout.

What is the maximum operating temperature for continuous use?

The junction temperature must not exceed 150 °C. At ambient temperatures above 60 °C, derating per the P_tot vs. T_S curve (330 mW at T_S ≤ 71 °C) is required; thermal vias and copper area are recommended for sustained 100 mA operation.

Does this part support DC-coupled audio applications?

Yes-its low 1 dB noise figure at 1 kHz and stable h_FE down to I_C = 10 µA make it suitable for DC-coupled preamp stages; however, V_BE(ON) drift with temperature must be compensated in high-precision designs.

How does AEC-Q101 qualification impact board-level testing?

AEC-Q101 qualification confirms robustness against thermal shock, humidity, and mechanical stress-but does not eliminate need for functional validation in final system; board-level tests must still verify gain, saturation, and noise performance under actual operating conditions.