Infineon Technologies BC857SE6433HTMA1

Overview

BC857SE6433HTMA1 from Nexperia is a dual PNP silicon small-signal transistor array in SOT363 (SC74) package, configured as two galvanically isolated transistors with matched h_FE (min 200 @ I_C = 10 µA), V_CEO = 45 V, and V_CE(sat) ≤ 250 mV @ I_C = 10 mA / I_B = 0.5 mA. It targets AF input stages and driver circuits in compact analog signal conditioning modules.

For engineers reviewing the BC857SE6433HTMA1 datasheet, BC857SE6433HTMA1 pinout, BC857SE6433HTMA1 application, or BC857SE6433HTMA1 equivalent, key selection criteria include dual-transistor matching tolerance, low saturation voltage for rail-to-rail switching, AEC-Q101 qualification for automotive ambient reliability, and thermal resistance R_thJS ≤ 140 K/W.

Technical Context

This device integrates two discrete PNP transistors on a single die with electrical isolation between collector-emitter paths. Each transistor supports DC current gain h_FE up to 630 at I_C = 2 mA and exhibits f_T = 250 MHz at I_C = 20 mA, enabling use in audio-frequency amplification and medium-speed switching.

Its V_BE(sat) ranges from 700–850 mV at I_C = 10 mA / I_B = 0.5 mA, and C_cb = 1.5 pF at V_CB = 10 V ensures minimal Miller effect in common-emitter configurations. The package's 6-pin SOT363 layout enables space-constrained dual-gain-stage designs without inter-device parasitic coupling.

Key Specifications

Pinout & Package

SOT363 (SC74) 6-pin surface-mount package with exposed thermal pad (not electrically connected); footprint compatible with automated pick-and-place and reflow soldering per IPC-7351B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC857B,315 and MBT3906DW1T1G, BC857SE6433HTMA1 uniquely delivers matched dual-PNP behavior, AEC-Q101 compliance, and sub-250 mV saturation in a single SOT363 footprint-critical for space-constrained, high-reliability analog signal chains.

Availability

BC857SE6433HTMA1 is available at Aetrix Electronics and suitable for automotive door modules, portable audio preamplifiers, industrial sensor signal conditioners, and LED dimming controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC857SE6433HTMA1 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 high-volume, high-reliability essential semiconductors for automotive, industrial, and consumer markets, with manufacturing ISO/TS 16949 certified facilities.

BC857SE6433HTMA1 belongs to Nexperia's BC856S/BC857S family of AEC-Q101-qualified dual-transistor arrays designed specifically for space-efficient, thermally robust analog signal conditioning in harsh-environment electronics.

FAQ

What is the maximum continuous collector current per transistor in BC857SE6433HTMA1?

The maximum continuous collector current per transistor is 100 mA at T_S ≤ 118 °C. This rating assumes proper PCB copper pour and thermal relief design per Nexperia Application Note AN077. Pulse operation up to 200 mA is allowed for t_p ≤ 10 ms with duty cycle D ≤ 2%.

Does BC857SE6433HTMA1 support direct replacement for BC857B in SOT23 layouts?

No-BC857SE6433HTMA1 uses SOT363 (6-pin) while BC857B uses SOT23 (3-pin). Pin count, footprint, and thermal pad presence differ fundamentally. Migration requires PCB redesign and verification of dual-transistor interaction effects in the target circuit.

How is galvanic isolation implemented between the two transistors in this package?

Galvanic isolation is achieved via physical separation of the two PNP die structures on a common substrate, with no shared collector, base, or emitter metallization. Electrical isolation exceeds 1000 V RMS between C1–C2, B1–B2, and E1–E2 terminals under standard test conditions per manufacturer characterization.

Can BC857SE6433HTMA1 be used in linear amplifier configurations with V_CE < 1 V?

Yes-its V_CE(sat) ≤ 250 mV at I_C = 10 mA enables operation in near-saturation linear regions. However, h_FE drops significantly below V_CE = 0.3 V; for stable small-signal gain, maintain V_CE ≥ 0.5 V per transistor per datasheet Figure 2 (EHP00380).