Infineon Technologies SMBTA42E6327HTSA1

Overview

SMBTA42E6327HTSA1 from Infineon Technologies is an NPN silicon high-voltage transistor in SOT-23 package, rated for V_CEO = 300 V, I_C = 500 mA, and P_tot = 360 mW at T_S ≤ 74 °C, used in flyback snubber circuits and HV switching power supplies.

For engineers reviewing the SMBTA42E6327HTSA1 datasheet, SMBTA42E6327HTSA1 pinout, SMBTA42E6327HTSA1 application, or SMBTA42E6327HTSA1 equivalent, key selection criteria include high-voltage breakdown (V_CEO/V_CBO = 300 V), low V_CE(sat) ≤ 0.5 V at I_C = 20 mA/I_B = 2 mA, h_FE ≥ 25 at I_C = 1 mA, thermal resistance R_thJS ≤ 210 K/W, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a high-voltage NPN switch with complementary PNP pairing (SMBTA92), supporting linear and switching modes up to 150 °C junction temperature. Its design emphasizes robustness under high collector-emitter stress, with guaranteed V_(BR)CEO and V_(BR)CBO of 300 V at I_C = 1 mA and I_C = 100 µA respectively.

The transistor delivers f_T = 50–70 MHz at I_C = 10 mA/V_CE = 20 V, enabling medium-frequency switching applications. C_cb = 3 pF at V_CB = 20 V/1 MHz supports stable high-voltage gain control and minimizes Miller effect in fast-switching topologies.

Key Specifications

Pinout & Package

Package: SOT-23 (JEDEC TO-236AB), surface-mount, 3-pin plastic case with standard reel packaging (3,000 pcs/reel, ø180 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN transistor applications.

Compared with MMBTA42, SMBTA42E6327HTSA1 offers identical performance with traceable AEC-Q101 certification and standardized Infineon reel logistics; versus ZTX653, it trades higher power capability for automotive qualification and smaller SOT-23 footprint-critical for space-constrained ECUs.

Availability

SMBTA42E6327HTSA1 is available at Aetrix Electronics and suitable for switch-mode power supply snubbers, automotive ignition drivers, and industrial relay interfaces requiring stable component supply with automotive-grade reliability and consistent SOT-23 form factor.

Supply support for SMBTA42E6327HTSA1 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 and discrete devices.

SMBTA42E6327HTSA1 belongs to Infineon's high-voltage bipolar transistor product line, designed specifically for automotive and industrial switching applications demanding robust 300 V breakdown and AEC-Q101 compliance.

FAQ

What is the maximum allowable junction temperature for SMBTA42E6327HTSA1?

The absolute maximum junction temperature (T_j) is 150 °C, as specified in the Infineon datasheet. Operation beyond this limit risks permanent degradation of h_FE, increased leakage, and bond wire failure. Derating is required above T_S = 74 °C per the P_tot vs. T_S curve, with R_thJS ≤ 210 K/W defining thermal limits from junction to solder point.

Is SMBTA42E6327HTSA1 pin-compatible with SMBTA92?

No - SMBTA42E6327HTSA1 is an NPN transistor with pinout E-B-C (1-2-3), while SMBTA92 is its PNP complement with reversed polarity and identical SOT-23 mechanical layout but inverted electrical behavior. Direct substitution would invert logic and cause circuit failure; they are complementary, not interchangeable.

Does SMBTA42E6327HTSA1 support pulse operation beyond its DC ratings?

Yes - the datasheet provides permissible pulse load curves showing P_tot(max)/P_tot(DC) ratios up to 10× for t_p < 100 µs at D ≤ 0.02. This enables short-duration surge current handling (e.g., ignition coil firing) well above the 500 mA DC limit, provided average power and thermal mass constraints are respected.

How does the AEC-Q101 qualification impact SMBTA42E6327HTSA1's use in industrial applications?

AEC-Q101 qualification subjects the device to accelerated stress tests including HTGB, HTRB, temperature cycling, and ESD that exceed standard industrial requirements. While not mandatory for industrial use, it provides proven margin against thermal shock, humidity, and long-term parametric drift-making it preferred for mission-critical or high-reliability industrial deployments where field failure risk must be minimized.