Infineon Technologies SMBTA56E6433HTMA1

Overview

SMBTA56E6433HTMA1 from Infineon Technologies is a PNP silicon small-signal transistor in SOT-23 package, rated for 80 V V_CEO, 500 mA I_C, and 330 mW P_tot at T_S ≤ 79 °C, with h_FE ≥ 100 at I_C = 10 mA, used in low-voltage switching and amplification stages of automotive body control modules.

For engineers reviewing the SMBTA56E6433HTMA1 datasheet, SMBTA56E6433HTMA1 pinout, SMBTA56E6433HTMA1 application, or SMBTA56E6433HTMA1 equivalent, key selection criteria include V_CE(sat) ≤ 0.25 V at I_C = 100 mA/I_B = 10 mA, f_T ≥ 100 MHz, RoHS-compliant SOT-23 footprint, AEC-Q101 qualification, and complementary pairing with SMBTA06.

Technical Context

This PNP bipolar junction transistor operates in active and saturation regions for linear amplification and digital switching. Its DC current gain (h_FE) is specified at two bias points: ≥100 at I_C = 10 mA/V_CE = 1 V and ≥100 at I_C = 100 mA/V_CE = 1 V, supporting stable gain across mid-current range.

Thermal performance is defined by R_thJS ≤ 215 K/W and junction temperature limit of 150 °C. The device meets AEC-Q101 stress testing requirements for automotive applications, including temperature cycling, humidity bias, and HTRB.

Key Specifications

Pinout & Package

SOT-23 surface-mount plastic package with gull-wing leads; 3-pin configuration, tape-and-reel packaging (3,000 pcs/reel, ø180 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC856B and MMDT5551-7-F, SMBTA56E6433HTMA1 uniquely balances 80 V ruggedness, AEC-Q101 qualification, and PNP polarity in a single SOT-23 device-making it optimal for automotive switching where both voltage headroom and qualification are mandatory.

Availability

SMBTA56E6433HTMA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer audio signal paths requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SMBTA56E6433HTMA1 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.

SMBTA56E6433HTMA1 belongs to Infineon's AEC-Q101-qualified small-signal transistor family, designed specifically for robust, space-constrained switching and amplification in automotive and industrial environments.

FAQ

Is SMBTA56E6433HTMA1 pin-compatible with SMBTA56 or MMBTA56?

Yes. SMBTA56E6433HTMA1 uses the same SOT-23 package with identical pinout (1 = Base, 2 = Emitter, 3 = Collector) and electrical specifications as SMBTA56/MMBTA56. The suffix "E6433HTMA1" denotes Infineon's specific reel packaging and traceability coding, not functional deviation.

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current is 100 mA per the datasheet's "Maximum Ratings" table. For reliable long-term operation, design base drive to maintain I_B ≤ 10 mA at I_C = 100 mA (h_FE-based), avoiding thermal runaway and ensuring stable saturation below the 200 mA pulsed IBM limit.

Does this transistor support operation at −40 °C ambient?

Yes. SMBTA56E6433HTMA1 is characterized from −65 °C to +150 °C (T_stg) and qualified per AEC-Q101, which includes operation down to −40 °C. Electrical parameters like h_FE and V_CE(sat) are guaranteed across this full automotive temperature range.

Can SMBTA56E6433HTMA1 replace BC556 in existing designs?

Only with verification. BC556 uses TO-92 package (different thermal and mechanical behavior) and has V_CEO = 65 V. While electrical specs overlap partially, the 80 V rating, AEC-Q101 qualification, and SOT-23 footprint of SMBTA56E6433HTMA1 require layout and thermal validation before substitution in production.