Infineon Technologies BAW79DH6327XTSA1

Overview

BAW79DH6327XTSA1 from Infineon Technologies is a silicon switching diode in SOT-89 package with common-cathode dual configuration, 400 V reverse voltage rating, 1 A continuous forward current, and 1 µs typical reverse recovery time-designed for high-voltage DC-DC converter freewheeling paths in automotive power supplies.

For engineers reviewing the BAW79DH6327XTSA1 datasheet, BAW79DH6327XTSA1 pinout, BAW79DH6327XTSA1 application, or BAW79DH6327XTSA1 equivalent, key selection criteria include VR = 400 V, IF = 1 A, trr = 1 µs, VF ≤ 2.0 V at IF = 2 A, and AEC-Q101 qualification for under-hood switching use.

Technical Context

This diode operates as a fast-recovery, high-voltage switching device with a common-cathode dual-die structure in a single SOT-89 thermally enhanced package. Its 400 V VR rating supports 350 V bus designs, while the 1 µs trr enables operation up to ~500 kHz in hard-switched topologies.

The device features low thermal resistance (RthJS ≤ 35 K/W), enabling 1 W dissipation at TS ≤ 115 °C, and exhibits IR ≤ 50 µA at VR = 400 V and TA = 150 °C-critical for leakage-sensitive high-temperature automotive applications.

Key Specifications

Pinout & Package

SOT-89 package with 3-pin outline: molded thermoplastic body, exposed tab for thermal conduction, and lead-free (RoHS-compliant) terminations. Pin 1 = Anode 1, Pin 2 = Cathode (common), Pin 3 = Anode 2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage switching diode applications.

Compared with STTH1R04DJF and ES1J-M3/84A, BAW79DH6327XTSA1 uniquely balances AEC-Q101 compliance, SOT-89 compactness, and 1 µs trr-making it optimal for space-constrained automotive DC-DC modules where qualification and thermal performance are jointly critical.

Availability

BAW79DH6327XTSA1 is available at Aetrix Electronics and suitable for automotive power conversion, industrial auxiliary supplies, and LED driver circuits requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BAW79DH6327XTSA1 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, sensor, and automotive ICs, with global manufacturing and quality certification aligned to ISO/TS 16949.

BAW79DH6327XTSA1 belongs to Infineon's BAW78/BAW79 series of high-voltage switching diodes-engineered specifically for AEC-Q101-compliant automotive power conversion where reliability under thermal and electrical stress is mandatory.

FAQ

Is BAW79DH6327XTSA1 pin-compatible with BAW78DH6327XTSA1?

No. BAW79DH6327XTSA1 has a common-cathode dual-diode configuration (Anode1–Cathode–Anode2), while BAW78DH6327XTSA1 is a single-diode variant in the same SOT-89 package. Pin 2 is cathode in both, but BAW78 uses only Pins 1 and 2; BAW79 uses all three pins with Pin 3 as second anode.

What is the maximum allowable soldering temperature for BAW79DH6327XTSA1?

The device complies with JEDEC J-STD-020D reflow profile for lead-free assembly. Peak temperature must not exceed 260 °C for ≤ 30 seconds, with ramp rate ≤ 3 °C/s before and after peak. Hand-soldering requires ≤ 350 °C tip temperature for < 3 s contact time per pad.

Does BAW79DH6327XTSA1 support bidirectional current flow?

No. It is a unidirectional silicon PN junction diode. Current flows only from anode to cathode. The common-cathode configuration allows two independent forward paths (Pin 1→Pin 2 and Pin 3→Pin 2), but reverse blocking occurs independently across each junction up to 400 V.

Can BAW79DH6327XTSA1 replace a Schottky diode in a 24 V buck converter?

Only if VR margin and switching frequency permit. Schottkys offer lower VF (~0.4–0.6 V) but typically max out at 100 V VR. BAW79DH6327XTSA1 provides 400 V VR and 1 µs trr-superior for 24 V systems exposed to load dump, but its VF ≥ 1.6 V increases conduction loss versus Schottky. Use where ruggedness outweighs efficiency.