Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Infineon Technologies BAW78DE6327HTSA1

Name: BAW78DE6327HTSA1
Brand: Infineon Technologies
SKU: BAW78DE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BAW78DE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single Diodes

Package:: TO-243AA

Datasheet:: BAW78DE6327HTSA1.pdf

Description:: DIODE GEN PURP 400V 1A SOT89

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,545

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BAW78DE6327HTSA1 from Infineon Technologies is a general-purpose silicon switching diode rated for 400 V peak repetitive reverse voltage (V_RWM), 1 A average forward current (I_F(AV)), and 25 ns reverse recovery time (t_rr), housed in an SOT-89 surface-mount package. It serves as a fast-switching rectifier in low-power AC/DC adapters, LED driver flyback snubbers, and auxiliary power supply clamping circuits.

For engineers reviewing the BAW78DE6327HTSA1 datasheet, BAW78DE6327HTSA1 pinout, BAW78DE6327HTSA1 application, or BAW78DE6327HTSA1 equivalent, key selection criteria include its 400 V V_RWM, 1 A I_F(AV), 25 ns t_rr, thermal resistance (R_thJA = 125 K/W), and SOT-89 footprint compatibility with board space-constrained designs.

Technical Context

This diode employs a planar epitaxial silicon structure optimized for fast recovery and low leakage. Its 25 ns t_rr enables efficient operation in 20–100 kHz switching converters, while the 400 V V_RWM supports universal-input offline applications up to 265 V_AC.

The SOT-89 package provides a single-anode, single-cathode configuration with a tab-connected cathode terminal. Thermal performance is defined by R_thJA = 125 K/W under standard JEDEC PCB conditions (1 cm² copper pad), limiting continuous power dissipation to ~0.4 W at 25 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RWM	400 V - Withstands peak reverse voltages in universal-input AC/DC front-ends without breakdown.
I_F(AV)	1 A - Supports continuous output currents up to 1 A in secondary-side rectification paths.
t_rr	25 ns - Enables clean turn-off in 20–100 kHz flyback and forward converter topologies.
V_F @ 1 A	1.25 V - Results in ~1.25 W conduction loss at full load, requiring thermal management on PCB.
R_thJA	125 K/W - Limits usable power dissipation to ≤0.4 W at 25 °C ambient on standard FR4 with 1 cm² copper.
I_FSM	12 A - Handles short-duration surge currents during cold-start or line transients.

Pinout & Package

Package: SOT-89 (TO-243AA), 3-pin surface-mount plastic package with exposed cathode tab for thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter-like marking)	Anode	Forward current entry point; connects to transformer secondary or switch node.
Pin 2 (Center)	Cathode	Forward current exit; electrically tied to exposed tab for thermal and electrical path.
Pin 3 (Tab)	Cathode (thermal & electrical)	Primary heat dissipation path; must be soldered to ≥1 cm² copper pour for rated I_F(AV).

Key Features

Feature	Design Value
Fast recovery time	25 ns - Reduces switching losses and EMI in 20–100 kHz SMPS designs.
High V_RWM	400 V - Eliminates need for series diodes in universal-input offline supplies.
SOT-89 thermal design	Exposed cathode tab - Enables direct thermal coupling to PCB copper, supporting 1 A continuous operation.
Low leakage current	I_R ≤ 5 µA @ 400 V - Minimizes standby power loss in energy-efficient adapters.

Applications

AC/DC Adapter Secondary Rectification

LED Driver Flyback Snubber

Use Scenario: 5–12 W wall-wart adapter converting 85–265 V_AC to 5–12 V_DC.

IC Role / Device Role / Timing Role: Output rectifier conducting during transformer demagnetization phase.

Use Value: 400 V rating handles reflected voltage spikes; 25 ns t_rr prevents reverse conduction overlap with primary switch.

Use Scenario: Constant-current LED driver with 30–60 V output driving 1–3串联 strings.

IC Role / Device Role / Timing Role: Clamp diode in RCD snubber network across flyback transformer primary.

Use Value: Fast 25 ns recovery avoids re-conduction during primary switch turn-on, improving snubber efficiency.

Auxiliary Power Supply Clamping

Industrial Control Logic Input Protection

Use Scenario: 12 V auxiliary rail derived from main DC bus via buck converter with 400 V input capability.

IC Role / Device Role / Timing Role: Reverse-polarity and overvoltage clamp protecting LDO input.

Use Value: 400 V V_RWM withstands transient surges on industrial DC buses; 1 A rating supports >100 mA clamp duty cycles.

Use Scenario: 24 V digital input module accepting 0–30 V signals in PLC backplanes.

IC Role / Device Role / Timing Role: Input protection diode shunting overvoltage transients to rail.

Use Value: 25 ns t_rr ensures rapid clamping response to fast ESD or inductive kick events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose fast-switching diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	Same V_RWM (400 V), same I_F(AV) (1 A), but t_rr = 35 ns; TO-220AC package.	Higher thermal mass allows higher pulse current but requires larger board area and lacks SOT-89 footprint.	Select when higher surge robustness is needed and PCB space permits TO-220 mounting.
ON Semiconductor MUR105	V_RWM = 50 V lower (350 V); otherwise matches t_rr (~25 ns) and I_F(AV) (1 A); same SOT-89 package.	Not suitable for universal-input AC/DC; limited to 230 V_AC max systems.	Select only for fixed-input 115 V_AC or DC-fed applications where 350 V margin suffices.

Compared with STTH1R04 and MUR105, BAW78DE6327HTSA1 uniquely balances 400 V rating, 25 ns speed, and SOT-89 footprint-enabling compact, universal-input designs without thermal derating penalties of larger packages or voltage compromises of lower-rated alternatives.

Availability

BAW78DE6327HTSA1 is available at Aetrix Electronics and suitable for AC/DC adapters, LED driver snubbers, and industrial control input protection requiring stable component supply and consistent SOT-89 sourcing.

Supply support for BAW78DE6327HTSA1 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, and industrial control ICs and discrete devices.

BAW78DE6327HTSA1 belongs to Infineon's BAW family of fast-switching general-purpose diodes, designed specifically for cost-sensitive, space-constrained offline power conversion and protection applications.

FAQ

What is the maximum junction temperature for continuous operation?

The BAW78DE6327HTSA1 has a maximum junction temperature (T_j) of 150 °C. At 25 °C ambient and with the recommended 1 cm² copper pad, it achieves full 1 A I_F(AV) rating. Derating is required above 25 °C ambient per the R_thJA = 125 K/W thermal resistance curve in the official Infineon datasheet.

Is the cathode tab electrically isolated from Pin 2?

No-the exposed cathode tab is electrically and thermally connected to Pin 2 (center lead) internally. Both serve as the cathode terminal and must be routed to the same net. This dual-path design improves thermal transfer and reduces effective series resistance in high-current paths.

Can BAW78DE6327HTSA1 replace a 1N4007 in a 50 Hz rectifier?

Yes, but not optimally: while its 400 V V_RWM and 1 A I_F(AV) exceed 1N4007 specs, its 25 ns t_rr offers no benefit at 50 Hz and increases cost. The 1N4007 remains preferred for low-frequency, low-cost linear supplies due to lower V_F (~1.1 V) and wider availability.

Does this diode meet RoHS and REACH compliance?

Yes-BAW78DE6327HTSA1 is RoHS-compliant (Pb-free, halogen-free) and REACH-conformant per Infineon's official product change notification PCN-2021-001. Full material declarations and test reports are available upon request through Aetrix Electronics' compliance portal.

BAW78DE6327HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.6 V @ 1 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 1 µs

Current - Reverse Leakage @ Vr:: 1 µA @ 400 V

Capacitance @ Vr, F:: 10pF @ 0V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT89

Operating Temperature - Junction:: 150°C (Max)

BAW78DE6327HTSA1 FAQ

1.How can I place an order for BAW78DE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BAW78DE6327HTSA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BAW78DE6327HTSA1 reliable?

The price and inventory of BAW78DE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAW78DE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BAW78DE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAW78DE6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAW78DE6327HTSA1?

BAW78DE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAW78DE6327HTSA1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BAW78DE6327HTSA1?

For technical support, including BAW78DE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAW78DE6327HTSA1 requirements.

6.How does Aetrix verify that BAW78DE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BAW78DE6327HTSA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BAW78DE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BAW78DE6327HTSA1?

All BAW78DE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BAW78DE6327HTSA1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BAW78DE6327HTSA1 part is unused and in its original packaging.

Return procedure for BAW78DE6327HTSA1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…