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

Taiwan Semiconductor Corporation 31DF6

Name: 31DF6
Brand: Taiwan Semiconductor Corporation
SKU: 31DF6
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 31DF6

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: 31DF6.pdf

Description:: DIODE GEN PURP 600V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:3,637

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Product details

Overview

31DF6 from Taiwan Semiconductor is a 600V, 3A super fast rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 1.7V forward voltage at 3A/25°C, and 45A surge capability - deployed in high-frequency switching mode power supplies and DC-DC converters requiring low-loss freewheeling.

For engineers reviewing the 31DF6 datasheet, 31DF6 pinout, 31DF6 application, or 31DF6 equivalent, key selection criteria include V_RRM = 600V, I_F = 3A, t_rr ≤ 35ns, thermal resistance R_θJA = 80°C/W, and DO-201AD mechanical compatibility with standard through-hole or tape-and-reel assembly.

Technical Context

This single-die, unidirectional super fast rectifier operates with soft recovery characteristics optimized for reduced EMI in high-frequency SMPS topologies. Its 600V V_RRM rating supports 420V RMS input stages, while the 35ns t_rr enables efficient operation up to ~100 kHz switching frequencies without excessive switching loss.

The device uses pure tin-plated leads compliant with J-STD-002 solderability and meets JESD 201 Class 1A whisker resistance. Junction temperature range is −55°C to +150°C, with derating beginning at 25°C ambient per the published forward current curve.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - Maximum repetitive reverse blocking voltage; defines maximum DC bus or AC peak voltage the diode can withstand without breakdown
I_F	3 A - Continuous average forward current at T_A = 25°C; usable up to ~1.8 A at 70°C ambient with standard PCB copper area
t_rr	≤ 35 ns - Reverse recovery time under IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables low-loss operation in 50–100 kHz hard-switched converters
V_F	1.7 V @ 3A, 25°C - Forward voltage drop; determines conduction loss (P_cond ≈ 5.1 W at full load)
R_θJA	80 °C/W - Junction-to-ambient thermal resistance; requires ≥ 1.5 cm² of 1 oz copper pad for safe 3A operation at 70°C ambient
I_FSM	45 A - Non-repetitive surge current (8.3 ms half-sine); supports inrush and transient overload handling in offline SMPS inputs

Pinout & Package

DO-201AD axial-leaded package with cathode indicated by a band on the body. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 1A whisker resistance. Polarity is unambiguous: banded end = cathode.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry node	Connected to lower-potential side (e.g., switch node in buck freewheel path or transformer secondary center-tap)
Cathode (banded end)	Forward current exit node / reverse blocking terminal	Connected to higher-potential rail (e.g., output capacitor positive or DC bus); blocks reverse voltage up to 600V

Key Features

Feature	Design Value
Super fast recovery (t_rr ≤ 35 ns)	Reduces switching loss and EMI in 50–100 kHz SMPS, enabling smaller snubbers and lower heatsink requirements
Low V_F = 1.7 V @ 3A	Limits conduction loss to ~5.1 W at full rated current, improving efficiency over standard fast rectifiers (typically >2.0 V)
600 V V_RRM rating	Supports universal-input (85–265 V_AC) offline converters with 420 V_RMS derated input stage
DO-201AD mechanical standard	Enables drop-in replacement in legacy designs using industry-standard axial footprint and lead spacing (5.5–7.0 mm)
RoHS & halogen-free	Complies with IEC 61249-2-21; suitable for consumer, industrial, and telecom equipment with strict material compliance mandates

Applications

Offline AC-DC Adapters	Server PSU Secondary Rectification
Use Scenario: 65–300W universal-input flyback or LLC resonant adapters powering laptops and monitors. IC Role / Device Role / Timing Role: Freewheeling rectifier on transformer secondary, conducting during MOSFET off-time. Use Value: 35ns t_rr minimizes reverse recovery loss and ringing, improving efficiency by ~0.5–1.0% versus standard fast diodes at 65 kHz.	Use Scenario: +12V or +5V synchronous rectification auxiliary rails in multi-output server PSUs. IC Role / Device Role / Timing Role: Output rectifier in non-synchronous secondary stage, handling continuous 3A load with minimal voltage drop. Use Value: 1.7V V_F reduces conduction loss vs. 2.1V alternatives, lowering thermal stress on PCB copper and enabling tighter layout.
Solar Microinverter DC Link	Industrial Motor Drive Snubber
Use Scenario: DC-side clamp and freewheeling in string-level microinverters operating up to 600V DC bus. IC Role / Device Role / Timing Role: Bidirectional clamping diode in active clamp circuits and unidirectional freewheel path in H-bridge outputs. Use Value: 600V V_RRM matches PV string open-circuit voltage; 45A I_FSM handles lightning-induced transients without failure.	Use Scenario: RC snubber network across IGBTs in 3–7.5 kW variable frequency drives. IC Role / Device Role / Timing Role: Fast recovery diode in snubber loop, absorbing turn-off energy and limiting voltage overshoot. Use Value: 35ns t_rr ensures clean energy transfer into the snubber capacitor, reducing IGBT voltage stress and EMI generation.

Offline AC-DC Adapters

Server PSU Secondary Rectification

Use Scenario: 65–300W universal-input flyback or LLC resonant adapters powering laptops and monitors.

IC Role / Device Role / Timing Role: Freewheeling rectifier on transformer secondary, conducting during MOSFET off-time.

Use Value: 35ns t_rr minimizes reverse recovery loss and ringing, improving efficiency by ~0.5–1.0% versus standard fast diodes at 65 kHz.

Use Scenario: +12V or +5V synchronous rectification auxiliary rails in multi-output server PSUs.

IC Role / Device Role / Timing Role: Output rectifier in non-synchronous secondary stage, handling continuous 3A load with minimal voltage drop.

Use Value: 1.7V V_F reduces conduction loss vs. 2.1V alternatives, lowering thermal stress on PCB copper and enabling tighter layout.

Solar Microinverter DC Link

Industrial Motor Drive Snubber

Use Scenario: DC-side clamp and freewheeling in string-level microinverters operating up to 600V DC bus.

IC Role / Device Role / Timing Role: Bidirectional clamping diode in active clamp circuits and unidirectional freewheel path in H-bridge outputs.

Use Value: 600V V_RRM matches PV string open-circuit voltage; 45A I_FSM handles lightning-induced transients without failure.

Use Scenario: RC snubber network across IGBTs in 3–7.5 kW variable frequency drives.

IC Role / Device Role / Timing Role: Fast recovery diode in snubber loop, absorbing turn-off energy and limiting voltage overshoot.

Use Value: 35ns t_rr ensures clean energy transfer into the snubber capacitor, reducing IGBT voltage stress and EMI generation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar super fast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06S	V_RRM = 600V, I_F = 3A, t_rr = 30ns, VF = 1.75V - slightly faster but higher V_F; DO-201AD package	Marginally better EMI performance in >100 kHz designs; identical mounting and thermal profile	Preferred where ultra-low t_rr dominates over conduction loss
ES3J	V_RRM = 600V, I_F = 3A, t_rr = 35ns, V_F = 1.7V - functionally identical specs; same DO-201AD package	No functional difference in SMPS freewheeling or DC-DC output rectification	Valid second-source option with identical electrical and mechanical behavior

Compared with STTH3L06S and ES3J, the 31DF6 offers identical V_RRM, I_F, and t_rr to ES3J but with marginally lower V_F, while differing from STTH3L06S in trade-off between recovery speed and forward loss - making it optimal for cost-sensitive, thermally constrained 50–80 kHz power stages.

Availability

31DF6 is available at Aetrix Electronics and suitable for offline AC-DC adapters, server PSU secondary rectification, and solar microinverter DC link applications requiring stable component supply, RoHS-compliant packaging, and proven 600V/3A super fast rectification performance.

Supply support for 31DF6 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS devices, and MOSFETs for industrial and consumer markets.

The 31DFx series was designed specifically for high-efficiency, high-reliability switching power supplies - emphasizing low V_F, fast t_rr, and robust surge capability in standard DO-201AD packaging.

FAQ

What is the maximum junction temperature rating for the 31DF6?

The 31DF6 has a maximum junction temperature (T_J) rating of +150°C, with an operational range from −55°C to +150°C. This allows reliable use in enclosed power supplies and industrial environments where ambient temperatures exceed 70°C, provided thermal design maintains junction temperature below this limit using the specified R_θJA = 80°C/W and adequate copper area.

Does the 31DF6 support RoHS and halogen-free compliance?

Yes, the 31DF6 is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and the pure tin-plated leads satisfy J-STD-002 solderability and JESD 201 Class 1A whisker resistance - confirming suitability for environmentally regulated consumer and telecom applications.

What is the reverse recovery time (t_rr) test condition for the 31DF6?

The 31DF6 reverse recovery time is measured under IF = 0.5A, IR = 1.0A, and Irr = 0.25A, yielding a maximum t_rr of 35 ns. This condition reflects real-world hard-switching behavior in SMPS freewheel paths and ensures predictable EMI and loss performance when replacing slower rectifiers in existing 50–100 kHz designs.

Can the 31DF6 replace the 31DF4 in a design?

Yes, the 31DF6 is mechanically and electrically compatible with the 31DF4 (same DO-201AD package, 3A rating, and 35ns t_rr), but offers higher V_RRM (600V vs. 400V). It can directly replace the 31DF4 where increased reverse voltage margin is needed - e.g., upgrading a 265V_AC input design to handle 305V_AC transients - without layout or thermal changes.

What packaging options are available for the 31DF6?

The 31DF6 is supplied in two standard configurations: 1,250 units per 12mm tape-and-reel (ordering code 31DF6) and 500 units per ammo box (ordering code 31DF6 A0G). Both use the DO-201AD axial package with cathode band marking, pure tin-plated leads, and green molding compound compliant with UL 94V-0.

31DF6 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 600 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 20 µA @ 600 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

Operating Temperature - Junction:: -40°C ~ 150°C

31DF6 FAQ

1.How can I place an order for 31DF6 through Aetrix?

Please submit a Request for Quotation (RFQ) for 31DF6 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 31DF6 reliable?

The price and inventory of 31DF6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 31DF6 is usually 5 days.

3.What payment methods are accepted for 31DF6?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 31DF6 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 31DF6?

31DF6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 31DF6 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 31DF6?

For technical support, including 31DF6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 31DF6 requirements.

6.How does Aetrix verify that 31DF6 is sourced from the original manufacturer or authorized distributors?

All 31DF6 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 31DF6 meets industry standards.

7.What is the process for return or replacement of 31DF6?

All 31DF6 units undergo pre-shipment inspection (PSI). If there is an issue with 31DF6, 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 31DF6 part is unused and in its original packaging.

Return procedure for 31DF6:

1.Submit a request within 90 days.

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

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