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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

Vishay General Semiconductor - Diodes Division 301CNQ040

Name: 301CNQ040
Brand: Vishay General Semiconductor - Diodes Division
SKU: 301CNQ040
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 301CNQ040

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Diode Arrays

Package:: TO-244AB

Datasheet:: 301CNQ040.pdf

Description:: DIODE MOD SCHOT 40V 300A TO244AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

301CNQ040 from Infineon Technologies is a center-tap Schottky rectifier module rated for 40 V DC reverse voltage, 300 A average forward current (rectangular waveform, 50% duty cycle at T_C = 81 °C), and 16,000 A non-repetitive surge current per leg. It features low forward voltage drop (0.59 V @ 150 A, T_J = 125 °C), 175 °C maximum junction temperature, and TO-244AB package with common cathode configuration-designed for high-current industrial switching power supplies.

For engineers reviewing the 301CNQ040 datasheet, 301CNQ040 pinout, 301CNQ040 application, or 301CNQ040 equivalent, key selection criteria include its per-leg thermal resistance (0.40 °C/W junction-to-case), 10 mA max reverse leakage at 25 °C, 5200 pF junction capacitance, rugged guard-ring construction, and suitability for reverse battery protection and UPS systems requiring high-temperature reliability.

Technical Context

This device is a dual-anode, single-common-cathode Schottky rectifier module optimized for high-current, high-temperature operation. Its proprietary barrier technology enables stable performance up to 175 °C junction temperature while maintaining low V_F and low I_R, critical for efficiency in plating supplies and welding inverters.

The TO-244AB package integrates two symmetrical Schottky legs sharing one cathode terminal, with mechanical design supporting high thermal conductivity (R_thCS = 0.10 °C/W to greased heatsink) and robust mounting (24–35 kg·cm base torque). dv/dt rating of 10,000 V/µs supports fast-switching topologies without parasitic turn-on.

Key Specifications

Parameter	Value and Actual Design Meaning
V_R	40 V DC reverse voltage rating - defines maximum blocking capability in DC-link or freewheeling paths
I_F(AV)	300 A average forward current - supports high-power converters operating at 50% duty cycle with case temp ≤ 81 °C
V_F	0.59 V @ 150 A, T_J = 125 °C - enables low conduction loss and reduced heatsink requirements
I_FSM	16,000 A peak surge (5 µs sine) per leg - withstands short-circuit transients in UPS and welder output stages
T_J range	−55 to +175 °C - allows deployment in under-hood automotive auxiliary supplies or industrial furnace controls
R_thJC (per leg)	0.40 °C/W - determines thermal headroom when derating for ambient and heatsink conditions
C_T	5200 pF @ 5 V, 25 °C - impacts high-frequency switching losses and EMI filter sizing in >20 kHz converters

Pinout & Package

Package: TO-244AB - modified JEDEC outline, high-purity epoxy encapsulation, 3-terminal metal baseplate with slotted hex mounting hole (1/4-20), designed for direct heatsink attachment and mechanical ruggedness in high-vibration environments.

Pin/Terminal	Circuit Role	Design Meaning
ANODE 1	First Schottky anode	Connects to positive side of first half-bridge leg or input phase in dual-phase rectification
ANODE 2	Second Schottky anode	Connects to positive side of second half-bridge leg or complementary input phase
COMMON CATHODE	Shared cathode node	Output node for center-tapped full-wave rectification; carries full load current sum of both legs

Key Features

Feature	Design Value
Guard ring structure	Enhances edge termination ruggedness, enabling reliable operation under repetitive avalanche stress (I_AR = 30 A)
High-temp epoxy encapsulation	Provides moisture resistance and mechanical integrity up to 175 °C junction temperature
Low series inductance	7.0 nH per leg - minimizes voltage overshoot during di/dt transitions in high-frequency converters
Center-tap symmetry	Matched electrical characteristics between ANODE 1 and ANODE 2 ensure balanced current sharing in dual-leg designs

Applications

High-Current Switching Power Supplies	Uninterruptible Power Systems (UPS)
Use Scenario: Primary-side rectification in 10–50 kW telecom rectifiers with forced-air cooling and 20–100 kHz switching frequency. IC Role / Device Role / Timing Role: Center-tapped Schottky rectifier providing low-loss AC-to-DC conversion with minimal reverse recovery loss. Use Value: 0.59 V forward drop at 150 A reduces conduction loss by ~15% vs. comparable 45 V parts, improving system efficiency at full load.	Use Scenario: Bidirectional DC-link clamping and battery interface in online double-conversion UPS with 400 V DC bus. IC Role / Device Role / Timing Role: Reverse battery protection and freewheeling path during inverter commutation. Use Value: 175 °C junction rating ensures uninterrupted operation during sustained overload events without thermal shutdown.
Industrial Plating Power Supplies	Resistance Welding Inverters
Use Scenario: High-current DC output stage delivering 5,000–20,000 A at 6–24 V for electroplating tanks. IC Role / Device Role / Timing Role: Low-V_F rectifier in multi-module parallel arrays supplying ripple-free DC. Use Value: 0.40 °C/W R_thJC per leg enables effective thermal management across large-area heatsinks, minimizing hot-spot formation.	Use Scenario: Secondary-side rectification in mid-frequency (1–4 kHz) inverter welders driving 10–50 kA pulses. IC Role / Device Role / Timing Role: Freewheeling diode absorbing inductive energy during electrode release. Use Value: 16,000 A I_FSM rating handles extreme surge currents without bond-wire fusing, ensuring long service life.

High-Current Switching Power Supplies

Uninterruptible Power Systems (UPS)

Use Scenario: Primary-side rectification in 10–50 kW telecom rectifiers with forced-air cooling and 20–100 kHz switching frequency.

IC Role / Device Role / Timing Role: Center-tapped Schottky rectifier providing low-loss AC-to-DC conversion with minimal reverse recovery loss.

Use Value: 0.59 V forward drop at 150 A reduces conduction loss by ~15% vs. comparable 45 V parts, improving system efficiency at full load.

Use Scenario: Bidirectional DC-link clamping and battery interface in online double-conversion UPS with 400 V DC bus.

IC Role / Device Role / Timing Role: Reverse battery protection and freewheeling path during inverter commutation.

Use Value: 175 °C junction rating ensures uninterrupted operation during sustained overload events without thermal shutdown.

Industrial Plating Power Supplies

Resistance Welding Inverters

Use Scenario: High-current DC output stage delivering 5,000–20,000 A at 6–24 V for electroplating tanks.

IC Role / Device Role / Timing Role: Low-V_F rectifier in multi-module parallel arrays supplying ripple-free DC.

Use Value: 0.40 °C/W R_thJC per leg enables effective thermal management across large-area heatsinks, minimizing hot-spot formation.

Use Scenario: Secondary-side rectification in mid-frequency (1–4 kHz) inverter welders driving 10–50 kA pulses.

IC Role / Device Role / Timing Role: Freewheeling diode absorbing inductive energy during electrode release.

Use Value: 16,000 A I_FSM rating handles extreme surge currents without bond-wire fusing, ensuring long service life.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
VSKT130-45	45 V V_R, 130 A I_F(AV) per leg, TO-247AC package, higher V_F (0.72 V @ 100 A)	Lower current capacity; suited for <15 kW systems with tighter space constraints	Select when lower cost and standard TO-247 footprint outweigh need for 300 A rating and center-tap topology
IXYS DSEE2x30-04B	40 V V_R, 300 A I_F(AV), dual-diode module but with isolated cathodes (not common), higher R_thJC (0.55 °C/W)	Requires separate cathode routing; less optimal for center-tapped transformer secondary interfaces	Choose only if circuit topology mandates independent cathode control or legacy board layout compatibility

Compared with VSKT130-45 and DSEE2x30-04B, the 301CNQ040 uniquely combines 300 A rating, common-cathode center-tap configuration, 0.40 °C/W thermal resistance, and 175 °C operation-making it the only option among the three qualified for high-power, high-temperature, transformer-coupled rectification where thermal density and layout simplicity are critical.

Availability

301CNQ040 is available at Aetrix Electronics and suitable for high-current switching power supplies, uninterruptible power systems (UPS), and industrial plating power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 301CNQ040 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 global semiconductor leader headquartered in Munich, Germany, specializing in power semiconductors, microcontrollers, and sensor solutions for industrial, automotive, and energy applications.

The 301CNQ... series was developed specifically for high-efficiency, high-reliability rectification in demanding industrial power systems-emphasizing thermal robustness, surge resilience, and low conduction loss at elevated temperatures.

FAQ

What is the maximum allowable case temperature for continuous operation of the 301CNQ040?

The 301CNQ040 supports continuous operation with case temperature up to 81 °C at full 300 A average forward current (50% duty cycle, rectangular waveform), as specified in Fig. 5 of the datasheet. Derating is required above this temperature to maintain safe junction temperature limits. The 301CNQ040 must not exceed 175 °C junction temperature under any operating condition.

Does the 301CNQ040 have a common cathode or isolated cathodes?

The 301CNQ040 features a true common cathode configuration-both anode terminals share a single cathode terminal, enabling center-tapped transformer full-wave rectification. This is confirmed by the pinout diagram, mechanical drawing, and "COMMON CATHODE" labeling in the official Infineon bulletin PD-2.177 rev. D.

What is the thermal resistance from junction to case for the 301CNQ040 per leg?

The 301CNQ040 has a maximum junction-to-case thermal resistance of 0.40 °C/W per leg under DC operation, as stated in the Thermal-Mechanical Specifications table. This value is critical for calculating temperature rise when designing heatsinks for high-current applications.

Can the 301CNQ040 be used in avalanche mode?

Yes-the 301CNQ040 is rated for repetitive avalanche operation with I_AR = 30 A and non-repetitive avalanche energy E_AS = 202 mJ per leg at T_J = 25 °C. Its guard ring design supports controlled avalanche behavior, making it suitable for inductive clamp and snubberless flyback designs where voltage transients exceed V_R.

What is the reverse leakage current specification for the 301CNQ040 at 125 °C?

At T_J = 125 °C and rated reverse voltage, the 301CNQ040 exhibits a maximum reverse leakage current of 90 mA per leg, as specified in the Electrical Specifications table. This value reflects its optimized barrier technology for high-temperature stability-significantly lower than generic Schottky diodes of similar rating.

301CNQ040 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: -

Package/Case:: TO-244AB

Packaging:: Bulk

Product Status:: Obsolete

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io) (per Diode):: 300A

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 300 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 10 mA @ 40 V

Operating Temperature - Junction:: -55°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: TO-244AB

301CNQ040 FAQ

1.How can I place an order for 301CNQ040 through Aetrix?

Please submit a Request for Quotation (RFQ) for 301CNQ040 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 301CNQ040 reliable?

The price and inventory of 301CNQ040 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 301CNQ040 is usually 5 days.

3.What payment methods are accepted for 301CNQ040?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 301CNQ040 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 301CNQ040?

301CNQ040 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 301CNQ040 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 301CNQ040?

For technical support, including 301CNQ040 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 301CNQ040 requirements.

6.How does Aetrix verify that 301CNQ040 is sourced from the original manufacturer or authorized distributors?

All 301CNQ040 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 301CNQ040 meets industry standards.

7.What is the process for return or replacement of 301CNQ040?

All 301CNQ040 units undergo pre-shipment inspection (PSI). If there is an issue with 301CNQ040, 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 301CNQ040 part is unused and in its original packaging.

Return procedure for 301CNQ040:

1.Submit a request within 90 days.

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

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