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Vishay General Semiconductor - Diodes Division 40CTQ045
- Part No.:
- 40CTQ045
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
40CTQ045.pdf
- Description:
- DIODE ARR SCHOTT 45V 20A TO2203
- Quantity:
- Payment:
- Shipping:
Inventory:4,625
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Product details
Overview
40CTQ045 from Vishay is a dual common-cathode Schottky rectifier in TO-220AB package, rated 45 V reverse voltage and 2 × 20 A average forward current per leg, with 0.48 V forward voltage at 20 A and 125 °C junction temperature, used in high-efficiency DC/DC converters and reverse battery protection circuits.
For engineers reviewing the 40CTQ045 datasheet, 40CTQ045 pinout, 40CTQ045 application, or 40CTQ045 equivalent, key selection criteria include thermal resistance (RthJC = 2.0 °C/W per leg), low VF at elevated temperature, center-tap dual-leg configuration, and industrial-grade 150 °C TJ rating.
Technical Context
This device integrates two independent Schottky diodes sharing a common cathode terminal, enabling synchronous rectification or dual-output freewheeling in single-ended topologies. Its proprietary barrier technology ensures stable operation up to 150 °C junction temperature while maintaining low VF and moderate IR.
The TO-220AB package provides direct heatsink mounting with 0.50 °C/W typical RthCS, and its center-tap layout supports compact PCB routing for high-current paths. Electrical behavior is characterized by 8.72 mΩ forward slope resistance and 2800 pF junction capacitance per leg at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR | 45 V maximum DC reverse voltage - sets upper limit for blocking capability in buck or flyback secondary-side applications |
| IF(AV) per leg | 20 A average forward current - defines continuous conduction capability per diode under 50 % duty cycle at TC = 116 °C |
| VF @ 20 A, 125 °C | 0.48 V - enables <10 W conduction loss per leg in 400 W converter designs at full load |
| RthJC per leg | 2.0 °C/W - allows 40 °C temperature rise per leg at 20 A with 0.48 V drop, critical for thermal margin estimation |
| IFSM per leg | 1240 A non-repetitive surge - withstands MOSFET turn-off transients in hard-switched PFC stages |
| CT per leg | 2800 pF at 5 V - impacts EMI filtering requirements and switching node ringing in >100 kHz SMPS |
| dV/dt | 10,000 V/µs - supports fast-switching GaN or SiC primary-side drivers without false triggering |
Pinout & Package
TO-220AB package with isolated metal tab (electrically connected to cathode), 3-pin configuration: Pin 1 = Anode 1, Pin 2 = Common Cathode, Pin 3 = Anode 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode of Leg 1 | Connects to transformer secondary or switch node for first output path; requires thermal relief on PCB |
| Pin 2 | Common Cathode | Shared output node for both legs; must be routed with low-inductance copper pour to minimize ground bounce |
| Pin 3 | Anode of Leg 2 | Connects to second transformer winding or independent switch node; symmetrical layout recommended |
Key Features
| Feature | Design Value |
|---|---|
| 150 °C TJ operation | Enables use in sealed industrial enclosures without forced air cooling, extending lifetime under sustained thermal stress |
| Center-tap dual-leg configuration | Reduces component count in dual-output flyback or forward converters by eliminating separate cathode traces |
| 0.48 V VF @ 20 A / 125 °C | Lowers conduction losses by ~15 % vs. comparable 100 V Schottkys, improving efficiency in 12–48 V input systems |
| Guard ring structure | Prevents edge breakdown during voltage transients, increasing reliability in automotive load-dump environments |
| High-purity epoxy encapsulation | Passes 85 °C/85 % RH 1000-hour moisture resistance testing, suitable for humid industrial deployments |
Applications
| AC-DC Adapter Secondary Rectification | Reverse Battery Protection |
|---|---|
Use Scenario: 24 V input AC-DC adapter delivering 5 V/10 A and 12 V/5 A outputs using dual-winding transformer. IC Role / Device Role / Timing Role: Dual-leg Schottky rectifier providing synchronous freewheeling for both outputs with shared cathode return path. Use Value: Reduces total conduction loss by 3.2 W versus discrete diodes, lowering case temperature by 12 °C at full load. | Use Scenario: 24 V vehicle power system where battery may be connected with reverse polarity during service. IC Role / Device Role / Timing Role: Common-cathode diode pair placed in series with each supply rail to block reverse current flow. Use Value: Withstands 1240 A surge during jump-start events and operates reliably at 150 °C under hood temperatures. |
| DC/DC Converter Freewheeling | Industrial Motor Drive Snubber |
Use Scenario: 48 V to 5 V isolated buck converter in programmable logic controller (PLC) power supply. IC Role / Device Role / Timing Role: Freewheeling path for high-side switch during off-time; handles 20 A peak inductor current. Use Value: 0.48 V VF minimizes energy dissipation during 90 % duty-cycle operation, improving light-load efficiency. | Use Scenario: IGBT-based 3-phase motor drive with regenerative braking generating flyback spikes. IC Role / Device Role / Timing Role: Clamping diode across DC bus capacitor to absorb inductive kickback energy. Use Value: 20 mJ avalanche energy rating per leg absorbs repetitive 150 V/10 A transients without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-40CPH045 | Same VR (45 V), same IF(AV) (2 × 20 A), but TO-247AC package; RthJC = 1.5 °C/W per leg | Better thermal performance but larger footprint; requires different heatsink interface | Select when board space permits and junction temperature must stay below 130 °C under 40 A total load |
| ON Semiconductor MBR4045CT | Identical VR (45 V), IF(AV) (2 × 20 A), TO-220AB package; VF = 0.55 V @ 20 A / 125 °C | Higher forward drop increases conduction loss by 1.4 W per leg at full load | Acceptable where cost sensitivity outweighs 0.5 % efficiency penalty and thermal margin is sufficient |
Compared with VS-40CPH045 and MBR4045CT, the 40CTQ045 delivers the lowest VF (0.48 V) in TO-220AB form factor, balancing thermal performance, PCB area, and efficiency for space-constrained industrial power supplies.
Availability
40CTQ045 is available at Aetrix Electronics and suitable for AC-DC adapters, reverse battery protection circuits, and industrial DC/DC converters requiring stable component supply and long-term manufacturing continuity.
Supply support for 40CTQ045 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
Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, passive elements, and sensors, with leadership in power diodes and MOSFETs.
The 40CTQ045 belongs to Vishay's High Power Products Schottky rectifier line, engineered for high-current, high-temperature industrial power conversion where low VF and ruggedness are critical.
FAQ
What is the maximum junction temperature rating for the 40CTQ045?
The 40CTQ045 is rated for continuous operation up to 150 °C junction temperature, validated through accelerated life testing and thermal cycling. This rating enables deployment in sealed enclosures or high-ambient environments like industrial motor drives and automotive under-hood modules without derating. The 40CTQ045 maintains specified VF and leakage performance within this range, supported by its high-purity epoxy encapsulation and guard ring design.
Is the 40CTQ045 pin-compatible with standard TO-220AB footprints?
Yes, the 40CTQ045 uses the industry-standard TO-220AB package with 3.81 mm lead pitch and 2.54 mm mounting hole spacing. Pin 1 (Anode 1), Pin 2 (Common Cathode), and Pin 3 (Anode 2) align with JEDEC TO-220AB mechanical drawings. No PCB redesign is required when replacing other TO-220AB dual-diode rectifiers, provided thermal pad clearance and copper pour match the 40CTQ045's 2 g mass and heatsink interface requirements.
How does the 40CTQ045 perform in reverse battery protection applications?
The 40CTQ045 delivers robust reverse battery protection due to its 45 V VR rating, 1240 A IFSM surge capability, and 150 °C TJ operation. When placed in series with each supply rail, it blocks reverse current while surviving jump-start transients and thermal stress under hood conditions. Its 0.48 V VF at 20 A minimizes voltage drop during normal operation, preserving system efficiency-critical in 24 V vehicle electronics where every millivolt affects regulator headroom.
What is the thermal resistance from junction to case per leg for the 40CTQ045?
The 40CTQ045 has a maximum thermal resistance of 2.0 °C/W from junction to case per leg under DC operation, measured per Vishay Document Number 93340. This value assumes proper mounting torque (6–12 kgf·cm) and thermal interface material between the isolated metal tab and heatsink. It enables accurate junction temperature prediction using TC = TJ − (Pd × RthJC), supporting thermal design validation for continuous 20 A per leg loads in industrial power supplies.
Does the 40CTQ045 have avalanche energy rating, and how is it applied?
Yes, the 40CTQ045 is rated for 20 mJ non-repetitive avalanche energy per leg at TJ = 25 °C with IAS = 3 A and L = 4.4 mH. This rating applies during unclamped inductive switching events, such as IGBT turn-off in motor drives or relay coil de-energization. Engineers use this parameter to size snubbers or verify that transient energy remains within safe limits without causing junction failure-ensuring reliability in harsh industrial environments where inductive loads dominate.
40CTQ045 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io) (per Diode):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 530 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 3 mA @ 45 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
40CTQ045 FAQ
1.How can I place an order for 40CTQ045 through Aetrix?
Please submit a Request for Quotation (RFQ) for 40CTQ045 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 40CTQ045 reliable?
The price and inventory of 40CTQ045 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 40CTQ045 is usually 5 days.
3.What payment methods are accepted for 40CTQ045?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 40CTQ045 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 40CTQ045?
40CTQ045 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 40CTQ045 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 40CTQ045?
For technical support, including 40CTQ045 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 40CTQ045 requirements.
6.How does Aetrix verify that 40CTQ045 is sourced from the original manufacturer or authorized distributors?
All 40CTQ045 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 40CTQ045 meets industry standards.
7.What is the process for return or replacement of 40CTQ045?
All 40CTQ045 units undergo pre-shipment inspection (PSI). If there is an issue with 40CTQ045, 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 40CTQ045 part is unused and in its original packaging.
Return procedure for 40CTQ045:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
40CTQ045 Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
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