My Inquiry
My Account
Diodes Incorporated MBR4040PT
- Part No.:
- MBR4040PT
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-3P-3, SC-65-3
- Datasheet:
-
MBR4040PT.pdf
- Description:
- DIODE ARRAY SCHOTT 40V 40A TO-3P
- Quantity:
- Payment:
- Shipping:
Inventory:9,792
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MBR4040PT from Diodes Incorporated is a 40A, 40V Schottky barrier rectifier in TO-3P package, featuring low forward voltage drop (0.70 V @ 20A, 25°C), high surge capability (400 A), and thermal resistance of 1.4 °C/W - used for polarity protection and free-wheeling in DC-DC converters and industrial power supplies.
For engineers reviewing the MBR4040PT datasheet, MBR4040PT pinout, MBR4040PT application, or MBR4040PT equivalent, key selection criteria include peak reverse voltage rating, forward voltage at operating current, thermal resistance, surge current handling, and RoHS-compliant tin-plated leads for lead-free assembly.
Technical Context
This device employs Schottky barrier chip construction with guard ring die design to suppress transient-induced failure. It operates as a unidirectional, single-phase half-wave rectifier optimized for low-voltage, high-frequency switching applications where conduction loss minimization is critical.
Rated for 40A average output current at TC = 125°C with derating required for capacitive loads (−20% current), it delivers 1100 pF typical junction capacitance at 1 MHz and 4 V reverse bias, supporting fast switching in SMPS and inverters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe DC/AC peak reverse operating limit. |
| IO @ TC=125°C | 40 A - Continuous average forward current when case temperature is held at 125°C using heatsink. |
| VFM @ 20A, 25°C | 0.70 V - Forward voltage drop determines conduction loss; enables <1.4 W dissipation per diode at 20A. |
| IFSM (8.3ms) | 400 A - Non-repetitive surge rating; supports motor-start and capacitor-charging transients without failure. |
| RJC | 1.4 °C/W - Junction-to-case thermal resistance; requires heatsink interface ≤0.5 °C/W to maintain Tj ≤150°C at full load. |
| IRM @ 40V, 25°C | 1.0 mA - Reverse leakage at rated voltage; low value preserves efficiency in high-impedance hold-up circuits. |
| CT @ 1MHz, 4V | 1100 pF - Junction capacitance affects high-frequency switching loss and EMI behavior in hard-switched topologies. |
Pinout & Package
TO-3P package: isolated metal tab (cathode), three leads (anode, cathode, cathode) - dual common-cathode configuration with center anode and outer cathodes. Mounting via insulated screw through central hole; tab electrically connected to cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Center Lead | Anode | Main current entry point; connects to input/source side of rectification path. |
| Left Outer Lead | Cathode | Common cathode terminal; ties to output/load return and heatsink mounting surface. |
| Right Outer Lead | Cathode | Second cathode terminal; enables parallel connection or dual-output configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses edge breakdown during voltage transients, improving reliability in noisy industrial environments. |
| Low VFM at high current | 0.70 V @ 20A, 25°C reduces conduction loss by ~30% vs. comparable silicon rectifiers, lowering thermal load. |
| High IFSM rating | 400 A surge capacity supports inrush-limited designs without external fusing in many 48V systems. |
| RoHS-compliant tin plating | Bright tin finish ensures solderability per MIL-STD-202 Method 208 and compatibility with lead-free reflow profiles. |
| UL 94V-0 molded case | Flame-retardant plastic housing meets safety standards for enclosed power equipment and industrial enclosures. |
Applications
| Industrial DC Power Supply | Automotive DC-DC Converter |
|---|---|
Use Scenario: Rectifying 24–48 V AC-derived or switched inputs in DIN-rail mounted PSUs. IC Role / Device Role / Timing Role: Primary output rectifier in synchronous or non-synchronous buck-derived topologies. Use Value: Low VFM minimizes heat generation at 30–40 A loads, reducing heatsink size and system footprint. | Use Scenario: Polarity protection and reverse-battery safeguard in 12 V/24 V vehicle electronics. IC Role / Device Role / Timing Role: Bidirectional blocking element placed between battery and load. Use Value: 400 A IFSM withstands jump-start surges; 40 V VRRM covers alternator overvoltage events up to 35 V DC. |
| Solar Charge Controller | Uninterruptible Power Module |
Use Scenario: Blocking reverse current from battery to PV array at night in off-grid solar systems. IC Role / Device Role / Timing Role: Anti-backfeed diode in MPPT or PWM charge stages. Use Value: 1.0 mA IRM at 40 V ensures minimal standby drain; TO-3P mechanical robustness suits outdoor mounting. | Use Scenario: Free-wheeling path for relay coils and solenoid drivers in backup power sequencers. IC Role / Device Role / Timing Role: Clamp diode across inductive loads to suppress turn-off voltage spikes. Use Value: Fast recovery (inherent to Schottky) and 1100 pF CT enable clean snubbing without added RC networks. |
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-MBR4040CT | Same 40V/40A rating, but dual common-anode configuration; RJC = 1.5 °C/W. | Requires PCB layout revision due to reversed terminal polarity and slightly higher thermal resistance. | Select if common-anode topology matches existing board design or if Vishay supply chain preference applies. |
| ON Semiconductor MBR4040CT | Identical TO-3P package and electrical specs; minor variation in IRM (1.5 mA vs. 1.0 mA). | No layout change needed; suitable for drop-in replacement where leakage margin allows +0.5 mA. | Prefer when sourcing continuity is prioritized and leakage sensitivity is not critical in the target application. |
Compared with MBR4040PT, VS-MBR4040CT demands layout adaptation for anode-common operation, while MBR4040CT offers direct mechanical and electrical compatibility with negligible leakage trade-off - making it the most seamless alternative for legacy designs.
Availability
MBR4040PT is available at Aetrix Electronics and suitable for industrial DC power supplies, automotive battery protection circuits, solar charge controllers, and uninterruptible power modules requiring stable component supply despite its obsolete status.
Supply support for MBR4040PT 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the US.
The MBR40xxPT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for low-loss, high-efficiency power conversion in industrial, computing, and transportation systems.
FAQ
Is MBR4040PT still in production?
No - Diodes Incorporated has marked MBR4040PT as obsolete and discontinued per DS23019 Rev. 9 (July 2015). Aetrix Electronics maintains limited legacy stock and supports last-time buys with full traceability and documentation for ongoing production needs.
What is the correct pin configuration for TO-3P in MBR4040PT?
The TO-3P package uses a center-anode, dual-cathode layout: center lead is anode; left and right outer leads are both cathodes tied internally to the metal tab. The tab itself is electrically connected to cathode and must be insulated from chassis unless referenced to system ground.
Can MBR4040PT replace MBR4035PT or MBR4045PT in existing designs?
Yes - all MBR40xxPT devices share identical TO-3P packaging, thermal characteristics, and pinout. Substituting MBR4040PT for MBR4035PT (35 V) increases reverse voltage margin; replacing MBR4045PT (45 V) reduces VRRM by 5 V - verify system peak reverse stress remains below 40 V before substitution.
Does MBR4040PT require a heatsink in all applications?
Yes - at rated 40 A average current, junction temperature exceeds safe limits without heatsinking. Even at 20 A, thermal simulation shows Tj > 125°C with RJC = 1.4 °C/W and ambient > 50°C; a minimum 0.5 °C/W heatsink interface is required for continuous operation at full rating.
MBR4040PT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-3P-3, SC-65-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io) (per Diode):
- 40A
- Voltage - Forward (Vf) (Max) @ If:
- 700 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 40 V
- Operating Temperature - Junction:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3P
MBR4040PT FAQ
1.How can I place an order for MBR4040PT through Aetrix?
Please submit a Request for Quotation (RFQ) for MBR4040PT 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 MBR4040PT reliable?
The price and inventory of MBR4040PT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MBR4040PT is usually 5 days.
3.What payment methods are accepted for MBR4040PT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MBR4040PT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MBR4040PT?
MBR4040PT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MBR4040PT 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 MBR4040PT?
For technical support, including MBR4040PT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MBR4040PT requirements.
6.How does Aetrix verify that MBR4040PT is sourced from the original manufacturer or authorized distributors?
All MBR4040PT 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 MBR4040PT meets industry standards.
7.What is the process for return or replacement of MBR4040PT?
All MBR4040PT units undergo pre-shipment inspection (PSI). If there is an issue with MBR4040PT, 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 MBR4040PT part is unused and in its original packaging.
Return procedure for MBR4040PT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MBR4040PT 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
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
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.…
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…
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…
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…
