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

Diodes Incorporated SBL4045PT

Name: SBL4045PT
Brand: Diodes Incorporated
SKU: SBL4045PT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SBL4045PT

Manufacturer:: Diodes Incorporated

Category:: Diode Arrays

Package:: TO-3P-3, SC-65-3

Datasheet:: SBL4045PT.pdf

Description:: DIODE ARRAY SCHOTT 45V 40A TO-3P

Quantity:: RFQ Add To RFQ list

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Inventory:3,276

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Product details

Overview

SBL4045PT from Diodes Incorporated is a 40A, 45V Schottky barrier rectifier in TO-3P package, featuring low forward voltage drop (0.70 V @ 20 A, 25°C), high surge capability (375 A, 8.3 ms), and thermal resistance of 1.4°C/W - designed for low-voltage, high-frequency inverters, freewheeling diodes, and polarity protection circuits.

For engineers reviewing the SBL4045PT datasheet, SBL4045PT pinout, SBL4045PT application, or SBL4045PT equivalent, key selection criteria include peak repetitive reverse voltage (45 V), average rectified current at TC = 100°C (40 A), forward voltage drop under load, junction-to-case thermal resistance, and RoHS-compliant tin-plated leads for reliable solderability.

Technical Context

This Schottky rectifier uses guard ring die construction to enhance transient protection and reduce leakage. Its low V_F and high I_O support efficient power conversion in DC-DC stages and output rectification where conduction losses must be minimized.

The device operates across –55°C to +125°C junction temperature range and exhibits 800 pF typical junction capacitance at 1 MHz/4 V reverse bias - critical for high-frequency switching noise and EMI considerations in SMPS and solar microinverters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	45 V - maximum repetitive reverse blocking voltage; defines safe operating limit in polarity protection and flyback clamp circuits
I_O @ T_C = 100°C	40 A - continuous average forward current with heatsink; sets minimum heatsink sizing for 100°C case operation
V_FM @ I_F = 20 A	0.70 V - forward voltage at rated test current; directly determines conduction loss (14 W @ 20 A)
I_FSM	375 A - non-repetitive surge rating (8.3 ms half-sine); supports motor startup and capacitor-charging transients
R_JC	1.4 °C/W - thermal resistance junction-to-case; enables calculation of junction temperature rise under given power dissipation
C_T @ 1 MHz	800 pF - junction capacitance at 4 V reverse bias; impacts switching speed and high-frequency ringing in hard-switched topologies

Pinout & Package

TO-3P package: insulated plastic case with three leads - anode, cathode, and case-connected tab (cathode common). Mounting tab is electrically connected to cathode terminal and requires isolation when used on grounded heatsinks.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Current entry point during forward conduction	Connected to source side in freewheeling path or input rail in polarity protection
Cathode (Lead 2 & Tab)	Current exit point; electrically tied to metal tab	Tab must be isolated from chassis unless circuit ground is cathode-referenced
Case Tab	Thermal and electrical extension of cathode	Provides primary heat path to heatsink; requires insulating washer if mounting to conductive surface

Key Features

Feature	Design Value
Guard ring die construction	Improves transient immunity and reduces IR drift under voltage stress
Low V_F (0.70 V @ 20 A)	Reduces conduction loss by ~30% vs. comparable silicon rectifiers, lowering thermal load
High I_FSM (375 A)	Withstands short-duration overloads without degradation - suitable for motor drive snubbers
RoHS-compliant tin plating	Ensures consistent solder wetting and reliability per MIL-STD-202 Method 208

Applications

Motor Drive Freewheeling

Solar Microinverter Output Rectification

Use Scenario: Bidirectional current flow during PWM-controlled DC motor commutation.

IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback across H-bridge legs.

Use Value: Low V_F minimizes power loss during extended conduction periods; 375 A I_FSM handles stall-current surges.

Use Scenario: High-frequency AC-to-DC conversion in transformerless solar inverters.

IC Role / Device Role / Timing Role: Synchronous rectification replacement in secondary-side output stage.

Use Value: 800 pF C_T and fast recovery enable clean zero-crossing behavior at 20–50 kHz switching frequencies.

Industrial Power Supply Polarity Protection

Telecom DC-DC Converter Output Stage

Use Scenario: Reverse-voltage safeguard on 12 V/24 V/48 V input rails feeding PLC modules.

IC Role / Device Role / Timing Role: Series-blocking diode preventing damage from miswired inputs.

Use Value: 45 V V_RRM provides margin above nominal bus; 40 A rating supports hot-swap capable backplanes.

Use Scenario: Secondary-side rectification in isolated 48 V–12 V telecom DC-DC bricks.

IC Role / Device Role / Timing Role: Main output rectifier handling continuous 30–40 A load currents.

Use Value: 1.4 °C/W R_JC allows compact heatsinking; TO-3P mechanical robustness withstands board-level vibration.

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 45 V V_RRM, 40 A I_O, but TO-247AC package; R_JC = 1.2°C/W, V_F = 0.69 V @ 20 A	Higher thermal performance, but larger footprint and different mounting hole pattern	Select for improved thermal margin where PCB space permits TO-247 layout
ON Semiconductor MBR4045CT	45 V, dual common-cathode configuration (2 × 20 A), TO-220AB package; V_F = 0.72 V @ 20 A per diode	Enables interleaved or redundant rectification; not single-diode drop-in	Choose when dual-diode topology or cost-sensitive TO-220 sourcing is required

Compared with VS-40CPH045 and MBR4045CT, the SBL4045PT offers optimized TO-3P mechanical stability and standardized 30/unit tube packaging - advantageous for automated insertion and industrial field-replaceable designs despite slightly higher R_JC.

Availability

SBL4045PT is available at Aetrix Electronics and suitable for industrial motor drives, solar microinverters, telecom DC-DC converters, and PLC power input stages requiring stable component supply despite its obsolete status.

Supply support for SBL4045PT 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 Americas.

The SBL40xxPT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, high-reliability power conversion in industrial and renewable energy systems.

FAQ

Is SBL4045PT still in active production?

No - Diodes Incorporated officially discontinued the SBL4045PT as of July 2015 (DS30236 Rev. 4). It is marked "OBSOLETE – PART DISCONTINUED" in all official documentation. Aetrix Electronics maintains limited legacy stock with full traceability and supports last-time buys for ongoing production programs.

What is the correct mounting orientation for the TO-3P tab?

The metal tab is electrically connected to the cathode. When mounted to a heatsink, use an isolating pad (e.g., mica or silicone) unless the heatsink is floating or referenced to cathode potential. Mechanical torque must not exceed 0.5 N·m to avoid lead fracture or die damage.

Can SBL4045PT replace SBL4040PT in existing designs?

Yes - both share identical TO-3P package, pinout, and thermal characteristics. The only difference is V_RRM: 45 V vs. 40 V. Substitution is safe if system reverse voltage never exceeds 40 V; otherwise, the higher rating provides additional margin against transients and derating.

Does SBL4045PT require derating for capacitive loads?

Yes - per datasheet Note 1, average current must be derated by 20% when used with capacitive loads due to higher peak charging currents. For example, maximum usable I_O drops from 40 A to 32 A at T_C = 100°C under capacitive conditions.

SBL4045PT 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):: 45 V

Current - Average Rectified (Io) (per Diode):: 40A

Voltage - Forward (Vf) (Max) @ If:: 580 mV @ 20 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 mA @ 45 V

Operating Temperature - Junction:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3P

SBL4045PT FAQ

1.How can I place an order for SBL4045PT through Aetrix?

Please submit a Request for Quotation (RFQ) for SBL4045PT 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 SBL4045PT reliable?

The price and inventory of SBL4045PT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBL4045PT is usually 5 days.

3.What payment methods are accepted for SBL4045PT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBL4045PT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SBL4045PT?

SBL4045PT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SBL4045PT 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 SBL4045PT?

For technical support, including SBL4045PT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBL4045PT requirements.

6.How does Aetrix verify that SBL4045PT is sourced from the original manufacturer or authorized distributors?

All SBL4045PT 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 SBL4045PT meets industry standards.

7.What is the process for return or replacement of SBL4045PT?

All SBL4045PT units undergo pre-shipment inspection (PSI). If there is an issue with SBL4045PT, 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 SBL4045PT part is unused and in its original packaging.

Return procedure for SBL4045PT:

1.Submit a request within 90 days.

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

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