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

Diodes Incorporated SBL1645

Name: SBL1645
Brand: Diodes Incorporated
SKU: SBL1645
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SBL1645

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: TO-220-2

Datasheet:: SBL1645.pdf

Description:: DIODE SCHOTTKY 45V 16A TO220AC

Quantity:: RFQ Add To RFQ list

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Inventory:5,262

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Product details

Overview

SBL1645 from Diodes Incorporated is a 16A, 45V Schottky barrier rectifier in TO-220AC package, designed for low-voltage, high-frequency power conversion. It delivers 0.57V forward voltage at 16A/25°C, 275A non-repetitive surge capability, and 3.5°C/W junction-to-case thermal resistance-enabling efficient free-wheeling and polarity protection in DC-DC converters.

For engineers reviewing the SBL1645 datasheet, SBL1645 pinout, SBL1645 application, or SBL1645 equivalent, key selection criteria include its 45V blocking rating, low V_F at rated current, TO-220AC thermal performance, and suitability for 60Hz inductive load rectification with 20% capacitive derating.

Technical Context

This discrete Schottky diode uses guard ring die construction to enhance transient robustness without compromising forward conduction. Its low V_F (0.57V @ 16A) and high I_FSM (275A) support high-efficiency switching in flyback and synchronous rectifier topologies.

The device operates across –65°C to +150°C with 700pF junction capacitance at 4V reverse bias and 1.0mA peak reverse leakage at 25°C-making it suitable for fast-switching, thermally constrained industrial power supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	45 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 48V bus protection circuits.
I_O	16 A @ T_C = 95°C - Continuous average forward current with heatsink; defines minimum heatsink sizing requirement.
V_FM	0.57 V @ I_F = 16A, T_C = 25°C - Low conduction loss enabling >92% efficiency in 12V output converters.
I_FSM	275 A (8.3ms half-sine) - Withstands inrush and short-circuit surges in motor drive freewheeling paths.
R_θJC	3.5 °C/W - Enables direct mounting to heatsink; allows 110°C junction rise at full 16A load with 38.5°C case rise.
C_j	700 pF @ 4V, 1MHz - Limits high-frequency switching noise and EMI in SMPS snubber networks.
I_RM	1.0 mA @ 45V, 25°C - Low leakage preserves battery hold-up time in backup power systems.

Pinout & Package

Package: TO-220AC - Molded plastic case (UL 94V-0), tin-plated terminals, 2.24g weight, mountable in any orientation. Pin 1 = Anode (+), Pin 2 = Cathode (–), metal tab = Anode (electrically connected to Pin 1).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Primary current entry point; electrically tied to metal tab for low-inductance heatsinking and thermal path.
Pin 2	Cathode	Current exit terminal; isolated from tab; requires PCB trace routing for reverse-biased isolation.
Metal Tab	Anode (connected)	Provides mechanical mounting and thermal interface; must be insulated from chassis if cathode-grounded topology is used.

Key Features

Feature	Design Value
Guard ring die construction	Improves ruggedness against voltage transients without increasing forward drop or leakage.
Low V_F at high current	0.57V @ 16A enables <10W conduction loss in 48V→12V buck converters at full load.
High I_FSM/I_O ratio (17:1)	Supports reliable operation during motor startup surges and capacitor charging events.
TO-220AC thermal resistance	3.5°C/W allows 16A continuous operation with ≤50°C heatsink rise above ambient.
RoHS-compliant tin finish	Ensures solderability per MIL-STD-202 Method 208 and eliminates lead-based assembly concerns.

Applications

DC-DC Converter Output Rectification

Automotive Power Supply Freewheeling

Use Scenario: Secondary-side rectification in 12V/24V isolated DC-DC modules for telecom and industrial control.

IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional PN diodes to reduce conduction loss and improve efficiency.

Use Value: 0.57V V_F cuts power loss by ~40% vs. 0.9V silicon diode at 16A, lowering thermal design burden.

Use Scenario: Freewheeling path for brushed DC motors and solenoids in 12V vehicle subsystems.

IC Role / Device Role / Timing Role: Fast-recovery clamping diode absorbing inductive kickback energy during MOSFET turn-off.

Use Value: 275A surge rating handles 10× nominal motor stall current without failure.

Reverse Polarity Protection

Low-Voltage AC/DC Adapter Output Stage

Use Scenario: Input protection in 5–24V wall adapters and PoE-powered devices.

IC Role / Device Role / Timing Role: Series-connected anode-in configuration blocking reverse input connection.

Use Value: 0.57V drop minimizes voltage loss at 10–16A loads, preserving regulated output headroom.

Use Scenario: Output rectification in compact 12V/15V offline adapters with high-frequency transformer.

IC Role / Device Role / Timing Role: High-current, low-loss rectifier in bridge or center-tap configurations.

Use Value: 700pF junction capacitance limits high-frequency ringing and EMI generation at 100kHz+ switching.

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-16CTH04	45V V_RRM, 16A I_O, but higher V_F (0.65V @ 16A) and lower I_FSM (220A).	Less effective in high-surge environments like motor drives; higher conduction loss reduces efficiency.	Prefer SBL1645 where surge margin or thermal performance is critical.
ON Semiconductor MBR1645CT	Dual common-cathode configuration (16A per diode), same V_F (0.57V), but TO-220AB package with isolated tab.	Enables dual-output or interleaved designs; tab isolation simplifies grounding in floating topologies.	Choose MBR1645CT only when dual-diode functionality or isolated tab is required.

Compared with VS-16CTH04 and MBR1645CT, the SBL1645 offers superior surge immunity and identical low V_F in a single-diode, anode-tab configuration-ideal for cost-sensitive, space-constrained freewheeling and polarity protection where tab-to-anode connectivity is acceptable.

Availability

SBL1645 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive freewheeling circuits, and reverse polarity protection requiring stable component supply and long-term industrial availability.

Supply support for SBL1645 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, serving industrial, computing, consumer, and communications markets since 1960.

The SBL16xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for low-loss, high-reliability power conversion in 12–48V systems where thermal management and surge resilience are critical.

FAQ

Is SBL1645 RoHS compliant?

Yes, SBL1645 features a lead-free, RoHS-compliant tin finish per EU Directive Annex Notes 5 and 7, with exemptions for glass and high-temperature solder. Terminal plating meets MIL-STD-202 Method 208 solderability requirements and UL 94V-0 flammability rating.

What is the maximum operating temperature for SBL1645?

The SBL1645 has a specified operating junction temperature range of –65°C to +150°C. At 16A average forward current, case temperature must be limited to 95°C per derating curve (Figure 1), requiring appropriate heatsinking to maintain safe thermal margins.

Can SBL1645 be used in surface-mount designs?

No-SBL1645 is exclusively packaged in through-hole TO-220AC. It lacks SMD-compatible footprint or reflow ratings. For surface-mount alternatives, consider Diodes' APx16xx series in PowerDI5/SO-8 packages, which offer comparable voltage/current ratings with different thermal and layout constraints.

Why is SBL1645 marked "NOT RECOMMENDED FOR NEW DESIGN"?

Diodes Incorporated issued this notice due to planned obsolescence and newer-generation replacements (e.g., enhanced thermal variants or integrated solutions). Existing designs may continue using SBL1645, but new projects should evaluate successors like the SBx1645H series for improved R_θJC or extended lifetime availability.

SBL1645 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-220-2

Packaging:: Tube

Product Status:: Obsolete

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 45 V

Current - Average Rectified (Io):: 16A

Voltage - Forward (Vf) (Max) @ If:: 570 mV @ 16 A

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

Reverse Recovery Time (trr):: -

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

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC

Operating Temperature - Junction:: -65°C ~ 150°C

SBL1645 FAQ

1.How can I place an order for SBL1645 through Aetrix?

Please submit a Request for Quotation (RFQ) for SBL1645 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 SBL1645 reliable?

The price and inventory of SBL1645 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBL1645 is usually 5 days.

3.What payment methods are accepted for SBL1645?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBL1645 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SBL1645?

SBL1645 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SBL1645 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 SBL1645?

For technical support, including SBL1645 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBL1645 requirements.

6.How does Aetrix verify that SBL1645 is sourced from the original manufacturer or authorized distributors?

All SBL1645 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 SBL1645 meets industry standards.

7.What is the process for return or replacement of SBL1645?

All SBL1645 units undergo pre-shipment inspection (PSI). If there is an issue with SBL1645, 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 SBL1645 part is unused and in its original packaging.

Return procedure for SBL1645:

1.Submit a request within 90 days.

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

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