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Diodes Incorporated SBM340-13-F
- Part No.:
- SBM340-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- Powermite®3
- Datasheet:
-
SBM340-13-F.pdf
- Description:
- DIODE SCHOTTKY 40V 3A POWERMITE3
- Quantity:
- Payment:
- Shipping:
Inventory:3,261
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Product details
Overview
SBM340-13-F from Diodes Incorporated is a 3A, 40V surface-mount Schottky barrier rectifier in the POWERMITE®3 package, featuring low forward voltage (0.46 V at 3 A, 25°C), low thermal resistance (3.4°C/W junction-to-soldering point), and guard ring die construction for transient protection. It is designed for low-voltage, high-frequency inverters, freewheeling diode applications, and polarity protection circuits in DC/DC converters and power supplies.
For engineers reviewing the SBM340-13-F datasheet, SBM340-13-F pinout, SBM340-13-F application, or SBM340-13-F equivalent, key selection criteria include its 40 V reverse voltage rating, 3 A average forward current capability, 50 A non-repetitive surge current tolerance, thermal performance on GETEK substrates, and RoHS-compliant matte tin plating.
Technical Context
This Schottky rectifier uses a guard ring die structure to enhance transient robustness and reduce leakage under high dv/dt conditions. Its low forward voltage drop minimizes conduction losses in high-efficiency 3.3 V–12 V output stages, while its 180 pF junction capacitance supports operation up to several MHz in switching regulator freewheel paths.
The device is rated for continuous operation from –55°C to +125°C junction temperature and requires PCB-level thermal management via direct cathode pad connection (Pins 1 & 2 electrically joined on board) and bottom-side heatsinking (Pin 3). Derating curves confirm stable 3 A DC current delivery up to 75°C ambient on optimized substrates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; defines safe blocking range in 12 V–24 V bus polarity protection |
| IO | 3 A - Average rectified output current at TC = 100°C; usable for continuous 2.5 A loads at 85°C ambient with proper layout |
| VFM | 0.46 V @ 3 A, 25°C - Low conduction loss enables >92% efficiency in synchronous-buck catch diode roles |
| RθJS | 3.4 °C/W - Junction-to-soldering-point thermal resistance; enables 1.2 W dissipation with ≤4°C rise above solder point |
| IFSM | 50 A - Non-repetitive surge rating for 8.3 ms half-sine; withstands typical switch-mode power supply turn-on transients |
| CT | 180 pF @ 1 MHz, 4 V - Low junction capacitance reduces switching loss and EMI in high-frequency (>100 kHz) topologies |
Pinout & Package
Package: POWERMITE®3 - Molded plastic case (UL 94V-0), 0.072 g mass, moisture sensitivity Level 1, lead-free matte tin plating, bottom-side heatsink terminal (Pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Main anode connection; must be electrically tied to Pin 2 on PCB per datasheet requirement |
| Pin 2 | Anode (redundant) | Second anode terminal; mandatory PCB short to Pin 1 for rated current and thermal path integrity |
| Pin 3 | Cathode / Heatsink | Primary cathode output and thermal interface; soldered directly to copper pour for junction cooling |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves ESD and dv/dt immunity without increasing leakage; validated per JEDEC A114-B for transient robustness |
| Low VFM (0.46 V @ 3 A) | Reduces forward power loss by ≥35% vs. standard silicon rectifiers; critical for thermally constrained DC/DC modules |
| Bottom-side heatsink (Pin 3) | Enables direct thermal coupling to PCB ground plane; achieves RθJS = 3.4°C/W without external heatsink |
| RoHS-compliant matte tin finish | Ensures reliable solderability and intermetallic formation with SnAgCu reflow profiles; meets IPC-J-STD-006B |
Applications
| DC/DC Converter Freewheel Diode | 12 V Automotive Polarity Protection |
|---|---|
Use Scenario: Used as catch diode in non-synchronous buck converters delivering 3.3 V/5 V from 12 V input. IC Role / Device Role: Freewheeling path for inductor current during high-side FET off-time; handles 3 A continuous reverse recovery–free conduction. Use Value: 0.46 V forward drop limits power loss to <1.4 W, enabling compact 0.5" × 0.5" layout without forced air cooling. | Use Scenario: Installed in series with battery feed to protect infotainment ECUs against reverse battery connection. IC Role / Device Role: Unidirectional blocking element; clamps reverse voltage to <0.5 V while passing 3 A forward load current. Use Value: 40 V VRRM exceeds automotive load dump spikes (ISO 7637-2 Pulse 5a); guard ring prevents latch-up during jump-start transients. |
| High-Frequency Inverter Output | Industrial PLC Power Input Stage |
Use Scenario: Output rectification in 200 kHz resonant LLC inverters powering LED drivers. IC Role / Device Role: High-speed unidirectional current path; operates with minimal stored charge due to Schottky physics. Use Value: 180 pF capacitance and zero reverse recovery time eliminate switching tail loss, improving system efficiency by 1.2% at full load. | Use Scenario: Input polarity guard and EMI filter clamp in 24 V DC-powered programmable logic controllers. IC Role / Device Role: Dual-function component: blocks reverse polarity and absorbs line transients via guard ring structure. Use Value: Rated for –55°C to +125°C operation; maintains <20 µA IR at 100°C, ensuring reliability in enclosed control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PDS340-13-F | Direct replacement per Diodes Inc. obsolescence notice; identical POWERMITE®3 package, same 40 V/3 A ratings, improved IR spec (max 10 µA @ 25°C) | Drop-in compatible; no layout or thermal redesign needed; supports same freewheeling and polarity protection use cases | Select when new design or BOM refresh allows migration from obsolete SBM340; ensures long-term supply continuity |
| SS34H-TP | Different package (DO-214AC/SMA); 40 V/3 A rating but higher VFM (0.55 V typ @ 3 A) and RθJA ≈ 50°C/W (vs. 3.4°C/W RθJS) | Limited to lower-power or naturally cooled applications; unsuitable for high-density thermal designs requiring bottom-side heatsinking | Acceptable only if PCB layout cannot accommodate POWERMITE®3 footprint and thermal constraints are relaxed |
Compared with SBM340-13-F, PDS340-13-F offers identical form-fit-function with tighter leakage control, while SS34H-TP trades thermal performance and package compatibility for broader distributor availability in legacy SMA formats.
Availability
SBM340-13-F is available at Aetrix Electronics and suitable for DC/DC converter freewheeling, automotive polarity protection, and industrial PLC power input stages requiring stable component supply despite its obsolete status.
Supply support for SBM340-13-F 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 POWERMITE®3 Schottky rectifier product line targets high-efficiency, space-constrained power conversion systems where low VFM, integrated thermal management, and transient-hardened die structures are essential.
FAQ
Is SBM340-13-F still in production?
No - Diodes Incorporated officially discontinued SBM340-13-F and recommends PDS340-13-F as its direct replacement. Aetrix Electronics holds limited legacy stock for last-time buy and repair scenarios, with full traceability and date-code verification.
Why must Pins 1 and 2 be connected on the PCB?
Pins 1 and 2 are both anode terminals internally tied within the POWERMITE®3 package. The datasheet mandates external PCB connection to ensure current sharing and prevent localized overheating or bond-wire fusing under 3 A continuous load.
Can SBM340-13-F replace a standard PN-junction rectifier in a 24 V supply?
Yes - its 40 V VRRM and 3 A IO rating suit 24 V systems, but its Schottky advantages (zero reverse recovery, 0.46 V VFM) deliver measurable efficiency gains over PN rectifiers, especially above 50 kHz switching frequencies.
What is the role of Pin 3 beyond cathode connection?
Pin 3 serves as both the cathode electrical terminal and the primary thermal interface. Its exposed copper pad must be soldered to a large PCB copper area to realize the specified 3.4°C/W RθJS; omitting this compromises current rating and long-term reliability.
SBM340-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- Powermite®3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 40 V
- Capacitance @ Vr, F:
- 180pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Powermite 3
- Operating Temperature - Junction:
- -55°C ~ 125°C
SBM340-13-F FAQ
1.How can I place an order for SBM340-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SBM340-13-F 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 SBM340-13-F reliable?
The price and inventory of SBM340-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBM340-13-F is usually 5 days.
3.What payment methods are accepted for SBM340-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBM340-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBM340-13-F?
SBM340-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBM340-13-F 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 SBM340-13-F?
For technical support, including SBM340-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBM340-13-F requirements.
6.How does Aetrix verify that SBM340-13-F is sourced from the original manufacturer or authorized distributors?
All SBM340-13-F 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 SBM340-13-F meets industry standards.
7.What is the process for return or replacement of SBM340-13-F?
All SBM340-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SBM340-13-F, 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 SBM340-13-F part is unused and in its original packaging.
Return procedure for SBM340-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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