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Diodes Incorporated B320B-13
- Part No.:
- B320B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
B320B-13.pdf
- Description:
- DIODE SCHOTTKY 20V 3A SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,705
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Product details
Overview
B320B-13 from Diodes Incorporated is a 3.0A surface-mount Schottky barrier rectifier in SMB package, rated for 20V peak repetitive reverse voltage (VRRM), 0.50V forward voltage at 3.0A (VFM), and 100A non-repetitive surge current (IFSM); used for low-voltage polarity protection and free-wheeling in DC-DC converters.
For engineers reviewing the B320B-13 datasheet, B320B-13 pinout, B320B-13 application, or B320B-13 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (RJT = 10°C/W), surge capability, RoHS-compliant matte tin plating, and SMB package footprint compatibility with automated assembly.
Technical Context
This Schottky rectifier employs guard ring die construction to enhance transient protection and withstand repetitive voltage spikes in switching power supplies. Its low VFM (0.50V @ 3.0A) and high IFSM (100A) support efficient energy recovery in flyback and buck converter freewheeling paths.
Thermal performance is defined by RJT = 10°C/W (junction-to-terminal) when mounted on a 5.0 mm² copper pad, enabling reliable operation up to +125°C junction temperature. Capacitance is 250 pF at 1 MHz and 4.0V reverse bias, suitable for high-frequency rectification below 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum peak reverse voltage before breakdown; sets safe operating limit in 12V rail polarity protection. |
| IO @ TT=100°C | 3.0 A - Continuous average forward current with terminal temperature held at 100°C; defines steady-state power handling. |
| VFM @ IF=3.0A | 0.50 V - Forward voltage drop at full rated current; directly determines conduction loss (1.5W at 3A). |
| IFSM (8.3ms) | 100 A - Non-repetitive surge rating; supports inrush and fault-current tolerance in DC-DC output stages. |
| RJT | 10 °C/W - Junction-to-terminal thermal resistance; enables direct PCB copper pad heat sinking without external heatsink. |
| CT @ 1MHz | 250 pF - Junction capacitance at 4V reverse bias; limits high-frequency switching noise and EMI in <1 MHz applications. |
Pinout & Package
SMB package: molded plastic case (UL 94V-0), cathode band marking, matte tin-plated terminals, moisture sensitivity level 1. Dimensions: A = 3.30–3.94 mm, B = 4.06–4.57 mm, C = 1.96–2.21 mm, E = 5.00–5.59 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node in buck converter); requires low-inductance layout. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; connects to output rail; must be routed away from sensitive analog traces due to leakage. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves transient immunity against ESD and line surges without external TVS, reducing BOM count in industrial power rails. |
| Lead-free / RoHS compliant | Matte tin finish meets JEDEC solderability standards and EU Directive Annex exemptions; supports lead-free reflow profiles. |
| Low thermal resistance (RJT = 10°C/W) | Enables direct PCB copper pad heat dissipation-no thermal vias or heatsink required for 3A continuous operation at 100°C ambient. |
| 100A surge rating (JEDEC Method) | Withstands single half-sine 8.3ms overloads common in motor drive flyback and capacitor charging circuits. |
Applications
| DC-DC Converter Freewheeling | 12V Automotive Polarity Protection |
|---|---|
Use Scenario: Used as freewheeling diode in synchronous buck converter output stage, recovering inductive energy during high-side FET off-time. IC Role / Device Role / Timing Role: Schottky rectifier providing low-loss unidirectional current path; replaces body diode of low-side MOSFET to reduce conduction loss. Use Value: 0.50V VFM at 3A cuts conduction loss by ~40% vs. standard PN diode, improving efficiency in 5–12V output converters. | Use Scenario: Placed in series with battery input to prevent damage from reverse battery connection in automotive infotainment modules. IC Role / Device Role / Timing Role: Unidirectional current gate; blocks reverse current while passing 3A nominal load with minimal voltage drop. Use Value: 20V VRRM exceeds 12V system max (14.4V alternator + transients), and 0.50V drop preserves >95% input voltage under full load. |
| Low-Voltage AC/DC Adapter Output | Industrial SMPS Input Rectification |
Use Scenario: Output rectifier in 5V/3A wall adapter using flyback topology with 60Hz or high-frequency transformer. IC Role / Device Role / Timing Role: Low-loss output rectifier handling continuous 3A DC output; operates at ambient temperatures up to 70°C. Use Value: 3.0A IO rating at 100°C terminal temperature ensures margin for enclosure derating; SMB footprint fits compact adapter PCBs. | Use Scenario: Input-stage rectifier in 24V industrial SMPS with bridge configuration feeding bulk capacitor. IC Role / Device Role / Timing Role: Half-wave rectifier in auxiliary or low-power input stage; handles repetitive 60Hz or 100kHz ripple current. Use Value: Guard ring construction suppresses avalanche-induced failure during line transients; 100A IFSM absorbs 24V line surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB320-E3/52 (Vishay) | Same SMB package, 20V VRRM, 3.0A IO, but VFM = 0.52V @ 3A and RJA = 55°C/W (vs. 50°C/W for B320B-13) | Marginally higher conduction loss and slightly worse ambient thermal performance | Acceptable where 20mV VFM increase and 5°C/W RJA difference are within design margin |
| SS32 (ON Semiconductor) | SMB package, 20V VRRM, 3.0A IO, VFM = 0.55V @ 3A, IRM = 1.0 mA @ 25°C (vs. 0.5 mA for B320B-13) | Higher leakage and forward drop reduce efficiency in thermally constrained designs | Preferred only if SS32's qualified AEC-Q101 status is required for automotive qualification |
Compared with SB320-E3/52 and SS32, B320B-13 offers the lowest VFM (0.50V), tightest IRM (0.5 mA), and best thermal resistance (RJT = 10°C/W), making it optimal for space-constrained, efficiency-critical 3A freewheeling and polarity protection roles.
Availability
B320B-13 is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, 12V automotive polarity protection, and low-voltage AC/DC adapter output requiring stable component supply and RoHS-compliant manufacturing.
Supply support for B320B-13 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 B320/A/B-B360/A/B series targets cost-sensitive, high-volume power conversion applications requiring low-loss, robust Schottky rectification in SMA/SMB/SMC packages for automated SMT assembly.
FAQ
What is the maximum junction temperature for B320B-13?
The absolute maximum junction temperature is +125°C, as specified in the datasheet. Operation beyond this limit risks permanent degradation of the Schottky junction. Derating curves show that average forward current drops to 2.0A at 125°C terminal temperature, confirming thermal design must maintain TJ ≤ 125°C under worst-case ambient and power dissipation.
Is B320B-13 suitable for use in automotive applications?
B320B-13 meets RoHS and JEDEC solderability requirements and operates from –55°C to +125°C, but it is not AEC-Q101 qualified. It may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) where qualification is not mandated, provided system-level testing validates reliability under vibration and thermal cycling.
How does the SMB package of B320B-13 compare thermally to SMC?
The SMB package has RJA = 50°C/W (vs. 40°C/W for SMC), meaning it dissipates heat less efficiently into ambient air. However, its RJT = 10°C/W matches the SMC version, so with adequate PCB copper area (5.0 mm² pad), SMB achieves comparable junction-to-pad thermal performance-making it viable where board space is limited but localized heatsinking is possible.
Can B320B-13 replace a standard PN rectifier like 1N5822?
Yes-B320B-13 is a direct functional replacement for 1N5822 (SMB-packaged 3A/20V Schottky) with identical pinout, package, and electrical ratings. Its 0.50V VFM is 0.05V lower than typical 1N5822, reducing conduction loss by ~150 mW at 3A, which improves efficiency and eases thermal management in dense layouts.
B320B-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 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 @ 20 V
- Capacitance @ Vr, F:
- 200pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
- Operating Temperature - Junction:
- -55°C ~ 150°C
B320B-13 FAQ
1.How can I place an order for B320B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B320B-13 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 B320B-13 reliable?
The price and inventory of B320B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B320B-13 is usually 5 days.
3.What payment methods are accepted for B320B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B320B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B320B-13?
B320B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B320B-13 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 B320B-13?
For technical support, including B320B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B320B-13 requirements.
6.How does Aetrix verify that B320B-13 is sourced from the original manufacturer or authorized distributors?
All B320B-13 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 B320B-13 meets industry standards.
7.What is the process for return or replacement of B320B-13?
All B320B-13 units undergo pre-shipment inspection (PSI). If there is an issue with B320B-13, 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 B320B-13 part is unused and in its original packaging.
Return procedure for B320B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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