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Diodes Incorporated B350B-13
- Part No.:
- B350B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
B350B-13.pdf
- Description:
- DIODE SCHOTTKY 50V 3A SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,721
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Product details
Overview
B350B-13 from Diodes Incorporated is a 50 V, 3.0 A surface-mount Schottky barrier rectifier in SMB package, featuring 0.70 V forward voltage at 3.0 A, 100 A non-repetitive surge rating, and 20 mA peak reverse current at 100°C - used for polarity protection and freewheeling in DC-DC converters and low-voltage power supplies.
For engineers reviewing the B350B-13 datasheet, B350B-13 pinout, B350B-13 application, or B350B-13 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (RJT = 10 °C/W), surge capability (100 A, 8.3 ms), and RoHS-compliant matte tin plating for lead-free assembly.
Technical Context
This Schottky rectifier employs guard ring die construction to enhance transient immunity and reduce leakage under high-temperature operation. Its low VF enables high-efficiency operation in 5–12 V output stages where conduction loss dominates thermal design.
The device is optimized for high-frequency switching applications up to several hundred kHz, with 250 pF junction capacitance and fast recovery characteristics inherent to Schottky architecture - no minority-carrier storage delay or reverse recovery charge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse voltage; sets safe operating limit for DC blocking in 36 V nominal systems. |
| IO | 3.0 A @ TT = 100°C - continuous forward current rating with thermal derating above 100°C terminal temperature. |
| VFM | 0.70 V @ IF = 3.0 A - low conduction loss enabling >92% efficiency in 5 V/3 A buck converter output stage. |
| IFSM | 100 A, 8.3 ms half-sine - withstands inrush and short-circuit surge without bond-wire fusing. |
| RJT | 10 °C/W - junction-to-terminal thermal resistance with 5 mm² copper pad; enables direct PCB heat sinking without external heatsink. |
| CT | 250 pF @ 1 MHz, 4 V reverse - limits high-frequency displacement current in snubberless flyback designs. |
| Tj Range | −55 to +125°C - supports automotive under-hood and industrial control environments without derating. |
Pinout & Package
SMB package: molded plastic case (UL 94V-0), cathode band marking, matte tin-plated terminals, moisture sensitivity level 1. Dimensions: 3.30–3.94 mm (L) × 4.06–4.57 mm (W) × 1.96–2.21 mm (H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side; must handle full load current and surge without voltage overshoot. |
| Cathode | Forward current exit / reverse blocking node | Marked by band; ties to output/load ground or return path; reverse leakage flows here under bias. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves ESD and transient robustness without increasing VF or leakage - critical for unregulated input rails. |
| Low VF at high current | 0.70 V @ 3.0 A reduces power dissipation to 2.1 W versus 3.6 W for 1.2 V Si diode - lowers board temperature rise by ~15°C. |
| 100 A surge rating | Supports hot-plug and capacitive inrush events in PoE-powered devices and battery backup circuits. |
| RoHS-compliant matte tin finish | Ensures reliable solderability per MIL-STD-202 Method 208 and eliminates lead-based reflow concerns. |
Applications
| DC-DC Converter Output Rectification | Automotive Body Control Module Power Input |
|---|---|
Use Scenario: 12 V input to 5 V/3 A buck converter in infotainment head unit. IC Role / Device Role / Timing Role: Freewheeling diode during low-side switch off-time; conducts inductor current continuously. Use Value: 0.70 V VF minimizes conduction loss and thermal stress on PCB copper, avoiding localized hot spots near processor SoC. | Use Scenario: Reverse polarity protection at 12 V battery input of BCM ECU. IC Role / Device Role / Timing Role: Series anode-cathode blocking element; conducts only during correct polarity connection. Use Value: 50 V VRRM provides 4× margin over 12 V nominal, accommodating load dump transients up to 35 V per ISO 7637-2. |
| Industrial PLC Digital I/O Protection | USB-C Power Delivery Sink Protection |
Use Scenario: Polarity guard on 24 V DC field wiring terminals of modular I/O card. IC Role / Device Role / Timing Role: Input-side series rectifier preventing damage from miswired field cables. Use Value: 100 A IFSM withstands accidental 24 V short-to-ground events without failure, ensuring system uptime. | Use Scenario: Reverse-current blocking between USB-C PD sink port and internal 5–20 V rail. IC Role / Device Role / Timing Role: Cathode-connected to PD controller VBUS line; blocks backfeed during dead-battery conditions. Use Value: 20 mA IR at 100°C ensures minimal standby leakage (<100 µW) across 20 V rail, preserving battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS35-E3/57T (Vishay) | Same SMB package, 50 V VRRM, but VF = 0.75 V @ 3 A and RJT = 12 °C/W. | Higher conduction loss and thermal resistance reduce efficiency in thermally constrained layouts. | Prefer B350B-13 where board space limits copper area or ambient exceeds 70°C. |
| SB350 (ON Semiconductor) | SMC package (larger footprint), identical VRRM/IO, but VF = 0.72 V @ 3 A and RJT = 8.5 °C/W. | Requires more PCB area but offers better thermal performance in high-power-density designs. | Choose SB350 only if SMC mounting is already standardized and thermal margin is critical. |
Compared with SS35-E3/57T and SB350, B350B-13 delivers optimal balance of low VF, compact SMB footprint, and proven transient robustness - making it preferred for space-constrained 12–24 V industrial and automotive power interfaces where thermal management relies on minimal copper.
Availability
B350B-13 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive body control module power input, and industrial PLC digital I/O protection requiring stable component supply across extended temperature and surge conditions.
Supply support for B350B-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, specializing in high-reliability power management and signal integrity solutions for industrial, automotive, and computing markets.
The B3xx series targets cost-sensitive, high-volume power conversion applications where low forward voltage, surge resilience, and RoHS compliance are mandatory - designed specifically for automated SMT assembly in consumer and industrial power supplies.
FAQ
What is the cathode marking method for B350B-13?
The cathode is marked by a distinct band printed on the device body, aligned with the cathode terminal. Some production lots may also feature a semicircular notch on one side of the SMB package - both markings indicate the same cathode polarity and must be verified before placement.
Can B350B-13 replace a standard silicon rectifier in a 12 V power supply?
Yes, provided the original silicon part's VRRM ≥ 50 V and IO ≤ 3.0 A. B350B-13 reduces conduction loss by ~40% versus a 1N5822 (VF ≈ 0.9 V), improving efficiency and lowering thermal stress - but requires verifying layout clearance for its lower reverse leakage.
Is B350B-13 suitable for use in a 400 kHz switching converter?
Yes. With no reverse recovery charge and only 250 pF junction capacitance, B350B-13 operates efficiently at 400 kHz without significant switching loss or ringing - confirmed by typical forward/reverse characteristic curves in DS13005 Rev. 12-2.
What is the maximum PCB copper pad area recommended for thermal performance?
Diodes Incorporated specifies a 5.0 mm² copper pad (0.013 mm thick) for the RJT = 10 °C/W rating. Increasing pad area beyond 5 mm² yields diminishing returns; adding thermal vias to inner layers improves RJA more effectively than oversized surface pads alone.
B350B-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):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 700 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 50 V
- Capacitance @ Vr, F:
- 200pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
- Operating Temperature - Junction:
- -55°C ~ 150°C
B350B-13 FAQ
1.How can I place an order for B350B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B350B-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 B350B-13 reliable?
The price and inventory of B350B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B350B-13 is usually 5 days.
3.What payment methods are accepted for B350B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B350B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B350B-13?
B350B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B350B-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 B350B-13?
For technical support, including B350B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B350B-13 requirements.
6.How does Aetrix verify that B350B-13 is sourced from the original manufacturer or authorized distributors?
All B350B-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 B350B-13 meets industry standards.
7.What is the process for return or replacement of B350B-13?
All B350B-13 units undergo pre-shipment inspection (PSI). If there is an issue with B350B-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 B350B-13 part is unused and in its original packaging.
Return procedure for B350B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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