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Diodes Incorporated B345AF-13
- Part No.:
- B345AF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
B345AF-13.pdf
- Description:
- DIODE SCHOTTKY 45V 3A SMAF
- Quantity:
- Payment:
- Shipping:
Inventory:54,480
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Product details
Overview
B345AF-13 from Diodes Incorporated is a 3A, 45V Schottky barrier rectifier in SMAF package, featuring 0.50 V max forward voltage at 3A/25°C, 0.30 mA max reverse leakage at 45V/25°C, and 80A non-repetitive surge rating - deployed as a recirculating diode in DC-DC converter output stages.
For engineers reviewing the B345AF-13 datasheet, B345AF-13 pinout, B345AF-13 application, or B345AF-13 equivalent, key selection criteria include low VF for efficiency-critical 12V–48V industrial power rails, high-temperature IR stability up to +150°C, and RoHS-compliant matte tin terminations on copper leadframe.
Technical Context
This Schottky rectifier uses a planar metal-semiconductor junction optimized for low conduction loss and minimal stored charge, enabling fast switching with negligible reverse recovery time. Its thermal resistance (RθJA = 35°C/W on 2"×2" Al board) supports sustained 3A operation at ambient temperatures up to +90°C without forced cooling.
The device exhibits stable reverse leakage across temperature: 0.30 mA at 45V/25°C rising to 18.0 mA at 45V/125°C - a critical parameter for hold-up and blocking integrity in high-temperature power supplies and automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse voltage before breakdown; defines safe blocking range in 36V nominal systems. |
| IO(AV) | 3 A - Continuous average forward current; supports 36W dissipation at 12V input with typical VF. |
| VF(MAX) | 0.50 V @ 3A, 25°C - Low conduction loss enables >95% efficiency in buck converter freewheel paths. |
| IR(MAX) | 0.30 mA @ 45V, 25°C - Low leakage preserves energy in standby mode and prevents thermal runaway at elevated temperatures. |
| IFSM | 80 A - Withstands single half-sine surge; protects against inrush during hot-plug or load dump events. |
| RθJA | 35 °C/W - Thermal performance on standard 2"×2" aluminum PCB enables passive-cooled 3A operation up to +90°C ambient. |
| Junction Cap. | 120 pF @ 4V, 1MHz - Low capacitance minimizes switching noise and EMI in high-frequency SMPS designs. |
Pinout & Package
Package: SMAF (Surface-Mount Axial Flat), 2-pin molded plastic package with cathode band marking; UL 94V-0 rated, 0.036 g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck converter); accepts 3A continuous forward flow. |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output rail; blocks 45V reverse bias while maintaining <0.30 mA leakage at room temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF design | 0.43 V typ. @ 3A/125°C - reduces conduction loss by ~30% vs. standard silicon rectifiers, lowering thermal stress in compact layouts. |
| High-temp IR stability | 18.0 mA max @ 45V/125°C - maintains blocking integrity in automotive engine-control modules and industrial motor drives. |
| RoHS & Green compliant | Lead-free matte tin over copper; <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets IEC 61249-2-21 and J-STD-609 Class 1 requirements. |
| SMAF mechanical robustness | 0.90–1.10 mm height, 3.95–4.60 mm width - enables high-density placement and automated optical inspection (AOI) compatibility. |
Applications
| DC-DC Converter Freewheel Path | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Used in synchronous buck converter output stage to conduct inductor current during high-side FET off-time. IC Role / Device Role: Freewheeling Schottky rectifier replacing body diode of low-side MOSFET. Use Value: 0.50 V VF limits power loss to ≤1.5 W at 3A, reducing heatsink requirement and improving transient response. | Use Scenario: Blocking diode in 12V battery backup path for microcontroller power domain. IC Role / Device Role: Reverse-polarity and load-dump protection element in ECU power management. Use Value: 45V VRRM withstands ISO 7637-2 pulse 5a (−150V clamp), while 0.30 mA IR ensures <1 µW standby drain. |
| Industrial PLC Power Input Stage | LED Driver Recirculation Loop |
Use Scenario: Boost diode in wide-input (9–36V) isolated flyback front-end supplying 24V control bus. IC Role / Device Role: High-efficiency output rectifier handling 3A peak current at 100 kHz switching. Use Value: 120 pF junction capacitance suppresses ringing and EMI, easing EN 55032 Class B compliance. | Use Scenario: Recirculation path for inductive current decay in constant-current LED driver with PWM dimming. IC Role / Device Role: Fast-decay path enabling <100 ns current turn-off and precise dimming linearity. Use Value: Near-zero reverse recovery eliminates tail current, preventing LED current overshoot and color shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS34H-TP (Micro Commercial) | 40V VRRM, 0.55V VF max @ 3A, 0.5mA IR @ 40V/25°C | Lower voltage rating; higher VF and IR reduce efficiency in 36V systems | Acceptable for cost-sensitive 12V-only applications where 45V margin is not required. |
| SB340-E3/52T (Vishay) | 40V VRRM, 0.55V VF max @ 3A, 0.5mA IR @ 40V/25°C, DO-214AA package | Larger DO-214AA footprint; 50% higher RθJA (~50°C/W) limits power density | Preferred only when legacy DO-214AA layout reuse is mandatory and thermal headroom exists. |
Compared with SS34H-TP and SB340-E3/52T, B345AF-13 delivers superior 45V blocking margin, lower conduction loss, and tighter thermal resistance - making it optimal for space-constrained, high-efficiency 24–48V industrial and automotive power stages.
Availability
B345AF-13 is available at Aetrix Electronics and suitable for DC-DC converter freewheel paths, automotive ECU power domains, and industrial PLC input stages requiring stable component supply and full traceability.
Supply support for B345AF-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, manufacturing, and sales operations across Asia, Europe, and North America.
The B345AF belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for efficiency-critical, thermally demanding power conversion in industrial automation and automotive subsystems.
FAQ
What is the maximum operating temperature for B345AF-13?
The B345AF-13 has an operating junction temperature range of −55°C to +150°C. Its thermal resistance (RθJA = 35°C/W on 2″×2″ Al board) allows continuous 3A operation up to +90°C ambient without derating, provided PCB copper area meets datasheet layout guidelines.
Is B345AF-13 qualified for automotive applications?
B345AF-13 is not AEC-Q101 qualified per its datasheet. While it operates reliably from −55°C to +150°C and meets RoHS/Green standards, automotive use requires explicit AEC-Q101 certification - Diodes offers AEC-Q101 variants (e.g., B345AFQ-13) for such applications.
How does the SMAF package compare to SMA in size and thermal performance?
The SMAF package is 30% lower in height (max 1.10 mm vs. SMA's 2.20 mm) and features a flatter profile for improved board-level reliability. Its RθJA is 35°C/W (on 2″×2″ Al), matching SMA-class thermal performance despite reduced volume, due to optimized leadframe thermal path.
Can B345AF-13 replace B340AF-13 in existing designs?
Yes - B345AF-13 is a direct drop-in replacement for B340AF-13 with identical SMAF package, pinout, and thermal characteristics. The only difference is 45V vs. 40V VRRM, offering increased reverse voltage margin without circuit modification or layout change.
B345AF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 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:
- 300 µA @ 45 V
- Capacitance @ Vr, F:
- 120pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
B345AF-13 FAQ
1.How can I place an order for B345AF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B345AF-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 B345AF-13 reliable?
The price and inventory of B345AF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B345AF-13 is usually 5 days.
3.What payment methods are accepted for B345AF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B345AF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B345AF-13?
B345AF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B345AF-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 B345AF-13?
For technical support, including B345AF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B345AF-13 requirements.
6.How does Aetrix verify that B345AF-13 is sourced from the original manufacturer or authorized distributors?
All B345AF-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 B345AF-13 meets industry standards.
7.What is the process for return or replacement of B345AF-13?
All B345AF-13 units undergo pre-shipment inspection (PSI). If there is an issue with B345AF-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 B345AF-13 part is unused and in its original packaging.
Return procedure for B345AF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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