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Vishay General Semiconductor - Diodes Division VSSAF5L45-M3/6A
- Part No.:
- VSSAF5L45-M3/6A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
VSSAF5L45-M3/6A.pdf
- Description:
- DIODE SCHOTTKY 45V 3A DO221AC
- Quantity:
- Payment:
- Shipping:
Inventory:12,033
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Product details
Overview
VSSAF5L45-M3/6A from Vishay General Semiconductor is a surface-mount Trench MOS Barrier Schottky (TMBS®) rectifier in SlimSMA (DO-221AC) package, rated for 45 V repetitive peak reverse voltage, 5.0 A average forward current, and 0.39 V forward voltage at 5.0 A. It delivers low power loss in DC/DC converters and polarity protection circuits with 150 °C max junction temperature and MSL Level 1 moisture sensitivity.
For engineers reviewing the VSSAF5L45-M3/6A datasheet, VSSAF5L45-M3/6A pinout, VSSAF5L45-M3/6A application, or VSSAF5L45-M3/6A equivalent, key selection criteria include its 0.39 V VF at 5 A, 100 A IFSM surge rating, SlimSMA footprint compatibility, AEC-Q101-qualified variants (HM3), and thermal resistance of 12 °C/W junction-to-mount on 10 mm × 10 mm copper pads.
Technical Context
This device employs trench MOS Schottky technology to achieve lower forward voltage and higher efficiency than planar Schottky or standard PN rectifiers. Its single-diode configuration supports unidirectional current flow with cathode band polarity marking and operates across -40 °C to +150 °C junction temperature range.
The SlimSMA (DO-221AC) package enables ultra-low profile mounting (0.95 mm typical height) and automated placement, while meeting UL 94 V-0 flammability and JESD201 Class 1A whisker testing requirements for commercial-grade M3 suffix variants like VSSAF5L45-M3/6A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - maximum reverse blocking capability without breakdown in freewheeling or polarity protection roles |
| IF(AV) | 5.0 A - continuous DC forward current handling on 10 mm × 10 mm 2 oz. FR4 pad |
| VF @ 5.0 A | 0.39 V - low conduction loss enabling high-efficiency 12 V/5 V DC/DC stages |
| IFSM | 100 A - short-duration surge tolerance during load dump or startup transients |
| TJ max | 150 °C - extended thermal operating margin for under-hood or enclosed industrial environments |
| RθJM | 12 °C/W - low junction-to-mount thermal resistance critical for thermal management on PCB copper pads |
| CJ @ 4 V | 740 pF - low junction capacitance supporting high-frequency switching up to ~1 MHz |
Pinout & Package
Package: SlimSMA (DO-221AC), surface-mount, 2-terminal, ultra-low-profile (0.95 mm typical height), matte tin-plated leads, cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal | Connected to input/source side in forward-biased operation; requires low-impedance trace routing for high-current paths |
| Cathode | Current exit terminal | Marked with color band; ties to output/load or ground return path; primary thermal interface to PCB copper pad |
Key Features
| Feature | Design Value |
|---|---|
| Trench MOS Schottky technology | Enables 0.39 V VF at 5 A - reduces conduction loss by ≥15 % vs. comparable planar Schottky diodes |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak - eliminates baking requirements before SMT assembly |
| UL 94 V-0 molding compound | Ensures flame-retardant behavior in safety-critical power supplies and automotive ECUs |
| JESD201 Class 1A whisker test compliance | Guarantees long-term solder joint reliability in commercial-grade applications with thermal cycling |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global electronics manufacturing and end-of-life recycling |
Applications
| DC/DC Converters | Polarity Protection |
|---|---|
Use Scenario: Output rectification in synchronous or non-synchronous buck converters delivering 3.3 V–12 V at up to 5 A. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during high-side switch off-time. Use Value: 0.39 V VF minimizes conduction loss and improves system efficiency by >2 % at full load versus 0.55 V alternatives. | Use Scenario: Reverse-voltage protection at power input of industrial controllers or USB-C PD accessories. IC Role / Device Role / Timing Role: Series-blocking diode preventing damage from misconnected power sources. Use Value: 45 V VRRM and 100 A IFSM withstand accidental 24 V reverse connection and transient surges without failure. |
| Low-Voltage Inverters | Freewheeling Circuits |
Use Scenario: Output stage clamping in 24 V battery-powered motor inverters for small appliances or power tools. IC Role / Device Role / Timing Role: Clamp diode absorbing inductive kickback during PWM switching transitions. Use Value: 150 °C TJ max and 12 °C/W RθJM allow sustained operation at 85 °C ambient without derating in compact enclosures. | Use Scenario: Inductive load suppression in solenoid drivers or relay control modules. IC Role / Device Role / Timing Role: Freewheeling path for stored energy in coil windings during turn-off. Use Value: 740 pF CJ and fast recovery enable clean voltage clamping with minimal ringing in 20–100 kHz switching applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VSSAF510-M3/6A | Same SlimSMA package, 100 V VRRM, 0.52 V VF @ 5 A | Higher reverse voltage but higher conduction loss - suitable where 45 V margin is insufficient | Select when system input may exceed 45 V or transient spikes require extra blocking headroom |
| SS5P4-M3/6A | Same 45 V VRRM, 5 A rating, but SMA package (DO-214AC), 0.55 V VF @ 5 A, 1.5 mm height | Larger footprint and higher VF - less efficient and less space-constrained than SlimSMA | Choose only if legacy SMA layout exists and board rework is prohibitive |
Compared with VSSAF5L45-M3/6A, VSSAF510-M3/6A trades lower VF for higher VRRM, while SS5P4-M3/6A offers mechanical compatibility over electrical optimization - making VSSAF5L45-M3/6A the preferred choice for space- and efficiency-critical 45 V systems.
Availability
VSSAF5L45-M3/6A is available at Aetrix Electronics and suitable for DC/DC converters, polarity protection circuits, and low-voltage inverter designs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for VSSAF5L45-M3/6A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on high-reliability, high-efficiency power solutions.
The TMBS® (Trench MOS Barrier Schottky) product line was developed to deliver superior forward voltage and thermal performance in ultra-compact surface-mount packages for next-generation power conversion and protection circuits.
FAQ
What is the maximum junction temperature rating for VSSAF5L45-M3/6A?
The VSSAF5L45-M3/6A has a maximum junction temperature (TJ max) of +150 °C, verified per datasheet revision 08-Jun-2020. This rating allows reliable operation in thermally demanding environments such as enclosed power supplies or automotive under-hood applications. Derating curves in Figure 1 confirm usable current down to 125 °C mount temperature. The VSSAF5L45-M3/6A must be mounted on recommended 10 mm × 10 mm copper pads to maintain thermal integrity at this limit.
Is VSSAF5L45-M3/6A suitable for automotive applications?
VSSAF5L45-M3/6A is the commercial-grade variant and is not AEC-Q101 qualified. For automotive use, specify the HM3 suffix version (e.g., VSSAF5L45HM3_A/H), which carries AEC-Q101 qualification and meets JESD201 Class 2 whisker testing. The VSSAF5L45-M3/6A remains appropriate for industrial, computing, and consumer power systems where AEC-Q101 is not mandated.
What does the "6A" in VSSAF5L45-M3/6A indicate?
The "6A" in VSSAF5L45-M3/6A is the preferred package code denoting 7-inch diameter plastic tape-and-reel packaging containing 3500 units. It is distinct from "6B", which indicates 13-inch reels with 14,000 units. This code appears in ordering information and affects logistics and SMT feeder setup but does not alter electrical or thermal specifications of the VSSAF5L45-M3/6A device itself.
How does the SlimSMA package of VSSAF5L45-M3/6A compare to standard SMA?
The SlimSMA (DO-221AC) package of VSSAF5L45-M3/6A measures just 0.95 mm in height - significantly lower than standard SMA (DO-214AC) at ~1.5 mm - enabling thinner end products and improved airflow. Its optimized thermal pad design yields RθJM = 12 °C/W, outperforming SMA's typical 25–30 °C/W. The VSSAF5L45-M3/6A also features tighter dimensional tolerances and enhanced solderability per J-STD-002.
What is the forward voltage of VSSAF5L45-M3/6A at 2.5 A and 125 °C?
Per the Electrical Characteristics table, the VSSAF5L45-M3/6A exhibits a typical forward voltage (VF) of 0.31 V at IF = 2.5 A and TA = 125 °C. This value reflects reduced VF at elevated temperature due to Schottky barrier physics and confirms stable performance across automotive or industrial operating ranges. The VSSAF5L45-M3/6A maintains sub-0.4 V conduction even at high junction temperatures, supporting high-efficiency thermal design.
VSSAF5L45-M3/6A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- TMBS®
- 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:
- 560 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 650 µA @ 45 V
- Capacitance @ Vr, F:
- 740pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-221AC (SlimSMA)
- Operating Temperature - Junction:
- -40°C ~ 150°C
VSSAF5L45-M3/6A FAQ
1.How can I place an order for VSSAF5L45-M3/6A through Aetrix?
Please submit a Request for Quotation (RFQ) for VSSAF5L45-M3/6A 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 VSSAF5L45-M3/6A reliable?
The price and inventory of VSSAF5L45-M3/6A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VSSAF5L45-M3/6A is usually 5 days.
3.What payment methods are accepted for VSSAF5L45-M3/6A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VSSAF5L45-M3/6A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VSSAF5L45-M3/6A?
VSSAF5L45-M3/6A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VSSAF5L45-M3/6A 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 VSSAF5L45-M3/6A?
For technical support, including VSSAF5L45-M3/6A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VSSAF5L45-M3/6A requirements.
6.How does Aetrix verify that VSSAF5L45-M3/6A is sourced from the original manufacturer or authorized distributors?
All VSSAF5L45-M3/6A 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 VSSAF5L45-M3/6A meets industry standards.
7.What is the process for return or replacement of VSSAF5L45-M3/6A?
All VSSAF5L45-M3/6A units undergo pre-shipment inspection (PSI). If there is an issue with VSSAF5L45-M3/6A, 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 VSSAF5L45-M3/6A part is unused and in its original packaging.
Return procedure for VSSAF5L45-M3/6A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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