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Taiwan Semiconductor Corporation SR309 A0G
- Part No.:
- SR309 A0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR309 A0G.pdf
- Description:
- DIODE SCHOTTKY 90V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,342
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Product details
Overview
SR309 A0G from Taiwan Semiconductor is a 3A, 90V repetitive peak reverse voltage Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.85 V at 3 A, 25°C), high surge current capability (80 A), and 150°C maximum junction temperature. It serves as a primary output rectifier in compact DC-DC converters and offline SMPS where efficiency and thermal robustness are critical.
For engineers reviewing the SR309 A0G datasheet, SR309 A0G pinout, SR309 A0G application, or SR309 A0G equivalent, key selection criteria include its 90 V VRRM, 0.85 V forward drop at rated current, 100 µA reverse leakage at 25°C, DO-201AD mechanical compatibility, and AEC-Q101 qualification availability in H-suffix variants.
Technical Context
This Schottky rectifier uses a single-die construction with guard ring overvoltage protection and pure tin-plated leads compliant with J-STD-002 solderability. Its 15 °C/W junction-to-case thermal resistance enables effective heat transfer to PCB copper pads or heatsinks in high-density power stages.
The device operates across –55°C to +150°C junction temperature range and sustains 10,000 V/µs critical rate of rise of off-state voltage-supporting fast-switching topologies without spurious turn-on. Reverse leakage remains ≤2 mA at 125°C and rated VR, ensuring stable blocking under elevated thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - Maximum repetitive reverse voltage the device blocks reliably in continuous operation |
| IF | 3 A - Average forward current rating at case temperature ≤75°C with adequate PCB copper area |
| VF | 0.85 V @ 3 A, 25°C - Low conduction loss enabling >92% efficiency in 12 V output SMPS |
| IFSM | 80 A - Peak non-repetitive surge current tolerance for line transients or startup inrush |
| TJ max | +150°C - Extended thermal operating limit allowing use in sealed or high-ambient environments |
| RθJC | 15 °C/W - Enables direct thermal path design from die to heatsink or thick copper plane |
| IR | 100 µA @ 90 V, 25°C - Low leakage preserves standby power budget in energy-efficient adapters |
Pinout & Package
DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connected to input/source side of rectification stage; requires low-inductance trace routing |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output/load side; cathode band must align with PCB silkscreen polarity indicator |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Prevents edge breakdown at high dv/dt, enabling reliable operation in flyback and LLC resonant converters |
| RoHS & halogen-free | Complies with IEC 61249-2-21; eliminates brominated flame retardants in molding compound |
| UL 94V-0 molding compound | Self-extinguishing encapsulation suitable for safety-critical power supplies requiring fire resistance |
| High IFSM/IF ratio (26.7×) | Supports transient overload handling without derating in industrial motor drive auxiliary supplies |
Applications
| Server PSU Secondary Rectification | Industrial DC-DC Converter Output Stage |
|---|---|
Use Scenario: 12 V/24 V isolated output rectification in 80 PLUS Titanium server PSUs with <100 mV ripple requirement. IC Role / Device Role / Timing Role: Primary Schottky output rectifier replacing synchronous MOSFETs in cost-sensitive designs. Use Value: 0.85 V VF reduces conduction loss by ~18% vs. comparable 100 V Si diodes, improving full-load efficiency by 0.4–0.6%. | Use Scenario: 5 V/3.3 V regulation in DIN-rail mounted programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Freewheeling and output rectification in dual-active-bridge isolated DC-DC stages. Use Value: 150°C TJ max allows uninterrupted operation at 70°C ambient with 20 K margin, eliminating thermal shutdown events. |
| Automotive Body Control Module Supply | USB-C PD Adapter Secondary Side |
Use Scenario: 5 V auxiliary rail generation from 12 V battery in AEC-Q101-compliant BCMs (H-suffix variant required). IC Role / Device Role / Timing Role: Input rectifier for buck-derived bias supply feeding CAN/LIN transceivers. Use Value: Guard ring and 10,000 V/µs dv/dt rating prevent false triggering during load dump transients per ISO 7637-2. | Use Scenario: Secondary-side rectification in 65 W GaN-based USB-C PD adapters targeting compact form factor. IC Role / Device Role / Timing Role: High-frequency output rectifier synchronized with 100–300 kHz switching frequency. Use Value: 15 °C/W RθJC enables direct mounting to thermal pad on 2-layer PCB, reducing need for internal heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-3EYH09-M3/45 | Same DO-201AD package, 90 V VRRM, but 0.82 V VF @ 3 A and 200 µA IR @ 25°C | Slightly lower forward drop but higher leakage; less suitable for low-standby-power designs | Prefer when minimal conduction loss dominates over leakage-critical standby performance |
| ON Semiconductor SB390-E3/54 | DO-201AD, 90 V VRRM, 0.87 V VF @ 3 A, 500 µA IR @ 25°C, no AEC-Q101 option | Higher leakage and no automotive qualification path; lower thermal robustness (TJ max = 125°C) | Select only for non-automotive, cost-driven consumer adapter applications with relaxed thermal margins |
Compared with VS-3EYH09-M3/45 and SB390-E3/54, SR309 A0G delivers tighter leakage control (100 µA), extended thermal capability (+150°C), and AEC-Q101 qualification pathway-making it optimal for industrial and automotive-adjacent power supplies demanding reliability and low standby loss.
Availability
SR309 A0G is available at Aetrix Electronics and suitable for switching mode power supplies, DC-DC converters, and AC-DC adapters requiring stable component supply, consistent parametric performance, and long-term manufacturability assurance.
Supply support for SR309 A0G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and computing markets.
The SR302–SR320 series was developed to deliver high-efficiency, thermally robust Schottky rectifiers for space-constrained power conversion stages-emphasizing low VF, high IFSM, and extended junction temperature operation.
FAQ
What is the maximum junction temperature rating for SR309 A0G?
The SR309 A0G has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet (Version J2105). This allows operation in high-ambient environments such as enclosed industrial enclosures or automotive under-hood auxiliary supplies when properly heatsinked. The SR309 A0G maintains specified electrical parameters up to this limit.
Does SR309 A0G have AEC-Q101 qualification?
The SR309 A0G part number itself is not AEC-Q101 qualified; qualification applies only to variants marked with the "H" suffix (e.g., SR309H or SR309HA0G). Per Taiwan Semiconductor's ordering information, "H" denotes AEC-Q101 compliance. Engineers requiring automotive-grade reliability must specify the H-suffix version-not SR309 A0G-for qualifying applications.
What is the forward voltage drop of SR309 A0G at 3 A and 125°C?
The SR309 A0G forward voltage (VF) is not specified at 125°C in the published datasheet; only the 25°C value (0.85 V max) is guaranteed. However, typical VF increases ~2 mV/°C, so at 125°C it would be approximately 1.05 V. For design-critical thermal analysis, engineers should refer to Figure 4 (Typical Forward Characteristics) in the SR302–SR320 datasheet (J2105) to extract VF at actual operating temperature and current.
Is SR309 A0G compatible with lead-free reflow soldering processes?
Yes, SR309 A0G features pure tin-plated leads that are fully compatible with lead-free reflow soldering per J-STD-002. Its DO-201AD package withstands peak temperatures up to 260°C for 10 seconds, meeting IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for standard surface-mount assembly. No pre-baking is required for standard MSL handling.
What does the "A0G" suffix indicate in SR309 A0G?
The "A0G" suffix in SR309 A0G specifies packaging: "A0" denotes ammo box packaging, and "G" indicates green (halogen-free) molding compound per IEC 61249-2-21. It does not imply AEC-Q101 qualification (that requires "H") or tape-and-reel format (which uses "SR309" or "SR309H"). SR309 A0G contains 500 units per ammo box and is RoHS compliant.
SR309 A0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 90 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 850 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 90 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -55°C ~ 150°C
SR309 A0G FAQ
1.How can I place an order for SR309 A0G through Aetrix?
Please submit a Request for Quotation (RFQ) for SR309 A0G 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 SR309 A0G reliable?
The price and inventory of SR309 A0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR309 A0G is usually 5 days.
3.What payment methods are accepted for SR309 A0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR309 A0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR309 A0G?
SR309 A0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR309 A0G 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 SR309 A0G?
For technical support, including SR309 A0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR309 A0G requirements.
6.How does Aetrix verify that SR309 A0G is sourced from the original manufacturer or authorized distributors?
All SR309 A0G 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 SR309 A0G meets industry standards.
7.What is the process for return or replacement of SR309 A0G?
All SR309 A0G units undergo pre-shipment inspection (PSI). If there is an issue with SR309 A0G, 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 SR309 A0G part is unused and in its original packaging.
Return procedure for SR309 A0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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