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Taiwan Semiconductor Corporation SR309 R0G
- Part No.:
- SR309 R0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR309 R0G.pdf
- Description:
- DIODE SCHOTTKY 90V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,915
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Product details
Overview
SR309 R0G from Taiwan Semiconductor is a 3A, 90V repetitive peak reverse voltage Schottky barrier rectifier in DO-201AD package, featuring 0.85V max forward voltage at 3A and 100µA max reverse current at 25°C, used in high-efficiency DC-DC converters and industrial power adapters.
For engineers reviewing the SR309 R0G datasheet, SR309 R0G pinout, SR309 R0G application, or SR309 R0G equivalent, key selection criteria include its AEC-Q101-qualified variant availability (SR309H), thermal resistance (RθJA = 50°C/W), surge rating (80A IFSM), and low VF trade-off versus higher-voltage SR310/SR315 variants.
Technical Context
This single-die Schottky rectifier operates with junction temperature range of –55°C to +125°C (standard) or up to +150°C for select variants, and delivers high surge capability (80A, 8.3ms half-sine) while maintaining low conduction loss via guard-ring-protected structure.
Its DO-201AD package supports pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance, with polarity indicated by cathode band and UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - Maximum non-repetitive reverse blocking voltage; defines safe operating limit in flyback or boost topologies |
| IF | 3 A - Continuous average forward current; sets thermal design baseline for heatsinking and PCB copper area |
| VF (max) | 0.85 V @ 3A, 25°C - Directly determines conduction loss (2.55W at full load), critical for efficiency optimization |
| IR (max) | 100 µA @ 90V, 25°C - Low leakage enables stable operation in high-impedance bias networks and standby circuits |
| IFSM | 80 A - Withstands inrush and transient overloads without failure; supports robust input-stage protection |
| RθJA | 50 °C/W - Enables thermal estimation on standard FR-4 PCBs without forced air; limits junction rise to 150°C at 3A |
| TJ max | 125 °C - Standard maximum junction temperature; derating required above ambient >75°C per Fig.1 curve |
Pinout & Package
DO-201AD axial-leaded package with cathode-indicating band; two-terminal device: Anode (lead without band) and Cathode (lead with band). Mounting requires axial through-hole placement and lead forming per JEDEC TO-204AA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit / reverse-blocking terminal | Connected to output rail; polarity band must align with PCB silkscreen cathode mark |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Prevents edge breakdown under transient overvoltage, improving reliability in unregulated input stages |
| Low VF (0.85V) | Reduces power dissipation by ~30% vs. comparable 100V Si diodes, enabling smaller thermal solutions |
| AEC-Q101 qualification option | SR309H variant available for automotive power modules requiring stress-tested component validation |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
| J-STD-002 solderable leads | Ensures consistent wetting and joint integrity during wave or selective solder reflow processes |
Applications
| Server Power Supply | Industrial DC-DC Converter |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 48V-to-12V isolated buck-derived converters. IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during low-side MOSFET off-time; handles continuous 3A output current. Use Value: 0.85V VF minimizes conduction loss, improving system efficiency by ≥1.2% versus 1N5822 at 3A load. | Use Scenario: Output rectification in 24V-input, 5V/3A regulated industrial SMPS. IC Role / Device Role / Timing Role: Uncontrolled rectifier in bridge or center-tapped configuration; operates at 100kHz switching frequency. Use Value: 80A IFSM withstands cold-start surges; 50°C/W RθJA allows operation at 70°C ambient without heatsink. |
| USB-C PD Adapter | Automotive Body Control Module |
Use Scenario: Secondary-side rectification in compact 65W GaN-based USB-C PD adapter. IC Role / Device Role / Timing Role: High-frequency rectifier in quasi-resonant flyback; conducts 3A average with 100kHz+ ripple. Use Value: Low 100µA IR at 25°C prevents standby power drift; DO-201AD fits constrained board height. | Use Scenario: Reverse-polarity protection and load dump clamping in 12V BCM power rail. IC Role / Device Role / Timing Role: Clamp diode across relay coil or motor driver H-bridge; absorbs inductive kickback. Use Value: Guard ring enables reliable 10,000 V/µs dv/dt handling during load dump transients per ISO 7637-2. |
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-3EJH09-M3/45 | Same DO-201AD package, 3A/90V, VF = 0.82V typ, IR = 100µA max - slightly lower VF but no AEC-Q101 option | Identical use in SMPS secondary; lacks automotive-qualified variant for harsh-environment deployment | Select when lowest possible conduction loss is prioritized and automotive qualification is not required |
| ON Semiconductor SB390-E3/54 | DO-201AD, 3A/90V, VF = 0.87V max, IR = 200µA max - higher leakage, no guard ring, TJ max = 125°C only | Suitable for cost-sensitive consumer adapters; not recommended for high-reliability or high-temp industrial use | Choose for budget-constrained designs where 2× leakage and absence of guard ring are acceptable |
Compared with VS-3EJH09-M3/45 and SB390-E3/54, SR309 R0G offers balanced VF/IR performance, built-in guard ring for transient robustness, and optional AEC-Q101 qualification-making it optimal for industrial and automotive-adjacent power conversion where reliability and thermal margin are critical.
Availability
SR309 R0G is available at Aetrix Electronics and suitable for switching mode power supplies, DC-DC converters, and industrial adapters requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SR309 R0G 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, serving global industrial, computing, and automotive markets since 1979.
The SR302–SR320 series was designed specifically for high-efficiency, medium-current power conversion in space-constrained applications-emphasizing low VF, robust surge capability, and extended temperature operation in DO-201AD packaging.
FAQ
What is the maximum junction temperature rating for SR309 R0G?
The SR309 R0G has a maximum junction temperature (TJ) of +125°C under standard conditions. This rating applies to the base SR309 R0G variant; the AEC-Q101-qualified SR309H version supports up to +150°C. Thermal design must account for RθJA = 50°C/W and ambient conditions to ensure TJ remains within limit during continuous 3A operation.
Is SR309 R0G pin-compatible with other devices in the SR302–SR320 family?
Yes, all SR302–SR320 devices-including SR309 R0G-share identical DO-201AD package dimensions, lead spacing, and axial pinout (anode/cathode). They are mechanically interchangeable; however, electrical parameters (VRRM, VF, IR) differ by voltage grade, so substitution requires verification against circuit voltage and loss requirements.
Does SR309 R0G meet automotive qualification standards?
The base SR309 R0G is not AEC-Q101 qualified; however, the SR309H variant (ordering code SR309H or SR309HA0G) is fully AEC-Q101 certified. Engineers requiring automotive-grade reliability must specify the "H" suffix-SR309 R0G itself is intended for industrial and commercial power applications.
What is the reverse leakage current specification for SR309 R0G at elevated temperature?
At TJ = 125°C and rated VR = 90V, SR309 R0G exhibits ≤2 mA reverse current (IR). This value is confirmed in the Electrical Specifications table on page 3 of the J2105 datasheet and reflects worst-case leakage under high-temperature stress, critical for standby power budgeting in thermally demanding environments.
How does the guard ring feature in SR309 R0G improve system reliability?
The guard ring in SR309 R0G mitigates edge breakdown during voltage transients, enabling reliable operation at dv/dt rates up to 10,000 V/µs. This structural enhancement prevents premature avalanche failure in flyback snubbers or inductive load switching-directly extending service life in industrial motor drives and automotive body control modules where fast-rising transients occur.
SR309 R0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 R0G FAQ
1.How can I place an order for SR309 R0G through Aetrix?
Please submit a Request for Quotation (RFQ) for SR309 R0G 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 R0G reliable?
The price and inventory of SR309 R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR309 R0G is usually 5 days.
3.What payment methods are accepted for SR309 R0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR309 R0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR309 R0G?
SR309 R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR309 R0G 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 R0G?
For technical support, including SR309 R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR309 R0G requirements.
6.How does Aetrix verify that SR309 R0G is sourced from the original manufacturer or authorized distributors?
All SR309 R0G 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 R0G meets industry standards.
7.What is the process for return or replacement of SR309 R0G?
All SR309 R0G units undergo pre-shipment inspection (PSI). If there is an issue with SR309 R0G, 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 R0G part is unused and in its original packaging.
Return procedure for SR309 R0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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