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Taiwan Semiconductor Corporation SR309 B0G
- Part No.:
- SR309 B0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR309 B0G.pdf
- Description:
- DIODE SCHOTTKY 90V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:8,784
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Product details
Overview
SR309 B0G from Taiwan Semiconductor is a 3A, 90V Schottky barrier rectifier in DO-201AD package, featuring 0.85V forward voltage at 3A/25°C, 80A surge capability, and 125°C maximum junction temperature. It serves as a high-efficiency output rectifier in DC-DC converters and AC-DC adapters.
For engineers reviewing the SR309 B0G datasheet, SR309 B0G pinout, SR309 B0G application, or SR309 B0G equivalent, key selection criteria include its 90V VRRM rating, low VF for thermal efficiency, AEC-Q101 qualification status (not applicable to B0G variant), and DO-201AD mechanical compatibility with standard through-hole layouts.
Technical Context
This single-die Schottky rectifier operates with unidirectional conduction and uses a guard ring structure for overvoltage protection. Its 10,000 V/µs dv/dt rating supports fast-switching topologies, and it maintains stable reverse leakage ≤100 µA at 25°C and ≤2 mA at 125°C.
The device exhibits RθJA = 50°C/W and RθJC = 15°C/W thermal resistance, enabling reliable operation up to 3A average forward current with appropriate PCB copper area. It is not rated for automotive-grade stress screening per AEC-Q101 - that applies only to "H" suffix variants like SR309H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in flyback or buck output stages |
| IF | 3 A - Continuous average forward current; sets minimum heatsinking requirement for sustained load conditions |
| VF @ 3A, 25°C | 0.85 V - Forward voltage drop; directly determines conduction loss (2.55 W at full load) and thermal rise |
| IFSM | 80 A - Non-repetitive surge current capacity; withstands inrush and transient overload without failure |
| TJ max | 125 °C - Maximum junction temperature; limits ambient + power dissipation budget in enclosed designs |
| IR @ 90V, 25°C | ≤100 µA - Reverse leakage current; ensures minimal standby power loss in high-impedance bias networks |
| Package | DO-201AD - Standard axial-leaded outline with 1.10 g mass; compatible with wave soldering and manual assembly |
Pinout & Package
DO-201AD package: axial-leaded, molded epoxy case with cathode band marking; leads are pure tin plated, J-STD-002 solderable, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node return) |
| Cathode | Forward current exit point | Connected to output filter capacitor positive rail; marked by visible band on body |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.85 V at 3A/25°C - reduces conduction loss by ~15% vs. comparable 100V Si diodes, improving system efficiency |
| Guard ring structure | Enhances edge termination robustness - increases margin against localized avalanche during voltage transients |
| High surge current capability | 80A IFSM (8.3ms half-sine) - sustains repeated cold-start surges in offline SMPS without degradation |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 - enables use in consumer and industrial products requiring green material declarations |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Secondary-side rectification in 30–60W offline flyback converters powering IoT gateways. IC Role / Device Role / Timing Role: Unidirectional power conversion element; replaces slower PN diodes to minimize switching losses. Use Value: 0.85V VF reduces conduction loss by 1.2W vs. 1.1V alternative, lowering heatsink requirements and improving no-load efficiency. | Use Scenario: Output rectification in universal-input 12V/2.5A wall adapters for networking equipment. IC Role / Device Role / Timing Role: High-current freewheeling path during MOSFET off-time; handles continuous 3A DC output. Use Value: 80A IFSM accommodates 3× rated current surges during plug-in events, eliminating need for derating. |
| DC-DC Converters | Industrial Control Power Rails |
Use Scenario: Synchronous rectifier replacement in isolated 48V-to-12V buck-derived converters for PLC I/O modules. IC Role / Device Role / Timing Role: Low-loss freewheeling diode in non-synchronous topology where gate drive complexity must be minimized. Use Value: 50°C/W RθJA allows direct mounting on 1 oz. copper with <15°C rise at full load, simplifying thermal design. | Use Scenario: Input protection and hold-up rectification in 24V DC-powered HMI panels with battery backup. IC Role / Device Role / Timing Role: Reverse polarity and surge protection element; blocks backfeed while conducting during normal operation. Use Value: Guard ring design prevents premature breakdown under 100V line transients common in factory floor environments. |
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, 90V VRRM, but VF = 0.82V @ 3A; slightly lower leakage (50 µA @ 90V/25°C) | Identical SMPS/adapter use cases; tighter VF tolerance may improve light-load regulation | Select when <0.03V VF reduction justifies dual-source qualification |
| ON Semiconductor SB390-E3/54 | 90V VRRM, 3A IF, VF = 0.87V @ 3A; higher IR (200 µA @ 90V/25°C); RoHS-compliant but not halogen-free | Suitable for cost-sensitive industrial supplies where halogen-free is not mandated | Choose for legacy BOM continuity where SB390 has prior qualification history |
Compared with SR309 B0G, VS-3EYH09-M3/45 offers marginally better conduction efficiency and lower leakage, while SB390-E3/54 trades VF and environmental compliance for broader supply chain availability - all three share DO-201AD footprint and 3A/90V functional alignment.
Availability
SR309 B0G is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and DC-DC converters requiring stable component supply across industrial and commercial production cycles.
Supply support for SR309 B0G 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 power and protection markets since 1979.
The SR302–SR320 series was designed specifically for high-efficiency, medium-current rectification in cost-sensitive power conversion systems where thermal performance and reliability outweigh ultra-low VF optimization.
FAQ
What is the maximum junction temperature rating for SR309 B0G?
The SR309 B0G has a maximum junction temperature (TJ) of 125°C. This rating applies under continuous DC forward current conditions and defines the upper thermal limit for reliable long-term operation. Exceeding this temperature risks accelerated parametric drift and reduced lifetime. Derating curves in the official TSC datasheet show allowable current reduction above 25°C ambient.
Is SR309 B0G AEC-Q101 qualified?
No, SR309 B0G is not AEC-Q101 qualified. Only variants with the "H" suffix (e.g., SR309H) undergo AEC-Q101 stress testing. The "B0G" suffix indicates green-compliant packaging and tape-and-reel delivery (500 units per ammo box), but does not imply automotive qualification. For automotive applications, SR309H must be specified.
What is the forward voltage of SR309 B0G at 3A and 100°C junction temperature?
The SR309 B0G forward voltage is not specified at 100°C in the official TSC datasheet. VF is characterized at 25°C (0.85V max) and 125°C (0.72V typ). At 100°C, interpolation suggests ~0.75–0.78V, but design margins should rely only on published 25°C and 125°C data points. Thermal modeling must use the 125°C VF value for worst-case loss calculation.
Does SR309 B0G have a guard ring structure?
Yes, SR309 B0G incorporates a guard ring structure as stated in the TSC datasheet features list. This design enhances voltage standoff capability at the die edge, improving robustness against localized avalanche during fast-rising transients and reducing sensitivity to surface contamination or mechanical stress near the junction perimeter.
What packaging format does SR309 B0G ship in?
SR309 B0G ships in 500-unit ammo boxes (ordering code suffix "B0G"). It uses the DO-201AD package with pure tin-plated leads compliant with J-STD-002 solderability standards. The "B" denotes green compound (halogen-free), "0" is internal revision, and "G" indicates ammo box packing - distinct from tape-and-reel ("SR309" or "SR309H" variants).
SR309 B0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Bulk
- 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 B0G FAQ
1.How can I place an order for SR309 B0G through Aetrix?
Please submit a Request for Quotation (RFQ) for SR309 B0G 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 B0G reliable?
The price and inventory of SR309 B0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR309 B0G is usually 5 days.
3.What payment methods are accepted for SR309 B0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR309 B0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR309 B0G?
SR309 B0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR309 B0G 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 B0G?
For technical support, including SR309 B0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR309 B0G requirements.
6.How does Aetrix verify that SR309 B0G is sourced from the original manufacturer or authorized distributors?
All SR309 B0G 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 B0G meets industry standards.
7.What is the process for return or replacement of SR309 B0G?
All SR309 B0G units undergo pre-shipment inspection (PSI). If there is an issue with SR309 B0G, 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 B0G part is unused and in its original packaging.
Return procedure for SR309 B0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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