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Diodes Incorporated SD103C-T
- Part No.:
- SD103C-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
SD103C-T.pdf
- Description:
- DIODE SCHOTTKY 20V 350MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,695
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Product details
Overview
SD103C-T from Diodes Incorporated is a 20 V, 350 mA surface-mount Schottky barrier diode in DO-35 glass package, featuring 0.60 V max forward voltage at 200 mA, 10 ns reverse recovery time, and 50 pF junction capacitance - used for low-loss DC power rectification and high-frequency clamping in compact consumer power supplies.
For engineers reviewing the SD103C-T datasheet, SD103C-T pinout, SD103C-T application, or SD103C-T equivalent, key selection criteria include its 20 V VRRM rating, low VF at high IF, guard ring construction for transient robustness, and tape-and-reel packaging for automated assembly.
Technical Context
This Schottky diode employs platinum-silicide or similar low-barrier metal–semiconductor junction technology to achieve fast switching (trr ≤ 10 ns) and minimal conduction loss. Its guard ring structure isolates the active junction from surface contamination and edge breakdown, enhancing reliability under repetitive surge conditions.
Designed for operation up to 125°C junction temperature, it maintains stable reverse leakage (<5.0 µA at VR = 10 V) and low thermal resistance (RθJA = 300°C/W), enabling use in thermally constrained PCB layouts without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage before avalanche; sets upper limit for blocking capability in 12 V rail clamping. |
| IF(AV) | 350 mA - Average forward current handling; supports continuous operation in low-power adapter secondary-side rectification. |
| VF @ 200 mA | 0.60 V max - Low conduction loss reduces heat generation and improves efficiency in battery-powered devices. |
| trr | 10 ns - Fast recovery enables use in >1 MHz switching topologies without significant commutation loss. |
| CT @ 0 V | 50 pF - Low junction capacitance minimizes RF noise coupling and preserves signal integrity in EMI-sensitive circuits. |
| IRM @ 10 V | 5.0 µA max - Tight leakage spec ensures stable biasing in high-impedance sensing paths and low-quiescent circuits. |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are Sn96.5Ag3.5 solderable per MIL-STD-202 Method 208; polarity identified by single black band at cathode end.
| 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); must withstand IFSM = 15 A surge. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with black band; ties to output rail or ground return; handles full VRRM during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Prevents edge-induced avalanche and improves ESD/EMI transient immunity without external protection components. |
| Low VF at high IF | 0.60 V max at 200 mA enables >90% efficiency in 3.3 V–5 V buck converter synchronous rectifier replacement. |
| RoHS-compliant finish | Sn96.5Ag3.5 lead termination meets JEDEC J-STD-020C Level 1 moisture sensitivity for reflow compatibility. |
| Fast trr | 10 ns recovery time allows clean zero-voltage switching in flyback snubber networks and high-frequency clamp circuits. |
Applications
| USB Power Delivery Interface | Wireless Charging Receiver |
|---|---|
Use Scenario: Reverse polarity protection and input rail clamping in 5 V–20 V USB PD sink circuitry. IC Role / Device Role / Timing Role: Unidirectional current steering diode preventing backfeed into source while clamping transients from hot-plug events. Use Value: 0.60 V VF minimizes voltage drop across protection path, preserving regulated bus margin for downstream PMICs. | Use Scenario: Synchronous rectification in resonant wireless charging receiver coils operating at 100–200 kHz. IC Role / Device Role / Timing Role: High-speed freewheeling diode replacing MOSFET body diode to reduce conduction loss and improve thermal performance. Use Value: 10 ns trr prevents tail current overlap during switching transitions, reducing RMS current stress on coil and capacitor. |
| IoT Sensor Node Power | LED Driver Bias Circuit |
Use Scenario: Battery backup path management in coin-cell–powered environmental sensors with dual supply inputs. IC Role / Device Role / Timing Role: OR-ing diode isolating primary and backup rails while minimizing dropout in ultra-low-IQ design. Use Value: 5.0 µA IR at 10 V ensures <10 nW standby leakage, extending shelf life of sealed sensor units. | Use Scenario: Constant-current bias feed for white LED strings in automotive interior lighting modules. IC Role / Device Role / Timing Role: Low-VF series pass element in linear LED driver feedback loop to stabilize reference current. Use Value: 50 pF CT avoids phase shift in op-amp compensation network, maintaining stability across temperature and dimming range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB120-E3/54 (Vishay) | 20 V VRRM, 1 A IF(AV), DO-41 package, VF = 0.55 V @ 1 A | Higher current rating but larger footprint; requires PCB layout revision for DO-41 pad geometry. | Select when higher surge tolerance (IFSM = 30 A) and thermal mass are needed in industrial power supplies. |
| BAT54C (Diodes Inc.) | 30 V VRRM, 200 mA IF(AV), SOT-23 package, VF = 0.33 V @ 10 mA | Surface-mount, dual-channel configuration; unsuitable for >200 mA average loads due to derating. | Choose for space-constrained, low-current bias networks where dual-diode integration reduces component count. |
Compared with SB120-E3/54 and BAT54C, SD103C-T offers optimal balance of DO-35 manufacturability, 350 mA sustained current, and 0.60 V VF at operational load - making it preferred for cost-sensitive, medium-power consumer adapters requiring legacy through-hole-compatible automation.
Availability
SD103C-T is available at Aetrix Electronics and suitable for USB PD interface protection, wireless charging receivers, IoT sensor node power management, and LED driver bias circuits requiring stable component supply and RoHS-compliant sourcing.
Supply support for SD103C-T 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, specializing in high-efficiency power management and signal integrity solutions for consumer, industrial, and automotive markets.
The SD103x series targets cost-optimized, high-reliability Schottky rectification in compact AC/DC and DC/DC converters where low VF, fast trr, and robust transient immunity are critical.
FAQ
What is the maximum junction temperature for SD103C-T?
The absolute maximum operating junction temperature is 125°C, validated under steady-state conditions with terminals held at ambient temperature. Derating is required above 75°C ambient; RθJA = 300°C/W implies ~150 mW usable power at 75°C ambient before reaching Tj limit.
Is SD103C-T suitable for automotive applications?
SD103C-T is not AEC-Q200 qualified and lacks automotive-grade screening or extended temperature grade certification. It may be used in non-safety-critical infotainment or accessory circuits only after full system-level qualification per customer requirements.
How does the guard ring construction improve reliability?
The guard ring physically isolates the main PN junction from the semiconductor surface, suppressing premature edge breakdown during voltage transients and improving resistance to humidity-induced leakage and ESD damage without adding external TVS components.
Can SD103C-T replace SD103A or SD103B in existing designs?
Yes, SD103C-T is pin- and footprint-compatible with SD103A-T and SD103B-T, but its lower 20 V VRRM requires verification that peak reverse voltage in the target circuit remains below this rating - especially in unregulated or line-voltage–referenced applications.
SD103C-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 350mA
- Voltage - Forward (Vf) (Max) @ If:
- 600 mV @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 10 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 10 V
- Capacitance @ Vr, F:
- 50pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
- Operating Temperature - Junction:
- 125°C (Max)
SD103C-T FAQ
1.How can I place an order for SD103C-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SD103C-T 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 SD103C-T reliable?
The price and inventory of SD103C-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD103C-T is usually 5 days.
3.What payment methods are accepted for SD103C-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD103C-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD103C-T?
SD103C-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD103C-T 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 SD103C-T?
For technical support, including SD103C-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD103C-T requirements.
6.How does Aetrix verify that SD103C-T is sourced from the original manufacturer or authorized distributors?
All SD103C-T 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 SD103C-T meets industry standards.
7.What is the process for return or replacement of SD103C-T?
All SD103C-T units undergo pre-shipment inspection (PSI). If there is an issue with SD103C-T, 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 SD103C-T part is unused and in its original packaging.
Return procedure for SD103C-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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