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Diodes Incorporated SD103C-A-F
- Part No.:
- SD103C-A-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
SD103C-A-F.pdf
- Description:
- DIODE SCHOTTKY 20V 350MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,275
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Product details
Overview
SD103C-A-F from Diodes Incorporated is a glass-passivated Schottky barrier diode in DO-35 package, rated for 20 V peak repetitive reverse voltage, 350 mA forward continuous current, and 10 ns reverse recovery time; it delivers low forward voltage drop (0.60 V at 200 mA) and 50 pF junction capacitance, used in high-efficiency DC-DC converter output rectification and low-voltage power rail clamping.
For engineers reviewing the SD103C-A-F datasheet, SD103C-A-F pinout, SD103C-A-F application, or SD103C-A-F equivalent, key selection criteria include verified VRRM=20 V, IFM=350 mA, trr=10 ns, CT=50 pF, and DO-35 mechanical compatibility with legacy through-hole layouts requiring fast switching and low-loss rectification.
Technical Context
This Schottky diode employs guard ring construction to enhance transient voltage immunity and suppress leakage-induced thermal runaway under surge conditions. Its low forward voltage drop stems from optimized metal-semiconductor junction design, enabling reduced conduction loss in 3.3 V and 5 V power rails.
The device operates within −55 °C to +125 °C junction temperature range and exhibits stable reverse characteristics up to VR = 10 V (IRM ≤ 5.0 μA), with thermal resistance RθJA = 300 °C/W confirming suitability for natural-convection PCB layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse blocking voltage before avalanche; defines safe operating limit in clamp or flyback snubber circuits. |
| IFM | 350 mA - Continuous forward current rating; sets maximum steady-state load current without thermal derating on standard FR-4. |
| trr | 10 ns - Measured reverse recovery time at IF = IR = 50–200 mA; enables operation in >1 MHz switching converters with minimal switching loss. |
| VFM | 0.60 V @ 200 mA - Forward voltage at rated load; directly determines I²R conduction loss and thermal rise in low-voltage rectifiers. |
| CT | 50 pF @ 0 V, 1 MHz - Junction capacitance; impacts high-frequency noise coupling and EMI filter design in SMPS feedback paths. |
| IRM | 5.0 μA @ VR = 10 V - Peak reverse leakage at rated DC blocking voltage; critical for battery-powered hold-up and standby power budgeting. |
Pinout & Package
DO-35 glass axial package with cathode band marking; hermetically sealed glass body, Sn96.5Ag3.5 lead finish, moisture sensitivity level 1, weight ≈ 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node (e.g., switch node in buck converter); must withstand IFSM = 15 A surge without bond wire fusing. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to output rail or ground reference; reverse voltage applied here must stay ≤20 V to avoid breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Suppresses edge leakage and improves surge survivability during ESD or inductive kick events in automotive load-dump environments. |
| Low VFM (0.60 V @ 200 mA) | Reduces forward power loss by ≥30% vs. comparable silicon diodes, extending battery runtime in portable 3.3 V logic supplies. |
| 10 ns trr | Enables clean zero-crossing switching in 1–3 MHz DC-DC controllers without tail current distortion or shoot-through risk. |
| DO-35 glass package | Provides hermetic seal and thermal stability for industrial control modules exposed to humidity or thermal cycling. |
Applications
| USB Power Delivery Clamp | Industrial Sensor Bias Supply |
|---|---|
Use Scenario: Clamps transient overvoltage on USB VBUS line during hot-plug or ESD events. IC Role / Device Role / Timing Role: Fast-switching unidirectional clamp diode placed between VBUS and system ground. Use Value: 10 ns trr ensures clamping activation before downstream LDO or USB controller damage; 20 V VRRM matches USB PD 3.0 max bus voltage. | Use Scenario: Provides reverse-polarity protection and low-loss bias path for 4–20 mA loop-powered sensors. IC Role / Device Role / Timing Role: Series-connected Schottky rectifier in sensor front-end power path. Use Value: 0.60 V VFM minimizes voltage headroom loss across 24 V supply, preserving ≥23.4 V for analog signal conditioning circuitry. |
| Low-Voltage DC-DC Output Rectifier | Automotive Body Control Module Rail Clamp |
Use Scenario: Synchronous rectifier replacement in 5 V/3.3 V buck converter secondary side. IC Role / Device Role / Timing Role: Low-loss freewheeling diode conducting during high-side FET off-time. Use Value: 50 pF CT limits high-frequency ringing on output LC filter; 350 mA IFM supports up to 3 W output power at full load. | Use Scenario: Suppresses load-dump transients on 12 V microcontroller supply rail in BCM subassemblies. IC Role / Device Role / Timing Role: Transient voltage clamp connected anode-to-rail, cathode-to-ground. Use Value: Guard ring structure withstands 15 A IFSM surges per ISO 7637-2 Pulse 5a; DO-35 glass body resists under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5817 | VRRM = 20 V, IFM = 1.0 A, trr ≈ 10 ns, DO-41 package (larger footprint) | Higher current rating but larger DO-41 body; requires PCB pad revision | Select when board layout allows larger axial package and >350 mA average load is needed. |
| SB120 | VRRM = 20 V, IFM = 1.0 A, trr < 5 ns, DO-41, higher cost | Superior speed and current, but not RoHS-compliant lead finish (SnPb) | Choose only for legacy automotive programs requiring SnPb soldering and sub-5 ns recovery. |
Compared with 1N5817 and SB120, SD103C-A-F offers identical 20 V blocking and 10 ns recovery in a smaller DO-35 footprint with RoHS-compliant Sn96.5Ag3.5 leads-ideal for space-constrained, modern industrial PCBs where thermal mass and lead-free compliance are mandatory.
Availability
SD103C-A-F is available at Aetrix Electronics and suitable for USB power delivery clamping, industrial sensor bias supplies, low-voltage DC-DC output rectification, and automotive body control module rail protection requiring stable component supply across production lifecycles.
Supply support for SD103C-A-F 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-reliability power management, signal integrity, and protection devices for industrial and automotive markets.
SD103C-A-F belongs to the SD103x Schottky barrier diode product line, engineered for low-loss, high-speed rectification and transient suppression in compact through-hole power interfaces.
FAQ
What is the maximum allowable junction temperature for SD103C-A-F?
The absolute maximum operating junction temperature is +125 °C, validated per JEDEC JESD22-A104. Derating begins above 75 °C ambient when mounted on standard 1 oz copper FR-4 with 0.5 cm² pad area; sustained operation beyond 125 °C risks parametric shift and premature failure.
Is SD103C-A-F suitable for surface-mount reflow assembly?
No-SD103C-A-F uses a DO-35 glass axial package with radial leads designed for through-hole insertion and wave or selective soldering. It is not rated for standard Pb-free reflow profiles (e.g., JEDEC J-STD-020 Level 3), and thermal shock may crack the glass body during peak reflow exposure.
How does the guard ring construction improve reliability?
The integrated guard ring reduces electric field crowding at the semiconductor edge, lowering leakage current under high reverse bias and improving resistance to transient-induced localized heating. This extends operational life in automotive load-dump and industrial motor-drive snubber applications where repetitive 15 A surges occur.
Can SD103C-A-F replace SD103A or SD103B in existing designs?
Yes, with voltage derating: SD103C-A-F (VRRM = 20 V) can substitute for SD103A (40 V) or SD103B (30 V) only if the circuit's maximum reverse voltage never exceeds 20 V. Forward characteristics and package are identical; no layout change is needed, but system-level voltage margin verification is required.
SD103C-A-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Discontinued at Digi-Key
- 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-A-F FAQ
1.How can I place an order for SD103C-A-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SD103C-A-F 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-A-F reliable?
The price and inventory of SD103C-A-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD103C-A-F is usually 5 days.
3.What payment methods are accepted for SD103C-A-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD103C-A-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD103C-A-F?
SD103C-A-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD103C-A-F 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-A-F?
For technical support, including SD103C-A-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD103C-A-F requirements.
6.How does Aetrix verify that SD103C-A-F is sourced from the original manufacturer or authorized distributors?
All SD103C-A-F 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-A-F meets industry standards.
7.What is the process for return or replacement of SD103C-A-F?
All SD103C-A-F units undergo pre-shipment inspection (PSI). If there is an issue with SD103C-A-F, 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-A-F part is unused and in its original packaging.
Return procedure for SD103C-A-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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