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Diodes Incorporated SD103B
- Part No.:
- SD103B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
SD103B.pdf
- Description:
- DIODE SCHOTTKY 30V 350MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,648
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Product details
Overview
SD103B from Diodes Incorporated is a 30 V peak repetitive reverse voltage, low-forward-voltage Schottky barrier diode in DO-35 glass package, rated for 350 mA continuous forward current and 15 A non-repetitive surge, with 10 ns reverse recovery time and 50 pF junction capacitance at 0 V - used in high-efficiency DC-DC converter output rectification and low-voltage power rail clamping.
For engineers reviewing the SD103B datasheet, SD103B pinout, SD103B application, or SD103B equivalent, key selection criteria include verified VRRM=30 V, VF=0.60 V @ 200 mA, IR=5.0 μA @ VR=20 V, trr=10 ns, and DO-35 mechanical compatibility in space-constrained analog and power management circuits.
Technical Context
This Schottky diode leverages platinum-silicide or similar low-barrier metal-semiconductor junction to achieve sub-0.6 V forward drop at 200 mA while maintaining 30 V blocking capability. Its guard ring construction suppresses edge breakdown and improves transient robustness without requiring external TVS components.
The DO-35 glass package enables stable thermal resistance (RθJA = 300 °C/W) and moisture-insensitive operation (J-STD-020C Level 1), supporting reliable performance in ambient temperatures from –55 °C to +125 °C junction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - maximum repetitive reverse voltage before avalanche; defines safe DC/peak AC blocking in 24 V system rails. |
| IF(AV) | 350 mA - average forward current rating; sets continuous power delivery limit in low-power SMPS outputs. |
| VF | 0.60 V @ 200 mA - measured forward voltage; directly reduces conduction loss versus silicon diodes in 3.3–5 V buck converters. |
| trr | 10 ns - reverse recovery time; enables efficient high-frequency switching (>1 MHz) without tail current losses. |
| CT | 50 pF @ 0 V, 1 MHz - junction capacitance; impacts EMI and switching node ringing in fast-edge applications. |
| IRM | 5.0 μA @ VR = 20 V - peak reverse leakage; ensures minimal standby power drain in battery-backed circuits. |
Pinout & Package
DO-35 glass axial package: hermetically sealed, cathode-banded end, Sn96.5Ag3.5 solderable leads, 0.13 g mass, 25.4 mm overall length, 4.0 mm max body diameter, 2.0 mm max lead diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node (e.g., switch node in buck topology); must withstand 15 A surge during fault conditions. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; tied to output rail or ground return; holds off 30 V continuously and blocks leakage <5 μA at 20 V. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | VF ≤ 0.60 V @ 200 mA - cuts conduction loss by ~40% vs. comparable silicon diodes, improving efficiency in portable 3.3 V supplies. |
| Guard ring construction | Integrated edge termination - prevents premature surface breakdown under voltage transients, eliminating need for external snubbers in 24 V industrial IO modules. |
| Fast reverse recovery | trr = 10 ns - supports clean turn-off in 500 kHz–2 MHz DC-DC controllers without shoot-through risk or excessive EMI. |
| RoHS-compliant finish | Sn96.5Ag3.5 lead plating - meets lead-free assembly requirements and passes MIL-STD-202 Method 208 solderability testing. |
Applications
| USB Power Delivery Clamp | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping transient overvoltage on USB 2.0 VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between VBUS and GND, leveraging low VF and fast trr to clamp spikes <30 V without latch-up. Use Value: Prevents damage to downstream USB controller ICs by limiting excursion to ≤30 V with <5 μA leakage at nominal 5 V. | Use Scenario: Protecting analog front-end inputs of 4–20 mA current loop transmitters from ESD and cable-induced surges. IC Role / Device Role / Timing Role: Low-capacitance (50 pF) input protection diode shunting to rail, operating in reverse bias during normal signal range (0–24 V). Use Value: Maintains signal integrity below 1 MHz while clamping ±8 kV HBM ESD pulses via guard ring-enhanced edge robustness. |
| Low-Voltage DC-DC Output Rectifier | Automotive Body Control Module Rail Clamp |
Use Scenario: Synchronous rectifier replacement in 3.3 V/1 A buck converter for FPGA I/O supply. IC Role / Device Role / Timing Role: Freewheeling diode conducting during high-side FET off-time; handles 350 mA avg and 15 A surge during short-circuit events. Use Value: Delivers 0.60 V VF at full load, reducing power loss by 210 mW versus 1N5819, extending thermal margin in sealed enclosures. | Use Scenario: Reverse polarity and load dump protection on 12 V auxiliary rail in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Cathode-to-rail configuration blocking reverse battery connection; rated for 30 V continuous and 15 A surge per ISO 7637-2 pulse 5a. Use Value: Survives 35 V/100 ms load dump transients without degradation due to RθJA = 300 °C/W and glass-package thermal stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5817 | VRRM = 20 V, VF = 0.475 V @ 1 A, trr ≈ 30 ns, DO-41 package | Limited to ≤12 V systems; slower recovery increases switching loss above 500 kHz | Prefer when cost sensitivity outweighs 30 V margin and high-frequency performance. |
| SB130 | VRRM = 30 V, IF(AV) = 1 A, VF = 0.85 V @ 1 A, DO-41 package | Higher VF raises conduction loss in low-voltage rails; larger DO-41 footprint limits PCB density | Choose only when 1 A average current is required and board space permits larger package. |
Compared with 1N5817 and SB130, SD103B uniquely balances 30 V blocking, 0.60 V VF at 200 mA, 10 ns trr, and DO-35 miniaturization - making it optimal for compact, high-efficiency 24 V-input DC-DC stages where thermal and EMI constraints are critical.
Availability
SD103B is available at Aetrix Electronics and suitable for USB power delivery protection, industrial sensor interfaces, low-voltage DC-DC output rectification, and automotive body control module rail clamping requiring stable component supply across production lifecycles.
Supply support for SD103B 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 solutions for industrial and consumer markets.
The SD103x series belongs to Diodes' general-purpose Schottky diode product line, engineered for cost-sensitive, space-constrained applications demanding low VF, fast switching, and robust transient immunity in harsh environments.
FAQ
Is SD103B suitable for use in synchronous rectification topologies?
No - SD103B is a passive Schottky diode and lacks gate control or integrated drive circuitry required for synchronous rectification. It functions as a freewheeling or clamp diode in non-synchronous buck/boost converters, where its 10 ns trr and 0.60 V VF optimize efficiency up to ~2 MHz switching frequency without active timing control.
What is the maximum allowable junction temperature during surge conditions?
The absolute maximum junction temperature remains 125 °C under all conditions, including 15 A IFSM surge. Thermal design must ensure that single-pulse energy (I²t ≈ 1.875 A²·s for 8.3 ms half-sine) does not cause localized heating beyond this limit - verified via transient thermal impedance curves in DS11009 Rev. 13.
Does SD103B have qualified AEC-Q101 stress test data for automotive use?
No - SD103B is not AEC-Q101 qualified. While its 125 °C Tj rating and glass DO-35 package support under-hood ambient conditions, Diodes Incorporated lists it as industrial-grade; automotive designs requiring qualification should consider AEC-Q101-certified alternatives like the AP103B or SB330.
Can SD103B replace SD103A in a 40 V-rated circuit?
No - SD103B has VRRM = 30 V, insufficient for 40 V peak reverse stress. Substituting it for SD103A risks avalanche breakdown and parametric failure. The 10 V reduction reflects intentional derating for lower-cost manufacturing; no internal structure modification enables cross-voltage substitution.
SD103B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 30 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 @ 20 V
- Capacitance @ Vr, F:
- 50pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
- Operating Temperature - Junction:
- 125°C (Max)
SD103B FAQ
1.How can I place an order for SD103B through Aetrix?
Please submit a Request for Quotation (RFQ) for SD103B 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 SD103B reliable?
The price and inventory of SD103B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD103B is usually 5 days.
3.What payment methods are accepted for SD103B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD103B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD103B?
SD103B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD103B 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 SD103B?
For technical support, including SD103B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD103B requirements.
6.How does Aetrix verify that SD103B is sourced from the original manufacturer or authorized distributors?
All SD103B 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 SD103B meets industry standards.
7.What is the process for return or replacement of SD103B?
All SD103B units undergo pre-shipment inspection (PSI). If there is an issue with SD103B, 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 SD103B part is unused and in its original packaging.
Return procedure for SD103B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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