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Diodes Incorporated SDM05U20S3-7
- Part No.:
- SDM05U20S3-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SDM05U20S3-7.pdf
- Description:
- DIODE SCHOTTKY 20V 500MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,154
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Product details
Overview
SDM05U20S3 from Diodes Incorporated is a 0.5A, 20V Schottky barrier rectifier in SOD323 package, delivering low forward voltage (0.39 V at 0.5 A) and low reverse leakage (160 µA at 20 V), optimized for high-efficiency DC-DC conversion and low-voltage rectification in space-constrained power supplies.
For engineers reviewing the SDM05U20S3 datasheet, SDM05U20S3 pinout, SDM05U20S3 application, or SDM05U20S3 equivalent, key selection criteria include VF vs. temperature stability, junction-to-ambient thermal resistance (240 °C/W on 1-in² Cu pad), reverse recovery speed (Schottky, no minority carrier storage), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Schottky rectifier uses a planar epitaxial construction with low-barrier metal-semiconductor junction to achieve fast switching (no reverse recovery time), minimal conduction loss, and stable performance across -55°C to +150°C operating range. Its 20 V VRRM rating targets low-voltage rail applications such as 3.3 V and 5 V DC-DC outputs.
The device exhibits strong thermal derating behavior: maximum reverse voltage drops to ~12 V at +125°C (Fig. 4), and leakage current rises to 1000 µA at 150°C (extrapolated from Fig. 2), requiring careful thermal layout design on FR-4 with 1-inch² copper pad for rated 0.5 A operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum blocking voltage before breakdown; sets upper limit for input/output rail separation in buck/boost converters. |
| IO (Avg) | 0.5 A - Continuous DC output current capability with proper PCB thermal management (240 °C/W RθJA). |
| VF Max | 0.39 V @ 0.5 A, 25°C - Low conduction loss enables >95% efficiency in 3.3 V/5 V point-of-load designs. |
| IR Max | 160 µA @ 20 V, 25°C - Enables low standby power in always-on circuits; increases to ~1000 µA at 150°C. |
| CT | 60 pF @ 5 V, 1 MHz - Low junction capacitance minimizes switching noise and EMI in high-frequency SMPS (>1 MHz). |
| RθJA | 240 °C/W - Achieved with 1-inch² 2 oz. Cu pad; dictates minimum copper area needed to maintain TJ < 150°C at full load. |
| IFSM | 18 A @ 8.3 ms - Withstands inrush currents in hot-swap and USB-powered systems without degradation. |
Pinout & Package
Package: SOD323 - ultra-compact surface-mount plastic case (1.30 × 1.70 × 0.30 mm), cathode-band marked, matte tin-plated alloy-42 leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry node during forward conduction | Connected to lower-potential side (e.g., switch node in synchronous buck); requires low-inductance trace routing. |
| Cathode | Current exit node; marked by band | Connected to output rail or ground return; polarity must be verified during placement to avoid reverse bias failure. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF (0.35 V typ @ 0.5 A) | Reduces I²R losses by >40% vs. standard PN diodes, lowering thermal stress in dense power modules. |
| AEC-Q101 qualified | Validated for automotive under-hood applications including infotainment power rails and body control modules. |
| Halogen- and antimony-free "Green" | Meets EU Directive 2011/65/EU (RoHS 2) with Br+Cl < 1500 ppm and Sb < 1000 ppm - supports eco-compliance reporting. |
| SOD323 footprint | Enables miniaturized layouts compatible with 0402-class board area; reduces parasitic inductance vs. larger SOD-123. |
Applications
| Low-Voltage Rectification | High-Efficiency DC-DC Conversion |
|---|---|
Use Scenario: Output rectification in 3.3 V/1 A buck converter powering FPGA I/O banks. IC Role / Device Role / Timing Role: Unidirectional current path replacing synchronous MOSFET in cost-sensitive designs; conducts only during switch off-time. Use Value: 0.39 V VF limits conduction loss to <390 mW, avoiding thermal throttling on compact PCBs. | Use Scenario: Secondary-side rectification in isolated 5 V/0.5 A flyback supply for IoT sensor nodes. IC Role / Device Role / Timing Role: Freewheeling diode clamping transformer reset energy; operates at 100–500 kHz switching frequency. Use Value: 60 pF CT and zero reverse recovery minimize switching loss and EMI generation in battery-powered systems. |
| Switch Mode Power Supply | Inverse Polarity Protection |
Use Scenario: Input protection and OR-ing function in dual-input 12 V SMPS for industrial controllers. IC Role / Device Role / Timing Role: Forward-biased during normal operation; blocks reverse current during input fault or hot-swap events. Use Value: 160 µA IR at 20 V ensures <3.2 µW standby dissipation, critical for energy-harvesting auxiliary rails. | Use Scenario: Reverse-voltage guard on USB-C VBUS line in portable medical monitors. IC Role / Device Role / Timing Role: Cathode tied to system VBUS, anode to connector - blocks -20 V faults while passing +5 V normally. Use Value: 20 V VRRM withstands USB transient surges (IEC 61000-4-5 Level 2), and 18 A IFSM handles plug-in spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB520S30T1G | Same SOD323 package; 30 V VRRM, 0.2 A IO, 0.33 V VF @ 0.1 A | Higher voltage margin but lower current rating - unsuitable for 0.5 A continuous loads | Select only if system requires >25 V blocking and load current ≤0.2 A. |
| NSR0520HT1G | Same 20 V/0.5 A rating; 0.32 V VF @ 0.5 A; slightly higher IR (200 µA) | Identical thermal and electrical envelope; RoHS-compliant but not AEC-Q101 qualified | Prefer for commercial-grade applications where automotive qualification is unnecessary. |
Compared with RB520S30T1G and NSR0520HT1G, SDM05U20S3 uniquely balances 0.5 A current handling, 20 V rating, AEC-Q101 compliance, and industry-low 0.39 V VF - making it optimal for thermally constrained automotive and industrial DC-DC outputs.
Availability
SDM05U20S3 is available at Aetrix Electronics and suitable for low-voltage rectification, high-efficiency DC-DC conversion, and inverse polarity protection requiring stable component supply in automotive, industrial control, and portable electronics programs.
Supply support for SDM05U20S3 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.
SDM05U20S3 belongs to Diodes' Schottky rectifier product line, engineered for low-loss, high-speed power conversion in space- and thermally-constrained applications such as automotive infotainment and industrial SMPS.
FAQ
What is the maximum ambient temperature for continuous 0.5 A operation?
At 0.5 A DC, SDM05U20S3 requires RθJA ≤ 240 °C/W to hold junction temperature below 150°C. With the recommended 1-inch² 2 oz. Cu pad, maximum ambient temperature is +85°C. On standard FR-4 (RθJA = 400 °C/W), ambient must be limited to +55°C to avoid thermal runaway.
Is SDM05U20S3 suitable for synchronous rectification replacement?
No - SDM05U20S3 is a passive Schottky rectifier and cannot replace active synchronous MOSFETs. It lacks gate control and cannot be turned off. However, its low VF and zero reverse recovery make it a robust alternative where gate drive complexity or cost prohibits synchronous design.
Does the SOD323 package support reflow soldering per J-STD-020?
Yes - SDM05U20S3 is rated Moisture Sensitivity Level 1 (MSL-1), meaning it can be stored indefinitely at ≤30°C/85% RH and withstand standard Pb-free reflow profiles (peak 260°C) without baking or special handling.
How does leakage current change at elevated temperature?
IR increases exponentially with temperature: from 160 µA at 25°C and 20 V to ~100 µA at 85°C, ~350 µA at 125°C, and ~1000 µA at 150°C (per Fig. 2 extrapolation). This must be factored into standby power budgets for high-temperature deployments.
SDM05U20S3-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 390 mV @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 160 µA @ 20 V
- Capacitance @ Vr, F:
- 10pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- -55°C ~ 150°C
SDM05U20S3-7 FAQ
1.How can I place an order for SDM05U20S3-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM05U20S3-7 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 SDM05U20S3-7 reliable?
The price and inventory of SDM05U20S3-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM05U20S3-7 is usually 5 days.
3.What payment methods are accepted for SDM05U20S3-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM05U20S3-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM05U20S3-7?
SDM05U20S3-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM05U20S3-7 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 SDM05U20S3-7?
For technical support, including SDM05U20S3-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM05U20S3-7 requirements.
6.How does Aetrix verify that SDM05U20S3-7 is sourced from the original manufacturer or authorized distributors?
All SDM05U20S3-7 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 SDM05U20S3-7 meets industry standards.
7.What is the process for return or replacement of SDM05U20S3-7?
All SDM05U20S3-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM05U20S3-7, 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 SDM05U20S3-7 part is unused and in its original packaging.
Return procedure for SDM05U20S3-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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