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Diodes Incorporated SDM1U20CSP-7
- Part No.:
- SDM1U20CSP-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- 2-XDFN
- Datasheet:
-
SDM1U20CSP-7.pdf
- Description:
- DIODE SCHOTT 20V 1A X3-WLB1406-2
- Quantity:
- Payment:
- Shipping:
Inventory:8,690
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Product details
Overview
SDM1U20CSP-7 from Diodes Incorporated is a 20 V, 1.0 A Schottky barrier rectifier in chip-scale package (X3-WLB1406-2), optimized for low forward voltage (0.44 V @ 1.0 A) and low reverse leakage (100 µA @ 20 V). It serves as a blocking, boost, or reverse protection diode in space-constrained portable power rails.
For engineers reviewing the SDM1U20CSP-7 datasheet, SDM1U20CSP-7 pinout, SDM1U20CSP-7 application, or SDM1U20CSP-7 equivalent, key selection criteria include thermal resistance (73 °C/W on 1-in² copper), junction capacitance (76 pF @ 4 V), and compact 0.84 mm² board footprint - critical for battery-powered DC/DC converters and USB power switches.
Technical Context
This Schottky rectifier uses a planar metal–semiconductor junction to achieve fast switching with no minority-carrier storage delay. Its low VF minimizes conduction loss in high-frequency buck/boost stages, while its 150 °C max junction temperature supports operation in thermally dense mobile PCB layouts.
The X3-WLB1406-2 package features solderable top-side terminals with cathode dot marking and 0.30 mm typical standoff height. Thermal resistance drops from 140 °C/W (minimum pad) to 73 °C/W (1-in² copper), enabling higher current density without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum reverse blocking voltage before breakdown; suitable for 5 V and 12 V input rails with margin. |
| IO | 1.0 A - Continuous average forward current at TA = 25°C; derated to ~0.6 A at 85°C ambient. |
| VF Max | 0.44 V @ 1.0 A - Low conduction loss reduces I²R heating in portable device power paths. |
| IR Max | 100 µA @ 20 V - Low leakage preserves battery life in always-on standby circuits. |
| RθJA | 73 °C/W - Achievable with 1-in² 2 oz copper; enables 1 A operation without heatsink in handhelds. |
| CJ | 76 pF @ 4 V - Limits high-frequency switching noise in 1–3 MHz DC/DC converters. |
Pinout & Package
Package: X3-WLB1406-2 chip-scale package (CSP), 0.84 mm² footprint, 0.30 mm typical height, cathode marked with dot. Solderable top-side anode and cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to input/source side of rectification path; requires clean copper pour for thermal relief. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with dot; ties to output/load or ground return; defines polarity in reverse-protection schemes. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF (0.44 V) | Reduces power loss by >30% vs. standard silicon diodes at 1 A, extending battery runtime in wearables. |
| Low IR (100 µA @ 20 V) | Minimizes quiescent drain in always-on load switches, preserving shelf life of coin-cell-powered IoT sensors. |
| Thermal resistance (73 °C/W) | Enables 1 A continuous operation on compact 2-layer PCBs without thermal vias or external cooling. |
| Chip-scale packaging (0.84 mm²) | Replaces larger SOD-123 or SOD-323 diodes, freeing space for RF front-end or sensor integration. |
Applications
| USB Power Switching | Wireless Earbud Charging |
|---|---|
Use Scenario: Bidirectional power routing between USB-C port and Li-ion battery during charging and OTG modes. IC Role / Device Role / Timing Role: Reverse-polarity protection diode placed between VBUS and battery charger IC input. Use Value: 0.44 V VF limits voltage drop to <2% at 1 A, preserving charging efficiency; CSP footprint fits tight 3×3 mm earbud PCBs. | Use Scenario: Isolating charging circuitry from battery during case-based wireless charging to prevent backfeed. IC Role / Device Role / Timing Role: Blocking diode in series with Qi receiver output to prevent reverse current into battery protection FET. Use Value: 100 µA IR at 20 V ensures <1 µW standby loss, critical for multi-week shelf life in sealed earbud cases. |
| Smartwatch PMIC Input | BLE Beacon Power Path |
Use Scenario: Input rectification for buck converter supplying display and MCU from coin-cell or solar harvester. IC Role / Device Role / Timing Role: Boost diode in step-up converter feeding 3.3 V rail from 1.5–2.5 V energy sources. Use Value: 76 pF junction capacitance avoids resonance with 2.2 µH inductor at 2 MHz switching, maintaining stable regulation. | Use Scenario: Power-path OR-ing between CR2032 battery and energy-harvested capacitor in ultra-low-power asset trackers. IC Role / Device Role / Timing Role: Low-leakage OR-ing diode selecting highest available source while isolating depleted cells. Use Value: 73 °C/W RθJA allows full 1 A conduction during GPS burst transmission without thermal throttling on 4-layer modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB050M-30TR | Higher VF (0.55 V @ 1 A), larger SOD-523 package (1.6 mm²), 200 µA IR @ 20 V | Less suitable for space-constrained wearables; acceptable in industrial sensors with larger PCB area | Choose when cost sensitivity outweighs size/efficiency requirements |
| NSR1020HT1G | Same VF (0.44 V @ 1 A), but SOD-123 package (2.8 mm²), 200 µA IR @ 20 V, RθJA = 100 °C/W | Requires more board area and thermal relief; better for higher ambient temp environments with heatsinking | Prefer when legacy layout compatibility or higher surge rating (IFSM = 30 A) is required |
Compared with RB050M-30TR and NSR1020HT1G, SDM1U20CSP-7 delivers the smallest footprint and lowest leakage, making it optimal for miniaturized battery-powered devices where every 0.1 mm² and 1 µA matter - but requires precise CSP reflow profiling due to its wafer-level construction.
Availability
SDM1U20CSP-7 is available at Aetrix Electronics and suitable for USB power switching, wireless earbud charging, smartwatch PMIC input, and BLE beacon power path applications requiring stable component supply and long-term lifecycle support.
Supply support for SDM1U20CSP-7 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, headquartered in Plano, Texas, with design and manufacturing facilities across Asia and the Americas.
The SDM1U20CSP-7 belongs to Diodes' low-VF Schottky rectifier product line, engineered specifically for high-efficiency, space-constrained portable power management in consumer and IoT devices.
FAQ
What is the maximum operating temperature for SDM1U20CSP-7?
The SDM1U20CSP-7 has an operating junction temperature range of –55°C to +150°C. Its thermal resistance is 73 °C/W when mounted on 1-in² 2 oz copper, allowing reliable 1 A operation up to 85°C ambient without derating - verified per JEDEC JESD51-7 test conditions.
Does SDM1U20CSP-7 meet automotive qualification standards?
No - SDM1U20CSP-7 is not AEC-Q101 qualified. Diodes offers automotive-grade variants (e.g., SDM1U20Q3-7) with PPAP documentation and IATF 16949 manufacturing, but this part is intended for commercial portable electronics only.
How is polarity identified on the SDM1U20CSP-7 package?
Polarity is marked with a cathode dot on the top surface of the X3-WLB1406-2 package. The dot aligns with the cathode terminal; the opposite side is the anode. No silkscreen or outline is used - orientation must be confirmed via optical inspection or X-ray prior to reflow.
Can SDM1U20CSP-7 replace a standard SOD-123 Schottky diode?
Yes, functionally - but not mechanically. It matches electrical specs (20 V, 1 A, 0.44 V VF), yet requires CSP-specific stencil design, placement accuracy ±0.05 mm, and reflow profile tuned for wafer-level packaging. Board redesign is needed for footprint and solder mask.
SDM1U20CSP-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 2-XDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 440 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 20 V
- Capacitance @ Vr, F:
- 76pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X3-WLB1406-2
- Operating Temperature - Junction:
- -55°C ~ 150°C
SDM1U20CSP-7 FAQ
1.How can I place an order for SDM1U20CSP-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM1U20CSP-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 SDM1U20CSP-7 reliable?
The price and inventory of SDM1U20CSP-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM1U20CSP-7 is usually 5 days.
3.What payment methods are accepted for SDM1U20CSP-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM1U20CSP-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM1U20CSP-7?
SDM1U20CSP-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM1U20CSP-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 SDM1U20CSP-7?
For technical support, including SDM1U20CSP-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM1U20CSP-7 requirements.
6.How does Aetrix verify that SDM1U20CSP-7 is sourced from the original manufacturer or authorized distributors?
All SDM1U20CSP-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 SDM1U20CSP-7 meets industry standards.
7.What is the process for return or replacement of SDM1U20CSP-7?
All SDM1U20CSP-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM1U20CSP-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 SDM1U20CSP-7 part is unused and in its original packaging.
Return procedure for SDM1U20CSP-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM1U20CSP-7 Tags
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