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Diodes Incorporated SDM03U40-7
- Part No.:
- SDM03U40-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SDM03U40-7.pdf
- Description:
- DIODE SCHOTTKY 30V 30MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:30,890
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Product details
Overview
SDM03U40-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in SOD-523 package, rated for 40 V peak reverse voltage, 30 mA average rectified current, and 290–370 mV forward voltage at 1 mA - ideal for low-voltage logic clamping and signal-level protection in space-constrained portable electronics.
For engineers reviewing the SDM03U40-7 datasheet, SDM03U40-7 pinout, SDM03U40-7 application, or SDM03U40-7 equivalent, key selection criteria include its 2 pF junction capacitance at 1 V, 0.5 µA max reverse leakage at 30 V, guard-ring die construction for transient immunity, and compatibility with high-speed digital I/O protection in battery-powered wearables and IoT sensor nodes.
Technical Context
This Schottky diode employs a planar guard-ring die structure to suppress edge breakdown and improve transient robustness without compromising low VF performance. Its ultra-low capacitance (2 pF @ 1 V) and fast switching behavior support ESD-tolerant signal line clamping in USB 2.0, I²C, and GPIO interfaces.
The device operates across –40 °C to +125 °C and delivers stable forward conduction down to 1 mA, making it suitable for biasing and level-shifting in low-power microcontroller peripheral circuits where thermal derating and leakage control are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Reverse Voltage | 40 V - defines maximum transient overvoltage the diode can block without avalanche breakdown |
| Forward Voltage (VF) | 290–370 mV @ 1 mA - enables efficient clamping of logic signals above 0.3 V while minimizing power loss |
| Junction Capacitance (Cj) | 2 pF @ 1 V, 1 MHz - preserves signal integrity in >100 MHz digital lines with minimal loading |
| Average Rectified Current | 30 mA - supports continuous DC bias or low-duty-cycle surge clamping in sensor interface paths |
| Reverse Leakage (IR) | ≤0.5 µA @ 30 V - ensures negligible standby current draw in always-on battery monitoring circuits |
| Thermal Resistance (RθJA) | 667 °C/W - requires minimal PCB copper area for thermal management in thin-profile wearable PCBs |
Pinout & Package
Package: SOD-523 - ultra-miniature plastic surface-mount package (1.6 × 1.2 × 0.7 mm), UL 94V-0 rated, matte tin-plated terminals, cathode marked with band and "LK" code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected signal line or positive rail in clamp-to-rail configurations |
| Cathode | Current exit point; marked with band and "LK" | Connected to reference node (e.g., VCC or GND) to define clamping threshold |
Key Features
| Feature | Design Value |
|---|---|
| Guard-ring die construction | Suppresses edge leakage and improves ESD robustness without increasing VF or Cj |
| Low forward voltage (290–370 mV) | Enables clamping of 1.8 V and 3.3 V logic signals with <0.4 V overhead loss |
| Ultra-low junction capacitance (2 pF) | Maintains rise/fall time integrity in high-speed data lines up to 200 Mbps |
| SOD-523 footprint | Reduces board area by >50% vs. SOD-323, enabling dense routing in compact RF modules |
Applications
| USB 2.0 Data Line Protection | I²C Bus Level Shifting |
|---|---|
Use Scenario: Protecting D+ and D− lines against ESD and cable-induced transients in portable USB peripherals. IC Role / Device Role / Timing Role: Bidirectional low-capacitance clamp diode tied between data line and VBUS/GND. Use Value: Prevents latch-up in USB transceivers while adding <0.5 ns propagation delay due to 2 pF Cj. | Use Scenario: Translating logic levels between 1.8 V microcontroller I/O and 3.3 V sensor interface. IC Role / Device Role / Timing Role: Passive level shifter using forward-biased Schottky conduction to offset voltage thresholds. Use Value: Achieves reliable bidirectional translation without active circuitry or timing skew. |
| RF Front-End Bias Clamping | Low-Power Sensor Signal Conditioning |
Use Scenario: Clamping RF amplifier input pins to prevent damage from antenna coupling transients. IC Role / Device Role / Timing Role: DC-blocking and transient suppression element placed before LNA input matching network. Use Value: Maintains 50 Ω impedance match with <0.1 dB insertion loss up to 2.4 GHz due to minimal Cj. | Use Scenario: Protecting ADC input channels in battery-operated environmental sensors from ESD and overvoltage events. IC Role / Device Role / Timing Role: Input-stage protection diode connected between analog input and reference rail. Use Value: Limits fault current to <10 µA during 8 kV HBM ESD event, preserving ADC accuracy and offset stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAT54C-7-F (Diodes Inc.) | Dual common-cathode configuration; 30 V VR; 200 mA IFSM; 300 mV VF @ 10 mA | Requires layout change for dual-channel use; higher VF at >1 mA reduces efficiency in sub-1 mA biasing | Preferred when dual-diode functionality or higher surge rating is needed |
| NSR0330HT1G (onsemi) | SOD-323 package; 30 V VR; 200 mA IFSM; 275 mV VF @ 1 mA; 3 pF Cj | Larger footprint increases board area; 1 pF higher capacitance limits >150 MHz signal fidelity | Selected when legacy SOD-323 placement compatibility is required |
Compared with BAT54C-7-F and NSR0330HT1G, SDM03U40-7 offers the smallest footprint and lowest capacitance for single-diode, high-density, high-speed signal protection - but has lower surge rating and no dual-diode option.
Availability
SDM03U40-7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, I²C level shifting, and RF front-end bias clamping requiring stable component supply and consistent parametric performance across temperature.
Supply support for SDM03U40-7 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, specializing in high-reliability, cost-optimized components for consumer, computing, and industrial markets.
The SDM03U40-7 belongs to Diodes' ultra-low-capacitance Schottky diode product line, engineered specifically for high-speed signal integrity and ESD-hardened I/O protection in miniaturized portable electronics.
FAQ
What is the maximum operating temperature for SDM03U40-7?
The SDM03U40-7 is rated for junction and storage temperatures from –40 °C to +125 °C. Its thermal resistance (RθJA = 667 °C/W) means ambient temperature must be limited to ≤85 °C at 30 mA DC load to maintain Tj ≤125 °C on standard FR-4 PCB with recommended pad layout.
Does SDM03U40-7 have a SPICE model available?
Yes - Diodes Incorporated provides an official SPICE model for SDM03U40-7 (designated "SDM03U40") in the datasheet DS30392 Rev. 1–2. The model includes temperature-dependent VF, Cj(VR), and reverse recovery behavior validated against characterization data across –40 °C to +125 °C.
Is SDM03U40-7 suitable for bidirectional ESD protection?
No - SDM03U40-7 is a unidirectional Schottky diode. For bidirectional ESD protection, two devices must be used in series opposition (anode-to-anode or cathode-to-cathode), or a dedicated TVS array like the D3V3Z1BQ-7 should be selected instead.
What does the marking code "LK" indicate on SDM03U40-7?
The "LK" marking on the SOD-523 package identifies the device as SDM03U40-7 per Diodes Incorporated's internal coding system. It appears adjacent to the cathode band and is used for traceability and visual orientation during automated optical inspection and pick-and-place assembly.
SDM03U40-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 30 V
- Current - Average Rectified (Io):
- 30mA
- Voltage - Forward (Vf) (Max) @ If:
- 370 mV @ 1 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 nA @ 30 V
- Capacitance @ Vr, F:
- 2pF @ 1V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- -40°C ~ 125°C
SDM03U40-7 FAQ
1.How can I place an order for SDM03U40-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM03U40-7 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 SDM03U40-7 reliable?
The price and inventory of SDM03U40-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM03U40-7 is usually 5 days.
3.What payment methods are accepted for SDM03U40-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM03U40-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM03U40-7?
SDM03U40-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM03U40-7 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 SDM03U40-7?
For technical support, including SDM03U40-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM03U40-7 requirements.
6.How does Aetrix verify that SDM03U40-7 is sourced from the original manufacturer or authorized distributors?
All SDM03U40-7 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 SDM03U40-7 meets industry standards.
7.What is the process for return or replacement of SDM03U40-7?
All SDM03U40-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM03U40-7, 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 SDM03U40-7 part is unused and in its original packaging.
Return procedure for SDM03U40-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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