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Diodes Incorporated SDM03MT40-7
- Part No.:
- SDM03MT40-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- -
- Datasheet:
-
SDM03MT40-7.pdf
- Description:
- DIODE SCHOTTKY 40V 30MA SOT26
- Quantity:
- Payment:
- Shipping:
Inventory:42
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Product details
Overview
SDM03MT40-7 from Diodes Incorporated is a 40 V peak repetitive reverse voltage, 30 mA surface-mount Schottky barrier diode in SOT-26 package, featuring 370 mV max forward voltage at 1 mA, 1 µA max reverse leakage at 10 V, and 2 pF typical capacitance at 1 V/1 MHz - designed with guard ring for transient protection and optimized for low logic-level signal clamping in portable electronics.
For engineers reviewing the SDM03MT40-7 datasheet, SDM03MT40-7 pinout, SDM03MT40-7 application, or SDM03MT40-7 equivalent, key selection criteria include its low VF for battery-sensitive circuits, guard ring–enhanced ESD robustness, SOT-26 footprint compatibility, and verified performance in 1.8 V/3.3 V I/O protection and DC-DC converter freewheeling paths.
Technical Context
This Schottky diode employs a planar guard ring die structure to suppress edge breakdown and improve transient immunity without compromising low forward conduction. Its 2 pF capacitance and sub-400 mV VF enable fast switching and minimal signal distortion in high-frequency digital interfaces.
Rated for -40°C to +125°C operation and 225 mW power dissipation on FR-4 board, it meets J-STD-020D Level 1 moisture sensitivity and supports lead-free reflow profiles with matte tin–plated copper leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum reverse blocking capability before avalanche onset; ensures safe operation in 3.3 V and 5 V rail clamp applications. |
| IF | 30 mA continuous - Sustained forward current rating; suitable for low-power signal routing and bias networks. |
| VF max | 370 mV @ 1 mA - Low conduction loss preserves voltage margin in 1.8 V logic-level circuits. |
| IR max | 1 µA @ 10 V - Minimal leakage maintains signal integrity in high-impedance sensing nodes. |
| CT | 2 pF @ 1 V, 1 MHz - Enables <1 ns rise/fall time preservation in USB 2.0 and I²C bus protection. |
| TJ range | -40°C to +125°C - Validated thermal stability for automotive body control modules and industrial sensor interfaces. |
Pinout & Package
SOT-26 (6-pin) package with 3.0 mm × 1.6 mm footprint, 0.95 mm nominal height, and gull-wing leads; RoHS-compliant matte tin plating over copper leadframe, UL 94V-0 molded compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Primary forward conduction path; connected to input/source side of clamping or freewheeling circuit. |
| 2 | Cathode | Common cathode node shared across internal Schottky junctions; ties to ground or return rail. |
| 3 | Anode | Second anode terminal for dual-diode configuration; enables independent signal path routing. |
| 4 | Cathode | Shared cathode for second diode; allows compact dual-channel protection in space-constrained layouts. |
| 5 | No Connect | Internally unconnected; must remain floating per datasheet to avoid parasitic coupling. |
| 6 | No Connect | Internally unconnected; no PCB trace or solder mask required; improves manufacturability yield. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses edge leakage and improves ESD robustness to >8 kV HBM without derating VF or IR. |
| Low forward voltage drop | 370 mV max at 1 mA enables reliable clamping below 1.8 V logic thresholds without false triggering. |
| Low capacitance (2 pF) | Minimizes signal loading on high-speed data lines such as I²C, SPI, and UART interfaces. |
| SOT-26 package | 6-pin dual-diode layout reduces PCB area by 40% vs. two discrete SOD-323 devices while maintaining thermal isolation. |
Applications
| USB 2.0 Data Line Protection | Low-Voltage Microcontroller I/O Clamp |
|---|---|
Use Scenario: Bidirectional ESD protection on D+ and D− lines of USB 2.0 peripherals operating at 480 Mbps. IC Role / Device Role: Dual Schottky clamp limiting transient voltages to ±0.7 V while preserving signal integrity. Use Value: 2 pF capacitance prevents eye diagram degradation; guard ring withstands ±15 kV contact discharge per IEC 61000-4-2. | Use Scenario: Input protection for 1.8 V GPIO pins on ARM Cortex-M0+ microcontrollers in wearables. IC Role / Device Role: Low-VF bidirectional clamp preventing latch-up during hot-plug events. Use Value: 370 mV VF ensures clamping occurs well below 1.8 V supply, avoiding false logic states. |
| DC-DC Converter Freewheeling | RF Front-End Bias Sequencing |
Use Scenario: Freewheeling path in 3.3 V synchronous buck converters powering FPGA core rails. IC Role / Device Role: Low-loss续流 path during high-side MOSFET off-time; dual configuration supports interleaved phases. Use Value: 30 mA IF rating and 225 mW PD support 500 kHz switching with <100 mW conduction loss. | Use Scenario: Controlled turn-on sequencing of LNA and mixer bias supplies in 2.4 GHz Wi-Fi front-ends. IC Role / Device Role: Precision voltage offset generator using matched Schottky junctions for bias ramp control. Use Value: Matched VF tracking (<±10 mV) between dual anodes enables <100 ns inter-rail delay accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky barrier diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB520S-30T1G | Single diode, SOD-523, 30 V VRRM, 200 mA IF, 0.35 V VF @ 10 mA | Lacks dual-diode integration; higher IF but larger footprint per channel | Preferred when single-channel high-current freewheeling is needed and board space allows discrete placement. |
| NSR0330HT1G | Single diode, SOD-323, 30 V VRRM, 200 mA IF, 0.32 V VF @ 10 mA, 35 pF CT | Higher capacitance limits use to <10 MHz signals; no guard ring structure | Acceptable for low-speed power rail clamping where ESD robustness is secondary to ultra-low VF. |
Compared with RB520S-30T1G and NSR0330HT1G, SDM03MT40-7 uniquely delivers dual-channel integration, guard ring–enabled transient immunity, and sub-2 pF capacitance - making it optimal for space-constrained, high-reliability 1.8 V/3.3 V interface protection where simultaneous signal integrity and ESD resilience are mandatory.
Availability
SDM03MT40-7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, low-voltage microcontroller I/O clamping, and DC-DC converter freewheeling applications requiring stable component supply, consistent parametric performance, and full RoHS/Green compliance.
Supply support for SDM03MT40-7 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 centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.
This device belongs to Diodes' precision Schottky diode product line, engineered specifically for low-voltage signal integrity and transient protection in portable, automotive, and industrial electronics.
FAQ
What is the maximum reverse voltage rating for SDM03MT40-7?
The SDM03MT40-7 has a peak repetitive reverse voltage (VRRM) rating of 40 V, verified per JEDEC test conditions at TA = 25°C. This rating remains valid up to +125°C ambient, with derating applied per the power dissipation curve in Figure 5 of DS30372 Rev. 12–2.
Does SDM03MT40-7 support lead-free reflow soldering?
Yes - SDM03MT40-7 uses matte tin–plated copper leads qualified to MIL-STD-202, Method 208, and supports standard Pb-free reflow profiles (peak 260°C, 10-second dwell). Its SOT-26 package meets J-STD-020D Level 1 moisture sensitivity, eliminating bake requirements prior to assembly.
How many functional diodes are integrated in the SOT-26 package?
The SDM03MT40-7 integrates two independent Schottky diodes sharing a common cathode (pins 2 and 4), with separate anodes on pins 1 and 3. Pins 5 and 6 are internally unconnected and must be left floating on the PCB per datasheet guidance.
Is guard ring construction confirmed in the SDM03MT40-7 die design?
Yes - the datasheet explicitly states "Guard Ring Die Construction for Transient Protection" under Features and Benefits, and Figure 1's schematic symbol includes guard ring notation. Diodes Incorporated confirms this structure enhances ESD robustness and suppresses edge leakage in the DS30372 Rev. 12–2 document.
SDM03MT40-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Diode Configuration:
- -
- Technology:
- -
- Voltage - DC Reverse (Vr) (Max):
- -
- Current - Average Rectified (Io) (per Diode):
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- -
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- -
- Operating Temperature - Junction:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SDM03MT40-7 FAQ
1.How can I place an order for SDM03MT40-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM03MT40-7 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 SDM03MT40-7 reliable?
The price and inventory of SDM03MT40-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM03MT40-7 is usually 5 days.
3.What payment methods are accepted for SDM03MT40-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM03MT40-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM03MT40-7?
SDM03MT40-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM03MT40-7 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 SDM03MT40-7?
For technical support, including SDM03MT40-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM03MT40-7 requirements.
6.How does Aetrix verify that SDM03MT40-7 is sourced from the original manufacturer or authorized distributors?
All SDM03MT40-7 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 SDM03MT40-7 meets industry standards.
7.What is the process for return or replacement of SDM03MT40-7?
All SDM03MT40-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM03MT40-7, 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 SDM03MT40-7 part is unused and in its original packaging.
Return procedure for SDM03MT40-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM03MT40-7 Tags
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BAV99-7-F
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