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Diodes Incorporated SD20C-7
- Part No.:
- SD20C-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD20C-7.pdf
- Description:
- TVS DIODE 20VWM 37VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
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Product details
Overview
SD20C-7 from Diodes Incorporated is a bidirectional transient voltage suppression (TVS) diode designed for ESD protection of high-speed data lines in portable electronics. It features a 21V minimum breakdown voltage, 370W peak pulse power rating (8/20µs), 31pF typical channel capacitance, ±30kV IEC 61000-4-2 contact/air ESD immunity, and SOD323 package - enabling robust protection without signal integrity degradation in USB, audio, or camera interfaces.
For engineers reviewing the SD20C-7 datasheet, SD20C-7 pinout, SD20C-7 application, or SD20C-7 equivalent, key selection criteria include clamping voltage at 10A (37V), low leakage (<1µA at 20V), thermal resistance (500°C/W), RoHS/Green compliance, and suitability for space-constrained PCB layouts requiring sub-1mm footprint devices.
Technical Context
This TVS diode operates in bidirectional avalanche mode to clamp both positive and negative transients, with a reverse standoff voltage of 20.0V and breakdown triggered at 21.0V (IR = 1mA). Its ultra-low 31pF junction capacitance minimizes signal distortion on high-frequency lines such as USB 2.0 or MIPI D-PHY.
The device sustains 10A peak pulse current under 8/20µs waveform while limiting voltage to 37V, delivering 370W surge handling capability. Thermal performance is defined for FR-4 board mounting (2oz copper), with 250mW steady-state power dissipation and 500°C/W junction-to-ambient resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 20.0V reverse standoff voltage - ensures no conduction during normal operation up to rated system voltage |
| VBR (min) | 21.0V at 1mA - precise threshold for reliable avalanche clamping onset |
| VCL @ 10A | 37V clamping voltage - limits transient voltage seen by protected IC under worst-case 8/20µs surge |
| CT (typ) | 31pF at 0V, 1MHz - preserves signal integrity on high-speed interfaces like USB or HDMI |
| ESD Rating | ±30kV contact & air per IEC 61000-4-2 - exceeds industrial and consumer ESD immunity requirements |
| Package | SOD323 - 1.3 × 1.7 × 0.9mm surface-mount outline compatible with automated placement and reflow |
| Power Dissipation | 250mW continuous - supports stable operation under ambient temperatures up to +150°C |
Pinout & Package
SD20C-7 uses the SOD323 plastic surface-mount package with two terminals: anode and cathode. The device is bidirectional, meaning either terminal may serve as input or return path depending on transient polarity. Marking "D/D(Reverse)" identifies orientation on tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative surge) | Accepts negative-going ESD events; forms one side of symmetrical clamping path |
| Cathode | Transient current entry (positive surge) | Accepts positive-going ESD events; completes bidirectional clamping circuit |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ESD protection | Clamps both polarities without external polarity configuration - simplifies layout and eliminates orientation errors |
| Ultra-low 31pF capacitance | Minimizes insertion loss and timing skew on 480Mbps USB 2.0 or 1Gbps MIPI lanes |
| ±30kV IEC 61000-4-2 rating | Meets highest level of system-level ESD immunity required for handheld consumer devices |
| SOD323 footprint | Enables placement adjacent to connectors or IC pins with minimal PCB area (≈2.2mm²) |
| Lead-free & Halogen-free | Complies with RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| USB 2.0 Data Lines | Digital Camera Interface |
|---|---|
Use Scenario: Protection of D+ and D− lines against ESD during cable insertion or user handling in smartphones and tablets. IC Role / Device Role: Bidirectional clamping element placed between connector and USB transceiver IC. Use Value: 31pF capacitance avoids signal rise-time degradation while maintaining 480Mbps data integrity. |
Use Scenario: Shielding MIPI CSI-2 differential pairs in mobile camera modules from contact discharge during assembly or field use. IC Role / Device Role: Localized TVS at FPC connector to suppress fast-rising ESD pulses before reaching image sensor ASIC. Use Value: 37V clamping at 10A prevents latch-up or gate oxide damage in 1.2V/1.8V sensor I/O cells. |
| Audio Jack ESD Protection | Portable Keyboard/Mouse USB Ports |
Use Scenario: Guarding 3.5mm TRRS audio jack contacts against repeated ±8kV human-body-model discharges. IC Role / Device Role: Low-capacitance shunt protector on left/right/mic/ground paths to preserve analog audio fidelity. Use Value: Sub-1µA leakage at 20V prevents DC bias shift in amplifier input stages. |
Use Scenario: Safeguarding upstream USB ports on compact peripherals against accidental ESD from user fingers or metal objects. IC Role / Device Role: Primary front-line protection before USB switch or hub controller. Use Value: 370W surge rating handles multiple 30kV events without parametric shift or failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Unidirectional; 20V VRWM; 400W PPP; 100pF CT | Requires polarity-aware layout; higher capacitance limits use to lower-speed lines | Select only if unidirectional protection suffices and board space allows larger SMA package |
| TPD2E001DRYR | 2-channel array; 15pF CT; ±8kV IEC 61000-4-2; 0.65mm × 0.65mm DRY | Lower ESD rating; optimized for ultra-dense routing but insufficient for ±30kV requirement | Use where board area is critical and system-level testing validates lower ESD margin |
Compared with SMAJ20A and TPD2E001DRYR, SD20C-7 uniquely balances ±30kV immunity, 31pF capacitance, and SOD323 size - making it optimal for portable USB/audio designs needing full IEC-compliant protection without sacrificing signal integrity.
Availability
SD20C-7 is available at Aetrix Electronics and suitable for cellular handsets, portable electronics, and computers and peripheral designs requiring stable component supply, consistent ESD performance across production lots, and long-term lifecycle support.
Supply support for SD20C-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, manufacturing, and sales operations across Asia, Europe, and North America.
SD20C-7 belongs to Diodes' TVS Diode product line, engineered specifically for high-density, low-capacitance ESD protection in battery-powered consumer electronics where board space and signal fidelity are constrained.
FAQ
What is the maximum clamping voltage of SD20C-7 at 10A surge current?
The SD20C-7 clamps to 37V when subjected to a 10A, 8/20µs transient pulse, as specified in its Electrical Characteristics table. This value is measured cathode-to-anode under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Is SD20C-7 suitable for protecting USB 3.0 or HDMI interfaces?
No - SD20C-7's 31pF capacitance exceeds recommended limits for USB 3.0 (typically <2pF) and HDMI (typically <0.5pF). It is validated for USB 2.0, audio, and MIPI CSI-2 interfaces where capacitance tolerance is higher and data rates are ≤480Mbps.
Does SD20C-7 require orientation-specific placement on PCB?
No - SD20C-7 is a bidirectional TVS diode, meaning its anode and cathode terminals are functionally symmetric for ESD clamping. Placement follows standard SOD323 orientation per marking ("D/D(Reverse)"), but polarity does not affect protection performance.
What is the moisture sensitivity level (MSL) of SD20C-7?
SD20C-7 has a Moisture Sensitivity Level of 1 per J-STD-020, indicating unlimited floor life at ≤30°C/60% RH and no bake requirement prior to reflow soldering - simplifying manufacturing handling and storage.
SD20C-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-76, SOD-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V (Max)
- Voltage - Breakdown (Min):
- 21V
- Voltage - Clamping (Max) @ Ipp:
- 37V
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- 370W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 31pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SD20C-7 FAQ
1.How can I place an order for SD20C-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SD20C-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 SD20C-7 reliable?
The price and inventory of SD20C-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD20C-7 is usually 5 days.
3.What payment methods are accepted for SD20C-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD20C-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD20C-7?
SD20C-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD20C-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 SD20C-7?
For technical support, including SD20C-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD20C-7 requirements.
6.How does Aetrix verify that SD20C-7 is sourced from the original manufacturer or authorized distributors?
All SD20C-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 SD20C-7 meets industry standards.
7.What is the process for return or replacement of SD20C-7?
All SD20C-7 units undergo pre-shipment inspection (PSI). If there is an issue with SD20C-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 SD20C-7 part is unused and in its original packaging.
Return procedure for SD20C-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD20C-7 Tags
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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