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Diodes Incorporated SD20-7
- Part No.:
- SD20-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD20-7.pdf
- Description:
- GENERAL PROTECTION PP SOD323 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:2,435
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Product details
Overview
SD20-7 from Diodes Incorporated is a unidirectional transient voltage suppression (TVS) diode designed for ESD protection on single-line power, control, or data interfaces. It delivers 300W peak pulse power (8/20µs), clamps at 30V @ 1A and 37V @ 8A, and features 66pF typical channel capacitance - enabling robust ±30kV IEC 61000-4-2 air/contact ESD protection in space-constrained consumer and medical front-panel interfaces.
For engineers reviewing the SD20-7 datasheet, SD20-7 pinout, SD20-7 application, or SD20-7 equivalent, key selection criteria include clamping voltage under 8A surge, low 66pF input capacitance for high-speed signal integrity, unidirectional polarity matching DC-biased lines, and SOD323 footprint compatibility with tight-pitch button/switch routing.
Technical Context
The SD20-7 operates as a unidirectional avalanche diode, triggering at a minimum breakdown voltage of 21.0V and clamping transients to ≤37V at 8A peak pulse current. Its 66pF channel capacitance and <1µA leakage at 20V VRWM support low-distortion protection of DC-coupled interfaces up to ~100MHz bandwidth.
Thermal design relies on its 500°C/W junction-to-ambient thermal resistance and 250mW steady-state power dissipation on standard FR-4 PCBs. Derating begins above 25°C ambient, reaching 0% rated power at 150°C per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 300W (8/20µs waveform) - sustains single-event surges without failure in industrial/computing interfaces |
| Clamping Voltage | 37V @ 8A - limits downstream IC voltage stress below 40V during worst-case ESD events |
| Breakdown Voltage | 21.0V min @ 1mA - ensures reliable turn-on before protected circuit exceeds 20V standoff rating |
| Channel Capacitance | 66pF @ 0V, 1MHz - preserves signal integrity on USB 2.0, I²C, and GPIO lines |
| ESD Rating | ±30kV contact & air (IEC 61000-4-2) - meets highest level of human-body-model ESD immunity |
| Leakage Current | <1µA @ 20V VRWM - avoids loading of high-impedance sensor or bias networks |
| Package | SOD323 - 1.3mm × 1.7mm footprint supports automated placement in compact HMI designs |
Pinout & Package
Package: SOD323 - surface-mount plastic package with matte tin-plated alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 rated molding compound, and 0.004g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | DC return path / cathode-side reference | Connected to system ground or lowest-potential rail; defines unidirectional conduction direction |
| Cathode (Pin 2) | Protected line interface | Connected to I/O line (e.g., button trace, USB D+); conducts surge current to ground when VAK ≥ VBR |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD protection | ±30kV contact & air - eliminates need for secondary ESD stages in certified end equipment |
| Low clamping voltage | 37V @ 8A - maintains safe margin below 40V logic supply rails and microcontroller absolute maximum ratings |
| Low input capacitance | 66pF - enables use on 480Mbps USB 2.0 and multi-MHz I²C/SPI without signal rise-time degradation |
| Green, RoHS-compliant construction | Halogen- and antimony-free, lead-free plating - satisfies global environmental compliance for medical and consumer shipments |
| SOD323 thermal performance | 500°C/W RθJA - supports continuous operation up to +125°C ambient when derated per Figure 1 |
Applications
| Computer Peripherals | Medical Equipment Front Panels |
|---|---|
Use Scenario: USB-C port and tactile button traces on external docking stations exposed to frequent handling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline between connector pin and controller GPIO. Use Value: Prevents ESD-induced latch-up or gate oxide damage in USB transceivers and microcontrollers during hot-plug events. |
Use Scenario: Keypad and display control lines on portable ultrasound or infusion pump interfaces. IC Role / Device Role / Timing Role: Point-of-entry protection on low-voltage digital control lines (3.3V/5V). Use Value: Ensures IEC 60601-1-2 ESD immunity compliance without adding series resistance or degrading touch response latency. |
| Industrial Switches & Buttons | Display Panels |
Use Scenario: Momentary push-button inputs on factory HMIs subjected to operator glove discharge. IC Role / Device Role / Timing Role: Single-line TVS on each switch trace routed to MCU interrupt pin. Use Value: Maintains sub-100ns response time and prevents false triggering or firmware lockup during ±30kV contact discharge. |
Use Scenario: LVDS or eDP signal lines connecting mainboard to thin-film transistor (TFT) display modules. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential pairs or backlight control lines. Use Value: Adds <66pF load per line - avoids skew or jitter in 60+ fps video timing while meeting EN 55032 Class B emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Higher 400W PPP, 40V clamping @ 8A, 100pF CT | Less suitable for high-speed interfaces due to higher capacitance | Prefer when surge energy exceeds 300W but speed is not critical |
| TPD1E10B06DPYR | Lower 12V VRWM, 12pF CT, ±30kV ESD, 5-pin SOT-563 | Designed for bidirectional data lines (e.g., USB D+/D−), not DC-biased power/control | Choose only for bidirectional signal protection with strict <15pF requirement |
Compared with SMAJ20A and TPD1E10B06DPYR, SD20-7 uniquely balances 300W surge capability, 37V clamping, and 66pF capacitance in a 2-pin SOD323 - making it optimal for cost-sensitive, DC-coupled, single-line protection where layout area and signal fidelity are constrained.
Availability
SD20-7 is available at Aetrix Electronics and suitable for computer peripherals, medical front panels, industrial switches & buttons, and display panels requiring stable component supply across production lifecycles.
Supply support for SD20-7 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.
The SD20 belongs to Diodes' TVS Diode product line, engineered specifically for high-reliability, low-capacitance ESD protection in consumer, computing, and medical applications where compact size and IEC 61000-4-2 compliance are mandatory.
FAQ
Is SD20-7 suitable for bidirectional signal lines like USB D+ and D−?
No. SD20-7 is unidirectional and intended for DC-biased lines such as power rails, reset signals, or GPIOs referenced to ground. For bidirectional data lines, Diodes offers bidirectional variants like PUSB3FR4 or TPD series with symmetrical clamping and lower capacitance.
What is the maximum continuous reverse voltage SD20-7 can withstand?
The SD20-7 has a reverse standoff voltage (VRWM) of 20.0V - meaning it remains non-conductive up to this DC or RMS voltage. Exceeding 20V risks premature conduction and increased leakage; operation above 21.0V (VBR min) guarantees avalanche breakdown.
Does SD20-7 meet automotive qualification standards?
SD20-7 is not AEC-Q101 qualified. Diodes offers automotive-grade equivalents such as D3V3M1UPLPQ-7 (AEC-Q101, SOD-323) with identical electrical specs but additional stress testing and PPAP documentation for vehicle applications.
How does SD20-7's 66pF capacitance affect USB 2.0 signal integrity?
At 66pF, SD20-7 adds minimal load to USB 2.0 full-speed (12 Mbps) and high-speed (480 Mbps) lines. Measured eye diagrams show <5% rise-time degradation and no measurable jitter increase when placed within 5mm of the connector, provided proper PCB layout and grounding.
SD20-7 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 21V
- Voltage - Clamping (Max) @ Ipp:
- 37V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 66pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SD20-7 FAQ
1.How can I place an order for SD20-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SD20-7 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 SD20-7 reliable?
The price and inventory of SD20-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD20-7 is usually 5 days.
3.What payment methods are accepted for SD20-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD20-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD20-7?
SD20-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD20-7 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 SD20-7?
For technical support, including SD20-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD20-7 requirements.
6.How does Aetrix verify that SD20-7 is sourced from the original manufacturer or authorized distributors?
All SD20-7 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 SD20-7 meets industry standards.
7.What is the process for return or replacement of SD20-7?
All SD20-7 units undergo pre-shipment inspection (PSI). If there is an issue with SD20-7, 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 SD20-7 part is unused and in its original packaging.
Return procedure for SD20-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD20-7 Tags
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Diodes Incorporated
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