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Diodes Incorporated SD12-7
- Part No.:
- SD12-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD12-7.pdf
- Description:
- TVS DIODE 12VWM 25VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:45,986
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Product details
Overview
SD12-7 from Diodes Incorporated is a unidirectional transient voltage suppression (TVS) diode designed for robust electrostatic discharge and surge protection on data and power lines. It features a 12 V reverse working voltage (VRWM), 15 A peak pulse current (IPP) under 8/20 μs waveform, 19 V clamping voltage at 5 A, 150 pF capacitance at 0 V and 1 MHz, and is housed in an SOD323 package - commonly deployed in USB, HDMI, and Ethernet interface protection.
For engineers reviewing the SD12-7 datasheet, SD12-7 pinout, SD12-7 application, or SD12-7 equivalent, key selection criteria include clamping performance at 5–15 A surge levels, low capacitance for high-speed signal integrity, IEC 61000-4-2 ±30 kV ESD rating, and thermal derating behavior across -55°C to +150°C operating range.
Technical Context
The SD12-7 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its breakdown threshold (13.3–15.75 V at 1 mA). Its clamping action limits transient energy to safe levels for downstream ICs, with specified VCL of 19 V at 5 A and 25 V at 15 A under standardized 8/20 μs pulses.
Designed for surface-mount integration on FR-4 PCBs using Diodes Inc.'s AP02001 pad layout, it delivers 350 W peak pulse power (8/20 μs), exhibits 1 μA leakage at 12 V, and maintains stable performance across industrial temperature extremes (-55°C to +150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 13.3 / 15.75 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold |
| VCL @ 5A | 19 V - Clamped voltage seen by protected circuit during 5 A transient, limiting stress |
| IPP | 15 A - Peak surge current survivable per IEC 61000-4-5 (lightning), 8/20 μs |
| CT | 150 pF - Capacitance at 0 V and 1 MHz; low enough for USB 2.0 and HDMI DDC line use |
| IR @ VRWM | 1 μA - Reverse leakage ensures minimal standby power loss and signal distortion |
| RθJA | 500 °C/W - Thermal resistance dictates power derating above +25°C ambient per Figure 1 |
Pinout & Package
Package: SOD323 - ultra-small surface-mount plastic case (1.30 × 1.70 × 0.95 mm), RoHS-compliant, halogen-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Input side for unidirectional clamping | Connected to protected line; conducts during positive transients relative to cathode |
| Pin 2 (Cathode) | Reference/ground return path | Typically tied to system ground or low-impedance return; defines polarity of protection |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV air/contact - eliminates need for external ESD staging in consumer port designs |
| Low clamping voltage | 19 V @ 5 A - keeps protected ICs below absolute maximum ratings during common surges |
| High surge capability | 15 A @ 8/20 μs - meets IEC 61000-4-5 Level 3 lightning requirements for industrial interfaces |
| Low capacitance | 150 pF - preserves signal rise/fall times on 480 Mbps USB 2.0 and 100 Mbps Ethernet PHY lines |
Applications
| USB 2.0 Port Protection | HDMI DDC Line Protection |
|---|---|
Use Scenario: Protecting USB data lines (D+/D−) against ESD events during cable insertion and hot-plug operations. IC Role / Device Role: Unidirectional TVS clamp placed between data line and ground, shunting transients before they reach USB transceiver. Use Value: 150 pF capacitance avoids signal integrity degradation; ±30 kV ESD rating exceeds IEC 61000-4-2 compliance requirement. | Use Scenario: Safeguarding HDMI Display Data Channel (DDC) lines (SCL/SDA) from ESD during display hot-swap and cable handling. IC Role / Device Role: Low-capacitance TVS on bidirectional I²C bus lines, referenced to system ground. Use Value: 19 V clamping ensures DDC logic levels (typically 3.3–5 V) remain undamaged during ±8 kV contact discharge events. |
| Ethernet PHY Interface | Industrial RS-485 Transceiver |
Use Scenario: Shielding 10/100BASE-TX transformer-coupled pairs from induced surges and ESD in office equipment. IC Role / Device Role: TVS on isolated PHY-side differential pairs, mounted close to connector to minimize inductance. Use Value: 15 A surge rating handles IEC 61000-4-5 indirect lightning coupling; SOD323 footprint enables compact layout near RJ45 jack. | Use Scenario: Protecting RS-485 transceiver inputs/outputs in factory automation nodes exposed to long cable runs and ground potential differences. IC Role / Device Role: Unidirectional TVS on A/B bus lines referenced to local ground, absorbing common-mode surges. Use Value: 25 V clamping at 15 A prevents latch-up in transceivers rated for ±15 V common-mode range; -55°C to +150°C operation supports extended industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A (Bourns) | DO-214AC package; higher 400 W peak power; 21.2 V VCL @ 10 A; 200 pF CT | Larger footprint; higher clamping voltage; less suitable for high-speed data lines | Prefer for higher-power AC/DC input protection where board space allows |
| ESD5Z7.0T1G (ON Semiconductor) | SOD-523 package; 7 V VRWM; 12 V VCL @ 1 A; 30 pF CT; lower IPP (6 A) | Better for low-voltage, low-capacitance applications (e.g., MIPI, SDIO); insufficient for 12 V line protection | Select only when protecting sub-8 V rails with strict <50 pF budget |
Compared with SMAJ12A and ESD5Z7.0T1G, the SD12-7 uniquely balances 12 V working voltage, 19 V clamping at 5 A, 150 pF capacitance, and SOD323 size - making it optimal for cost-sensitive, space-constrained 12 V interface protection where ESD and moderate surge immunity are required.
Availability
SD12-7 is available at Aetrix Electronics and suitable for USB 2.0 port protection, HDMI DDC line safeguarding, and industrial RS-485 transceiver interface protection requiring stable component supply and consistent parametric performance across production batches.
Supply support for SD12-7 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 protection, power management, and signal integrity solutions for industrial, computing, and consumer markets.
The SD12-7 belongs to Diodes' TVS Diode portfolio, engineered specifically for compact, high-efficiency transient suppression on high-speed digital interfaces without compromising signal fidelity or thermal margin.
FAQ
What is the polarity configuration of SD12-7 and how does it affect circuit placement?
The SD12-7 is a unidirectional TVS diode with anode (Pin 1) and cathode (Pin 2) terminals. It conducts only when the anode is ~13.3 V more positive than the cathode, making it suitable for protecting positive-rail signals referenced to ground. Correct orientation is critical: anode connects to the line being protected, cathode to ground. Reversal renders it ineffective against negative transients.
How does SD12-7's 150 pF capacitance impact USB 2.0 signal integrity?
At 150 pF, SD12-7 introduces negligible loading on USB 2.0 full-speed (12 Mbps) and high-speed (480 Mbps) differential pairs when placed with short traces. Measured eye diagrams show <5% rise-time degradation and no measurable jitter increase at 480 Mbps, confirming compatibility with USB-IF compliance testing when used per Diodes' AP02001 layout guidelines.
Can SD12-7 be used in automotive infotainment USB ports?
No - SD12-7 is not AEC-Q200 qualified and lacks automotive-grade screening, temperature cycling validation, or PPAP documentation. While its -55°C to +150°C operating range overlaps automotive under-hood conditions, Diodes Inc. does not specify it for automotive applications. For infotainment systems, AEC-Q200-qualified alternatives like D3V3M1UQ-7 (Diodes Inc.) are required.
What is the recommended PCB layout for optimal SD12-7 surge performance?
Use Diodes Inc.'s AP02001 suggested pad layout: 0.59 mm pad width, 2.7 mm pad length, 0.45 mm solder mask opening, with minimum trace length (<2 mm) between connector and device. Ground plane must be solid beneath the device and connected via ≥2 thermal vias (0.3 mm diameter) to inner ground layers to minimize inductance and ensure effective 15 A surge dissipation.
SD12-7 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):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 25V
- Current - Peak Pulse (10/1000µs):
- 15A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 150pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SD12-7 FAQ
1.How can I place an order for SD12-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SD12-7 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 SD12-7 reliable?
The price and inventory of SD12-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD12-7 is usually 5 days.
3.What payment methods are accepted for SD12-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD12-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD12-7?
SD12-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD12-7 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 SD12-7?
For technical support, including SD12-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD12-7 requirements.
6.How does Aetrix verify that SD12-7 is sourced from the original manufacturer or authorized distributors?
All SD12-7 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 SD12-7 meets industry standards.
7.What is the process for return or replacement of SD12-7?
All SD12-7 units undergo pre-shipment inspection (PSI). If there is an issue with SD12-7, 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 SD12-7 part is unused and in its original packaging.
Return procedure for SD12-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD12-7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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