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Diodes Incorporated T12S5-7
- Part No.:
- T12S5-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
T12S5-7.pdf
- Description:
- TVS DIODE 12VWM 28VC SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:5,731
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Product details
Overview
T12S5 from Diodes Incorporated is a unidirectional surface-mount transient voltage suppression (TVS) diode designed for ESD and surge protection in low-capacitance signal lines. It features a 12 V reverse standoff voltage, 14.1 V minimum breakdown voltage at 1 mA, 20 V typical clamping voltage at 5 A (8/20 µs), 60 pF capacitance at 0 V and 1 MHz, and 300 mW power dissipation - deployed in USB, HDMI, and I²C interfaces to safeguard high-speed data lines.
For engineers reviewing the T12S5 datasheet, T12S5 pinout, T12S5 application, or T12S5 equivalent, key selection criteria include clamping performance under 5 A surge, sub-100 pF signal-line capacitance, SOD523 footprint compatibility, and compliance with IEC61000-4-2 ±30 kV contact/air discharge requirements.
Technical Context
This TVS diode operates in unidirectional configuration with cathode-band polarity, enabling robust clamping of positive transients while blocking reverse leakage below 0.01 µA at 12 V. Its silicon avalanche structure delivers fast response time (<1 ns) and stable breakdown behavior across -65°C to +150°C operating range.
The device is optimized for board-level ESD protection on high-speed digital interfaces where low capacitance and precise voltage thresholds are critical. Thermal resistance of 417°C/W (junction-to-ambient, FR-4 board) supports reliable operation under repetitive pulse conditions per Figure 1's 8×20 µs waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage | 12 V - Maximum continuous working voltage before clamping begins; sets upper limit for protected line DC bias. |
| Breakdown Voltage (Min) | 14.1 V @ 1 mA - Confirmed avalanche onset threshold; ensures reliable triggering above normal operating voltage. |
| Clamping Voltage (Typ) | 20 V @ 5 A, 8×20 µs - Peak voltage seen by downstream circuit during standardized surge; defines protection margin. |
| Total Capacitance | 60 pF @ 0 V, 1 MHz - Low enough to avoid signal integrity degradation on USB 2.0 or I²C buses. |
| ESD Rating (IEC61000-4-2) | ±30 kV air/contact - Meets industrial-grade ESD immunity requirements without external shielding. |
| Power Dissipation | 300 mW - Sustained thermal capability on standard FR-4 layout; enables use in space-constrained designs. |
| Operating Temperature | -65°C to +150°C - Validated performance across automotive under-hood and industrial control environments. |
Pinout & Package
Package: SOD523 - ultra-compact surface-mount plastic package (1.25 mm × 0.85 mm × 0.65 mm), halogen- and antimony-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Signal Line Input (Protected Side) | Connected to vulnerable I/O trace; conducts surge current to cathode during overvoltage event. |
| Cathode | Ground Reference / Clamp Return | Connected to local ground plane; establishes reference for clamping action and defines unidirectional polarity. |
| Cathode Band | Polarity Indicator | Visible marking on package top surface; essential for correct orientation during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low capacitance | 60 pF - Preserves signal rise/fall times on 480 Mbps USB 2.0 and multi-Mbps I²C links. |
| High ESD immunity | ±30 kV IEC61000-4-2 - Eliminates need for secondary ESD stages in consumer and industrial end equipment. |
| Precision clamping | 20 V typical VC @ 5 A - Tight voltage margin between standoff (12 V) and clamp ensures safe operation of 3.3 V/5 V logic interfaces. |
| Lead-free & green construction | Halogen- and antimony-free molding compound - Complies with IPC-1752A material declaration and EU environmental directives. |
Applications
| USB 2.0 Data Lines | HDMI DDC Channel |
|---|---|
Use Scenario: Protecting differential USB 2.0 D+ and D− lines from ESD events during cable insertion or handling. IC Role / Device Role: Unidirectional TVS placed between each data line and ground to clamp positive transients only. Use Value: 60 pF capacitance avoids eye diagram distortion; 20 V clamping prevents damage to USB transceivers rated for ≤3.6 V absolute maximum. | Use Scenario: Safeguarding HDMI Display Data Channel (DDC) pins (SCL/SDA) against electrostatic discharge during hot-plug events. IC Role / Device Role: Dual-channel TVS implementation using two T12S5 devices - one per DDC line - referenced to system ground. Use Value: 12 V standoff matches 5 V DDC supply; ±30 kV ESD rating exceeds HDMI Compliance Test Plan v1.4a requirements. |
| I²C Sensor Interface | Industrial CAN FD Transceiver I/O |
Use Scenario: Shielding low-speed I²C bus (3.3 V or 5 V) connecting microcontrollers to temperature, humidity, or motion sensors. IC Role / Device Role: Point-of-use TVS on SDA/SCL lines, placed adjacent to sensor connector to minimize inductance. Use Value: Sub-100 pF loading maintains timing margins for 400 kHz Fast-mode I²C; 0.01 µA leakage preserves bus pull-up efficiency. | Use Scenario: Secondary protection for CAN FD physical layer transceivers (e.g., TCAN1042) on data lines exposed to industrial EMI and coupling events. IC Role / Device Role: Pre-transceiver TVS stage limiting surge amplitude before it reaches the transceiver's internal protection network. Use Value: 14.1 V breakdown ensures conduction before transceiver's 16 V abs max rating is exceeded; SOD523 footprint fits tight PCB layouts near connectors. |
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 | DO-214AC package (larger), 12 V standoff, 19.9 V clamping @ 5 A, 100 pF | Higher capacitance limits use on >10 Mbps interfaces; better suited for power rail or lower-speed analog lines | Select when board space allows larger footprint and higher surge energy handling (400 W) is required. |
| SP1003-010 | SOD-323 package, 12 V standoff, 23 V clamping @ 5 A, 30 pF | Lower capacitance ideal for USB 3.0/PCIe Gen1; higher clamping voltage reduces protection margin for 3.3 V logic | Prefer for ultra-high-speed interfaces where <35 pF is mandatory, accepting elevated clamping risk for sensitive 1.8 V receivers. |
Compared with SMAJ12A and SP1003-010, T12S5 uniquely balances 60 pF capacitance, 20 V clamping, and SOD523 size - making it optimal for space-constrained, medium-speed digital interfaces requiring precise voltage coordination and certified ESD robustness.
Availability
T12S5 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC safeguarding, and industrial I²C sensor node designs requiring stable component supply and long-term obsolescence mitigation support.
Supply support for T12S5 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, signal integrity, and power management solutions for industrial, computing, and consumer markets.
The T12S5 belongs to Diodes' S-Series TVS portfolio, engineered specifically for compact, low-capacitance ESD protection in high-density portable and embedded systems with stringent EMC and footprint constraints.
FAQ
Is T12S5 still in active production?
No - T12S5 is officially obsolete and discontinued per Diodes Incorporated's DS31112 Rev. 14-2 (December 2021). Aetrix Electronics maintains limited legacy stock and supports design-in continuity through cross-reference guidance and qualified alternatives with validated performance equivalence.
What is the correct orientation for mounting T12S5 on PCB?
T12S5 must be mounted with the cathode band aligned toward the ground reference net. The band marks the cathode terminal; incorrect orientation will prevent clamping of positive transients and may cause catastrophic failure under surge conditions.
Can T12S5 be used for bidirectional signal lines like RS-485?
No - T12S5 is unidirectional and only clamps positive transients relative to ground. For bidirectional lines such as RS-485, a symmetric (bidirectional) TVS like SMBJ12CA or P6SMB12CA is required to protect both polarities of differential surges.
Does T12S5 meet automotive AEC-Q200 stress testing requirements?
No - T12S5 is not AEC-Q200 qualified. While its operating temperature range (-65°C to +150°C) overlaps with Grade 2 automotive specs, Diodes does not list it in their AEC-Q200-certified portfolio. For automotive applications, consider AEC-Q200-qualified alternatives such as D3V3F4U.
T12S5-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-79, SOD-523
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 14.1V
- Voltage - Clamping (Max) @ Ipp:
- 28V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 60pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
T12S5-7 FAQ
1.How can I place an order for T12S5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for T12S5-7 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 T12S5-7 reliable?
The price and inventory of T12S5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T12S5-7 is usually 5 days.
3.What payment methods are accepted for T12S5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T12S5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T12S5-7?
T12S5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T12S5-7 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 T12S5-7?
For technical support, including T12S5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T12S5-7 requirements.
6.How does Aetrix verify that T12S5-7 is sourced from the original manufacturer or authorized distributors?
All T12S5-7 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 T12S5-7 meets industry standards.
7.What is the process for return or replacement of T12S5-7?
All T12S5-7 units undergo pre-shipment inspection (PSI). If there is an issue with T12S5-7, 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 T12S5-7 part is unused and in its original packaging.
Return procedure for T12S5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T12S5-7 Tags
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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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Diodes Incorporated
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Diodes Incorporated
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