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onsemi SD12T1
- Part No.:
- SD12T1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD12T1.pdf
- Description:
- TVS DIODE 12VWM 19VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,205
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Product details
Overview
SD12T1 from onsemi is a unidirectional ESD protection diode in SOD-323 package, rated for 12 V working peak reverse voltage (VRWM), 19 V clamping voltage at 5 A (VC), and 350 W peak pulse power (8/20 µs). It meets IEC61000-4-2 Level 4 (±15 kV air, ±8 kV contact), IEC61000-4-4 Level 4 (40 A), and 30 kV HBM ESD. It is used to protect USB 2.0 data lines in portable medical monitors.
For engineers reviewing the SD12T1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 5 A surge, low 150 pF capacitance at 0 V bias, compliance with IEC61000-4-2/4-4/4-5, thermal resistance of 416 °C/W, and SOD-323 footprint compatibility with space-constrained PCB layouts.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient suppressor, triggering when reverse voltage exceeds its 13.3–15.75 V breakdown range (VBR) to clamp transients to ≤19 V at 5 A. Its low 1.0 µA max reverse leakage at 12 V ensures minimal signal loading on high-impedance interfaces.
Designed for board-level ESD immunity, it delivers 350 W peak pulse handling per IEC 61000-4-2 waveform (8/20 µs), with derating above 25 °C at 2.4 mW/°C and junction temperature range from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; sets safe operating margin for 12 V nominal bus lines. |
| VBR (min/max) | 13.3 V / 15.75 V - Breakdown initiates within this range at 1 mA test current; defines turn-on threshold consistency. |
| VC @ IPP = 5 A | 19 V - Clamped voltage during 5 A transient; determines maximum stress imposed on protected IC inputs. |
| Capacitance @ 0 V | 150 pF - Signal-line loading at DC bias; suitable for <12 Mbps data rates like USB 2.0 full-speed. |
| Peak Pulse Power | 350 W - Withstands 8/20 µs surges up to this energy level; validated per IEC61000-4-2 Level 4. |
| RJA | 416 °C/W - Thermal resistance from junction to ambient on FR-4; informs derating for sustained power dissipation. |
| HBM ESD Rating | 30 kV - Human Body Model withstand capability; exceeds JEDEC JS-001 Class C3 (8 kV) by wide margin. |
Pinout & Package
SOD-323 surface-mount package (1.70 × 1.25 × 0.85 mm), void-free thermosetting plastic case, matte tin lead finish, MSL 1, 260 °C reflow compatible. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to system ground or low-impedance return path; carries surge current during clamping event. |
| 2 (Non-banded End) | Anode | Connected to protected signal line (e.g., USB D+); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 Level 4 Compliance | Validated for ±15 kV air and ±8 kV contact discharge - enables pass-fail certification without external filtering. |
| Low Capacitance (150 pF) | Minimizes signal distortion on high-speed digital lines such as USB 2.0 and RS-485, preserving edge integrity. |
| Unidirectional Configuration | Protects only against negative transients on positive-rail signals - avoids forward conduction during normal operation. |
| Pb-Free & RoHS Compliant | Meets global environmental regulations; matte Sn finish ensures reliable solderability and intermetallic formation control. |
Applications
| USB 2.0 Interface Protection | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting D+ and D− lines of USB 2.0 ports in handheld diagnostic devices exposed to frequent ESD events in clinical environments. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly at connector entry point, clamping fast-rising ESD pulses before they reach USB transceiver IC. Use Value: 150 pF capacitance avoids signal degradation at 480 Mbps; 19 V clamping prevents damage to transceiver's 3.3 V I/O cells. | Use Scenario: Safeguarding analog output lines (4–20 mA) from ESD in factory-floor pressure sensors mounted on metal enclosures. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, absorbing contact-discharge transients coupled via cable shield or chassis coupling. Use Value: 12 V VRWM matches common sensor supply rails; 350 W peak power handles multiple repetitive discharges without degradation. |
| Medical Patient Monitor Front Panel | Point-of-Sale Terminal Keypad Traces |
Use Scenario: ESD protection for touchscreen controller I²C lines on bedside patient monitors subjected to nurse glove contact. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) shunt diode on SDA/SCL lines, maintaining bus pull-up integrity while suppressing ±8 kV contact ESD. Use Value: 1.0 µA IR at 12 V prevents false logic states; 30 kV HBM rating exceeds IEC61000-4-2 requirements for Class II medical equipment. | Use Scenario: Protecting membrane keypad scan traces in retail POS terminals located near static-prone carpeted floors. IC Role / Device Role / Timing Role: Discrete TVS placed inline between microcontroller GPIO and keypad matrix, triggered only during ESD events. Use Value: SOD-323 footprint allows placement directly under keypad flex connector; 19 V VC limits voltage seen by 5 V tolerant MCU pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD5Z12 | Same SOD-323 package; 12 V VRWM; 23 V VC @ 5 A; 170 pF capacitance. | Higher clamping voltage increases risk to 3.3 V ICs; higher capacitance reduces usable data rate. | Acceptable where 23 V clamping is tolerable and signal bandwidth < 10 Mbps. |
| TPD2E007DRYR | Dual-channel SOT-563; 12 V VRWM; 14 V VC @ 1 A; 10 pF per channel. | Lower capacitance enables USB 3.0 support; dual configuration saves board area for differential pairs. | Preferred for new designs requiring lower capacitance or dual-line protection in same footprint. |
Compared with ESD5Z12, SD12T1 offers tighter clamping (19 V vs. 23 V) critical for 3.3 V interfaces; compared with TPD2E007DRYR, SD12T1 provides higher single-line surge rating (350 W vs. 120 W) but lacks dual-channel integration and has higher capacitance.
Availability
SD12T1 is available at Aetrix Electronics and suitable for USB interface protection, industrial sensor signal conditioning, and medical device front-panel I/O requiring stable component supply and long-term lifecycle support.
Supply support for SD12T1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and medical applications.
The SD12T1 belongs to the SDxxT1 series of unidirectional ESD protection diodes, engineered specifically for compact, high-reliability transient suppression in space-constrained consumer and medical electronics.
FAQ
What is the clamping voltage of the SD12T1 at 5 A surge current?
The SD12T1 clamps to a maximum of 19 V when subjected to a 5 A, 8/20 µs transient pulse. This value is measured under standardized IEC61000-4-2 test conditions and ensures downstream 3.3 V or 5 V ICs remain within safe operating voltage limits during ESD events. The SD12T1 maintains this performance across its specified junction temperature range of −55 °C to +150 °C.
Is the SD12T1 suitable for protecting USB 2.0 data lines?
Yes, the SD12T1 is suitable for USB 2.0 data line protection due to its 150 pF capacitance at 0 V bias, which preserves signal integrity at full-speed (12 Mbps) and high-speed (480 Mbps) rates. Its 19 V clamping voltage and 12 V VRWM align with USB transceiver I/O voltage ratings, and its SOD-323 footprint enables direct placement at the connector. The SD12T1 also meets IEC61000-4-2 Level 4, making it appropriate for end-equipment ESD certification.
Does the SD12T1 meet automotive qualification standards?
No, the SD12T1 is not AEC-Q101 qualified. The automotive-grade variant is the SZSD12T1G, which carries the "SZ" prefix and is explicitly marked as PPAP-capable and AEC-Q101 qualified in the onsemi datasheet. The SD12T1 is intended for commercial and industrial applications; using it in automotive systems requires separate validation and may not satisfy OEM reliability requirements. Always verify qualification status via the official SD12T1G datasheet.
What is the thermal resistance (RJA) of the SD12T1 on a standard FR-4 board?
The SD12T1 has a junction-to-ambient thermal resistance (RJA) of 416 °C/W when mounted on a single-sided FR-4 PCB with a 1 cm² copper pad. This value governs power derating above 25 °C ambient - decreasing linearly at 2.4 mW/°C. For sustained operation near its 300 mW steady-state power limit, board layout must ensure adequate copper area and airflow, as RJA can increase significantly with smaller pads or no thermal vias.
How does the SD12T1 differ from the SD05T1 in terms of electrical performance?
The SD12T1 differs from the SD05T1 primarily in its 12 V VRWM (vs. 5 V), higher 13.3–15.75 V breakdown range (vs. 6.2–7.3 V), and 19 V clamping voltage at 5 A (vs. 9.8 V). Its capacitance is 150 pF (vs. 350 pF), making it better suited for higher-speed interfaces. Both share identical SOD-323 packaging, 350 W peak power rating, and IEC61000-4-2/4-4 compliance, but the SD12T1 targets 12 V rail protection while SD05T1 serves 5 V or 3.3 V domains.
SD12T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-76, SOD-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- 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
SD12T1 FAQ
1.How can I place an order for SD12T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SD12T1 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 SD12T1 reliable?
The price and inventory of SD12T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD12T1 is usually 5 days.
3.What payment methods are accepted for SD12T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD12T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD12T1?
SD12T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD12T1 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 SD12T1?
For technical support, including SD12T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD12T1 requirements.
6.How does Aetrix verify that SD12T1 is sourced from the original manufacturer or authorized distributors?
All SD12T1 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 SD12T1 meets industry standards.
7.What is the process for return or replacement of SD12T1?
All SD12T1 units undergo pre-shipment inspection (PSI). If there is an issue with SD12T1, 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 SD12T1 part is unused and in its original packaging.
Return procedure for SD12T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD12T1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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