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onsemi SMS05T1
- Part No.:
- SMS05T1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SMS05T1.pdf
- Description:
- TVS DIODE 5VWM 15.5VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:4,271
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Product details
Overview
SMS05T1 from onsemi is a quad unidirectional ESD and surge protector in SC-74 package, rated for 5 V working voltage, 350 W peak pulse power (8 × 20 µs), 9.8 V clamping voltage at 23 A, and 25 kV HBM ESD rating - deployed to safeguard USB, HDMI, and audio I/O lines in portable electronics.
For engineers reviewing the SMS05T1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 23 A surge, sub-10 pF capacitance per channel, unidirectional configuration compatibility with 5 V rail protection, and AEC-Q101 qualification for automotive infotainment interfaces.
Technical Context
This device integrates four independent unidirectional TVS diodes in a single SC-74 (Case 318F) monolithic silicon structure, each configured as cathode-anode-cathode-anode-cathode-cathode per pinout. It operates exclusively in reverse-biased mode for transient suppression, with no forward conduction path required for protection function.
Designed for IEC 61000-4-2 (15 kV air / 8 kV contact), IEC 61000-4-4 (40 A EFT), and IEC 61000-4-5 (23 A surge, 8/20 µs), it delivers stable clamping below 10 V while maintaining <400 pF total capacitance across all channels at 0 V bias - critical for high-speed signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 350 W (8 × 20 µs waveform) - sustains single-event surge without failure in USB 2.0 or audio jack interfaces |
| Clamping Voltage | 9.8 V @ 23 A - limits downstream IC voltage stress below 10 V during IEC 61000-4-5 surge events |
| Working Peak Reverse Voltage | 5.0 V - matches standard 5 V logic and interface rails without leakage or false triggering |
| ESD Rating (HBM) | Class N (>25 kV) - exceeds JEDEC JS-001 Level 4 for handheld device button/keypad ESD robustness |
| Capacitance (per channel) | 250–400 pF @ 0 V, 1 MHz - low enough to avoid signal degradation on 480 Mbps USB 2.0 differential pairs |
| Package | SC-74 (Case 318F, 6-pin) - enables compact 2.1 mm × 2.0 mm PCB footprint for space-constrained mobile designs |
| AEC-Q101 Qualified | Yes - validated for automotive infotainment display ports and telematics module I/O protection |
Pinout & Package
SC-74 package (Case 318F, Style 1), surface-mount, Pb-free, RoHS-compliant, with 6 terminals in a single-row configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Common cathode connection for Channel 1; ties to protected signal line anode-side reference |
| 2 | Anode | Anode of Channel 1; connects to 5 V rail or ground depending on unidirectional biasing scheme |
| 3 | Cathode | Cathode of Channel 2; used for second I/O line (e.g., HDMI DDC clock) |
| 4 | Cathode | Cathode of Channel 3; supports third protected line (e.g., audio MIC input) |
| 5 | Anode | Anode of Channels 2 & 3; shared anode node simplifies PCB routing for multi-line protection |
| 6 | Cathode | Cathode of Channel 4; completes quad-channel set for full-port protection (e.g., USB ID/D+/D−) |
Key Features
| Feature | Design Value |
|---|---|
| Quad unidirectional topology | Enables independent protection of four 5 V signal lines without cross-talk or shared impedance paths |
| 350 W peak pulse rating | Withstands industrial-grade lightning-induced surges on external connectors without thermal runaway |
| Sub-10 V clamping at 23 A | Keeps protected ICs (e.g., USB transceivers) within absolute maximum ratings during IEC 61000-4-5 testing |
| 250–400 pF capacitance range | Maintains signal rise/fall time integrity on 480 Mbps USB 2.0 and 1080p HDMI TMDS lines |
| AEC-Q101 qualification | Validated for temperature cycling, humidity bias, and mechanical shock in automotive cabin environments |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+, D−, ID, and VBUS pins of mini/micro-USB connectors against ESD and cable discharge events in smartphones and tablets. IC Role / Device Role: Quad unidirectional TVS array providing rail-to-rail clamping on four distinct 5 V–compatible signal paths. Use Value: Prevents latch-up and gate oxide damage in USB PHY ICs by limiting transient voltage to ≤9.8 V at 23 A surge current. | Use Scenario: Safeguarding HDMI DDC, CEC, HPD, and +5 V supply pins against hot-plug transients and ESD in portable projectors and docking stations. IC Role / Device Role: Single-component solution for four low-capacitance, 5 V-compatible protection paths with matched clamping behavior. Use Value: Ensures HDMI compliance by holding capacitance ≤400 pF per channel to avoid TMDS signal integrity loss at 2.25 Gbps. |
| Automotive Infotainment Display | Industrial Handheld Terminal |
Use Scenario: Shielding LVDS or RGB interface lines and touch controller I²C bus from ESD in vehicle center-stack displays exposed to dry-climate user interaction. IC Role / Device Role: AEC-Q101 qualified quad TVS protecting four 5 V–referenced data/control lines with common-anode architecture. Use Value: Eliminates need for discrete TVS diodes per line, reducing BOM count and PCB area while meeting ISO 10605 ESD requirements. | Use Scenario: Securing keypad, touchscreen, and serial port (RS-232/485) I/O on warehouse barcode scanners subjected to repeated static discharge in low-humidity environments. IC Role / Device Role: High-energy (350 W) transient suppressor for four independent 5 V logic-level inputs with >25 kV HBM immunity. Use Value: Extends field service life by preventing cumulative ESD damage to microcontroller GPIOs and level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD and surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SP1006-04UTG | 4-channel unidirectional TVS; 5.5 V VRWM; 12.5 V VC @ 20 A; 0.5 pF/channel | Lower capacitance ideal for USB 3.0/PCIe; lower surge rating (150 W) | Prefer for high-speed differential interfaces where sub-1 pF/channel is mandatory |
| SMAJ5.0A | Single-channel unidirectional TVS; same 5.0 V VRWM; 9.2 V VC @ 22.5 A; SC-79 package | Requires four discrete devices; no integrated quad layout or shared anode optimization | Choose only when board space allows discrete placement and routing flexibility is needed |
Compared with SP1006-04UTG and SMAJ5.0A, SMS05T1 offers balanced performance: higher surge capacity than SP1006-04UTG and superior integration over SMAJ5.0A - making it optimal for cost- and space-sensitive 5 V interface protection where 350 W surge margin and AEC-Q101 compliance are required.
Availability
SMS05T1 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC line safeguarding, and automotive infotainment display I/O requiring stable component supply across production lifecycles.
Supply support for SMS05T1 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 technologies for automotive, industrial, cloud, and IoT applications.
The SMS05T1 belongs to the SMSxxT1 series of quad ESD/surge protectors, engineered specifically for compact, high-density I/O protection in portable and automotive electronics with stringent EMC and reliability requirements.
FAQ
What is the exact pin configuration of SMS05T1 and how does it map to protected signals?
The SMS05T1 uses SC-74 Style 1 pinout: Pin 1 (Cathode), Pin 2 (Anode), Pin 3 (Cathode), Pin 4 (Cathode), Pin 5 (Anode), Pin 6 (Cathode). This implements four unidirectional channels - Channels 1–4 share Pins 2 and 5 as common anodes, while cathodes are individually accessible. In practice, Pin 2 and Pin 5 connect to system ground or 5 V rail depending on polarity, and each cathode (Pins 1, 3, 4, 6) routes to a separate protected signal line. This layout minimizes PCB trace inductance and ensures consistent clamping across all four SMS05T1 channels.
Does SMS05T1 meet automotive qualification standards?
Yes, SMS05T1 is AEC-Q101 qualified and PPAP capable, as confirmed in the official onsemi datasheet (Publication Order Number SMS05T1/D, Rev. 10, August 2024). The SZSMS05T1G variant explicitly carries the SZ prefix denoting automotive-grade manufacturing controls, including extended temperature operation (−55 °C to +150 °C), rigorous HTOL and TC testing, and full PPAP documentation support - making SMS05T1 suitable for infotainment, ADAS sensor interfaces, and body control module I/O protection.
What is the clamping voltage behavior of SMS05T1 under real-world surge conditions?
SMS05T1 clamps to 9.8 V at 23 A (8/20 µs waveform), as measured per IEC 61000-4-5. Its clamping curve remains stable up to 350 W peak power, with typical VC rising to ~11.5 V at 30 A. This behavior is verified in Figure 4 of the datasheet and ensures protected ICs (e.g., USB transceivers with 12 V abs max) remain within safe operating limits. Unlike bidirectional TVS devices, SMS05T1's unidirectional design avoids leakage current during normal 5 V operation - a key advantage for battery-powered systems using SMS05T1.
How does SMS05T1 compare to the older MMQA series in surge performance?
SMS05T1 delivers up to 350 W peak pulse power, significantly exceeding the legacy MMQA quad Zener series (typically rated ≤150 W). This 2.3× improvement enables SMS05T1 to handle harsher surge events such as induced lightning transients on external cables, while maintaining tighter clamping (9.8 V vs. ≥12 V for MMQA5.0) and lower leakage (<1 µA at 5 V). The monolithic silicon construction of SMS05T1 also improves channel-to-channel matching and thermal coupling - critical for consistent protection across all four lines in a single SMS05T1 device.
Is SMS05T1 compatible with lead-free reflow processes?
Yes, SMS05T1 is Pb-free and RoHS compliant, with a maximum lead solder temperature rating of 260 °C for 10 seconds - fully compatible with standard J-STD-020-compliant lead-free reflow profiles. The SC-74 package has been qualified for IPC-A-610 Class 2 and Class 3 assembly, and onsemi confirms no special pre-conditioning or moisture sensitivity level (MSL) handling beyond MSL3 is required for SMS05T1. This ensures reliable manufacturability in high-volume SMT lines without process deviation.
SMS05T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 15.5V
- Current - Peak Pulse (10/1000µs):
- 23A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 250pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SMS05T1 FAQ
1.How can I place an order for SMS05T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS05T1 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 SMS05T1 reliable?
The price and inventory of SMS05T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS05T1 is usually 5 days.
3.What payment methods are accepted for SMS05T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS05T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS05T1?
SMS05T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS05T1 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 SMS05T1?
For technical support, including SMS05T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS05T1 requirements.
6.How does Aetrix verify that SMS05T1 is sourced from the original manufacturer or authorized distributors?
All SMS05T1 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 SMS05T1 meets industry standards.
7.What is the process for return or replacement of SMS05T1?
All SMS05T1 units undergo pre-shipment inspection (PSI). If there is an issue with SMS05T1, 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 SMS05T1 part is unused and in its original packaging.
Return procedure for SMS05T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMS05T1 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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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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