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STMicroelectronics SM30T6.8AY
- Part No.:
- SM30T6.8AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM30T6.8AY.pdf
- Description:
- TVS DIODE 5VWM 9.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,329
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Product details
Overview
SM30T6.8AY from STMicroelectronics is a unidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection in 12 V vehicle systems. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 9.2 V (max) under 327 A surge, and features 6.8 V breakdown voltage (VBR = 6.4–7.1 V), 0.2 µA leakage at 25 °C, and 175 °C maximum junction temperature - deployed in engine control units, body electronics, and infotainment power rails.
For engineers reviewing the SM30T6.8AY datasheet, SM30T6.8AY pinout, SM30T6.8AY application, or SM30T6.8AY equivalent, key selection criteria include clamping voltage (VCL ≤ 9.2 V @ 327 A), low dynamic resistance (RD = 4.53 mΩ), AEC-Q101 qualification, and compatibility with ISO 10605 ±30 kV ESD and ISO 7637-2 Pulse 1/2a/3a/3b transients.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (0.2 µA @ VRM) and high thermal stability up to Tj = 175 °C, enabling long-term reliability in harsh automotive environments. Its unidirectional configuration provides forward conduction only during negative transients, making it suitable for DC-biased lines like battery-supplied ECUs.
The device meets stringent automotive surge standards: ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), with clamping performance validated across initial junction temperatures from −55 °C to +175 °C and pulse durations from 10 µs to 1000 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 6.4 / 6.8 / 7.1 V - ensures reliable turn-on before system-level overvoltage damage occurs in 12 V automotive rails |
| VCL @ IPP | 9.2 V @ 327 A (10/1000 µs) - limits downstream IC voltage stress during load dump or inductive switching events |
| RD | 4.53 mΩ - minimizes clamping voltage rise under high-current surges, improving protection margin |
| IR @ VRM | 0.2 µA @ 5 V - enables ultra-low standby current in always-on modules without battery drain concerns |
| PPP | 3000 W (10/1000 µs) - sustains high-energy transients per ISO 7637-2 without degradation |
| Tj max | +175 °C - supports operation in under-hood locations near engines or power converters |
| AEC-Q101 | Qualified - certified for automotive use per stress test requirements including HTOL, TC, and HAST |
Pinout & Package
SM30T6.8AY is housed in an industry-standard SMC (DO-214AB) surface-mount package with JEDEC-registered outline, matte tin-plated leads, and IPC-7531-compliant footprint. The package measures 5.55–6.25 mm × 7.75–8.15 mm × 2.45 mm max height and supports reflow soldering per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Surge current sink | Connected to protected line; conducts during positive transients relative to ground |
| Anode | Reference node | Typically tied to system ground or low-side return path; defines unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and chassis applications per stress test requirements |
| Low leakage current | 0.2 µA @ 25 °C enables use in always-on circuits without compromising battery life |
| High junction temperature rating | 175 °C max Tj ensures stable clamping performance in hot ambient conditions |
| ISO 10605 ESD robustness | ±30 kV air/contact discharge (C = 150/330 pF) exceeds automotive level 4 requirements |
| JEDEC-compliant SMC package | Enables drop-in replacement in existing PCB layouts and automated assembly compatibility |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Line |
|---|---|
Use Scenario: Protects 12 V supply rail against load dump (ISO 7637-2 Pulse 5b) and alternator-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and upstream fuse, clamping transients before they reach LDOs and microcontrollers. Use Value: Limits VCL to 9.2 V during 327 A surge, preserving 5 V/3.3 V regulator input ratings and preventing brownout resets. |
Use Scenario: Shields high-speed CAN FD transceivers from ESD and coupled noise on vehicle harnesses. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 1000 nF @ 0 V) installed at connector interface, shunting fast transients before signal integrity degrades. Use Value: Withstands ±30 kV contact discharge per ISO 10605 while adding <1 pF parasitic capacitance at operating bias, avoiding CAN bit timing skew. |
| Infotainment Head Unit USB Power Port | ADAS Camera Power Supply |
Use Scenario: Guards 5 V USB VBUS line against hot-plug transients and reverse-polarity faults in center console ports. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-VBUS, suppressing positive spikes without affecting steady-state regulation. Use Value: Clamps 10/1000 µs surges to ≤9.2 V while maintaining 0.2 µA leakage - critical for low-power USB suspend mode compliance. |
Use Scenario: Safeguards 12 V camera module input against ignition noise and cable discharge events in rear-view or surround-view systems. IC Role / Device Role / Timing Role: Mounted at board edge near FAKRA connector, absorbing ISO 7637-2 Pulse 3a (−220 V) and Pulse 2a (+112 V) without derating. Use Value: Delivers 3000 W peak power handling at Tj = 175 °C, ensuring protection remains effective even inside sealed, thermally constrained camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.8A | Lower PPP (400 W), higher VCL (11.2 V @ 35.5 A), SMA package (smaller thermal mass) | Not qualified to AEC-Q101; limited to non-automotive or low-risk auxiliary circuits | Select only for cost-sensitive consumer or industrial designs where ISO 7637-2 compliance is not required |
| TPSMD6.8A | Same SMC package, but lower surge rating (2000 W), higher RD (6.2 mΩ), and no AEC-Q101 documentation | Lacks full ISO 10605 ±30 kV validation and high-temperature derating curves | Acceptable for legacy automotive subsystems with relaxed surge margins, but not for new ADAS or powertrain designs |
Compared with SMAJ6.8A and TPSMD6.8A, SM30T6.8AY provides 7.5× higher peak power, 2.2× lower clamping voltage at rated current, and documented AEC-Q101 qualification - making it the only choice for safety-critical 12 V rail protection where ISO 7637-2 Pulse 1/2a/3a/3b compliance is mandatory.
Availability
SM30T6.8AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment head units requiring stable component supply across extended automotive production lifecycles.
Supply support for SM30T6.8AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering automotive, industrial, and power management solutions since 1987.
The SM30Txx series belongs to ST's automotive-grade TVS portfolio, engineered specifically for robust transient immunity in 12 V and 24 V vehicle networks - targeting ECU, ADAS, and electrification subsystems demanding AEC-Q101 reliability and ISO 7637-2 compliance.
FAQ
What is the maximum clamping voltage of SM30T6.8AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 9.2 V when subjected to a 327 A peak pulse current with 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases slightly with junction temperature due to the αT coefficient (10 × 10−4/°C), reaching ~9.6 V at Tj = 125 °C per datasheet calculation.
Is SM30T6.8AY suitable for bidirectional signal line protection?
No - SM30T6.8AY is unidirectional and conducts only during positive transients relative to ground. For bidirectional protection (e.g., CAN, LIN, or USB D+/D−), the bidirectional variant SM30T6.8CAY must be used, which clamps symmetrically for both polarities and has identical VBR and surge ratings.
Does SM30T6.8AY meet ISO 7637-2 Pulse 5b (load dump) requirements?
SM30T6.8AY is rated for ISO 7637-2 Pulses 1, 2a, 3a, and 3b, but not Pulse 5b (load dump), which requires sustained energy dissipation over 400 ms. Its 3000 W rating applies only to short-duration transients (≤1 ms). For load dump, higher-energy TVS arrays or dedicated load-dump suppressors are required.
What is the thermal resistance (Rth(j-a)) of SM30T6.8AY on a standard FR4 PCB?
On a recommended footprint with 70 µm copper thickness, Rth(j-a) is 120 °C/W for a single pulse. This value improves to ~60 °C/W with 2 cm² of copper area under each lead, as shown in Figure 12 of DS8599. Continuous power dissipation is limited by this thermal resistance and ambient temperature constraints.
SM30T6.8AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM30TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.45V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 327A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM30T6.8AY FAQ
1.How can I place an order for SM30T6.8AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM30T6.8AY 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 SM30T6.8AY reliable?
The price and inventory of SM30T6.8AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM30T6.8AY is usually 5 days.
3.What payment methods are accepted for SM30T6.8AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM30T6.8AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM30T6.8AY?
SM30T6.8AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM30T6.8AY 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 SM30T6.8AY?
For technical support, including SM30T6.8AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM30T6.8AY requirements.
6.How does Aetrix verify that SM30T6.8AY is sourced from the original manufacturer or authorized distributors?
All SM30T6.8AY 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 SM30T6.8AY meets industry standards.
7.What is the process for return or replacement of SM30T6.8AY?
All SM30T6.8AY units undergo pre-shipment inspection (PSI). If there is an issue with SM30T6.8AY, 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 SM30T6.8AY part is unused and in its original packaging.
Return procedure for SM30T6.8AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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