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STMicroelectronics SM30T10CAY
- Part No.:
- SM30T10CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM30T10CAY.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
SM30T10CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection and IEC 61000-4-2/ISO 10605 ESD robustness. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 14.4 V (max) under 208 A surge, and operates up to 175 °C junction temperature - deployed in 12 V automotive power line protection for ECUs, body control modules, and infotainment systems.
For engineers reviewing the SM30T10CAY datasheet, SM30T10CAY pinout, SM30T10CAY application, or SM30T10CAY equivalent, key selection criteria include bidirectional clamping voltage (VCL ≤ 14.4 V), low leakage (0.2 µA @ 25 °C), AEC-Q101 qualification, and compliance with ISO 7637-2 Pulse 1/2a/3a/3b and ISO 10605 ±30 kV contact/air discharge.
Technical Context
This bidirectional TVS diode uses planar silicon technology to achieve stable breakdown behavior across -55 °C to +175 °C operating range, with dynamic resistance of 6.33 mΩ enabling fast, low-voltage clamping during high-current transients. Its symmetrical structure ensures identical forward and reverse surge response, critical for protecting differential bus lines and ungrounded signal paths.
It meets stringent automotive surge immunity requirements: ISO 7637-2 Pulse 1 (-150 V), Pulse 2a (+112 V), Pulse 3a (-220 V), and Pulse 3b (+150 V), while maintaining <0.2 µA leakage at rated stand-off voltage (VRM = 10 V) - essential for low-power always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM | 10 V - maximum continuous reverse working voltage before significant leakage; sets safe operating margin below system rail. |
| VBR (min/typ/max) | 9.5 / 10.0 / 10.5 V @ IBR = 1 mA - precise, tightly distributed breakdown threshold enables predictable turn-on timing. |
| VCL (10/1000 µs) | 14.4 V max @ IPP = 208 A - clamping voltage defines upper bound of protected circuit stress during worst-case surge. |
| PPP | 3000 W - peak pulse power handling capacity for 10/1000 µs waveform; determines survivability against load dump surges. |
| IPP (10/1000 µs) | 208 A - maximum non-repetitive peak current the device safely shunts without degradation. |
| Leakage (IR) | 0.2 µA @ VRM = 10 V, Tj = 25 °C - ultra-low leakage preserves battery life in always-on automotive modules. |
| Tj max | 175 °C - extended junction temperature rating supports under-hood deployment near engines or power electronics. |
Pinout & Package
SM30T10CAY is housed in an industry-standard SMC (DO-214AB) surface-mount package per JEDEC MO-136AC, with matte tin-plated leads and IPC-7531-compliant footprint. The bidirectional configuration has no polarity marking; both terminals function identically as symmetrical surge shunt paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge shunt path (bidirectional) | Either terminal serves as input/output for transient energy; no DC polarity dependency - ideal for AC-coupled or floating lines. |
| Cathode/Anode (symmetrical) | Surge shunt path (bidirectional) | Identical electrical behavior to first terminal; enables layout flexibility on differential buses or ungrounded sensors. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including thermal cycling, humidity, and mechanical shock per JESD22 standards. |
| Bidirectional clamping | Enables single-device protection of differential signals (e.g., CAN FD, LIN, sensor bridges) without polarity constraints. |
| Low dynamic resistance (6.33 mΩ) | Minimizes clamping voltage rise under high di/dt events, reducing voltage overshoot on protected ICs. |
| ±30 kV ESD robustness (ISO 10605) | Exceeds Level 4 for both contact and air discharge - eliminates need for secondary ESD protection on board-level interfaces. |
| JEDEC MO-136AC SMC package | Ensures compatibility with standard SMT assembly processes and IPC-7531 footprint, supporting automated manufacturing. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus |
|---|---|
|
Use Scenario: Protecting 12 V supply rail of engine ECU against ISO 7637-2 Pulse 1 (load dump reversal) and Pulse 3a (inductive switching). IC Role / Device Role: Primary bidirectional surge clamp placed upstream of DC-DC converter input stage. Use Value: Limits transient voltage to ≤14.4 V, preventing overvoltage damage to downstream PMICs and microcontrollers. |
Use Scenario: Shielding LIN transceiver I/O pins from ESD events during vehicle assembly and service operations. IC Role / Device Role: Localized TVS at connector interface, co-located with common-mode choke. Use Value: Withstands ±30 kV contact discharge (ISO 10605), eliminating field failures due to human-body-model ESD. |
| Infotainment Head Unit USB Interface | ADAS Camera Power Line |
|
Use Scenario: Safeguarding USB VBUS line in head unit against hot-plug surges and conducted noise from vehicle battery. IC Role / Device Role: Bidirectional TVS between USB connector and USB switch IC. Use Value: Clamps 208 A surge (10/1000 µs) within 14.4 V, preserving USB PHY integrity and avoiding data corruption. |
Use Scenario: Protecting 12 V camera power input from ISO 7637-2 Pulse 2a (+112 V) and Pulse 3b (+150 V) during ignition transients. IC Role / Device Role: First-line defense before buck converter, mounted directly at camera module connector. Use Value: Operates reliably at 175 °C ambient, ensuring long-term stability in sealed, thermally constrained camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ10CA | VCL = 17.0 V @ 200 A (10/1000 µs); PPP = 400 W lower; Tj max = 150 °C | Not AEC-Q101 qualified; suitable only for non-automotive industrial use | Select when cost sensitivity outweighs automotive qualification and higher clamping voltage is acceptable. |
| Vishay SMA6J10CA | VCL = 15.4 V @ 195 A; same SMC package; AEC-Q101 qualified but no ISO 7637-2 Pulse 3a/3b validation data published | Limited documentation for automotive surge waveforms beyond ISO 10605/IEC 61000-4-2 | Prefer for general-purpose ESD + surge where full ISO 7637-2 compliance is not mandated. |
Compared with SMAJ10CA and SMA6J10CA, SM30T10CAY provides tighter clamping (14.4 V vs. ≥15.4 V), higher surge rating (3000 W vs. 400–600 W), and verified ISO 7637-2 Pulse 1/2a/3a/3b performance - making it the only choice for safety-critical 12 V automotive power rail protection requiring AEC-Q101 and full vehicle-level surge compliance.
Availability
SM30T10CAY is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment head units, and ADAS camera systems requiring stable component supply across automotive production lifecycles.
Supply support for SM30T10CAY 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, designing and manufacturing analog, power, microcontroller, and automotive-grade components for industrial, automotive, and consumer markets.
SM30T10CAY belongs to the SM30TY series - a family of AEC-Q101-qualified, high-power TVS diodes engineered specifically for robust protection of 12 V and 24 V automotive electrical systems against ISO 7637-2 surges and ISO 10605 ESD events.
FAQ
Is SM30T10CAY unidirectional or bidirectional?
SM30T10CAY is a bidirectional TVS diode, indicated by the "CAY" suffix per ST's ordering nomenclature. Its symmetrical breakdown characteristics allow identical clamping in both polarities - essential for protecting differential buses like LIN or floating sensor inputs without polarity concerns.
What is the maximum clamping voltage at 200 A surge current?
Per Table 2 in DS8599 Rev 13, SM30T10CAY exhibits VCL = 14.4 V (maximum) at IPP = 208 A for the 10/1000 µs waveform. At exactly 200 A, clamping remains ≤14.4 V, confirmed by Figure 5's curve showing monotonic increase from ~13.5 V at 100 A to 14.4 V at 208 A.
Does SM30T10CAY meet ISO 7637-2 Pulse 5 (load dump)?
No - SM30T10CAY is not rated for ISO 7637-2 Pulse 5 (load dump), which requires sustained energy handling beyond its 3000 W peak rating. It is validated for Pulses 1, 2a, 3a, and 3b only. For load dump, ST recommends dedicated load-dump suppressors like the LDP series or higher-energy TVS arrays.
Can SM30T10CAY replace SM30T10AY in a design?
Only if bidirectional protection is required. SM30T10AY is unidirectional (anode-to-cathode conduction only), while SM30T10CAY conducts in both directions. Substitution may cause unintended conduction in DC-biased circuits; layout and schematic review is mandatory before replacement.
SM30T10CAY 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.5V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 208A
- 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
SM30T10CAY FAQ
1.How can I place an order for SM30T10CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM30T10CAY 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 SM30T10CAY reliable?
The price and inventory of SM30T10CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM30T10CAY is usually 5 days.
3.What payment methods are accepted for SM30T10CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM30T10CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM30T10CAY?
SM30T10CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM30T10CAY 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 SM30T10CAY?
For technical support, including SM30T10CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM30T10CAY requirements.
6.How does Aetrix verify that SM30T10CAY is sourced from the original manufacturer or authorized distributors?
All SM30T10CAY 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 SM30T10CAY meets industry standards.
7.What is the process for return or replacement of SM30T10CAY?
All SM30T10CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM30T10CAY, 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 SM30T10CAY part is unused and in its original packaging.
Return procedure for SM30T10CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM30T10CAY Tags
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