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STMicroelectronics SM6T30CAY
- Part No.:
- SM6T30CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T30CAY.pdf
- Description:
- TVS DIODE 25.6VWM 41.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:31,606
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Product details
Overview
SM6T30CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMB package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity. It features a 30 V standoff voltage (VRM), 41.5 V max clamping voltage at 14.5 A (10/1000 µs), 600 W peak pulse power, 0.2 µA leakage at 25 °C, and operates up to 150 °C junction temperature - deployed in 12 V automotive power line surge protection.
For engineers reviewing the SM6T30CAY datasheet, SM6T30CAY pinout, SM6T30CAY application, or SM6T30CAY equivalent, this device is selected for high-reliability bidirectional clamping in battery-supplied ECUs, infotainment power rails, and CAN/LIN transceiver protection where low leakage, AEC-Q101 qualification, and IEC 61000-4-2 Level 4 compliance are mandatory.
Technical Context
This bidirectional TVS diode uses planar silicon technology to achieve stable breakdown behavior across temperature (αT = 9.7 × 10⁻⁴ /°C), low dynamic resistance (RD = 0.69 Ω), and minimal junction capacitance (< 100 pF at 1 V). Its symmetrical avalanche structure enables identical clamping in both polarities, critical for protecting AC-coupled or floating signal lines.
It 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), while sustaining 30 kV contact/air discharge per ISO 10605 (C = 330 pF, R = 330 Ω) - validated at Tj = 150 °C with derated power up to 515 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - maximum continuous reverse operating voltage before significant leakage; defines minimum system operating margin. |
| Breakdown Voltage (VBR) | 25.6–31.5 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during transients. |
| Clamping Voltage (VCL) | 41.5 V at 14.5 A (10/1000 µs) - peak voltage seen by protected circuit under standardized surge; limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - energy-handling capability at 25 °C ambient; derates to 515 W at 150 °C junction. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - ultra-low DC loading on sensitive analog or always-on circuits. |
| Junction Temperature Range | −55 to +150 °C - supports under-hood deployment without thermal derating penalties in engine control modules. |
| AEC-Q101 Qualified | Validated for automotive use per stress test requirements including HTGB, HTRB, and temperature cycling - required for ASIL-B/C systems. |
Pinout & Package
The SM6T30CAY is housed in an SMB (DO-214AA) surface-mount package with two terminals: Cathode (K) and Anode (A), arranged in a symmetrical bidirectional configuration. The package measures 3.30–3.95 mm (D) × 5.10–5.60 mm (E) × 1.90–2.45 mm (A1) and features matte tin-plated leads compliant with J-STD-002 and JEDEC registered outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Terminal 1 (cathode marking side) | One polarity of bidirectional clamping path; connects to line under protection (e.g., CAN_H or battery rail). |
| Cathode (K) | Terminal 2 (opposite cathode marking) | Second polarity of clamping path; ties to reference (e.g., GND or battery return) - symmetric conduction in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR (25.6–31.5 V) and VCL (41.5 V) in both directions - eliminates polarity dependency in differential or floating bus protection. |
| Low dynamic resistance | RD = 0.69 Ω - minimizes voltage overshoot during fast transients (e.g., ISO 7637-2 Pulse 3b), improving clamping precision. |
| High-temperature reliability | Rated for 150 °C junction operation with <1 µA leakage at 85 °C - enables placement near heat sources in power distribution units. |
| AEC-Q101 qualification | Passed HTGB, HTRB, and temperature cycling per AEC standard - satisfies OEM requirements for safety-critical vehicle networks. |
| ESD robustness | 30 kV air/contact discharge (ISO 10605, C = 330 pF/R = 330 Ω) - exceeds Level 4, eliminating need for secondary ESD stages in body control modules. |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Rail Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply input of BCM microcontrollers against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between battery rail and LDO input, absorbing ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V). Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V regulators by limiting transient voltage to ≤41.5 V at 14.5 A, enabling single-stage protection. |
Use Scenario: Safeguarding USB-C and HDMI power inputs in head unit against hot-swap surges and ESD events. IC Role / Device Role / Timing Role: Low-capacitance (≈70 pF) bidirectional TVS placed at connector entry point, shunting ISO 10605 30 kV discharges before signal conditioning ICs. Use Value: Maintains signal integrity with <100 pF junction capacitance while meeting IEC 61000-4-2 Level 4 - avoids data corruption in high-speed interfaces. |
| CAN FD Transceiver Interface | Electric Power Steering (EPS) Sensor Supply |
|
Use Scenario: Clamping common-mode surges on CAN_H/CAN_L lines in 5 Mbps FD networks exposed to chassis ground bounce. IC Role / Device Role / Timing Role: Dual SM6T30CAY devices (one per line) referenced to chassis ground, suppressing ±30 kV ESD and ISO 7637-2 Pulse 3a (−220 V). Use Value: Ensures uninterrupted CAN communication by clamping within 1 ns response time and maintaining <1.5 V differential noise margin during transients. |
Use Scenario: Protecting 5 V sensor supply rail in EPS motor control units subjected to ignition noise and relay switching spikes. IC Role / Device Role / Timing Role: TVS placed upstream of linear regulator feeding torque/position sensors, handling repetitive 100 V/10 ms pulses per ISO 7637-2 Pulse 2a. Use Value: Delivers 600 W surge handling at 25 °C and 515 W at 150 °C - sustains protection over full vehicle lifetime without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA | Same 30 V VRM, but lower PPP = 400 W (10/1000 µs); RD = 1.05 Ω; not AEC-Q101 qualified. | Limited to non-automotive industrial use; insufficient for ISO 7637-2 Pulse 1 in 12 V systems. | Select only for cost-sensitive consumer electronics with ambient <85 °C and no automotive certification requirement. |
| TPSMD30C | 30 V VRM, 600 W PPP, AEC-Q101 qualified, but higher VCL = 48.4 V at 12.4 A; RD = 1.2 Ω. | Higher clamping voltage risks overvoltage stress on 3.3 V logic; less suitable for tight-margin LDO inputs. | Prefer when footprint compatibility with SMA package is required, but verify downstream IC absolute maximum ratings exceed 48.4 V. |
Compared with SMAJ30CA and TPSMD30C, SM6T30CAY delivers optimal balance of low clamping (41.5 V), AEC-Q101 compliance, and SMB footprint - making it the preferred choice for space-constrained, thermally demanding automotive power rail protection.
Availability
SM6T30CAY is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power supplies, and CAN FD interface protection requiring stable component supply across multi-year production cycles.
Supply support for SM6T30CAY 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, specializing in automotive, industrial, and power management solutions with vertical manufacturing and broad IP portfolio.
The SM6TY series targets automotive electronics protection, engineered specifically to meet ISO 7637-2, ISO 10605, and AEC-Q101 requirements for next-generation vehicle ECUs and ADAS subsystems.
FAQ
What is the maximum clamping voltage of SM6T30CAY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 41.5 V at 14.5 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature due to the positive temperature coefficient (αT = 9.7 × 10⁻⁴ /°C), reaching ~44.2 V at 150 °C.
Is SM6T30CAY unidirectional or bidirectional, and how is polarity identified?
SM6T30CAY is a bidirectional TVS diode - it clamps symmetrically in both forward and reverse directions. Polarity is not applicable; the device has no cathode marking distinction. The "CAY" suffix explicitly denotes bidirectional configuration per ST's ordering scheme.
Can SM6T30CAY replace SM6T30AY in a design?
No - SM6T30AY is unidirectional (anode-to-cathode only), while SM6T30CAY is bidirectional. Substituting them requires verifying circuit topology: unidirectional parts require correct polarity orientation and cannot protect AC or floating nodes, whereas bidirectional parts enable simpler layout in differential or ground-referenced lines.
Does SM6T30CAY meet ISO 7637-2 Pulse 1 requirements for 12 V systems?
Yes - it is rated for −150 V Pulse 1 (inductive load dump) per ISO 7637-2, with verified clamping performance and thermal stability up to 150 °C junction temperature. Its 600 W peak power rating exceeds the energy content of Pulse 1, ensuring reliable protection without failure.
SM6T30CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.5V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SM6T30CAY FAQ
1.How can I place an order for SM6T30CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T30CAY 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 SM6T30CAY reliable?
The price and inventory of SM6T30CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T30CAY is usually 5 days.
3.What payment methods are accepted for SM6T30CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T30CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T30CAY?
SM6T30CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T30CAY 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 SM6T30CAY?
For technical support, including SM6T30CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T30CAY requirements.
6.How does Aetrix verify that SM6T30CAY is sourced from the original manufacturer or authorized distributors?
All SM6T30CAY 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 SM6T30CAY meets industry standards.
7.What is the process for return or replacement of SM6T30CAY?
All SM6T30CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM6T30CAY, 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 SM6T30CAY part is unused and in its original packaging.
Return procedure for SM6T30CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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