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STMicroelectronics SMA6T30AY
- Part No.:
- SMA6T30AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6T30AY.pdf
- Description:
- TVS DIODE 25.6VWM 53.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,886
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Product details
Overview
SMA6T30AY from STMicroelectronics is a unidirectional 600 W automotive-grade transient voltage suppression (TVS) diode in SMA package, designed to clamp transients up to 41.5 V at 14.5 A (10/1000 µs), with 30 V standoff voltage and 0.2 µA leakage at 25 °C, for protecting CAN, LIN, and power supply lines in 12 V automotive systems.
For engineers reviewing the SMA6T30AY datasheet, SMA6T30AY pinout, SMA6T30AY application, or SMA6T30AY equivalent, key selection criteria include clamping voltage under ISO 7637-2 Pulse 1 (–150 V), junction temperature derating above 25 °C, bidirectional vs. unidirectional polarity configuration, and compliance with AEC-Q101, ISO 10605 (±30 kV ESD), and IEC 61000-4-4 Level 4 (4 kV EFT).
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (<1 µA at 85 °C) and high thermal stability up to 150 °C junction temperature. Its unidirectional configuration provides asymmetric clamping-forward conduction during negative transients and reverse avalanche clamping during positive surges-making it suitable for DC-biased signal and power rails.
The device 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), with dynamic resistance of 0.69 Ω at 10/1000 µs and 0.293 Ω at 8/20 µs, enabling precise voltage limiting in fast-rising transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - Maximum continuous reverse operating voltage before breakdown begins. |
| Breakdown Voltage (VBR) | 28.5 V min @ IBR = 1 mA - Ensures reliable triggering before system-level damage occurs. |
| Clamping Voltage (VCL) | 41.5 V @ IPP = 14.5 A (10/1000 µs) - Limits peak voltage seen by protected ICs during surge events. |
| Peak Pulse Power | 600 W @ 10/1000 µs - Sustains energy dissipation without failure in standard automotive surge tests. |
| Leakage Current (IRM) | 0.2 µA @ VRM = 30 V, 25 °C - Minimizes standby power loss and avoids false triggering in low-current circuits. |
| Junction Temperature Range | –55 °C to +150 °C - Supports operation in engine bay and under-hood environments. |
| ESD Withstand | ±30 kV air/contact discharge (ISO 10605, C = 150 pF/R = 330 Ω) - Exceeds Level 4 for robust ESD protection. |
Pinout & Package
Package: SMA (DO-214AC), JEDEC-registered surface-mount outline with matte tin-plated leads, footprint per IPC7531, thermal resistance Rth(j-a) = 4.5 °C/W on 1 cm² copper (FR4 board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink | Connected to protected line; conducts avalanche current during overvoltage events. |
| Anode | Reference / ground return | Connected to system ground or lower-potential rail; completes clamping path during transient. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, vibration, and lifetime stress conditions. |
| Low dynamic resistance | 0.69 Ω (10/1000 µs) - Enables tighter clamping and faster response to fast-rising transients. |
| High-temperature reliability | 150 °C max Tj - Maintains stable VBR and leakage performance in under-hood applications. |
| Automotive surge compliance | Fully tested per ISO 7637-2 Pulses 1, 2a, 3a, 3b - Ready for deployment in 12 V vehicle networks. |
| ESD robustness | ±30 kV contact/air (ISO 10605) - Eliminates need for secondary ESD protection in many designs. |
Applications
| Automotive CAN Bus Protection | 12 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines in body control modules against load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H and ground, clamping positive transients while blocking reverse leakage. Use Value: Limits voltage to ≤41.5 V during ISO 7637-2 Pulse 2a (+112 V), preserving CAN transceiver integrity without adding capacitance. | Use Scenario: Safeguarding microcontroller power inputs in infotainment head units exposed to battery disconnection events. IC Role / Device Role / Timing Role: Standoff-rated TVS connected from 12 V rail to chassis ground, absorbing Pulse 1 (–150 V) energy. Use Value: Clamps to 41.5 V within 1 µs, preventing brownout or latch-up in downstream LDOs and PMICs. |
| LIN Bus Transient Suppression | Engine Control Unit (ECU) Sensor Interface |
Use Scenario: Shielding LIN slave nodes (e.g., door module sensors) from coupled noise on shared harnesses. IC Role / Device Role / Timing Role: Low-leakage unidirectional TVS on LIN bus line, referenced to local ground. Use Value: 0.2 µA leakage at 25 °C ensures minimal impact on LIN's 1 mA sleep current budget. | Use Scenario: Protecting analog sensor inputs (e.g., MAP, IAT) in engine ECUs from alternator ripple and ignition coil coupling. IC Role / Device Role / Timing Role: TVS placed at connector entry point, shunting transients before signal conditioning circuitry. Use Value: 0.69 Ω dynamic resistance enables sub-10 ns response, capturing fast spikes before op-amp input stages saturate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6T30CAY | Bidirectional variant; symmetric clamping for AC-coupled or floating lines. | Required where both positive and negative transients exceed VRM (e.g., differential buses). | Select when protecting bidirectional signals like RS-485 or isolated CAN without DC bias. |
| SMAJ30A | Same 30 V VRM but lower 400 W peak power (10/1000 µs); higher VCL = 48.4 V @ 12.3 A. | Less margin for ISO 7637-2 Pulse 1 energy absorption; not AEC-Q101 qualified. | Acceptable only in non-automotive industrial applications with relaxed surge requirements. |
Compared with SMA6T30CAY and SMAJ30A, SMA6T30AY offers superior automotive qualification, lower clamping voltage, and higher pulse power-critical for meeting OEM-level surge immunity without design margin compromise.
Availability
SMA6T30AY is available at Aetrix Electronics and suitable for automotive electronics, industrial control panels, and transportation infrastructure projects requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMA6T30AY 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 microcontrollers, power devices, sensors, and protection components for automotive, industrial, and consumer markets.
The SMA6TY series belongs to ST's automotive-grade Transil™ TVS portfolio, engineered specifically for robust transient suppression in 12 V and 24 V vehicle electrical systems compliant with ISO 7637-2 and ISO 10605.
FAQ
What is the maximum clamping voltage of SMA6T30AY under an 8/20 µs surge?
The clamping voltage is 53.5 V at 75.0 A for an 8/20 µs waveform, measured at 25 °C ambient. This value increases with junction temperature due to the αT coefficient of 9.7 × 10−4/°C, requiring derating above 25 °C per the datasheet formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Is SMA6T30AY suitable for protecting a 5 V logic interface?
No-its 30 V standoff voltage and 28.5 V minimum breakdown make it incompatible with 5 V systems. Using it would leave the protected circuit fully exposed to transients below 28.5 V. For 5 V interfaces, select a TVS with VRM ≤ 5.5 V, such as SMA6T5.0A or SMBJ5.0A.
How does the unidirectional configuration affect PCB layout?
The cathode band must be oriented toward the protected line (e.g., CAN_H), with the anode tied to ground. Reversal causes forward conduction during normal operation, resulting in excessive leakage and potential damage. Polarity must match the DC bias direction of the protected node.
Does SMA6T30AY require external heat sinking in typical automotive applications?
No-its SMA package achieves Rth(j-a) = 4.5 °C/W on 1 cm² copper, sufficient for single-pulse 600 W dissipation. Continuous surge testing requires verifying junction temperature rise using Zth(j-a) curves; no added heatsink is needed for ISO 7637-2 compliance in standard layouts.
SMA6T30AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 75A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6T30AY FAQ
1.How can I place an order for SMA6T30AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6T30AY 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 SMA6T30AY reliable?
The price and inventory of SMA6T30AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6T30AY is usually 5 days.
3.What payment methods are accepted for SMA6T30AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6T30AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6T30AY?
SMA6T30AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6T30AY 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 SMA6T30AY?
For technical support, including SMA6T30AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6T30AY requirements.
6.How does Aetrix verify that SMA6T30AY is sourced from the original manufacturer or authorized distributors?
All SMA6T30AY 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 SMA6T30AY meets industry standards.
7.What is the process for return or replacement of SMA6T30AY?
All SMA6T30AY units undergo pre-shipment inspection (PSI). If there is an issue with SMA6T30AY, 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 SMA6T30AY part is unused and in its original packaging.
Return procedure for SMA6T30AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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