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STMicroelectronics SM30T47CAY
- Part No.:
- SM30T47CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM30T47CAY.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
SM30T47CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity. It features 47 V breakdown voltage (VBR = 44.4–49 V), 64.5 V clamping voltage at 356 A (8/20 µs), 3000 W peak pulse power (10/1000 µs), 0.2 µA max leakage at 25 °C, and 175 °C maximum junction temperature - deployed in 12 V/24 V automotive power line surge protection.
For engineers reviewing the SM30T47CAY datasheet, SM30T47CAY pinout, SM30T47CAY application, or SM30T47CAY equivalent, this page delivers verified electrical specs, automotive qualification evidence (AEC-Q101), ISO-compliant surge performance data, and real-world design context for battery rail and LIN/CAN bus interface protection.
Technical Context
This bidirectional TVS uses planar silicon technology to achieve low leakage (≤0.2 µA) and high thermal stability up to Tj = 175 °C, enabling long-term reliability in under-hood environments. Its dynamic resistance of 74.6 mΩ ensures rapid voltage clamping during fast transients like ISO 10605 contact discharge (±30 kV) and ISO 7637-2 Pulse 3b (+150 V).
The device meets stringent automotive standards including IEC 61000-4-4 Level 4 (4 kV), ISO 10605 (C = 150/330 pF), and ISO 7637-2 Pulse 1 (−150 V), with clamping behavior validated across temperature (−55 °C to +175 °C) and pulse duration (8/20 µs to 10/1000 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 44.4 / 46.7 / 49 V - Ensures reliable turn-on before downstream IC damage in 12 V/24 V systems |
| VCL @ 356 A (8/20 µs) | 64.5 V - Limits transient voltage to safe level for 5 V/3.3 V microcontrollers and CAN transceivers |
| PPP (10/1000 µs) | 3000 W - Withstands load dump surges without degradation when mounted on recommended FR4 footprint |
| IR max @ VRM | 0.2 µA at 25 °C - Prevents standby current drain in always-on automotive modules (e.g., body control units) |
| Tj operating range | −55 °C to +175 °C - Supports placement near engines or in transmission control units without derating |
| AEC-Q101 qualified | Validated for automotive use per stress test requirements - eliminates need for additional qualification testing |
| Package | SMC (DO-214AB) - JEDEC-registered outline with matte tin plating, compatible with standard reflow profiles (J-STD-020 MSL 1) |
Pinout & Package
SM30T47CAY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode and Anode. The bidirectional configuration means both terminals function symmetrically as transient current paths during positive or negative voltage excursions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts reverse surge energy during ISO 7637-2 Pulse 1 (−150 V) or Pulse 3a (−220 V) |
| Cathode | Transient current entry point (positive polarity) | Accepts forward surge energy during ISO 7637-2 Pulse 2a (+112 V) or Pulse 3b (+150 V) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects both polarities of 12 V/24 V supply rails without external polarity coordination |
| Low dynamic resistance (74.6 mΩ) | Minimizes VCL rise under high-current transients - critical for protecting 5 V logic interfaces |
| AEC-Q101 qualification | Validated for automotive under-hood deployment - reduces validation burden for Tier 1 suppliers |
| ISO 10605 ±30 kV ESD immunity | Exceeds Level 4 for both air and contact discharge - suitable for exposed connectors and sensor harnesses |
| Junction temperature rating (175 °C) | Enables placement in high-ambient zones (e.g., near powertrain ECUs) without thermal derating |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Transceiver Protection |
|---|---|
|
Use Scenario: 12 V battery feed to engine ECU subjected to ISO 7637-2 Pulse 1 (−150 V) and Pulse 5b load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, limiting VIN to ≤64.5 V during 356 A surge events. Use Value: Prevents latch-up or permanent damage to MCU power management ICs and analog front-ends operating at 5 V/3.3 V. |
Use Scenario: CAN H/L lines connected to vehicle chassis ground experiencing coupled transients from adjacent high-power circuits. IC Role / Device Role / Timing Role: Bidirectional shunt protector placed between CAN_H and CAN_L, clamping differential surges within 1 ns response time. Use Value: Maintains CAN signal integrity by holding differential voltage below 2.5 V threshold during 8/20 µs spikes up to 356 A. |
| Body Control Module (BCM) LIN Interface | Automotive Infotainment Power Supply |
|
Use Scenario: LIN bus termination powered from switched 12 V rail, exposed to ISO 7637-2 Pulse 2a (+112 V) during alternator switching. IC Role / Device Role / Timing Role: Low-leakage (0.2 µA) bidirectional clamp across LIN transceiver supply pins. Use Value: Eliminates false wake-ups and communication errors while drawing negligible current in sleep mode. |
Use Scenario: 5 V DC-DC converter input in head unit subjected to repeated ISO 10605 ESD events during user interaction. IC Role / Device Role / Timing Role: Secondary surge suppressor downstream of primary fuse and LC filter, absorbing residual ±30 kV discharges. Use Value: Extends lifetime of buck controller ICs and reduces field failure rate in high-touch consumer-facing modules. |
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 SMAJ47CA | VBR = 44.7–49.4 V; VCL = 77.0 V @ 38.9 A (8/20 µs); PPP = 400 W | Lower peak power rating limits suitability for ISO 7637-2 Pulse 1/3b in 24 V systems | Select only for cost-sensitive non-critical 12 V subsystems where 3000 W capability is not required |
| Vishay SMA6J47CA | VBR = 44.7–49.4 V; VCL = 77.0 V @ 38.9 A (8/20 µs); PPP = 600 W; AEC-Q101 qualified | Same qualification but lower surge capacity - insufficient for full ISO 7637-2 compliance in power distribution nodes | Acceptable for LIN or low-energy sensor interfaces, but not for main battery rail protection |
Compared with SMAJ47CA and SMA6J47CA, SM30T47CAY delivers 5× higher peak pulse power (3000 W vs. ≤600 W) and lower clamping voltage (64.5 V vs. 77.0 V) at rated current - making it the only option among the three capable of meeting full ISO 7637-2 Pulse 1, 2a, 3a, and 3b requirements in automotive power domains.
Availability
SM30T47CAY is available at Aetrix Electronics and suitable for automotive power line protection, CAN/LIN bus interface hardening, and infotainment system ESD suppression requiring stable component supply across production lifecycles.
Supply support for SM30T47CAY 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 capabilities.
SM30T47CAY belongs to the SM30TY series of AEC-Q101-qualified TVS diodes engineered specifically for robust transient suppression in automotive electrical architectures - targeting battery rail, power distribution, and high-speed serial interface protection.
FAQ
What is the maximum clamping voltage of SM30T47CAY under ISO 7637-2 Pulse 3b conditions?
The SM30T47CAY clamps to 64.5 V at 356 A for an 8/20 µs waveform, which directly covers ISO 7637-2 Pulse 3b (VS = +150 V). Measured VCL remains stable across −55 °C to +175 °C junction temperature, ensuring consistent protection during cold cranking and hot soak conditions.
Does SM30T47CAY require derating at elevated ambient temperatures?
No derating is needed for ambient temperatures up to +125 °C when mounted on the recommended IPC7531-compliant footprint with 3.14 cm² copper area per lead. Thermal resistance drops to 40 °C/W under those conditions, maintaining Tj ≤ 175 °C even during sustained 3000 W pulses.
Can SM30T47CAY be used in 24 V commercial vehicle systems?
Yes - its 47 V VBR and 64.5 V VCL provide sufficient margin above 24 V nominal systems (max 28 V), and it passes ISO 7637-2 Pulse 1 (−150 V) and Pulse 2a (+112 V) tests at full rating. The 175 °C Tj rating supports under-hood deployment in trucks and buses.
How does the bidirectional configuration affect PCB layout versus unidirectional TVS diodes?
SM30T47CAY requires no polarity-aware routing: it connects directly across the protected line and ground (or between differential lines like CAN_H/CAN_L). Unlike unidirectional devices, there is no cathode/anode orientation constraint - simplifying layout and eliminating risk of reverse installation in high-volume assembly.
SM30T47CAY 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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
SM30T47CAY FAQ
1.How can I place an order for SM30T47CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM30T47CAY 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 SM30T47CAY reliable?
The price and inventory of SM30T47CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM30T47CAY is usually 5 days.
3.What payment methods are accepted for SM30T47CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM30T47CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM30T47CAY?
SM30T47CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM30T47CAY 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 SM30T47CAY?
For technical support, including SM30T47CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM30T47CAY requirements.
6.How does Aetrix verify that SM30T47CAY is sourced from the original manufacturer or authorized distributors?
All SM30T47CAY 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 SM30T47CAY meets industry standards.
7.What is the process for return or replacement of SM30T47CAY?
All SM30T47CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM30T47CAY, 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 SM30T47CAY part is unused and in its original packaging.
Return procedure for SM30T47CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM30T47CAY Tags
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