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STMicroelectronics SMA6T47AY
- Part No.:
- SMA6T47AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6T47AY.pdf
- Description:
- TVS DIODE 40VWM 73.6VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,265
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Product details
Overview
SMA6T47AY from STMicroelectronics is a unidirectional 600 W automotive-grade transient voltage suppression (TVS) diode in SMA package, designed to protect 48 V automotive power lines against ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) and ESD per ISO 10605 (±30 kV air/contact discharge). It features 46.7 V breakdown voltage (VBR min), 62.8 V clamping voltage (VCL) at 9.7 A (10/1000 µs), and ≤0.2 µA leakage at 25 °C.
For engineers reviewing the SMA6T47AY datasheet, SMA6T47AY pinout, SMA6T47AY application, or SMA6T47AY equivalent, this device is selected for robust overvoltage protection in engine control units (ECUs), body control modules (BCMs), and ADAS power supply rails where high junction temperature operation (Tj up to 150 °C), low leakage, and AEC-Q101 qualification are mandatory.
Technical Context
The SMA6T47AY employs planar silicon junction technology optimized for stable VBR drift (αT = 10.1 × 10−4/°C) and low dynamic resistance (RD = 1.42 Ω) under surge conditions. Its unidirectional configuration enables asymmetric clamping on positive transients only, with reverse standoff voltage (VRWM) of 40 V - suitable for 48 V nominal systems with ±20 % tolerance.
It meets IEC 61000-4-4 Level 4 (4 kV), exceeds ISO 10605 Level 4 (±30 kV), and withstands ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) without degradation. Thermal design leverages JEDEC DO-214AC (SMA) package with Rth(j-a) ≈ 120 °C/W on 1 cm² FR4 copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; matches 48 V system derating. |
| VBR (min) | 46.7 V at IBR = 1 mA - Ensures reliable turn-on above normal line transients while avoiding false triggering. |
| VCL @ 9.7 A | 62.8 V (10/1000 µs) - Clamps 48 V rail surges to safe levels for downstream 65 V-rated MOSFETs and regulators. |
| PPP | 600 W (10/1000 µs) - Sustains automotive load dump and alternator surge events without failure. |
| IR @ 25 °C | ≤0.2 µA - Minimizes standby current loss in always-on vehicle modules (e.g., CAN wake-up circuits). |
| Tj max | +150 °C - Enables placement near hot components (e.g., power inductors, DC-DC converters) in engine bay ECUs. |
| AEC-Q101 | Qualified - Validated for automotive under-hood reliability including temperature cycling, HTRB, and ESD stress. |
Pinout & Package
Package: SMA (JEDEC DO-214AC), surface-mount, single-diode configuration with cathode band marking. Dimensions: 4.80–5.35 mm (E), 2.25–2.90 mm (D), 1.90–2.45 mm (A1), 0.75–1.50 mm (L). Matte tin-plated leads, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to 48 V supply rail; absorbs positive surge energy when cathode is grounded. |
| Cathode | Clamp reference / ground return | Typically tied to chassis or power ground; defines clamping threshold relative to ground potential. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Withstands Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) without parameter shift. |
| ESD robustness | ±30 kV air/contact discharge (ISO 10605, C = 150/330 pF, R = 330 Ω) - eliminates need for secondary ESD protection. |
| Low thermal drift | αT = 10.1 × 10−4/°C - maintains tight VBR stability across −40 °C to +150 °C junction range. |
| High surge margin | Dynamic resistance RD = 1.42 Ω - limits VCL rise under fast 8/20 µs surges (73.6 V @ 48 A). |
| AEC-Q101 qualification | Validated for automotive life-cycle stress including HTGB, HTRB, TCT, and mechanical shock - supports 15-year vehicle service life. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protection of 48 V battery feed to microcontroller power supply and CAN transceiver VCC. IC Role / Device Role: Primary overvoltage clamp on main 48 V input rail. Use Value: Prevents latch-up or destruction of 65 V-rated LDOs and CAN PHYs during load dump and jump-start events. |
Use Scenario: Surge suppression on LIN bus power line and door module motor driver inputs. IC Role / Device Role: Unidirectional TVS placed between 48 V supply and local ground plane. Use Value: Maintains <1 µA leakage at 85 °C to avoid draining always-on LIN nodes during vehicle sleep mode. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) |
|
Use Scenario: Input protection for 48 V-to-5 V DC-DC converter powering image sensor and ISP. IC Role / Device Role: First-stage transient suppressor upstream of filter inductor and input capacitor. Use Value: Limits peak voltage to ≤63 V during ISO 7637-2 Pulse 3b (+150 V), ensuring converter IC survival. |
Use Scenario: Protection of gate driver supply rail feeding 48 V motor bridge MOSFETs. IC Role / Device Role: Clamp element referenced to motor controller ground, absorbing regenerative spikes. Use Value: Withstands repeated 10/1000 µs surges up to 600 W without parameter degradation over 10,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6T47A | No AEC-Q101 qualification; same electrical specs (VRWM = 40 V, VCL = 62.8 V @ 9.7 A). | Not approved for automotive safety-critical systems; limited to industrial or consumer 48 V supplies. | Select only if AEC-Q101 is not required and cost sensitivity outweighs long-term reliability validation. |
| SMCJ48A | Higher PPP = 1500 W (10/1000 µs); larger SMC package (DO-214AB); VRWM = 48 V, VCL = 77.4 V @ 19.4 A. | Better suited for 48 V systems with higher surge energy (e.g., heavy-duty truck alternator dumps). | Choose when system-level testing shows 600 W insufficient; accept larger footprint and higher clamping voltage. |
Compared with SMA6T47A and SMCJ48A, SMA6T47AY delivers certified automotive reliability in compact SMA form factor, balancing clamping performance, leakage, and thermal capability for space-constrained ECU designs - whereas SMA6T47A lacks qualification and SMCJ48A trades size for higher surge margin.
Availability
SMA6T47AY is available at Aetrix Electronics and suitable for engine control units, ADAS camera power supplies, and electric power steering modules requiring stable component supply across extended automotive product lifecycles.
Supply support for SMA6T47AY 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 discrete solutions with emphasis on functional safety and environmental compliance.
The SMA6TY series belongs to ST's Transil™ automotive TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V/48 V vehicle architectures - prioritizing low leakage, high Tj, and AEC-Q101 validation.
FAQ
What is the maximum clamping voltage of SMA6T47AY under an 8/20 µs surge?
The SMA6T47AY clamps to 73.6 V at 48 A under 8/20 µs waveform (per Table 2, DS6931 Rev 9). This value is derived from VCL = VBR(max) + RD × IPP, where VBR(max) = 49.1 V and RD = 1.42 Ω. It ensures compatibility with 80 V-rated downstream FETs and regulators in 48 V systems.
Can SMA6T47AY be used in bidirectional configurations?
No - SMA6T47AY is unidirectional only, with cathode-marked polarity. For bidirectional protection in AC-coupled or floating-rail applications, use SMA6T47CAY (same VRWM, VBR, and clamping specs but symmetrical breakdown in both directions).
How does SMA6T47AY perform at elevated junction temperatures?
VBR increases linearly with junction temperature at αT = 10.1 × 10−4/°C. At Tj = 125 °C, VBR(min) rises to ~48.8 V (46.7 V × [1 + 0.00101 × (125 − 25)]). Leakage remains ≤1 µA up to 85 °C per datasheet, supporting under-hood deployment.
Is the SMA6T47AY footprint compatible with standard SMA land patterns?
Yes - it uses JEDEC DO-214AC outline with recommended PCB footprint dimensions of 5.43 mm × 1.40 mm (length × width) per Figure 18. Copper pad area directly impacts thermal resistance: Rth(j-a) drops from 120 °C/W (1 cm²) to ~65 °C/W with 3 cm² total copper under both leads.
SMA6T47AY 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 73.6V
- Current - Peak Pulse (10/1000µs):
- 48A (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)
SMA6T47AY FAQ
1.How can I place an order for SMA6T47AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6T47AY 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 SMA6T47AY reliable?
The price and inventory of SMA6T47AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6T47AY is usually 5 days.
3.What payment methods are accepted for SMA6T47AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6T47AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6T47AY?
SMA6T47AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6T47AY 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 SMA6T47AY?
For technical support, including SMA6T47AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6T47AY requirements.
6.How does Aetrix verify that SMA6T47AY is sourced from the original manufacturer or authorized distributors?
All SMA6T47AY 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 SMA6T47AY meets industry standards.
7.What is the process for return or replacement of SMA6T47AY?
All SMA6T47AY units undergo pre-shipment inspection (PSI). If there is an issue with SMA6T47AY, 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 SMA6T47AY part is unused and in its original packaging.
Return procedure for SMA6T47AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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