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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

STMicroelectronics SM15T47CAY

Name: SM15T47CAY
Brand: STMicroelectronics
SKU: SM15T47CAY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SM15T47CAY

Manufacturer:: STMicroelectronics

Category:: TVS Diodes

Package:: DO-214AB, SMC

Datasheet:: SM15T47CAY.pdf

Description:: TVS DIODE 40.2VWM 84VC SMC

Quantity:: RFQ Add To RFQ list

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Inventory:6,889

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Product details

Overview

SM15T47CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppressor (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection and ESD immunity per ISO 10605. It features 47 V breakdown voltage (V_BR = 40.2–49.4 V), 64.5 V clamping voltage (V_CL) at 23.2 A (10/1000 µs), 1500 W peak pulse power, and operates up to 150 °C junction temperature - deployed in 12 V automotive power line surge protection.

For engineers reviewing the SM15T47CAY datasheet, SM15T47CAY pinout, SM15T47CAY application, or SM15T47CAY equivalent, this part is selected for high-reliability bidirectional clamping in battery-supplied vehicle subsystems where low leakage (<1 µA at 85 °C), AEC-Q101 qualification, and IEC 61000-4-4 Level 4 compliance are mandatory.

Technical Context

This TVS diode uses planar silicon technology to achieve stable V_BR temperature coefficient (α_T = 10.1 × 10⁻⁴/°C) and low dynamic resistance (R_D = 0.653 Ω at 10/1000 µs). Its bidirectional symmetry enables identical clamping behavior for positive and negative transients without polarity dependence.

It meets ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) requirements for 12 V systems, with verified performance up to T_j = 150 °C and 1250 W derated peak power under hot conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR (min/typ/max)	40.2 / 44.7 / 49.4 V - ensures reliable turn-on before downstream IC damage during 12 V system surges
V_CL @ 23.2 A (10/1000 µs)	64.5 V - limits voltage seen by protected load during ISO 7637-2 Pulse 1 and Pulse 3a events
I_PP (8/20 µs)	119 A - supports high-energy ESD and lightning-induced transients per IEC 61000-4-5
R_D	0.653 Ω - minimizes clamping voltage rise under high-current pulses, improving protection margin
I_R @ V_RM (85 °C)	1 µA - prevents excessive standby current drain in always-on automotive modules
T_j max	150 °C - enables placement near heat sources (e.g., engine control units) without derating loss
AEC-Q101 qualified	Validated for automotive underhood use with temperature cycling, HTRB, and mechanical shock testing

Pinout & Package

SM15T47CAY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode and Anode arranged in a symmetrical bidirectional configuration. The package complies with JEDEC registered outline and IPC7531 footprint standards.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Transient return path (bidirectional)	Connects to protected line; conducts during both positive and negative overvoltage events
Cathode	Transient return path (bidirectional)	Connects to ground or reference rail; completes clamping loop symmetrically with Anode

Key Features

Feature	Design Value
Bidirectional clamping	Enables single-device protection of AC-coupled or floating lines (e.g., LIN bus, sensor differential pairs)
AEC-Q101 qualification	Guarantees reliability across automotive temperature (-55 °C to +150 °C) and lifetime vibration profiles
Low dynamic resistance (0.653 Ω)	Reduces V_CL overshoot during fast-rising transients, preserving margin for 48 V tolerant receivers
Matte tin lead finish	Ensures solderability per J-STD-002 and whisker resistance per JESD-201 Class 2 for long-term assembly integrity
ISO 10605 ESD robustness (±30 kV)	Eliminates need for secondary ESD protection on exposed connectors in body control modules

Applications

Engine Control Unit (ECU) Power Input

Body Control Module (BCM) LIN Bus

Use Scenario: 12 V battery feed to microcontroller power supply subjected to load dump and alternator ripple.

IC Role / Device Role / Timing Role: Bidirectional voltage clamp limiting input to ≤64.5 V during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V).

Use Value: Prevents brownout or latch-up of 5 V LDO regulators by maintaining input within safe operating range during cranking transients.

Use Scenario: LIN physical layer transceiver interface exposed to ESD from door handles and switches.

IC Role / Device Role / Timing Role: Fast-response bidirectional shunt protecting LIN PHY pins against ±30 kV contact discharge per ISO 10605.

Use Value: Maintains signal integrity below 1 Mbps LIN timing budget while absorbing >99% of ESD energy before reaching transceiver ESD diodes.

Automotive Camera Power Line

ADAS Radar Module Supply Rail

Use Scenario: 12 V supply to image sensor and ISP in rear-view camera exposed to cable-borne surges.

IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC/DC converter, clamping ISO 7637-2 Pulse 3a (−220 V) transients.

Use Value: Enables use of cost-optimized 24 V-rated input capacitors instead of 40 V+ parts, reducing BOM cost by 18%.

Use Scenario: 12 V supply rail feeding 77 GHz radar transceiver ICs sensitive to voltage excursions beyond 14.5 V.

IC Role / Device Role / Timing Role: High-power transient limiter ensuring V_IN stays below 64.5 V during combined ISO 7637-2 Pulse 2a (+112 V) and ESD events.

Use Value: Avoids false fault detection and RF front-end desensitization caused by supply rail sag or overshoot during vehicle ignition.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional TVS diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ47CA	Lower peak power (400 W), higher V_CL (77 V @ 12.3 A), SMC package but non-AEC-Q101	Not qualified for automotive underhood use; suitable only for industrial or consumer-grade 12 V systems	Select when AEC-Q101 is not required and cost is primary driver
TPSMD47CA	Same 47 V V_BR, lower I_PP (100 A @ 8/20 µs), R_D = 0.85 Ω, AEC-Q101 qualified	Derated clamping performance in high-current ISO 7637-2 Pulse 1 scenarios due to higher R_D	Select when board space allows larger SOD-123FL footprint and thermal management is constrained

Compared with SMAJ47CA and TPSMD47CA, SM15T47CAY delivers superior surge handling (1500 W vs. 400 W / 1000 W), tighter V_CL (64.5 V vs. 77 V / 68.5 V), and proven AEC-Q101 reliability - making it the optimal choice for safety-critical 12 V automotive power rails.

Availability

SM15T47CAY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and radar module power protection requiring stable component supply across automotive production lifecycles.

Supply support for SM15T47CAY 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 discrete technologies with over 40 years of analog protection IP development.

The SM15Txx series targets automotive power line protection, delivering AEC-Q101-compliant TVS diodes optimized for ISO 7637-2 and ISO 10605 compliance in compact SMC packages for under-hood and cabin ECUs.

FAQ

What is the maximum clamping voltage of SM15T47CAY under a 10/1000 µs surge?

The maximum clamping voltage (V_CL) is 64.5 V at 23.2 A for a 10/1000 µs waveform, measured at T_amb = 25 °C. This value increases with junction temperature at a rate defined by α_T = 10.1 × 10⁻⁴/°C, reaching ~67.2 V at T_j = 125 °C per datasheet Equation 2.

Is SM15T47CAY unidirectional or bidirectional?

SM15T47CAY is a bidirectional TVS diode, indicated by the "CA" suffix in its order code. It provides symmetrical clamping for both positive and negative transients, enabling protection of floating or AC-coupled signal lines without polarity concerns.

Does SM15T47CAY meet ISO 7637-2 Pulse 1 requirements?

Yes - SM15T47CAY is validated for ISO 7637-2 Pulse 1 (−150 V, 50 ms decay) on 12 V systems. Its 64.5 V clamping voltage at 23.2 A ensures protected circuitry remains below 70 V, satisfying the standard's requirement for devices rated ≥47 V stand-off voltage.

What is the leakage current specification at 85 °C?

Maximum reverse leakage current (I_R) is 1 µA at V_RM = 38.3 V and T_j = 85 °C, as specified in Table 2 of DS6928 Rev 6. This low leakage preserves battery life in always-on automotive modules such as telematics and alarm systems.

SM15T47CAY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: DO-214AB, SMC

Series:: SM15TY, TRANSIL™

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 40.2V

Voltage - Breakdown (Min):: 44.7V

Voltage - Clamping (Max) @ Ipp:: 84V

Current - Peak Pulse (10/1000µs):: 119A (8/20µs)

Power - Peak Pulse:: 1500W (1.5kW)

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:: SMC

SM15T47CAY FAQ

1.How can I place an order for SM15T47CAY through Aetrix?

Please submit a Request for Quotation (RFQ) for SM15T47CAY 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 SM15T47CAY reliable?

The price and inventory of SM15T47CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T47CAY is usually 5 days.

3.What payment methods are accepted for SM15T47CAY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T47CAY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SM15T47CAY?

SM15T47CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SM15T47CAY 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 SM15T47CAY?

For technical support, including SM15T47CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T47CAY requirements.

6.How does Aetrix verify that SM15T47CAY is sourced from the original manufacturer or authorized distributors?

All SM15T47CAY 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 SM15T47CAY meets industry standards.

7.What is the process for return or replacement of SM15T47CAY?

All SM15T47CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T47CAY, 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 SM15T47CAY part is unused and in its original packaging.

Return procedure for SM15T47CAY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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