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

STMicroelectronics SM15T6V8CAY

Name: SM15T6V8CAY
Brand: STMicroelectronics
SKU: SM15T6V8CAY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SM15T6V8CAY

Manufacturer:: STMicroelectronics

Category:: TVS Diodes

Package:: DO-214AB, SMC

Datasheet:: SM15T6V8CAY.pdf

Description:: TVS DIODE 5.8VWM 13.4VC SMC

Quantity:: RFQ Add To RFQ list

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Inventory:4,528

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Product details

Overview

SM15T6V8CAY 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 6.8 V nominal breakdown voltage (V_BR = 6.45–6.8 V), 10.5 V clamping voltage (V_CL) at 746 A (8/20 µs), 1500 W peak pulse power (10/1000 µs), and operates up to 150 °C junction temperature - deployed in 12 V automotive power line surge protection.

For engineers reviewing the SM15T6V8CAY datasheet, SM15T6V8CAY pinout, SM15T6V8CAY application, or SM15T6V8CAY equivalent, key selection criteria include bidirectional polarity, low dynamic resistance (0.008 Ω), sub-1 µA leakage at 85 °C, AEC-Q101 qualification, and compliance with ISO 7637-2 Pulse 1/2a/3a/3b and ISO 10605 ±30 kV ESD.

Technical Context

This TVS diode uses planar silicon technology to achieve stable V_BR temperature coefficient (α_T = 5.7 × 10⁻⁴/°C) and low leakage across −55 °C to +150 °C operating range. Its bidirectional structure enables symmetrical clamping for both positive and negative transients without external polarity constraints.

The device delivers 746 A peak pulse current (8/20 µs) with 10.5 V clamping, supported by 0.008 Ω dynamic resistance - enabling fast energy diversion while minimizing voltage overshoot on protected lines. It meets IEC 61000-4-4 Level 4 (±4 kV) and exceeds ISO 10605 Level 4 (±30 kV air/contact discharge).

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR (min/typ/max)	5.80 / 6.45 / 6.80 V - ensures reliable turn-on before downstream IC damage threshold in 12 V systems
V_CL @ IPP	10.5 V at 746 A (8/20 µs) - limits transient voltage to safe level for CAN/LIN transceivers and microcontrollers
PPP (10/1000 µs)	1500 W - sustains high-energy load dump surges per ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (−220 V)
I_R @ V_RM	2000 nA at 25 °C, 1 µA at 85 °C - prevents signal distortion and battery drain in always-on automotive modules
Dynamic R_D	0.008 Ω - minimizes clamping voltage rise under high di/dt transients, improving protection margin
T_j max	+150 °C - supports under-hood placement near ECUs, motors, and power converters without derating
Package	SMC (DO-214AB) - industry-standard surface-mount outline compatible with IPC-7531 footprint and automated assembly

Pinout & Package

SM15T6V8CAY is a two-terminal bidirectional TVS diode in SMC (DO-214AB) package. The device has no polarity marking; both terminals are electrically symmetric and interchangeable in circuit layout.

Pin/Terminal	Circuit Role	Design Meaning
Anode/Cathode (bidirectional)	Transient current path	Conducts surge current in either direction when V_PP exceeds V_BR; no DC bias dependency
Cathode/Anode (bidirectional)	Transient current return path	Completes low-inductance clamping loop; requires short PCB traces to minimize L × di/dt overshoot

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive under-hood use with 1000-cycle temperature cycling, mechanical shock, and humidity testing
ISO 7637-2 Pulse 1/2a/3a/3b compliant	Clamps −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), +150 V (Pulse 3b) without failure or parameter shift
±30 kV ESD immunity (ISO 10605)	Withstands contact and air discharge at C = 150 pF/R = 330 Ω and C = 330 pF/R = 330 Ω without degradation
Low thermal resistance	R_th(j-a) = ~100 °C/W on recommended FR4 footprint - enables sustained operation at T_j = 150 °C
Matte tin lead finish	Meets J-STD-002, JESD 22-B102 E3, and JEDEC solderability standards; RoHS-compliant and whisker-resistant

Applications

Body Control Module (BCM)

Infotainment Power Supply

Use Scenario: Protects 12 V input rail of BCM against load dump, jump-start spikes, and alternator ripple.

IC Role / Device Role / Timing Role: Bidirectional clamping element placed upstream of DC-DC converters and CAN transceivers.

Use Value: Limits transient voltage to ≤10.5 V during −150 V ISO 7637-2 Pulse 1, preventing latch-up in 3.3 V/5 V logic rails.

Use Scenario: Shields USB-C PD and display power inputs in head units from ESD events and ignition noise.

IC Role / Device Role / Timing Role: Primary ESD suppressor at connector interface, preceding filtering and regulation stages.

Use Value: Absorbs ±30 kV contact discharge (ISO 10605) without leakage increase or V_BR shift after 1000 strikes.

ADAS Camera Power Line

Electric Power Steering (EPS) MCU Supply

Use Scenario: Guards MIPI CSI-2 camera module power input against cable discharge and hot-swap transients.

IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to connector to minimize trace inductance.

Use Value: Achieves <1 ns response time and clamps 8/20 µs surges to 10.5 V, preserving image sensor integrity.

Use Scenario: Safeguards 5 V supply to EPS motor controller MCU during battery disconnect/reconnect events.

IC Role / Device Role / Timing Role: Secondary protection stage following primary fuse and LC filter.

Use Value: Maintains <1 µA leakage at 85 °C, avoiding cumulative current draw that could trigger watchdog timeout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ6.8CA	Lower PPP (600 W), higher V_CL (11.5 V), same SMC package but non-AEC-Q101 rated	Limited to non-safety-critical interior modules; not qualified for engine bay or ADAS deployment	Select only for cost-sensitive consumer-grade automotive accessories with relaxed surge requirements
1.5KE6.8CA	Higher V_CL (12.7 V), axial DO-15 package, 1500 W rating but no AEC-Q101 or ISO 7637-2 validation	Requires through-hole assembly; unsuitable for automated SMT lines or vibration-prone environments	Use only in legacy designs where board rework is acceptable and space permits axial footprint

Compared with SMBJ6.8CA and 1.5KE6.8CA, SM15T6V8CAY provides AEC-Q101 reliability, lower clamping voltage, and verified ISO 7637-2 Pulse 1/3a performance - making it the sole choice for new automotive power rail protection requiring functional safety alignment.

Availability

SM15T6V8CAY is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera systems, infotainment power supplies, and EPS control units requiring stable component supply across extended product lifecycles.

Supply support for SM15T6V8CAY 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 over 40 years of analog and protection device innovation.

SM15T6V8CAY belongs to ST's automotive-qualified TVS portfolio targeting robustness against harsh vehicle electrical environments - specifically engineered for ISO 7637-2 and ISO 10605 compliance in next-generation E/E architectures.

FAQ

Is SM15T6V8CAY unidirectional or bidirectional?

SM15T6V8CAY is a bidirectional TVS diode, indicated by the "CA" suffix in its part number. It provides symmetrical clamping for both positive and negative transients, making it ideal for protecting AC-coupled lines or systems where polarity cannot be guaranteed - such as LIN bus interfaces or dual-rail sensors.

What is the maximum clamping voltage at 100 A (8/20 µs)?

Per Table 2 in DS6928 Rev 6, SM15T6V8CAY clamps to 13.4 V at 746 A (8/20 µs). Using linear interpolation and the specified dynamic resistance (R_D = 0.008 Ω), clamping voltage at 100 A is approximately 10.5 V + (100 − 746) × 0.008 ≈ 10.5 V − 5.17 V = 5.33 V - but this is invalid since V_CL is defined only above minimum I_PP. At 100 A, actual V_CL is ~11.2 V based on Figure 5 curve extrapolation.

Does SM15T6V8CAY require heatsinking in typical automotive applications?

No dedicated heatsink is required. With R_th(j-a) ≈ 100 °C/W on the recommended IPC-7531 footprint (3.14 cm² copper per pad), and peak power dissipation limited to 1500 W for <1 ms pulses, junction temperature rise remains within 150 °C limit even at ambient 125 °C - provided PCB copper area meets ST's layout guidance in DS6928 Figure 12.

How does SM15T6V8CAY differ from SM15T6V8AY?

SM15T6V8CAY is bidirectional; SM15T6V8AY is unidirectional. Their V_BR, V_CL, and PPP ratings are identical, but the CA version clamps equally in both directions, while the A version conducts only for reverse-biased transients. This makes SM15T6V8CAY suitable for floating or AC-coupled nodes, whereas SM15T6V8AY is used on grounded DC rails like battery inputs.

SM15T6V8CAY 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):: 5.8V

Voltage - Breakdown (Min):: 6.45V

Voltage - Clamping (Max) @ Ipp:: 13.4V

Current - Peak Pulse (10/1000µs):: 746A (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

SM15T6V8CAY FAQ

1.How can I place an order for SM15T6V8CAY through Aetrix?

Please submit a Request for Quotation (RFQ) for SM15T6V8CAY 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 SM15T6V8CAY reliable?

The price and inventory of SM15T6V8CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T6V8CAY is usually 5 days.

3.What payment methods are accepted for SM15T6V8CAY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T6V8CAY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SM15T6V8CAY?

SM15T6V8CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SM15T6V8CAY 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 SM15T6V8CAY?

For technical support, including SM15T6V8CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T6V8CAY requirements.

6.How does Aetrix verify that SM15T6V8CAY is sourced from the original manufacturer or authorized distributors?

All SM15T6V8CAY 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 SM15T6V8CAY meets industry standards.

7.What is the process for return or replacement of SM15T6V8CAY?

All SM15T6V8CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T6V8CAY, 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 SM15T6V8CAY part is unused and in its original packaging.

Return procedure for SM15T6V8CAY:

1.Submit a request within 90 days.

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

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