Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics SM4T7V6CAY

Name: SM4T7V6CAY
Brand: STMicroelectronics
SKU: SM4T7V6CAY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SM4T7V6CAY

Manufacturer:: STMicroelectronics

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SM4T7V6CAY.pdf

Description:: TVS DIODE 6.5VWM 14.5VC SMA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:661

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SM4T7V6CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode designed for ISO 7637-2 pulse protection in 12 V battery systems. It features a 7.6 V stand-off voltage (VRM), 11.2 V clamping voltage (VCL) at 35.7 A (10/1000 µs), 400 W peak pulse power, and AEC-Q101 qualification - deployed in engine control units to safeguard CAN transceivers against load dump and inductive switching surges.

For engineers reviewing the SM4T7V6CAY datasheet, SM4T7V6CAY pinout, SM4T7V6CAY application, or SM4T7V6CAY equivalent, key selection criteria include bidirectional surge capability, low leakage (<0.2 µA @ 25 °C), junction temperature rating up to +150 °C, and SMA package compatibility with IPC 7531 footprint requirements for high-reliability automotive PCB layouts.

Technical Context

This TVS diode uses planar silicon technology to achieve stable breakdown behavior across -55 °C to +150 °C operating junction temperature, with dynamic resistance (RD) of 0.041 Ω enabling precise clamping under fast 8/20 µs transients. Its bidirectional configuration supports symmetrical surge suppression on differential signal lines without polarity dependency.

The device complies with ISO 10605 ESD testing (±30 kV air/contact discharge) and meets ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−200 V), and Pulse 3b (+150 V) waveforms - critical for protecting LIN, CAN FD, and sensor interfaces in modern vehicle ECUs.

Key Specifications

Parameter	Value and Actual Design Meaning
Stand-off Voltage (VRM)	7.6 V - maximum continuous reverse working voltage before conduction begins; sets minimum system operating margin above 12 V nominal battery rail.
Breakdown Voltage (VBR)	7.2–8.0 V @ IBR = 1 mA - tight tolerance ensures predictable turn-on during transients; typ. 7.58 V at 25 °C.
Clamping Voltage (VCL)	11.2 V @ IPP = 35.7 A (10/1000 µs) - limits downstream IC voltage stress during surge events; enables robust interface protection.
Peak Pulse Power (PPP)	400 W @ 10/1000 µs - sustains energy-limited surges typical of automotive load dump and alternator ripple.
Leakage Current (IRM)	≤0.2 µA @ VRM = 7.6 V, 25 °C - minimizes standby power loss and avoids false triggering in low-current sensor circuits.
Junction Temperature Range	−55 °C to +150 °C - supports operation in under-hood environments including near exhaust manifolds and transmission control modules.

Pinout & Package

SM4T7V6CAY is housed in an industry-standard SMA (DO-214AC) surface-mount package per JEDEC MS-013, with cathode band marking and IPC 7531-compliant footprint. The two-terminal device has no polarity-sensitive pin numbering; terminals are designated Anode and Cathode for bidirectional operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Surge current entry point (negative transients)	Accepts reverse-polarity pulses (e.g., ISO 7637-2 Pulse 1, −150 V); forms low-impedance path to ground when V_AK < −V_BR.
Cathode	Surge current entry point (positive transients)	Accepts positive surges (e.g., Pulse 2a, +112 V); conducts when V_KA > +V_BR, clamping line-to-line voltage.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive use per stress test conditions including HTOL, TCT, and ESD - required for ECU, ADAS, and body control module deployment.
Bidirectional surge suppression	Single-device protection of differential buses (e.g., CAN H/L) without external polarity routing; eliminates need for dual unidirectional TVS placement.
Low dynamic resistance (RD)	0.041 Ω - reduces clamping voltage overshoot during fast 8/20 µs transients, improving protection margin for 5 V tolerant receivers.
UL94 V0 resin encapsulation	Flame-retardant molding compound - satisfies automotive cabin and under-hood flammability requirements per FMVSS 302.

Applications

Engine Control Unit (ECU)

CAN FD Interface Protection

Use Scenario: Installed across battery feed and ground in power supply input stage of gasoline/diesel engine controllers.

IC Role / Device Role / Timing Role: Primary overvoltage clamp during alternator load dump (ISO 7637-2 Pulse 5a) and relay coil flyback.

Use Value: Limits transient voltage to ≤11.2 V, preventing damage to 5 V LDO regulators and microcontroller I/O pins rated for 6 V absolute max.

Use Scenario: Placed differentially between CAN_H and CAN_L lines in high-speed automotive networks.

IC Role / Device Role / Timing Role: Bidirectional ESD and surge suppressor compliant with ISO 11898-2 and SAE J2962-1.

Use Value: Maintains signal integrity by clamping ±30 kV ESD events within 1 ns, with <1 pF junction capacitance preserving >5 Mbps bit rate.

Body Control Module (BCM)

Occupant Detection Sensor Interface

Use Scenario: Mounted on LIN bus lines connecting door modules, lighting controls, and seat position sensors.

IC Role / Device Role / Timing Role: Transient protector for LIN transceivers exposed to battery disconnection spikes (ISO 7637-2 Pulse 3b).

Use Value: Withstands +150 V pulses while drawing <0.2 µA leakage, avoiding interference with 12 V LIN master biasing circuitry.

Use Scenario: Integrated into capacitive seat occupancy detection analog front-end (AFE) inputs.

IC Role / Device Role / Timing Role: Low-leakage overvoltage guard for high-impedance sensing nodes vulnerable to ESD coupling.

Use Value: Delivers <0.2 µA IRM at 25 °C and 7.6 V VRM, ensuring minimal offset error in sub-µA current measurement paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ7.0CA	Higher VBR min (6.7 V), higher VCL (12.0 V @ 33.3 A), same SMA package	Marginally lower clamping performance; less suitable for 5 V receiver protection where headroom is constrained	Select when legacy design validation exists and 12.0 V clamping is acceptable for downstream 6 V tolerant ICs
1.5KE7.5CA	Higher PPP (1500 W), axial DO-15 package, slower response due to higher parasitic inductance	Not suitable for high-frequency CAN/LIN; incompatible with automated SMT assembly and space-constrained PCBs	Choose only for non-automotive industrial retrofit where board real estate and throughput are secondary to cost

Compared with SMAJ7.0CA and 1.5KE7.5CA, SM4T7V6CAY delivers tighter VBR tolerance, lower clamping voltage, and AEC-Q101 compliance - making it the preferred choice for new automotive designs requiring SMT scalability, thermal robustness, and ESD immunity in compact footprints.

Availability

SM4T7V6CAY is available at Aetrix Electronics and suitable for engine control units, CAN FD networks, body control modules, and occupant detection systems requiring stable component supply across multi-year automotive production cycles.

Supply support for SM4T7V6CAY 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.

SM4T7V6CAY belongs to the SM4TY series of AEC-Q101-qualified TVS diodes engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V automotive electrical architectures.

FAQ

What is the polarity configuration of SM4T7V6CAY?

SM4T7V6CAY is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without requiring orientation during placement. Its marking "DBCY" identifies the bidirectional variant, and it functions identically whether installed with anode or cathode toward the protected line - ideal for differential bus protection like CAN_H/CAN_L.

Does SM4T7V6CAY meet automotive ESD standards?

Yes - SM4T7V6CAY is certified to ISO 10605 with ±30 kV air and contact discharge performance using both 150 pF/330 Ω and 330 pF/330 Ω test networks. This exceeds standard automotive ESD immunity requirements for infotainment, telematics, and sensor interfaces, and is validated across its full operating temperature range (−55 °C to +150 °C).

Can SM4T7V6CAY replace SM4T7V6AY in existing designs?

No - SM4T7V6AY is unidirectional and must be oriented with cathode toward the protected line, whereas SM4T7V6CAY is bidirectional and polarity-agnostic. Substitution requires layout review: unidirectional placement cannot be reused, and clamping behavior differs under negative transients. Use only if the application explicitly requires bidirectional protection.

What is the thermal resistance of SM4T7V6CAY in standard FR4 PCB layout?

On a standard epoxy FR4 board with 70 µm copper thickness and recommended SMA footprint, SM4T7V6CAY exhibits R_th(j-a) ≈ 120 °C/W for a single pulse. Thermal impedance drops to ~30 °C/W at 1 ms pulse duration, enabling effective heat dissipation during short-duration surges like ISO 7637-2 pulses without exceeding 150 °C junction limit.

SM4T7V6CAY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: DO-214AC, SMA

Series:: SM4TY, TRANSIL™

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 6.5V

Voltage - Breakdown (Min):: 7.2V

Voltage - Clamping (Max) @ Ipp:: 14.5V

Current - Peak Pulse (10/1000µs):: 160A (8/20µs)

Power - Peak Pulse:: 400W

Power Line Protection:: No

Applications:: -

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

SM4T7V6CAY FAQ

1.How can I place an order for SM4T7V6CAY through Aetrix?

Please submit a Request for Quotation (RFQ) for SM4T7V6CAY 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 SM4T7V6CAY reliable?

The price and inventory of SM4T7V6CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM4T7V6CAY is usually 5 days.

3.What payment methods are accepted for SM4T7V6CAY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM4T7V6CAY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SM4T7V6CAY?

SM4T7V6CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SM4T7V6CAY 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 SM4T7V6CAY?

For technical support, including SM4T7V6CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM4T7V6CAY requirements.

6.How does Aetrix verify that SM4T7V6CAY is sourced from the original manufacturer or authorized distributors?

All SM4T7V6CAY 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 SM4T7V6CAY meets industry standards.

7.What is the process for return or replacement of SM4T7V6CAY?

All SM4T7V6CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM4T7V6CAY, 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 SM4T7V6CAY part is unused and in its original packaging.

Return procedure for SM4T7V6CAY:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…