STMicroelectronics SMA6T7V6CAY

Overview

SMA6T7V6CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMA (DO-214AC) package, designed to protect 12 V automotive electronics 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). It features 7.6 V nominal breakdown voltage (V_BR), 10.2 V max clamping voltage (V_CL) at 56 A (10/1000 µs), and 600 W peak pulse power rating.

For engineers reviewing the SMA6T7V6CAY datasheet, SMA6T7V6CAY pinout, SMA6T7V6CAY application, or SMA6T7V6CAY equivalent, this device is selected for robust overvoltage protection in CAN/LIN bus interfaces, body control modules, and infotainment power rails where low leakage (<1 µA @ 85 °C), AEC-Q101 qualification, and high junction temperature operation (T_j up to 150 °C) are mandatory.

Technical Context

This bidirectional TVS operates symmetrically across both polarities, with a dynamic resistance (R_D) of 0.040 Ω at 10/1000 µs surge, enabling precise clamping under fast transients. Its planar silicon construction ensures stable V_BR temperature coefficient (α_T = 6.1 × 10⁻⁴/°C) and low capacitance - critical for preserving signal integrity on high-speed automotive data lines.

The device complies with IEC 61000-4-4 Level 4 (4 kV), ISO 10605 (±30 kV), and ISO 7637-2 Pulse 1/2a/3a/3b waveforms. Its JEDEC DO-214AC package supports automated SMT assembly and meets J-STD-020 MSL Level 1, with matte tin lead finish and IPC7531-compliant footprint.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, single-diode configuration with cathode band marking. JEDEC registered outline; recommended footprint per DS6931 Figure 18 (5.43 mm × 2.63 mm pad pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA6T7V6AY, SMA6T7V6CAY eliminates need for dual-diode layouts in differential or floating circuits; versus SMCJ7.0CA, it trades peak power for compact SMA size and lower clamping voltage-critical for 12 V automotive electronics with tight voltage margins.

Availability

SMA6T7V6CAY is available at Aetrix Electronics and suitable for automotive body control modules, CAN/LIN network nodes, infotainment power supplies, and sensor interface circuits requiring stable component supply across extended temperature ranges and rigorous AEC-Q101 compliance.

Supply support for SMA6T7V6CAY 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

SMA6TY belongs to ST's Automotive Transil™ TVS family, engineered specifically to meet stringent ISO 7637-2 and ISO 10605 immunity requirements in modern vehicle ECUs-prioritizing low clamping voltage, AEC-Q101 reliability, and SMT manufacturability.

FAQ

What is the maximum clamping voltage of SMA6T7V6CAY under a 10/1000 µs surge?

The maximum clamping voltage is 10.2 V at 56 A for a 10/1000 µs waveform, measured at T_amb = 25 °C. This value increases with junction temperature per α_T = 6.1 × 10⁻⁴/°C, reaching ~11.1 V at T_j = 125 °C using the formula V_CL(T_j) = V_CL(25 °C) × [1 + α_T × (T_j − 25)].

Is SMA6T7V6CAY suitable for protecting CAN FD physical layer circuits?

Yes - its bidirectional symmetry, low dynamic resistance (0.040 Ω), and fast response (<1 ns) make it effective for CAN FD bus protection. With typical junction capacitance <100 pF at 0 V (inferred from SMA6T6V7CAY curve in DS6931 Figure 8), it introduces negligible signal distortion on 5 Mbps CAN FD lines when placed close to the connector.

How does the leakage current of SMA6T7V6CAY change with temperature?

Leakage rises exponentially with junction temperature: 20 µA at 25 °C, 50 µA at 85 °C, and ~200 µA at 125 °C (per DS6931 Figure 9 extrapolation). This remains well below 1 µA/V of standoff voltage, ensuring minimal impact on always-on circuits like smart junction boxes.

Can SMA6T7V6CAY replace SMA6T7V6AY in an existing design?

No - SMA6T7V6CAY is bidirectional while SMA6T7V6AY is unidirectional. Swapping requires verifying circuit topology: SMA6T7V6CAY protects floating or AC-coupled nodes (e.g., LIN bus), whereas SMA6T7V6AY only clamps positive transients to ground. Incorrect substitution may leave negative surges unclamped.