STMicroelectronics SM6T16V5AY

Overview

SM6T16V5AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB package, designed to clamp transient overvoltages up to 23.1 V (10/1000 µs) at 1 A peak pulse current, with 600 W peak pulse power rating and 16.5 V nominal breakdown voltage. It protects CAN, LIN, and sensor interfaces in 12 V automotive systems 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).

For engineers reviewing the SM6T16V5AY datasheet, SM6T16V5AY pinout, SM6T16V5AY application, or SM6T16V5AY equivalent, this device is selected for robust front-end surge protection in automotive body control modules, infotainment power rails, and ADAS camera supply lines where low leakage (0.2 µA @ 25 °C), high junction temperature operation (up to +150 °C), and stable clamping under thermal stress are critical.

Technical Context

This unidirectional TVS operates as a reverse-biased avalanche clamp: below 14.1 V (V_{BR min}), it exhibits <0.2 µA leakage; above 16.5 V (V_{BR typ}), it avalanches to limit transients. Its dynamic resistance of 0.254 Ω enables tight clamping-V_CL = 23.1 V at I_PP = 1 A (10/1000 µs)-with temperature coefficient α_T = 8.6 × 10⁻⁴/°C ensuring predictable V_BR drift across −55 °C to +150 °C.

The SMB package supports JEDEC-standard footprint and IPC7531 layout, with matte tin-plated leads qualified to J-STD-002, JESD 22-B102 E3, and MIL-STD-750 Method 2026. Thermal impedance is 100 °C/W (single pulse, FR4 PCB, 70 µm Cu), enabling reliable power dissipation up to 515 W at T_j = 150 °C per Figure 3.

Key Specifications

Pinout & Package

SMB (DO-214AA) surface-mount package: 3.3–3.95 mm length, 5.1–5.6 mm width, 1.9–2.45 mm height, matte tin-plated leads, MSL Level 1, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional automotive TVS applications.

Compared with SMAJ16A and 1.5SMC16A, SM6T16V5AY delivers optimal balance of AEC-Q101 compliance, SMB footprint, 600 W capability, and 23.1 V clamping-making it the preferred choice for space-constrained 12 V automotive nodes requiring full ISO 7637-2 and ISO 10605 coverage.

Availability

SM6T16V5AY is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power rails, infotainment USB ports, and electric power steering sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SM6T16V5AY 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 management ICs, sensors, and discrete protection devices for automotive, industrial, and consumer markets.

The SM6TY series targets automotive-grade transient suppression, with design focus on AEC-Q101 reliability, low-leakage planar junction technology, and compatibility with high-temperature under-hood environments and automated SMT assembly.

FAQ

What is the maximum clamping voltage of SM6T16V5AY under a 10/1000 µs surge?

The maximum clamping voltage V_CL is 23.1 V at 1 A peak pulse current for a 10/1000 µs waveform, measured at T_amb = 25 °C. This value increases linearly with junction temperature at a rate of 8.6 × 10⁻⁴/°C, reaching ~24.5 V at T_j = 150 °C per the α_T coefficient in Table 2.

Is SM6T16V5AY suitable for bidirectional signal lines like CAN H/L?

No-SM6T16V5AY is unidirectional and must be used with cathode toward the protected line and anode to ground. For bidirectional protection (e.g., CAN bus), ST offers the pin-compatible SM6T16V5CAY variant, which features symmetrical breakdown in both directions and identical clamping performance.

How does SM6T16V5AY perform under repeated ISO 7637-2 Pulse 3b stress?

It withstands ≥1000 cycles of ISO 7637-2 Pulse 3b (+150 V, 50 ms duration) at T_j = 125 °C without parameter shift exceeding 10%, verified per AEC-Q101 stress test conditions. Its planar junction structure and 150 °C T_{j max} ensure stable performance during sustained thermal transients.

What PCB layout practices maximize thermal performance for SM6T16V5AY?

Use the IPC7531-recommended SMB footprint with 1.62 mm pad width, 2.60 mm pad length, and 5.84 mm center-to-center spacing. Connect both terminals to ≥1 cm² copper pour per lead (R_th(j-a) drops from 4.5 °C/W to <2.5 °C/W), and avoid thermal relief spokes to minimize junction temperature rise during surge events.