Diodes Incorporated SMBJ8.0CAQ-13-F

Overview

SMBJ8.0CAQ-13-F from Diodes Incorporated is a bi-directional 600W automotive transient voltage suppressor (TVS) diode designed for ISO7637-2 and ISO10605 surge/ESD protection in vehicle power-line and signal-line circuits. It features 8.0V reverse standoff voltage (VRWM), 9.83V maximum breakdown voltage (VBR), 13.6V clamping voltage at 44.1A peak pulse current (VC @ IPP), and AEC-Q101 qualification for under-hood applications.

For engineers reviewing the SMBJ8.0CAQ-13-F datasheet, SMBJ8.0CAQ-13-F pinout, SMBJ8.0CAQ-13-F application, or SMBJ8.0CAQ-13-F equivalent, this part is selected for robust bidirectional clamping in 12V automotive systems where compliance with Pulse 1 (–150V), Pulse 2a (+112V), Pulse 3a (–220V), and Pulse 3b (+150V) per ISO7637-2 is required.

Technical Context

This bi-directional TVS operates symmetrically across both polarities, enabling protection of differential or floating lines without polarity dependency. Its 1.0mA test current (IT) and ≤50µA reverse leakage at VRWM ensure low standby power loss in always-on vehicle modules.

The device uses silicon avalanche junction technology to achieve sub-nanosecond response time and stable clamping performance over –55°C to +175°C junction temperature range. Its 600W peak pulse power rating is validated per 10×1000µs waveform (Figure 4), with derating to 4.8W/°C above +25°C ambient.

Key Specifications

Pinout & Package

Package: SMB (Surface-Mount Small Outline), molded plastic body with UL 94V-0 flammability rating, 0.1g mass, moisture sensitivity level 1 (J-STD-020). Cathode band omitted - bi-directional symmetry confirmed by "C" suffix and absence of polarity marking per datasheet page 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bi-directional automotive TVS applications.

Compared with SMBJ8.0C.TCT-ND, SMBJ8.0CAQ-13-F delivers certified automotive reliability and supply-chain traceability; versus TPSM8.0CQ-13-F, it trades thermal headroom for compact SMB footprint-ideal for space-constrained ADAS and infotainment modules.

Availability

SMBJ8.0CAQ-13-F is available at Aetrix Electronics and suitable for automotive ECU power inputs, CAN bus protection, ADAS camera interfaces, and USB Type-C ports requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for SMBJ8.0CAQ-13-F 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

Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions, with design centers in Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.

The SMBJ series is engineered specifically for automotive-grade transient suppression, targeting ISO7637-2 and ISO10605 compliance in harsh-temperature environments with zero compromise on AEC-Q101 validation or PPAP readiness.

FAQ

What is the meaning of the "C" in SMBJ8.0CAQ-13-F?

The "C" suffix denotes bi-directional functionality, confirming symmetrical avalanche clamping behavior across both polarities. This eliminates polarity concerns during PCB layout and enables protection of floating or differential signal lines such as CAN, LIN, or USB without orientation constraints - verified in the Electrical Characteristics table (page 3) and Marking Information section (page 2).

Does SMBJ8.0CAQ-13-F meet ISO7637-2 Pulse 3b requirements?

Yes - the datasheet explicitly lists compliance with ISO7637-2 Pulse 3b (+150V) on page 1 under "Description and Applications." Its 13.6V clamping voltage at 44.1A ensures downstream circuitry remains below 16V during this fast-rising, high-energy pulse, satisfying OEM requirements for body electronics and infotainment power domains.

Can SMBJ8.0CAQ-13-F be used in place of a unidirectional SMBJ8.0AQ-13-F?

No - bi-directional and unidirectional variants have different internal structures and clamping characteristics. The unidirectional version conducts forward current during negative transients, while the bi-directional version clamps both polarities identically. Substitution requires circuit review: unidirectional parts require correct polarity orientation; bi-directional parts do not, but exhibit higher leakage at low reverse bias.

What is the maximum steady-state power dissipation at +100°C ambient?

Per Figure 6 (Steady-State Power Derating Curve), PM(AV) derates linearly from 5.0W at TL = +75°C. At +100°C case temperature, PM(AV) = 5.0W − (100 − 75) × 4.8W/°C = –70W - invalid. Instead, using ambient derating: from Figure 1, at TA = +100°C, derating is ~55% → 5.0W × 0.55 = 2.75W maximum continuous dissipation with proper PCB copper area and airflow.