Vishay General Semiconductor - Diodes Division SMA5J9.0CA-M3/61

Overview

SMA5J9.0CA-M3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 9.0 V stand-off voltage (V_WM), 10.0–11.1 V breakdown voltage (V_BR), 15.4 V clamping voltage (V_C) at 32.5 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to protect automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.

For engineers reviewing the SMA5J9.0CA-M3/61 datasheet, SMA5J9.0CA-M3/61 pinout, SMA5J9.0CA-M3/61 application, or SMA5J9.0CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, halogen-free RoHS compliance (M3 suffix), AEC-Q101 qualification readiness, junction temperature range (−55 °C to +150 °C), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.

Technical Context

This device operates as a voltage-clamped crowbar during transient events, leveraging an avalanche breakdown mechanism to divert surge current away from protected circuitry. Its bidirectional symmetry ensures identical electrical characteristics in both polarities, with no polarity marking required on the SMA package.

Thermal performance is defined by R_θJA = 80 °C/W (typ.) and R_θJL = 25 °C/W (typ.), enabling reliable operation under repetitive surge conditions when mounted per recommended pad layout. The glass-passivated junction ensures stable leakage (<1.0 µA at V_WM) and fast response time (<1 ns).

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration; terminals solderable per J-STD-002 and JESD 22-B102.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMA5J9.0A-M3/61, the bidirectional SMA5J9.0CA-M3/61 eliminates polarity dependency and simplifies layout for AC-coupled or differential lines; versus SMB5J9.0CA-M3/61, it trades thermal margin for space efficiency in dense automotive and IoT modules.

Availability

SMA5J9.0CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, halogen-free compliance, and support for high-volume SMT production.

Supply support for SMA5J9.0CA-M3/61 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, power density, and automotive-grade qualification.

The SMA5J family was engineered for high-power-density transient suppression in space-constrained, thermally demanding applications - particularly targeting AEC-Q101-readiness, automated assembly compatibility, and robustness against repetitive surge stress.

FAQ

What does the "CA" suffix indicate in SMA5J9.0CA-M3/61?

The "CA" suffix denotes a bidirectional configuration: SMA5J9.0CA-M3/61 provides symmetrical clamping in both polarities, with identical V_BR, V_C, and I_PPM characteristics regardless of voltage polarity. This eliminates the need for polarity awareness during placement and enables protection of AC signals, differential buses, or floating nodes - unlike unidirectional variants such as SMA5J9.0A-M3/61 which require correct cathode orientation.

Is SMA5J9.0CA-M3/61 qualified to AEC-Q101?

SMA5J9.0CA-M3/61 itself is the commercial-grade halogen-free variant; however, the identical die and construction are used in AEC-Q101-qualified versions identified by the HM3 suffix (e.g., SMA5J9.0CAHM3_A/H). The M3 suffix confirms RoHS compliance and halogen-free materials, while AEC-Q101 qualification requires the HM3 ordering code and associated test documentation - both share the same electrical and thermal specifications.

What is the maximum clamping voltage of SMA5J9.0CA-M3/61 under surge conditions?

The maximum clamping voltage (V_C) of SMA5J9.0CA-M3/61 is 15.4 V, measured at its rated peak pulse current of 32.5 A using the standardized 10/1000 µs waveform. This value represents the worst-case voltage imposed on protected circuitry during a full 500 W transient event and is guaranteed across the operating temperature range of −55 °C to +150 °C.

Can SMA5J9.0CA-M3/61 be used in place of SMA5J9.0A-M3/61?

No - SMA5J9.0CA-M3/61 and SMA5J9.0A-M3/61 are functionally distinct: the "CA" version is bidirectional with no polarity marking, while the "A" version is unidirectional and requires correct cathode alignment. Substituting one for the other risks ineffective protection on reverse-polarity transients or unintended forward conduction. Layout, schematic symbol, and BOM must reflect the intended polarity architecture.

What PCB pad layout is recommended for optimal thermal performance of SMA5J9.0CA-M3/61?

Vishay specifies mounting SMA5J9.0CA-M3/61 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 500 W pulse power. Smaller pads increase thermal resistance and reduce surge capability - for example, halving pad area may derate PPPM by >20%. The recommended layout is documented in the datasheet's mechanical drawings and must be followed to ensure R_θJA = 80 °C/W (typ.) and avoid premature thermal failure during repetitive surges.