Vishay General Semiconductor - Diodes Division SMA6J24A-E3/61

Overview

SMA6J24A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping inductive switching transients and lightning-induced surges. It features a 24 V stand-off voltage (V_WM), 26.7–29.5 V breakdown voltage (V_BR at I_T = 1 mA), 37.8 V maximum clamping voltage at 15.9 A (10/1000 μs), 600 W peak pulse power, and operates from –55 °C to +150 °C. It protects MOSFETs and signal lines in industrial sensor interfaces.

For engineers reviewing the SMA6J24A-E3/61 datasheet, SMA6J24A-E3/61 pinout, SMA6J24A-E3/61 application, or SMA6J24A-E3/61 equivalent, this page delivers verified electrical parameters, thermal resistance (R_θJA = 120 °C/W), polarity marking (cathode band), JEDEC-compliant MSL level 1 handling, and RoHS-compliant matte tin plating - all critical for surge protection layout and reliability validation.

Technical Context

This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds V_BR (26.7–29.5 V), limiting transient energy via low dynamic resistance (R_D = 0.523 Ω) and fast response (<1 ns). Its 10/1000 μs waveform rating of 600 W and 8/20 μs rating of 4000 W reflect dual-use capability across slower inductive spikes and faster lightning surges.

Thermal design relies on R_θJA = 120 °C/W (on standard PCB pads) and R_θJL = 25 °C/W, enabling sustained 4 W power dissipation at T_A = 50 °C. The device's V_BR temperature coefficient (α_T = 9.6 × 10⁻⁴/°C) allows accurate junction-voltage modeling across its full –55 to +150 °C operating range.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Cathode identified by color band. Molding compound meets UL 94 V-0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA6J24CA-E3/61 and SMCJ24A-E3/57T, the SMA6J24A-E3/61 offers optimal balance of compact SMA footprint, 600 W surge capacity, and precise 24 V system alignment - making it ideal for space-constrained industrial DC interfaces where unidirectional clamping suffices.

Availability

SMA6J24A-E3/61 is available at Aetrix Electronics and suitable for industrial sensor interfaces, 24 V DC power rail protection, and telecom line interface designs requiring stable component supply, consistent RoHS compliance, and traceable lot-level sourcing.

Supply support for SMA6J24A-E3/61 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and industrial-grade qualification.

The SMA6JxxA series was engineered specifically for surface-mount transient suppression in harsh environments - delivering high surge robustness, tight V_BR tolerance, and MSL level 1 process compatibility for automated manufacturing.

FAQ

What is the maximum clamping voltage of the SMA6J24A-E3/61 under a 10/1000 μs surge?

The SMA6J24A-E3/61 has a maximum clamping voltage (V_C) of 37.8 V at 15.9 A for a 10/1000 μs waveform. This value is measured per the standard test condition defined in the Vishay datasheet (document #89460, Rev. 09-Jan-2024) and reflects worst-case voltage seen by downstream circuitry during that surge profile. The SMA6J24A-E3/61 maintains this clamping performance across its rated temperature range.

Does the SMA6J24A-E3/61 support lead-free reflow soldering?

Yes, the SMA6J24A-E3/61 is qualified for lead-free reflow with a maximum peak temperature of 260 °C, meeting J-STD-020 MSL level 1 requirements. Its matte tin-plated terminals comply with J-STD-002 and JESD 22-B102 for solderability, and the E3 suffix confirms RoHS-compliant, industrial-grade construction. No pre-baking is required prior to assembly.

How does the breakdown voltage tolerance of the SMA6J24A-E3/61 affect circuit design?

The SMA6J24A-E3/61 specifies a breakdown voltage range of 26.7 V to 29.5 V at I_T = 1 mA. This ±5% tolerance requires designers to verify that the upper limit (29.5 V) remains safely below the absolute maximum voltage rating of protected components, while ensuring the lower limit (26.7 V) exceeds the system's normal operating voltage (24 V) by sufficient margin to prevent premature conduction. The SMA6J24A-E3/61's V_BR drift with temperature (α_T = 9.6 × 10⁻⁴/°C) must also be factored in for wide-temperature applications.

Can the SMA6J24A-E3/61 be used in bidirectional signal protection?

No - the SMA6J24A-E3/61 is strictly unidirectional and conducts only in forward bias above ~3.5 V; in reverse bias, it clamps above V_BR. For bidirectional protection (e.g., RS-485, CAN, AC-coupled lines), the bidirectional variant SMA6J24CA-E3/61 must be used. Using SMA6J24A-E3/61 on bidirectional signals risks forward conduction during negative excursions and incomplete clamping during positive transients.

What is the thermal resistance and how does it impact PCB layout for the SMA6J24A-E3/61?

The SMA6J24A-E3/61 has a typical junction-to-ambient thermal resistance (R_θJA) of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To maintain T_J ≤ 150 °C at 4 W dissipation (P_D at T_A = 50 °C), designers must provide at least this pad area and avoid excessive nearby heat sources. Reducing pad size increases R_θJA, risking thermal runaway during repeated surges. The SMA6J24A-E3/61's R_θJL = 25 °C/W further supports localized copper pour strategies.