1SMC24AT3G - 1500W TVS Diode, 38.9V Clamp | Littelfuse
MPN： 1SMC24AT3G ✓ 啟用中1SMC24AT3G 概覽
A TVS diode, also called a transient-voltage suppressor, is a discrete semiconductor device that diverts surge energy through a deliberately nonlinear voltage-current characteristic. In the broader protection hierarchy, a TVS diode sits above or alongside fuse, MOV, and ESD-protection devices: it provides fast response and high surge capability while limiting the voltage reaching the protected circuit. The 1SMC24AT3G is used when a robust, high-energy surface-mount suppressor is preferred over lower-energy signal-line protection.
The key verified specifications are its 1500 W peak-power rating, 38.9 V clamp voltage, and 38.6 A peak pulse current. Littelfuse describes the SMC series as having excellent clamping capability, high surge capability, low Zener impedance, and fast response time. Its SMC package is suitable for automated PCB assembly and is intended for communication systems, automotive equipment, numerical controls, process controls, medical equipment, and business machines.
The device is unidirectional, so its cathode and anode orientation must be respected during layout and assembly. The clamp specification is a protection-related voltage limit under surge conditions, not the normal operating voltage of the protected rail. Designers should verify that the protected circuit remains within its absolute maximum voltage during the selected surge waveform. Because the available verified data does not provide the complete manufacturer parameter table, values such as reverse stand-off voltage, breakdown voltage, and thermal resistance are marked for data completion rather than guessed.
Typical implementation places the TVS diode close to the connector, power-entry point, or exposed interface conductor so surge current is diverted through a short, low-inductance path. The PCB copper area must be large enough to carry the transient current, while the protected trace and return path should remain physically separated from the surge-current loop. This is especially important in communication, automotive, industrial-control, and medical systems where an external transient can propagate through a cable or chassis connection.
This page synthesizes the verified distributor listing, manufacturer product description, cross-reference results, package information, and practical protection-layout guidance. It distinguishes confirmed values from unavailable electrical details so engineers can make a safe sourcing decision and cross-check the manufacturer datasheet before release to production.
直接替換替代品，適用於 1SMC24AT3G — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
1SMC24AT3
✅ 直接替換📋 參考替代品（不在目錄中）
SMCJ24A
✅ 直接替換📋 參考替代品（不在目錄中）
1SMB24AT3G
✅ 直接替換📋 參考替代品（不在目錄中）
1SMC24AT3G
✅ 直接替換聯絡詢價
查看資料表 →1SMC24AT3
✅ 直接替換📋 參考替代品（不在目錄中）
1SMC24AT3G 最大額定值與電氣特性
| Product Type | Unidirectional Zener transient-voltage suppressor |
| Peak Pulse Power | 1500 W |
| Clamp Voltage | 38.9 V |
| Peak Pulse Current | 38.6 A |
| Series | SMC |
| 封裝 | SMC surface-mount package |
| 安裝類型 | Surface Mount |
| Transient Protection Target | Voltage-sensitive components |
| Response Characteristic | Fast response time |
| Zener Impedance | Low Zener impedance |
| Clamping Capability | Excellent |
| Surge Capability | High surge capability |
| Polarity | Unidirectional |
1SMC24AT3G smc surface-mount package 腳位配置指南
1SMC24AT3G（smc surface-mount package 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： 1SMC24AT3G.
請參閱 資料表 以查看完整腳位配置。
典型應用
1SMC24AT3G 適用於 6 應用s: Communication Interface Protection, Automotive Electrical Protection, Industrial Control Equipment, Medical Equipment Input Protection, Business Machine and Data Equipment, Power and Control Rail Protection.
Communication Interface Protection
The 1SMC24AT3G fits communication-system transient protection because Littelfuse identifies the SMC series for protecting voltage-sensitive components from high-voltage, high-energy transients. Its 1500 W peak-power rating and 38.9 V clamp provide a defined surge-handling target for exposed lines. Place the device near the connector so surge current is diverted before it reaches sensitive interface circuitry. The 38.6 A Ipp specification must be checked against the actual pulse waveform, duration, and PCB thermal conditions.
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Automotive Electrical Protection
The Littelfuse 1SMC24AT3G is positioned for electrical protection in automotive systems, where load dump, switching, and inductive transients can exceed nominal component ratings. Its 1500 W peak-power capability is the verified value to compare against the vehicle surge requirement, while the 38.9 V clamp must remain acceptable to the protected circuit. A chassis or power-entry connection should use a short return path and adequate copper area. Automotive qualification status is not confirmed in the supplied data, so verify AEC-Q100 documentation before release.
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Industrial Control Equipment
The 1SMC24AT3G is suitable for industrial-control and process-control systems that connect external wiring to sensitive electronics. Littelfuse specifically identifies numerical controls and process controls as SMC-series application areas. The device should be installed at the boundary where field wiring enters the board, allowing the high-energy transient to be clamped before it propagates into control logic. The 1500 W rating is a pulse capability, not a continuous power rating, so thermal performance and repetitive-event limits require confirmation from the manufacturer datasheet.
推薦
Medical Equipment Input Protection
The Littelfuse product description names medical equipment among suitable SMC-series applications, making the 1SMC24AT3G a candidate for transient protection at external equipment interfaces. The device’s 38.9 V clamp can limit stress on downstream components when the normal interface voltage and system-level transient requirements permit it. Placement should be close to the connector or entry node, with a controlled surge-current return and no long unprotected trace. Medical regulatory certification is not established by the supplied data, so the design must separately verify safety and qualification requirements.
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Business Machine and Data Equipment
The 1SMC24AT3G can support transient protection in business machines and other data-processing equipment where external cables or power transients threaten sensitive electronics. The Littelfuse application description identifies business machines as an SMC-series use case. A 1500 W peak-pulse device provides a robust option for board-edge protection, but the selected device’s clamp voltage must remain below the absolute maximum rating of every protected part. Keep the TVS path close to the entry connector and avoid routing surge current through sensitive signal returns.
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Power and Control Rail Protection
The 1SMC24AT3G may be used to protect a power or control rail exposed to inductive or switching transients, provided the rail voltage and clamp specification are compatible. Its 38.9 V clamp is the verified protection value, while the protected circuit must tolerate that voltage during the specified surge event. Place the device across the rail at the physical source of the transient and provide a low-inductance return to the appropriate power or ground reference. Do not use the 1500 W peak rating as a substitute for continuous power-dissipation analysis.
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推薦產品摘要
工程參考資料，適用於 1SMC24AT3G — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 1SMC24AT3 | SMCJ24A | 1SMB24AT3G | 1SMC24AT3G | 1SMC24AT3 |
|---|---|---|---|---|---|---|
| Brand | Littelfuse | onsemi | Littelfuse | Littelfuse | onsemi | Littelfuse |
| Package | SMC | SMC | SMC | SMB | SMC | SMC |
| Surface Mount | Yes | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- High-energy surge capability (對比1SMC24AT3)
- Documented clamping specification (對比SMCJ24A)
- Application-oriented Littelfuse series (對比1SMB24AT3G)
設計說明
Place the TVS diode at the connector or power-entry boundary, as close as practical to the conductor that receives the transient. Route the discharge current through a short, wide copper path and provide a continuous return to the appropriate ground or chassis node. Avoid sharing a narrow trace with sensitive signal returns. The available data confirms SMC surface mounting but does not provide the land pattern, so use the Littelfuse package drawing for final footprint dimensions.
Treat the 1500 W value as a peak-pulse capability, not continuous dissipation. For any repetitive surge or elevated ambient-temperature design, estimate the average event energy, pulse duration, repetition rate, and PCB copper temperature rise using the manufacturer test conditions. The verified material does not provide thermal resistance or continuous power dissipation, so those values must be obtained from the datasheet before sizing the copper area.
Do not confuse the 38.9 V clamp voltage with reverse stand-off voltage, breakdown voltage, or the normal operating voltage of the protected rail. Confirm unidirectional polarity and the cathode orientation before assembly. Also verify that the protected component’s absolute maximum voltage remains above the clamp behavior under the actual surge waveform. The verified data does not establish the complete pinout, so consult the manufacturer drawing rather than guessing orientation.
合規資訊
The verified data identifies the Littelfuse product and application areas but does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Confirm these items from current Littelfuse documentation.
