SMBJ15CA-TR - 600W 15V Bidirectional TVS Diode | STMicroelectronics
部品番号: SMBJ15CA-TR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.46 | $0.46 |
| 10 | $0.39 | $3.90 |
| 100 | $0.27 | $27.00 |
| 500 | $0.21 | $105.00 |
| 1,000 | $0.17 | $170.00 |
SMBJ15CA-TR 概要
A TVS diode is a specialized clamping semiconductor placed in parallel with a sensitive load. Under normal operation it presents a high impedance, but when the line voltage exceeds its breakdown threshold it avalanches rapidly, diverting transient energy away from downstream circuitry. TVS diodes sit hierarchically within circuit protection components (TVS -> protection diode -> discrete semiconductor -> semiconductor). They are the fastest-responding overvoltage clamp available, with sub-nanosecond turn-on and the ability to absorb multi-kW pulses that would destroy Zener-based or MOV solutions.
Key specifications of the SMBJ15CA-TR include a 15 V working standoff voltage (VWM), 16.7 V minimum breakdown voltage (VBR), and a 25.1 A peak pulse current (IPP) at 10/1000 us. Clamping voltage (VC) is 24.4 V maximum at IPP, and leakage current at VWM is below 1 uA. The part is bidirectional (suffix "CA"), so the same orientation works for positive or negative-going transients. It is qualified to IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and MIL STD 883 method 3015 standards, fulfilling EMI/ESD immunity requirements for most electronics designs.
Typical applications include 12-15 V DC rail protection in PLCs and industrial sensors, USB/VBUS clamps, RS-485 and CAN bus transient suppression, secondary protection on telecom line cards, and automotive 12 V load-dump networks (when paired with a higher-rated companion). The SMB package provides a low thermal resistance path to the PCB copper pad, allowing the pulsed energy to be absorbed without degrading the die.
When laying out the SMBJ15CA-TR, keep the body as close to the protected connector or rail as possible and maximize the copper area on both pads to keep the clamp voltage low during high-current pulses. A nearby 1 nF-100 nF ceramic bypass capacitor suppresses residual high-frequency ringing.
ドロップイン代替品: SMBJ15CA-TR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: SMBJ15CA-TR （同一形状・フットプリント） — 相違点: Operating Temperature, RoHS Status, Series.
クイック比較ツール — 並列比較する代替部品を選択:
SMBJ15CA-TR
✅ ドロップイン✓ 在庫あり
$0.17 / 個
データシートを見る →SM6T15CA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SMBJ15CA
✅ ドロップイン✓ 在庫あり
$0.11 / 個
データシートを見る →SMBJ15CA
✅ ドロップイン✓ 在庫あり
$0.11 / 個
データシートを見る →SMBJ15CA
✅ ドロップイン✓ 在庫あり
$0.11 / 個
データシートを見る →SMBJ15CA
✅ ドロップイン✓ 在庫あり
$0.11 / 個
データシートを見る →SMBJ15CA-E3/52T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SMBJ15CA-TR 最大定格＆電気的特性
| Series | SMBJ / TRANSIL |
| Type | Bidirectional TVS (Transil) |
| Peak Pulse Power (10/1000 us) | 600 W |
| Working Standoff Voltage (VWM) | 15 V |
| Breakdown Voltage (VBR) min | 16.7 V |
| Breakdown Voltage (VBR) max | 18.5 V |
| Clamping Voltage (VC) max at IPP | 24.4 V |
| Peak Pulse Current (IPP) | 25.1 A |
| パッケージ | DO-214AA (SMB) |
| 実装タイプ | Surface Mount |
| ピン数 | 2 |
| 動作温度 | -55C to +150C |
| ESD Protection (IEC 61000-4-2) | Compliant |
| EFT Protection (IEC 61000-4-4) | Compliant |
| RoHS ステータス | Compliant (ECOPACK) |
SMBJ15CA-TR ピン構成
| ピン 1 | Terminal 1 (cathode bar) — Bidirectional - electrically identical to pin 2 in operation |
| ピン 2 | Terminal 2 (anode) — Bidirectional - electrically identical to pin 1 in operation |
主な用途
SMBJ15CA-TR の用途: 6 件s: 12 V Industrial DC Rail Protection, RS-485 / CAN Bus Transient Suppression, USB VBUS and Data Line Protection, Automotive 12 V Accessory Rail Protection, Telecom Line Card Secondary Protection, Industrial Sensor I/O Protection.
12 V Industrial DC Rail Protection
The SMBJ15CA-TR is well suited for protecting 12 V industrial power rails from inductive kickback and surge transients. Placed directly across the DC output of a 12 V switching converter or PLC input terminal, its 15 V working standoff accommodates nominal 12 V plus allowable ripple, while the 24.4 V clamp at 25.1 A holds transients below the 30 V abs-max of common 24 V-tolerant downstream ICs. The 600 W peak pulse capability (10/1000 us) absorbs the energy from contactor or relay coil turn-off, which can otherwise inject hundreds of volts into low-voltage signal lines. The DO-214AA (SMB) package dissipates the pulsed energy through PCB copper pads, enabling compact, low-profile protection without a heatsink.
おすすめ
RS-485 / CAN Bus Transient Suppression
For RS-485 and CAN bus interfaces exposed to outdoor or factory cabling, the SMBJ15CA-TR provides bidirectional overvoltage clamping on each data line. Its bidirectional construction eliminates orientation errors during PCB assembly, while the 24.4 V clamp voltage stays below the 26 V transceiver abs-max. The sub-nanosecond response time of the TRANSIL junction catches fast ESD and EFT events before they propagate into the transceiver, and the part's IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) compliance supports the certification requirements of most industrial communication standards. Place one SMBJ15CA-TR per signal pair near the bus connector for best protection.
おすすめ
USB VBUS and Data Line Protection
The SMBJ15CA-TR clamps USB VBUS and data-line transients to 24.4 V max, well below the 30 V abs-max of common USB controllers. At its 25.1 A peak pulse current, it absorbs hot-plug arcs and charger-fault overvoltages that would otherwise latch up or destroy downstream PMICs. The bidirectional rating is ideal for differential data lines (D+/D-), where it suppresses both positive and negative ESD events symmetrically. Using one SMBJ15CA-TR on VBUS and one on the data pair provides a complete IEC 61000-4-2 compliant protection scheme in the compact DO-214AA footprint, fitting easily behind a USB Type-C connector.
おすすめ
Automotive 12 V Accessory Rail Protection
Inside automotive infotainment and body-electronics modules, the SMBJ15CA-TR protects 12 V accessory rails from load-dump and jump-start transients up to its 600 W / 10/1000 us rating. Bidirectional polarity works for both positive and negative-going spike events. While the part is not specifically AEC-Q100 qualified, it is widely used in non-safety automotive subsystems where 12 V nominal operation must be hardened against alternator transients and reverse-battery faults (when paired with a series Schottky). Its SMB package and tape-and-reel packaging suit high-volume automotive ECU assembly lines.
おすすめ
Telecom Line Card Secondary Protection
In telecom line-interface cards, the SMBJ15CA-TR acts as a secondary protection TVS behind the primary gas-discharge tube (GDT) and PTC thermistor. Its fast turn-on characteristic closes the protection gap that slower primary protectors leave open during the first few microseconds of a surge event. The 24.4 V clamping voltage is safe for -48 V feed interfaces operating through a current-limited bridge, and the 25.1 A peak pulse current matches typical surge test waveforms used in GR-1089 core specifications. The SMB package size allows multi-channel protection density on the line-interface PCB.
おすすめ
Industrial Sensor I/O Protection
The SMBJ15CA-TR shields analog and digital sensor I/O lines from the ESD and surge events that occur when long cable runs are exposed to motor switching, lightning-induced ground potential rise, or operator contact. Mounted within 5 mm of the sensor connector, its 24.4 V clamp holds the line within the 26 V abs-max of typical 4-20 mA loop transmitters and 0-10 V analog front ends. The bidirectional TRANSIL structure is especially valuable for differential sensor pairs (RTD, thermocouple, strain gauge bridges) where polarity can be ambiguous. Combined with a small series resistor for current limiting, it forms a robust IEC 61000-4-2/4-4 compliant input protection network.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SMBJ15CA-TR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SMBJ15CA (Littelfuse) | SMBJ15CA (Microchip) | SMBJ15CA (SMC) | SMBJ15CA-E3/52T (Vishay) |
|---|---|---|---|---|---|
| Package | DO-214AA (SMB) | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same |
| Brand | STMicroelectronics | Littelfuse | Microchip Technology | SMC Diode Solutions | Vishay Intertechnology |
| Working Standoff Voltage (VWM) | 15 V | 15 V | 15 V | 15 V | 15 V |
| Clamping Voltage (VC) max | 24.4 V | 24.4 V | 24.4 V | 24.4 V | 24.4 V |
| Peak Pulse Power (10/1000 us) | 600 W | 600 W | 600 W | 600 W | 600 W |
| Polarity | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
主な差別化要因
- Highest cross-brand availability with identical ratings （vs SMBJ15CA (Littelfuse, Microchip, SMC, Vishay))
- Slightly higher peak pulse current （vs SMBJ15CA (Littelfuse 24.6 A))
- Wide distributor stock at active lifecycle （vs SMBJ15CA-E3/52T (Vishay))
設計ノート
Mount the SMBJ15CA-TR within 5 mm of the protected connector or IC pin. The DO-214AA leads have approximately 1 nH of parasitic inductance per millimeter of trace, and at 25 A peak current this translates to several volts of additional overshoot during the first nanoseconds of a transient. Keep both pads connected to wide copper pours (minimum 100 mm^2 per pad) to absorb the 600 W pulsed energy without overheating. Estimated: trace inductance at 5 mm is ~5 nH, contributing ~25 V/L di/dt overshoot during a 1 ns edge.
The SMBJ15CA-TR's 600 W peak pulse rating only applies to short transients (10/1000 us). For sustained overvoltage conditions, the steady-state power dissipation is limited by the thermal resistance from junction to ambient (approximately 30-40 C/W on a standard FR-4 PCB). Use the derating curve in the ST datasheet to determine continuous power handling; in practice, keep DC dissipation below 1 W per part unless substantial copper cooling is added.
Do not place the SMBJ15CA-TR in series with the protected line - it must always be in parallel (shunt across the line). A common engineering error is to use a bidirectional TVS on a DC rail that sees sustained overvoltage, which can overheat the die; ensure the working voltage stays at or below 15 V DC under all operating conditions including battery charging transients and fault scenarios.
For high-speed data lines such as USB 3.0 or HDMI, the SMBJ15CA-TR's junction capacitance (typically several hundred pF for a 600 W TVS of this voltage) can degrade signal integrity above 100 MHz. For such applications, consider a lower-capacitance dedicated ESD array; the SMBJ15CA-TR is best reserved for DC power and slower industrial interfaces like RS-485 and CAN where its capacitance is acceptable.
コンプライアンス情報
ST ECOPACK2 compliant per ST product page. Standard SMBJ series is not AEC-Q100 qualified - check ST's automotive-grade SMA/SMB variants if automotive qualification is required.
