1.5SMCJ54C - 1500W TVS Diode 54V Bidirectional SMC | Diotec
N.º da peça: 1.5SMCJ54C ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.42 | $0,42 |
| 10 | $0.36 | $3,60 |
| 100 | $0.28 | $28,00 |
| 500 | $0.22 | $110,00 |
| 1.000 | $0.18 | $180,00 |
| 3.000 | $0.14 | $420,00 |
1.5SMCJ54C Visão geral
What is a TVS diode? A transient voltage suppressor is a discrete semiconductor protection device that responds to over-voltage events in the nanosecond time domain by avalanching into a low-impedance state, shunting surge current away from sensitive downstream circuitry. TVS diodes sit within the broader hierarchy of discrete semiconductors (diodes -> protection devices -> TVS) and are commonly specified alongside metal-oxide varistors (MOVs) and gas discharge tubes (GDTs) as a second-tier clamp after primary over-current protection. The "C" suffix indicates bidirectional operation, meaning a single part protects both polarities of an AC or DC-coupled bus without orientation sensitivity.
Key features include a minimum breakdown voltage of 60.0 V and a maximum breakdown of 66.0 V at 1 mA, a maximum reverse leakage of 5 µA at the rated stand-off, a peak forward surge rating suited for the SMC footprint, and a glass-passivated junction rated for 150 °C junction temperature. The low-profile DO-214AB (SMC) body has Underwriters Laboratory Flammability Classification 94V-0 and supports 260 °C / 10 s high-temperature soldering for lead-free reflow compatibility.
Typical applications include 48 V PoE protection, telecom line-card secondary protection, industrial 24/48 V DC bus transient suppression, photovoltaic inverter input clamping, and DC motor drive H-bridge protection. Designers also use 1.5SMCJ54C series parts as secondary protection after a primary GDT or PTC to limit let-through energy.
When designing with this device, verify that the chosen working voltage (Vrwm = 54 V) sits above the maximum continuous operating voltage of the protected bus, and confirm that the peak-pulse power derating curve at the expected surge duration does not exceed 1500 W. Bidirectional parts require no orientation marking, simplifying PCB layout and rework.
Alternativas drop-in para 1.5SMCJ54C — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
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1.5SMCJ54CA
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1.5SMCJ54C
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Ver ficha técnica →1.5SMCJ54C
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SMCJ54CA
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1.5SMCJ54C Classificações máximas e características elétricas
| Peak Pulse Power (10/1000 us) | 1500 W |
| Working Stand-off Voltage (Vrwm) | 54 V |
| Breakdown Voltage Min (Vbr) | 60.0 V @ 1 mA |
| Breakdown Voltage Max (Vbr) | 66.0 V @ 1 mA |
| Reverse Leakage (Ir) | 5 uA max at Vrwm |
| Configuration | Bidirectional |
| Encapsulamento | DO-214AB (SMC) |
| Junction Type | Glass passivated |
| Maximum Junction Temperature | 150 C |
| Soldering Temperature | 260 C / 10 s |
| Flammability Rating | UL 94V-0 |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Contagem de pinos | 2 |
Configuração de pinos do 1.5SMCJ54C
| Pino 1 | Terminal 1 — Bidirectional TVS terminal 1 (electrically equivalent to terminal 2) |
| Pino 2 | Terminal 2 — Bidirectional TVS terminal 2 (electrically equivalent to terminal 1) |
Aplicações típicas
1.5SMCJ54C é adequado para 6 aplicaçãos: 48 V Telecom and PoE Protection, Industrial 24/48 V DC Bus Transient Suppression, Photovoltaic String Input Clamping, DC Motor Drive H-Bridge Protection, Secondary Clamp After GDT on Telecom Line Cards, Automotive 48 V Mild-Hybrid Bus Protection.
48 V Telecom and PoE Protection
The 1.5SMCJ54C protects 48 V telecom and PoE rails from secondary surges after the primary GDT/PTC stage. Its 60 V minimum breakdown sits well above the 48 V continuous operating voltage while clamping fast transients below the insulation rating of downstream ICs. Placed in parallel with the bus as a secondary clamp, it shunts 1500 W 10/1000 us surges to ground. The bidirectional SMC package simplifies PCB layout on polarity-agnostic RJ45/Ethernet interfaces and PoE+ powered devices.
Recomendado
Industrial 24/48 V DC Bus Transient Suppression
On factory-automation 24 V and 48 V DC buses, the 1.5SMCJ54C clamps inductive kick from solenoids, motor starters, and switching contactors. The 54 V working voltage matches the upper tolerance of 48 V industrial rails (which can rise to 55 V under load dumps), while the 1500 W peak pulse capability absorbs the energy of typical IEC 61000-4-2 / IEC 61373-4-5 surge events. The bidirectional configuration means a single part protects both polarities, and the DO-214AB footprint is compatible with automated pick-and-place assembly.
Recomendado
Photovoltaic String Input Clamping
The 1.5SMCJ54C protects photovoltaic inverter inputs from indirect lightning surges on long string cables. With a 54 V stand-off it is well-matched to 48 V PV module strings, and its 1500 W peak pulse power absorbs the bulk of indirect-lightning energy after the primary SPD at the combiner box. The bidirectional configuration handles both positive and negative transients on the floating PV string. The DO-214AB (SMC) body is rated UL 94V-0 and operates at 150 C junction, supporting sealed outdoor inverter enclosures with elevated ambient temperature.
Recomendado
DC Motor Drive H-Bridge Protection
In brushed and brushless DC motor drives, the 1.5SMCJ54C clamps back-EMF transients generated when the H-bridge switches off inductive armature current. The 54 V stand-off suits 48 V battery-powered drives (forklifts, e-bikes, robotics), while the 1500 W peak pulse handles the brief high-energy kick that exceeds the MOSFET avalanche rating. Placing the TVS directly across the motor terminals limits the let-through voltage and protects the upstream FETs. Bidirectional operation means a single part handles both motor-rotation polarities without PCB rework.
Recomendado
Secondary Clamp After GDT on Telecom Line Cards
Used as a secondary protection clamp downstream of a gas discharge tube (GDT) on telecom line cards, the 1.5SMCJ54C limits the residual let-through voltage to below 87 V during the GDT turn-on transient. Its nanosecond response time complements the slower microsecond turn-on of the GDT, catching the fast-edge overshoot that the GDT alone would pass through. The 1500 W 10/1000 us rating matches the energy of the residual pulse after primary GDT clipping. Bidirectional operation handles both tip-to-ring and ring-to-tip surge polarities on the two-wire line.
Recomendado
Automotive 48 V Mild-Hybrid Bus Protection
On mild-hybrid automotive 48 V power nets, the 1.5SMCJ54C clamps load-dump and jump-start transients that exceed the 54 V nominal bus voltage. Placed across the 48 V bus rails, it shunts 1500 W peak pulse energy to chassis ground and prevents damage to downstream DC-DC converters and 48 V ECU loads. The bidirectional configuration simplifies harness layout because the protected bus is polarity-sensitive in some architectures and bidirectional in others. Designers targeting AEC-Q100 should consider an automotive-qualified equivalent such as the Littelfuse SMCJ54CA series for ISO 7637-2 compliance.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para 1.5SMCJ54C — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 1.5SMCJ54CA | 1.5SMCJ54C (PanJit) | 1.5SMCJ54C (Won-Top) | 1.5SMCJ54C (Amtek) | SMCJ54CA (MCC) | SMCJ54CA (Littelfuse) |
|---|---|---|---|---|---|---|---|
| Brand | Diotec Semiconductor | Diotec Semiconductor | PanJit Semiconductor | Won-Top Electronics | Amtek Technology | Micro Commercial Components | Littelfuse |
| Package | DO-214AB (SMC) | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same |
| Working Stand-off Voltage (Vrwm) | 54 V | 54 V | 54 V | 54 V | 54 V | 54 V | 54 V |
| Breakdown Voltage Range (Vbr) | 60.0 V to 66.0 V @ 1 mA | 60.0 V to 66.0 V @ 1 mA | 60.0 V to 66.0 V @ 1 mA | 60.0 V to 66.0 V @ 1 mA | 60.0 V to 66.0 V @ 1 mA | 60.0 V to 66.0 V @ 1 mA | 60.0 V to 66.0 V @ 1 mA |
| Configuration | Bidirectional | Unidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| Peak Pulse Power (10/1000 us) | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W |
| Reverse Leakage (Ir) | 5 uA max | 5 uA max | 5 uA max | 5 uA max | 5 uA max | 5 uA max | 5 uA max |
| Junction Temperature | 150 C max | 150 C max | 150 C max | 150 C max | 150 C max | 150 C max | 150 C max |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- Broad cross-brand second-source availability in identical footprint (vs Single-supplier TVS parts)
- Bidirectional operation simplifies PCB assembly (vs Unidirectional TVS (1.5SMCJ54A))
- 1500 W peak pulse power covers IEC 61000-4-5 secondary-stage energy (vs Lower-power 400 W or 600 W SMA-packaged TVS)
Notas de projeto
The 1.5SMCJ54C is rated for 1500 W peak pulse power on the 10/1000 us waveform, but this rating must be derated for shorter pulses (8/20 us) and elevated ambient temperature. Estimated: at 25 C ambient the DO-214AB (SMC) thermal resistance (theta_JA) of approximately 50 C/W on a 1 oz copper pad allows roughly 2.5 W continuous dissipation; derate to 0 W at 150 C junction. For high-energy surge paths use a large copper pad under the SMC body to keep transient thermal impedance low.
Place the TVS as close as possible to the entry terminal or connector pin to minimize trace inductance between the surge entry point and the clamp. Use a wide, short ground return trace from the TVS to chassis or earth ground - every nanohenry of trace inductance adds voltage overshoot (V = L * di/dt) that can exceed the protected IC's absolute maximum rating. For 8/20 us lightning surges with di/dt of order 1 kA/us, even 10 nH traceability of 10 V overshoot can push a 60 V supplier near 70 V at the protected pin.
Do not select 1.5SMCJ54C if the protected line regularly operates above 50 V continuous. Reverse leakage will rise exponentially with junction temperature and may exceed the 5 uA datasheet limit, wasting power and shifting the clamping voltage. Also avoid using this part as a primary lightning protector - 1500 W is a secondary-clamp rating; primary lightning protection requires a GDT or spark gap with much higher surge current capability (typically 10-25 kA 8/20 us). Use 1.5SMCJ54C downstream of, not in place of, the primary SPD.
Informações de conformidade
RoHS and lead-free confirmed by Diotec product listing and Amtek datasheet. UL 94V-0 flammability rated per package datasheet. Commercial grade - not AEC-Q100 qualified; choose automotive-grade SMCJ54CA variant for vehicle applications.