SMCJ45A-E3/57T - 1500W TVS Diode, 45V Standoff, Uni-Directional | Vishay
N.º da peça: SMCJ45A-E3/57T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.55 | $0,55 |
| 10 | $0.48 | $4,80 |
| 100 | $0.38 | $38,00 |
| 500 | $0.29 | $145,00 |
| 1.000 | $0.23 | $230,00 |
SMCJ45A-E3/57T Visão geral
A Transient Voltage Suppressor (TVS) is a semiconductor protection device designed to clamp fast over-voltage transients (ESD, lightning, inductive load switching) to a safe level, thereby protecting downstream components. TVS diodes operate in the avalanche-breakdown mode when the applied voltage exceeds their breakdown voltage, shunting transient current away from the protected circuit. The TVS belongs to the broader circuit-protection category alongside varistors (MOVs), surge protectors, and PTC resettable fuses, and sits below voltage regulators and power MOSFETs in the power-management hierarchy.
Key features include a glass-passivated chip junction for long-term reliability, low-profile DO-214AB (SMC) package ideal for automated placement, uni-directional polarity, built-in strain relief, low inductance, excellent clamping capability, fast response time (typically < 1 ps from 0 V to BV min), low reverse leakage at standoff, and a repetition-rate (duty cycle) of 0.05%. The series is RoHS compliant and lead-free.
Technically, the 1500 W P_PPM is measured at a 10/1000 µs exponential waveform per IEC 61000-4-5 / IEEE C62.41 surge standards. The DO-214AB (SMC) package has a typical thermal resistance of approximately 50 °C/W junction-to-ambient on a standard JEDEC test board, which is important when calculating steady-state power dissipation under repetitive surges.
Typical applications include DC power-line protection on 24 V industrial buses, automotive load-dump protection (with appropriate derating), telecom equipment surge protection, USB / HDMI port protection, and protection of microcontroller I/O pins in industrial PLCs. In all these use cases the 45 V standoff aligns with 24 V rails and 28 V avionics rails. For higher-voltage systems the SMCJ series includes variants up to 170 V standoff in the same footprint.
Design consideration: derate peak-pulse power for non-standard pulse widths. The 1500 W rating is specified on a 10/1000 µs waveform; shorter pulses (e.g. 8/20 µs lightning surges) must use the device's pulse-power curve, and longer pulses (e.g. 10/100 ms load-dump) must use the load-dump curve with substantially lower P_PPM. Always refer to the published derating curves in the manufacturer datasheet.
This page synthesizes distributor pricing, drop-in pin-equivalent alternatives, and practical surge-protection design notes not found in the manufacturer datasheet.
Alternativas drop-in para SMCJ45A-E3/57T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SMCJ45A-E3/9AT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SMCJ45AHE3/57T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SMCJ45A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SMCJ45A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SMCJ45A-TP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SMCJ45A-13-F
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SMCJ45A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SMCJ45A-E3/57T Classificações máximas e características elétricas
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Series | TransZorb SMCJ5.0A thru SMCJ188CA |
| Product Type | Transient Voltage Suppressor (TVS) Diode |
| Polarity | Uni-directional |
| Encapsulamento / Caixa | DO-214AB (SMCJ), surface mount |
| Package Code (JEDEC) | SMC (DO-214AB) |
| Número de pinos | 2 |
| Configuration | Single |
| Peak Pulse Power (10/1000 µs) | 1500 W |
| Peak Pulse Current (I_PP, 10/1000 µs) | 20.6 A |
| Reverse Standoff Voltage (V_RWM) | 45 V |
| Breakdown Voltage (V_BR) | 50 V (min) to 57.5 V (max) |
| Clamping Voltage (V_C) at I_PP | 72.7 V |
| Tipo de montagem | Surface Mount |
| Packaging | Tape and Reel (TR) |
| Standard Reel Quantity | 850 pcs / 7" reel (per /57T suffix convention) |
| Status RoHS | Compliant |
| Lead-Free | Yes |
| Response Time | < 1 ps (0 V to BV min) |
| Repetition Rate (Duty Cycle) | 0.05% |
| Junction Construction | Glass-passivated chip junction |
Configuração de pinos do SMCJ45A-E3/57T
| Pino 1 | Anode — Anode terminal; connects to the protected line. Polarity-sensitive: reversing for the deposed part disables TVS protection. |
| Pino 2 | Cathode — Cathode terminal; connects to ground or return path. Body marking shows cathode bar on this side. |
Aplicações típicas
SMCJ45A-E3/57T é adequado para 6 aplicaçãos: 24 V Industrial Bus Surge Protection, Automotive Load-Dump Protection (24 V trucks/buses), Telecom and Network Equipment 48 V Protection, USB / HDMI / LVDS Port Protection, DC Motor Drive and Inductive Load Switching, Solar PV String and Battery Management Protection.
24 V Industrial Bus Surge Protection
The SMCJ45A-E3/57T's 45 V V_RWM is engineered for 24 V industrial control systems per IEC 61131-2. With a 72.7 V maximum clamping voltage and 20.6 A peak-pulse current on a 10/1000 µs waveform, the part safely shunts surge events on the 24 V rail (such as load-dump transients up to 1.5 kW) to ground before they reach sensitive PLC inputs, motor drivers, or sensor signal-conditioning circuits. The DO-214AB (SMC) footprint allows compact PCB placement next to field-wiring terminals. Designers typically add a 1-3 A PTC or polyfuse in series for coordinated over-current protection.
Recomendado
Automotive Load-Dump Protection (24 V trucks/buses)
On 24 V automotive systems (commercial trucks, buses, agricultural equipment), the SMCJ45A-E3/57T suppresses load-dump transients up to the 1500 W peak pulse rating. The 45 V V_RWM aligns with nominal 24 V rails and tolerates jump-start spikes to 36 V without clamping. The DO-214AB package's wide-junction geometry handles the high-current load-dump pulse. For automotive qualification, choose the SMCJ45AHE3/57T (HE3 = AEC-Q101). For 12 V automotive systems, choose the SMCJ24A or SMCJ28A variants in the same DO-214AB footprint.
Recomendado
Telecom and Network Equipment 48 V Protection
In 48 V telecom rectifier outputs, the SMCJ45A-E3/57T provides secondary protection against surge events below the 48 V nominal bus voltage. Although the V_RWM is 45 V, parts with 48 V or higher standoff are typical primary protectors; the SMCJ45A serves where the bus tolerance is tighter (some PoE systems). The fast response (< 1 ps) catches nanosecond-scale ESD and EFT events before they propagate to DC-DC converters and PoE controllers. Low reverse leakage preserves standby power efficiency in always-on telecom systems.
Recomendado
USB / HDMI / LVDS Port Protection
Although the SMCJ45A-E3/57T's 45 V V_RWM is over-spec'd for 5 V USB and HDMI signal rails, it can be used on VBUS lines where DC tolerance to 24 V is required (industrial USB hosts, USB Power Delivery up to 20 V). The 72.7 V clamping voltage and fast < 1 ps response safely handle ESD strikes (per IEC 61000-4-2) and cable-discharge events. Lower-V_RWM SMCJ series members (SMCJ5.0A, SMCJ12A, SMCJ24A) are preferred for typical 5 V/12 V/24 V signal-line protection in the same DO-214AB footprint.
Recomendado
DC Motor Drive and Inductive Load Switching
When switching 24 V DC motors, solenoids, or relays, the back-EMF spike can exceed 100 V and damage driver MOSFETs and MCU I/O pins. Placing the SMCJ45A-E3/57T across the motor terminals or across the driver H-bridge absorbs the inductive kick within 72.7 V clamping. The 1500 W peak pulse power handles repetitive inrush events from PWM switching at duty cycles up to 0.05% per datasheet. Pair with a flyback diode for continuous low-duty operation.
Recomendado
Solar PV String and Battery Management Protection
In 24 V battery management systems (BMS) and small off-grid solar PV arrays, the SMCJ45A-E3/57T clamps transient over-voltage events on the battery rail from inductive coupling, load switching, or reverse-charge events. The 45 V V_RWM tolerates a fully-charged 24 V lead-acid string (27.6 V float), while the 72.7 V clamping voltage protects downstream MOSFETs rated 60-80 V. Low reverse leakage preserves battery standby life. For higher-voltage 48 V PV strings, choose SMCJ58A or SMCJ60A in the same DO-214AB footprint.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SMCJ45A-E3/57T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SMCJ45A-E3/9AT | SMCJ45AHE3/57T | SMCJ45A | SMCJ45A | SMCJ45A-TP | SMCJ45A-13-F | SMCJ45A |
|---|---|---|---|---|---|---|---|---|
| Brand | Vishay Intertechnology | Vishay Intertechnology | Vishay Intertechnology | Littelfuse | Bourns | Micro Commercial Components | Diodes Incorporated | STMicroelectronics |
| Package | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) |
| Peak Pulse Power (10/1000 µs) | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W |
| Reverse Standoff Voltage (V_RWM) | 45 V | 45 V | 45 V | 45 V | 45 V | 45 V | 45 V | 45 V |
| Breakdown Voltage (V_BR min) | 50 V | 50 V | 50 V | 50 V | 50 V | 50 V | 50 V | 50 V |
| Clamping Voltage (V_C max) | 72.7 V | 72.7 V | 72.7 V | 72.7 V | 72.7 V | 72.7 V | 72.7 V | 72.7 V |
| Peak Pulse Current (I_PP) | 20.6 A | 20.6 A | 20.6 A | 20.6 A | 20.6 A | 20.6 A | 20.6 A | 20.6 A |
| Polarity | Uni-directional | Uni-directional | Uni-directional | Uni-directional | Uni-directional | Uni-directional | Uni-directional | Uni-directional |
| Automotive Qualification | No (commercial) | No | Yes (AEC-Q101) | No | No | No | No | No |
Principais diferenciais
- Vishay TransZorb SMCJ series - long heritage and broad distribution (vs Littelfuse SMCJ45A)
- Automotive-qualified variant available (HE3 suffix) (vs SMCJ45A-E3/9AT (commercial only))
- Glass-passivated chip junction (vs Non-passivated competing TVS parts)
Notas de projeto
Do not use the 1500 W peak-pulse-power rating for arbitrary pulse widths. The rating is specified on a 10/1000 µs exponential waveform per IEC 61000-4-5. For shorter pulses (e.g. 8/20 µs lightning surge) the device's pulse-power curve must be referenced; for longer pulses (load-dump 10/100 ms) use the load-dump derating curve which permits substantially lower P_PP. Estimated: at 8/20 µs, P_PP typically derates to ~6-8 kW (higher peak current, shorter duration); at 10/100 ms load-dump, P_PP derates to ~200-300 W. Always refer to the published curves in the manufacturer datasheet.
Estimated: under repetitive surge conditions at 0.05% duty cycle, the average power dissipation is P_avg = P_PP x duty_cycle = 1500 W x 0.0005 = 0.75 W. With DO-214AB thermal resistance of approximately 50 °C/W on a standard JEDEC test board (per typical SMC package ratings; not explicitly stated in the provided Verified Web Data - confirm with manufacturer datasheet), this yields ~37 °C junction temperature rise at 25 °C ambient. Heavy copper pours at the land pads reduce thermal resistance and prolong device life under repetitive surges.
Use wide, short PCB traces from the protected line to the TVS anode (pin 1) and from the TVS cathode (pin 2) to ground. The DO-214AB land pads are typically 2.5 mm x 1.6 mm with 1.0 mm-wide solder fillets per JEDEC DO-214AB. Keep trace inductance below 10 nH for nanosecond ESD suppression; long, thin traces defeat the TVS's < 1 ps response. Place the TVS as close as physically possible to the protected IC or connector - within 5 mm is ideal for ESD suppression.
The SMCJ45A-E3/57T is uni-directional; reversing the package (cathode to the protected line) disables protection and applies the line voltage to the breakdown junction continuously, which can destroy the part. The DO-214AB body has a cathode bar marking pin 2; verify orientation with a multimeter (diode-mode forward voltage ~0.6-0.8 V from anode to cathode) before soldering. For AC or bi-polar transient environments, use the SMCJ45CA bi-directional variant instead.
Informações de conformidade
RoHS compliant and lead-free per Vishay product page. AEC-Q101 (not Q100) automotive qualification available on the HE3 variant. REACH, halogen-free, and conflict-minerals status not explicitly stated in the Verified Web Data - confirm with Vishay product compliance team if required.
