SMBJ28CA-E3/52 - 28V 600W Bidirectional TVS Diode | Vishay SMB
N.º de pieza: SMBJ28CA-E3/52 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.41 | $0,41 |
| 10 | $0.31 | $3,10 |
| 100 | $0.21 | $21,00 |
| 500 | $0.16 | $80,00 |
| 1.000 | $0.12 | $120,00 |
| 3.000 | $0.0901 | $270,30 |
SMBJ28CA-E3/52 Descripción general
A Transient Voltage Suppressor (TVS) is a clamping semiconductor device engineered to shunt fast voltage transients away from sensitive electronics. Within the power-protection hierarchy, a TVS sits between passive suppressors (varistors, TVS diodes) and active protection ICs (eFETs, hot-swap controllers). Bidirectional TVS parts like the SMBJ28CA-E3/52 are built on a glass-passivated chip junction, giving them symmetrical V-I characteristics and making them ideal for AC or differential DC signal lines where neither polarity can be excluded.
Key features include ±5 % breakdown voltage tolerance (VBR), 600 W peak pulse power on a 10/1000 µs waveform, a low-profile SMB body suitable for automated pick-and-place, and a glass-passivated die for long-term reliability. The Vishay SMBJ-C series is qualified for AEC-Q101 automotive variants and supports both uni- and bidirectional parts, simplifying BOM across mixed-polarity rails.
The device uses a planar PN-junction avalanche architecture. During a transient event, the junction enters avalanche breakdown at VBR and clamps the line to its rated clamping voltage Vc, dissipating the transient energy as heat. The 0.01 % duty-cycle rating and fast response (<1 ns) make it well suited to repetitive ESD and inductive-switching surges without thermal fatigue.
Typical applications include protection of 24 V industrial buses, automotive 12 V/24 V powertrain lines, RS-485/RS-232 transceivers, and DC-DC converter input rails. Its 600 W rating also covers most lightning-induced surge requirements on outdoor equipment. The bidirectional behavior lets a single part protect both polarities of a differential pair, reducing component count.
When designing in this part, verify that the working voltage of the protected rail stays below 28 V continuous and that the maximum clamping voltage 45.5 V does not exceed the absolute maximum rating of the downstream IC. Route the TVS as close as possible to the connector or vulnerable pin, with short, wide traces to minimize parasitic inductance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a faster path from selection to production.
Alternativas directas para SMBJ28CA-E3/52 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
SMBJ28CA-E3/5BT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMBJ28CAHE3/52
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMBJ28CA-M3/52
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMBJ28CA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMBJ28CA-13-F
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMBJ28CA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMBJ28CA-E3/52 Valores máximos y características eléctricas
| Series | SMBJ (TRANSZORB) |
| Polarity | Bidirectional |
| Reverse Standoff Voltage (Vrwm) | 28 V |
| Breakdown Voltage (VBR) | 31.1 V (min) |
| Breakdown Voltage Tolerance | ±5 % |
| Clamping Voltage (Vc) at Ipp | 45.5 V at 13.2 A |
| Peak Pulse Current (Ipp) | 13.2 A (10/1000 µs) |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) |
| Encapsulado | DO-214AA (SMB) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -55 °C to +150 °C |
| Repetitive Duty Cycle | 0.01 % |
| Waveform | 10/1000 µs |
| Estado RoHS | Compliant |
| Lead-Free / Halogen-Free | Lead-Free (E3 suffix) |
| Packaging | Tape & Reel (suffix /52) |
Configuración de pines de SMBJ28CA-E3/52
| Pin 1 | Terminal 1 (Anode/Cathode) — Bidirectional terminal; connects to protected line |
| Pin 2 | Terminal 2 (Cathode/Anode) — Bidirectional terminal; connects to protected line |
Peak Pulse Power Derating vs Pulse Duration
Aplicaciones típicas
SMBJ28CA-E3/52 es adecuado para 6 aplicacións: 24V Industrial Bus Protection, Automotive 12V/24V Load-Dump Protection, RS-485 / CAN Differential Line Protection, DC-DC Converter Input Protection, PoE and Telecom Line Protection, Industrial Sensor and Actuator I/O Protection.
24V Industrial Bus Protection
The SMBJ28CA-E3/52 is purpose-built for protecting 24 V industrial signal and power lines from voltage transients on factory floors. Its 28 V reverse standoff voltage sits just above the nominal 24 V rail with 4 V headroom, while the 45.5 V clamping voltage stays below the 60 V absolute maximum of typical PLC I/O and 24 V sensor ICs. With 600 W peak pulse power and 13.2 A Ipp on a 10/1000 µs waveform, it easily absorbs inductive kickback from solenoids, contactors, and motor starters. The bidirectional architecture lets a single SMBJ28CA-E3/52 protect differential pairs such as RS-485 or CAN bus running across long cable runs in noisy industrial environments. Place the TVS within 5 mm of the connector entry to minimize parasitic inductance during a surge event, and pair it with a PTC resettable fuse for sustained overcurrent protection.
Recomendado
Automotive 12V/24V Load-Dump Protection
In 12 V and 24 V automotive electrical systems, the SMBJ28CA-E3/52 absorbs inductive transients generated when relays, injectors, or solenoids release stored magnetic energy. Per ISO 7637-2, automotive transients can peak above 35 V on a 24 V system, and the SMBJ28CA-E3/52 clamps at 45.5 V - well within the survival envelope of 24 V-rated automotive MCUs and CAN transceivers. The 600 W rating also handles alternator load-dump pulses after a battery disconnect event. For AEC-Q101 automotive qualification, the HE3-suffixed variant is recommended over the base /52 part. Place the device directly across the protected IC supply pin with the shortest possible trace length to avoid letting the parasitic inductance of long traces push the effective clamp voltage above the IC's absolute maximum.
Recomendado
RS-485 / CAN Differential Line Protection
The bidirectional SMBJ28CA-E3/52 is ideal for protecting RS-485 and CAN bus differential pairs from ESD and surge events on outdoor or factory cabling. Its symmetrical V-I curve clamps both positive and negative transients of equal magnitude, eliminating the need for two unidirectional parts in anti-series. With 13.2 A Ipp and 600 W peak pulse power, it satisfies IEC 61000-4-2 (ESD) air-discharge up to ±15 kV and IEC 61000-4-5 (surge) up to 4 kV with appropriate series resistance. The DO-214AA (SMB) package fits cleanly behind the bus connector, with both signal lines landing on the two TVS terminals. The 31.1 V minimum breakdown voltage sits comfortably above the 12 V common-mode range typical of RS-485 networks, preventing false triggering during normal signaling.
Recomendado
DC-DC Converter Input Protection
Placing a SMBJ28CA-E3/52 across the input of an isolated or non-isolated DC-DC converter protects the upstream supply and the converter's input capacitor from voltage transients on the source rail. The 28 V standoff accommodates a 24 V nominal industrial bus or a 24 V battery stack, while the 45.5 V clamp keeps peak voltage within the converter's input voltage rating (typically 36 V or 40 V). The bidirectional configuration is well suited to battery inputs where polarity reversal is a concern, or to bidirectional power flows in battery-backup systems. At 600 W peak pulse power, the SMBJ28CA-E3/52 also handles the inrush transients that occur when a long cable's distributed inductance dumps energy into a hot-plug event. Place the TVS as close as practical to the converter input pins to minimize trace inductance in the discharge path.
Recomendado
PoE and Telecom Line Protection
The SMBJ28CA-E3/52 protects Power-over-Ethernet (PoE) and telecom line interfaces from lightning-induced surges on outdoor cabling. Per GR-1089 and ITU-T K.20/K.21 requirements, outdoor telecom equipment must survive surge pulses up to 1.5 kV at the line interface; the 600 W peak pulse capability of the SMBJ28CA-E3/52 comfortably meets these stress levels when combined with an appropriate PTC or current-limiting fuse. Its 28 V standoff matches the PoE+ nominal supply voltage with sufficient margin for load transients. The bidirectional configuration simplifies the BOM by allowing a single device to protect both tip and ring polarities of a differential telecom pair. Mount the TVS as close as possible to the line-entry connector with wide, short traces to keep the effective clamping voltage within the downstream PHY's absolute maximum rating.
Recomendado
Industrial Sensor and Actuator I/O Protection
The SMBJ28CA-E3/52 protects 24 V digital input and output channels on PLCs, distributed I/O blocks, and industrial sensor interfaces from ESD and surge events. Each I/O terminal on a PLC is exposed to cable discharges during installation and field service; the bidirectional TVS clamps both positive and negative transients to 45.5 V, safeguarding the opto-isolated input stage or high-side driver IC behind it. The 13.2 A peak pulse current capability handles the cable-discharge event of long shielded cables. The DO-214AA (SMB) package mounts cleanly on the same PCB as the I/O connector, requiring minimal board space and no thermal management thanks to the 0.01 % repetitive duty cycle. Use one SMBJ28CA-E3/52 per I/O channel, or share one across multiple channels if the simultaneous transient probability is low.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SMBJ28CA-E3/52 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | SMBJ28CA-E3/5BT | SMBJ28CAHE3/52 | SMBJ28CA-M3/52 | SMBJ28CA (Littelfuse) | SMBJ28CA-13-F | SMBJ28CA (Bourns) |
|---|---|---|---|---|---|---|---|
| Brand | Vishay Intertechnology | Vishay Intertechnology | Vishay Intertechnology | Vishay Intertechnology | Littelfuse | Diodes Incorporated | Bourns |
| Package | DO-214AA (SMB) | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same |
| Reverse Standoff Voltage (Vrwm) | 28 V | 28 V | 28 V | 28 V | 28 V | 28 V | 28 V |
| Peak Pulse Power (PPP) | 600 W | 600 W | 600 W | 600 W | 600 W | 600 W | 600 W |
| Polarity | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| AEC-Q101 Qualified | No (industrial) | No | Yes (HE3 suffix) | No | No | No | No |
Diferenciadores clave
- Drop-in automotive-grade option in same footprint (frente a SMBJ28CAHE3/52)
- Industry-standard 600 W rating in DO-214AA (frente a SMBJ28CA (Littelfuse))
- Multiple reel and finish variants from same manufacturer (frente a SMBJ28CA-13-F (Diodes Inc.))
Notas de diseño
Place the SMBJ28CA-E3/52 within 5 mm of the protected IC pin or connector entry. Use short, wide traces (at least 0.5 mm width) to minimize parasitic inductance. Estimated: at 13.2 A Ipp on a 10/1000 µs waveform, every 10 nH of trace inductance adds roughly 2-3 V to the effective clamping voltage, potentially pushing it above the downstream IC's absolute maximum.
Although peak pulse power is 600 W, the repetitive duty cycle is 0.01 % (i.e., a 10 ms pulse every 100 s). Estimated: continuous dissipation must stay below 1 W to keep junction temperature rise within 50 °C at the DO-214AA's 80 °C/W θJA on a standard JEDEC test board. For higher repetitive stress, add a copper thermal pad under the SMB body to reduce θJA.
Do not use SMBJ28CA-E3/52 on rails exceeding 28 V continuous - the device will enter avalanche breakdown and dissipate excessive heat. For 30 V rails, choose SMBJ30CA-E3/52 (30 V Vrwm). Also verify that the 45.5 V clamping voltage is below the absolute maximum rating of the protected IC; many 24 V-rated ICs only survive 36 V or 40 V transients.
Solder pad layout should follow the DO-214AA (SMB) JEDEC land pattern: 2.6 mm x 2.0 mm pads with 1.9 mm pitch. Use a thermal pad connection under the SMB body only if your design requires improved heat spreading; standard JEDEC footprints do not include a thermal pad. Reflow profile should not exceed 260 °C peak (per J-STD-020).
Información de cumplimiento
RoHS compliant per Vishay product page; lead-free E3 finish. AEC-Q100 not applicable - select SMBJ28CAHE3/52 for AEC-Q101 automotive. Halogen-free per Vishay documentation. Conflict-mineral compliance maintained per Vishay policy.
