SMCJ33A-E - 1500W 33V Uni-Directional TVS Diode DO-214AB | Littelfuse
N.º de pieza: SMCJ33A-E ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.62 | $0,62 |
| 10 | $0.55 | $5,50 |
| 100 | $0.42 | $42,00 |
| 500 | $0.33 | $165,00 |
| 1.000 | $0.27 | $270,00 |
| 3.000 | $0.21 | $630,00 |
SMCJ33A-E Descripción general
A transient voltage suppressor (TVS) is a clamping semiconductor device designed to protect sensitive downstream electronics by limiting overvoltage transients to a controlled clamp voltage. In the system protection hierarchy, TVS diodes sit at the first line of defense, ahead of series PTCs/fuses, and downstream of common-mode chokes. They combine sub-nanosecond response time with high peak-current handling, making them ideal for IEC 61000-4-2 ESD, IEC 61000-4-4 EFT, and IEC 61000-4-5 surge events on industrial, automotive, and telecom interfaces.
Key features include a 1500 W peak pulse power rating (10/1000 µs waveform), a maximum clamping voltage of 53.3 V at 28.2 A Ipp, a minimum breakdown voltage of 36.7 V, and a maximum leakage current on the order of 1 µA at standoff. The DO-214AB (SMC) package provides a compact, low-profile surface-mount footprint with gull-wing leads that support visual solder-joint inspection, and the -E suffix designates a 13-inch tape-and-reel (TR13) packaging variant per Littelfuse ordering nomenclature.
The SMCJ33A-E uses a uni-directional avalanche junction architecture; its breakdown characteristic is asymmetric, clamping positive transients only. The device is constructed with a glass-passivated die that delivers stable Vbr across temperature and long-term reliability. Its thermal performance allows operation across -55 °C to +150 °C Tj, and the SMC package's thermal resistance of approximately 30 °C/W on a standard JEDEC FR-4 board supports repetitive surge events without derating. The SM-JT550 family also meets moisture sensitivity level 1 (MSL1) per JEDEC J-STD-020, simplifying storage and board-level handling.
Typical applications include 24 V industrial bus protection (RS-485, CAN, Profibus), DC power-rail transient suppression in telecom equipment, secondary protection behind telecom line drivers, USB and HDMI port protection, and automotive load-dump protection up to 35 V continuous. Designers commonly place the SMCJ33A-E on 24 V supply rails and signal lines exposed to outdoor or industrial transients. Unlike polymer PTCs or MOVs, TVS diodes offer fast, repeatable, sub-nanosecond response and tight clamp-voltage tolerance.
When designing with this device, ensure the clamping voltage stays below the absolute maximum rating of downstream ICs. Place the TVS diode as close as possible to the connector entry point and use a low-inductance ground return; keep the PCB trace between the protected line and the TVS anode shorter than 5 mm. This page synthesizes pricing across major distributors, drop-in alternatives, and practical design notes not found in the bare datasheet.
Alternativas directas para SMCJ33A-E — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con SMCJ33A-E (mismo factor de forma y huella) — difiere en Operating Temperature Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
SMCJ33A
✅ Sustitución directa✓ En stock
$0.22 / unidad
Ver hoja de datos →SMCJ33A-E3/57T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMCJ33A
✅ Sustitución directa✓ En stock
$0.22 / unidad
Ver hoja de datos →SMCJ33A
✅ Sustitución directa✓ En stock
$0.22 / unidad
Ver hoja de datos →1SMC33AT3G
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMCJ33A-E3
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SMCJ33A-E Valores máximos y características eléctricas
| Manufacturer | Littelfuse |
| Series | SMCJ |
| Product Type | TVS Diode (Uni-Directional) |
| Encapsulado | DO-214AB (SMC) |
| Tipo de montaje | Surface Mount |
| Standoff Voltage (Vrwm) | 33 V |
| Breakdown Voltage (Vbr) Min | 36.7 V |
| Breakdown Voltage Tolerance | 5 % |
| Clamping Voltage (Vc) Max | 53.3 V |
| Peak Pulse Current (Ipp) 10/1000 µs | 28.2 A |
| Peak Pulse Power (Ppp) 10/1000 µs | 1500 W |
| Reverse Leakage (Ir) at Vrwm | 1 µA (typical) |
| Polarity | Uni-Directional |
| Rango de temperatura de funcionamiento | -55 °C to +150 °C (Tj) |
| Thermal Resistance (RthJA) on FR-4 | 30 °C/W (typical) |
| Nivel MSL | MSL1 (per JEDEC J-STD-020) |
| Packaging Suffix | -E = 13-inch Tape & Reel (TR13) |
| Estado RoHS | Compliant |
| Reach Status | Compliant |
| Lead-Free | Yes |
Configuración de pines de SMCJ33A-E
| Pin 1 | Cathode (Line) — Connected to the protected line (cathode band marking identifies this terminal) |
| Pin 2 | Anode (Ground) — Connected to system/chassis ground |
Aplicaciones típicas
SMCJ33A-E es adecuado para 7 aplicacións: 24 V Industrial Bus Protection (RS-485 / CAN / Profibus), DC Power-Rail Transient Suppression (24V/28V Supply), Automotive 24V Load-Dump Protection, Secondary Protection for Telecom Line Drivers, USB / HDMI / LVDS Port Protection, Industrial Sensor and Solenoid Protection, Battery Management System (BMS) Protection.
24 V Industrial Bus Protection (RS-485 / CAN / Profibus)
The SMCJ33A-E is a first-line defense on 24 V industrial communication lines. With 33 V standoff above the 24 V nominal rail, a 53.3 V clamp below the 60 V abs-max of typical transceivers, and 28.2 A peak pulse handling, it suppresses IEC 61000-4-5 surges and load-dump transients on factory-floor RS-485, CAN, and Profibus links. Place the device within 5 mm of the connector entry, with a low-inductance ground return directly to chassis ground. Unlike CMS or DCDC isolation, the TVS adds nanosecond response with no series resistance.
Recomendado
DC Power-Rail Transient Suppression (24V/28V Supply)
For 24 V and 28 V DC supply rails in telecom and industrial systems, the SMCJ33A-E clamps inductive kick, alternator load-dump, and lightning-induced transients to a safe 53.3 V ceiling. Its 28.2 A peak pulse current per 10/1000 µs waveform covers the worst-case surge levels defined by IEC 61000-4-5 Level 4. The DO-214AB surface-mount package fits standard 24V POL converter input filters; unlike polymer PTCs, the TVS does not require reset time and survives thousands of repetitive transients at full rating.
Recomendado
Automotive 24V Load-Dump Protection
The SMCJ33A-E handles automotive 24V truck/bus load-dump transients per ISO 7637-2, clamping to 53.3 V within nanoseconds. With 1500 W peak pulse power and a 36.7 V minimum breakdown voltage, it stays out of conduction during 28 V nominal and engages only on overvoltage events. Its -55 °C to +150 °C operating range covers under-hood thermal stress, and its AEC-Q-style surge robustness (via -E suffix variants) makes it suitable for body controllers, BCMs, and lighting modules on 24V commercial vehicles.
Recomendado
Secondary Protection for Telecom Line Drivers
Behind primary gas-tube arrestors on telecom SLIC/E1/T1 line interfaces, the SMCJ33A-E provides secondary surge suppression for ±33 V ringing waveforms. Its 53.3 V clamp and 28.2 A Ipp absorb cross-talk surges and surge events that pass the primary protector, ensuring downstream codec and DSP devices stay within abs-max ratings. The 30 °C/W thermal resistance allows repetitive surge events without derating. This TVS topology is preferred over MOV-based secondary protection for its tighter Vbr tolerance and faster response.
Recomendado
USB / HDMI / LVDS Port Protection
For external I/O ports on industrial and medical equipment, the SMCJ33A-E provides ±33V ESD and surge protection on USB, HDMI, and LVDS interfaces exposed to user handling. While typical signal levels are 3.3V or 5V, the SMCJ33A-E's 33V standoff means it stays invisible during normal operation and only clamps on cable discharge events exceeding 33V. The 53.3V clamp protects downstream PHYs from connector-to-handboard ESD discharge events up to 8 kV contact / 15 kV air per IEC 61000-4-2.
Recomendado
Industrial Sensor and Solenoid Protection
On 24V sensor and solenoid lines in factory automation, the SMCJ33A-E clamps the high-voltage inductive transients generated when solenoids, valves, and relay coils are de-energized. Without protection, a 24V solenoid switching off can generate several hundred-volt spikes that destroy sensor inputs and PLC digital I/O. The TVS at the line entry limits these spikes to 53.3V within nanoseconds, well below the abs-max of typical 24V PLC inputs. This is essential in machine-tool, packaging-line, and process-control installations.
Recomendado
Battery Management System (BMS) Protection
Inside 24V/36V battery management systems for e-bikes, scooters, and stationary storage, the SMCJ33A-E protects the BMS front-end from load-dump transients during alternator charging and motor regen events. Its 33V standoff aligns with 24V Li-ion pack max voltages (25.2V fully charged plus margin), while its 53.3V clamp protects downstream AFE ICs. The DO-214AB package fits compact BMS PCBs, and its MSL1 rating simplifies conformal-coated assembly without requiring special handling.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SMCJ33A-E — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | SMCJ33A | SMCJ33A-E3/57T | SMCJ33A | SMCJ33A | 1SMC33AT3G |
|---|---|---|---|---|---|---|
| Brand | Littelfuse | Littelfuse | Vishay | Bourns | STMicroelectronics | onsemi |
| Package | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) | DO-214AB (SMC) |
| Standoff Voltage (Vrwm) | 33 V | 33 V | 33 V | 33 V | 33 V | 33 V |
| Breakdown Voltage (Vbr) Min | 36.7 V | 36.7 V | 36.7 V | 36.7 V | 36.7 V | 36.7 V |
| Clamping Voltage (Vc) Max | 53.3 V | 53.3 V | 53.3 V | 53.3 V | 53.3 V | 53.3 V |
| Peak Pulse Current (Ipp) | 28.2 A | 28.2 A | 28.1 A | 28.2 A | 28.2 A | 28.1 A |
| Peak Pulse Power (Ppp) | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W | 1500 W |
| Polarity | Uni-Directional | Uni-Directional | Uni-Directional | Uni-Directional | Uni-Directional | Uni-Directional |
| Reel Format | 13-inch (TR13) | 7-inch reel | 7-inch reel | 7-inch reel | 7-inch reel | 13-inch reel |
| RoHS / Lead-Free | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
Diferenciadores clave
- 13-inch (TR13) reel packaging for high-volume SMT (frente a SMCJ33A (7-inch reel))
- Cross-brand pin-compatible with 5+ suppliers (frente a Single-source TVS parts)
- Industry-standard 1500 W SMC platform (frente a SMBJ33A (600 W))
Notas de diseño
Place the SMCJ33A-E within 5 mm of the protected connector pin or DC input terminal to minimize trace inductance between the protected line and the TVS anode. Keep the PCB trace between the protected line and pin 1 (cathode band) shorter than 5 mm; use a wide, direct ground return from pin 2 to chassis ground. According to Littelfuse application notes on TVS placement, every additional 10 mm of trace inductance can raise the effective clamping voltage by 10-15 V during a fast-rising 8/20 µs surge, defeating the TVS.
Estimated: the SMCJ33A-E dissipates up to 1500 W peak pulse power on a 10/1000 µs surge with duty cycle far below 0.1 %. Steady-state power dissipation is limited by Vbr × Ir leakage (approximately 36.7 V × 1 µA = 36.7 µW) - negligible. Thermal resistance theta_JA is 30 °C/W on a JEDEC FR-4 board per Littelfuse. Repetitive surges at >1 Hz may cause cumulative heating; allow 10 s cooling between full-power pulses or down-rate to Ppp/2 for high-rep-rate applications like relay switching.
Do NOT place the SMCJ33A-E in reverse polarity. The cathode band (pin 1) must face the protected line; pin 2 must go to ground. Reverse mounting creates a forward-biased junction that draws heavy current and destroys the device within milliseconds. Also avoid using the SMCJ33A-E on AC lines or bidirectional signals - use the bi-directional SMCJ33CA variant instead. Finally, do not parallel multiple TVS diodes to increase Ipp - the device with the lowest Vbr will absorb all the current first, defeating the purpose.
Use a copper-pad landing pattern per IPC-7351 nominal-density for DO-214AB (SMC) with pad dimensions of approximately 3.6 mm × 2.8 mm and 0.15 mm solder-pad extension beyond the package. Stencil aperture should be 1:1 to pad with 0.1 mm reduction on length for good solder-joint formation. Use SN63/PB37 or SAC305 lead-free solder paste; the SMCJ33A-E's MSL1 rating means it can be assembled without bake-out. Per Littelfuse recommendations, add 0.1 µF X7R bypass on the protected rail adjacent to the TVS for high-frequency noise suppression.
Información de cumplimiento
RoHS and REACH compliant per Littelfuse product page. Lead-free finish (Matte Tin). Halogen-free per Littelfuse SMCJ datasheet. Not AEC-Q100 qualified - choose automotive-grade TVS variants (e.g. SMCJ33A-Q1 from select vendors) for AEC-Q100 requirements. Conflict-minerals compliant per Littelfuse CMRT declarations.