My Inquiry
My Account
STMicroelectronics SMBJ33CA-TR
- Part No.:
- SMBJ33CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CA-TR.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:33,034
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ33CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection of signal lines, power rails, and I/O interfaces in industrial, automotive, and telecom equipment. It delivers 600 W peak pulse power (10/1000 µs), clamps transients to 53.3 V at 11.8 A, and operates up to 150 °C junction temperature with <0.2 µA leakage at 25 °C - ideal for protecting sensitive MOSFETs and ICs against IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 (4 kV) threats.
For engineers reviewing the SMBJ33CA-TR datasheet, SMBJ33CA-TR pinout, SMBJ33CA-TR application, or SMBJ33CA-TR equivalent, this device is selected for high-reliability overvoltage protection where low leakage, fast response (<1 ns), and stable clamping under thermal stress are critical - especially in SMPS input stages, Ethernet PHY interfaces, and CAN bus front-ends.
Technical Context
This bidirectional TVS diode uses planar silicon technology to achieve low dynamic resistance (1.08 Ω at 10/1000 µs), enabling precise clamping across both polarities without polarity-dependent biasing. Its breakdown voltage is specified at 36.7–38.6 V (min/max at 1 mA), with temperature coefficient αT = 10.0 × 10−4/°C, allowing accurate VBR and VCL extrapolation across −55 °C to +150 °C.
The device complies with UL497B (file E136224) as an isolated loop circuit protector and meets IEC 61000-4-2 Level 4 (±30 kV) and IEC 61000-4-4 Level 4 (4 kV). Its SMB package supports JEDEC-standard footprint and IPC7531 layout, with matte tin-plated leads qualified per J-STD-002 and JESD 22-B102 E3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 600 W - sustains repetitive surges in industrial power supply inputs without degradation |
| Clamping Voltage (VCL) | 53.3 V at 11.8 A - limits downstream voltage to safe levels during 10/1000 µs transients |
| Breakdown Voltage (VBR) | 36.7–38.6 V at 1 mA - ensures reliable triggering before damage to protected 3.3 V/5 V/24 V circuits |
| Leakage Current (IR) | 0.2 µA max at 25 °C - minimizes standby power loss in battery-backed or low-power sensor nodes |
| Junction Temperature Range | −55 °C to +150 °C - enables operation in under-hood automotive or high-ambient industrial environments |
| ESD Withstand (IEC 61000-4-2) | ±30 kV air/contact discharge - exceeds Level 4 for direct human interaction points like USB or HDMI ports |
| Dynamic Resistance (RD) | 1.08 Ω - reduces voltage overshoot during fast-rising transients (e.g., relay switching, lightning-induced spikes) |
Pinout & Package
The SMBJ33CA-TR is housed in an SMB (DO-214AA) surface-mount package measuring 3.95 mm × 5.60 mm × 2.45 mm (L × W × H), with gull-wing leads on 5.10 mm center-to-center spacing. It features two terminals: Cathode (K) and Anode (A), configured symmetrically for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| K / A | Bidirectional cathode/anode pair | Interchangeable terminals - no polarity dependency; conducts equally in both directions above VBR |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, audio) without external polarity management |
| Low dynamic resistance (1.08 Ω) | Minimizes clamping voltage rise under high-current surges, preserving margin for 33 V-rated components |
| UL497B recognition (E136224) | Validates suitability for isolated loop protection in safety-critical industrial control systems per regulatory requirements |
| JEDEC-standard SMB footprint | Ensures drop-in compatibility with existing PCB layouts and automated assembly processes using standard reflow profiles |
| 150 °C maximum junction temperature | Supports high-density board designs with limited airflow, such as enclosed power converters or motor drive modules |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against load dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional TVS placed between field wiring and optocoupler input, clamping transients before they reach isolation barrier. Use Value: Prevents false triggering and long-term degradation of optocouplers by limiting voltage to ≤53.3 V during 10/1000 µs surges up to 600 W. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in body electronics exposed to battery reverse connection and jump-start events. IC Role / Device Role / Timing Role: Standoff protection element on LIN data line and 12 V supply rail, operating within ±30 kV ESD tolerance and 150 °C ambient. Use Value: Maintains signal integrity during hot-swap and ESD events while surviving under-hood thermal cycling without parametric shift. |
| Telecom PoE Interface | Industrial SMPS Input Stage |
Use Scenario: Shielding Power over Ethernet (PoE) data pairs from lightning-induced surges and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS mounted differential across each twisted pair, referenced to chassis ground via low-inductance path. Use Value: Clamps common-mode transients to <55 V while maintaining <0.2 µA leakage to avoid affecting 100BASE-TX DC balance and return loss. | Use Scenario: Overvoltage protection on bulk capacitor input of 300 W AC/DC converter subjected to mains-borne surges and rectifier ringback. IC Role / Device Role / Timing Role: Primary-stage TVS shunting surge energy before it stresses bridge rectifier and primary-side MOSFETs. Use Value: Absorbs 600 W (10/1000 µs) pulses without thermal runaway, leveraging planar construction for stable performance at Tj = 150 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA from Vishay (SMCJ33CA) | Same SMB package, identical VBR (36.7–38.6 V), but higher VCL = 56.5 V at 10.5 A (10/1000 µs) | Lower clamping margin for 33 V-rated downstream components; requires larger safety margin in design | Select when legacy Vishay BOM alignment is required and clamping voltage margin permits |
| P6SMB33CA from ON Semiconductor | Same electrical specs and SMB footprint, but rated for only 600 W (10/1000 µs) with no 4 kW (8/20 µs) rating listed | Lacks documented high-energy surge capability needed for lightning-prone outdoor installations | Prefer for cost-sensitive consumer-grade applications where 8/20 µs surge immunity is not mandated |
Compared with SMBJ33CA-TR, the Vishay SMCJ33CA offers identical form factor but sacrifices 3.2 V clamping headroom, while the ON Semiconductor P6SMB33CA omits verified 4 kW (8/20 µs) surge handling - making the STMicroelectronics part optimal for high-reliability industrial and automotive deployments demanding both precision clamping and multi-waveform resilience.
Availability
SMBJ33CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive BCM interfaces, telecom PoE ports, and industrial SMPS input stages requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ33CA-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering innovative solutions across automotive, industrial, power, and smart mobility markets with strong R&D investment and manufacturing scale.
The SMBJ series belongs to ST's high-reliability TVS portfolio, engineered specifically for mission-critical overvoltage protection in harsh environments - emphasizing low leakage, thermal stability, and compliance with UL, IEC, and AEC-Q200-aligned reliability standards.
FAQ
What is the standoff voltage (VRM) of SMBJ33CA-TR?
The maximum reverse standoff voltage (VRM) is 33 V - meaning the device remains non-conductive below this voltage under normal operation, providing reliable isolation for 33 V-rated circuits while triggering precisely above its 36.7 V minimum breakdown threshold.
Does SMBJ33CA-TR support lead-free reflow soldering?
Yes - it features matte tin-plated leads qualified per J-STD-020 MSL Level 1 and supports ST's recommended reflow profile with peak temperature of 240–245 °C for 60 seconds, fully compatible with RoHS-compliant PCB assembly processes.
How does SMBJ33CA-TR differ from unidirectional SMBJ33A-TR?
SMBJ33CA-TR is bidirectional with symmetrical VBR and VCL in both polarities, enabling protection of AC signals or floating lines; SMBJ33A-TR is unidirectional and must be oriented with cathode toward positive rail, limiting use to DC-biased paths like power supply inputs.
Is SMBJ33CA-TR certified for use in safety-isolated circuits?
Yes - it is UL497B-recognized (file E136224) as an isolated loop circuit protector, validating its suitability for use in safety-rated industrial control systems where galvanic isolation integrity must be maintained during surge events.
SMBJ33CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 11.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMBJ33CA-TR FAQ
1.How can I place an order for SMBJ33CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CA-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ33CA-TR reliable?
The price and inventory of SMBJ33CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ33CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CA-TR?
SMBJ33CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CA-TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ33CA-TR?
For technical support, including SMBJ33CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CA-TR requirements.
6.How does Aetrix verify that SMBJ33CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ33CA-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ33CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ33CA-TR?
All SMBJ33CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CA-TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ33CA-TR part is unused and in its original packaging.
Return procedure for SMBJ33CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CA-TR Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
