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Diodes Incorporated SMBJ33CA-13-F
- Part No.:
- SMBJ33CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CA-13-F.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:164,006
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Product details
Overview
SMBJ33CA-13-F from Diodes Incorporated is a bi-directional 600W transient voltage suppressor (TVS) diode in SMB package, designed for robust overvoltage protection of DC power lines and signal interfaces. It features a 33V reverse standoff voltage (VRWM), 53.3V maximum clamping voltage at 11.3A peak pulse current, and operates across –55°C to +150°C ambient range - deployed in industrial motor drives and PoE-powered Ethernet equipment.
For engineers reviewing the SMBJ33CA-13-F datasheet, SMBJ33CA-13-F pinout, SMBJ33CA-13-F application, or SMBJ33CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC rails, unidirectional vs. bi-directional polarity requirements for AC-coupled signals, and thermal derating above +25°C ambient.
Technical Context
This bi-directional TVS diode functions as a voltage-clamped shunt protector, responding to transients exceeding its 33V standoff threshold by avalanche breakdown into low-impedance conduction. Its glass-passivated die ensures stable leakage (<5µA @ VRWM) and repeatable breakdown behavior under surge stress.
The device handles 8.3ms half-sine surges up to 11.3A (600W peak), with thermal derating starting at +25°C (4.8W/°C), and maintains clamping performance across its full operating temperature range (–55°C to +150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - sustains single 8.3ms transients without failure in typical surge test conditions (IEC 61000-4-5) |
| Reverse Standoff Voltage (VRWM) | 33.0V - maximum continuous DC or RMS voltage before significant leakage; sets minimum system operating margin |
| Breakdown Voltage (VBR) | 36.7V min / 42.2V max @ 1.0mA - defines precise avalanche initiation window for predictable clamping onset |
| Max Clamping Voltage (VC) | 53.3V @ 11.3A IPP - limits voltage seen by downstream ICs during worst-case surge events |
| Peak Pulse Current (IPP) | 11.3A - maximum non-repetitive surge current the device can safely divert at rated clamping voltage |
| Operating Temperature | –55°C to +150°C - supports deployment in under-hood automotive ECUs and industrial PLC I/O modules |
Pinout & Package
Package: SMB (Surface-Mount Small Outline), molded plastic case per UL 94V-0, 0.1g weight, matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Transient current entry (bi-directional) | No polarity marking; symmetric terminals enable AC line protection without orientation constraints |
| Cathode (Pin 2) | Transient current entry (bi-directional) | Identical to Pin 1; bi-directional operation eliminates need for cathode band or polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| 600W Peak Pulse Power | Enables compliance with IEC 61000-4-5 Level 4 (4kV/2Ω) surge immunity on 24V industrial buses |
| Glass Passivated Die | Ensures long-term stability of breakdown voltage and leakage current under thermal cycling and humidity stress |
| Bi-Directional Configuration | Protects AC-coupled interfaces (e.g., RS-485, CAN FD differential pairs) without polarity-sensitive placement |
| RoHS & Halogen-Free | Meets IPC-1752A material declaration requirements for green electronics manufacturing and end-of-life recycling |
Applications
| Industrial Motor Drives | Power over Ethernet (PoE) |
|---|---|
Use Scenario: Protection of gate drivers and current-sense amplifiers against inductive kickback from 24V/48V BLDC motor controllers. IC Role / Device Role: Shunt clamp limiting transient voltage spikes to ≤53.3V during MOSFET turn-off events. Use Value: Prevents latch-up or oxide damage in 3.3V/5V logic interfaces sharing ground with high-current power stages. |
Use Scenario: Surge suppression on 48V DC power pairs (Mode A or B) in IEEE 802.3af/at/bt PSE/PD systems. IC Role / Device Role: Bi-directional clamping element placed upstream of DC-DC controller input stage. Use Value: Maintains <55V clamping headroom below typical 57V PoE PD overvoltage shutdown threshold. |
| Automotive Body Control Modules | RS-485 Industrial Networks |
Use Scenario: Input protection for LIN/CAN transceivers and microcontroller GPIOs exposed to load-dump and jump-start transients. IC Role / Device Role: Primary front-end TVS on 12V supply rail feeding MCU power management ICs. Use Value: Withstands ISO 7637-2 Pulse 5a (75V/350ms) when combined with series impedance for energy absorption. |
Use Scenario: Common-mode transient suppression on twisted-pair RS-485 data lines in factory automation cabinets. IC Role / Device Role: Bi-directional shunt device bridging A/B lines to ground, referenced to local chassis potential. Use Value: Limits common-mode surge-induced differential offset to <±1V, preserving receiver input thresholds (–7V to +12V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-13-F | Uni-directional; 33V VRWM, same clamping (53.3V), but asymmetric conduction (cathode-banded) | Requires correct polarity alignment; unsuitable for AC-coupled or floating differential lines | Select only when protecting unidirectional DC rails where polarity is fixed and known |
| SMAJ33CA | Same bi-directional function but lower 400W rating; SMA package (smaller footprint, lower thermal mass) | Limited to lower-energy transients (e.g., ESD-only); not rated for IEC 61000-4-5 Level 3+ surges | Choose for space-constrained designs with verified sub-400W surge exposure profiles |
Compared with SMBJ33CA-13-F, the uni-directional SMBJ33A-13-F offers identical clamping but requires strict polarity control, while the SMAJ33CA sacrifices 33% peak power capacity for smaller size - making the SMBJ33CA-13-F optimal for high-energy industrial surge environments demanding both bi-directionality and 600W capability.
Availability
SMBJ33CA-13-F is available at Aetrix Electronics and suitable for industrial motor drives, Power over Ethernet (PoE) injectors, automotive body control modules, and RS-485 fieldbus networks requiring stable component supply across extended product lifecycles.
Supply support for SMBJ33CA-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
This SMBJ33CA-13-F belongs to Diodes' SMBJ series of surface-mount TVS diodes, engineered specifically for high-power transient suppression in harsh industrial and automotive environments where reliability under repeated surge stress is critical.
FAQ
What is the difference between SMBJ33CA-13-F and SMBJ33A-13-F?
The "C" suffix denotes bi-directional construction, meaning SMBJ33CA-13-F clamps transients in both polarities without polarity sensitivity. SMBJ33A-13-F is uni-directional, featuring a cathode band and conducting only when reverse-biased - requiring correct orientation during PCB placement and unsuitable for AC or floating differential signals.
Can SMBJ33CA-13-F be used for IEC 61000-4-5 surge protection?
Yes - its 600W peak pulse rating, 53.3V clamping voltage at 11.3A, and 8.3ms waveform compliance meet IEC 61000-4-5 Level 4 (4kV, 2Ω source impedance) requirements when properly mounted with low-inductance layout and appropriate series impedance to limit total surge current.
What is the thermal derating behavior above +25°C ambient?
SMBJ33CA-13-F derates linearly at 4.8W/°C above +25°C ambient. At +75°C lead temperature, its steady-state power dissipation drops to 5.0W. This must be accounted for in high-temperature enclosures or when multiple devices share thermal mass on a PCB.
Is SMBJ33CA-13-F halogen-free and RoHS compliant?
Yes - it meets EU RoHS Directive 2011/65/EU and is certified halogen- and antimony-free ("Green"): Br <900ppm, Cl <900ppm (total Br+Cl <1500ppm), Sb <1000ppm, with matte tin lead finish compliant to J-STD-020 moisture sensitivity Level 1.
SMBJ33CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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):
- 11.3A
- 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-13-F FAQ
1.How can I place an order for SMBJ33CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CA-13-F 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-13-F reliable?
The price and inventory of SMBJ33CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CA-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ33CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CA-13-F?
SMBJ33CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CA-13-F 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-13-F?
For technical support, including SMBJ33CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CA-13-F requirements.
6.How does Aetrix verify that SMBJ33CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ33CA-13-F 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-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ33CA-13-F?
All SMBJ33CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CA-13-F, 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-13-F part is unused and in its original packaging.
Return procedure for SMBJ33CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CA-13-F Tags
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