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Vishay General Semiconductor - Diodes Division SMBJ33CAHM3_A/H
- Part No.:
- SMBJ33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHM3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:10,400
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Product details
Overview
SMBJ33CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), protecting MOSFETs and sensor interfaces in industrial and telecom equipment.
For engineers reviewing the SMBJ33CAHM3_A/H datasheet, SMBJ33CAHM3_A/H pinout, SMBJ33CAHM3_A/H application, or SMBJ33CAHM3_A/H equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low leakage (<1.0 µA at VWM), AEC-Q101 qualification, and halogen-free RoHS compliance are required.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the low incremental surge resistance minimizes voltage overshoot during transient events.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. Its thermal resistance (RθJA = 100 °C/W) reflects standard PCB pad layout performance, and it supports repetitive surge duty cycles up to 0.01 %.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Verified breakdown threshold range ensuring consistent turn-on across production lots. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| IPPM | 11.3 A - Peak surge current capability under standardized 10/1000 µs waveform; directly tied to 600 W PPPM rating. |
| Leakage ID | <1.0 µA at 33 V - Ultra-low reverse leakage preserves signal integrity and battery life in always-on circuits. |
| Package | SMB (DO-214AA) - Industry-standard surface-mount outline with 5.59 mm max length and 2.20 mm max height; optimized for automated placement. |
| Qualification | AEC-Q101 qualified & halogen-free - Validated for automotive-grade reliability and environmental compliance per JEDEC standards. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; both ends function identically in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no polarity dependency enables universal placement on AC or differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, or ungrounded sensor outputs without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy surges common in industrial motor drives and telecom line transients without degradation. |
| AEC-Q101 qualification | Validates reliability for automotive infotainment, body control modules, and ADAS sensor interfaces subject to harsh thermal cycling. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and eliminates corrosive halogen emissions during PCB reflow or end-of-life incineration. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, reducing handling constraints in high-volume SMT lines. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback signal lines against inductive kickback from BLDC motor switching. IC Role / Device Role: Bidirectional TVS placed across gate-source or analog sensor inputs to clamp ±50 V transients. Use Value: Limits voltage excursion to 53.3 V, preventing MOSFET avalanche failure and ADC input saturation during 11.3 A surge events. |
Use Scenario: Shielding LIN bus transceivers and pressure sensor outputs from load dump and jump-start surges. IC Role / Device Role: Standoff-rated clamping element on bidirectional data lines with no DC bias polarity constraint. Use Value: Maintains signal fidelity with <1.0 µA leakage at 33 V while surviving repeated 600 W pulses per ISO 7637-2 Pulse 5a. |
| Telecom Power Feeds | Consumer USB-C Port Protection |
|
Use Scenario: Safeguarding PoE-powered Ethernet PHYs and auxiliary DC feeds from lightning-induced surges on outdoor cabling. IC Role / Device Role: Primary overvoltage clamp on secondary-side 33 V rails feeding remote PHY ICs. Use Value: Clamps 10/1000 µs transients to ≤53.3 V within nanoseconds, preserving PHY latch-up immunity and IEEE 802.3af compliance. |
Use Scenario: Dual-direction surge suppression on USB-C CC and VCONN lines exposed to hot-plug ESD and cable coupling. IC Role / Device Role: Symmetric transient suppressor bridging differential or floating control lines without ground reference. Use Value: Eliminates need for two unidirectional devices; reduces BOM count and PCB area while meeting IEC 61000-4-2 Level 4 (±15 kV air). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CAHE3_A/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (non-halogen-free, non-AEC-Q101). | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial designs not requiring AEC-Q101 or green material mandates. | Select when cost sensitivity outweighs halogen-free or automotive requirements; identical footprint and solder profile. |
| SMAJ33CAHM3_A/H | Lower 400 W PPPM rating, same VWM/VC, but in smaller SMA (DO-214AC) package with higher RθJA (150 °C/W). | Reduced surge energy handling and higher thermal impedance limit use to lower-duty-cycle applications like consumer peripherals. | Choose only if space constraints prohibit SMB; verify thermal derating and surge repetition rate compatibility. |
Compared with SMBJ33CAHM3_A/H, SMBJ33CAHE3_A/H trades halogen-free and AEC-Q101 compliance for lower cost, while SMAJ33CAHM3_A/H sacrifices 33 % peak power handling and thermal performance for 30 % smaller footprint-neither is pin-compatible due to differing package outlines.
Availability
SMBJ33CAHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power feeds, and consumer USB-C port protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ33CAHM3_A/H 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom systems demanding AEC-Q101 validation and robust 600 W surge handling.
FAQ
What is the clamping voltage of SMBJ33CAHM3_A/H under a 10/1000 µs surge?
The SMBJ33CAHM3_A/H clamps to a maximum of 53.3 V when subjected to its rated 11.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is guaranteed across temperature and production lot variations, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ33CAHM3_A/H achieves this with low incremental resistance, minimizing overshoot beyond VC.
Is SMBJ33CAHM3_A/H suitable for automotive applications?
Yes, SMBJ33CAHM3_A/H is AEC-Q101 qualified and halogen-free, making it suitable for automotive applications including body electronics, infotainment systems, and sensor interfaces. Its 150 °C maximum junction temperature, MSL Level 1 rating, and validated surge performance per ISO 7637-2 support deployment in under-hood and cabin environments. The SMBJ33CAHM3_A/H meets automotive reliability and material compliance requirements without derating.
How does the bidirectional nature of SMBJ33CAHM3_A/H affect PCB layout?
The bidirectional structure of SMBJ33CAHM3_A/H eliminates polarity marking and allows orientation-agnostic placement on PCBs-no cathode band alignment is needed. This simplifies layout for AC-coupled lines, differential buses (e.g., RS-485), or floating sensors, reducing assembly errors and enabling reuse across multiple signal types. The SMBJ33CAHM3_A/H's symmetrical terminals function identically regardless of current direction, removing routing constraints associated with unidirectional TVS devices.
What is the maximum reverse leakage current for SMBJ33CAHM3_A/H at its stand-off voltage?
The SMBJ33CAHM3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 33 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves signal integrity in high-impedance sensor front-ends and extends battery life in always-on monitoring circuits. Leakage remains well below 5 µA across the full -55 °C to +125 °C operating range, as confirmed in Vishay's characterization data for the SMBJ33CAHM3_A/H family.
Can SMBJ33CAHM3_A/H replace a unidirectional TVS in an existing design?
SMBJ33CAHM3_A/H can replace a unidirectional TVS only if the circuit topology supports bidirectional clamping-such as AC signal paths, isolated power rails, or differential interfaces. It must not be used where DC bias polarity is critical (e.g., single-supply rail clamping), as its symmetrical behavior lacks inherent anode/cathode directionality. Layout changes may be needed to remove polarity-dependent routing; the SMBJ33CAHM3_A/H itself requires no schematic modification but demands functional verification of clamping symmetry in the target application.
SMBJ33CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ33CAHM3_A/H FAQ
1.How can I place an order for SMBJ33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHM3_A/H 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 SMBJ33CAHM3_A/H reliable?
The price and inventory of SMBJ33CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHM3_A/H?
SMBJ33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHM3_A/H 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 SMBJ33CAHM3_A/H?
For technical support, including SMBJ33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHM3_A/H 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 SMBJ33CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHM3_A/H?
All SMBJ33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHM3_A/H, 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 SMBJ33CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHM3_A/H Tags
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