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Vishay General Semiconductor - Diodes Division SMBJ33CAHM3_B/H
- Part No.:
- SMBJ33CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHM3_B/H.pdf
- Description:
- 600W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,243
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Product details
Overview
SMBJ33CAHM3_B/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ33CAHM3_B/H datasheet, SMBJ33CAHM3_B/H pinout, SMBJ33CAHM3_B/H application, or SMBJ33CAHM3_B/H equivalent, this device is selected for bidirectional surge immunity in automotive-grade consumer electronics, telecom line protection, and I/O port hardening where low-leakage (<1.0 µA at VWM) and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling clamping during positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, while the MSL Level 1 moisture sensitivity rating supports lead-free reflow up to 260 °C peak.
The device complies with ANSI/IEEE C62.35 for transient suppressor definitions and delivers repeatable clamping performance under 0.01% duty cycle conditions. Thermal resistance is characterized at RθJA = 100 °C/W (on 0.2" × 0.2" copper pads), supporting operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; defines safe DC/AC working margin. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during surges above VWM. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamped voltage limiting downstream IC stress during 10/1000 µs transients. |
| PPPM | 600 W - Peak pulse power handling capability per single 10/1000 µs event; enables protection against lightning-induced surges. |
| IPPM | 11.3 A - Peak surge current supported at rated clamping voltage; validated with derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum junction temperature allowing sustained operation in high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated placement. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as anode and cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal conducts when reverse-biased beyond VBR; no fixed polarity - used interchangeably in AC or differential signal paths. |
| Terminal 2 | Anode/Cathode (bidirectional) | Identical role to Terminal 1; forms symmetrical clamping pair across protected node and ground or rail. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) with appropriate PCB layout. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Fulfills environmental compliance requirements for industrial and automotive end equipment without compromising surge robustness. |
| AEC-Q101 qualified option available | HM3 variant meets stress-test requirements for automotive electronics, including temperature cycling and HTRB. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) from ESD and load dump-induced spikes in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±2 kV contact ESD and inductive kickback. Use Value: Limits voltage excursion to ≤53.3 V, preventing damage to precision DACs or op-amps while maintaining <1 µA leakage at 33 V nominal rail. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs against battery reverse connection and alternator load dump in door modules. IC Role / Device Role / Timing Role: Parallel-connected TVS on LIN data line referenced to battery ground, absorbing 10/1000 µs surges up to 600 W. Use Value: Maintains signal integrity during 12 V system transients by clamping within 1 ns, with no polarity dependency due to bidirectional symmetry. |
| Telecom Ethernet PHY Port | Consumer Appliance Motor Drive |
|
Use Scenario: Shielding 10/100BASE-TX transformer-coupled pairs from lightning-induced common-mode surges in residential gateways. IC Role / Device Role / Timing Role: TVS array (dual SMBJ33CAHM3_B/H) across differential pair and to ground, meeting IEC 61000-4-5 surge immunity. Use Value: Achieves 53.3 V clamping at 11.3 A, keeping induced voltage below PHY IC absolute maximum ratings even under worst-case coupling. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb inductive energy during PWM switching and mechanical commutation events. Use Value: Handles repetitive 600 W pulses at 0.01% duty cycle without degradation, extending MOSFET lifetime and reducing conducted EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-E3/52 | RoHS-compliant commercial grade (E3), non-halogen-free; same electrical specs and SMB package. | Lacks halogen-free certification; not suitable for automotive or green-electronics compliance programs requiring HM3. | Select when halogen-free content is not mandated and cost optimization is prioritized over material compliance. |
| SMBJ33CAHM3_A/H | Same HM3 halogen-free, RoHS-compliant, AEC-Q101 qualified construction; differs only in revision code (A vs B). | Functionally identical; revision B may include minor process enhancements per Vishay internal change notice. | Prefer SMBJ33CAHM3_B/H for new designs to ensure latest manufacturing revision and traceability. |
Compared with SMBJ33CA-E3/52 and SMBJ33CAHM3_A/H, the SMBJ33CAHM3_B/H provides verified halogen-free compliance and latest revision assurance - critical for automotive Tier-1 supply chains and long-lifecycle industrial deployments where material declarations and revision control are audited.
Availability
SMBJ33CAHM3_B/H is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and telecom Ethernet PHY port applications requiring stable component supply, full traceability, and halogen-free compliance.
Supply support for SMBJ33CAHM3_B/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, power efficiency, and application-specific ruggedization.
The SMBJ series targets high-energy transient suppression in space-constrained surface-mount applications, with design focus on automotive, industrial, and telecom systems demanding AEC-Q101 qualification and consistent clamping performance.
FAQ
What is the maximum clamping voltage of SMBJ33CAHM3_B/H at its rated peak pulse current?
The SMBJ33CAHM3_B/H has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 11.3 A, measured under the standard 10/1000 µs waveform condition. This value ensures protected circuitry remains within safe operating limits during surge events, and is confirmed in the Vishay SMBJ5.0A–SMBJ188A datasheet (Document Number: 88392, Rev. 09-Jan-2024). The SMBJ33CAHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ33CAHM3_B/H suitable for automotive applications?
Yes - the HM3 suffix indicates SMBJ33CAHM3_B/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified, making it suitable for automotive body electronics, infotainment interfaces, and powertrain auxiliary circuits. While the base SMBJ33CAHM3_B/H part number itself does not carry the "HE3" or "HM3_X" automotive ordering code explicitly shown in the datasheet's ordering table, Vishay confirms HM3-suffixed SMBJ devices meet AEC-Q101 when ordered with appropriate revision (e.g., _B/H). The SMBJ33CAHM3_B/H is therefore approved for under-hood and cabin applications requiring qualified surge protection.
How does the bidirectional nature of SMBJ33CAHM3_B/H affect its placement in a circuit?
The SMBJ33CAHM3_B/H has no polarity marking and functions identically in both directions, so it can be placed across any two nodes requiring symmetrical overvoltage protection - such as differential signal pairs, AC-coupled lines, or floating grounds. Unlike unidirectional TVS diodes, the SMBJ33CAHM3_B/H eliminates orientation concerns during assembly and supports protection against both positive and negative transients without additional components. This simplifies layout and reduces BOM count compared to using two unidirectional devices.
What is the thermal resistance of SMBJ33CAHM3_B/H, and how does it impact PCB layout?
The SMBJ33CAHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surge conditions, PCB layout must provide adequate copper area and avoid excessive trace length or narrow traces that increase thermal impedance. For high-duty-cycle applications, adding thermal vias beneath the SMBJ33CAHM3_B/H pads improves heat dissipation and extends device lifetime.
Does SMBJ33CAHM3_B/H meet UL 497B recognition?
Yes - the SMBJ33CAHM3_B/H is Underwriters Laboratories (UL) recognized under standard UL 497B for protectors, with file number E136766 covering both unidirectional and bidirectional variants in the SMBJ family. This recognition validates its suitability for use in telecommunications and data line protection where regulatory safety certification is required. The UL listing applies directly to the SMBJ33CAHM3_B/H as a member of the qualified SMBJ5.0A–SMBJ188A series.
SMBJ33CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- 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_B/H FAQ
1.How can I place an order for SMBJ33CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHM3_B/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_B/H reliable?
The price and inventory of SMBJ33CAHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHM3_B/H?
SMBJ33CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHM3_B/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_B/H?
For technical support, including SMBJ33CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ33CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHM3_B/H?
All SMBJ33CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ33CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHM3_B/H Tags
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