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Vishay General Semiconductor - Diodes Division SMB8J33CAHM3_B/I
- Part No.:
- SMB8J33CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHM3_B/I.pdf
- Description:
- 800W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,275
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Product details
Overview
SMB8J33CAHM3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 53.3 V clamping voltage (VC) at 15 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMB8J33CAHM3_B/I datasheet, SMB8J33CAHM3_B/I pinout, SMB8J33CAHM3_B/I application, or SMB8J33CAHM3_B/I equivalent, this device is selected for automotive-grade ESD/surge protection where AEC-Q101 qualification, low clamping ratio, and halogen-free RoHS compliance are required.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, enabling robust protection against voltage transients induced by inductive switching, ESD, and lightning surges without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive stress.
Designed for surface-mount automated assembly, it meets MSL level 1 per J-STD-020 (peak reflow 260 °C), supports 150 °C maximum junction temperature, and delivers thermal resistance of 72 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 36.7 V / 40.6 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 53.3 V - Clamped voltage seen by protected circuit during 15 A 10/1000 µs surge |
| PPPM | 800 W - Peak transient power dissipation capability with standardized surge waveform |
| ID @ VWM | 1.0 µA - Reverse leakage at rated standoff voltage, ensuring minimal standby power loss |
| TJ max | +150 °C - Maximum junction temperature rating, supporting under-hood automotive use |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking (unlike unidirectional variants which feature cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage above ±53.3 V regardless of polarity |
| Case (body) | Thermal and mechanical interface | Plastic body transfers heat to PCB copper pads; no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring long-term field reliability |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and enables use in green manufacturing supply chains |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream ICs during surge events compared to higher-ratio TVS devices |
| MSL Level 1 rating | Allows direct placement into standard SMT reflow profiles without baking or special handling |
Applications
| Automotive CAN Bus Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L differential pair in vehicle ECUs against load dump and ESD events. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed directly at connector entry point to shunt surge energy before transceiver input. Use Value: Maintains signal integrity by limiting transient voltage to ≤53.3 V while surviving 800 W surges per ISO 16750-2 Pulse 5a. | Use Scenario: Safeguarding analog output (4–20 mA) or digital I/O lines of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on sensor signal line, referenced to local ground plane. Use Value: Prevents latch-up or damage to ADC inputs during cable discharge events with <1.0 µA leakage at 33 V. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge suppression stage ahead of secondary filtering and TVS array. Use Value: Absorbs up to 800 W of 10/1000 µs energy while maintaining ≤53.3 V clamping to preserve transceiver functionality. | Use Scenario: Adding robust ESD immunity to USB 2.0 data lines (D+/D−) in portable medical monitors. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to USB connector pins. Use Value: Provides ±15 kV contact ESD protection per IEC 61000-4-2 without distorting high-speed data signals due to symmetrical clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J33CAHE3_B/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial/industrial designs where halogen content is unrestricted | Select when halogen-free requirement is absent and cost optimization is prioritized |
| SMAJ33CAHM3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), identical VWM/VBR/VC ratings | Suitable for space-constrained layouts with lower surge exposure (e.g., consumer USB ports) | Choose for footprint reduction where 400 W surge margin suffices and board area is critical |
Compared with SMB8J33CAHM3_B/I, SMB8J33CAHE3_B/I offers identical performance without halogen-free assurance, while SMAJ33CAHM3_A/I trades 50 % peak power capacity for 30 % smaller footprint-enabling layout flexibility where full 800 W rating is not mandated.
Availability
SMB8J33CAHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom infrastructure requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMB8J33CAHM3_B/I 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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge suppression in harsh environments including automotive and industrial systems.
FAQ
What does the "HM3" suffix indicate in SMB8J33CAHM3_B/I?
The HM3 suffix denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification. It confirms that SMB8J33CAHM3_B/I meets automotive reliability standards while using environmentally compliant materials-critical for Tier 1 suppliers and green manufacturing programs. This distinguishes it from E3 (RoHS only) and HE3 (AEC-Q101, non-halogen-free) variants of the same device.
Is SMB8J33CAHM3_B/I unidirectional or bidirectional?
SMB8J33CAHM3_B/I is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Unlike unidirectional versions (e.g., SMB8J33A), it has no cathode marking and protects AC-coupled or floating lines without polarity constraints-making SMB8J33CAHM3_B/I ideal for differential bus protection like CAN or RS-485.
What is the clamping voltage of SMB8J33CAHM3_B/I and why does it matter?
The clamping voltage (VC) of SMB8J33CAHM3_B/I is 53.3 V at 15 A peak pulse current (10/1000 µs). This value defines the maximum voltage imposed on the protected circuit during a surge event. A lower VC relative to VBR (clamping ratio ≈ 1.38) ensures downstream components such as transceivers or microcontrollers experience minimal overvoltage stress-directly improving system-level robustness in automotive and industrial applications.
Can SMB8J33CAHM3_B/I be used in place of a unidirectional TVS like SMB10J33A?
No-SMB8J33CAHM3_B/I is not a drop-in replacement for unidirectional devices like SMB10J33A. While both share similar VWM (33 V) and VBR ranges, SMB8J33CAHM3_B/I is bidirectional with no polarity marking and 800 W PPPM, whereas SMB10J33A is unidirectional with 1000 W PPPM and a cathode band. Substituting SMB8J33CAHM3_B/I requires verifying that bidirectional operation and reduced peak power meet the design's surge profile and layout constraints.
What PCB pad layout is recommended for optimal thermal performance of SMB8J33CAHM3_B/I?
Vishay specifies mounting SMB8J33CAHM3_B/I on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the rated 800 W PPPM and 72 °C/W RθJA. Reducing pad size degrades thermal dissipation and reduces surge capability. For high-reliability automotive use, internal copper planes and thermal vias beneath the pads are recommended to further lower junction temperature during repeated transients.
SMB8J33CAHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- 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:
- 33V
- Current - Peak Pulse (10/1000µs):
- 15A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J33CAHM3_B/I FAQ
1.How can I place an order for SMB8J33CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHM3_B/I 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 SMB8J33CAHM3_B/I reliable?
The price and inventory of SMB8J33CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J33CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHM3_B/I?
SMB8J33CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHM3_B/I 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 SMB8J33CAHM3_B/I?
For technical support, including SMB8J33CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHM3_B/I requirements.
6.How does Aetrix verify that SMB8J33CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHM3_B/I 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 SMB8J33CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHM3_B/I?
All SMB8J33CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHM3_B/I, 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 SMB8J33CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMB8J33CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CAHM3_B/I Tags
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Diodes Incorporated
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