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Vishay General Semiconductor - Diodes Division SMB8J33CAHM3_A/H
- Part No.:
- SMB8J33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHM3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,097
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Product details
Overview
SMB8J33CAHM3_A/H 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 stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 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. It is AEC-Q101 qualified and halogen-free, targeting automotive sensor interface and power rail protection.
For engineers reviewing the SMB8J33CAHM3_A/H datasheet, SMB8J33CAHM3_A/H pinout, SMB8J33CAHM3_A/H application, or SMB8J33CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, 33 V working voltage compatibility with 3.3 V/5 V/12 V systems, thermal resistance (RθJL = 20 °C/W), and compliance with IEC 61000-4-2/4-4/4-5 surge immunity standards.
Technical Context
This device operates as a voltage-clamping TVS diode using an avalanche junction structure to divert transient energy away from sensitive downstream circuitry. Its bidirectional configuration enables symmetrical suppression of both positive and negative polarity transients without polarity dependency.
It delivers 800 W peak pulse power handling per 10/1000 μs waveform under standard mounting conditions (0.2" × 0.2" copper pads), with clamping voltage tightly controlled at ≤53.3 V up to 15 A IPPM and reverse leakage <1.0 μA at 33 V VWM. Junction temperature range spans −55 °C to +150 °C, supporting under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates; matches 3.3 V/5 V/12 V bus rails with safety margin |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - ensures reliable turn-on above normal operating voltage while avoiding false triggering |
| VC @ IPPM | 53.3 V at 15 A - limits downstream voltage stress during 800 W transient events, protecting 33 V-rated ICs |
| PPPM | 800 W (10/1000 μs) - sustains high-energy surges common in automotive load-dump and ISO 7637-2 Pulse 5a scenarios |
| RθJL | 20 °C/W - enables efficient heat transfer to PCB copper, critical for sustained surge duty cycles in compact layouts |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly; JEDEC-standardized mechanical outline |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient current return path (bidirectional) | No polarity marking; symmetric terminals allow either orientation in PCB layout for differential or single-ended protection |
| Anode (Cathode) | Transient current return path (bidirectional) | Identical electrical role to opposite terminal; bidirectional operation eliminates need for orientation-aware placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment power domains |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and supports lead-free reflow soldering without compromising surge performance |
| Low incremental surge resistance | Enables tighter clamping voltage control under high-current transients, reducing voltage overshoot on protected nodes |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak, simplifying manufacturing logistics |
| Glass passivated junction | Improves long-term reliability and stability of VBR and leakage parameters across temperature and lifetime |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Transceiver Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN FD transceivers and analog sensor inputs (e.g., pressure, temperature) from ESD and load-dump induced transients in vehicle cabins and powertrain zones. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector or IC input pins to shunt surge energy before it reaches transceiver ESD structures. Use Value: Maintains signal integrity by limiting transient voltage to ≤53.3 V, preventing latch-up or permanent damage to 33 V-tolerant transceivers like TCAN1042 or TJA1044. |
Use Scenario: Safeguarding industrial CAN nodes against repetitive surges from motor drives, relay switching, and ground potential differences in factory automation networks. IC Role / Device Role / Timing Role: Primary line-side TVS on CAN_H/CAN_L differential pair, absorbing ±1 kV/500 A IEC 61000-4-5 surges without degradation. Use Value: Sustains 800 W peak pulse power with <1.0 μA leakage at 33 V, ensuring minimal impact on CAN bus DC bias and signal rise/fall times. |
| DC Power Rail Surge Suppression | Consumer USB Type-C Port Protection |
|
Use Scenario: Clamping 12 V/24 V supply rails in telematics modules and body control units exposed to ISO 7637-2 Pulse 1, 2a, 3a/b, and 5a transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor to clamp overvoltage spikes before they propagate to downstream DC/DC converters and microcontrollers. Use Value: Delivers 53.3 V clamping at 15 A with RθJL = 20 °C/W, enabling rapid thermal dissipation during multi-pulse surge events without thermal runaway. |
Use Scenario: Protecting USB Type-C CC, VBUS, and SBU lines in portable docking stations and automotive infotainment hubs from ESD and hot-swap transients. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to connector to suppress ±15 kV contact ESD (IEC 61000-4-2) without distorting high-speed data signals. Use Value: Achieves <1.0 μA leakage at 33 V and fast response time (<1 ns), preserving USB 2.0 signal integrity while meeting automotive EMC requirements. |
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_A/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); no halogen-free certification | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated | Select when cost sensitivity outweighs automotive qualification requirements and halogen-free material is not required |
| SMAJ33CA | Same VWM/VBR/VC ratings but in smaller SMA (DO-214AC) package; lower PPPM (400 W) and higher RθJA (110 °C/W) | Lower power handling and reduced thermal performance limit use to low-duty-cycle or non-automotive applications | Choose only for space-constrained PCBs where 400 W surge capability suffices and AEC-Q101 is unnecessary |
Compared with SMB8J33CAHE3_A/H and SMAJ33CA, SMB8J33CAHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, and 800 W surge capacity in the SMB footprint-making it the only option among the three validated for under-hood automotive deployment with full regulatory compliance.
Availability
SMB8J33CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, DC power rail surge suppression, and consumer USB Type-C port protection requiring stable component supply across production lifecycles.
Supply support for SMB8J33CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and power efficiency.
The SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial systems, engineered specifically to meet AEC-Q101 and IEC 61000-4-x immunity standards while maintaining low leakage and tight clamping tolerance.
FAQ
What is the clamping voltage of SMB8J33CAHM3_A/H at its rated peak pulse current?
The SMB8J33CAHM3_A/H has a maximum clamping voltage (VC) of 53.3 V at 15 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value ensures protected circuits remain below critical voltage thresholds during standardized surge events. The SMB8J33CAHM3_A/H maintains this clamping performance across its full operating temperature range of −55 °C to +150 °C.
Is SMB8J33CAHM3_A/H suitable for automotive applications?
Yes, SMB8J33CAHM3_A/H is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units, ADAS sensors, and infotainment systems. Its halogen-free, RoHS-compliant construction and validation across temperature cycling, HTRB, and ESD tests confirm suitability for under-hood and cabin environments. The SMB8J33CAHM3_A/H meets ISO 7637-2 and IEC 61000-4-5 surge immunity requirements.
What is the difference between SMB8J33CAHM3_A/H and SMB8J33CAHE3_A/H?
SMB8J33CAHM3_A/H is halogen-free and AEC-Q101 qualified, whereas SMB8J33CAHE3_A/H is RoHS-compliant but lacks AEC-Q101 qualification and halogen-free certification. Both share identical electrical specifications (VWM = 33 V, VC = 53.3 V, PPPM = 800 W) and SMB packaging. The SMB8J33CAHM3_A/H is mandatory for automotive Tier 1 suppliers requiring full material compliance and qualification evidence.
Does SMB8J33CAHM3_A/H have polarity markings on the package?
No, SMB8J33CAHM3_A/H is a bidirectional TVS diode and carries no polarity marking on the SMB (DO-214AA) package. Its symmetrical terminal structure allows installation in either orientation on the PCB, simplifying layout and eliminating risk of reverse placement. This design feature supports differential line protection and reduces assembly errors in high-volume automotive manufacturing.
What is the thermal resistance from junction to lead (RθJL) for SMB8J33CAHM3_A/H?
The SMB8J33CAHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, enabling efficient heat conduction from the silicon die to the PCB copper via the device leads. This low RθJL supports repeated surge events without thermal saturation and complements the SMB package's ability to handle 800 W peak pulse power. Thermal performance is verified under standard mounting conditions (0.2" × 0.2" copper pads).
SMB8J33CAHM3_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):
- 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_A/H FAQ
1.How can I place an order for SMB8J33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHM3_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 SMB8J33CAHM3_A/H reliable?
The price and inventory of SMB8J33CAHM3_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 SMB8J33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHM3_A/H?
SMB8J33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHM3_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 SMB8J33CAHM3_A/H?
For technical support, including SMB8J33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHM3_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 SMB8J33CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHM3_A/H?
All SMB8J33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHM3_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 SMB8J33CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMB8J33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CAHM3_A/H Tags
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