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Vishay General Semiconductor - Diodes Division SMB8J33CAHM3_B/H
- Part No.:
- SMB8J33CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHM3_B/H.pdf
- Description:
- 800W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,893
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Product details
Overview
SMB8J33CAHM3_B/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.
For engineers reviewing the SMB8J33CAHM3_B/H datasheet, SMB8J33CAHM3_B/H pinout, SMB8J33CAHM3_B/H application, or SMB8J33CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification for automotive use, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the bidirectional configuration enables symmetric clamping across both polarities without polarity sensitivity.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and delivers 800 W peak pulse power under standardized 10/1000 µs surge conditions when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse working voltage before leakage exceeds 1 µA; defines safe operating margin below clamping threshold |
| VBR min/max | 36.7 V / 40.6 V at IT = 1 mA - verified breakdown range ensuring consistent turn-on across production lots |
| VC @ IPPM | 53.3 V at 15 A - clamping voltage during full-rated 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| PPPM | 800 W - peak pulse power handling capacity; defines energy absorption limit for single-event surges |
| ID @ VWM | 1.0 µA - reverse leakage at rated stand-off voltage; critical for low-power sensor and communication line integrity |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm × 3.94 mm body and 5.59 mm length; compatible with standard SMT pick-and-place |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Current entry point during positive transient | One side of symmetrical PN junction; conducts when voltage exceeds +VC relative to cathode |
| Cathode (Terminal 2) | Current entry point during negative transient | Other side of symmetrical PN junction; conducts when voltage exceeds –VC relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC JESD201 Class 2 whisker resistance and global environmental compliance requirements |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio ≈ 1.45) and higher energy absorption efficiency vs. competing SMB TVS devices |
| MSL Level 1 rating | Supports single-reflow soldering at 260 °C peak without moisture-induced damage or delamination |
| Glass passivated junction | Ensures long-term parameter stability and reduced parameter drift under thermal and electrical stress |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensors and engine crankshaft position sensors from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across sensor supply and ground pins to divert surge energy away from analog front-end ICs. Use Value: Maintains signal integrity under 100 V/100 ms load dump events while adding <1.5 pF capacitance at 0 V bias-no timing skew on low-speed analog outputs. |
Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042) against ESD and fast transient bursts in factory automation networks. IC Role / Device Role / Timing Role: Differential-line TVS placed between CAN_H and CAN_L to clamp common-mode surges without disrupting 1 Mbps data integrity. Use Value: With 53.3 V clamping and <1 µA leakage at 33 V, it prevents transceiver latch-up while preserving bus idle voltage margins required for ISO 11898-2 compliance. |
| Consumer USB Power Delivery | Telecom DSL Line Interface |
Use Scenario: Overvoltage protection on 5 V/9 V/15 V USB PD input rails in portable docking stations and monitors. IC Role / Device Role / Timing Role: Primary-level TVS on VBUS line upstream of buck converters and port controllers to absorb IEC 61000-4-5 surges. Use Value: 800 W PPPM rating handles 10/1000 µs surges up to 1 kV open-circuit, enabling compliance with IEC 61000-4-5 Level 3 without derating at 70 °C ambient. |
Use Scenario: Surge suppression on POTS/DSL line interface circuits exposed to lightning-induced transients on outdoor copper pairs. IC Role / Device Role / Timing Role: Secondary protection device placed after gas discharge tube (GDT) to clamp residual let-through voltage to safe levels for line driver ICs. Use Value: 33 V VWM allows integration with 24 V nominal line interface supplies; 53.3 V VC limits stress on downstream op-amps and ADCs during 6 kV/3 kA telecom surge tests. |
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/H | Same electrical specs, but RoHS-compliant without halogen-free certification (E3 vs HM3) | Approved for commercial/industrial use; not qualified for automotive AEC-Q101 | Select when halogen-free requirement is absent and automotive qualification is unnecessary |
| SMBJ33CAHM3 | Unidirectional variant (cathode-banded); same VWM, VBR, VC, and PPPM ratings | Requires polarity-aware layout; unsuitable for differential or AC-coupled lines | Choose only for unidirectional DC rail protection where polarity is fixed and known |
Compared with SMB8J33CAHM3_B/H, the HE3 variant lacks AEC-Q101 validation and halogen-free status, while the SMBJ33CAHM3 requires strict polarity orientation and cannot protect bidirectional signals-making SMB8J33CAHM3_B/H the sole choice for automotive-grade, polarity-agnostic, halogen-free surge suppression.
Availability
SMB8J33CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, USB PD power adapters, and telecom line interfaces requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMB8J33CAHM3_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, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive qualification.
The SMB8JxxCA series targets high-reliability transient suppression in space-constrained automotive and industrial systems, delivering AEC-Q101-qualified bidirectional TVS performance in the compact SMB footprint.
FAQ
What does the "HM3" suffix indicate in SMB8J33CAHM3_B/H?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction meeting JEDEC JESD201 Class 2 whisker resistance requirements, and confirms AEC-Q101 qualification for automotive applications. SMB8J33CAHM3_B/H is fully validated for under-hood deployment and complies with global environmental regulations without compromising electrical performance.
Is SMB8J33CAHM3_B/H suitable for protecting CAN FD interfaces?
Yes-SMB8J33CAHM3_B/H is appropriate for CAN FD physical layer protection due to its 53.3 V clamping voltage, low leakage (<1 µA at 33 V), and bidirectional symmetry. Its <1.5 pF junction capacitance at 0 V bias avoids signal integrity degradation at 5 Mbps CAN FD data rates when placed across the differential pair.
How does SMB8J33CAHM3_B/H differ from SMBJ33CAHM3?
SMB8J33CAHM3_B/H is bidirectional with no polarity marking, while SMBJ33CAHM3 is unidirectional and marked with a cathode band. Both share identical VWM (33 V), VBR (36.7–40.6 V), and PPPM (800 W), but SMB8J33CAHM3_B/H supports AC-coupled and differential signal lines where polarity reversal occurs, unlike SMBJ33CAHM3.
What is the recommended PCB pad layout for SMB8J33CAHM3_B/H?
Vishay specifies minimum 5.0 mm × 5.0 mm copper pads per terminal for optimal thermal dissipation and surge current handling. The SMB8J33CAHM3_B/H datasheet (Fig. 2) shows derating curves confirming 800 W PPPM is only guaranteed with this pad area; smaller pads reduce surge capability proportionally and increase junction temperature rise during repetitive events.
Does SMB8J33CAHM3_B/H meet IEC 61000-4-5 Level 4 requirements?
SMB8J33CAHM3_B/H supports IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line) when used with proper system-level design-including coordinated upstream GDT or MOV staging and impedance-matched PCB routing. Its 800 W PPPM and 53.3 V clamping enable robust secondary protection, but system-level validation remains the designer's responsibility.
SMB8J33CAHM3_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:
- 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/H FAQ
1.How can I place an order for SMB8J33CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHM3_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 SMB8J33CAHM3_B/H reliable?
The price and inventory of SMB8J33CAHM3_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 SMB8J33CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHM3_B/H?
SMB8J33CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHM3_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 SMB8J33CAHM3_B/H?
For technical support, including SMB8J33CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHM3_B/H requirements.
6.How does Aetrix verify that SMB8J33CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHM3_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 SMB8J33CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHM3_B/H?
All SMB8J33CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHM3_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 SMB8J33CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMB8J33CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CAHM3_B/H Tags
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