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Vishay General Semiconductor - Diodes Division SMB8J33CAHM3/I
- Part No.:
- SMB8J33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHM3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,972
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Product details
Overview
SMB8J33CAHM3/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) 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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J33CAHM3/I datasheet, SMB8J33CAHM3/I pinout, SMB8J33CAHM3/I application, or SMB8J33CAHM3/I equivalent, this device delivers AEC-Q101-qualified transient suppression for bidirectional signal paths where low-leakage (<1 µA at VWM), fast response (<1 ns), and halogen-free RoHS compliance are required in space-constrained surface-mount designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal lines without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±10%) and low incremental surge resistance, critical for consistent clamping under repetitive transients.
Rated for -55 °C to +150 °C junction temperature and qualified to AEC-Q101, the SMB8J33CAHM3/I supports automotive-grade reliability with MSL Level 1 moisture sensitivity and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe working range for protected circuitry. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - tight breakdown window ensures predictable turn-on during surges while minimizing false triggering. |
| VC @ IPPM | 53.3 V at 15 A - clamping voltage limits downstream voltage stress during 10/1000 µs transients, protecting ICs rated ≤55 V. |
| PPPM | 800 W - peak pulse power handling capability with 10/1000 µs waveform; enables robust protection against ISO 7637-2 Pulse 1/2a/5a events. |
| IR @ VWM | <1 µA - ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - extended thermal rating supports under-hood automotive placement and high-ambient industrial environments. |
| Package | SMB (DO-214AA) - standardized 2-pin SMD outline with 5.59 mm × 3.94 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking - symmetrical terminals function identically as anode/cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode or Cathode (bidirectional) | Either terminal serves as current entry point during positive or negative transients; no color band or marking required. |
| Terminal 2 | Anode or Cathode (bidirectional) | Complementary terminal completing symmetrical conduction path; enables clamp-to-rail protection on AC or differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment I/O - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JEDEC JS709E; eliminates brominated flame retardants without compromising UL 94 V-0 molding compound performance. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage exposure during surge events - critical for safeguarding 3.3 V/5 V/12 V logic interfaces and analog front-ends. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without pre-baking; supports high-volume manufacturing with standard SMT profiles. |
| Glass-passivated junction | Ensures long-term parameter stability and resistance to humidity-induced degradation - essential for 15+ year automotive service life. |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD transceiver inputs and LIN bus lines from load dump and inductive switching transients in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, responding within <1 ns to limit voltage excursion to ≤53.3 V. Use Value: Prevents latch-up or permanent damage to transceivers rated for 55 V absolute maximum, enabling compliance with ISO 16750-2 and ISO 7637-2 test pulses. |
Use Scenario: Shielding PLC digital input channels from field-side surges induced by relay coil de-energization or lightning coupling in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-mode protector installed across input terminals, conducting only during >33 V transients to shunt energy to common ground. Use Value: Maintains ≤1 µA leakage at 24 V DC nominal, avoiding false triggering of optocoupler-based input stages while surviving 800 W surge events. |
| USB 2.0 Data Line Protection | Automotive Camera Power Rail Protection |
|
Use Scenario: Safeguarding D+/D- differential pair in rear-view camera modules against ESD and cable discharge events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed in parallel with USB data lines, clamping ±8 kV contact discharge to <53.3 V. Use Value: Junction capacitance <100 pF (typ.) preserves signal integrity up to 480 Mbps without eye diagram distortion or timing jitter. |
Use Scenario: Suppressing load dump transients on 12 V power rail feeding MIPI CSI-2 camera modules in ADAS systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on power input, activated when rail exceeds 33 V due to alternator regulation failure. Use Value: Withstands 800 W peak power for 10 ms duration (per ISO 7637-2 Pulse 5a), preventing brownout or reset of image sensor ASICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J33CAHE3/I | Same electrical specs, but RoHS-compliant with brominated flame retardant (non-halogen-free); lacks HM3 halogen-free certification. | Acceptable for commercial/industrial use where halogen-free mandate does not apply; not approved for automotive OEM Tier 1 supply chains requiring IEC 61249-2-21 compliance. | Select SMB8J33CAHE3/I only if halogen-free requirement is waived and cost optimization is prioritized over automotive qualification scope. |
| SMC8J33CAHM3 | Same VWM/VBR/VC ratings, but in larger SMC (DO-214AB) package - 7.11 mm × 6.22 mm vs. SMB's 5.59 mm × 3.94 mm; higher PPPM (1500 W). | Better suited for high-energy industrial motor drives where PCB space allows and surge immunity beyond 800 W is needed; not drop-in compatible due to footprint mismatch. | Choose SMC8J33CAHM3 when system-level surge testing exceeds 800 W or when thermal dissipation margin requires lower RθJA (35 °C/W vs. SMB's 72 °C/W). |
Compared with SMB8J33CAHE3/I, the SMB8J33CAHM3/I adds halogen-free compliance for automotive Tier 1 sourcing; versus SMC8J33CAHM3, it trades 700 W peak power headroom for 40% smaller board area and identical AEC-Q101 qualification - optimizing for space-constrained ADAS sensor nodes.
Availability
SMB8J33CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB 2.0 peripheral protection, and ADAS camera power rail applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J33CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for AEC-Q101-compliant transient suppression in automotive and harsh-environment industrial systems where bidirectional clamping and halogen-free compliance are mandatory.
FAQ
What is the clamping voltage of SMB8J33CAHM3/I at its rated peak pulse current?
The SMB8J33CAHM3/I has a maximum clamping voltage (VC) of 53.3 V at 15 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with downstream ICs rated for ≤55 V absolute maximum.
Is SMB8J33CAHM3/I suitable for automotive applications?
Yes, SMB8J33CAHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including body electronics, ADAS sensors, and infotainment interfaces. Its -55 °C to +150 °C operating range and MSL Level 1 rating further support under-hood and module-level deployment.
Does SMB8J33CAHM3/I have polarity markings on the package?
No, SMB8J33CAHM3/I is a bidirectional TVS diode and carries no polarity marking such as a cathode band. Both terminals are functionally identical and conduct symmetrically during positive or negative transients - simplifying layout and eliminating orientation errors during automated assembly.
What is the maximum reverse leakage current of SMB8J33CAHM3/I at its standoff voltage?
At its 33 V standoff voltage (VWM), the SMB8J33CAHM3/I exhibits a maximum reverse leakage current (ID) of 1 µA at 25 °C. This ultra-low leakage preserves signal fidelity in high-impedance sensor interfaces and minimizes standby power loss in battery-powered automotive modules.
How does the SMB8J33CAHM3/I differ from unidirectional variants like SMB10J33A?
Unlike unidirectional SMB10J33A, the SMB8J33CAHM3/I provides symmetrical clamping for both polarities - essential for AC-coupled, differential, or floating signal lines. It also offers lower peak pulse power (800 W vs. 1000 W) and reduced IPPM (15 A vs. 18.8 A), reflecting its optimized bidirectional architecture rather than a simple polarity variant.
SMB8J33CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMB8J33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHM3/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/I reliable?
The price and inventory of SMB8J33CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHM3/I?
SMB8J33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHM3/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/I?
For technical support, including SMB8J33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHM3/I requirements.
6.How does Aetrix verify that SMB8J33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHM3/I?
All SMB8J33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMB8J33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CAHM3/I Tags
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