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Vishay General Semiconductor - Diodes Division SMB8J33CAHE3/5B
- Part No.:
- SMB8J33CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHE3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,030
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Product details
Overview
SMB8J33CAHE3/5B 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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J33CAHE3/5B datasheet, SMB8J33CAHE3/5B pinout, SMB8J33CAHE3/5B application, or SMB8J33CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a silicon avalanche diode with glass-passivated junction, delivering fast response (<1 ns) to ESD and lightning-induced transients. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity concerns, and its low incremental surge resistance ensures minimal voltage overshoot during high-current surges.
The SMB8J33CAHE3/5B is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 72 °C/W and RθJL = 20 °C/W. It meets ANSI/IEEE C62.35 standards and is qualified to AEC-Q101 for automotive under-hood and chassis applications.
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 at 1 mA - guaranteed breakdown threshold defining turn-on consistency |
| VC @ IPPM | 53.3 V at 15 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 800 W - peak transient energy absorption capacity under standardized waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with IPC-7351B standard pad layout |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (peak reflow 260 °C). Polarity: bidirectional - no cathode marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - enables connection across any two-point voltage node without orientation constraints |
| Case (body) | Thermal and mechanical interface | No electrical connection; provides mechanical anchoring and heat dissipation via PCB copper pads (0.2" × 0.2") |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JESD47 |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure |
| Low clamping ratio (VC/VWM) | 1.62 - minimizes overvoltage exposure to protected ICs compared to alternatives with ratios >1.8 |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead |
| Halogen-free RoHS-compliant | Meets JEDEC J-STD-609A Class 1 definition, supporting environmental compliance in EU and Asia markets |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing transients before they reach the PHY layer. Use Value: Maintains signal integrity during 12 V/24 V system surges up to 800 W, enabling compliance with automotive EMC requirements. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from relay coils and motor drives. IC Role / Device Role / Timing Role: Primary front-end TVS on dry-contact or opto-isolated inputs, shunting energy before it reaches isolation barrier or MCU GPIO. Use Value: Withstands repeated 15 A 10/1000 µs surges while holding clamping voltage below 53.3 V - preserving input stage reliability. |
| Telecom Line Interface | Consumer USB/Display Port ESD Guard |
Use Scenario: Transient suppression on RS-485/RS-422 differential pairs in base station backhaul and network equipment. IC Role / Device Role / Timing Role: Common-mode TVS across A/B lines, leveraging bidirectional symmetry to handle polarity-agnostic surges. Use Value: Delivers <1 ns response and 53.3 V clamping to prevent latch-up in transceivers during lightning-induced common-mode events. |
Use Scenario: Board-level ESD protection for USB 2.0 data lines and DisplayPort AUX channels in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100 pF at 0 V) bidirectional clamp placed adjacent to connector pins. Use Value: Limits ESD voltage to <53.3 V while adding negligible signal distortion - meeting IEC 61000-4-2 Level 4 (±15 kV air) 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 |
|---|---|---|---|
| SMBJ33CA-E3/5B | Same SMB package and 33 V VWM, but lower PPPM (600 W) and higher VC (57.5 V); not AEC-Q101 qualified | Limited to commercial-grade industrial or consumer use; unsuitable for automotive qualification programs | Select when cost sensitivity outweighs automotive compliance and 800 W surge margin |
| 1.5SMC33CA | Higher power (1500 W PPPM), larger SMC (DO-214AB) package, same VWM/VC specs; AEC-Q101 available only in HE3 variant | Requires larger PCB area and different pad layout; better suited for high-energy industrial mains-side protection | Choose when system-level surge testing exceeds 800 W or thermal dissipation demands lower RθJA |
Compared with SMBJ33CA-E3/5B and 1.5SMC33CA, SMB8J33CAHE3/5B uniquely balances AEC-Q101 qualification, 800 W surge rating, and SMB footprint - making it optimal for space-constrained automotive and industrial edge nodes where qualification and reliability are non-negotiable.
Availability
SMB8J33CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line drivers, and consumer interface protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMB8J33CAHE3/5B 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, power efficiency, and application-specific performance.
The SMB8J series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J33CAHE3/5B at its rated peak pulse current?
The SMB8J33CAHE3/5B has a maximum clamping voltage (VC) of 53.3 V at 15 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMB8J33CAHE3/5B suitable for automotive applications?
Yes, SMB8J33CAHE3/5B is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It undergoes stress testing including temperature cycling, high-temperature reverse bias, and ESD per JESD47, and is rated for operation from -55 °C to +150 °C - meeting requirements for engine control units, ADAS sensors, and body electronics.
How does the bidirectional design of SMB8J33CAHE3/5B affect its circuit implementation?
The bidirectional architecture of SMB8J33CAHE3/5B eliminates polarity dependency - both terminals are functionally identical, allowing placement across any two-node voltage differential without regard to orientation. This simplifies layout on differential buses like RS-485 or CAN, avoids assembly errors, and supports AC-coupled signal paths where voltage polarity reverses during normal operation.
What is the thermal resistance of SMB8J33CAHE3/5B, and how does it impact PCB layout?
SMB8J33CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. To achieve rated power dissipation, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - underscoring the need for adequate copper area and thermal vias in high-surge applications to prevent thermal runaway.
Does SMB8J33CAHE3/5B meet RoHS and halogen-free requirements?
Yes, SMB8J33CAHE3/5B carries the "HE3" suffix, indicating it is RoHS-compliant and AEC-Q101 qualified. While not explicitly labeled "HM3", Vishay documentation confirms HE3 parts meet JESD201 Class 2 whisker resistance and are halogen-free per IEC 61249-2-21 - satisfying environmental compliance for EU, China, and Japan markets.
SMB8J33CAHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J33CAHE3/5B FAQ
1.How can I place an order for SMB8J33CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHE3/5B 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 SMB8J33CAHE3/5B reliable?
The price and inventory of SMB8J33CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J33CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHE3/5B?
SMB8J33CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHE3/5B 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 SMB8J33CAHE3/5B?
For technical support, including SMB8J33CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J33CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHE3/5B 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 SMB8J33CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHE3/5B?
All SMB8J33CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHE3/5B, 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 SMB8J33CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J33CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CAHE3/5B Tags
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