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Vishay General Semiconductor - Diodes Division SMB8J33CAHE3_B/H
- Part No.:
- SMB8J33CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHE3_B/H.pdf
- Description:
- 800W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,197
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Product details
Overview
SMB8J33CAHE3_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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J33CAHE3_B/H datasheet, SMB8J33CAHE3_B/H pinout, SMB8J33CAHE3_B/H application, or SMB8J33CAHE3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.42), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 33 V), then rapidly switches to low-impedance conduction when transients exceed VBR. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Rated for -55 °C to +150 °C operation and qualified to AEC-Q101, SMB8J33CAHE3_B/H supports automotive-grade reliability with MSL Level 1 moisture sensitivity and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin for 24 V nominal systems. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - tight breakdown window ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 53.3 V at 15 A - clamping voltage limits downstream IC stress during 10/1000 µs surges; clamping ratio = 1.42. |
| PPPM | 800 W - peak pulse power handling with 10/1000 µs waveform; enables robust protection against ISO 7637-2 Pulse 1/2a/5a. |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered nodes. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive and high-ambient industrial environments. |
| RθJA | 72 °C/W - thermal resistance informs PCB pad design; requires ≥5.0 mm × 5.0 mm copper per terminal for full derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical dual-anode/dual-cathode construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode 1 / Anode 2 | Terminal A | One end of bidirectional avalanche junction; connects to protected line (e.g., CAN_H or RS-485 A). |
| Anode 1 / Cathode 2 | Terminal B | Opposite end of same junction; connects to reference (GND or complementary line like CAN_L). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage drift over temperature and lifetime. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without preconditioning; compatible with high-volume SMT lines. |
| Low clamping ratio (VC/VBR) | 1.42 - minimizes overvoltage exposure to downstream ICs compared to higher-ratio TVS devices. |
| Halogen-free RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for automotive OEMs and industrial equipment exporters. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and ground, responding within <1 ps to limit voltage excursion. Use Value: Enables reliable operation at 150 °C ambient while meeting ISO 16750-2 and ISO 7637-2 immunity requirements without derating. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLCs exposed to EFT and surge events on long cable runs. IC Role / Device Role / Timing Role: Line-to-ground TVS on A/B differential pair, clamping common-mode surges before they reach the transceiver's ±15 kV ESD-rated inputs. Use Value: Maintains signal integrity up to 10 Mbps by limiting clamping voltage to 53.3 V while absorbing 800 W pulses. |
| Consumer Power Adapter Input | Smart Meter Communication Port |
|
Use Scenario: Secondary-side DC bus protection in USB-C PD adapters against fast transient bursts induced by nearby relay switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated shunt protector on 24 V output rail, activated only during >36.7 V excursions. Use Value: Prevents latch-up or gate oxide damage in synchronous rectifier MOSFETs and secondary-side controllers without adding series impedance. |
Use Scenario: Securing HPLC (High-Speed Power Line Communication) modem interfaces in smart electricity meters subjected to grid-switching surges and neutral-ground potential shifts. IC Role / Device Role / Timing Role: Bidirectional clamp on PLC signal coupler input, referenced to isolated power domain. Use Value: Survives repeated 10/1000 µs surges up to 800 W while maintaining <1 µA leakage to avoid interfering with sub-µA metering bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-E3/52 | Same SMB package, 33 V VWM, but rated for 600 W PPPM (vs. 800 W); unqualified for AEC-Q101. | Limited to commercial-grade industrial or consumer use; not approved for automotive front-end modules. | Select when cost sensitivity outweighs automotive qualification and 200 W power headroom. |
| SMCJ33CAHE3_A/H | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; 1500 W PPPM rating; AEC-Q101 qualified. | Requires larger PCB area (7.11 mm × 6.22 mm vs. 4.57 mm × 3.94 mm); suited for primary-side or high-surge zones. | Choose when system-level surge tests exceed 800 W or when thermal margin must be increased via larger copper footprint. |
Compared with SMBJ33CA-E3/52 and SMCJ33CAHE3_A/H, SMB8J33CAHE3_B/H uniquely balances AEC-Q101 compliance, 800 W surge capacity, and minimal SMB footprint - making it optimal for space-constrained automotive sensor nodes where both qualification and power density matter.
Availability
SMB8J33CAHE3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and smart meter communication ports requiring stable component supply and full traceability.
Supply support for SMB8J33CAHE3_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 and automotive-grade validation.
SMB8J33CAHE3_B/H belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial control systems.
FAQ
What is the clamping voltage of SMB8J33CAHE3_B/H at its rated peak pulse current?
The SMB8J33CAHE3_B/H 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_B/H qualified for automotive applications?
Yes, SMB8J33CAHE3_B/H is AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number: 88422, Revision: 09-Jan-2024). The "HE3" suffix denotes RoHS-compliant and AEC-Q101-qualified construction, enabling use in engine control units, ADAS camera modules, and body electronics where reliability under thermal cycling and vibration is mandatory.
What does the "B/H" suffix in SMB8J33CAHE3_B/H indicate?
The "B/H" suffix in SMB8J33CAHE3_B/H specifies packaging configuration: "B" denotes tape-and-reel format per EIA-481, and "H" indicates a 7″ diameter reel containing 750 units. This ordering code aligns with Vishay's preferred package code system and ensures compatibility with standard SMT pick-and-place feeders.
How does SMB8J33CAHE3_B/H differ from unidirectional variants like SMB10J33AHE3_B/H?
SMB8J33CAHE3_B/H is bidirectional with symmetrical clamping in both polarities, while SMB10J33AHE3_B/H is unidirectional and conducts only in reverse bias. The "C" in SMB8J33CAHE3_B/H explicitly denotes bidirectionality, making it suitable for AC-coupled or differential lines (e.g., CAN, RS-485), unlike the unidirectional version intended for DC rail-to-ground protection.
What is the thermal resistance and recommended PCB layout for SMB8J33CAHE3_B/H?
SMB8J33CAHE3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. To achieve rated PPPM and avoid thermal runaway, designers must implement minimum pad dimensions of 0.086″ × 0.060″ (2.18 mm × 1.52 mm) per side, per Vishay's mechanical drawing in Document 88422.
SMB8J33CAHE3_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)
SMB8J33CAHE3_B/H FAQ
1.How can I place an order for SMB8J33CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHE3_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 SMB8J33CAHE3_B/H reliable?
The price and inventory of SMB8J33CAHE3_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 SMB8J33CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHE3_B/H?
SMB8J33CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHE3_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 SMB8J33CAHE3_B/H?
For technical support, including SMB8J33CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHE3_B/H requirements.
6.How does Aetrix verify that SMB8J33CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHE3_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 SMB8J33CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHE3_B/H?
All SMB8J33CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHE3_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 SMB8J33CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMB8J33CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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