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Vishay General Semiconductor - Diodes Division SMB8J28CAHE3_B/H
- Part No.:
- SMB8J28CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHE3_B/H.pdf
- Description:
- 800W,28V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J28CAHE3_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 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V clamping voltage (VC) at 17.6 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 SMB8J28CAHE3_B/H datasheet, SMB8J28CAHE3_B/H pinout, SMB8J28CAHE3_B/H application, or SMB8J28CAHE3_B/H equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), 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, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping under repetitive 10/1000 μs surges up to 17.6 A.
Designed for bidirectional operation, SMB8J28CAHE3_B/H has no polarity marking and symmetrical breakdown in both directions. It meets MSL Level 1 per J-STD-020, supports peak reflow at 260 °C, and maintains full functionality across -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe interface voltage for 24 V automotive systems. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - tight breakdown window ensures predictable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 45.4 V at 17.6 A - clamping voltage limits downstream IC stress during 800 W transient; critical for protecting 3.3 V/5 V logic behind level-shifting circuits. |
| PPPM | 800 W (10/1000 μs) - energy-handling capacity sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| TJ max | +150 °C - enables use in under-hood automotive environments and thermally constrained industrial enclosures without derating. |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance allows efficient heat transfer to PCB copper, supporting sustained surge duty cycles. |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM, confirming reliability in vehicle ECUs. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional, unmarked case (no cathode band). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | No polarity distinction - either terminal serves as input/output; enables placement flexibility on differential or AC-coupled lines. |
| Case / Body | Thermal and mechanical interface | Exposed metal slug not electrically active; provides primary thermal conduction path to PCB copper pads (0.2" × 0.2") per datasheet layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability - supports deployment in ADAS sensors, body control modules, and infotainment power rails without additional qualification effort. |
| Low RθJL (20 °C/W) | Enables higher surge repetition rates and longer thermal survival time versus standard SMB TVS diodes; reduces need for oversized copper pours. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under humidity, temperature cycling, and bias stress - critical for 15-year automotive service life. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak - compatible with standard lead-free SMT assembly lines without baking or special handling. |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive housings, eliminating need for secondary flame-retardant conformal coating. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/FlexRay transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in engine control units. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector entry point, limiting transient voltage before it reaches signal conditioning circuitry. Use Value: Clamps 800 W surges to ≤45.4 V while maintaining <1 μA leakage at 28 V - preserves signal integrity and prevents false triggering in 12 V/24 V systems. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field devices subject to relay coil flyback and lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on each channel, mounted adjacent to terminal block to intercept transients before optocoupler or MCU GPIO. Use Value: Withstands repeated 10/1000 μs pulses up to 17.6 A without parameter shift - extends maintenance intervals and avoids channel failure in factory automation. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Surge suppression on Ethernet PHY power rails (e.g., PoE midspan injectors) exposed to induced surges from nearby AC wiring or antenna coupling. IC Role / Device Role / Timing Role: Secondary-level protection after gas discharge tube (GDT), providing fast clamping response (<1 ps) to complement slower primary protectors. Use Value: 45.4 V clamping voltage ensures safe operation of 3.3 V/5 V PHY ICs even during combined-mode surges defined in IEC 61000-4-5. |
Use Scenario: Output-side transient protection in USB-C PD adapters and multi-port chargers where 20 V output rails require robustness against hot-plug and cable ESD events. IC Role / Device Role / Timing Role: Final-stage clamp between DC-DC converter output and USB port connector, minimizing voltage overshoot during fault conditions. Use Value: 28 V VWM aligns precisely with 20 V PD profiles plus margin; 800 W PPPM handles worst-case capacitive discharge surges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J28CAHM3_B/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | Required where halogen-free material compliance is mandated (e.g., EU automotive Tier 1 supply chains). | Select when environmental compliance mandates halogen-free construction; otherwise functionally interchangeable with SMB8J28CAHE3_B/H. |
| SMAJ28CA-E3/5B | Same VWM/VBR/VC ratings but in smaller SMA (DO-214AC) package; lower PPPM (400 W) and IPPM (12.3 A); RθJL = 30 °C/W. | Suitable only for lower-energy transients (IEC 61000-4-2 Level 4 ESD, not ISO 7637-2 Pulse 5a). | Choose for space-constrained designs where 400 W surge capability suffices; avoid in automotive power-line or industrial I/O applications requiring 800 W. |
Compared with SMB8J28CAHE3_B/H, SMB8J28CAHM3_B/H offers identical performance with halogen-free materials, while SMAJ28CA-E3/5B trades 50% lower surge capacity and higher thermal resistance for 30% smaller footprint - making SMB8J28CAHE3_B/H optimal for AEC-Q101-compliant, high-energy protection where board area permits SMB packaging.
Availability
SMB8J28CAHE3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, telecom line interfaces, and consumer power adapter outputs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J28CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade validation.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J28CAHE3_B/H at its rated peak pulse current?
The SMB8J28CAHE3_B/H has a maximum clamping voltage (VC) of 45.4 V at its specified peak pulse current (IPPM) of 17.6 A, measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and ensures downstream circuitry remains within safe voltage limits during surge events. The SMB8J28CAHE3_B/H achieves this with low incremental surge resistance, contributing to repeatable clamping performance.
Is SMB8J28CAHE3_B/H suitable for automotive applications?
Yes, SMB8J28CAHE3_B/H is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units, ADAS sensors, and body electronics. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and operation up to +150 °C junction temperature - all verified per AEC stress test requirements. The SMB8J28CAHE3_B/H also meets ISO 7637-2 and IEC 61000-4-5 surge immunity standards when applied per Vishay's recommended PCB layout.
How does the SMB8J28CAHE3_B/H differ from unidirectional variants like SMB10J28AHE3_B/H?
The SMB8J28CAHE3_B/H is bidirectional with symmetrical breakdown characteristics in both polarities and no cathode marking, whereas SMB10J28AHE3_B/H is unidirectional, features a cathode band, and supports 1000 W PPPM (vs. 800 W). The SMB8J28CAHE3_B/H is intended for AC-coupled or differential signal lines (e.g., CAN, RS-485), while SMB10J28AHE3_B/H suits DC power rail protection where polarity is fixed. Both share identical VWM (28 V) and VC (45.4 V), but differ in surge current rating and application topology.
What is the thermal resistance from junction to lead (RθJL) for SMB8J28CAHE3_B/H?
The SMB8J28CAHE3_B/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, measured under standard conditions with 0.2" × 0.2" copper pads per terminal. This low value enables efficient heat dissipation into the PCB during repetitive surge events, reducing thermal stress and extending device lifetime compared to alternatives with higher RθJL. For thermal design, this value must be used in conjunction with actual power dissipation and ambient conditions to verify TJ stays below 150 °C.
Can SMB8J28CAHE3_B/H be used in place of SMBJ28CA?
No - SMB8J28CAHE3_B/H and SMBJ28CA are not interchangeable. SMB8J28CAHE3_B/H is part of the 800 W bidirectional SMB8JxxCA family with AEC-Q101 qualification and HE3 suffix indicating RoHS/AEC-Q101 compliance. SMBJ28CA belongs to the older 600 W SMBJ series (non-AEC-Q101, no HE3 suffix) and exhibits different VBR tolerance, clamping consistency, and qualification status. Substituting SMB8J28CAHE3_B/H for SMBJ28CA requires validation of surge margin, thermal performance, and automotive compliance - the SMB8J28CAHE3_B/H is not a drop-in replacement.
SMB8J28CAHE3_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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 28V
- Current - Peak Pulse (10/1000µs):
- 17.6A
- 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)
SMB8J28CAHE3_B/H FAQ
1.How can I place an order for SMB8J28CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHE3_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 SMB8J28CAHE3_B/H reliable?
The price and inventory of SMB8J28CAHE3_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 SMB8J28CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHE3_B/H?
SMB8J28CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHE3_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 SMB8J28CAHE3_B/H?
For technical support, including SMB8J28CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHE3_B/H requirements.
6.How does Aetrix verify that SMB8J28CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHE3_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 SMB8J28CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHE3_B/H?
All SMB8J28CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHE3_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 SMB8J28CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMB8J28CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CAHE3_B/H Tags
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