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Vishay General Semiconductor - Diodes Division SMB8J28CAHM3_B/H
- Part No.:
- SMB8J28CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHM3_B/H.pdf
- Description:
- 800W,28V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,478
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Product details
Overview
SMB8J28CAHM3_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 maximum 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 SMB8J28CAHM3_B/H datasheet, SMB8J28CAHM3_B/H pinout, SMB8J28CAHM3_B/H application, or SMB8J28CAHM3_B/H equivalent, key selection criteria include bidirectional clamping performance under 800 W surges, AEC-Q101 qualification for automotive use, low leakage (<1.0 µA at VWM), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
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 characteristics and low incremental surge resistance, while the bidirectional configuration enables symmetric clamping across both polarities without external polarity management.
The device is rated for continuous operation from −55 °C to +150 °C junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 72 °C/W) and RθJL = 20 °C/W support reliable power dissipation in compact PCB layouts with minimum recommended pad area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected line |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - guaranteed breakdown threshold ensuring predictable clamping onset |
| VC @ IPPM | 45.4 V at 17.6 A - clamping voltage during 10/1000 µs surge; determines maximum stress on downstream ICs |
| PPPM | 800 W - peak transient power handling capability; validates robustness against ISO 7637-2 Pulse 1/2a/5a surges |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - enables deployment in under-hood automotive environments and high-temperature industrial enclosures |
| AEC-Q101 | Qualified - certified for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band absent (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either end serves as anode or cathode depending on instantaneous polarity; no polarity marking required |
| Case | Thermal and mechanical interface | Plastic body provides electrical isolation; soldered copper pads act as primary heat sink via RθJL = 20 °C/W path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, high-temp reverse bias, and accelerated life testing |
| Glass-passivated junction | Ensures stable VBR over time and temperature; eliminates parameter drift due to moisture or contamination |
| MSL Level 1 rating | Supports standard SMT reflow without baking; peak temperature tolerance up to 260 °C |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V/5 V logic and CAN/LIN transceivers |
| Halogen-free & RoHS-compliant (HM3 suffix) | Fulfills environmental compliance for global automotive OEMs and industrial safety standards |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector entry point to limit transient voltage before reaching MCU ADC or LIN transceiver. Use Value: Maintains signal fidelity below 45.4 V clamping during 800 W surges, preserving sensor accuracy and preventing MCU reset or latch-up. | Use Scenario: Safeguarding PLC digital input channels exposed to 24 V DC field wiring with long cable runs and relay coil switching noise. IC Role / Device Role / Timing Role: Primary surge suppression element on each input line, mounted adjacent to terminal block to intercept transients before optocoupler or level-shifter. Use Value: Withstands repetitive 17.6 A surges at 10/1000 µs while leaking <1.0 µA at 28 V - enabling low-power monitoring without false triggering. |
| USB Port ESD Protection | DC Power Rail Clamping |
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in automotive infotainment head units. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp absorbing ±15 kV contact discharge per IEC 61000-4-2, placed after common-mode choke. Use Value: Sub-1 ns response time and 45.4 V VC ensure USB PHY remains within safe operating voltage during ESD events. | Use Scenario: Overvoltage clamping on 24 V auxiliary power rails feeding ADAS camera modules or radar processors. IC Role / Device Role / Timing Role: Parallel-connected TVS limiting rail excursions during ISO 7637-2 Pulse 5a (load dump), coordinated with upstream fuse and TVS array. Use Value: 800 W PPPM rating handles 120 V/100 ms load dump pulses without degradation, supporting ASIL-B system 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 |
|---|---|---|---|
| SMB8J28CAHE3_B/H | Same electrical specs; RoHS-compliant but not halogen-free; uses standard SnPb-compatible matte tin plating | Approved for commercial and industrial use; not AEC-Q101 qualified - unsuitable for automotive production | Select when halogen-free requirement is waived and cost sensitivity outweighs automotive qualification needs |
| SMAJ28CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (90 °C/W), same VWM/VC | Limited to lower-energy transients; less thermal margin in high-density layouts; not AEC-Q101 qualified | Choose only for space-constrained non-automotive designs where 400 W surge immunity suffices |
Compared with SMB8J28CAHM3_B/H, SMB8J28CAHE3_B/H offers identical protection performance without halogen-free compliance, while SMAJ28CA trades 50 % lower surge rating and reduced thermal robustness for smaller footprint - making SMB8J28CAHM3_B/H the optimal choice for AEC-Q101–mandated, high-reliability 800 W applications.
Availability
SMB8J28CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and DC power rail clamping requiring stable component supply across multi-year production cycles.
Supply support for SMB8J28CAHM3_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 and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J28CAHM3_B/H under a standard 10/1000 µs surge?
The SMB8J28CAHM3_B/H exhibits a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 17.6 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below this voltage threshold during surge events, protecting sensitive 3.3 V or 5 V logic interfaces connected to the same line.
Is SMB8J28CAHM3_B/H suitable for automotive applications?
Yes, SMB8J28CAHM3_B/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly rated for automotive use in engine control units, body electronics, and ADAS subsystems - validated for temperature cycling, high-temperature reverse bias, and mechanical shock per the AEC-Q101 stress test standard.
How does the bidirectional configuration of SMB8J28CAHM3_B/H affect its PCB layout?
The SMB8J28CAHM3_B/H has no polarity marking and functions identically regardless of orientation, simplifying PCB layout and eliminating risk of reverse installation. Engineers may place it symmetrically across differential lines (e.g., LIN, RS-485) or single-ended signals without concern for anode/cathode alignment - reducing assembly errors and enabling reuse across multiple signal types.
What is the thermal resistance of SMB8J28CAHM3_B/H, and how does it impact board design?
SMB8J28CAHM3_B/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads. To maintain TJ ≤ 150 °C during 800 W surges, designers must ensure adequate copper pour area and avoid thermal bottlenecks - especially critical in sealed automotive enclosures with limited airflow.
Does SMB8J28CAHM3_B/H meet industry-standard surge immunity tests?
Yes, SMB8J28CAHM3_B/H is characterized to withstand standardized surge waveforms including IEC 61000-4-5 (10/1000 µs), ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a (relay bounce), and Pulse 5a (load dump). Its 800 W PPPM rating and 45.4 V clamping voltage align with test levels required for Class III/IV automotive and industrial equipment per CISPR 25 and EN 61000-6-2.
SMB8J28CAHM3_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)
SMB8J28CAHM3_B/H FAQ
1.How can I place an order for SMB8J28CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHM3_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 SMB8J28CAHM3_B/H reliable?
The price and inventory of SMB8J28CAHM3_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 SMB8J28CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHM3_B/H?
SMB8J28CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHM3_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 SMB8J28CAHM3_B/H?
For technical support, including SMB8J28CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHM3_B/H requirements.
6.How does Aetrix verify that SMB8J28CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHM3_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 SMB8J28CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHM3_B/H?
All SMB8J28CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHM3_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 SMB8J28CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMB8J28CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CAHM3_B/H Tags
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