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Vishay General Semiconductor - Diodes Division SMB8J28C-E3/5B
- Part No.:
- SMB8J28C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28C-E3/5B.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,482
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Product details
Overview
SMB8J28C-E3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection on signal and power lines. It features 28 V stand-off voltage (VWM), 45.4 V maximum clamping voltage at 17.6 A peak pulse current, and 800 W peak pulse power rating with 10/1000 µs waveform. Used to protect automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMB8J28C-E3/5B datasheet, SMB8J28C-E3/5B pinout, SMB8J28C-E3/5B application, or SMB8J28C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically across both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at 28 V), while the low incremental surge resistance supports consistent clamping performance under repetitive surges.
The device meets MSL Level 1 per J-STD-020 with 260 °C peak reflow profile and is qualified to AEC-Q101 for automotive under-hood and chassis applications. Thermal resistance is 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min / max | 31.1 V / 34.4 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 45.4 V at 17.6 A - Clamping voltage during 10/1000 µs surge; limits downstream voltage stress to safe levels. |
| PPPM | 800 W - Peak pulse power handling capacity; determines survivability against standardized lightning/surge events. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max | 150 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures. |
| Package | DO-214AA (SMB) - Surface-mount package with 0.220" x 0.205" outline and cathode-band marking; compatible with standard SMT pick-and-place. |
Pinout & Package
DO-214AA (SMB) package: bi-directional device with no polarity marking; symmetrical two-terminal construction. Cathode band absent - terminals are functionally identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as bidirectional surge current entry/exit points; no DC polarity dependency. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; copper pad mounting required for thermal dissipation and surge current path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment I/O protection. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage performance across temperature and life cycles. |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns; peak reflow up to 260 °C permitted. |
| Matte tin plated leads | Complies with J-STD-002 and JESD 22-B102 for solderability; meets JESD 201 Class 1A whisker resistance. |
| UL 94 V-0 molding compound | Flame-retardant encapsulation suitable for safety-critical industrial and automotive assemblies. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector entry point to shunt transients before reaching sensitive ICs. Use Value: Limits voltage excursion to ≤45.4 V during 17.6 A surges, preserving signal integrity and preventing latch-up in 3.3 V/5 V microcontrollers. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, coordinated with series impedance for energy absorption. Use Value: Withstands repeated 800 W surges without degradation, supporting >100,000 surge cycles per IEC 61000-4-5 compliance testing. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station equipment from lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Differential-mode TVS pair (two SMB8J28C-E3/5B devices) across data lines to suppress asymmetrical surges. Use Value: Symmetric 31.1–34.4 V breakdown enables balanced clamping on twisted-pair lines, minimizing signal distortion during surge events. |
Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor inverters from back-EMF spikes during brushless DC motor commutation. IC Role / Device Role / Timing Role: Secondary-level transient suppressor located between motor driver IC and MCU interface lines. Use Value: Fast response time and low clamping voltage prevent false triggering and reset events in real-time motor control firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA | Same VWM (28 V), same DO-214AA package, but rated for 600 W PPPM (vs. 800 W); lower IPPM (13.3 A). | Not AEC-Q101 qualified; intended for commercial-grade consumer/industrial use only. | Select when cost sensitivity outweighs automotive qualification and higher surge margin. |
| SMCJ28CA | Same VWM and bi-directionality, but in larger DO-214AB (SMC) package; rated for 1500 W PPPM and 43.3 A IPPM. | Higher thermal mass and power handling; requires larger PCB footprint and different pad layout. | Choose when system-level surge requirements exceed 800 W or extended thermal cycling is expected. |
Compared with SMBJ28CA and SMCJ28CA, SMB8J28C-E3/5B uniquely balances AEC-Q101 qualification, 800 W surge capability, and compact SMB footprint-making it optimal for space-constrained automotive modules where reliability and regulatory compliance are non-negotiable.
Availability
SMB8J28C-E3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, telecom infrastructure, and appliance motor control systems requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J28C-E3/5B 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-reliability bi-directional surge suppression in automotive and industrial environments where AEC-Q101 validation and precise clamping performance are mandatory.
FAQ
What is the polarity configuration of SMB8J28C-E3/5B?
SMB8J28C-E3/5B is a bi-directional TVS diode with symmetrical terminal construction and no polarity marking. Unlike uni-directional variants, it conducts equally in both directions above its breakdown voltage, making it ideal for protecting AC signals, differential buses, and ungrounded interfaces without concern for orientation during placement.
Is SMB8J28C-E3/5B qualified for automotive applications?
Yes, SMB8J28C-E3/5B is AEC-Q101 qualified and explicitly listed in Vishay's qualified parts list for automotive use. It meets stringent stress tests including temperature cycling, humidity bias, and high-temperature operating life-enabling deployment in engine control units, ADAS camera modules, and body electronics where functional safety is required.
What does the "E3/5B" suffix indicate in SMB8J28C-E3/5B?
The "E3" denotes RoHS-compliant matte tin plating meeting JESD 201 Class 1A whisker resistance, while "5B" specifies packaging in 13-inch diameter plastic tape and reel with 3200 units per reel. This format supports high-volume automated assembly and ensures traceability through Vishay's standard ordering nomenclature.
How does SMB8J28C-E3/5B compare to uni-directional SMB10J28A in clamping performance?
SMB8J28C-E3/5B has a higher clamping voltage (45.4 V vs. 42.1 V) and lower peak pulse power (800 W vs. 1000 W) than SMB10J28A due to its bi-directional architecture. However, SMB8J28C-E3/5B provides full-symmetry protection essential for differential or floating lines-where SMB10J28A would require dual placement or fail to suppress negative-going transients.
What PCB layout guidance applies to SMB8J28C-E3/5B for optimal surge handling?
Per Vishay's datasheet, SMB8J28C-E3/5B must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W pulse power. Thermal vias under pads and connection to internal ground planes are recommended to maintain junction temperature below 150 °C during repetitive surges.
SMB8J28C-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 16A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J28C-E3/5B FAQ
1.How can I place an order for SMB8J28C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28C-E3/5B 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 SMB8J28C-E3/5B reliable?
The price and inventory of SMB8J28C-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J28C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28C-E3/5B?
SMB8J28C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28C-E3/5B 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 SMB8J28C-E3/5B?
For technical support, including SMB8J28C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28C-E3/5B requirements.
6.How does Aetrix verify that SMB8J28C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J28C-E3/5B 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 SMB8J28C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J28C-E3/5B?
All SMB8J28C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28C-E3/5B, 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 SMB8J28C-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J28C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28C-E3/5B Tags
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