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Vishay General Semiconductor - Diodes Division SMBJ8.0A-E3/5B
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- Part No.:
- SMBJ8.0A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.0A-E3/5B.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,830
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Product details
Overview
SMBJ8.0A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 8.0 V stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 1 mA, 13.6 V clamping voltage (VC) at 44.1 A peak pulse current, and 600 W peak pulse power capability with 10/1000 µs waveform - deployed on power rails and signal lines of industrial sensor interfaces.
For engineers reviewing the SMBJ8.0A-E3/5B datasheet, SMBJ8.0A-E3/5B pinout, SMBJ8.0A-E3/5B application, or SMBJ8.0A-E3/5B equivalent, this page delivers verified electrical parameters, thermal behavior under surge conditions, RoHS-compliant commercial-grade packaging, and direct alternatives for overvoltage protection design validation.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 8.0 V, it enters avalanche breakdown to divert transient energy away from downstream ICs. Its low incremental surge resistance (typical <0.3 Ω) ensures minimal voltage overshoot during fast transients.
Designed for surface-mount assembly on PCBs with 0.2" × 0.2" copper pads per terminal, it supports automated placement and meets J-STD-020 MSL Level 1 (peak reflow ≤260 °C). Junction temperature range spans –55 °C to +150 °C, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.0 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 8.89–9.83 V at IT = 1 mA - precise avalanche onset threshold ensuring predictable turn-on during transients. |
| VC (Clamping Voltage) | 13.6 V at IPPM = 44.1 A - peak voltage seen by protected circuit during 600 W surge; limits stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W with 10/1000 µs waveform - sustained surge handling capacity for industrial-level transient immunity. |
| IPPM (Peak Pulse Current) | 44.1 A - maximum non-repetitive surge current the device can safely clamp without degradation. |
| RθJA (Junction-to-Ambient) | 100 °C/W - thermal performance baseline for PCB layout planning; requires adequate copper area for derating above 25 °C. |
| TJmax | +150 °C - maximum junction temperature enabling operation in high-ambient industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node / ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during surge. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3/4 surges without external heat sinking. |
| Fast response time (<1 ps) | Clamps transients before sensitive logic or analog circuits experience damaging overvoltage. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot across protected nodes, preserving signal integrity in high-speed interfaces. |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking; compatible with high-volume automated assembly lines. |
| RoHS-compliant, halogen-free option available | E3 suffix denotes commercial-grade RoHS compliance; supports environmental compliance in global OEM designs. |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
|
Use Scenario: Protecting 5 V supply lines feeding Hall-effect sensors and CAN transceivers in factory automation systems exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VCC and GND, clamping transients within 13.6 V to prevent latch-up or gate oxide damage in downstream ICs. Use Value: Maintains functional safety by limiting rail voltage excursion to 70% below typical 24 V system fault thresholds, avoiding brown-out resets. |
Use Scenario: Safeguarding 12 V battery-fed microcontroller power inputs in BCMs subjected to load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Primary front-end TVS on main power input, absorbing up to 600 W pulses while coordinating with secondary LC filtering. Use Value: Survives repetitive 40 V/100 ms transients without parameter shift, extending field reliability beyond 15-year automotive service life. |
| USB 2.0 Data Line ESD Suppression | PLC Digital Input Module Transient Guarding |
|
Use Scenario: Secondary-level ESD protection on USB D+/D– lines after series impedance, meeting IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS (CJ < 100 pF at 0 V) placed adjacent to connector, clamping ESD arcs before reaching PHY. Use Value: Prevents data corruption and PHY latch-up while maintaining signal rise/fall times <1 ns due to sub-0.3 Ω dynamic resistance. |
Use Scenario: Protecting 24 V DC digital input channels in programmable logic controllers interfacing with industrial solenoids and limit switches. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 8.0 V) used in series with current-limiting resistor to tolerate 24 V nominal while clamping 1 kV/1 A transients. Use Value: Enables fail-safe input state retention during surge events, eliminating false triggering and reducing maintenance downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0CA-E3/5B | Bidirectional variant; symmetric VBR = 8.89–9.83 V in both polarities; no polarity marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, audio); not suitable for DC rail protection where polarity matters. | Select SMBJ8.0CA-E3/5B only when protecting balanced differential pairs or bidirectional buses. |
| SMAJ8.0A-E3/52 | Same VWM/VBR/VC, but lower PPPM = 400 W; SMA (DO-214AC) package with smaller footprint and higher RθJA = 140 °C/W. | Acceptable for lower-energy transients (IEC 61000-4-2 ESD only); unsuitable for lightning or inductive switch surges requiring 600 W. | Choose SMAJ8.0A-E3/52 only if board space is constrained and surge threat level is limited to human-body-model ESD. |
Compared with SMBJ8.0CA-E3/5B and SMAJ8.0A-E3/52, SMBJ8.0A-E3/5B provides optimal balance of 600 W surge capacity, unidirectional polarity control, and SMB package thermal performance - making it the preferred choice for 24 V industrial DC power rail protection where directional clamping and thermal margin are critical.
Availability
SMBJ8.0A-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, USB 2.0 ESD protection, and PLC digital input modules requiring stable component supply and long-term lifecycle continuity.
Supply support for SMBJ8.0A-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, TVS devices, and MOSFETs with emphasis on reliability, ruggedness, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where failure tolerance and surge immunity are non-negotiable.
FAQ
What is the clamping voltage of SMBJ8.0A-E3/5B at its rated peak pulse current?
The SMBJ8.0A-E3/5B has a maximum clamping voltage (VC) of 13.6 V when subjected to its rated peak pulse current (IPPM) of 44.1 A using the standard 10/1000 µs waveform. This value is measured under defined test conditions per JEDEC standards and represents the upper voltage limit imposed on the protected circuit during surge events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ8.0A-E3/5B achieves this with low dynamic impedance, minimizing voltage overshoot during fast transients.
Is SMBJ8.0A-E3/5B RoHS-compliant and lead-free?
Yes, SMBJ8.0A-E3/5B is RoHS-compliant and lead-free, as confirmed by the "E3" suffix in its ordering code. Vishay specifies that E3-suffixed parts meet RoHS Directive 2011/65/EU requirements, with homogeneous lead content below 1000 ppm. The matte tin-plated terminals comply with J-STD-002 for solderability, and the molding compound meets UL 94 V-0 flammability rating. No exemptions apply - the SMBJ8.0A-E3/5B is fully compliant for use in consumer, industrial, and automotive applications requiring green material certification.
Can SMBJ8.0A-E3/5B be used in bidirectional signal protection applications?
No, SMBJ8.0A-E3/5B is a unidirectional TVS diode and must not be used for bidirectional signal protection. Its cathode band indicates polarity, and it only clamps in reverse bias - forward conduction occurs at ~0.7 V, offering no surge protection in positive half-cycles. For bidirectional applications like RS-485, CAN, or AC-coupled audio, the correct variant is SMBJ8.0CA-E3/5B, which features symmetrical breakdown in both directions. Using SMBJ8.0A-E3/5B in such roles risks permanent forward conduction, overheating, and failure during positive transients.
What is the thermal resistance and maximum junction temperature of SMBJ8.0A-E3/5B?
The SMBJ8.0A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal, and junction-to-lead resistance (RθJL) of 20 °C/W. Its maximum operating junction temperature (TJmax) is +150 °C, allowing reliable operation in high-ambient industrial enclosures. Derating curves in the datasheet show usable power decreases linearly above 25 °C ambient - for example, at 85 °C ambient, the device sustains only ~60% of its 600 W peak rating. These values are integral to thermal design validation for the SMBJ8.0A-E3/5B.
How does SMBJ8.0A-E3/5B differ from SMAJ8.0A-E3/52 in terms of surge capability and package?
SMBJ8.0A-E3/5B delivers 600 W peak pulse power with a 10/1000 µs waveform, whereas SMAJ8.0A-E3/52 is rated for only 400 W - a 33% reduction in surge energy handling. Physically, SMBJ8.0A-E3/5B uses the larger SMB (DO-214AA) package (5.21 mm × 4.06 mm), offering lower thermal resistance (RθJA = 100 °C/W) versus SMAJ8.0A-E3/52's SMA (DO-214AC) package (4.57 mm × 2.79 mm) with RθJA = 140 °C/W. Both share identical VWM = 8.0 V and VC = 13.6 V, but the SMBJ8.0A-E3/5B is required for high-energy threats like lightning-induced surges, while SMAJ8.0A-E3/52 suits compact ESD-only designs.
SMBJ8.0A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 44.1A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ8.0A-E3/5B FAQ
1.How can I place an order for SMBJ8.0A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.0A-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 SMBJ8.0A-E3/5B reliable?
The price and inventory of SMBJ8.0A-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 SMBJ8.0A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.0A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.0A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.0A-E3/5B?
SMBJ8.0A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.0A-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 SMBJ8.0A-E3/5B?
For technical support, including SMBJ8.0A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.0A-E3/5B requirements.
6.How does Aetrix verify that SMBJ8.0A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.0A-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 SMBJ8.0A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.0A-E3/5B?
All SMBJ8.0A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.0A-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 SMBJ8.0A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.0A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.0A-E3/5B Tags
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