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Vishay General Semiconductor - Diodes Division SMBJ8.0CAHE3/5B
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- Part No.:
- SMBJ8.0CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.0CAHE3/5B.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,306
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Product details
Overview
SMBJ8.0CAHE3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 8.0 V stand-off voltage (VWM), 600 W peak pulse power (10/1000 µs), and clamps to ≤13.6 V at 44.1 A peak surge current - deployed in sensor interface protection, industrial I/O modules, and telecom line conditioning.
For engineers reviewing the SMBJ8.0CAHE3/5B datasheet, SMBJ8.0CAHE3/5B pinout, SMBJ8.0CAHE3/5B application, or SMBJ8.0CAHE3/5B equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance data, junction capacitance behavior, and real-world design context for ESD/surge protection layout decisions.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical breakdown (VBR min/max = 8.89–9.83 V at 1.0 mA test current) and clamping characteristics. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), enabling protection of low-voltage CMOS interfaces without signal distortion.
Thermal performance is defined by RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), supporting operation up to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 - confirming suitability for automotive front-end electronics and harsh-environment industrial control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected circuit's normal operating range. |
| VBR (min/max) | 8.89 V / 9.83 V at 1.0 mA - Confirmed bidirectional breakdown threshold; ensures symmetrical clamping on positive/negative transients. |
| VC @ IPPM | ≤13.6 V at 44.1 A - Clamped voltage during 600 W transient; defines worst-case overvoltage seen by downstream ICs. |
| PPPM | 600 W (10/1000 µs waveform) - Peak surge energy handling capacity; supports repetitive lightning-induced surges in telecom infrastructure. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage at stand-off voltage; prevents loading of high-impedance sensor outputs or battery-powered circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive modules and enclosed industrial enclosures. |
| RθJA | 100 °C/W (typ.) - Thermal resistance to ambient on standard PCB pad layout; informs derating requirements above 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A (bidirectional) | One side of symmetrical PN junction; connects to line being protected (e.g., RS-485 A or CAN_H). |
| Cathode | Terminal K (bidirectional) | Other side of symmetrical PN junction; connects to same line (e.g., RS-485 B or CAN_L); no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS sensor interfaces. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 50 Ω source impedance without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VWM ≈ 1.7) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V or 5 V logic rails where margin above VDD is tight. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without pre-baking; eliminates moisture-related popcorning risk. |
| UL 497B recognized (QVGQ2) | Approved for use in telecom and industrial safety-critical surge protectors - simplifies end-equipment certification. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I²C/SPI buses in factory-floor pressure/temperature sensors exposed to relay switching noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor IC and connector, shunting transients before they reach precision ADC or microcontroller GPIO. Use Value: Prevents latch-up and parametric drift in 16-bit SAR ADCs by limiting induced spikes to ≤13.6 V while maintaining <1 µA leakage at 8.0 V nominal rail. |
Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers against load dump and alternator ripple in vehicle body electronics. IC Role / Device Role / Timing Role: TVS placed across LIN signal pair (LIN_H/L) near connector, absorbing coupled transients from adjacent 12 V power wiring. Use Value: Enables compliance with ISO 7637-3 Pulse 2b (50 V/2 Ω) due to sub-1 ns response and symmetrical clamping - no polarity-sensitive placement required. |
| Telecom Line Card Protection | Consumer USB Port ESD Clamp |
|
Use Scenario: Front-end surge suppression on POTS or xDSL line cards handling AC ringing voltages up to 90 V RMS and lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS stage before gas discharge tube (GDT) and series impedance, limiting fast-rising transients before GDT fires. Use Value: Withstands repeated 600 W surges per IEC 61000-4-5 while maintaining VWM = 8.0 V - avoids false triggering during normal AC ring detection. |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in portable audio devices, supplementing internal SoC ESD structures. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed between USB connector and PHY, routed with minimal stub length. Use Value: Delivers <15 pF junction capacitance (per Fig. 4) at zero bias - preserves signal integrity up to 480 Mbps without eye diagram 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 |
|---|---|---|---|
| SMBJ8.0CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMB package. | No functional difference - selected when halogen-free material compliance is mandated by OEM environmental policy. | Choose SMBJ8.0CA-M3/5B if halogen-free bill-of-materials is required; otherwise SMBJ8.0CAHE3/5B offers identical protection performance. |
| SMCJ8.0CAHE3/5B | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM rating and lower RθJA (50 °C/W). | Used where higher surge energy tolerance or improved thermal dissipation is needed - e.g., outdoor telecom cabinets or motor drive I/O. | Choose SMCJ8.0CAHE3/5B only when 1500 W surge capability or lower thermal resistance is required; SMBJ8.0CAHE3/5B remains optimal for space-constrained PCBs. |
Compared with SMBJ8.0CA-M3/5B, SMBJ8.0CAHE3/5B provides identical protection performance with standard RoHS compliance; compared with SMCJ8.0CAHE3/5B, it trades surge capacity for 40 % smaller footprint and higher board density - ideal for compact consumer and automotive ECUs.
Availability
SMBJ8.0CAHE3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom line cards, and consumer USB port protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ8.0CAHE3/5B 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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on reliability, power efficiency, and application-specific robustness.
The SMBJ series targets board-level transient protection in automotive, industrial, and telecom systems - engineered for high surge immunity, low clamping voltage, and seamless integration into automated SMT lines.
FAQ
What is the maximum clamping voltage of SMBJ8.0CAHE3/5B at its rated peak pulse current?
The SMBJ8.0CAHE3/5B clamps to a maximum of 13.6 V at its rated peak pulse current of 44.1 A (10/1000 µs waveform). This value is measured under standardized test conditions per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The low clamping voltage ensures downstream 5 V or 3.3 V ICs remain within safe overvoltage limits during surge events. SMBJ8.0CAHE3/5B maintains this performance across its full operating temperature range.
Is SMBJ8.0CAHE3/5B suitable for automotive applications?
Yes, SMBJ8.0CAHE3/5B is AEC-Q101 qualified, as indicated by the "HE3" suffix, and meets automotive-grade reliability requirements including temperature cycling, high-temperature reverse bias, and ESD testing. It is explicitly approved for use in body control modules, sensor interfaces, and infotainment I/O protection. SMBJ8.0CAHE3/5B operates from –55 °C to +150 °C and supports reflow profiles up to 260 °C, satisfying JEDEC J-STD-020 MSL Level 1.
How does the bidirectional configuration of SMBJ8.0CAHE3/5B affect its circuit implementation?
The bidirectional configuration of SMBJ8.0CAHE3/5B means it conducts identically in both directions - no cathode marking is present, and it protects AC-coupled or differential lines (e.g., RS-485, CAN, LIN) without polarity concerns. Unlike unidirectional TVS diodes, SMBJ8.0CAHE3/5B requires no orientation check during placement, reducing SMT errors. Its symmetrical VBR (8.89–9.83 V) and VC ensure balanced clamping on positive and negative transients.
What is the junction capacitance of SMBJ8.0CAHE3/5B, and why does it matter?
The junction capacitance of SMBJ8.0CAHE3/5B is approximately 120 pF at zero bias (per Fig. 4 in the Vishay datasheet), decreasing with applied reverse voltage. This value matters because excessive capacitance can attenuate high-speed signals - for example, on USB 2.0 or LVDS lines. SMBJ8.0CAHE3/5B's capacitance is low enough for 10–20 Mbps digital interfaces but not recommended for >100 Mbps applications without layout optimization. Always verify signal integrity with TDR simulation when using SMBJ8.0CAHE3/5B on fast lines.
Does SMBJ8.0CAHE3/5B require a heatsink for standard operation?
No, SMBJ8.0CAHE3/5B does not require an external heatsink under typical surge conditions. Its thermal resistance (RθJA = 100 °C/W) is specified for mounting on 0.2" × 0.2" copper pads per terminal - sufficient for single-event 600 W pulses. Continuous power dissipation is limited to 5.0 W, but actual average power in transient suppression is negligible. SMBJ8.0CAHE3/5B relies on PCB copper area for thermal management; oversized pads or internal planes improve margin but are not mandatory for compliance with datasheet ratings.
SMBJ8.0CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ8.0CAHE3/5B FAQ
1.How can I place an order for SMBJ8.0CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.0CAHE3/5B 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 SMBJ8.0CAHE3/5B reliable?
The price and inventory of SMBJ8.0CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.0CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.0CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.0CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.0CAHE3/5B?
SMBJ8.0CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.0CAHE3/5B 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 SMBJ8.0CAHE3/5B?
For technical support, including SMBJ8.0CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.0CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ8.0CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.0CAHE3/5B 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 SMBJ8.0CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.0CAHE3/5B?
All SMBJ8.0CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.0CAHE3/5B, 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 SMBJ8.0CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.0CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.0CAHE3/5B Tags
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