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Vishay General Semiconductor - Diodes Division SMBJ8.5CAHE3_B/H
- Part No.:
- SMBJ8.5CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAHE3_B/H.pdf
- Description:
- 600W,8.5V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ8.5CAHE3_B/H 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 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 41.7 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed for ESD and surge protection of MOSFETs, ICs, and sensor interfaces in industrial and telecom equipment.
For engineers reviewing the SMBJ8.5CAHE3_B/H datasheet, SMBJ8.5CAHE3_B/H pinout, SMBJ8.5CAHE3_B/H application, or SMBJ8.5CAHE3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), low leakage (<1.0 µA at VWM), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both polarities, enabling robust transient suppression without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%), fast response time (<1.0 ps), and low incremental surge resistance - critical for limiting induced overvoltage during inductive switching or lightning surges.
The SMBJ8.5CAHE3_B/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and carries AEC-Q101 qualification for automotive-grade reliability. Its unmarked bidirectional terminals simplify PCB layout while maintaining compliance with ANSI/IEEE C62.35 surge standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse working voltage before clamping initiates; sets safe operating margin below circuit supply rails. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - defines guaranteed breakdown onset range; ensures predictable clamping threshold across temperature and lot variation. |
| VC @ IPPM | 14.4 V at 41.7 A - clamped voltage under 10/1000 µs surge; determines maximum stress imposed on protected downstream components. |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform; supports repetitive surge events at 0.01% duty cycle. |
| ID @ VWM | <1.0 µA - reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - maximum junction temperature rating; enables operation in under-hood automotive or enclosed industrial environments. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; forms symmetrical conduction path with cathode. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; completes bidirectional clamping loop with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and infotainment power rails. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced failure during assembly. |
| Glass passivated junction | Ensures long-term VBR stability and low leakage drift over temperature and lifetime. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback signal lines against inductive kickback from BLDC motor windings. IC Role / Device Role / Timing Role: Voltage clamping element placed directly at MOSFET gate-source or op-amp input nodes. Use Value: Limits transient overshoot to ≤14.4 V, preventing gate oxide rupture and analog front-end saturation during 100 A switching events. |
Use Scenario: Shielding CAN/LIN bus transceivers and temperature/hall-effect sensors from load-dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential bus lines or single-ended sensor outputs. Use Value: Maintains signal integrity by clamping ±14.4 V spikes within nanoseconds, meeting ISO 16750-2 pulse 5a/b immunity requirements. |
| Telecom Power Feeds | Consumer USB-C PD Ports |
|
Use Scenario: Safeguarding PoE (Power over Ethernet) injectors and splitters from lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Common-mode TVS pair across data pairs, referenced to chassis ground. Use Value: Absorbs 600 W surge energy without degradation, preserving IEEE 802.3af/at compliance and avoiding latch-up in PHY ICs. |
Use Scenario: Secondary-level surge protection on VBUS and CC lines in USB-C receptacles exposed to ESD and hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp between VBUS and GND or CC and GND. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <15 V within <1 ns, preventing damage to USB PD controllers and port switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-E3/52 | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC specs, identical SMB package and pinout. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle traceability is not required. |
| SMCJ8.5CAHE3_A/H | Higher power rating (1500 W PPPM), larger SMC (DO-214AB) package, same VWM/VBR/VC values. | Used where higher surge repetition rate or longer surge duration (e.g., IEC 61000-4-5 ring wave) demands greater energy absorption. | Choose when system-level surge testing exceeds 600 W capability or board space allows larger footprint for enhanced margin. |
Compared with SMBJ8.5CAHE3_B/H, the SMBJ8.5CA-E3/52 offers identical electrical performance at lower cost but no automotive qualification, while the SMCJ8.5CAHE3_A/H delivers 2.5× higher surge energy handling in a physically larger package - guiding selection based on reliability tier and surge severity requirements.
Availability
SMBJ8.5CAHE3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power feeds, and consumer USB-C PD ports requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ8.5CAHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in space-constrained SMT applications, targeting automotive, industrial, and telecom systems where robustness and repeatable clamping performance are critical.
FAQ
What does the 'CA' suffix indicate in SMBJ8.5CAHE3_B/H?
The 'CA' suffix denotes a bidirectional configuration: SMBJ8.5CAHE3_B/H conducts symmetrically in both polarities, making it suitable for AC signal lines, differential buses, or floating nodes where polarity cannot be assumed. Unlike unidirectional 'A' variants, it has no cathode band marking and exhibits identical VBR and VC characteristics for positive and negative transients - confirmed in Vishay's datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SMBJ8.5CAHE3_B/H qualified to AEC-Q101?
Yes, SMBJ8.5CAHE3_B/H is explicitly AEC-Q101 qualified, as indicated by the 'HE3' suffix and confirmed in the "MECHANICAL DATA" section of the Vishay datasheet (Document Number: 88392, Revision: 09-Jan-2024). This qualification covers temperature cycling, humidity bias, mechanical shock, and ESD testing - validating its suitability for automotive powertrain and body electronics applications.
What is the maximum clamping voltage (VC) for SMBJ8.5CAHE3_B/H and under what test condition?
The maximum clamping voltage VC for SMBJ8.5CAHE3_B/H is 14.4 V, measured at a peak pulse current IPPM of 41.7 A using the standardized 10/1000 µs double-exponential surge waveform. This value is specified in the "ELECTRICAL CHARACTERISTICS" table on page 2 of the Vishay datasheet and represents the worst-case voltage seen by protected circuitry during a full-power transient event.
How does the thermal resistance RθJA of SMBJ8.5CAHE3_B/H affect PCB layout?
SMBJ8.5CAHE3_B/H has a typical RθJA of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under 5.0 W steady-state dissipation, designers must ensure adequate copper area and avoid thermal isolation - underscoring the need for direct thermal vias to inner-layer ground planes in high-reliability layouts.
Can SMBJ8.5CAHE3_B/H replace SMBJ8.5AHE3_B/H in a design?
No - SMBJ8.5CAHE3_B/H is bidirectional while SMBJ8.5AHE3_B/H is unidirectional, with different polarity marking (cathode band) and asymmetric IV behavior. Substitution would compromise protection on negative-going transients in DC-biased circuits. The datasheet explicitly separates CA (bidirectional) and A (unidirectional) variants in all parameter tables and application notes.
SMBJ8.5CAHE3_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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ8.5CAHE3_B/H FAQ
1.How can I place an order for SMBJ8.5CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAHE3_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 SMBJ8.5CAHE3_B/H reliable?
The price and inventory of SMBJ8.5CAHE3_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 SMBJ8.5CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAHE3_B/H?
SMBJ8.5CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAHE3_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 SMBJ8.5CAHE3_B/H?
For technical support, including SMBJ8.5CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAHE3_B/H requirements.
6.How does Aetrix verify that SMBJ8.5CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAHE3_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 SMBJ8.5CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAHE3_B/H?
All SMBJ8.5CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAHE3_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 SMBJ8.5CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMBJ8.5CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CAHE3_B/H Tags
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