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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHE3_A/I
- Part No.:
- SMB8J8.5CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHE3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,678
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Product details
Overview
SMB8J8.5CAHE3_A/I 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 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 40 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 SMB8J8.5CAHE3_A/I datasheet, SMB8J8.5CAHE3_A/I pinout, SMB8J8.5CAHE3_A/I application, or SMB8J8.5CAHE3_A/I equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping behavior, low clamping ratio (VC/VWM ≈ 1.69), thermal resistance (RθJA = 72 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage exceeding VBR, it avalanches to divert surge current away from downstream circuitry while maintaining VC ≤ 14.4 V. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM).
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 (260 °C reflow peak) and supports automotive-grade reliability via AEC-Q101 qualification. The bidirectional configuration enables symmetric protection on AC-coupled or floating lines without polarity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - defines precise avalanche onset window for predictable triggering |
| VC @ IPPM | 14.4 V at 40 A (10/1000 µs) - limits protected circuit voltage during worst-case surge |
| PPPM | 800 W - energy-handling capacity for transient suppression per IEC 61000-4-5 compliance |
| ID @ VWM | ≤1.0 µA - ensures negligible standby power loss and signal integrity in high-impedance paths |
| TJ max | +150 °C - supports operation in under-hood automotive and industrial ambient environments |
| RθJA | 72 °C/W - determines thermal rise under sustained surge duty; requires ≥5.0 mm × 5.0 mm copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Surge current path terminal | Either terminal accepts transient current in either direction; no cathode band marking required |
| Case (exposed metal slug) | Thermal conduction path | Integral to thermal management - must be soldered to PCB copper pour for RθJA derating compliance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control, ADAS sensors, and body modules |
| Glass-passivated junction | Ensures long-term stability of VBR and low parametric drift across temperature and life cycles |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns or baking requirements |
| Low clamping ratio (VC/VWM) | 1.69 - minimizes overvoltage stress on protected ICs compared to higher-ratio alternatives |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102, supporting lead-free assembly |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ESD events in vehicle cabins. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and ground, responding within <1 ns to transients. Use Value: Maintains signal integrity below 14.4 V during 40 A surges, preventing latch-up or damage to 3.3 V/5 V microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding PLC digital input channels against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Fast-acting voltage limiter across input terminals, clamping spikes before they reach isolation barriers or optocouplers. Use Value: Withstands repetitive 800 W surges without degradation, enabling >100,000 switching cycles in harsh factory environments. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul links from lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Symmetric bidirectional clamp across differential pair (A/B), preserving common-mode noise rejection. Use Value: Delivers 14.4 V clamping at 40 A while adding <0.5 pF parasitic capacitance - negligible impact on 10 Mbps data integrity. |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 D+/D- lines in smart home hubs exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS placed after primary ESD array to handle higher-energy transients missed by on-die protection. Use Value: Enables pass-fail compliance with IEC 61000-4-2 Level 4 (15 kV air, 8 kV contact) without signal distortion or insertion loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J8.5CAHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated | Choose when environmental compliance (e.g., JEDEC J-STD-609) overrides cost sensitivity |
| SMBJ8.5CAHE3_A/I | Same VWM/VBR/VC ratings but rated for 1000 W PPPM (unidirectional only); bidirectional version not available | Not suitable for AC or floating-line protection; limited to DC-biased single-ended paths | Select only for unidirectional DC rails where higher 1000 W rating is required and polarity is fixed |
Compared with SMB8J8.5CAHE3_A/I, SMB8J8.5CAHM3_A/I offers identical protection performance with halogen-free materials, while SMBJ8.5CAHE3_A/I provides higher power rating but lacks bidirectional capability - making it unsuitable for symmetric surge scenarios like RS-485 or audio lines.
Availability
SMB8J8.5CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line drivers, and consumer USB port protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J8.5CAHE3_A/I 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 and automotive-grade validation.
The SMB8J series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in space-constrained automotive and industrial systems.
FAQ
What is the clamping voltage of SMB8J8.5CAHE3_A/I at its rated peak pulse current?
The SMB8J8.5CAHE3_A/I has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 40 A with a 10/1000 µs waveform. This value is measured under standardized test conditions and ensures downstream circuitry remains below critical overvoltage thresholds during surge events. The SMB8J8.5CAHE3_A/I maintains this clamping performance across its qualified temperature range.
Is SMB8J8.5CAHE3_A/I suitable for automotive applications?
Yes, SMB8J8.5CAHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant, AEC-Q101-qualified construction. It is validated for under-hood and cabin applications including sensor interfaces, LIN/CAN node protection, and infotainment I/O - meeting stringent reliability, thermal, and surge endurance requirements defined in the AEC standard. The SMB8J8.5CAHE3_A/I data sheet confirms full qualification per test schedule.
What does the "CA" suffix indicate in SMB8J8.5CAHE3_A/I?
The "CA" suffix in SMB8J8.5CAHE3_A/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both polarities without requiring orientation during placement. This distinguishes it from unidirectional variants (e.g., SMB8J8.5AHE3_A/I) that feature a cathode band and conduct only in reverse bias. The SMB8J8.5CAHE3_A/I's bidirectional nature makes it ideal for AC-coupled, floating, or differential signal lines.
How does SMB8J8.5CAHE3_A/I differ from SMBJ8.5CAHE3_A/I?
SMB8J8.5CAHE3_A/I is bidirectional with 800 W peak pulse power (PPPM), while SMBJ8.5CAHE3_A/I is unidirectional with 1000 W PPPM - but no bidirectional version exists in the SMBJ family. The SMB8J8.5CAHE3_A/I also uses a different junction design optimized for lower clamping ratio (14.4 V vs. 15.0 V typical for SMBJ8.5CA) and tighter VBR tolerance. These differences make SMB8J8.5CAHE3_A/I preferable for AC or polarity-agnostic protection, whereas SMBJ8.5CAHE3_A/I suits higher-power DC rails.
What PCB layout guidance applies to SMB8J8.5CAHE3_A/I for optimal thermal performance?
To achieve the specified RθJA of 72 °C/W, SMB8J8.5CAHE3_A/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the Vishay datasheet. Thermal vias under the pad and connection to internal ground planes further reduce junction temperature. The SMB8J8.5CAHE3_A/I's DO-214AA package relies on copper area for heat dissipation - undersized pads will cause thermal derating and premature failure under repeated surges.
SMB8J8.5CAHE3_A/I 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 55.6A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J8.5CAHE3_A/I FAQ
1.How can I place an order for SMB8J8.5CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHE3_A/I 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 SMB8J8.5CAHE3_A/I reliable?
The price and inventory of SMB8J8.5CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J8.5CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHE3_A/I?
SMB8J8.5CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHE3_A/I 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 SMB8J8.5CAHE3_A/I?
For technical support, including SMB8J8.5CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHE3_A/I requirements.
6.How does Aetrix verify that SMB8J8.5CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHE3_A/I 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 SMB8J8.5CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHE3_A/I?
All SMB8J8.5CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHE3_A/I, 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 SMB8J8.5CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CAHE3_A/I Tags
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