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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHE3/52
- Part No.:
- SMB8J8.5CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHE3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,789
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Product details
Overview
SMB8J8.5CAHE3/52 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 SMB8J8.5CAHE3/52 datasheet, SMB8J8.5CAHE3/52 pinout, SMB8J8.5CAHE3/52 application, or SMB8J8.5CAHE3/52 equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping behavior, low clamping ratio (VC/VWM ≈ 1.69), thermal resistance (RθJL = 20 °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 normal bias it presents high impedance (>1 MΩ leakage at VWM), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and long-term reliability under repetitive surges.
Designed per ANSI/IEEE C62.35 standards, SMB8J8.5CAHE3/52 delivers fast response (<1 ns), low incremental surge resistance, and meets MSL Level 1 (260 °C reflow). The bidirectional configuration supports AC-coupled lines and differential signaling without polarity constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - tight breakdown tolerance ensures predictable turn-on across temperature and unit variation |
| VC @ IPPM | 14.4 V at 40 A - clamping voltage limits stress on downstream ICs during 10/1000 µs transients |
| PPPM | 800 W - peak power handling capability with standardized 10/1000 µs surge waveform |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - enables operation in under-hood automotive environments and high-temperature industrial enclosures |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance supports reliable power dissipation without external heatsinking |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case meeting UL 94 V-0; matte tin-plated leads, J-STD-002 solderable; no polarity marking (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | AC-coupled transient path | Identical terminals enable bidirectional clamping; no orientation required during placement |
| Case (body) | Thermal and mechanical interface | Exposed metal slug not present; heat transfer occurs via leads to PCB copper pads (0.2" × 0.2") |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power rails |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| MSL Level 1 rating | Supports standard 260 °C lead-free reflow without preconditioning or baking |
| Low clamping ratio (VC/VWM) | 1.69 - minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
| High IPPM density | 40 A peak surge current in SMB footprint - delivers robust protection without requiring larger packages |
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 ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and ground, responding within <1 ns to transients exceeding 9.44 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor front-ends while maintaining signal fidelity below 8.5 V. |
Use Scenario: Safeguarding PLC digital input modules against induced surges from relay coil switching and motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected transient absorber on 24 V DC input lines, clamping spikes to ≤14.4 V during 800 W surges. Use Value: Eliminates need for external series impedance or filtering, reducing BOM count and board space in DIN-rail mounted controllers. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Differential-mode TVS pair (two SMB8J8.5CAHE3/52) across A/B lines, symmetrically clamping common- and differential-mode transients. Use Value: Maintains signal integrity up to 10 Mbps while surviving multiple 1 kV/500 A surges per IEC 61000-4-5. |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines (D+/D−) in smart home hubs exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ < 100 pF at 0 V) placed directly at connector, before ESD protection IC. Use Value: Limits clamping overshoot to 14.4 V without degrading 480 Mbps data eye, satisfying USB-IF ESD test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-E3/52 | Same SMB package and VWM/VBR/VC specs, but commercial-grade (non-AEC-Q101); RθJA = 72 °C/W vs. 72 °C/W (identical) | Lacks automotive qualification; unsuitable for under-hood or safety-critical systems | Select when cost sensitivity outweighs automotive compliance requirements |
| SMCJ8.5CAHE3/52 | Same AEC-Q101 rating and electrical specs, but larger SMC (DO-214AB) package; 1500 W PPPM vs. 800 W | Higher power handling enables use in 48 V battery systems or higher-energy surge environments | Choose when system-level surge testing requires >800 W margin or board layout allows larger footprint |
Compared with SMB8J8.5CAHE3/52, SMBJ8.5CA-E3/52 offers identical protection performance at lower cost but excludes automotive validation, while SMCJ8.5CAHE3/52 trades compact SMB size for +87.5% peak power capacity - enabling design flexibility across commercial, automotive, and industrial surge classes.
Availability
SMB8J8.5CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O conditioning, and telecom line interface applications requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant manufacturing.
Supply support for SMB8J8.5CAHE3/52 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, power density, and automotive-grade qualification.
SMB8J8.5CAHE3/52 belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for robust transient suppression in space-constrained automotive and industrial electronics where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J8.5CAHE3/52 at its rated peak pulse current?
The SMB8J8.5CAHE3/52 has a maximum clamping voltage (VC) of 14.4 V when subjected to its specified peak pulse current (IPPM) of 40 A using a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures downstream components experience no more than 14.4 V during surge events - critical for protecting 3.3 V or 5 V logic interfaces.
Is SMB8J8.5CAHE3/52 suitable for automotive applications?
Yes, SMB8J8.5CAHE3/52 is AEC-Q101 qualified and manufactured with automotive-grade process controls, including MSL Level 1 reflow compatibility and extended temperature operation from –55 °C to +150 °C. Its HE3 suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified status, making it appropriate for engine control, body electronics, and ADAS sensor protection circuits.
How does the bidirectional configuration of SMB8J8.5CAHE3/52 affect its usage in circuit design?
The bidirectional nature of SMB8J8.5CAHE3/52 means it provides symmetrical clamping for both positive and negative transients without polarity dependency - ideal for AC-coupled lines like RS-485, CAN, or audio signals. Unlike unidirectional TVS diodes, SMB8J8.5CAHE3/52 requires no cathode marking during placement and eliminates risk of reverse installation error in automated assembly.
What is the maximum reverse leakage current for SMB8J8.5CAHE3/52 at its stand-off voltage?
At its 8.5 V stand-off voltage (VWM), SMB8J8.5CAHE3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and avoids loading effects on precision analog circuits - confirmed in Vishay's official Electrical Characteristics table for bidirectional SMB8J devices.
Can SMB8J8.5CAHE3/52 be used in place of a unidirectional TVS diode?
No - SMB8J8.5CAHE3/52 is strictly bidirectional and cannot replace a unidirectional TVS diode in DC-biased applications requiring forward conduction (e.g., power rail clamping with defined anode/cathode orientation). Attempting substitution may result in unintended conduction during normal operation. For unidirectional equivalents, refer to the SMB10J8.5AHE3/52 variant in the same datasheet.
SMB8J8.5CAHE3/52 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):
- 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)
SMB8J8.5CAHE3/52 FAQ
1.How can I place an order for SMB8J8.5CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHE3/52 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 SMB8J8.5CAHE3/52 reliable?
The price and inventory of SMB8J8.5CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J8.5CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHE3/52?
SMB8J8.5CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHE3/52 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 SMB8J8.5CAHE3/52?
For technical support, including SMB8J8.5CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J8.5CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHE3/52 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 SMB8J8.5CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHE3/52?
All SMB8J8.5CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHE3/52, 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 SMB8J8.5CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CAHE3/52 Tags
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