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Vishay General Semiconductor - Diodes Division SMB8J8.5CA-E3/5B
- Part No.:
- SMB8J8.5CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CA-E3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,635
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Product details
Overview
SMB8J8.5CA-E3/5B 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, and 800 W peak pulse power (10/1000 µs waveform), commonly deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J8.5CA-E3/5B datasheet, SMB8J8.5CA-E3/5B pinout, SMB8J8.5CA-E3/5B application, or SMB8J8.5CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped shunt protector, responding to transients faster than 1 ns by avalanche breakdown across its symmetrical PN junction. Its bidirectional architecture enables suppression of both positive and negative polarity surges without polarity dependency, making it suitable for AC-coupled or floating signal lines.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, with maximum junction temperature rated at +150 °C. It meets ANSI/IEEE C62.35 standards for surge immunity and is qualified per AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe signal swing range. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 14.4 V at 40 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM | 800 W - Peak pulse power handling capacity; supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| IPPM | 40 A - Peak surge current capability under standardized 10/1000 µs waveform; validated with derating above 25 °C. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | AC input / signal line side | One end of symmetrical junction; connects to protected line without polarity constraint. |
| Cathode (Terminal 2) | AC input / signal line side | Other end of symmetrical junction; forms bidirectional clamping path between terminals. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Low clamping ratio (VC/VBR) | ≈1.45 - Minimizes voltage overshoot during surge, reducing risk of latch-up or gate oxide damage in downstream MOSFETs or MCUs. |
| MSL Level 1 rating | Allows unlimited floor life and single reflow at peak 260 °C without baking, simplifying SMT production flow. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress versus epoxy-passivated alternatives. |
| RoHS-compliant, halogen-free option available | E3 suffix indicates RoHS compliance; HM3 suffix adds halogen-free construction for stringent environmental compliance programs. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role: Bidirectional shunt clamp placed directly at connector entry point to divert surge energy to ground before reaching signal conditioning circuitry. Use Value: Maintains signal integrity below 14.4 V during 40 A transients, preventing false triggering or damage to 5 V or 3.3 V rail-sensitive components. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from solenoid de-energization or lightning-induced coupling. IC Role / Device Role: Primary front-end TVS on 24 V DC input channels, used in conjunction with series impedance and filtering. Use Value: Withstands repeated 800 W surges while holding clamping voltage low enough to avoid exceeding the absolute maximum ratings of optocouplers or Schmitt triggers. |
| USB Port ESD/Surge Protection | DC Power Rail Clamp |
Use Scenario: Secondary-level surge protection on USB 2.0 data lines (D+/D−) in automotive infotainment head units exposed to hot-plug and cable discharge events. IC Role / Device Role: Low-capacitance bidirectional clamp placed after common-mode choke to suppress differential-mode transients without signal distortion. Use Value: Junction capacitance <100 pF (typ.) at zero bias ensures minimal impact on 480 Mbps data eye integrity while providing 800 W surge margin. | Use Scenario: Overvoltage clamp on 12 V auxiliary power rails feeding ADAS camera modules or radar processors. IC Role / Device Role: Standoff-regulated shunt device that activates only during abnormal overvoltage (e.g., alternator regulation failure), not during normal operation. Use Value: 8.5 V VWM allows full utilization of 12 V nominal rail while clamping at 14.4 V-below typical 16 V IC absolute maximum ratings. |
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 | Same electrical specs and SMB package; differs only in tape-and-reel packaging (750 pcs vs. 3200 pcs). | No functional difference; selected when smaller reel quantity aligns with production batch size or inventory policy. | Choose SMBJ8.5CA-E3/52 for pilot runs or low-volume builds where 750-unit reels reduce WIP and shelf-life risk. |
| 1.5KE8.5CA | Higher PPPM (1500 W), larger DO-201AE package, slower thermal response, no AEC-Q101 qualification. | Suitable for non-automotive industrial power supply inputs but incompatible with space-constrained SMT layouts requiring SMB footprint. | Select 1.5KE8.5CA only for through-hole legacy designs or higher-power non-automotive applications where board area and qualification are secondary. |
Compared with SMBJ8.5CA-E3/52, SMB8J8.5CA-E3/5B offers identical protection performance in the same SMB package but with optimized 3200-unit reel logistics for high-volume SMT lines; versus 1.5KE8.5CA, it trades raw power for automotive qualification, surface-mount compatibility, and tighter thermal management-critical for modern compact electronics.
Availability
SMB8J8.5CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, USB port surge suppression, and DC power rail clamping requiring stable component supply across extended production cycles.
Supply support for SMB8J8.5CA-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8J series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-density, AEC-Q101-compliant transient suppression in automotive and harsh-environment industrial systems where fast response, low clamping, and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMB8J8.5CA-E3/5B at its rated peak pulse current?
The SMB8J8.5CA-E3/5B has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 40 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88422, ensuring predictable voltage limiting during surge events. The SMB8J8.5CA-E3/5B maintains this clamping performance across its specified operating temperature range.
Is SMB8J8.5CA-E3/5B qualified for automotive applications?
Yes, SMB8J8.5CA-E3/5B is AEC-Q101 qualified, as explicitly stated in Vishay's datasheet revision 09-Jan-2024 (Document Number 88422). This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. The "HE3" or "HM3" suffix variants are designated for automotive use, but the E3/5B variant shares the same die and qualification-confirmed by Vishay's material categorization and ordering code definitions. SMB8J8.5CA-E3/5B is approved for under-hood and chassis-mounted automotive electronics.
What is the standoff voltage (VWM) and why is it important for SMB8J8.5CA-E3/5B?
The standoff voltage (VWM) of SMB8J8.5CA-E3/5B is 8.5 V-the maximum DC or continuous peak voltage the device can withstand without entering breakdown or exceeding 1 μA leakage current. This parameter ensures the SMB8J8.5CA-E3/5B remains inactive during normal system operation (e.g., on a 5 V or 8 V signal line), avoiding power loss or signal distortion. It directly determines the maximum working voltage of the protected circuit and must be selected ≥10–20% above the system's nominal voltage to accommodate tolerances and ripple.
Does SMB8J8.5CA-E3/5B have polarity markings, and how is it mounted?
No, SMB8J8.5CA-E3/5B does not have polarity markings because it is a bidirectional TVS diode-its symmetrical structure allows installation in either orientation across a protected line. Unlike unidirectional types (e.g., SMB10J8.5A), it lacks a cathode band. Mounting follows the SMB (DO-214AA) standard: terminals soldered to 5.0 mm × 5.0 mm copper pads per Vishay's recommended layout, with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
What is the peak pulse power rating of SMB8J8.5CA-E3/5B, and how does it compare to unidirectional variants?
The SMB8J8.5CA-E3/5B has a peak pulse power rating (PPPM) of 800 W under the 10/1000 µs waveform, which is lower than the 1000 W rating of its unidirectional counterpart SMB10J8.5A. This difference arises from thermal dissipation limitations in bidirectional construction and is consistent across the SMB8J/SMB10J family. The 800 W rating remains sufficient for ISO 7637-2 and IEC 61000-4-5 compliance in most automotive and industrial applications when combined with proper PCB copper area and layout.
SMB8J8.5CA-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:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J8.5CA-E3/5B FAQ
1.How can I place an order for SMB8J8.5CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CA-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 SMB8J8.5CA-E3/5B reliable?
The price and inventory of SMB8J8.5CA-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 SMB8J8.5CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CA-E3/5B?
SMB8J8.5CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CA-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 SMB8J8.5CA-E3/5B?
For technical support, including SMB8J8.5CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CA-E3/5B requirements.
6.How does Aetrix verify that SMB8J8.5CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CA-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 SMB8J8.5CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CA-E3/5B?
All SMB8J8.5CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CA-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 SMB8J8.5CA-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J8.5CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CA-E3/5B Tags
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