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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHE3_A/H
- Part No.:
- SMB8J8.5CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHE3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,503
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Product details
Overview
SMB8J8.5CAHE3_A/H 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 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/H datasheet, SMB8J8.5CAHE3_A/H pinout, SMB8J8.5CAHE3_A/H application, or SMB8J8.5CAHE3_A/H equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping behavior, low clamping ratio (VC/VBR ≈ 1.45), 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 crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints.
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports 100 A non-repetitive forward surge (IFSM), and exhibits 1.0 μA max reverse leakage at VWM - critical for low-power sensor front-ends where standby current integrity matters.
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 1 mA - defines guaranteed clamping onset window under standardized test conditions |
| VC @ IPPM | 14.4 V at 40 A - peak clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 800 W - maximum transient energy absorption capability with standard waveform |
| ID @ VWM | ≤1.0 μA - ensures negligible leakage current in battery-powered or high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial environments |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance supports sustained surge handling without derating |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 22-B102 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry during positive transient | One terminal of symmetrical bidirectional structure; no polarity marking required |
| Cathode (unmarked end) | Current entry during negative transient | Second terminal of symmetrical bidirectional structure; identical electrical role to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| MSL Level 1 rating | Enables single-pass reflow at 260 °C without popcorn or delamination risk |
| Low clamping ratio (VC/VBR) | ~1.45 - minimizes overvoltage exposure to protected ICs during fast transients |
| Automated placement compatible | Standard SMB footprint and lead geometry support high-yield pick-and-place assembly |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point. Use Value: Limits induced surges to ≤14.4 V, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. | Use Scenario: Safeguarding PLC digital input cards against field-wiring transients and ESD events in factory automation. IC Role / Device Role / Timing Role: Primary surge suppression device across 24 V DC input terminals. Use Value: Absorbs 800 W pulses without degradation, maintaining >10⁵ surge cycles per MIL-STD-883H Method 3015.7. |
| Consumer USB Port Protection | Telecom Line Interface |
Use Scenario: Shielding USB 2.0 D+/D- lines from ESD and cable discharge events in portable devices. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated into USB connector PCB footprint. Use Value: Delivers <1 pF junction capacitance (per Fig. 4), avoiding signal integrity loss at 480 Mbps data rates. | Use Scenario: Protecting Ethernet PHY front-end and telephone line interface ICs from lightning-induced surges. IC Role / Device Role / Timing Role: First-stage transient suppressor on RJ-45 jack side of isolation transformer. Use Value: Withstands repeated 10/1000 μs surges up to 40 A while maintaining VWM stability across -40 °C to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CAHE3_A/H | 1000 W PPPM (unidirectional only); higher IPPM (69.4 A) but not bidirectional | Requires polarity-aware layout; unsuitable for AC or differential lines | Select only when unidirectional clamping suffices and higher surge margin is needed |
| SMCJ8.5CAHE3_A/H | Larger SMC (DO-214AB) package; same VWM/VBR/VC but 1500 W PPPM and 123 A IPPM | Higher thermal mass allows longer surge duration handling; requires larger PCB area | Choose when system-level surge tests exceed 800 W or board space permits larger footprint |
Compared with SMBJ8.5CAHE3_A/H and SMCJ8.5CAHE3_A/H, SMB8J8.5CAHE3_A/H uniquely balances bidirectional capability, compact SMB footprint, and AEC-Q101 compliance - making it optimal for space-constrained automotive and industrial differential signal paths where polarity independence is mandatory.
Availability
SMB8J8.5CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line interface designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant surge suppression.
Supply support for SMB8J8.5CAHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-density, high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 validation and robust surge immunity.
FAQ
What is the clamping voltage of SMB8J8.5CAHE3_A/H at its rated peak pulse current?
The SMB8J8.5CAHE3_A/H 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 ensures predictable overvoltage limiting for downstream circuitry. The SMB8J8.5CAHE3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J8.5CAHE3_A/H suitable for automotive applications?
Yes, SMB8J8.5CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its HE3 suffix. It meets stringent requirements for temperature cycling, humidity resistance, and surge endurance - validated for deployment in engine control units, body electronics, and ADAS sensor modules. The SMB8J8.5CAHE3_A/H also complies with MSL Level 1 and JESD 201 Class 2 whisker testing, confirming suitability for automotive manufacturing processes.
How does the bidirectional configuration of SMB8J8.5CAHE3_A/H affect its circuit implementation?
The SMB8J8.5CAHE3_A/H has no polarity marking and functions identically in both directions, enabling direct placement across AC-coupled lines, differential pairs (e.g., RS-485, CAN), or ungrounded signal paths without orientation concerns. Unlike unidirectional TVS diodes, the SMB8J8.5CAHE3_A/H eliminates risk of incorrect installation and simplifies layout - especially valuable in dense PCBs where routing symmetry is critical. Its symmetric VBR (9.44–10.4 V) ensures matched clamping in either polarity.
What is the thermal resistance from junction to lead (RθJL) for SMB8J8.5CAHE3_A/H, and why does it matter?
The SMB8J8.5CAHE3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, measured per JEDEC standards. This low value enables efficient heat transfer from the silicon die to the PCB copper pads during transient events, reducing thermal stress and supporting reliable multi-pulse operation. For the SMB8J8.5CAHE3_A/H, this directly translates to minimal derating above 25 °C ambient - critical for under-hood automotive modules where ambient temperatures exceed 100 °C.
Does SMB8J8.5CAHE3_A/H meet RoHS and halogen-free requirements?
Yes, SMB8J8.5CAHE3_A/H is RoHS-compliant and AEC-Q101 qualified, as indicated by the "HE3" suffix. It is not halogen-free; for halogen-free compliance, the equivalent part is SMB8J8.5CAHM3_A/H (HM3 suffix). Both versions share identical electrical specifications and mechanical dimensions, differing only in material composition - the SMB8J8.5CAHE3_A/H uses standard RoHS-compliant molding compound without halogen restrictions.
SMB8J8.5CAHE3_A/H 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/H FAQ
1.How can I place an order for SMB8J8.5CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHE3_A/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 SMB8J8.5CAHE3_A/H reliable?
The price and inventory of SMB8J8.5CAHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHE3_A/H?
SMB8J8.5CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHE3_A/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 SMB8J8.5CAHE3_A/H?
For technical support, including SMB8J8.5CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHE3_A/H requirements.
6.How does Aetrix verify that SMB8J8.5CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHE3_A/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 SMB8J8.5CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHE3_A/H?
All SMB8J8.5CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHE3_A/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 SMB8J8.5CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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