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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHM3_A/I
- Part No.:
- SMB8J8.5CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHM3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,360
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Product details
Overview
SMB8J8.5CAHM3_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, and 800 W peak pulse power (10/1000 µs waveform), making it suitable for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J8.5CAHM3_A/I datasheet, SMB8J8.5CAHM3_A/I pinout, SMB8J8.5CAHM3_A/I application, or SMB8J8.5CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.69), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped shunt protector with symmetrical avalanche breakdown in both polarities. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), fast response time (<1 ps), and low incremental surge resistance - critical for suppressing ESD (IEC 61000-4-2) and lightning-induced transients (IEC 61000-4-5).
Thermal performance is defined by RθJA = 72 °C/W (on 0.2" × 0.2" copper pads) and TJ(max) = +150 °C, enabling reliable operation in under-hood automotive environments. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; sets upper limit for safe DC bias on protected line |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - defines guaranteed avalanche onset range; ensures consistent triggering across temperature and unit variation |
| VC @ IPPM | 14.4 V at 40 A (10/1000 µs) - clamping voltage seen by downstream circuit during worst-case surge; limits stress on IC inputs |
| PPPM | 800 W - peak pulse power handling capacity; determines survivability against 10/1000 µs surges per IEC 61000-4-5 |
| IPPM | 40 A - maximum non-repetitive peak pulse current; used to size PCB trace width and verify margin vs. system surge profile |
| TJ(max) | +150 °C - maximum junction temperature; supports operation in engine control units and ADAS modules with high ambient thermal load |
| AEC-Q101 | Qualified - validated for automotive applications including temperature cycling, HTRB, and mechanical shock per AEC standard |
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); cathode band absent per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; enables protection of AC-coupled or floating lines without orientation constraints |
| Case (cathode band omitted) | Non-polarized package body | Eliminates assembly errors in automated placement; compatible with standard SMB pick-and-place tooling and reflow profiles |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling (-55 °C to +150 °C), HTRB, and mechanical shock |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-20 MSL Level 1 and JESD201 Class 2 whisker resistance; supports green manufacturing and end-of-life compliance |
| Low clamping ratio (VC/VWM = 1.69) | Minimizes overvoltage exposure to protected ICs - e.g., keeps 3.3 V or 5 V logic inputs below absolute maximum ratings during surge |
| Fast response time (<1 ps) | Clamps transients before they propagate through PCB traces or reach sensitive gate oxides in MOSFETs or microcontrollers |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without baking; reduces production cost and avoids moisture-related popcorning defects |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping induced spikes before reaching MCU ADC or LIN transceiver. Use Value: Maintains signal integrity during 12 V system load dump events (up to 60 V, 400 ms), preventing false readings or latch-up in 5 V-tolerant sensor front-ends. |
Use Scenario: Safeguarding PLC digital input channels exposed to relay coil flyback and motor drive noise in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across input terminals to absorb ±1 kV/500 A surges per IEC 61000-4-5 Level 3. Use Value: Enables robust 24 V DC input operation with <15 V clamping, ensuring optocoupler or Schmitt-trigger input remains within safe operating area during repetitive switching transients. |
| USB Port ESD Protection | DC Power Rail Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in infotainment head units subjected to IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed after primary common-mode choke, limiting differential-mode overshoot. Use Value: Clamps ESD events to <15 V within <1 ps, preventing damage to USB PHY transceivers while maintaining signal rise/fall times for 480 Mbps operation. |
Use Scenario: Protecting 12 V auxiliary power rails feeding camera modules or radar sensors in ADAS systems from battery line transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on VIN rail, triggered only during overvoltage events exceeding 8.5 V, diverting surge energy to ground. Use Value: Absorbs up to 800 W of surge energy (10/1000 µs), preventing brownout or reset of downstream DC/DC converters during ISO 16750-2 pulse 5a/b events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J8.5CAHE3_A/I | Same electrical specs but RoHS-compliant (E3), not halogen-free; lacks AEC-Q101 qualification | Approved for commercial/industrial use only; not certified for automotive production | Select when AEC-Q101 is not required and halogen-free content is not mandated by OEM specification |
| SMAJ8.5CA-M3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC but higher RθJA (90 °C/W) | Suitable for space-constrained consumer electronics; derates faster above 25 °C ambient | Choose for cost-sensitive, non-automotive designs where board space is limited and surge energy is ≤400 W |
Compared with SMB8J8.5CAHM3_A/I, the HE3 variant trades automotive qualification and halogen-free status for lower cost, while the SMAJ8.5CA-M3 sacrifices power handling and thermal performance for footprint reduction - making SMB8J8.5CAHM3_A/I the optimal choice for AEC-Q101–mandated, high-energy automotive protection.
Availability
SMB8J8.5CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O modules, USB port hardening, and DC power rail surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J8.5CAHM3_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, power density, and automotive-grade validation.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, bidirectional surge suppression in harsh automotive and industrial environments where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J8.5CAHM3_A/I at its rated peak pulse current?
The SMB8J8.5CAHM3_A/I has a maximum clamping voltage (VC) of 14.4 V at 40 A peak pulse current (10/1000 µs waveform). This value is measured under standardized surge conditions and represents the upper voltage limit imposed on the protected circuit during worst-case transient events. The low VC ensures compatibility with 3.3 V and 5 V logic interfaces while maintaining margin below typical IC absolute maximum ratings. SMB8J8.5CAHM3_A/I's clamping performance is verified across -55 °C to +125 °C operating range.
Is SMB8J8.5CAHM3_A/I suitable for automotive applications?
Yes, SMB8J8.5CAHM3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), meeting requirements for under-hood and cabin electronics. It undergoes rigorous testing including temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock. Its 150 °C maximum junction temperature and stable VBR drift support deployment in engine control units, ADAS cameras, and body control modules. SMB8J8.5CAHM3_A/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
How does the HM3 suffix differ from E3 or HE3 in SMB8J8.5CAHM3_A/I?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS-compliant, commercial grade) and HE3 (RoHS-compliant + AEC-Q101, but not halogen-free). HM3 ensures compliance with automotive OEM restrictions on brominated flame retardants and supports green manufacturing mandates. All three share identical electrical parameters and SMB package dimensions, but only HM3 satisfies full Tier-1 automotive material declarations. SMB8J8.5CAHM3_A/I is the only variant approved for safety-critical automotive subsystems requiring halogen-free content.
What is the maximum reverse leakage current for SMB8J8.5CAHM3_A/I at its stand-off voltage?
At VWM = 8.5 V and TA = 25 °C, the SMB8J8.5CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage preserves signal integrity on high-impedance sensor lines and minimizes standby power loss in battery-powered systems. Leakage remains below 5 µA up to 125 °C ambient, verified per Vishay's characterization data. The value is measured with DC bias applied - no AC or transient conditions affect this specification. SMB8J8.5CAHM3_A/I's leakage performance supports precision analog front-ends in automotive and industrial applications.
Can SMB8J8.5CAHM3_A/I be used in bidirectional signal lines like RS-485 or CAN?
Yes, SMB8J8.5CAHM3_A/I is inherently bidirectional and commonly deployed on differential buses such as RS-485 and CAN FD. Its symmetrical VBR and VC characteristics protect both signal polarities equally, making it ideal for clamping common-mode transients without distorting differential signaling. Layout best practices include placing one device across the pair (A–B) and optionally adding line-to-ground devices. SMB8J8.5CAHM3_A/I's 14.4 V clamping ensures receiver inputs remain within safe operating area during IEC 61000-4-4 bursts. It is referenced in Vishay's RS-485 protection reference designs.
SMB8J8.5CAHM3_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:
- 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)
SMB8J8.5CAHM3_A/I FAQ
1.How can I place an order for SMB8J8.5CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHM3_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 SMB8J8.5CAHM3_A/I reliable?
The price and inventory of SMB8J8.5CAHM3_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 SMB8J8.5CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHM3_A/I?
SMB8J8.5CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHM3_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 SMB8J8.5CAHM3_A/I?
For technical support, including SMB8J8.5CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J8.5CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHM3_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 SMB8J8.5CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHM3_A/I?
All SMB8J8.5CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHM3_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 SMB8J8.5CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CAHM3_A/I Tags
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