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Vishay General Semiconductor - Diodes Division SMB8J8.0CAHM3/I
- Part No.:
- SMB8J8.0CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.0CAHM3/I.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,236
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Product details
Overview
SMB8J8.0CAHM3/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 8.0 V stand-off voltage (VWM), 13.6 V clamping voltage (VC) at 100 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 SMB8J8.0CAHM3/I datasheet, SMB8J8.0CAHM3/I pinout, SMB8J8.0CAHM3/I application, or SMB8J8.0CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.7), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds 8.89–9.83 V (VBR at 1 mA), it avalanches to limit downstream voltage to ≤13.6 V at 100 A surge. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM).
Thermal design relies on RθJL = 20 °C/W (junction-to-lead) and RθJA = 72 °C/W (junction-to-ambient on 5.0 mm × 5.0 mm copper pads), enabling sustained operation up to TJ = 150 °C. The SMB package supports automated placement and meets UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 8.89 V / 9.83 V at 1 mA - guaranteed avalanche initiation range for reliable turn-on margin |
| VC @ IPPM | 13.6 V at 100 A - peak clamped voltage limiting stress on protected ICs during 10/1000 µs surge |
| PPPM | 800 W - surge energy handling capacity under standardized 10/1000 µs waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max. | +150 °C - enables use in under-hood automotive and high-temperature industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical dual-anode/dual-cathode structure with center cathode band omitted per bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 / Cathode 2 | Transient conduction path (reverse polarity) | Provides clamping during negative voltage excursions relative to reference plane |
| Anode 2 / Cathode 1 | Transient conduction path (forward polarity) | Provides clamping during positive voltage excursions - enables full-cycle bidirectional protection |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal lines without polarity constraints - eliminates need for dual unidirectional devices |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance for long-term solder joint reliability |
| Low clamping ratio (VC/VWM = 1.7) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices |
| MSL Level 1 (260 °C peak reflow) | Enables standard lead-free SMT assembly without pre-baking - reduces manufacturing complexity and cost |
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 inductive switching transients in vehicle cabins. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal line and ground, responding within <1 ps to divert surge current away from ASIC inputs. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V sensor signal chains while maintaining signal fidelity due to sub-1 µA leakage at 8.0 V. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring surges, ESD events, and relay contact bounce in factory automation systems. IC Role / Device Role / Timing Role: Primary surge suppression element on 24 V DC input channels, operating in parallel with optocoupler input stages. Use Value: Enables robust operation at IP65-rated enclosures by absorbing 800 W transients without degradation - verified over 1000+ surge cycles per AEC-Q101. |
| USB Port ESD Protection | DC Power Rail Clamp |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in infotainment head units, supplementing internal IC-level protection. IC Role / Device Role / Timing Role: Fast-response shunt device that activates before internal transceiver clamps, reducing cumulative stress on PHY circuitry. Use Value: Achieves >30 kV air-gap ESD immunity (IEC 61000-4-2) with minimal capacitance impact - CJ not specified but typical for SMB bidirectional TVS is <100 pF at 0 V. |
Use Scenario: Clamping 12 V/24 V supply rails against ISO 7637-2 pulse 1/2a/5a transients in telematics control units and gateway ECUs. IC Role / Device Role / Timing Role: Standoff-regulated crowbar protecting downstream DC-DC converters and microcontrollers during battery disconnection events. Use Value: Limits rail overvoltage to 13.6 V - below absolute maximum ratings of common 16 V-input buck regulators - preventing brownout or reset faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J8.0CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification required for some Tier 1 automotive programs | Select HM3 for strict environmental compliance; E3 acceptable for commercial/industrial use |
| SMAJ8.0CA | Lower PPPM (400 W), higher VC (13.6 V same), SMA package (smaller footprint, higher RθJA) | Insufficient for 800 W surge requirements; limited thermal margin in high-power layouts | Only suitable where space constraints outweigh power-handling needs - verify derating curves |
Compared with SMB8J8.0CAHE3/I, the HM3 variant adds halogen-free assurance without performance trade-offs; versus SMAJ8.0CA, SMB8J8.0CAHM3/I delivers double the surge power rating and superior thermal dissipation in identical PCB area.
Availability
SMB8J8.0CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, USB port ESD hardening, and DC power rail clamping requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J8.0CAHM3/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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on reliability, power density, and automotive qualification.
The SMB8J8.0CAHM3/I belongs to Vishay's TRANSZORB® family - engineered specifically for high-power-density transient suppression in space-constrained, high-reliability applications such as automotive electronics and industrial controls.
FAQ
What is the clamping voltage of SMB8J8.0CAHM3/I at its rated peak pulse current?
The SMB8J8.0CAHM3/I has a maximum clamping voltage (VC) of 13.6 V when subjected to its rated peak pulse current (IPPM) of 100 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream ICs experience controlled overvoltage stress during surge events - a critical parameter confirmed in Vishay Document Number 88422, page 3.
Is SMB8J8.0CAHM3/I qualified for automotive applications?
Yes, SMB8J8.0CAHM3/I is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document Number 88422, page 1). The HM3 suffix denotes halogen-free, RoHS-compliant construction meeting automotive reliability requirements including temperature cycling, high-temperature reverse bias, and mechanical shock testing - making SMB8J8.0CAHM3/I suitable for under-hood and cabin electronics.
What does the "HM3" suffix mean in SMB8J8.0CAHM3/I?
The "HM3" suffix in SMB8J8.0CAHM3/I indicates halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, per Vishay's ordering nomenclature (page 3 of Document 88422). It distinguishes this variant from E3 (RoHS only) and HE3/HM3 automotive versions - confirming SMB8J8.0CAHM3/I meets stringent environmental and reliability standards for modern automotive supply chains.
How does SMB8J8.0CAHM3/I differ from unidirectional SMB10J8.0A?
SMB8J8.0CAHM3/I is bidirectional with 800 W PPPM and symmetric clamping for AC or floating signals, whereas SMB10J8.0A is unidirectional (1000 W PPPM) intended for DC rail protection with cathode-band polarity marking. Their VWM (8.0 V), VBR (8.89–9.83 V), and VC (13.6 V) match, but SMB8J8.0CAHM3/I lacks polarity marking and supports dual-polarity transients - critical for differential or unbiased interfaces.
What is the maximum operating temperature for SMB8J8.0CAHM3/I?
The SMB8J8.0CAHM3/I has a maximum junction temperature (TJ max.) of +150 °C, as specified in the "Maximum Ratings" table (page 1 of Vishay Document 88422). This rating enables reliable operation in high-temperature environments such as automotive engine compartments or industrial motor drives - provided PCB thermal design meets the recommended 5.0 mm × 5.0 mm copper pad layout per terminal.
SMB8J8.0CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 58.8A
- 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)
SMB8J8.0CAHM3/I FAQ
1.How can I place an order for SMB8J8.0CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.0CAHM3/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 SMB8J8.0CAHM3/I reliable?
The price and inventory of SMB8J8.0CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J8.0CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J8.0CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.0CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.0CAHM3/I?
SMB8J8.0CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.0CAHM3/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 SMB8J8.0CAHM3/I?
For technical support, including SMB8J8.0CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.0CAHM3/I requirements.
6.How does Aetrix verify that SMB8J8.0CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J8.0CAHM3/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 SMB8J8.0CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J8.0CAHM3/I?
All SMB8J8.0CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.0CAHM3/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 SMB8J8.0CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J8.0CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.0CAHM3/I Tags
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