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Vishay General Semiconductor - Diodes Division SMB8J26CAHM3_A/I
- Part No.:
- SMB8J26CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J26CAHM3_A/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,164
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Product details
Overview
SMB8J26CAHM3_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 26 V standoff voltage (VWM), 42.1 V maximum clamping voltage (VC) at 19.0 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 SMB8J26CAHM3_A/I datasheet, SMB8J26CAHM3_A/I pinout, SMB8J26CAHM3_A/I application, or SMB8J26CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low incremental surge resistance, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding to transients within picoseconds via avalanche breakdown. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints, and its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) across -55 °C to +150 °C operating range.
The SMB8J26CAHM3_A/I delivers 800 W peak pulse power under standardized 10/1000 µs surge conditions, with thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting reliable operation in thermally constrained PCB layouts when mounted per recommended pad dimensions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 28.9 V / 31.9 V at 1.0 mA - verified breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 42.1 V at 19.0 A - clamping voltage limits downstream IC stress during 800 W transient surges. |
| PPPM | 800 W - peak power handling capacity per 10/1000 µs waveform, validated per ANSI/IEEE C62.35. |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive and industrial environments. |
| Qualification | AEC-Q101 qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity: bidirectional - no marking on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient current return path | Both terminals are symmetrical; either serves as current sink during positive or negative transients - no polarity dependency. |
| Anode (Cathode) | Transient current return path | Identical function to opposite terminal; enables bidirectional clamping without orientation constraints during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC, differential, or floating lines without polarity-sensitive layout - eliminates need for dual unidirectional devices. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and infotainment interfaces. |
| Low clamping ratio (VC/VBR ≈ 1.47) | Minimizes overvoltage overshoot during surge events - critical for safeguarding 3.3 V or 5 V logic interfaces. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without moisture sensitivity concerns - compatible with high-volume SMT lines. |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and lifetime stress conditions. |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs from load dump and inductive switching transients in vehicle body control modules. IC Role / Device Role / Timing Role: Shunt TVS element placed directly at connector entry point to clamp surges before reaching transceiver ESD structure. Use Value: Limits clamped voltage to 42.1 V while absorbing 800 W pulses - prevents latch-up and permanent damage to ISO 11898-compliant PHYs. |
Use Scenario: Safeguarding RS-485/CAN FD physical layer nodes against EFT and surge in factory automation PLCs and motor drives. IC Role / Device Role / Timing Role: Bidirectional line protector on differential bus pairs (CAN_H/CAN_L), co-located with common-mode choke. Use Value: Symmetrical clamping maintains signal integrity during ±2 kV EFT bursts - avoids data corruption without adding propagation delay. |
| Consumer USB Type-C Port | Telecom DSL Line Interface |
|
Use Scenario: Overvoltage protection for VBUS and CC lines in USB-C receptacles exposed to hot-plug and cable-induced transients. IC Role / Device Role / Timing Role: Primary front-end TVS on each protected line, placed before port controller and power delivery IC. Use Value: Sub-1 µA leakage at 26 V VWM prevents false CC detection; 42.1 V VC ensures compliance with USB PD 3.1 voltage tolerance windows. |
Use Scenario: Surge suppression on POTS/DSL line cards subjected to lightning-induced surges up to 10/700 µs per ITU-T K.20/21. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), providing fast-response clamping for residual energy. Use Value: 19.0 A IPPM capability handles residual 10/1000 µs tail currents after GDT conduction - reduces follow-on current risk in hybrid protectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J26CAHE3_A/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 certification. | Restricted to commercial-grade industrial or consumer applications where automotive qualification is not required. | Select when cost sensitivity outweighs halogen-free or automotive qualification requirements. |
| SMAJ26CA-M3/5B | Lower PPPM (400 W), larger SMA package (DO-214AC), same VWM/VC specs; halogen-free, RoHS-compliant. | Higher board footprint and lower power density; suitable only where thermal derating allows reduced surge margin. | Choose only if SMB footprint is unavailable and 400 W peak power suffices for system-level threat model. |
Compared with SMB8J26CAHE3_A/I and SMAJ26CA-M3/5B, the SMB8J26CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, and 800 W surge capacity in the compact SMB outline - making it the sole option meeting full automotive Tier-1 ECU protection requirements without layout compromise.
Availability
SMB8J26CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, and telecom DSL line cards requiring stable component supply with guaranteed long-term manufacturability and AEC-Q101 traceability.
Supply support for SMB8J26CAHM3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-power-density solutions for automotive and industrial markets.
The SMB8J26CAHM3_A/I belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for robust transient suppression in space-constrained, thermally demanding applications such as automotive ECUs and industrial communication ports.
FAQ
What is the clamping voltage of SMB8J26CAHM3_A/I at its rated peak pulse current?
The SMB8J26CAHM3_A/I has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current (IPPM) of 19.0 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case device behavior at TA = 25 °C with proper PCB thermal management - critical for ensuring downstream ICs remain within absolute maximum ratings during surge events. The SMB8J26CAHM3_A/I maintains this performance across its full operating temperature range.
Is SMB8J26CAHM3_A/I suitable for automotive applications?
Yes, SMB8J26CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HM3" indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets requirements for temperature cycling, high-temperature reverse bias, and ESD robustness per AEC-Q101 Rev D. The SMB8J26CAHM3_A/I is deployed in engine control units, ADAS camera modules, and body electronics where sustained operation at +125 °C ambient and immunity to load-dump transients are mandatory.
How does the bidirectional configuration of SMB8J26CAHM3_A/I affect circuit layout?
The SMB8J26CAHM3_A/I has symmetrical bidirectional characteristics - both terminals perform identically during positive or negative transients - so no polarity marking or orientation constraint exists during placement. This eliminates orientation errors in automated assembly and simplifies routing on differential or AC-coupled lines like CAN, RS-485, or audio interfaces. The SMB8J26CAHM3_A/I requires no additional biasing or external components to enable bidirectional protection, reducing BOM count and layout complexity.
What is the maximum reverse leakage current for SMB8J26CAHM3_A/I at its standoff voltage?
The SMB8J26CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its 26 V standoff voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures minimal impact on high-impedance sensor inputs or battery-powered circuits, preserving signal fidelity and extending operational battery life. Leakage remains below 5.0 µA across the full -55 °C to +150 °C junction temperature range, as verified in Vishay's characterization data for the SMB8J26CAHM3_A/I.
Does SMB8J26CAHM3_A/I require special PCB layout considerations for thermal performance?
Yes - optimal thermal performance for SMB8J26CAHM3_A/I requires mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This pad area supports its 72 °C/W junction-to-ambient thermal resistance and prevents thermal runaway during repetitive surge events. The SMB8J26CAHM3_A/I also benefits from internal copper pours or thermal vias beneath the package to enhance heat dissipation, especially in enclosed enclosures or high-ambient-temperature environments.
SMB8J26CAHM3_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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 19A
- 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)
SMB8J26CAHM3_A/I FAQ
1.How can I place an order for SMB8J26CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J26CAHM3_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 SMB8J26CAHM3_A/I reliable?
The price and inventory of SMB8J26CAHM3_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 SMB8J26CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J26CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J26CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J26CAHM3_A/I?
SMB8J26CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J26CAHM3_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 SMB8J26CAHM3_A/I?
For technical support, including SMB8J26CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J26CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J26CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J26CAHM3_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 SMB8J26CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J26CAHM3_A/I?
All SMB8J26CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J26CAHM3_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 SMB8J26CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J26CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J26CAHM3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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