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Vishay General Semiconductor - Diodes Division SMB8J26CAHM3_B/H
- Part No.:
- SMB8J26CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J26CAHM3_B/H.pdf
- Description:
- 800W,26V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,716
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Product details
Overview
SMB8J26CAHM3_B/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 a 26 V stand-off 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_B/H datasheet, SMB8J26CAHM3_B/H pinout, SMB8J26CAHM3_B/H application, or SMB8J26CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1.0 μA max reverse leakage at VWM, and compatibility with automated SMT assembly 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 operation and qualified to AEC-Q101, SMB8J26CAHM3_B/H supports automotive-grade reliability with MSL level 1 moisture sensitivity and halogen-free, RoHS-compliant construction (HM3 suffix). Thermal resistance is 72 °C/W junction-to-ambient under standard PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range in protected circuit |
| VBR min/max | 28.9 V / 31.9 V at 1.0 mA - breakdown threshold tolerance ensures consistent turn-on across production lots |
| VC @ IPPM | 42.1 V at 19.0 A - clamping voltage limits downstream IC stress during 10/1000 μs surge events |
| PPPM | 800 W - peak transient energy absorption capacity per single event, derated above 25 °C ambient |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes |
| TJ max | +150 °C - enables placement near heat sources in engine control units and power inverters |
| Package | SMB (DO-214AA) - industry-standard 2-pin surface-mount outline with 2.20 mm height and 5.59 mm length |
Pinout & Package
SMB8J26CAHM3_B/H uses the SMB (DO-214AA) package: a 2-terminal, non-polarized surface-mount case with matte tin-plated leads solderable per J-STD-002. Bidirectional construction means no cathode marking; terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; bidirectional clamping occurs regardless of voltage polarity applied |
| Case (exposed metal slug) | Thermal conduction path | Not electrically connected; provides mechanical stability and aids heat dissipation into PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and ADAS sensor interfaces per stress test requirements |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance for long-term reliability |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking or special handling |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
| 800 W PPPM with 10/1000 μs waveform | Handles ISO 7637-2 Pulse 1, 2a, and 5a surges in 12 V automotive systems |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and inductive switching transients in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching PHY layer. Use Value: Maintains signal integrity below 42.1 V clamping while surviving repeated 800 W surges - critical for ASIL-B compliant designs. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Primary front-end TVS on field-side termination, coordinated with series impedance and filtering. Use Value: 1.0 μA leakage at 26 V VWM prevents false triggering in high-impedance sensing circuits over temperature. |
| Consumer USB Port Protection | Telecom Line Interface |
Use Scenario: Shielding USB 2.0 data lines (D+/D−) against contact ESD per IEC 61000-4-2 ±15 kV air discharge. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to connector, minimizing stub length. Use Value: Sub-1 ns response ensures clamping initiates before ESD pulse edge reaches protected transceiver. |
Use Scenario: Protecting analog subscriber line interface circuits (SLIC) in VoIP gateways from lightning-induced surges on POTS lines. IC Role / Device Role / Timing Role: First-stage protector upstream of gas discharge tube (GDT), absorbing initial fast-rising energy. Use Value: 42.1 V VC limits voltage seen by secondary GDT and SLIC IC to within safe SOA boundaries. |
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_B/H | 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 when compliance with JESC Q001-001 or customer-specific halogen bans is mandatory |
| SMAJ26CA | Lower PPPM (400 W), larger SMA package (DO-214AC), higher RθJA (90 °C/W) | Insufficient for ISO 7637-2 Pulse 5a; less thermal margin in compact layouts | Use only in cost-sensitive, lower-energy applications where footprint and thermal performance are secondary |
Compared with SMB8J26CAHE3_B/H, SMB8J26CAHM3_B/H adds halogen-free assurance without electrical trade-offs; versus SMAJ26CA, it delivers double the surge power rating and superior thermal performance in the same PCB area.
Availability
SMB8J26CAHM3_B/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, AEC-Q101 compliance, and halogen-free manufacturing.
Supply support for SMB8J26CAHM3_B/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 application-specific optimization.
SMB8J26CAHM3_B/H belongs to Vishay's TRANSZORB® TVS family, engineered for high-power-density transient suppression in harsh environments - particularly targeting automotive, industrial, and communications infrastructure where robustness and qualification matter.
FAQ
What is the clamping voltage of SMB8J26CAHM3_B/H at its rated peak pulse current?
The SMB8J26CAHM3_B/H has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current (IPPM) of 19.0 A using the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting during surge events. The clamping behavior is bidirectional, meaning it applies equally for positive and negative transients. This VC specification directly determines the maximum stress imposed on downstream ICs during protection activation.
Is SMB8J26CAHM3_B/H qualified for automotive use?
Yes, SMB8J26CAHM3_B/H is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, ADAS sensors, and body electronics. The HM3 suffix denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements. It also complies with MSL Level 1 (peak 260 °C), enabling compatibility with standard lead-free reflow processes used in automotive PCB assembly. These qualifications are verified per the Vishay document 88422 revision 09-Jan-2024.
What does the "HM3" suffix mean in SMB8J26CAHM3_B/H?
The "HM3" suffix in SMB8J26CAHM3_B/H indicates halogen-free, RoHS-compliant construction per Vishay's material categorization standards (see doc?99912). It distinguishes this variant from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) versions. HM3 parts meet JEDEC JESD201 Class 2 whisker testing and are certified for use in environmentally regulated markets requiring halogen bans - such as certain European automotive Tier 1 programs and green electronics initiatives. The electrical and thermal specifications remain identical to non-HM3 variants in the same SMB8J26CA family.
How does SMB8J26CAHM3_B/H differ from unidirectional variants like SMB10J26A?
SMB8J26CAHM3_B/H is bidirectional with symmetrical clamping for AC or differential signals, whereas SMB10J26A is unidirectional and conducts only in reverse bias. SMB8J26CAHM3_B/H has lower peak pulse power (800 W vs 1000 W) and higher clamping voltage (42.1 V vs 42.1 V same, but at lower IPPM of 19.0 A vs 23.8 A), reflecting its dual-path design. It also lacks polarity marking - unlike SMB10J26A, which uses a cathode band. Both share the SMB package and AEC-Q101 qualification when specified with HE3/HM3 suffixes, but SMB8J26CAHM3_B/H is selected specifically for applications needing polarity-agnostic protection.
What PCB pad layout is recommended for optimal thermal performance of SMB8J26CAHM3_B/H?
Vishay specifies a minimum 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pad area for each terminal of SMB8J26CAHM3_B/H to achieve rated power dissipation and thermal resistance (RθJA = 72 °C/W). The pad layout must follow the dimensions shown in Figure "Mounting Pad Layout" of document 88422: 0.086" (2.18 mm) min width, 0.220" (5.59 mm) reference length, and 0.060" (1.52 mm) min spacing between pads. Use of internal ground planes and thermal vias beneath the pads further reduces junction temperature during repetitive surge events.
SMB8J26CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- 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_B/H FAQ
1.How can I place an order for SMB8J26CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J26CAHM3_B/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 SMB8J26CAHM3_B/H reliable?
The price and inventory of SMB8J26CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J26CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J26CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J26CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J26CAHM3_B/H?
SMB8J26CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J26CAHM3_B/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 SMB8J26CAHM3_B/H?
For technical support, including SMB8J26CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J26CAHM3_B/H requirements.
6.How does Aetrix verify that SMB8J26CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J26CAHM3_B/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 SMB8J26CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J26CAHM3_B/H?
All SMB8J26CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J26CAHM3_B/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 SMB8J26CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMB8J26CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J26CAHM3_B/H Tags
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