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Vishay General Semiconductor - Diodes Division SMB8J26CAHM3_A/H
- Part No.:
- SMB8J26CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J26CAHM3_A/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,423
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Product details
Overview
SMB8J26CAHM3_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 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 - optimized for automotive-grade ESD and load-dump protection in sensor interfaces and power supply rails.
For engineers reviewing the SMB8J26CAHM3_A/H datasheet, SMB8J26CAHM3_A/H pinout, SMB8J26CAHM3_A/H application, or SMB8J26CAHM3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional symmetry, low clamping ratio (VC/VWM ≈ 1.62), and compatibility with automated SMT assembly on standard 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional conduction enabling suppression of both positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Thermal performance is defined by RθJA = 72 °C/W (typ.) and RθJL = 20 °C/W (typ.), supporting operation up to +150 °C junction temperature. It meets MSL Level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - guaranteed breakdown onset window; ensures consistent turn-on across production lots. |
| VC @ IPPM | 42.1 V at 19.0 A - clamping voltage during 10/1000 µs surge; limits downstream voltage stress to safe levels. |
| PPPM | 800 W - peak pulse power handling capability; supports robust protection against ISO 7637-2 Pulse 1/2/5a/b surges. |
| ID @ VWM | 1.0 µA - ultra-low leakage at stand-off voltage; prevents signal distortion or power loss in high-impedance circuits. |
| TJ max. | +150 °C - maximum junction temperature rating; enables deployment in under-hood automotive environments. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 2.2 mm height; compatible with IPC-7351B footprint. |
Pinout & Package
Two-terminal SMB (DO-214AA) package with no polarity marking for bidirectional operation; cathode band absent - terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Either terminal conducts during overvoltage events in either polarity; no DC bias dependency. |
| Case (cathode band omitted) | Mechanical reference / thermal path | No electrical connection; serves as primary heat sink interface to PCB copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power rails. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance requirements without compromising surge robustness or thermal stability. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected ICs. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow soldering without moisture-related delamination or parametric shift. |
| Glass-passivated junction | Ensures stable VBR over time and temperature, critical for long-life deployments in industrial and automotive systems. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceivers and MEMS pressure sensors from load dump and inductive switching spikes in vehicle body electronics. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed across differential bus lines or supply-to-ground to limit transient excursions. Use Value: Prevents communication failure and sensor drift by holding clamped voltage below 42.1 V during 19 A surges - within safe margin of 5 V/3.3 V logic thresholds. |
Use Scenario: Safeguarding RS-485/CAN FD physical layer transceivers in factory automation PLCs exposed to motor drive noise and ground bounce. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical), fast-response TVS shunting common-mode surges between bus lines and chassis ground. Use Value: Maintains signal integrity with <1.0 µA leakage at 26 V, avoiding false triggering while surviving repeated 800 W pulses per ISO 16750-2. |
| Power Supply Input Protection | Consumer USB-C Port Protection |
|
Use Scenario: Front-end surge suppression on 24 V DC input rails of embedded controllers in HVAC and lighting systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converters and LDOs to prevent catastrophic failure during lightning-induced surges. Use Value: Handles 800 W peak power with 42.1 V clamping - sufficient to protect 36 V-rated input stages without derating or parallel staging. |
Use Scenario: Bidirectional ESD and surge protection on USB-C CC and VBUS lines in portable docking stations and monitors. IC Role / Device Role / Timing Role: Fast-acting TVS absorbing ±15 kV contact ESD (IEC 61000-4-2) and 10/1000 µs surges up to 800 W. Use Value: AEC-Q101 qualification ensures reliability under thermal cycling and vibration - critical for consumer devices with multi-year field life. |
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/H | Same electrical specs, but RoHS-compliant without halogen-free certification; non-AEC-Q101 rated. | Approved for commercial/industrial use only; not validated for automotive temperature cycling or lifetime testing. | Select when halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMAJ26CA | Lower PPPM (400 W), higher VC (44.0 V), same VWM; SMA package (smaller thermal mass). | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) in automotive. | Choose only for space-constrained, non-automotive designs where 400 W surge capacity suffices. |
Compared with SMB8J26CAHM3_A/H, the HE3 variant lacks halogen-free and AEC-Q101 validation, while SMAJ26CA trades 50% peak power and higher clamping for smaller footprint - making SMB8J26CAHM3_A/H the sole choice for AEC-Q101-compliant, high-power bidirectional protection in SMB form factor.
Availability
SMB8J26CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, and 24 V power supply inputs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMB8J26CAHM3_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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMB8JxxCA series targets high-energy transient suppression in harsh environments, with design emphasis on AEC-Q101 compliance, low clamping voltage, and robust surge endurance for automotive power and data lines.
FAQ
What is the clamping voltage of SMB8J26CAHM3_A/H at its rated peak pulse current?
The SMB8J26CAHM3_A/H has a maximum clamping voltage (VC) of 42.1 V at 19.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience voltages exceeding 42.1 V during specified surge events - a critical parameter for ensuring compatibility with 36 V-rated downstream components.
Is SMB8J26CAHM3_A/H suitable for automotive applications?
Yes, SMB8J26CAHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly rated for automotive use per Vishay's qualification program, supporting operation from -55 °C to +150 °C junction temperature and passing required temperature cycling, mechanical shock, and humidity tests - making it appropriate for engine control, ADAS, and body electronics.
How does the bidirectional configuration of SMB8J26CAHM3_A/H affect its circuit placement?
The SMB8J26CAHM3_A/H has no polarity marking and functions identically in either orientation, allowing placement across any two nodes requiring symmetrical overvoltage protection - such as between CAN_H/CAN_L, VBUS/GND in USB-C, or AC signal lines. This eliminates orientation errors during automated assembly and simplifies layout versus unidirectional TVS diodes that require strict cathode alignment.
What is the thermal resistance of SMB8J26CAHM3_A/H, and how does it impact PCB layout?
SMB8J26CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. To achieve rated power dissipation, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad area or omitting thermal vias increases junction temperature and de-rates surge capability - so layout must follow Vishay's recommended footprint.
Does SMB8J26CAHM3_A/H meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMB8J26CAHM3_A/H is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This allows indefinite floor life and compatibility with standard lead-free reflow profiles without baking - a key advantage for high-volume SMT manufacturing where moisture-induced popcorning must be avoided.
SMB8J26CAHM3_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):
- 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/H FAQ
1.How can I place an order for SMB8J26CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J26CAHM3_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 SMB8J26CAHM3_A/H reliable?
The price and inventory of SMB8J26CAHM3_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 SMB8J26CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J26CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J26CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J26CAHM3_A/H?
SMB8J26CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J26CAHM3_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 SMB8J26CAHM3_A/H?
For technical support, including SMB8J26CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J26CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J26CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J26CAHM3_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 SMB8J26CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J26CAHM3_A/H?
All SMB8J26CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J26CAHM3_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 SMB8J26CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMB8J26CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J26CAHM3_A/H Tags
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