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Vishay General Semiconductor - Diodes Division SMB8J26CAHM3/H
- Part No.:
- SMB8J26CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J26CAHM3/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,601
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Product details
Overview
SMB8J26CAHM3/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 sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J26CAHM3/H datasheet, SMB8J26CAHM3/H pinout, SMB8J26CAHM3/H application, or SMB8J26CAHM3/H equivalent, this AEC-Q101 qualified, halogen-free, RoHS-compliant TVS diode delivers verified clamping performance, low leakage (<1.0 µA at VWM), and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level ESD and load-dump immunity design.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the low incremental surge resistance supports consistent clamping under repetitive transients.
The device is rated for -55 °C to +150 °C operating junction temperature and meets AEC-Q101 stress test requirements including HTGB, HTRB, and temperature cycling - confirming suitability for under-hood automotive environments where thermal reliability is non-negotiable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V automotive systems. |
| VBR min / max | 28.9 V / 31.9 V at 1.0 mA - guaranteed breakdown threshold range ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 42.1 V at 19.0 A - clamping voltage limits downstream IC stress during 10/1000 µs surges per ISO 7637-2 Pulse 1/2a/5a. |
| PPPM | 800 W - peak pulse power handling capacity with 10/1000 µs waveform; sufficient for CAN/LIN bus and sensor line protection. |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered modules. |
| TJ max | +150 °C - extended junction temperature rating enables placement near heat sources in engine control units and ADAS ECUs. |
| Package | SMB (DO-214AA) - surface-mount footprint with 5.59 mm × 3.94 mm outline and 2.20 mm height; compatible with standard SMT reflow profiles. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package: no polarity marking; symmetrical terminals function identically as anode/cathode depending on transient polarity. Mounting requires 5.0 mm × 5.0 mm copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode or Cathode (bidirectional) | Either terminal serves as current entry point during positive or negative transients; no fixed polarity assignment. |
| Terminal 2 | Anode or Cathode (bidirectional) | Paired terminal completing the symmetrical clamping path; enables protection of balanced lines like RS-485 or CAN differential pairs. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with HTGB, HTRB, and temperature cycling tests - eliminates qualification overhead for Tier 1 suppliers. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability - supports global environmental compliance without derating. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during surge events, reducing risk of latch-up or gate oxide damage in protected MOSFETs and microcontrollers. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without baking or special handling - reduces manufacturing cost and process complexity. |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift in harsh under-hood environments. |
Applications
| Automotive Sensor Interface Protection | CAN Bus Transceiver Protection |
|---|---|
|
Use Scenario: Protecting analog outputs of pressure, temperature, and position sensors connected to 24 V vehicle power rails. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor output and ECU input to shunt ISO 7637-2 Pulse 5a load-dump energy. Use Value: Limits voltage excursion to ≤42.1 V during 100 V/100 ms transients, preventing ADC saturation and preserving measurement accuracy. |
Use Scenario: Safeguarding CANH/CANL pins of transceivers against ESD (IEC 61000-4-2 ±25 kV) and coupled surges in body control modules. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point to clamp fast transients before reaching transceiver inputs. Use Value: Delivers sub-1 ns response and <1.0 µA leakage, maintaining CAN signal integrity up to 1 Mbps without timing jitter or bit errors. |
| Industrial PLC Analog Input Protection | Smart Actuator Power Line Protection |
|
Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring induced surges. IC Role / Device Role / Timing Role: Series-connected bidirectional TVS on loop supply line to absorb 1 kV/500 A surge pulses per IEC 61000-4-5. Use Value: Withstands 800 W peak pulse power and maintains VWM = 26 V, ensuring loop stability during repeated transient events. |
Use Scenario: Protecting H-bridge driver power rails in electric valve actuators subjected to inductive kickback from solenoid coils. IC Role / Device Role / Timing Role: Parallel-mounted TVS across motor supply rail to clamp flyback voltages exceeding 26 V during PWM switching transitions. Use Value: Clamps to 42.1 V within nanoseconds, preventing overvoltage failure of gate drivers and enabling reliable 100 kcycle+ actuator operation. |
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/H | Same electrical specs and SMB package; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker rating. | Suitable for commercial/industrial designs where halogen-free requirement is absent and whisker resistance is not mandated. | Select when cost optimization is prioritized over automotive environmental compliance. |
| SMAJ26CA | Lower PPPM (400 W), higher VC (44.0 V), same VWM; SMA (DO-214AC) package with smaller pad area (3.5 mm × 2.7 mm). | Limited to lower-energy transients; reduced thermal mass increases risk of thermal runaway under repeated 26 V surges. | Use only in space-constrained consumer applications with infrequent, low-energy transients - not for automotive or industrial duty cycles. |
Compared with SMB8J26CAHE3/H, the SMB8J26CAHM3/H adds halogen-free construction and whisker resistance for automotive qualification; versus SMAJ26CA, it delivers double the surge power handling and tighter clamping in a thermally superior SMB package - making it the sole choice for AEC-Q101-compliant 24 V system protection.
Availability
SMB8J26CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and smart actuator power stages requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMB8J26CAHM3/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 AEC-Q101-compliant transient protection in 24 V automotive systems, emphasizing robust clamping, thermal resilience, and process consistency for mission-critical electronic control units.
FAQ
What is the clamping voltage of SMB8J26CAHM3/H at its rated peak pulse current?
The SMB8J26CAHM3/H has a maximum clamping voltage (VC) of 42.1 V at 19.0 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience voltage excursions beyond 42.1 V during standardized surge events - a key parameter for ensuring compatibility with 3.3 V or 5 V logic interfaces downstream of the SMB8J26CAHM3/H.
Is SMB8J26CAHM3/H suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMB8J26CAHM3/H is explicitly AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HM3" (halogen-free, RoHS-compliant, AEC-Q101). It undergoes HTGB, HTRB, and temperature cycling tests per the standard, and its SMB package meets MSL Level 1 - making SMB8J26CAHM3/H appropriate for under-hood ECUs, ADAS sensors, and body control modules where automotive-grade reliability is mandatory.
How does the bidirectional configuration of SMB8J26CAHM3/H benefit differential signal protection?
The bidirectional architecture of SMB8J26CAHM3/H allows identical clamping behavior for both positive- and negative-polarity transients, making it ideal for protecting differential buses like CAN, LIN, or RS-485. Unlike unidirectional TVS diodes, SMB8J26CAHM3/H eliminates the need for dual-device configurations or polarity-aware layout - simplifying PCB design while ensuring symmetrical surge suppression on both signal lines without introducing skew or imbalance.
What is the maximum reverse leakage current specified for SMB8J26CAHM3/H at its stand-off voltage?
The SMB8J26CAHM3/H specifies a maximum reverse leakage current (ID) of 1.0 µA at its 26 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves signal fidelity in high-impedance sensor circuits and minimizes quiescent power draw in battery-operated automotive modules - a critical advantage over alternatives with leakage >5 µA that can degrade accuracy or reduce sleep-mode battery life.
Does SMB8J26CAHM3/H require special PCB layout considerations compared to other SMB-packaged TVS diodes?
Yes - Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W pulse power dissipation. Smaller pads increase thermal impedance and risk premature failure under repeated surges. The SMB8J26CAHM3/H also requires no polarity marking on PCB silkscreen due to its bidirectional symmetry, but must be placed with adequate clearance from adjacent thermal masses to maintain junction temperature below +150 °C during worst-case transient events.
SMB8J26CAHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMB8J26CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J26CAHM3/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/H reliable?
The price and inventory of SMB8J26CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMB8J26CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J26CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J26CAHM3/H?
SMB8J26CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J26CAHM3/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/H?
For technical support, including SMB8J26CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J26CAHM3/H requirements.
6.How does Aetrix verify that SMB8J26CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J26CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMB8J26CAHM3/H?
All SMB8J26CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J26CAHM3/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/H part is unused and in its original packaging.
Return procedure for SMB8J26CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J26CAHM3/H Tags
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