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Vishay General Semiconductor - Diodes Division SMBJ26CAHM3_B/I
- Part No.:
- SMBJ26CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CAHM3_B/I.pdf
- Description:
- 600W,26V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
SMBJ26CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features 26 V standoff voltage (VWM), 42.1 V maximum clamping voltage (VC) at 14.3 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), protecting sensitive ICs and MOSFETs in industrial sensor interfaces.
For engineers reviewing the SMBJ26CAHM3_B/I datasheet, SMBJ26CAHM3_B/I pinout, SMBJ26CAHM3_B/I application, or SMBJ26CAHM3_B/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low leakage (<1.0 µA at VWM), and AEC-Q101 qualification (via HM3 suffix) are required in automotive-grade commercial designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical breakdown (VBR min/max = 28.9 V / 31.9 V at 1.0 mA test current) and clamping behavior. Its glass-passivated junction ensures stable surge response and low incremental surge resistance, critical for repeatable transient suppression under repetitive 0.01% duty cycle conditions.
The device meets MSL Level 1 per J-STD-020 (reflow peak 260 °C), uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is halogen-free and RoHS-compliant per Vishay HM3 specification - confirming suitability for high-reliability automated SMT assembly without marking or polarity ambiguity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 28.9 V / 31.9 V at 1.0 mA - Confirmed bidirectional breakdown range; ensures symmetrical overvoltage triggering in either direction. |
| VC @ IPPM | 42.1 V at 14.3 A - Clamped voltage during 10/1000 µs surge; limits downstream stress to ≤42.1 V under worst-case 600 W transient. |
| IPPM | 14.3 A - Peak surge current capability; determines minimum trace width and PCB copper pad sizing (0.2" × 0.2") for thermal management. |
| PPPM | 600 W - Peak pulse power rating (10/1000 µs); validates protection against IEC 61000-4-5 Level 4 surges when properly mounted. |
| ID @ VWM | <1.0 µA - Reverse leakage at standoff voltage; ensures negligible standby power loss and signal integrity in high-impedance sensor lines. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive or industrial enclosures without derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction with cathode/anode terminals interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Completes clamping loop during positive or negative transients; connects to protected line or ground reference depending on topology. |
| Cathode | Transient return path (bidirectional) | Functionally identical to Anode in bidirectional configuration; no fixed polarity - terminals are electrically symmetric. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Combination Wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) when PCB layout follows recommended 0.2" × 0.2" copper pads. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics use including body control modules and sensor nodes requiring extended temperature cycling (-55 °C to +150 °C) and mechanical shock reliability. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking - reduces manufacturing overhead in high-volume SMT lines. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during fast transients; protects 3.3 V or 5 V logic interfaces with margin below absolute maximum ratings of downstream ICs. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input, shunting transients before they reach precision front-end circuitry. Use Value: Maintains signal fidelity under ±200 V/50 ms load dump events by limiting voltage excursion to ≤42.1 V, preserving ADC accuracy and preventing latch-up. |
Use Scenario: Safeguarding CANH/CANL differential pair in factory automation gateways subjected to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Paired SMBJ26CAHM3_B/I devices (one per line) referenced to common ground, clamping common-mode transients on both bus wires simultaneously. Use Value: Prevents CAN transceiver damage during 4 kV EFT (IEC 61000-4-4) by holding differential swing within spec and avoiding bus dominant-state corruption. |
| Consumer USB Port ESD Protection | Telecom Power Supply Input Clamp |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines behind primary polymer TVS, absorbing residual 8 kV HBM discharges. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp placed directly at connector, diverting ESD current away from USB PHY transceivers. Use Value: Achieves <1 ns response time and sub-1 µA leakage, ensuring no signal attenuation or jitter on 480 Mbps data lines while passing IEC 61000-4-2 Level 4. |
Use Scenario: Input-stage surge suppression on 24 V DC telecom power supplies vulnerable to induced surges from nearby AC mains switching. IC Role / Device Role / Timing Role: Parallel-connected TVS across input rails, activated only during >26 V transients to avoid crowbar action during normal regulation. Use Value: Limits input rail overshoot to 42.1 V during 600 W surges, preventing overvoltage shutdown or damage to upstream DC/DC controllers and bulk capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CAHE3_B/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free; lacks AEC-Q101 qualification. | Approved for non-automotive industrial/commercial use only; unsuitable for automotive Tier-1 BOMs requiring HM3 traceability. | Select SMBJ26CAHE3_B/I only if halogen-free content and AEC-Q101 are not mandated - lower cost alternative for consumer-grade designs. |
| SMAJ26CAHM3_A/I | Lower 400 W PPPM, higher VC = 45.7 V at 10.3 A, SMA (DO-214AC) package - smaller footprint but reduced surge handling. | Used where board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 2 (1 kA); not suitable for full Level 4 compliance. | Choose SMAJ26CAHM3_A/I only when PCB area is critical and peak surge energy is confirmed ≤400 W - verify thermal derating with RθJA = 140 °C/W. |
Compared with SMBJ26CAHE3_B/I, the SMBJ26CAHM3_B/I adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ26CAHM3_A/I, it delivers 50% higher surge power handling and tighter VC in a slightly larger SMB package - essential for automotive and industrial surge-critical nodes.
Availability
SMBJ26CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB port protection, and telecom power supply input clamping requiring stable component supply with full halogen-free and AEC-Q101 compliance.
Supply support for SMBJ26CAHM3_B/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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping, low leakage, and AEC-Q101 validation are mandatory design requirements.
FAQ
What is the clamping voltage of SMBJ26CAHM3_B/I at its rated peak pulse current?
The SMBJ26CAHM3_B/I has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 14.3 A, measured under the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per Vishay's datasheet (Document Number: 88392, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuits during worst-case transient events. The SMBJ26CAHM3_B/I maintains this clamping performance bidirectionally due to its symmetrical junction structure.
Is SMBJ26CAHM3_B/I suitable for automotive applications?
Yes, SMBJ26CAHM3_B/I is AEC-Q101 qualified (denoted by the HM3 suffix), making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. It operates across the full automotive temperature range (–55 °C to +150 °C), passes accelerated lifetime testing per AEC-Q101, and carries halogen-free, RoHS-compliant materials documentation required by Tier-1 suppliers. The SMBJ26CAHM3_B/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix for transient suppression.
How does the bidirectional design of SMBJ26CAHM3_B/I affect its circuit implementation?
The SMBJ26CAHM3_B/I has no polarity marking and functions identically in both directions - its anode and cathode terminals are interchangeable in layout. This eliminates orientation errors during automated placement and simplifies protection of AC-coupled or differential lines (e.g., CAN, RS-485). Unlike unidirectional TVS diodes, the SMBJ26CAHM3_B/I clamps positive and negative transients relative to circuit ground without requiring external biasing or dual-device configurations.
What is the maximum reverse leakage current for SMBJ26CAHM3_B/I at its standoff voltage?
The SMBJ26CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 26 V standoff voltage (VWM), measured at 25 °C ambient. This ultra-low leakage preserves signal integrity in high-impedance sensor outputs and battery-powered nodes, and avoids measurable power loss in always-on monitoring circuits. The value is specified in the "ELECTRICAL CHARACTERISTICS" table of Vishay's SMBJ5.0A–SMBJ188A datasheet (Rev. 09-Jan-2024) and applies to both directions due to its bidirectional construction.
Does SMBJ26CAHM3_B/I require special PCB layout considerations for optimal surge performance?
Yes - to achieve the rated 600 W peak pulse power and 42.1 V clamping, the SMBJ26CAHM3_B/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in Vishay's thermal characterization. Smaller pads increase thermal resistance, causing higher junction temperatures and potential VC drift or premature failure under repetitive surges. The SMBJ26CAHM3_B/I also benefits from short, wide traces to minimize inductance and ensure fast transient response.
SMBJ26CAHM3_B/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:
- Active
- 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):
- 14.3A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ26CAHM3_B/I FAQ
1.How can I place an order for SMBJ26CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/I reliable?
The price and inventory of SMBJ26CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ26CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CAHM3_B/I?
SMBJ26CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/I?
For technical support, including SMBJ26CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ26CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ26CAHM3_B/I?
All SMBJ26CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ26CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26CAHM3_B/I Tags
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