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Vishay General Semiconductor - Diodes Division SMBJ26CD-M3/I
- Part No.:
- SMBJ26CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CD-M3/I.pdf
- Description:
- TVS DIODE 26VWM 41.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,630
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Product details
Overview
SMBJ26CD-M3/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 a 26 V stand-off voltage (VWM), 29.3–31.5 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps to ≤41.6 V at 14.5 A peak surge current - used for protecting I/O ports and sensor interfaces in industrial control systems.
For engineers reviewing the SMBJ26CD-M3/I datasheet, SMBJ26CD-M3/I pinout, SMBJ26CD-M3/I application, or SMBJ26CD-M3/I equivalent, key selection criteria include bidirectional clamping capability, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), M3-grade halogen-free RoHS compliance, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protection element in both polarities, leveraging avalanche breakdown to shunt transient energy away from downstream circuitry. Its bidirectional symmetry eliminates polarity concerns during layout, and its 10/1000 μs waveform rating aligns with IEC 61000-4-5 surge immunity testing requirements.
The SMBJ26CD-M3/I exhibits low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes. Thermal resistance (RθJA = 125 °C/W on minimum pad) and junction temperature limit (TJ = 150 °C) define its derating behavior under repetitive surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR @ IT = 1 mA | 29.3–31.5 V - tight ±3.5 % tolerance ensures predictable turn-on across production lots and temperature range. |
| VC @ IPPM = 14.5 A | ≤41.6 V - clamping voltage limits stress on protected ICs; critical for safeguarding 3.3 V or 5 V logic interfacing with 24 V field wiring. |
| IPPM (10/1000 μs) | 14.5 A - peak surge current capacity determines survivability against defined surge waveforms per IEC 61000-4-5 Level 3. |
| ID @ VWM | ≤0.5 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss in battery-powered sensors. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 2.2 mm height and 5.59 mm length; compatible with J-STD-020 MSL level 1 reflow. |
| Power dissipation | 1.0 W at TA = 25 °C - sets thermal design boundary for ambient-convection cooling without heatsinking. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no cathode band marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path (bidirectional) | Either terminal serves as input/output; no polarity sensitivity - simplifies PCB routing and eliminates orientation errors during assembly. |
| Case (cathode side in unidirectional variants) | Thermal and mechanical interface | Exposed copper pad area transfers heat to PCB; requires minimum 5.0 mm × 5.0 mm copper for rated power handling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, encoder outputs) without external polarity management. |
| ±3.5 % VBR tolerance | Reduces overdesign margin needed for worst-case clamping; supports tighter system-level voltage margining in 24 V industrial buses. |
| 600 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge immunity up to 1 kV line-to-ground (2 Ω source impedance) without derating for typical PCB layouts. |
| M3 suffix compliance | Halogen-free, RoHS-compliant, and JESD 201 Class 2 whisker-resistant - qualified for long-life industrial and automotive-adjacent applications. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture sensitivity handling overhead in high-volume SMT lines. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) Sensor Inputs |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from inductive kickback and field-wiring surges. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between input terminal and ground, absorbing >1 kV transients before they reach optocoupler or MCU GPIO. Use Value: Prevents latch-up or permanent damage to isolation components; maintains functional safety integrity under repeated surge exposure per IEC 61000-4-4/5. |
Use Scenario: Safeguarding analog sensor inputs (e.g., temperature, pressure) connected to BCM microcontrollers in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Bidirectional transient suppressor on differential or single-ended sensor lines exposed to load-dump or jump-start events. Use Value: Clamps transients to <42 V while maintaining sub-μA leakage - avoids signal offset drift and preserves ADC accuracy in millivolt-range measurements. |
| RS-485 Transceiver Port Protection | Smart Meter Communication Interface |
Use Scenario: Shielding half-duplex RS-485 bus lines (A/B) in building automation gateways from ESD and cable-induced surges. IC Role / Device Role / Timing Role: Paired SMBJ26CD-M3/I devices (one per line) referenced to ground, providing symmetrical clamping independent of data polarity. Use Value: Enables robust 250 kbps+ communication over 1200 m cable runs in electrically noisy environments without added common-mode chokes. |
Use Scenario: Securing HAN (Home Area Network) interfaces like PLC or RF modules in electricity meters subjected to grid-side surges and meter-reader ESD events. IC Role / Device Role / Timing Role: Primary surge suppression stage before secondary filtering and TVS arrays, handling bulk energy per IEC 61000-4-5 Ed. 3. Use Value: Extends product lifetime beyond 15 years in utility deployments by surviving >100,000 surge events with no parameter shift or leakage degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ26CA | Same VWM/VBR range and 600 W rating, but SMA package (DO-214AC); RθJA = 140 °C/W vs. 125 °C/W for SMBJ26CD-M3/I. | SMA footprint requires larger pad area; less suitable for dense industrial PCBs where SMB saves board space. | Select SMAJ26CA only if existing design uses SMA or requires legacy footprint compatibility. |
| ON Semiconductor SMCJ26CA | Higher 1500 W rating (SMC package), wider VBR tolerance (±5 %), and higher IPPM (32.9 A), but larger footprint and 2× cost. | Over-specified for 24 V I/O protection; better suited for primary AC-line or DC-input stages requiring higher surge margin. | Choose SMCJ26CA when system-level surge testing exceeds IEC 61000-4-5 Level 4 or when dual-stage protection architecture is used. |
Compared with SMAJ26CA and SMCJ26CA, the SMBJ26CD-M3/I delivers optimal balance of surge robustness, compact SMB footprint, tight VBR tolerance, and industrial-grade reliability - making it the preferred choice for space-constrained 24 V signal line protection where thermal and layout efficiency are critical.
Availability
SMBJ26CD-M3/I is available at Aetrix Electronics and suitable for industrial automation, smart metering, and automotive body electronics requiring stable component supply, long-term lifecycle support, and M3-grade environmental compliance.
Supply support for SMBJ26CD-M3/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, precision, and application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in harsh industrial and transportation environments, targeting robustness against repetitive surges, wide temperature operation, and seamless SMT integration.
FAQ
What is the clamping voltage of SMBJ26CD-M3/I at its rated peak pulse current?
The SMBJ26CD-M3/I clamps to a maximum of 41.6 V at its rated peak pulse current of 14.5 A (10/1000 μs waveform). This value is guaranteed per Vishay's datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces downstream of 24 V field connections. The SMBJ26CD-M3/I achieves this with low dynamic impedance and consistent performance across temperature.
Is SMBJ26CD-M3/I suitable for bidirectional signal lines such as RS-485 or CAN?
Yes, SMBJ26CD-M3/I is explicitly designed for bidirectional applications, as indicated by the "CD" suffix and confirmed in Vishay's documentation. Its symmetrical breakdown characteristics allow it to protect AC-coupled or floating differential lines without polarity constraints. The SMBJ26CD-M3/I has been validated in RS-485 transceiver protection circuits where it clamps transients on both A and B lines independently while maintaining signal integrity up to 250 kbps.
Does SMBJ26CD-M3/I require a heatsink for standard operation?
No, SMBJ26CD-M3/I does not require an external heatsink under normal steady-state conditions. Its 1.0 W power dissipation rating at 25 °C ambient assumes operation on standard PCB copper pads (minimum recommended layout). For surge events, thermal mass of the PCB acts as the primary heat sink; the SMBJ26CD-M3/I's RθJA of 125 °C/W is specified for that configuration - sufficient for intermittent transients per IEC 61000-4-5 duty cycle (0.01 %).
How does the M3 suffix affect the reliability of SMBJ26CD-M3/I?
The M3 suffix on SMBJ26CD-M3/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 Class 2 for whisker resistance. This enhances long-term reliability in high-humidity or high-temperature industrial environments and ensures compatibility with lead-free reflow processes. The SMBJ26CD-M3/I meets UL 94 V-0 flammability and MSL Level 1 (260 °C peak), making it suitable for automotive-adjacent and infrastructure applications demanding extended service life.
Can SMBJ26CD-M3/I replace SMBJ26A-M3/I in an existing design?
No - SMBJ26CD-M3/I is bidirectional, while SMBJ26A-M3/I is unidirectional. Swapping them without circuit review risks improper clamping during negative transients or reverse-bias leakage issues. The SMBJ26CD-M3/I lacks a cathode band and functions identically in both directions, whereas SMBJ26A-M3/I requires correct polarity orientation. Always verify signal topology and transient directionality before substitution; the SMBJ26CD-M3/I is only a direct replacement if the original design intentionally used bidirectional protection.
SMBJ26CD-M3/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):
- 29.3V
- Voltage - Clamping (Max) @ Ipp:
- 41.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ26CD-M3/I FAQ
1.How can I place an order for SMBJ26CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CD-M3/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 SMBJ26CD-M3/I reliable?
The price and inventory of SMBJ26CD-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ26CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CD-M3/I?
SMBJ26CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CD-M3/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 SMBJ26CD-M3/I?
For technical support, including SMBJ26CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CD-M3/I requirements.
6.How does Aetrix verify that SMBJ26CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ26CD-M3/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 SMBJ26CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ26CD-M3/I?
All SMBJ26CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CD-M3/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 SMBJ26CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ26CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26CD-M3/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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