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Vishay General Semiconductor - Diodes Division SMBJ26A-M3/5B
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- Part No.:
- SMBJ26A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26A-M3/5B.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,345
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Product details
Overview
SMBJ26A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection of sensitive electronics. It features a 26 V standoff voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, 42.1 V maximum clamping voltage (VC) at 14.3 A peak pulse current, and 600 W peak pulse power rating with a 10/1000 µs waveform-used to safeguard MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ26A-M3/5B datasheet, SMBJ26A-M3/5B pinout, SMBJ26A-M3/5B application, or SMBJ26A-M3/5B equivalent, key selection criteria include clamping performance under 14.3 A surge, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), SMB (DO-214AA) package compatibility, and unidirectional polarity with cathode band marking.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 26 V), while the low incremental surge resistance supports rapid energy dissipation during 10/1000 µs transients.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 only in HE3/HM3 variants-not the M3/5B commercial-grade version shown here.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 42.1 V at 14.3 A - Clamped voltage during 600 W transient, limiting stress on protected ICs |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform, duty cycle ≤ 0.01 % |
| IPPM | 14.3 A - Peak pulse current corresponding to VC and PPPM, used for PCB trace sizing |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm copper pads |
| TJ max. | +150 °C - Maximum junction temperature defining derating limits above 25 °C ambient |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by a single band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., I/O, power rail); band-marked end defines polarity |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems |
| 42.1 V clamping at 14.3 A | Limits voltage overshoot to safe levels for 3.3 V/5 V/24 V logic and interface ICs |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance requirements for commercial industrial products without brominated flame retardants |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking-reduces manufacturing overhead |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from inductive kickback and ESD events. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between input line and ground, clamping transients within 1 ns response time. Use Value: Prevents latch-up or permanent damage to microcontroller GPIOs and level translators by limiting voltage to ≤42.1 V during 14.3 A surges. | Use Scenario: Safeguarding 24 V supply rail feeding microcontrollers and CAN transceivers in non-safety-critical automotive modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power entry point, coordinated with upstream fuses and secondary LC filtering. Use Value: Absorbs load-dump spikes up to 600 W without degradation, maintaining system uptime and reducing field failure rates. |
| Telecom Base Station Sensor Interface | Consumer Appliance Motor Drive Feedback Line |
Use Scenario: Shielding analog sensor signal lines (e.g., temperature, humidity) connected to remote radio units from lightning-induced surges. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed directly at connector entry, minimizing stub length to preserve signal integrity. Use Value: Clamps transients to 42.1 V while adding <10 pF capacitance, avoiding distortion of sub-MHz analog signals. | Use Scenario: Protecting hall-effect sensor outputs in washing machine motor control boards exposed to commutation noise. IC Role / Device Role / Timing Role: Point-of-use TVS on low-voltage feedback traces (5 V or 3.3 V), mounted adjacent to sensor IC package. Use Value: Suppresses fast-rising edge noise (dv/dt > 100 V/ns) before it couples into ADC inputs, improving measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Acceptable where halogen-free requirement is not mandated (e.g., non-EU commercial gear) | Select E3/5B for cost-sensitive designs without halogen restrictions |
| SMCJ26A-M3 | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VC | Used where higher surge margin is required (e.g., outdoor telecom enclosures) | Choose SMCJ26A-M3 when 600 W is insufficient and board space allows larger footprint |
Compared with SMBJ26A-M3/5B, the E3/5B variant offers identical protection performance with standard RoHS compliance but lacks halogen-free certification, while the SMCJ26A-M3 delivers 2.5× higher surge capacity in a physically larger package-requiring layout revision but enabling extended service life in harsh environments.
Availability
SMBJ26A-M3/5B is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and consumer appliance designs requiring stable component supply, halogen-free compliance, and proven 600 W transient immunity.
Supply support for SMBJ26A-M3/5B 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-reliability transient suppression in space-constrained surface-mount applications, targeting industrial, telecom, and automotive subsystems where consistent clamping and long-term stability under surge stress are critical.
FAQ
What is the maximum clamping voltage of SMBJ26A-M3/5B under a 10/1000 µs surge?
The SMBJ26A-M3/5B has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current of 14.3 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ26A-M3/5B maintains this clamping performance across its specified operating temperature range.
Does SMBJ26A-M3/5B meet AEC-Q101 qualification for automotive use?
No, SMBJ26A-M3/5B is a commercial-grade halogen-free part (M3 suffix) and is not AEC-Q101 qualified. Vishay offers AEC-Q101 versions under the HM3 suffix (e.g., SMBJ26AHM3_B/I), which include additional stress testing and traceability. For automotive applications requiring qualification, the SMBJ26A-M3/5B must be replaced with an HM3 or HE3 variant-SMBJ26A-M3/5B itself is intended for industrial and telecom equipment.
What does the "/5B" in SMBJ26A-M3/5B indicate?
The "/5B" denotes the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3200 pieces per reel. This format supports high-volume automated SMT placement. The "M3" prefix confirms halogen-free, RoHS-compliant construction, while "SMBJ26A" specifies the 26 V standoff voltage, unidirectional polarity, and SMB package. No functional or electrical differences exist between /5B and other reel codes like /52.
How is the polarity marked on SMBJ26A-M3/5B?
The SMBJ26A-M3/5B uses a cathode band marking on the body to indicate polarity: the banded end is the cathode terminal, and the opposite end is the anode. This unidirectional configuration requires correct orientation during PCB layout-cathode connects to the line being protected, anode to ground. Bidirectional variants (e.g., SMBJ26CA) omit the band and conduct identically in both directions.
What is the thermal resistance of SMBJ26A-M3/5B, and how does it affect layout?
The SMBJ26A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding internal ground planes lowers RθJA and improves surge endurance. Layouts must ensure adequate copper pour to avoid exceeding +150 °C junction temperature during repetitive transients.
SMBJ26A-M3/5B 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:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ26A-M3/5B FAQ
1.How can I place an order for SMBJ26A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26A-M3/5B 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 SMBJ26A-M3/5B reliable?
The price and inventory of SMBJ26A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ26A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26A-M3/5B?
SMBJ26A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26A-M3/5B 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 SMBJ26A-M3/5B?
For technical support, including SMBJ26A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26A-M3/5B requirements.
6.How does Aetrix verify that SMBJ26A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ26A-M3/5B 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 SMBJ26A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ26A-M3/5B?
All SMBJ26A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26A-M3/5B, 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 SMBJ26A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ26A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26A-M3/5B Tags
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