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Vishay General Semiconductor - Diodes Division SMBJ26A-E3/51
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- Part No.:
- SMBJ26A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26A-E3/51.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,655
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Product details
Overview
SMBJ26A-E3/51 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 26 V stand-off voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1.0 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.
For engineers reviewing the SMBJ26A-E3/51 datasheet, SMBJ26A-E3/51 pinout, SMBJ26A-E3/51 application, or SMBJ26A-E3/51 equivalent, key selection considerations include its unidirectional polarity, RoHS-compliant matte tin-plated leads, MSL Level 1 moisture sensitivity, and suitability for automotive-grade designs when ordered with HE3 suffix.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 26 V and rapidly transitions to low-impedance conduction above VBR (min 28.9 V), limiting transient voltages to ≤42.1 V at 14.3 A. Its glass-passivated junction ensures stable avalanche performance and fast response time (<1 ns).
The SMBJ26A-E3/51 is rated for repetitive surge duty cycle of 0.01 %, with thermal resistance RθJA = 100 °C/W and maximum junction temperature of +150 °C. It meets UL 497B recognition (QVGQ2) and is qualified to AEC-Q101 when ordered with HE3/HM3 suffixes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - Maximum continuous reverse operating voltage before significant leakage; defines circuit's normal operating margin. |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1.0 mA - Confirmed avalanche initiation range; ensures reliable triggering above system rail. |
| VC (Clamping Voltage) | 42.1 V at IPPM = 14.3 A - Peak voltage seen by protected IC during 10/1000 µs surge; determines safe stress level. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability under standardized 10/1000 µs transient; validates robustness vs. IEC 61000-4-5. |
| IPPM (Peak Pulse Current) | 14.3 A - Maximum non-repetitive surge current the device can clamp without failure; derived from VC and PPPM. |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial ambient environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.205" × 0.130" footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during positive transients on cathode side. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V supply rail); conducts avalanche current to anode when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates protection against severe transients per IEC 61000-4-5 Level 4 (4 kV surge) on 24 V systems. |
| 42.1 V clamping at 14.3 A | Ensures downstream 3.3 V/5 V logic or MOSFET gate drivers remain within absolute maximum ratings during clamping. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow assembly without pre-baking; reduces manufacturing complexity and cost. |
| Glass passivated junction | Delivers stable VBR tolerance and low leakage (<1.0 µA at VWM) over temperature and lifetime. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements; suitable for consumer, industrial, and telecom equipment. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
|
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: Unidirectional TVS placed between input terminal and ground to clamp positive transients while blocking reverse leakage. Use Value: Limits voltage to ≤42.1 V during 1 kV/500 A surge events, preserving optocoupler input integrity and preventing false triggering. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs in body control modules exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail and signal lines to absorb coupled transients without affecting normal 12 V operation. Use Value: Maintains VWM = 26 V margin above nominal 12 V rail, enabling robust clamping during ISO 7637-2 Pulse 1/2/5a events. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
|
Use Scenario: Secondary-side overvoltage suppression on 24 V DC-DC converter outputs feeding baseband processors in telecom infrastructure. IC Role / Device Role / Timing Role: Fast-response clamping diode placed across output capacitor to prevent overshoot during dynamic load steps or fault recovery. Use Value: Sub-1 ns response ensures clamping initiates before processor reset thresholds are exceeded during 100 ns–1 µs transients. |
Use Scenario: Protecting H-bridge gate drivers and MCU pins from back-EMF spikes generated by brushed DC motors in smart appliances. IC Role / Device Role / Timing Role: Unidirectional TVS on motor supply rail and half-bridge source nodes to shunt inductive energy to ground. Use Value: 600 W rating handles repeated 100 ms motor stall surges; low incremental resistance minimizes VC rise during high-current events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA-E3/51 | Bidirectional; symmetric VBR = 28.9–31.9 V; same VC, PPPM, and package. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN); not suitable for DC rails with defined polarity. | Select SMBJ26CA-E3/51 only when protecting bidirectional signals or floating references where polarity reversal may occur. |
| SMAJ26A-E3/52 | Lower PPPM = 400 W; same VWM/VBR; SMA (DO-214AC) package with smaller footprint (0.165" × 0.130"). | Acceptable for lower-energy transients (e.g., IEC 61000-4-2 ESD only); insufficient for IEC 61000-4-5 Level 3+ surges. | Choose SMAJ26A-E3/52 only if board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
Compared with SMBJ26CA-E3/51 and SMAJ26A-E3/52, the SMBJ26A-E3/51 provides optimal balance of 600 W surge capacity, unidirectional polarity assurance, and SMB package manufacturability-making it the preferred choice for 24 V DC power rail and single-ended signal protection in industrial and automotive systems.
Availability
SMBJ26A-E3/51 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom power supplies, and consumer appliance motor drives requiring stable component supply and consistent surge immunity performance.
Supply support for SMBJ26A-E3/51 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, TVS devices, and power MOSFETs with emphasis on reliability and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial automation, and telecom infrastructure where robustness, consistency, and AEC-Q101 qualification matter.
FAQ
What is the maximum clamping voltage of SMBJ26A-E3/51 under standard test conditions?
The SMBJ26A-E3/51 has a maximum clamping voltage (VC) of 42.1 V at a peak pulse current (IPPM) of 14.3 A, measured using the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ26A-E3/51 maintains this clamping performance across its specified operating temperature range.
Is SMBJ26A-E3/51 suitable for automotive applications?
SMBJ26A-E3/51 is RoHS-compliant and rated for operation from –55 °C to +150 °C, but it is not AEC-Q101 qualified in the E3/51 configuration. For automotive use, Vishay specifies the SMBJ26AHE3 variant (with HE3 suffix), which undergoes full AEC-Q101 stress testing. The SMBJ26A-E3/51 remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, but design validation per ISO 7637-2 is still required. Always verify qualification status via the full ordering code.
How does the SMBJ26A-E3/51 differ from bidirectional TVS diodes like SMBJ26CA-E3/51?
The SMBJ26A-E3/51 is unidirectional and functions only during positive voltage transients on its cathode relative to anode; it blocks reverse current like a standard diode. In contrast, SMBJ26CA-E3/51 is bidirectional and clamps transients of either polarity symmetrically. This makes SMBJ26A-E3/51 ideal for DC power rails (e.g., 24 V supply), while SMBJ26CA-E3/51 suits AC lines or differential buses like RS-485. Their VBR, VC, and PPPM are identical, but polarity behavior is fundamentally different.
What is the thermal resistance and power derating behavior of SMBJ26A-E3/51?
The SMBJ26A-E3/51 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. Its 5.0 W steady-state power dissipation (PD) is derated linearly above 25 °C ambient, reaching zero at +75 °C. Peak pulse power (600 W) is also derated above 25 °C per Vishay's Fig. 2 curve-e.g., at 85 °C initial junction temperature, usable PPPM drops to ~420 W. These values directly impact layout decisions and long-term reliability in thermally constrained designs.
Can SMBJ26A-E3/51 be used in place of SMAJ26A-E3/52?
SMBJ26A-E3/51 and SMAJ26A-E3/52 share identical electrical parameters (VWM, VBR, VC) but differ in package and surge rating: SMBJ uses the larger SMB (DO-214AA) outline and delivers 600 W peak pulse power, whereas SMAJ uses the smaller SMA (DO-214AC) and is rated for 400 W. Substituting SMBJ26A-E3/51 for SMAJ26A-E3/52 is mechanically feasible with pad adaptation and provides higher surge margin-but replacing SMBJ26A-E3/51 with SMAJ26A-E3/52 risks failure under IEC 61000-4-5 Level 4 stress. The SMBJ26A-E3/51 is not a drop-in replacement due to footprint mismatch.
SMBJ26A-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-E3/51 FAQ
1.How can I place an order for SMBJ26A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26A-E3/51 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-E3/51 reliable?
The price and inventory of SMBJ26A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26A-E3/51 is usually 5 days.
3.What payment methods are accepted for SMBJ26A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26A-E3/51?
SMBJ26A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26A-E3/51 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-E3/51?
For technical support, including SMBJ26A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26A-E3/51 requirements.
6.How does Aetrix verify that SMBJ26A-E3/51 is sourced from the original manufacturer or authorized distributors?
All SMBJ26A-E3/51 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-E3/51 meets industry standards.
7.What is the process for return or replacement of SMBJ26A-E3/51?
All SMBJ26A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26A-E3/51, 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-E3/51 part is unused and in its original packaging.
Return procedure for SMBJ26A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26A-E3/51 Tags
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