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Vishay General Semiconductor - Diodes Division SMBJ26A-E3/5B
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- Part No.:
- SMBJ26A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26A-E3/5B.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,163
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Product details
Overview
SMBJ26A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 26 V stand-off 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 10/1000 µs waveform - deployed on power rails and signal lines of industrial motor drives.
For engineers reviewing the SMBJ26A-E3/5B datasheet, SMBJ26A-E3/5B pinout, SMBJ26A-E3/5B application, or SMBJ26A-E3/5B equivalent, key selection criteria include clamping performance under 14.3 A surge, thermal resistance (RθJA = 100 °C/W), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, responding to transient overvoltages above its VWM threshold by entering low-impedance conduction mode within <1 ps. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 26 V), while the SMB package supports high surge current handling without thermal runaway under repetitive 0.01% duty cycle conditions.
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 exhibits a positive temperature coefficient of VBR (+0.097 %/°C), enabling predictable voltage margin shift across temperature extremes in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal DC systems. |
| VBR (min/max) | 28.9 V / 31.9 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 42.1 V at 14.3 A - Clamping voltage limits downstream IC stress during 600 W transients; critical for protecting 3.3 V/5 V logic interfaces. |
| PPPM | 600 W - Peak pulse power capability with 10/1000 µs waveform; validates protection against lightning-induced surges and inductive switching spikes. |
| IPPM | 14.3 A - Peak pulse current derived from PPPM/VC; determines minimum trace width and PCB pad design for energy dissipation. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires ≥5.0 mm × 5.0 mm copper pads per terminal to sustain 5.0 W steady-state power at TA = 50 °C. |
| Leakage ID | <1.0 µA at 26 V - Ultra-low reverse leakage preserves battery life and signal integrity in always-on sensor nodes and low-power IoT devices. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to system ground or lower-potential rail; enables unidirectional clamping from protected line to GND. |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 24 V supply or RS-485 bus); carries full surge current during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V industrial buses without external series impedance. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving clamping precision for high-speed digital interfaces. |
| MSL Level 1 moisture sensitivity | Allows direct placement from reel without baking; eliminates production delays and moisture-related popcorning during reflow. |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets global environmental regulations; matte tin terminations ensure consistent wetting and void-free solder joints in lead-free assembly. |
| 150 °C max junction temperature | Supports operation in enclosed enclosures or high-ambient environments (e.g., factory automation cabinets) without derating below 25 °C ambient. |
Applications
| Industrial Motor Drive Power Supply | Automotive Body Control Module (BCM) Inputs |
|---|---|
|
Use Scenario: Protection of 24 V DC input stage against load dump and inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground, conducting only during overvoltage events. Use Value: Limits transient voltage to ≤42.1 V, preventing damage to upstream DC/DC converters and microcontroller power supervisors. |
Use Scenario: Shielding LIN bus or switch inputs in BCMs from ESD and battery reversal transients during service. IC Role / Device Role / Timing Role: Standoff-rated protector on low-voltage (12 V nominal) signal paths, activated only above 26 V. Use Value: Maintains <1.0 µA leakage at 12 V, avoiding false wake-up or battery drain while clamping 14.3 A surges to safe levels. |
| Telecom Remote Radio Unit (RRU) DC Feeds | Consumer Appliance Mainboard 24 V Rail |
|
Use Scenario: Safeguarding PoE-powered remote radio units fed via long outdoor cables susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on 24 V DC feed line, coordinated with upstream gas discharge tube (GDT) for staged protection. Use Value: 600 W rating handles partial energy from multi-kV surges after GDT triggering, reducing thermal stress on downstream components. |
Use Scenario: Protecting smart appliance mainboards (e.g., washing machine control boards) from relay contact arcing and transformer flyback. IC Role / Device Role / Timing Role: Low-profile surface-mount suppressor mounted directly at connector entry point on 24 V auxiliary rail. Use Value: SMB footprint enables compact layout; 100 °C/W RθJA allows thermal management using standard FR-4 with minimal copper area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA-E3/5B | Bidirectional variant; symmetric VBR (28.9–31.9 V) in both polarities; no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where reverse polarity transients occur. | Select SMBJ26CA-E3/5B only when bidirectional clamping is mandated; unidirectional SMBJ26A-E3/5B offers lower leakage in DC-biased rails. |
| SMAJ26A-E3/52 | Same VWM/VC specs but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable for space-constrained consumer designs with lower surge exposure (e.g., USB-C PD adapters). | Choose SMAJ26A-E3/52 only if board area is critical and surge threat level is ≤400 W; SMBJ26A-E3/5B delivers 50% higher power headroom. |
Compared with SMBJ26CA-E3/5B and SMAJ26A-E3/52, SMBJ26A-E3/5B uniquely balances 600 W surge capacity, industry-standard SMB footprint, and ultra-low leakage for 24 V DC systems - making it optimal for industrial and automotive power rail protection where unidirectional threats dominate.
Availability
SMBJ26A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom remote radio units, and consumer appliance mainboards requiring stable component supply and long-term manufacturing continuity.
Supply support for SMBJ26A-E3/5B 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, and protection devices with emphasis on reliability, power efficiency, and AEC-Q101 qualification.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where failure resilience and thermal stability are non-negotiable.
FAQ
What is the maximum clamping voltage of SMBJ26A-E3/5B at its rated peak pulse current?
The SMBJ26A-E3/5B has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 14.3 A, measured with a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is critical for ensuring downstream components like DC/DC controllers or microcontrollers remain within absolute maximum ratings. The SMBJ26A-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ26A-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No - SMBJ26A-E3/5B is the commercial-grade RoHS-compliant version (E3 suffix). For AEC-Q101 qualified use in automotive applications, the correct part is SMBJ26AHE3_B/I (halogen-free, AEC-Q101 qualified, 13" reel). The SMBJ26A-E3/5B lacks the extended temperature cycling, humidity testing, and failure analysis required for automotive qualification, though it remains widely used in industrial and telecom equipment where AEC-Q101 is not mandated.
How does the SMBJ26A-E3/5B differ from the SMBJ26CA-E3/5B in terms of electrical behavior?
The SMBJ26A-E3/5B is unidirectional and conducts only when the cathode is positive relative to the anode - ideal for DC rail protection. In contrast, SMBJ26CA-E3/5B is bidirectional, with identical breakdown and clamping characteristics in both directions, suited for AC signals or floating buses like RS-485. Both share identical VWM (26 V), VBR, and VC values, but SMBJ26A-E3/5B exhibits <1.0 µA leakage at 26 V, whereas SMBJ26CA-E3/5B may show higher leakage in one polarity due to symmetrical junction design.
What PCB layout guidance applies to SMBJ26A-E3/5B for optimal thermal and surge performance?
For optimal thermal dissipation and surge current handling, the SMBJ26A-E3/5B must be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, as specified in the Vishay datasheet. Traces connecting to the device should be wide and short to minimize inductance - especially on the cathode side carrying full surge current. Avoid thermal reliefs on pads; use solid copper pours tied to internal ground planes. The SMBJ26A-E3/5B's RθJA of 100 °C/W assumes this layout, and deviation risks exceeding 150 °C junction temperature during repetitive surges.
Can SMBJ26A-E3/5B be used in place of SMAJ26A-E3/52 without board modifications?
No - although both are unidirectional 26 V TVS diodes, SMBJ26A-E3/5B uses the larger SMB (DO-214AA) package (5.21 mm × 4.06 mm), while SMAJ26A-E3/52 uses the smaller SMA (DO-214AC) package (4.57 mm × 2.69 mm). Their footprints are incompatible; replacing one with the other requires PCB redesign. Additionally, SMBJ26A-E3/5B delivers 600 W peak power versus 400 W for SMAJ26A-E3/52, offering greater surge margin where board space permits.
SMBJ26A-E3/5B 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-E3/5B FAQ
1.How can I place an order for SMBJ26A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26A-E3/5B 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-E3/5B reliable?
The price and inventory of SMBJ26A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ26A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26A-E3/5B?
SMBJ26A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26A-E3/5B 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-E3/5B?
For technical support, including SMBJ26A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26A-E3/5B requirements.
6.How does Aetrix verify that SMBJ26A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ26A-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ26A-E3/5B?
All SMBJ26A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26A-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ26A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26A-E3/5B Tags
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