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Taiwan Semiconductor Corporation SMBJ26
- Part No.:
- SMBJ26
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26.pdf
- Description:
- 600W, 32.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
SMBJ26 from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 26V working stand-off voltage (VWM), 28.9–35.3V breakdown voltage (VBR), and 46.6V maximum clamping voltage (VC) at 13.5A peak impulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.
For engineers reviewing the SMBJ26 datasheet, SMBJ26 pinout, SMBJ26 application, or SMBJ26 equivalent, key selection criteria include clamping performance under 10/1000µs transients, junction temperature derating above 25°C, unidirectional polarity marking, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.
Technical Context
The SMBJ26 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (28.9–35.3V at 1mA test current). It clamps transient energy by shunting surge current to ground while limiting voltage across protected circuitry to ≤46.6V at 13.5A IPP.
Its glass-passivated junction ensures stable leakage (<1µA at 26V), fast response (<1.0ps), and thermal reliability up to TJ = 150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in its DO-214AA molded package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 28.9V / 35.3V at 1mA - guaranteed avalanche onset range for design margining |
| VC @ IPP | 46.6V at 13.5A - peak clamped voltage during 10/1000µs surge, defining protection window |
| PPK | 600W - non-repetitive peak pulse power handling per ISO 7637-2 compliant waveform |
| ID @ VWM | <1µA - negligible leakage current at rated stand-off, minimizing standby power loss |
| TJ max | +150°C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 55°C/W - thermal resistance from junction to ambient, critical for PCB copper area planning |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking on one end; matte tin-plated leads, RoHS- and halogen-free compliant; weight ≈0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-side reference | Connected to ground or low-impedance return path during clamping |
| Cathode | Protected line input / high-side connection | Connected to the line being protected (e.g., 24V rail); marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| Fast response time <1.0ps | Enables suppression of ESD and EFT events before sensitive ICs experience overstress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power-line immunity without external filtering augmentation |
| J-STD-020 moisture sensitivity level 1 | Allows unlimited floor life and standard reflow without baking preconditioning |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for industrial and transportation enclosures |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 24V battery-fed control module exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤46.6V, preserving downstream 36V-rated input stages and avoiding brownout resets. | Use Scenario: Digital input channel of a programmable logic controller receiving 24V sensor signals in factory-floor environments. IC Role / Device Role / Timing Role: Standoff protection element on field-side signal line, absorbing inductive kickback from solenoid drivers and EFT bursts. Use Value: Prevents latch-up or gate oxide damage in optocoupler input stages with <1µA leakage at 26V operating point. |
| LED Driver Overvoltage Clamp | Telecom Power Interface |
Use Scenario: Constant-current LED driver board powered from 28V telecom supply, subject to hot-swap transients and cable discharge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input capacitor node, activated within picoseconds to limit bus overshoot. Use Value: Maintains safe operating area for MOSFET switches by holding rail voltage below 47V during 10/1000µs surges. | Use Scenario: -48V DC power interface in network equipment exposed to lightning-induced surges on building entry lines. IC Role / Device Role / Timing Role: First-stage unidirectional suppressor on feed line, coordinated with downstream GDT and MOV for staged protection. Use Value: Provides precise 46.6V clamping threshold compatible with -48V system headroom and telecom safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A | Lower VBR range (28.9–31.9V), tighter tolerance; same VC (42.1V) and IPP (14.9A) | Better suited for designs requiring lower turn-on threshold and reduced clamping voltage | Select SMBJ26A when tighter VBR distribution and lower clamping are prioritized over margin for aging or temperature drift |
| SMBJ24 | 24V VWM, 26.7–32.6V VBR, 43.0V VC @ 14.6A - lower stand-off and clamping than SMBJ26 | Used where system nominal voltage is 24V with tighter transient margin; not interchangeable at 26V rail | Choose SMBJ24 only if design operates at ≤24V nominal and requires earlier clamping onset |
Compared with SMBJ26, SMBJ26A offers improved VBR consistency and lower clamping voltage for tighter protection windows, while SMBJ24 provides earlier conduction at lower system voltages - neither is pin-compatible drop-in replacement without verifying VWM alignment and clamping margin against the protected IC's absolute maximum ratings.
Availability
SMBJ26 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting systems, and telecom power interfaces requiring stable component supply and ISO 7637-2 validated surge resilience.
Supply support for SMBJ26 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and bipolar transistors since 1979.
The SMBJ series was developed specifically for high-reliability surface-mount surge protection in automotive and industrial environments, emphasizing ISO 7637-2 compliance, thermal robustness, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMBJ26 under standard 10/1000µs surge conditions?
The SMBJ26 has a maximum clamping voltage (VC) of 46.6V at 13.5A peak impulse current (IPP), measured using the standardized 10/1000µs double-exponential waveform per ANSI/IEEE C62.35. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and must be compared directly against the absolute maximum ratings of downstream components.
Is SMBJ26 suitable for bidirectional transient protection?
No, SMBJ26 is a unidirectional TVS diode intended for DC line protection with defined polarity (cathode marked). For bidirectional applications such as AC lines or data buses, use SMBJ26C or SMBJ26CA variants - these have symmetrical breakdown characteristics in both directions and lack polarity marking.
What is the leakage current specification for SMBJ26 at its working stand-off voltage?
The SMBJ26 exhibits a maximum blocking leakage current (ID) of 1µA at its 26V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage ensures minimal power loss in always-on systems and avoids false triggering in high-impedance sensing circuits powered from the same rail.
Does SMBJ26 meet automotive qualification standards beyond ISO 7637-2?
While SMBJ26 is explicitly tested and compliant with ISO 7637-2 Pulse 1/2a/2b/3a/3b for electrical transient immunity, it is not AEC-Q200 qualified. For automotive-grade applications requiring full AEC-Q200 stress testing (e.g., temperature cycling, humidity bias, mechanical shock), designers should verify qualification status with Taiwan Semiconductor's latest product release documentation or select an AEC-Q200–certified variant.
What is the thermal resistance from junction to ambient (RθJA) for SMBJ26 in standard PCB mounting?
The SMBJ26 has a typical junction-to-ambient thermal resistance (RθJA) of 55°C/W when mounted on a standard FR-4 PCB with minimum recommended copper pad area per JEDEC standards. This value assumes no additional heatsinking; actual RθJA improves significantly with increased copper area or thermal vias, which is essential for sustained surge duty cycles or elevated ambient temperatures.
SMBJ26 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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:
- 46.6V
- Current - Peak Pulse (10/1000µs):
- 13.5A
- 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 (SMB)
SMBJ26 FAQ
1.How can I place an order for SMBJ26 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26 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 SMBJ26 reliable?
The price and inventory of SMBJ26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26 is usually 5 days.
3.What payment methods are accepted for SMBJ26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26?
SMBJ26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26 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 SMBJ26?
For technical support, including SMBJ26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26 requirements.
6.How does Aetrix verify that SMBJ26 is sourced from the original manufacturer or authorized distributors?
All SMBJ26 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 SMBJ26 meets industry standards.
7.What is the process for return or replacement of SMBJ26?
All SMBJ26 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26, 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 SMBJ26 part is unused and in its original packaging.
Return procedure for SMBJ26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26 Tags
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