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Taiwan Semiconductor Corporation SMBJ26AH
- Part No.:
- SMBJ26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26AH.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,377
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Product details
Overview
SMBJ26AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 26 V working stand-off voltage, 42.1 V maximum clamping voltage at 14.9 A peak pulse current, 600 W peak pulse power rating, and AEC-Q101 qualification for automotive reliability.
For engineers reviewing the SMBJ26AH datasheet, SMBJ26AH pinout, SMBJ26AH application, or SMBJ26AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b waveforms, low leakage (<1 µA at 26 V), DO-214AA (SMB) package compatibility, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMBJ26AH operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transients and stable breakdown behavior. Its unidirectional configuration provides reverse-biased clamping only, with forward voltage drop of 3.5 V at 50 A for this voltage grade (per note 2 in Absolute Maximum Ratings).
Thermal performance is defined by 10 °C/W junction-to-case and 55 °C/W junction-to-ambient resistance, supporting sustained operation up to 150 °C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 28.9 V / 31.9 V - Breakdown occurs within this range at 1 mA test current, ensuring predictable clamping onset |
| VC @ IPP | 42.1 V at 14.9 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs transient, per IEC 61000-4-5 |
| ID @ VWM | <1 µA - Minimal leakage at rated stand-off, preserving system efficiency and battery life |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side for protected line (e.g., +12V rail) | Connected to supply; conducts only during forward surge (rare in TVS use) |
| Cathode | Clamp node tied to ground or reference | Reverse-biased during normal operation; avalanches to shunt surge energy to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements (HTOL, TC, HAST, etc.) |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Guaranteed protection against load dump (Pulse 5a/b), switching transients (Pulse 1/2a/2b), and EFT (Pulse 3a/3b) |
| Fast response time | <1.0 ps enables clamping before sensitive ICs experience overvoltage damage |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp reverse transients. Use Value: Limits clamped voltage to 42.1 V, well below typical 36 V absolute max ratings of automotive PMICs and microcontrollers. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) connected to long cables in factory automation. IC Role / Device Role / Timing Role: TVS on signal line (e.g., 4–20 mA loop or CAN stub) referenced to local ground. Use Value: Sub-1 ps response prevents ESD-induced latch-up in precision op-amps and ADC front-ends. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Surge Suppression |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers exposed to 12 V supply surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor to divert surge energy away from controller IC. Use Value: 600 W peak power rating absorbs ISO 7637-2 Pulse 1 (inductive kick) without degradation. | Use Scenario: Shielding buck converter ICs from line transients in telecom or industrial power supplies. IC Role / Device Role / Timing Role: Primary-side TVS on VIN pin to limit input voltage seen by internal MOSFETs and gate drivers. Use Value: 26 V VWM matches common 24 V nominal systems, while 42.1 V VC ensures safe margin below 45 V IC abs-max ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ26A | Same DO-214AC (SMA) package; 43.0 V VC @ 14.3 A; slightly higher clamping voltage | Lower power rating (400 W); less suitable for ISO 7637-2 Pulse 5a (load dump) | Select SMBJ26AH for higher surge robustness and AEC-Q101 validation where automotive qualification is mandatory |
| Vishay SMF26A | DO-219AB (SOD-123FL) package; 42.0 V VC @ 14.3 A; lower thermal resistance (RθJA = 125 °C/W) | Lower PPK (200 W); intended for board-level ESD, not system-level surge | Choose SMBJ26AH when 600 W capability and automotive-grade reliability are required for main power rail protection |
Compared with SMAJ26A and SMF26A, SMBJ26AH delivers superior surge immunity (600 W vs. 400 W/200 W), AEC-Q101 certification, and lower clamping voltage in its class-making it optimal for primary protection in harsh automotive and industrial environments.
Availability
SMBJ26AH is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, LED lighting drivers, and DC-DC converter input stages requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ26AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and automotive-qualified components.
The SMBJH series was developed specifically for high-reliability transient suppression in automotive power distribution networks and industrial control systems, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance.
FAQ
What is the clamping voltage of SMBJ26AH and how is it measured?
The SMBJ26AH has a maximum clamping voltage (VC) of 42.1 V, measured at a peak pulse current (IPP) of 14.9 A using a standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per the manufacturer's electrical specifications table and reflects worst-case clamping performance under transient stress, directly protecting downstream ICs rated for ≤45 V absolute maximum input.
Is SMBJ26AH unidirectional or bidirectional, and how can I identify its polarity?
SMBJ26AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix (e.g., SMBJ26CH would be bidirectional). Polarity is marked on the DO-214AA (SMB) package with a cathode band; the banded end connects to ground or reference, while the anode connects to the protected line.
Does SMBJ26AH meet automotive qualification standards?
Yes, SMBJ26AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction-including glass passivation, JESD201 Class 2 whisker resistance, and MSL Level 1 handling-supports deployment in automotive body control modules, lighting systems, and infotainment power supplies.
What is the maximum operating temperature for SMBJ26AH?
The SMBJ26AH has a maximum junction temperature (TJ) of +150 °C and a storage temperature range of −55 °C to +150 °C. Its thermal resistance values (RθJC = 10 °C/W, RθJA = 55 °C/W) allow reliable operation in under-hood environments and sealed industrial enclosures when mounted on adequate copper area.
How does SMBJ26AH differ from SMBJ26H?
SMBJ26AH offers tighter breakdown voltage tolerance (28.9–31.9 V) versus SMBJ26H (28.9–35.3 V), resulting in more consistent clamping onset and lower risk of premature conduction. Both share identical VWM (26 V), PPK (600 W), and package (DO-214AA), but SMBJ26AH is preferred where precise voltage threshold control is critical for system-level surge margin.
SMBJ26AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 14.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ26AH FAQ
1.How can I place an order for SMBJ26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26AH 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 SMBJ26AH reliable?
The price and inventory of SMBJ26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26AH is usually 5 days.
3.What payment methods are accepted for SMBJ26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26AH?
SMBJ26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26AH 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 SMBJ26AH?
For technical support, including SMBJ26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26AH requirements.
6.How does Aetrix verify that SMBJ26AH is sourced from the original manufacturer or authorized distributors?
All SMBJ26AH 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 SMBJ26AH meets industry standards.
7.What is the process for return or replacement of SMBJ26AH?
All SMBJ26AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26AH, 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 SMBJ26AH part is unused and in its original packaging.
Return procedure for SMBJ26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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