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Taiwan Semiconductor Corporation SMBJ26CAH
- Part No.:
- SMBJ26CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CAH.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
SMBJ26CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 26 V working stand-off voltage (VWM), 42.1 V maximum clamping voltage (VC@IPP) at 14.9 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ26CAH datasheet, SMBJ26CAH pinout, SMBJ26CAH application, or SMBJ26CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and low leakage (<1 µA @ 26 V) in harsh ambient environments.
Technical Context
The SMBJ26CAH is a glass-passivated, single-die, bidirectional TVS diode optimized for fast transient suppression on DC power lines and signal interfaces. Its breakdown voltage range (28.9–31.9 V) ensures reliable triggering above system operating voltage while maintaining margin against false triggering.
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, supporting operation up to +150 °C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, enabling robust reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 28.9 V / 31.9 V - Breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC@IPP | 42.1 V - Clamps transients to ≤42.1 V at 14.9 A peak pulse current (10/1000 µs waveform) |
| PPK | 600 W - Peak pulse power handling capacity under standardized surge conditions |
| IPP | 14.9 A - Maximum non-repetitive surge current the device safely clamps without failure |
| ID@VWM | <1 µA - Extremely low leakage ensures minimal standby power loss and signal integrity |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial enclosures |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; polarity-sensitive for unidirectional variants, but SMBJ26CAH is bidirectional - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Both terminals function identically; no polarity dependency - enables placement flexibility on PCB |
| Case | Thermal conduction path | Exposed metal frame provides thermal dissipation path to PCB copper; requires adequate copper pour for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC standard |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Withstands automotive load dump (Pulse 2b), coupled transients (Pulse 1/3a/3b), and switching noise (Pulse 2a) |
| Fast response time | <1.0 ps - Limits voltage overshoot during nanosecond-scale ESD events (IEC 61000-4-2) |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life compliance |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power supply and microcontroller VCC rails from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector entry point and IC power pins. Use Value: Limits transient voltage to ≤42.1 V, preventing latch-up or permanent damage to 3.3 V/5 V logic and CAN transceivers. | Use Scenario: Safeguarding analog input channels (4–20 mA, 0–10 V) and digital outputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary front-end surge limiter on terminal blocks and signal conditioning stages. Use Value: Maintains sub-1 µA leakage at 26 V, avoiding measurement drift while clamping 1 kV/500 A transients per IEC 61000-4-5. |
| LED Driver Power Stage | Automotive Lighting Module |
Use Scenario: Protecting buck/boost LED driver ICs and MOSFETs from inductive kickback during PWM dimming and hot-swap events. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor and switch node. Use Value: 600 W peak power rating absorbs repetitive 10/1000 µs surges without degradation, extending driver lifetime. | Use Scenario: Shielding headlamp control units from battery reversal, jump-start transients, and alternator ripple in 12 V/24 V systems. IC Role / Device Role / Timing Role: Bidirectional clamp on main power input and LIN bus lines. Use Value: AEC-Q101 qualification and -55 °C to +150 °C operation ensure reliability across full vehicle thermal envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ26CA | Same VWM (26 V), slightly higher VC (45.7 V @ 13.1 A), identical DO-214AC (SMA) footprint but smaller package (lower PPK = 400 W) | Lower power handling limits use to lower-energy transients; not recommended for ISO 7637-2 Pulse 2b load dump | Select only when space-constrained and surge energy is limited to ≤400 W |
| Vishay SMA6J26CA | VWM = 26 V, VC = 42.5 V @ 14.1 A, same 600 W rating, but AEC-Q101 not explicitly stated in public datasheet | Lacks documented automotive qualification; suitable for industrial but not safety-critical automotive ECUs | Prefer for cost-sensitive industrial designs where AEC-Q101 is not mandated |
Compared with SMAJ26CA and SMA6J26CA, SMBJ26CAH delivers superior thermal robustness (RθJA = 55 °C/W vs. ~65–70 °C/W), verified AEC-Q101 qualification, and tighter VBR tolerance (28.9–31.9 V), making it the preferred choice for automotive power rail protection requiring consistent clamping behavior across temperature and life cycle.
Availability
SMBJ26CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting systems, and power supply input stages requiring stable component supply and full AEC-Q101 compliance.
Supply support for SMBJ26CAH 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 MOSFETs with global distribution and automotive qualification capabilities.
The SMBJH series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in compact SMB packages.
FAQ
What does the "CAH" suffix indicate in SMBJ26CAH?
The "CAH" suffix denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional "H" variants, SMBJ26CAH clamps transients equally in both directions - critical for AC-coupled lines, LIN bus, or floating power domains where polarity is undefined. This is confirmed in TSC's ordering information and electrical specifications table.
Is SMBJ26CAH suitable for protecting a 24 V automotive CAN transceiver?
Yes - SMBJ26CAH is explicitly validated for ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (supply line interruption), and Pulse 3a/3b (capacitive coupling). With VWM = 26 V, it remains non-conductive during normal 24 V operation while clamping transients to ≤42.1 V, well below the absolute maximum rating of most CAN transceivers (typically 40–58 V).
How does SMBJ26CAH differ from SMBJ26AH?
SMBJ26AH is unidirectional with cathode marking and forward voltage drop (~3.5 V), whereas SMBJ26CAH is bidirectional with symmetrical clamping and no polarity marking. Electrical differences include lower VBR (28.9–31.9 V vs. 28.9–35.3 V) and tighter clamping (42.1 V vs. 46.6 V). SMBJ26CAH is required where reverse-polarity transients or AC signals must be protected.
What is the maximum allowable PCB trace length between SMBJ26CAH and protected IC power pins?
To maintain effective clamping, PCB trace inductance must be minimized - typical design guidance limits total inductance to ≤10 nH. For SMBJ26CAH, this translates to ≤5 mm total trace length (including vias and pads) from device cathode/anode to IC VCC/GND pins. Longer traces increase overshoot and reduce protection efficacy, especially for fast ESD events.
Does SMBJ26CAH require derating at elevated ambient temperatures?
Yes - SMBJ26CAH's peak pulse power must be derated above 25 °C per Figure 2 in the TSC datasheet. At 85 °C ambient, PPK is reduced to ~420 W (70% of 600 W); at 125 °C, it drops to ~240 W (40%). Designers must verify worst-case transient energy against derated ratings using actual board-level thermal measurements.
SMBJ26CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ26CAH FAQ
1.How can I place an order for SMBJ26CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CAH 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 SMBJ26CAH reliable?
The price and inventory of SMBJ26CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26CAH is usually 5 days.
3.What payment methods are accepted for SMBJ26CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CAH?
SMBJ26CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CAH 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 SMBJ26CAH?
For technical support, including SMBJ26CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CAH requirements.
6.How does Aetrix verify that SMBJ26CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ26CAH 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 SMBJ26CAH meets industry standards.
7.What is the process for return or replacement of SMBJ26CAH?
All SMBJ26CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CAH, 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 SMBJ26CAH part is unused and in its original packaging.
Return procedure for SMBJ26CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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