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Taiwan Semiconductor Corporation SMAJ26CH
- Part No.:
- SMAJ26CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CH.pdf
- Description:
- TVS DIODE 26VWM 46.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,613
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Product details
Overview
SMAJ26CH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 26V working stand-off voltage (VWM), 28.9–35.3V breakdown voltage (VBR), and 46.6V clamping voltage (VC) at 8.6A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ 26V), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the SMAJ26CH datasheet, SMAJ26CH pinout, SMAJ26CH application, or SMAJ26CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional polarity marking, DO-214AC thermal derating above 25°C, and compatibility with automated SMT placement per J-STD-002 solderability.
Technical Context
The SMAJ26CH employs a glass-passivated silicon junction optimized for high-energy transient suppression using a 10/1000μs waveform. Its unidirectional configuration provides reverse-biased clamping only, with forward conduction limited to 3.5V at 25A and IFSM rating of 40A (8.3ms half-sine).
Thermal design requires adherence to TJ max = 150°C with derating per Fig.2; steady-state power dissipation is 1W, and moisture sensitivity is rated Level 1 (J-STD-020). Polarity is marked by cathode band on the DO-214AC case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 28.9 V / 35.3 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold tolerance |
| VC @ IPPM | 46.6 V - Clamped voltage across device during 8.6 A 10/1000μs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling capability under standard 10/1000μs waveform |
| IR @ VWM | <1 μA - Reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | 150 °C - Maximum junction temperature; requires PCB thermal relief and ambient derating above 25°C |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, UL 94V-0 flammability rating, 0.060g weight, and cathode band marking for polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Cathode-referenced node | Connected to lower-potential side (e.g., GND) in unidirectional TVS configuration |
| Cathode | Clamping reference / Surge return path | Connected to protected line (e.g., 24V rail); clamps transients toward anode when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under humidity and thermal stress |
| Fast response time <1.0 ps | Enables effective suppression of nanosecond-scale EFT/burst transients before IC damage occurs |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier inputs against switching-induced voltage spikes and load dump transients. IC Role / Device Role: Unidirectional TVS placed across input rails or between gate and source to clamp overshoot and prevent latch-up. Use Value: SMAJ26CH's 46.6V clamping ensures safe operation of 24V-rated controllers and MOSFETs while surviving 400W surges per ISO 7637-2 Pulse 1. | Use Scenario: Input surge protection for point-of-load (POL) converters in automotive ADAS modules exposed to battery line transients. IC Role / Device Role: Line-to-ground TVS on 24V input bus upstream of buck controller to limit voltage seen by input capacitors and ICs. Use Value: With VWM = 26V and VC = 46.6V, SMAJ26CH allows normal 24V operation while clamping ISO 7637-2 Pulse 2b events to non-destructive levels. |
| Lighting Application | Automotive Body Control Module (BCM) |
Use Scenario: Transient suppression on LED driver supply lines in headlamp or tail lamp assemblies subject to load dump and ESD. IC Role / Device Role: Unidirectional TVS connected between LED string anode and chassis ground to absorb reverse EMF from inductive ballasts. Use Value: SMAJ26CH's low IR (<1μA) avoids parasitic current paths in always-on lighting circuits, and its DO-214AC footprint supports high-density LED board layouts. | Use Scenario: Input rail protection for microcontroller-based BCMs receiving switched 12V/24V from vehicle battery and ignition systems. IC Role / Device Role: Primary overvoltage clamp on main power input, coordinated with fuse and LC filter to meet OEM EMC and durability specs. Use Value: AEC-Q101 qualification and ISO 7637-2 compliance ensure SMAJ26CH meets Tier-1 BCM validation requirements without additional system-level testing overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Lower VBR range (28.9–31.9V vs. 28.9–35.3V); tighter breakdown tolerance | Preferred where tighter clamping consistency is required across production lots | Select SMAJ26A if VBR matching and reduced VC variation are critical; SMAJ26CH offers broader VBR margin for cost-sensitive designs |
| SMBJ26CH | Same electrical specs but DO-214AA (SMB) package - 2.5mm wider body, higher thermal mass | Better thermal performance in high-ambient or high-duty-cycle surge environments | Choose SMBJ26CH when PCB layout allows larger footprint and improved power derating is needed; SMAJ26CH suits space-constrained SMT designs |
Compared with SMAJ26A and SMBJ26CH, the SMAJ26CH balances tighter VBR control than SMBJ26CH and smaller footprint than SMBJ26CH while offering broader VBR tolerance than SMAJ26A-making it optimal for general-purpose 24V automotive and industrial rail protection where layout density and qualification compliance are prioritized.
Availability
SMAJ26CH is available at Aetrix Electronics and suitable for automotive power electronics, industrial DC/DC converters, and LED lighting systems requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMAJ26CH 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 power management devices.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 qualification, robust surge handling, and SMT manufacturability.
FAQ
What is the clamping voltage of SMAJ26CH and how is it measured?
The SMAJ26CH has a maximum clamping voltage (VC) of 46.6 V, measured at 8.6 A peak impulse current (IPPM) using the standardized 10/1000 μs double-exponential waveform per IEC 61000-4-5 and ISO 7637-2. This value represents the upper limit of voltage imposed on protected circuitry during worst-case surge events and is guaranteed across temperature and production lot variations.
Is SMAJ26CH unidirectional or bidirectional, and how is polarity identified?
SMAJ26CH is a unidirectional TVS diode. Polarity is identified by a cathode band marked on the DO-214AC (SMA) package body; the banded end connects to the protected line (e.g., 24V rail), while the unbanded end connects to ground or lower potential. Bidirectional variants use "CAH" suffix (e.g., SMAJ26CAH), not applicable to SMAJ26CH.
Does SMAJ26CH meet automotive qualification standards?
Yes, SMAJ26CH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its qualification includes temperature cycling, high-temperature reverse bias (HTRB), and mechanical robustness tests mandated for automotive-grade discrete components.
What is the maximum steady-state power dissipation for SMAJ26CH?
The SMAJ26CH has a steady-state power dissipation (PD) rating of 1 W at TA = 25°C. This value applies only to continuous DC or low-frequency reverse leakage conditions-not surge events. Thermal design must account for derating above 25°C per Fig.2 in the datasheet, with TJ max = 150°C limiting allowable ambient and PCB copper area.
Can SMAJ26CH be used in place of SMAJ26A in existing designs?
SMAJ26CH and SMAJ26A share identical package, pinout, VWM, and PPPM ratings, but differ in VBR range: SMAJ26CH is 28.9–35.3 V, while SMAJ26A is 28.9–31.9 V. Substitution is electrically permissible, though SMAJ26CH may exhibit slightly higher clamping in some units due to broader VBR tolerance; verify system-level clamping margin if replacing SMAJ26A with SMAJ26CH.
SMAJ26CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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:
- 46.6V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ26CH FAQ
1.How can I place an order for SMAJ26CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CH 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 SMAJ26CH reliable?
The price and inventory of SMAJ26CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CH is usually 5 days.
3.What payment methods are accepted for SMAJ26CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CH?
SMAJ26CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CH 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 SMAJ26CH?
For technical support, including SMAJ26CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CH requirements.
6.How does Aetrix verify that SMAJ26CH is sourced from the original manufacturer or authorized distributors?
All SMAJ26CH 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 SMAJ26CH meets industry standards.
7.What is the process for return or replacement of SMAJ26CH?
All SMAJ26CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CH, 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 SMAJ26CH part is unused and in its original packaging.
Return procedure for SMAJ26CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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