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Taiwan Semiconductor Corporation SMAJ26CA
- Part No.:
- SMAJ26CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CA.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,473
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Product details
Overview
SMAJ26CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 26 V working stand-off voltage (VWM), 28.9–31.9 V breakdown voltage (VBR), 42.1 V maximum clamping voltage (VC) at 9.5 A peak impulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supplies and industrial DC/DC converters.
For engineers reviewing the SMAJ26CA datasheet, SMAJ26CA pinout, SMAJ26CA application, or SMAJ26CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, <1 µA reverse leakage above 10 V, and DO-214AC mechanical compatibility with automated SMT placement.
Technical Context
The SMAJ26CA implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. Its unidirectional counterpart is SMAJ26A; the "C" suffix denotes bidirectional configuration, enabling symmetric clamping in both polarities without external polarity management.
It operates across –55 °C to +150 °C junction temperature range, supports 40 A non-repetitive forward surge (8.3 ms half-sine), and maintains <3.5 V forward voltage at 25 A - critical for low-loss crowbar or clamp-based protection schemes where forward conduction may occur during fault events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR @ IT=1 mA | 28.9–31.9 V - verified breakdown onset under standardized test; ensures predictable turn-on within tolerance band |
| VC @ IPPM=9.5 A | 42.1 V - clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels |
| PPPM | 400 W - peak pulse power handling per JEDEC standard; sustains high-energy transients without failure |
| IR @ VWM | <1 µA - ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| Response time | <1.0 ps - enables suppression of ESD and fast-edge switching noise before system damage occurs |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, polarity indicated by cathode band (bidirectional operation renders band non-polar; used only for orientation reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional terminal pair | Identical electrical behavior in either direction; no functional anode/cathode distinction - symmetrical clamping path |
| Case | Non-connected mechanical body | No internal thermal or electrical connection to die; serves only as structural support and heat-sinking interface |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching immunity without external filtering |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning |
| Halogen-free (IEC 61249-2-21) | Meets RoHS and environmental compliance mandates for green electronics manufacturing |
| Automated placement compatibility | DO-214AC footprint and lead geometry optimized for pick-and-place accuracy and solder joint consistency |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 24 V vehicle subsystems (e.g., infotainment, ADAS sensors) against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt energy before it reaches downstream regulators and microcontrollers. Use Value: Withstands 400 W pulses per ISO 7637-2 Pulse 5a while limiting clamped voltage to 42.1 V - well below 48 V absolute max ratings of most 24 V-rated ICs. | Use Scenario: Safeguarding isolated DC/DC converter primary-side inputs in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing switching spikes from MOSFET bridge shoot-through or transformer leakage inductance. Use Value: Sub-1 ps response captures nanosecond-scale ringing; 42.1 V clamping prevents regulator latch-up or gate oxide damage in upstream FET drivers. |
| LED Driver Overvoltage Suppression | Telecom Power Interface |
Use Scenario: Securing constant-current LED driver inputs in streetlight and architectural lighting against surges on AC/DC front-end outputs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after bulk capacitor to absorb residual line transients not filtered by X/Y caps and common-mode chokes. Use Value: 26 V VWM matches typical 24 V nominal LED bus; 400 W rating handles repeated lightning-induced surges without degradation. | Use Scenario: Protecting PoE-powered device inputs (e.g., IP cameras, wireless APs) from induced surges on Ethernet cabling. IC Role / Device Role / Timing Role: Bidirectional clamp on DC input rail to suppress differential-mode transients coupled onto powered pairs. Use Value: Symmetric clamping eliminates need for dual unidirectional devices; DO-214AC footprint minimizes PCB area versus SMB/SMC alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ26CA | Identical electrical specs, same DO-214AC package, identical marking and testing standards; minor process variation in leakage distribution | No functional difference; validated drop-in replacement per Littelfuse datasheet Rev. D | Select when dual-sourcing required or preferred distributor stock availability favors Littelfuse |
| ON Semiconductor SMAJ26CA | Same VWM, VBR, VC, and PPPM; slightly tighter VBR min/max spread (28.9–31.5 V vs. 28.9–31.9 V) | Compatible in all SMAJ26CA applications; marginally improved consistency in high-volume production screening | Choose for tighter parametric control where VBR distribution impacts yield in precision clamp thresholds |
Compared with Littelfuse and ON Semiconductor equivalents, the Taiwan Semiconductor SMAJ26CA offers identical clamping performance and ISO 7637-2 compliance but with broader VBR tolerance - advantageous for cost-sensitive designs where minor variation in turn-on voltage is acceptable.
Availability
SMAJ26CA is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver overvoltage suppression requiring stable component supply and full traceability.
Supply support for SMAJ26CA 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, and power MOSFETs since 1979.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, extended temperature operation, and automated assembly readiness.
FAQ
What does the "CA" suffix mean in SMAJ26CA?
The "CA" suffix in SMAJ26CA indicates a bidirectional TVS diode configuration with a center-tapped or symmetrical junction structure. Unlike unidirectional variants (e.g., SMAJ26A), SMAJ26CA provides identical clamping behavior for both positive and negative transients - eliminating the need for polarity-aware layout and enabling use in AC-coupled or floating-rail applications. This is confirmed in TSC's documentation stating "For bidirectional use C or CA suffix for types SMAJ5.0 – SMAJ188".
Is SMAJ26CA compliant with automotive transient standards?
Yes, SMAJ26CA meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b waveforms - explicitly cited in the official Taiwan Semiconductor datasheet. Its 400 W peak pulse power rating, 42.1 V clamping voltage at 9.5 A, and –55 °C to +150 °C operating range make it suitable for 12 V and 24 V automotive subsystems including body control modules and sensor interfaces. The device is not rated for Pulse 5a (load dump), which requires higher energy handling.
What is the maximum clamping voltage of SMAJ26CA and under what test condition?
The maximum clamping voltage of SMAJ26CA is 42.1 V, measured at a peak impulse current (IPPM) of 9.5 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage imposed on protected circuitry during a transient event - a critical parameter for ensuring downstream ICs remain within their absolute maximum ratings.
Can SMAJ26CA be used in place of a unidirectional TVS like SMAJ26A?
No - SMAJ26CA and SMAJ26A are not interchangeable without circuit review. SMAJ26CA is bidirectional and clamps symmetrically in both polarities, while SMAJ26A is unidirectional and conducts only in reverse bias. Replacing SMAJ26A with SMAJ26CA in a polarity-sensitive design (e.g., with series blocking diodes) may cause unintended forward conduction or altered clamping thresholds. Layout and schematic validation are required before substitution.
What is the moisture sensitivity level (MSL) of SMAJ26CA and how does it affect assembly?
SMAJ26CA has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not sensitive to moisture and can be stored indefinitely at ambient conditions without baking prior to reflow soldering. This eliminates pre-bake steps, reduces assembly cycle time, and avoids thermal stress risks associated with moisture-induced popcorning - making SMAJ26CA ideal for high-throughput SMT lines and just-in-time manufacturing workflows.
SMAJ26CA 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:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ26CA FAQ
1.How can I place an order for SMAJ26CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CA 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 SMAJ26CA reliable?
The price and inventory of SMAJ26CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CA is usually 5 days.
3.What payment methods are accepted for SMAJ26CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CA?
SMAJ26CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CA 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 SMAJ26CA?
For technical support, including SMAJ26CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CA requirements.
6.How does Aetrix verify that SMAJ26CA is sourced from the original manufacturer or authorized distributors?
All SMAJ26CA 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 SMAJ26CA meets industry standards.
7.What is the process for return or replacement of SMAJ26CA?
All SMAJ26CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CA, 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 SMAJ26CA part is unused and in its original packaging.
Return procedure for SMAJ26CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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