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Taiwan Semiconductor Corporation SMA4S26AH
- Part No.:
- SMA4S26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S26AH.pdf
- Description:
- TVS DIODE 26VWM 42.2VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:3,877
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Product details
Overview
SMA4S26AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 26V working stand-off voltage, 29.1–32.1V breakdown voltage at 1mA, and 42.2V clamping voltage at 9.5A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4S26AH datasheet, SMA4S26AH pinout, SMA4S26AH application, or SMA4S26AH equivalent, key selection criteria include unidirectional polarity, SOD-128 package thermal performance (RθJL = 20°C/W), AEC-Q101 qualification, and 175°C maximum junction temperature for under-hood reliability.
Technical Context
The SMA4S26AH operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its VBR range (29.1–32.1V). It clamps transients to ≤42.2V at 9.5A (10/1000µs waveform), delivering 400W non-repetitive peak pulse power with <1µA leakage at 26V.
Designed for high-reliability automotive environments, it features glass-passivated junction, JESD201 Class 2 whisker resistance, moisture sensitivity level 1, and UL 94V-0 molding compound - all validated per AEC-Q101 stress test requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 29.1–32.1 V - Breakdown voltage range defining turn-on threshold under standardized test conditions |
| VC @ IPPM=9.5A | 42.2 V - Clamped voltage during 10/1000µs surge, limiting downstream circuit stress |
| PPPM | 400 W - Peak pulse power handling capability for transient suppression without failure |
| TJ max | +175 °C - Maximum junction temperature enabling operation in under-hood automotive locations |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance supporting reliable heat transfer to PCB copper pads |
| Polarity | Unidirectional - Blocks reverse voltage only; conducts forward current up to 3.5V @ 25A |
Pinout & Package
Package: SOD-128 - Surface-mount plastic case with cathode band marking; 5mm × 5mm copper pad recommended for thermal performance; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in unidirectional TVS configuration; carries forward current up to 25A |
| Cathode (marked) | Reverse-biased clamping terminal | Connected to protected line; initiates avalanche breakdown when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per AEC stress requirements |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress |
| VBR tempco ≤ 0.095%/°C | Minimizes breakdown voltage shift across -55°C to +175°C operating range, improving design margin predictability |
| Moisture sensitivity level 1 | Enables standard SMT assembly without baking or dry-pack requirements prior to reflow |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally restricted substances |
Applications
| Automotive BLDC Motor Drive | Battery Management System (BMS) |
|---|---|
Use Scenario: Protection of gate drivers and MCU inputs against inductive switching spikes from 48V BLDC motor phases. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase traces and controller supply rails to clamp ESD and load-dump transients. Use Value: Limits voltage to ≤42.2V during 9.5A surges, preventing latch-up or permanent damage to 3.3V/5V logic and MOSFET gate oxides. | Use Scenario: Safeguarding cell monitoring ICs and communication interfaces (e.g., CAN, UART) in high-voltage EV battery packs. IC Role / Device Role / Timing Role: Standoff-rated TVS on analog front-end inputs and isolated data lines to suppress coupling from pack-level switching noise. Use Value: 26V VWM matches typical BMS auxiliary rail voltages while maintaining <1µA leakage to avoid measurement error. |
| Switching Mode Power Supply (SMPS) | LED Lighting Driver |
Use Scenario: Input-stage protection in 24–48V industrial SMPS units exposed to line surges and hot-swap events. IC Role / Device Role / Timing Role: Primary-side TVS parallel to bulk capacitor to absorb differential-mode transients before regulation stage. Use Value: 400W PPPM rating handles IEC 61000-4-5 Level 4 (4kV) surges without degradation when mounted on 5mm×5mm Cu pad. | Use Scenario: Output overvoltage protection in constant-current LED drivers for automotive headlamps and street lighting. IC Role / Device Role / Timing Role: Clamp device across LED string to prevent catastrophic failure during open-circuit or dimming transients. Use Value: 42.2V clamping ensures safe operation below typical 48V LED string Zener thresholds while sustaining repeated 10/1000µs pulses. |
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 PPPM (400W same), but higher VC (45.7V @ 8.8A); RθJA = 65°C/W vs. 62°C/W | Less effective clamping margin in high-current transients; slightly reduced thermal efficiency on PCB | Acceptable where 3.5V higher clamping voltage is within system tolerance and layout allows full thermal pad use |
| SMBJ26A | Same VWM/VBR, but SMB package (larger footprint); PPPM = 600W; RθJL = 15°C/W | Higher surge capacity and better thermal dissipation, but requires larger board area and different land pattern | Preferred for designs needing >400W margin or operating near thermal limits, provided space permits SMB footprint |
Compared with SMAJ26A and SMBJ26A, the SMA4S26AH delivers tighter clamping (42.2V), AEC-Q101 qualification out-of-box, and optimized SOD-128 thermal resistance (RθJL = 20°C/W), making it the preferred choice for space-constrained automotive and industrial TVS applications requiring verified reliability.
Availability
SMA4S26AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, and industrial switching mode power supplies requiring stable component supply with AEC-Q101 compliance and traceable sourcing.
Supply support for SMA4S26AH 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 for automotive, industrial, and consumer markets.
The SMA4SxxAH series was developed specifically for AEC-Q101-compliant transient suppression in compact, thermally demanding automotive subsystems - emphasizing low-leakage, stable VBR, and robust SOD-128 packaging.
FAQ
What is the maximum clamping voltage of the SMA4S26AH under standard test conditions?
The SMA4S26AH has a maximum clamping voltage (VC) of 42.2 V when subjected to a 10/1000 µs peak pulse current of 9.5 A at TA = 25°C. This value is measured per JEDEC standards and reflects the device's ability to limit transient voltage across protected circuits. The SMA4S26AH maintains this clamping performance across its rated junction temperature range, ensuring consistent protection in automotive and industrial environments.
Is the SMA4S26AH suitable for automotive applications?
Yes, the SMA4S26AH is AEC-Q101 qualified and designed for automotive use, including under-hood BLDC motor drives and battery management systems. Its glass-passivated junction, JESD201 Class 2 whisker resistance, moisture sensitivity level 1, and operation up to +175°C junction temperature meet stringent automotive reliability requirements. The SMA4S26AH is not intended for medical or life-sustaining systems per TSC documentation.
What is the polarity configuration of the SMA4S26AH?
The SMA4S26AH is a unidirectional TVS diode, meaning it functions as a reverse-biased avalanche clamp with forward conduction capability. Its cathode is marked by a band on the SOD-128 package. In normal operation, it blocks up to 26 V in reverse bias and conducts forward current up to 3.5 V at 25 A. This polarity enables precise placement on DC rails where bidirectional protection is unnecessary.
How does the thermal performance of the SMA4S26AH compare to similar SOD packages?
The SMA4S26AH achieves RθJL = 20°C/W and RθJA = 62°C/W when mounted on a 5 mm × 5 mm copper pad, outperforming many legacy SOD-123 or SMA devices. Its SOD-128 package provides larger thermal pad contact area and optimized leadframe design, enabling more efficient heat transfer from junction to PCB. This supports higher sustained power dissipation in compact layouts where airflow is limited.
What are the packaging and ordering details for the SMA4S26AH?
The SMA4S26AH is supplied in SOD-128 package format on tape-and-reel, with 14,000 units per reel. The device marking code is "4S026", and date/factory codes follow standard TSC conventions. No special handling is required due to its moisture sensitivity level 1 rating - it can be processed directly through standard SMT reflow without pre-baking. Full reel and cut-tape options are available through Aetrix Electronics.
SMA4S26AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-128
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 29.1V
- Voltage - Clamping (Max) @ Ipp:
- 42.2V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-128
SMA4S26AH FAQ
1.How can I place an order for SMA4S26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S26AH 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 SMA4S26AH reliable?
The price and inventory of SMA4S26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S26AH is usually 5 days.
3.What payment methods are accepted for SMA4S26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S26AH?
SMA4S26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S26AH 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 SMA4S26AH?
For technical support, including SMA4S26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S26AH requirements.
6.How does Aetrix verify that SMA4S26AH is sourced from the original manufacturer or authorized distributors?
All SMA4S26AH 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 SMA4S26AH meets industry standards.
7.What is the process for return or replacement of SMA4S26AH?
All SMA4S26AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S26AH, 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 SMA4S26AH part is unused and in its original packaging.
Return procedure for SMA4S26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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