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Taiwan Semiconductor Corporation SMA4F26AH
- Part No.:
- SMA4F26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F26AH.pdf
- Description:
- 400W, 30.6V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,766
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Product details
Overview
SMA4F26AH 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; it is AEC-Q101 qualified and used in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F26AH datasheet, SMA4F26AH pinout, SMA4F26AH application, or SMA4F26AH equivalent, key selection criteria include unidirectional polarity, Thin SMA package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and compliance with J-STD-020 level 1 moisture sensitivity.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast transient suppression in automotive-grade power electronics. Its unidirectional configuration provides reverse-biased clamping only, with forward voltage of 3.5V at 25A enabling use as a polarity-protected surge clamp in DC bus lines.
The device operates across –55°C to +175°C junction temperature range and delivers 400W non-repetitive peak pulse power under 10/1000μs waveform. Thermal resistance values (RθJA = 62°C/W, RθJC = 16°C/W) are measured on a 5mm × 5mm copper pad PCB, defining its derating behavior above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR @ IT=1mA | 29.1–32.1 V - Verified breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=9.5A | 42.2 V - Clamped voltage limiting downstream circuit stress during 10/1000µs surge |
| PPPM | 400 W - Peak pulse power handling capability per single transient event |
| TJ max | +175°C - Enables operation in under-hood automotive environments without thermal shutdown |
| RθJL | 20°C/W - Low junction-to-lead thermal resistance supports high-power pulse dissipation into PCB copper |
Pinout & Package
Thin SMA package: surface-mount, unidirectional, cathode-banded leaded plastic case conforming to JEDEC DO-214AC outline; 0.030g mass; UL 94V-0 rated molding compound; matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); conducts when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive powertrain and chassis applications per stress test requirements |
| Glass passivated junction | Enhanced long-term stability and reduced parameter drift under thermal cycling and humidity exposure |
| VBR tempco ≤ 0.095%/°C | Predictable breakdown voltage shift over temperature, simplifying worst-case surge margin analysis |
| J-STD-020 Level 1 MSL | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning |
| Halogen-free per IEC 61249-2-21 | Complies with automotive OEM environmental material declarations and end-of-life recycling mandates |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback and load dump transients on 24V BLDC inverter DC bus lines. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between high-side MOSFET source and ground to limit voltage overshoot during switching. Use Value: Limits clamped voltage to 42.2V, protecting 45V-rated gate drivers and MCU supply rails from destructive overvoltage. | Use Scenario: Guards cell monitoring IC inputs and communication lines against ESD and coupling surges in 12–48V battery packs. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor on analog front-end signal paths and CAN/LIN bus interfaces. Use Value: 1 µA max leakage at 26V ensures minimal impact on precision voltage sensing accuracy over temperature. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Protects LED driver ICs and microcontrollers from load dump and ISO 7637-2 pulse 5a/b transients in headlamp modules. IC Role / Device Role / Timing Role: Primary surge clamp on 12V input rail upstream of buck controller and gate drivers. Use Value: 400W peak power rating sustains multiple ISO 7637-2 pulses without degradation, supporting ASIL-B system robustness. | Use Scenario: Shields secondary-side rectifiers and feedback optocouplers in 24V-output industrial SMPS units. IC Role / Device Role / Timing Role: Secondary-rail TVS on output capacitor node to absorb reflected flyback energy and line-induced spikes. Use Value: 175°C max junction temperature allows placement near hot components without thermal derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Same 26V VWM, but 400W PPPM with higher VC = 43.0V; RθJA = 65°C/W vs. 62°C/W | Marginally higher clamping voltage reduces protection margin for 45V-rated ICs | Acceptable where layout allows slightly higher VC and thermal margin is sufficient |
| SMBJ26A | Same VWM/VBR specs but SMB package (DO-214AA); 600W PPPM, larger footprint, RθJA = 40°C/W | Higher power rating enables longer surge duration tolerance but requires 30% more board area | Preferred when extended pulse immunity is required and space permits larger package |
Compared with SMAJ26A and SMBJ26A, SMA4F26AH offers tighter VC (42.2V), superior thermal resistance in Thin SMA form factor, and AEC-Q101 validation-making it optimal for space-constrained, thermally demanding automotive modules.
Availability
SMA4F26AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, and lighting control applications requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMA4F26AH 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.
The SMA4FxxAH series is part of TSC's AEC-Q101-qualified Thin SMA TVS platform, designed specifically for compact, high-reliability transient suppression in automotive power electronics and industrial DC systems.
FAQ
What is the maximum clamping voltage of the SMA4F26AH under a 10/1000µs surge?
The SMA4F26AH has a maximum clamping voltage (VC) of 42.2 V when subjected to a 9.5 A peak pulse current with a 10/1000 µs waveform. This value is specified in the Electrical Specifications table and defines the upper voltage limit imposed on protected circuits during transient events. The SMA4F26AH maintains this clamping performance across its full operating temperature range and is validated per AEC-Q101 stress testing protocols.
Is the SMA4F26AH suitable for bidirectional transient protection?
No, the SMA4F26AH is a unidirectional TVS diode and is not suitable for bidirectional protection. Its electrical specifications-including forward voltage (VF = 3.5 V @ 25 A) and absence of symmetric breakdown data-confirm single-quadrant operation. For bidirectional applications, designers must select a specifically rated bidirectional variant such as SMA4F26AY or equivalent. The SMA4F26AH datasheet explicitly states polarity as "Uni-directional" in the Mechanical Data section.
What is the moisture sensitivity level (MSL) rating for the SMA4F26AH?
The SMA4F26AH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH without baking prior to surface-mount reflow. This eliminates pre-reflow bake cycles in standard SMT lines and supports immediate placement after dry-pack opening. The MSL rating is confirmed in the FEATURES section of the official Taiwan Semiconductor datasheet revision C2103.
Does the SMA4F26AH meet halogen-free and RoHS requirements?
Yes, the SMA4F26AH is both RoHS compliant and halogen-free per IEC 61249-2-21. These environmental qualifications are explicitly stated in the FEATURES section of the datasheet and verified through material composition analysis. Halogen-free status ensures no brominated or chlorinated flame retardants are present in the molding compound, supporting automotive OEM sustainability and end-of-life processing requirements.
What is the thermal resistance from junction to ambient (RθJA) for the SMA4F26AH?
The junction-to-ambient thermal resistance (RθJA) of the SMA4F26AH is 62°C/W, measured on a standard 5 mm × 5 mm copper pad test board per JEDEC JESD51-2. This value governs steady-state power derating above 25°C ambient and is critical for calculating safe operating area in continuous surge scenarios. The datasheet confirms this parameter in the THERMAL PERFORMANCE table and correlates it with Fig.2 Steady State Power Derating.
SMA4F26AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA4F
- 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:
- Thin SMA
SMA4F26AH FAQ
1.How can I place an order for SMA4F26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F26AH 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 SMA4F26AH reliable?
The price and inventory of SMA4F26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F26AH is usually 5 days.
3.What payment methods are accepted for SMA4F26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F26AH?
SMA4F26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F26AH 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 SMA4F26AH?
For technical support, including SMA4F26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F26AH requirements.
6.How does Aetrix verify that SMA4F26AH is sourced from the original manufacturer or authorized distributors?
All SMA4F26AH 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 SMA4F26AH meets industry standards.
7.What is the process for return or replacement of SMA4F26AH?
All SMA4F26AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F26AH, 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 SMA4F26AH part is unused and in its original packaging.
Return procedure for SMA4F26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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