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Taiwan Semiconductor Corporation SMA4F43AH
- Part No.:
- SMA4F43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F43AH.pdf
- Description:
- 400W, 50.6V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,933
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Product details
Overview
SMA4F43AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 43V working stand-off voltage, 48.1–53.1V breakdown voltage at 1mA, and 69.8V clamping voltage at 5.7A peak pulse current; it is AEC-Q101 qualified and used in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F43AH datasheet, SMA4F43AH pinout, SMA4F43AH application, or SMA4F43AH equivalent, key selection criteria include unidirectional polarity, Thin SMA package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and compliance with JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity Level 1.
Technical Context
The SMA4F43AH is a single-die, glass-passivated unidirectional TVS diode optimized for fast transient suppression in automotive-grade power electronics. It delivers 400W non-repetitive peak pulse power (10/1000μs waveform) with a low 0.095%/°C VBR temperature coefficient and operates across –55°C to +175°C junction range.
Its thermal design relies on PCB-mounted 5mm × 5mm copper pad layout per JEDEC standards, achieving RθJA = 62°C/W and RθJC = 16°C/W. The device exhibits 1μA maximum reverse leakage at 43V and 3.5V forward voltage at 25A, confirming robust surge handling without forward conduction interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 48.1–53.1 V - Verified breakdown threshold ensuring precise overvoltage triggering |
| VC @ IPPM=5.7A | 69.8 V - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power rating defining transient energy absorption capability |
| TJ max | +175 °C - Enables operation in under-hood automotive environments without derating |
| RθJL | 20 °C/W - Low junction-to-lead thermal resistance supports reliable heat transfer to PCB |
| IR @ VWM | 1 μA - Minimal leakage preserves system efficiency in standby and low-power modes |
Pinout & Package
Package: Thin SMA - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated molding compound, and cathode band polarity marking. Weight: 0.030 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side of protected circuit; enables unidirectional clamping |
| Cathode (banded end) | Current exit terminal in forward bias; high-impedance node in reverse bias | Connected to higher-potential rail; defines clamping direction and polarity-sensitive protection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive powertrain and chassis applications per stress test requirements |
| Glass passivated junction | Enhanced moisture resistance and long-term stability under thermal cycling and humidity exposure |
| VBR tempco ≤ 0.095%/°C | Minimal drift in trigger voltage across operating temperature range, improving protection consistency |
| J-STD-020 Level 1 MSL | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
| Halogen-free (IEC 61249-2-21) | Meets environmental compliance for RoHS and automotive ELV directives without compromising flame retardancy |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppressing inductive kickback and load dump transients in 48V BLDC motor gate drivers and power stages. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase terminals or DC bus inputs to clamp surges before they reach MOSFETs or controllers. Use Value: Limits clamping voltage to 69.8V at 5.7A, preventing gate oxide damage and maintaining safe SOA margins for 60V-rated power semiconductors. | Use Scenario: Protecting cell monitoring ICs and communication interfaces from ESD and battery disconnect spikes in multi-cell Li-ion packs. IC Role / Device Role / Timing Role: Standoff-rated TVS on analog front-end inputs and CAN/UART lines to absorb ±15kV HBM ESD and 100V load dump events. Use Value: 1μA leakage at 43V ensures minimal impact on precision voltage sensing accuracy and battery state-of-charge calculation. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Safeguarding LED driver ICs and microcontrollers against load dump and jump-start transients in headlamp and DRL modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V/24V input rails upstream of buck controllers and gate drivers. Use Value: 400W peak power rating handles 10/1000μs load dump pulses per ISO 7637-2 Pulse 5a without degradation. | Use Scenario: Input-stage surge protection for industrial and automotive SMPS front-ends exposed to line transients and coupling noise. IC Role / Device Role / Timing Role: Parallel-connected TVS on bulk capacitor input to limit reflected surge voltage into PFC and PWM controller ICs. Use Value: 175°C max junction temperature allows uninterrupted operation during sustained high-ambient conditions in enclosed power enclosures. |
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 SMAJ43A | Same Thin SMA package, 43V VWM, but 400W PPPM and 70.1V VC; slightly higher clamping voltage (+0.3V) | Identical use in automotive and industrial SMPS; validated in ISO 7637-2 testing | Acceptable where <0.5V clamping margin increase is tolerable; same footprint and reflow profile |
| ON Semiconductor SMA6J43A | 600W PPPM, 43V VWM, 70.0V VC; larger thermal mass but identical pinout and polarity | Better suited for high-energy transients (e.g., alternator load dump); requires no layout change | Preferred when future-proofing against higher surge classes; same mounting and soldering process |
Compared with SMA4F43AH, SMAJ43A offers near-identical clamping performance with minor VC variance, while SMA6J43A provides 50% higher surge capacity in the same footprint-enabling design flexibility without PCB revision.
Availability
SMA4F43AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, and switching mode power supplies requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMA4F43AH 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 and industrial markets.
The SMA4FxxAH series was developed specifically for AEC-Q101-compliant transient suppression in space-constrained automotive power systems, emphasizing thermal robustness, low leakage, and repeatable clamping behavior under harsh environmental stress.
FAQ
What is the maximum clamping voltage of the SMA4F43AH under a 10/1000μs surge?
The SMA4F43AH has a maximum clamping voltage (VC) of 69.8 V when subjected to a 10/1000μs waveform at its rated peak pulse current of 5.7 A. This value is measured per JEDEC-standard test conditions and ensures predictable overvoltage limiting for downstream components in the protected circuit. The SMA4F43AH maintains this clamping performance across its full operating temperature range.
Is the SMA4F43AH suitable for automotive applications?
Yes, the SMA4F43AH is AEC-Q101 qualified and designed for automotive use, including BLDC motor control, lighting modules, and battery management systems. Its –55°C to +175°C junction temperature range, JESD201 Class 2 whisker resistance, and compliance with ISO 7637-2 load dump immunity make it suitable for under-hood and chassis-mounted electronics. The SMA4F43AH meets all required stress tests for automotive grade reliability.
What is the polarity configuration of the SMA4F43AH?
The SMA4F43AH is a unidirectional TVS diode, with cathode indicated by a band on the Thin SMA package. In normal operation, it blocks up to 43 V in reverse bias and conducts only during positive transients exceeding its breakdown voltage. This polarity-specific behavior makes the SMA4F43AH appropriate for DC rail protection where surge direction is known and controlled.
Does the SMA4F43AH require moisture sensitivity baking before reflow?
No, the SMA4F43AH is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has unlimited floor life and does not require baking prior to surface-mount reflow. This simplifies manufacturing logistics and eliminates risk of popcorning or delamination during standard lead-free reflow profiles, supporting high-yield automated assembly of the SMA4F43AH.
What is the thermal resistance from junction to ambient for the SMA4F43AH?
The SMA4F43AH has a junction-to-ambient thermal resistance (RθJA) of 62°C/W when mounted on a standard 5 mm × 5 mm copper pad test board, per JEDEC JESD51-3. This value assumes natural convection and defines the steady-state temperature rise above ambient at 7.5 W dissipation. For accurate thermal modeling, designers must replicate the specified pad layout to achieve the published RθJA for the SMA4F43AH.
SMA4F43AH 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):
- 43V
- Voltage - Breakdown (Min):
- 48.1V
- Voltage - Clamping (Max) @ Ipp:
- 69.8V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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
SMA4F43AH FAQ
1.How can I place an order for SMA4F43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F43AH 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 SMA4F43AH reliable?
The price and inventory of SMA4F43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F43AH is usually 5 days.
3.What payment methods are accepted for SMA4F43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F43AH?
SMA4F43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F43AH 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 SMA4F43AH?
For technical support, including SMA4F43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F43AH requirements.
6.How does Aetrix verify that SMA4F43AH is sourced from the original manufacturer or authorized distributors?
All SMA4F43AH 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 SMA4F43AH meets industry standards.
7.What is the process for return or replacement of SMA4F43AH?
All SMA4F43AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F43AH, 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 SMA4F43AH part is unused and in its original packaging.
Return procedure for SMA4F43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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