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Taiwan Semiconductor Corporation SMA4F30AH
- Part No.:
- SMA4F30AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F30AH.pdf
- Description:
- 400W, 35.3V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,158
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Product details
Overview
SMA4F30AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 30V working stand-off voltage, 33.5–37.1V breakdown voltage at 1mA, and 48.7V clamping voltage at 8.2A peak pulse current. It is AEC-Q101 qualified and designed for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F30AH datasheet, SMA4F30AH pinout, SMA4F30AH application, or SMA4F30AH equivalent, key selection criteria include its 400W 10/1000μs peak pulse power rating, 175°C maximum junction temperature, Thin SMA package compatibility with J-STD-002 solderability, and unidirectional polarity for DC rail protection.
Technical Context
The SMA4F30AH operates as a silicon avalanche diode with glass-passivated junction, optimized for fast response to transient surges up to 400W under standardized 10/1000μs waveform conditions. Its thermal design supports operation from −55°C to +175°C with RθJL = 20°C/W and RθJA = 62°C/W on a 5mm × 5mm copper pad PCB.
It features a maximum VBR temperature coefficient of 0.095%/°C and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 requirements, ensuring robustness in automotive reflow environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR @ IT=1mA | 33.5–37.1 V - Confirmed breakdown range defining turn-on threshold under standard test condition |
| VC @ IPPM=8.2A | 48.7 V - Clamped voltage during 10/1000µs surge, limiting downstream component stress |
| PPPM | 400 W - Peak pulse power handling capability per single transient event |
| TJ max | +175 °C - Enables use in under-hood automotive locations without derating |
| RθJL | 20 °C/W - Low junction-to-lead thermal resistance supports high-power pulse dissipation |
Pinout & Package
Package: Thin SMA - Surface-mount plastic package with cathode band marking, UL 94V-0 rated molding compound, matte tin-plated leads, and 0.030g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side of protected DC line (e.g., ground or return path) |
| Cathode | Current exit terminal in forward bias; marked by band | Connected to higher-potential side (e.g., 30V rail); defines unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress |
| Moisture Sensitivity Level 1 | Enables standard SMT assembly without baking or dry-pack requirements |
| Halogen-free construction | Complies with IEC 61249-2-21, supporting RoHS and environmental compliance programs |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback and load dump transients in 24–48V BLDC motor control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase outputs or supply rails to clamp voltage spikes. Use Value: Limits transient voltage to ≤48.7V, protecting gate drivers and MCU I/O from damage during commutation events. | Use Scenario: Guards cell monitoring ICs and communication interfaces against ESD and surge in 12–48V lithium-ion BMS stacks. IC Role / Device Role / Timing Role: Standoff-rated TVS on analog sensing lines and CAN/UART buses to absorb ±8kV contact ESD per IEC 61000-4-2. Use Value: Maintains 30V working voltage margin while clamping to 48.7V, preserving signal integrity during fault conditions. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Protects LED driver ICs and MOSFETs in headlamp and DRL modules subjected to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V/24V input rails upstream of buck controllers. Use Value: Withstands 400W peak pulse energy and operates up to +175°C, matching under-hood thermal demands. | Use Scenario: Safeguards primary-side controllers and secondary-side rectifiers in industrial AC/DC adapters and DC/DC converters. IC Role / Device Role / Timing Role: Input-stage TVS on bulk capacitor rails to absorb line-induced surges and switching noise. Use Value: Delivers 48.7V clamping at 8.2A with <1µA leakage at 30V, minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | Same Thin SMA package; 33.3–36.8V VBR, 48.4V VC @ 8.3A, 400W rating | Identical AEC-Q101 qualification and thermal specs; minor VBR/VC variance (<1%) | Drop-in replacement where board layout and leakage budget allow ±0.3V VBR tolerance |
| SMBJ30A | SMB package (larger footprint); same electrical specs but RθJA = 50°C/W, higher thermal mass | Better steady-state power handling (10W vs. 7.5W), but incompatible with Thin SMA land pattern | Select when thermal derating margin is critical and PCB space permits larger package |
Compared with SMAJ30A and SMBJ30A, the SMA4F30AH offers identical surge performance in the smallest possible SMA footprint, with verified MSL1 handling and halogen-free compliance-making it optimal for space-constrained, high-reliability automotive PCBs where lead-free reflow and zero-bake assembly are required.
Availability
SMA4F30AH is available at Aetrix Electronics and suitable for BLDC motor drives, battery management systems, automotive lighting control, and switching mode power supplies requiring stable component supply across extended production lifecycles.
Supply support for SMA4F30AH 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, and rectifiers for automotive and industrial markets.
The SMA4FxxAH series was developed specifically to meet AEC-Q101 requirements for unidirectional transient suppression in compact, high-temperature automotive subsystems-emphasizing reliability, low leakage, and consistent clamping performance.
FAQ
What is the maximum clamping voltage of the SMA4F30AH under standard test conditions?
The SMA4F30AH has a maximum clamping voltage (VC) of 48.7 V when subjected to an 8.2 A peak pulse current with a 10/1000 µs waveform. This value is measured at TA = 25°C and ensures predictable overvoltage limiting for downstream components in the SMA4F30AH-protected circuit.
Is the SMA4F30AH suitable for automotive applications?
Yes, the SMA4F30AH is AEC-Q101 qualified and designed for automotive use. It supports operating temperatures from −55°C to +175°C, passes JESD201 Class 2 whisker testing, and meets moisture sensitivity level 1-making it appropriate for engine control units, body electronics, and BLDC motor modules where the SMA4F30AH provides certified surge immunity.
What is the polarity configuration of the SMA4F30AH?
The SMA4F30AH is a unidirectional TVS diode, with polarity indicated by a cathode band on the package. In circuit operation, it conducts only when the cathode is at a higher potential than the anode-enabling precise DC rail protection without reverse conduction leakage, a key behavior confirmed in the SMA4F30AH's electrical specifications table.
Does the SMA4F30AH require special PCB layout considerations?
Yes-the SMA4F30AH uses the Thin SMA package and requires adherence to the manufacturer's suggested pad layout for optimal thermal performance and solder joint reliability. Its RθJA = 62°C/W is specified on a 5 mm × 5 mm copper pad; deviating from this layout may reduce surge current handling or increase junction temperature beyond the SMA4F30AH's 175°C limit.
How does the SMA4F30AH compare to the SMAJ30A in terms of surge performance?
The SMA4F30AH and SMAJ30A deliver nearly identical surge performance: both offer 400W peak pulse power, ~33–37V breakdown, and ~48–49V clamping. The SMA4F30AH adds halogen-free construction and tighter VBR tolerance (±5.3% vs. ±5.0%), while maintaining full compatibility with SMAJ30A's footprint-making the SMA4F30AH a direct upgrade path in new designs requiring enhanced environmental compliance.
SMA4F30AH 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):
- 30V
- Voltage - Breakdown (Min):
- 33.5V
- Voltage - Clamping (Max) @ Ipp:
- 48.7V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- 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
SMA4F30AH FAQ
1.How can I place an order for SMA4F30AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F30AH 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 SMA4F30AH reliable?
The price and inventory of SMA4F30AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F30AH is usually 5 days.
3.What payment methods are accepted for SMA4F30AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F30AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F30AH?
SMA4F30AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F30AH 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 SMA4F30AH?
For technical support, including SMA4F30AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F30AH requirements.
6.How does Aetrix verify that SMA4F30AH is sourced from the original manufacturer or authorized distributors?
All SMA4F30AH 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 SMA4F30AH meets industry standards.
7.What is the process for return or replacement of SMA4F30AH?
All SMA4F30AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F30AH, 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 SMA4F30AH part is unused and in its original packaging.
Return procedure for SMA4F30AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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