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Taiwan Semiconductor Corporation SMA4F22AH
- Part No.:
- SMA4F22AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F22AH.pdf
- Description:
- 400W, 25.9V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
SMA4F22AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 22V working stand-off voltage, 24.6–27.2V breakdown range at 1mA, and 35.7V clamping voltage at 11.2A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F22AH datasheet, SMA4F22AH pinout, SMA4F22AH application, or SMA4F22AH equivalent, key selection criteria include unidirectional polarity, Thin SMA package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging glass-passivated silicon junction technology to deliver fast response (<1 ns) to transient surges. Its 10/1000μs waveform rating supports 400W non-repetitive peak pulse power dissipation with defined derating above 25°C ambient.
Thermal design relies on low RθJL (20°C/W) and RθJC (16°C/W) values, validated on a 5mm × 5mm copper pad PCB layout. The device exhibits a VBR temperature coefficient of 0.095%/°C and meets JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR @ IT=1mA | 24.6–27.2 V - Verified breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=11.2A | 35.7 V - Clamped voltage limiting downstream circuit stress under 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 |
| Polarity | Unidirectional - Provides reverse-biased surge suppression only; requires correct orientation in PCB layout |
Pinout & Package
Package: Thin SMA - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated molding compound, and cathode band marking. Dimensions conform to standard Thin SMA outline (length: 4.57 mm, width: 2.79 mm, height: 2.10 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-blocking terminal | Connected to protected line (e.g., 22V rail); cathode band identifies this terminal on package |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| RθJL = 20°C/W | Enables efficient heat transfer to PCB copper, supporting sustained 7.5W steady-state dissipation |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or bake-out prior to reflow soldering |
| 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 24V BLDC gate driver circuits. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase lines or supply rails to clamp spikes below MOSFET VDSS rating. Use Value: Limits clamping voltage to 35.7V at 11.2A, preventing gate oxide damage and ensuring ISO 7637-2 Pulse 5a compliance. | Use Scenario: Protects cell monitoring ICs and communication interfaces from ESD and surge events in 24V lithium-ion packs. IC Role / Device Role / Timing Role: Standoff-rated TVS on analog sensing inputs and CAN bus lines to maintain signal integrity during fault conditions. Use Value: 22V VWM allows operation across full BMS operating range while blocking leakage below 1 µA. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Shields LED driver ICs from load-dump and jump-start transients in headlamp modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24V input rail upstream of DC-DC converter stage. Use Value: 400W PPPM rating handles 12V/24V system load-dump pulses without degradation. | Use Scenario: Safeguards primary-side controller ICs and MOSFETs against switching-induced voltage spikes in industrial SMPS. IC Role / Device Role / Timing Role: Input-stage TVS on bulk capacitor rail to absorb reflected energy from transformer leakage inductance. Use Value: 35.7V clamping ensures MOSFET VDSS margin remains >20% at rated 22V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Same Thin SMA package; 22V VWM, but lower PPPM (400W same), higher VC (35.5V vs. 35.7V), no AEC-Q101 claim | Industrial-grade only; not qualified for automotive under-hood use | Select SMAJ22A only if AEC-Q101 is not required and cost is prioritized |
| SMBJ22A | Larger SMB package; identical electrical specs but higher RθJA (50°C/W vs. 62°C/W), lower thermal efficiency on same PCB | Acceptable where board space permits larger footprint and thermal margin is less constrained | Choose SMBJ22A when existing layout uses SMB pads or higher steady-state power derating is needed |
Compared with SMAJ22A and SMBJ22A, the SMA4F22AH delivers AEC-Q101 validation and optimized thermal resistance in Thin SMA, making it preferred for space-constrained automotive modules requiring guaranteed reliability at 175°C junction temperature.
Availability
SMA4F22AH 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 production lifecycles.
Supply support for SMA4F22AH 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 industrial and automotive markets.
The SMA4FxxAH series was designed specifically to meet AEC-Q101 requirements for unidirectional transient suppression in 12V–60V automotive subsystems, emphasizing thermal robustness and high-reliability packaging.
FAQ
What is the maximum clamping voltage of the SMA4F22AH under a 10/1000µs surge?
The SMA4F22AH has a maximum clamping voltage (VC) of 35.7 V when subjected to its rated peak pulse current of 11.2 A with a 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream components remain within safe voltage limits during transient events. The SMA4F22AH maintains this clamping performance across its specified operating temperature range.
Is the SMA4F22AH suitable for automotive applications?
Yes, the SMA4F22AH is AEC-Q101 qualified and explicitly designed for automotive use, including under-hood environments. Its 175°C maximum junction temperature, glass-passivated junction, and moisture sensitivity level 1 rating support reliable operation in demanding automotive subsystems such as BLDC motor controllers and lighting modules. The SMA4F22AH meets critical automotive reliability and process requirements.
What is the polarity configuration of the SMA4F22AH?
The SMA4F22AH is a unidirectional TVS diode, meaning it conducts only in reverse bias above its breakdown voltage and blocks current in forward bias up to 3.5 V at 25 A. The cathode is marked by a band on the Thin SMA package, and correct orientation is essential for proper surge protection. This configuration differs from bidirectional variants that protect both polarities.
How does the thermal performance of the SMA4F22AH compare to standard SMA packages?
The SMA4F22AH uses a Thin SMA package with improved thermal metrics: RθJL = 20°C/W and RθJC = 16°C/W, measured on a 5 mm × 5 mm copper pad PCB. These values represent a meaningful improvement over legacy SMA packages, enabling higher steady-state power dissipation (7.5 W) and better transient thermal response. The SMA4F22AH's thermal design supports compact, high-density automotive layouts.
What is the marking code for the SMA4F22AH on the device body?
The SMA4F22AH is marked with the code "4F022" on its package body, followed by date and factory codes. This marking aligns with Taiwan Semiconductor's standardized coding scheme for the SMA4FxxAH family and enables quick visual identification on assembled PCBs. The cathode band is located adjacent to the marking area and must be oriented toward the protected line during placement.
SMA4F22AH 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):
- 22V
- Voltage - Breakdown (Min):
- 24.6V
- Voltage - Clamping (Max) @ Ipp:
- 35.7V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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
SMA4F22AH FAQ
1.How can I place an order for SMA4F22AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F22AH 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 SMA4F22AH reliable?
The price and inventory of SMA4F22AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F22AH is usually 5 days.
3.What payment methods are accepted for SMA4F22AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F22AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F22AH?
SMA4F22AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F22AH 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 SMA4F22AH?
For technical support, including SMA4F22AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F22AH requirements.
6.How does Aetrix verify that SMA4F22AH is sourced from the original manufacturer or authorized distributors?
All SMA4F22AH 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 SMA4F22AH meets industry standards.
7.What is the process for return or replacement of SMA4F22AH?
All SMA4F22AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F22AH, 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 SMA4F22AH part is unused and in its original packaging.
Return procedure for SMA4F22AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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