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Vishay General Semiconductor - Diodes Division TA6F18AHM3/6A
- Part No.:
- TA6F18AHM3/6A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
TA6F18AHM3/6A.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO221AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,539
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Product details
Overview
TA6F18AHM3/6A from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for clamping inductive switching transients and ESD events on power rails and signal lines. It features a breakdown voltage of 17.1–18.9 V at 1 mA, clamps to ≤25.5 V at 23.5 A (10/1000 μs), delivers 600 W peak pulse power, operates up to +185 °C junction temperature, and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the TA6F18AHM3/6A datasheet, TA6F18AHM3/6A pinout, TA6F18AHM3/6A application, or TA6F18AHM3/6A equivalent, key selection criteria include unidirectional clamping behavior, DO-221AC (SlimSMA) package compatibility with automated placement, 15 kV air/8 kV contact ESD immunity per IEC 61000-4-2 Level 4, and thermal resistance (RθJA = 145 °C/W) under standard FR-4 mounting.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve stable clamping performance across -65 °C to +185 °C operating range, with junction passivation optimized for high-reliability environments. Its unidirectional architecture provides low-leakage reverse standoff (VWM = 15.3 V) and sharp avalanche turn-on at VBR = 17.1–18.9 V.
The device is rated for 600 W peak pulse power (10/1000 μs), supports 23.5 A maximum peak surge current, and maintains clamping voltage ≤25.5 V under full-rated surge. Thermal design is enabled by RθJM = 20 °C/W (junction-to-mount) and MSL Level 1 moisture sensitivity rating with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines precise avalanche initiation threshold for predictable overvoltage clamping |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1 μA at 150 °C |
| VC @ IPPM | ≤25.5 V at 23.5 A (10/1000 μs) - ensures protected circuitry remains below safe voltage limits during surge |
| PPPM | 600 W - enables robust suppression of inductive kickback and lightning-induced transients |
| TJ max | +185 °C - supports operation in under-hood automotive, industrial motor drives, and high-ambient environments |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - protects against human-body-model electrostatic discharge |
| Package | DO-221AC (SlimSMA) - 0.95 mm profile enables ultra-thin PCB designs and automated SMT placement |
Pinout & Package
DO-221AC (SlimSMA) package: cathode-indicating band on top surface; anode and cathode terminals formed by molded leads extending from opposite ends of the rectangular body; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Provides return path during clamping; must be routed with low-inductance connection to minimize voltage overshoot |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., 12 V rail or sensor output) | Accepts transient energy and shunts it to ground; polarity marked by visible color band per JEDEC DO-221AC standard |
Key Features
| Feature | Design Value |
|---|---|
| Uni-directional clamping | Enables integration on DC power rails without interfering with normal forward conduction; avoids false triggering on positive transients only |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units, ADAS sensors, and infotainment power supplies |
| 145 °C/W junction-to-ambient thermal resistance | Supports thermal design on standard FR-4 with minimum recommended pad layout; derates linearly above 25 °C ambient |
| MSL Level 1, 260 °C peak reflow | Permits single-pass lead-free reflow assembly without preconditioning or dry-pack requirements |
| 0.95 mm typical height | Reduces board stack height in space-constrained modules such as telematics units and compact ECUs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients exceeding 15.3 V while maintaining low leakage during normal operation. Use Value: Prevents latch-up or permanent damage to downstream LDOs and MCUs by limiting clamped voltage to ≤25.5 V during 600 W surges. |
Use Scenario: Safeguarding analog outputs of pressure or temperature sensors in factory automation systems exposed to relay coil switching noise. IC Role / Device Role / Timing Role: TVS mounted directly at sensor connector to suppress fast-rising transients (<10 ns rise time) before they couple into precision ADC front-ends. Use Value: Maintains signal integrity by limiting induced voltage spikes to <25.5 V, preserving measurement accuracy and preventing false triggers in PLC input stages. |
| Telecom DC Power Input Protection | Consumer USB Power Delivery Line Protection |
Use Scenario: Shielding PoE-powered network switches from surges on 48 V DC input derived from midspan injectors or endspans. IC Role / Device Role / Timing Role: Primary clamping device on main DC bus, coordinated with upstream fuse and downstream filtering capacitors. Use Value: Absorbs 600 W transients without degradation, enabling compliance with IEC 61000-4-5 Level 4 surge immunity testing. |
Use Scenario: Adding secondary overvoltage protection on VBUS lines of USB-C ports in portable monitors and docking stations. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to USB controller IC to suppress ESD and hot-swap transients before reaching PHY interface. Use Value: Delivers 15 kV air-gap ESD immunity per IEC 61000-4-2 Level 4, meeting USB-IF compliance requirements for host port robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same DO-214AC package; lower PPPM = 400 W; VC = 29.2 V @ 13.7 A; not AEC-Q101 qualified | Limited to commercial-grade consumer/industrial use; unsuitable for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and higher surge margin is unnecessary |
| 1.5SMC18A | DO-214AB package; larger footprint (2.79 mm height); PPPM = 1500 W; VC = 29.2 V @ 51.3 A; AEC-Q101 qualified | Requires more PCB area; better suited for high-energy surges but less optimal for space-constrained layouts | Choose when surge energy exceeds 600 W capability and board real estate permits larger package |
Compared with SMAJ18A and 1.5SMC18A, TA6F18AHM3/6A uniquely balances AEC-Q101 qualification, ultra-low 0.95 mm profile, and 600 W surge capacity in the DO-221AC footprint-making it optimal for automotive and compact industrial modules where height and reliability are co-constrained.
Availability
TA6F18AHM3/6A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power inputs, and consumer USB PD protection requiring stable component supply and long-term lifecycle support.
Supply support for TA6F18AHM3/6A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-grade solutions.
The TA6F series belongs to Vishay's PAR® family of high-temperature TVS diodes, engineered specifically for robust transient suppression in automotive power systems, industrial controls, and harsh-environment electronics where junction temperatures exceed 150 °C.
FAQ
What is the maximum clamping voltage of the TA6F18AHM3/6A under full-rated surge conditions?
The TA6F18AHM3/6A clamps to a maximum of 25.5 V when subjected to its rated peak pulse current of 23.5 A with a 10/1000 μs waveform. This value is measured per standard test conditions defined in the Vishay datasheet document 89939 and reflects worst-case performance at TA = 25 °C. The TA6F18AHM3/6A maintains this clamping performance across its full operating temperature range, supporting reliable protection in demanding environments.
Is the TA6F18AHM3/6A suitable for automotive applications?
Yes, the TA6F18AHM3/6A is AEC-Q101 qualified and rated for junction temperatures up to +185 °C, making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor power rails. Its DO-221AC package supports automated placement in high-volume automotive manufacturing, and its 15 kV air/8 kV contact ESD rating meets stringent vehicle-level EMC requirements. The TA6F18AHM3/6A is explicitly listed in Vishay's automotive-grade product portfolio.
What does the "HM3/6A" suffix indicate in TA6F18AHM3/6A?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. The "/6A" indicates packaging in 7-inch plastic tape-and-reel format with 3500 units per reel. This ordering code aligns with Vishay's standardized packaging nomenclature in document 89939 and ensures compatibility with standard SMT pick-and-place equipment using industry-standard reel dimensions and orientation.
How does the thermal performance of TA6F18AHM3/6A compare to standard SMA packages?
The TA6F18AHM3/6A uses the DO-221AC (SlimSMA) package, which achieves RθJA = 145 °C/W on FR-4 with minimum pad layout-comparable to traditional DO-214AC but in a 0.95 mm profile. Its RθJM = 20 °C/W enables efficient heat transfer to the PCB copper, outperforming many legacy SMA variants in thermally constrained layouts. The TA6F18AHM3/6A sustains full power derating up to +125 °C ambient, verified per Figure 5 in the Vishay datasheet.
Can TA6F18AHM3/6A replace bidirectional TVS diodes in existing designs?
No-TA6F18AHM3/6A is unidirectional only and must not be substituted for bidirectional TVS diodes without circuit review. It conducts only during positive transients relative to ground and offers no protection against negative-going surges. Replacing a bidirectional device with TA6F18AHM3/6A would leave the protected line vulnerable to reverse-polarity events. Designers must verify polarity alignment and transient directionality before implementing the TA6F18AHM3/6A in any application.
TA6F18AHM3/6A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- *
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 23.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-221AC (SlimSMA)
TA6F18AHM3/6A FAQ
1.How can I place an order for TA6F18AHM3/6A through Aetrix?
Please submit a Request for Quotation (RFQ) for TA6F18AHM3/6A 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 TA6F18AHM3/6A reliable?
The price and inventory of TA6F18AHM3/6A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TA6F18AHM3/6A is usually 5 days.
3.What payment methods are accepted for TA6F18AHM3/6A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TA6F18AHM3/6A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TA6F18AHM3/6A?
TA6F18AHM3/6A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TA6F18AHM3/6A 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 TA6F18AHM3/6A?
For technical support, including TA6F18AHM3/6A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TA6F18AHM3/6A requirements.
6.How does Aetrix verify that TA6F18AHM3/6A is sourced from the original manufacturer or authorized distributors?
All TA6F18AHM3/6A 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 TA6F18AHM3/6A meets industry standards.
7.What is the process for return or replacement of TA6F18AHM3/6A?
All TA6F18AHM3/6A units undergo pre-shipment inspection (PSI). If there is an issue with TA6F18AHM3/6A, 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 TA6F18AHM3/6A part is unused and in its original packaging.
Return procedure for TA6F18AHM3/6A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TA6F18AHM3/6A Tags
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