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Vishay General Semiconductor - Diodes Division TA6F18AHM3/6B
- Part No.:
- TA6F18AHM3/6B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
TA6F18AHM3/6B.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO221AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,180
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Product details
Overview
TA6F18AHM3/6B from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for clamping inductive switching surges and ESD transients on power/signal lines. It features a 17.1–18.9 V breakdown voltage (VBR), 15.3 V standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), 25.5 V maximum clamping voltage at 23.5 A, and AEC-Q101 qualification - deployed in automotive sensor signal protection and industrial I/O interface circuits.
For engineers reviewing the TA6F18AHM3/6B datasheet, TA6F18AHM3/6B pinout, TA6F18AHM3/6B application, or TA6F18AHM3/6B equivalent, key selection criteria include unidirectional polarity, DO-221AC (SlimSMA) package compatibility, 185 °C junction rating, IEC 61000-4-2 Level 4 ESD immunity (15 kV air / 8 kV contact), and thermal resistance (RθJA = 145 °C/W).
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream circuitry, activating only when reverse voltage exceeds VWM (15.3 V) and fully clamping at ≤25.5 V under 23.5 A surge current. Its passivated anisotropic rectifier structure ensures stable leakage (<1 µA at VWM, TJ = 150 °C) and robustness across -65 °C to +185 °C operating range.
The DO-221AC (SlimSMA) package enables automated placement with 0.95 mm profile height and meets MSL Level 1 (260 °C reflow peak). Thermal design relies on low RθJM (20 °C/W) to sustain 6 W power dissipation at TM = 65 °C on infinite heatsink, while derating applies above ambient 25 °C per Fig. 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 17.1–18.9 V at 1.0 mA - defines precise activation threshold for overvoltage triggering |
| Standoff Voltage VWM | 15.3 V - maximum continuous reverse voltage before leakage exceeds 1 µA |
| Clamping Voltage VC | 25.5 V at 23.5 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power | 600 W (10/1000 µs) - sustains high-energy transients without failure |
| Junction Temperature Range | -65 °C to +185 °C - supports under-hood automotive and high-temp industrial environments |
| ESD Immunity | IEC 61000-4-2 Level 4: 15 kV (air), 8 kV (contact) - protects against human-body model discharges |
| Package | DO-221AC (SlimSMA) - ultra-low-profile (0.95 mm height), halogen-free, RoHS-compliant, AEC-Q101 qualified |
Pinout & Package
DO-221AC (SlimSMA) package: cathode-indicating band on top surface; two-terminal SMD device with matte tin-plated leads solderable per J-STD-002/JESD22-B102; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to system ground or low-side reference | Provides return path for clamped surge current; must be routed with low-inductance ground plane |
| Cathode | Protected line connection; marked by color band | Connected to line being protected (e.g., sensor supply or CAN signal); reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| 185 °C junction rating | Enables reliable operation in engine control units and powertrain modules where ambient exceeds 125 °C |
| Passivated anisotropic rectifier technology | Delivers stable VBR tolerance and <1 µA leakage at 150 °C, critical for battery-powered sensor nodes |
| MSL Level 1 moisture sensitivity | Allows direct placement without baking; compatible with standard 260 °C lead-free reflow profiles |
| 600 W peak pulse capability | Withstands ISO 7637-2 Pulse 1/2a/3a transients and load-dump surges in 12 V automotive systems |
| Uni-directional configuration | Optimized for DC-biased lines (e.g., 5 V/12 V supplies), avoiding unnecessary capacitance on AC-coupled signals |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of temperature/pressure sensors in engine bay modules exposed to inductive kickback and alternator ripple. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point, shunting transients before reaching ADC input or op-amp buffer. Use Value: Prevents latch-up or permanent damage to precision signal conditioning ICs while maintaining <1 µA leakage at 15.3 V standoff. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) backplanes subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact inputs, coordinated with upstream fuse and series resistor for energy limiting. Use Value: Clamps 23.5 A surge to ≤25.5 V within nanoseconds, preserving optocoupler isolation integrity and preventing false triggering. |
| Telecom Power Rail Protection | Consumer USB Port ESD Suppression |
|
Use Scenario: Guarding 48 V PoE (Power over Ethernet) midspan injector outputs against lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Unidirectional TVS on DC feed line, selected for high VBR margin above nominal 57 V max PoE voltage. Use Value: Withstands 600 W pulses without degradation, ensuring >100,000 surge cycles in outdoor telecom cabinets. |
Use Scenario: Secondary-level ESD protection on VBUS line of USB 2.0 host ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response clamping device downstream of primary polymer PTC, activated after 15 kV air discharge event. Use Value: Limits VBUS overshoot to 25.5 V during IEC 61000-4-2 contact discharge, preventing USB PHY latch-up or VBUS regulator shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same DO-214AC package but lower 185 °C rating not specified; VBR = 20–22.1 V; 600 W rating at 25 °C only | Lacks AEC-Q101 qualification and 185 °C guaranteed operation; suitable for commercial-grade designs only | Select SMAJ18A only if automotive qualification and extended temperature reliability are not required |
| SMCJ18A | DO-214AB package (larger footprint); higher 1500 W rating; same VBR range; RθJA = 18 °C/W (lower thermal resistance) | Requires PCB area increase (~3× footprint); better for high-power industrial surge scenarios but incompatible with SlimSMA layout | Choose SMCJ18A when board space permits and >600 W surge handling is needed, not for space-constrained automotive modules |
Compared with SMAJ18A and SMCJ18A, TA6F18AHM3/6B uniquely combines AEC-Q101 qualification, 185 °C operation, DO-221AC ultra-low profile, and guaranteed 600 W performance across full temperature range - making it the only option for next-generation automotive sensor nodes requiring zero-layout-change upgrades.
Availability
TA6F18AHM3/6B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom power rail safeguarding requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for TA6F18AHM3/6B 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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The TA6F series belongs to Vishay's PAR® (Protection and Regulation) transient voltage suppressor family, engineered specifically for high-temperature, high-reliability protection in automotive ECUs and harsh-environment industrial controls.
FAQ
What is the exact breakdown voltage range for TA6F18AHM3/6B?
The TA6F18AHM3/6B has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1.0 mA test current, measured per the Vishay datasheet Document Number 89939. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage margining in safety-critical automotive designs where TA6F18AHM3/6B is deployed.
Is TA6F18AHM3/6B suitable for 24 V industrial control systems?
Yes, TA6F18AHM3/6B is suitable for 24 V industrial control systems: its 15.3 V standoff voltage provides adequate margin above 24 V nominal rails (including ripple), and its 25.5 V clamping voltage at 23.5 A prevents damage to downstream 30 V-rated components. The device's -65 °C to +185 °C rating and AEC-Q101 qualification further validate its use in factory-floor PLC I/O modules where TA6F18AHM3/6B is commonly applied.
Does TA6F18AHM3/6B meet automotive qualification standards?
Yes, TA6F18AHM3/6B is explicitly AEC-Q101 qualified per the Vishay datasheet, confirming its suitability for automotive applications including engine control, body electronics, and ADAS sensor interfaces. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD - all validated for the DO-221AC package variant used in TA6F18AHM3/6B.
What is the thermal resistance of TA6F18AHM3/6B, and how does it affect PCB layout?
TA6F18AHM3/6B has a typical junction-to-ambient thermal resistance (RθJA) of 145 °C/W on FR-4 with minimum recommended pad layout, and 20 °C/W junction-to-mount (RθJM). This means PCB layout must follow Vishay's DO-221AC mounting pad dimensions (Document 89939, page 4) to achieve rated 6 W power dissipation at 65 °C - undersized copper pours will cause premature thermal shutdown during repeated surges.
How does the DO-221AC (SlimSMA) package of TA6F18AHM3/6B differ from standard SMA?
The DO-221AC (SlimSMA) package of TA6F18AHM3/6B is 30% lower in height (0.95 mm vs. ~1.3 mm) and features tighter dimensional tolerances than standard SMA (DO-214AC), enabling higher-density layouts in space-constrained modules. Its optimized thermal path and matte tin plating also ensure compatibility with lead-free reflow and JESD22-B102 solderability - key advantages confirmed for TA6F18AHM3/6B in Vishay's mechanical data.
TA6F18AHM3/6B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- PAR®
- 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)
TA6F18AHM3/6B FAQ
1.How can I place an order for TA6F18AHM3/6B through Aetrix?
Please submit a Request for Quotation (RFQ) for TA6F18AHM3/6B 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 TA6F18AHM3/6B reliable?
The price and inventory of TA6F18AHM3/6B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TA6F18AHM3/6B is usually 5 days.
3.What payment methods are accepted for TA6F18AHM3/6B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TA6F18AHM3/6B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TA6F18AHM3/6B?
TA6F18AHM3/6B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TA6F18AHM3/6B 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 TA6F18AHM3/6B?
For technical support, including TA6F18AHM3/6B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TA6F18AHM3/6B requirements.
6.How does Aetrix verify that TA6F18AHM3/6B is sourced from the original manufacturer or authorized distributors?
All TA6F18AHM3/6B 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 TA6F18AHM3/6B meets industry standards.
7.What is the process for return or replacement of TA6F18AHM3/6B?
All TA6F18AHM3/6B units undergo pre-shipment inspection (PSI). If there is an issue with TA6F18AHM3/6B, 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 TA6F18AHM3/6B part is unused and in its original packaging.
Return procedure for TA6F18AHM3/6B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TA6F18AHM3/6B Tags
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