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Vishay General Semiconductor - Diodes Division T4F18AHM3/H
- Part No.:
- T4F18AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F18AHM3/H.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:21,080
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Product details
Overview
T4F18AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in the eSMP® Series, designed for clamping inductive switching transients and lightning-induced surges. It features 18.0 V nominal breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), 400 W peak pulse power (10/1000 µs), 25.5 V maximum clamping voltage at 15.9 A, and AEC-Q101 qualification for automotive sensor line protection.
For engineers reviewing the T4F18AHM3/H datasheet, T4F18AHM3/H pinout, T4F18AHM3/H application, or T4F18AHM3/H equivalent, key selection criteria include its 185 °C junction temperature rating, SMF (DO-219AB) package compatibility, unidirectional polarity, low leakage (<1 µA at VWM), and thermal resistance (RthJA = 135–160 °C/W) under JEDEC 51-2A conditions.
Technical Context
The T4F18AHM3/H employs passivated anisotropic rectifier technology with junction passivation optimized for high-reliability operation. Its unidirectional architecture provides precise reverse-biased clamping without forward conduction during normal operation.
Rated for 400 W peak pulse power per 10/1000 µs waveform and capable of withstanding surge currents up to 15.9 A, it delivers stable clamping performance across -65 °C to +185 °C operating junction temperature range while maintaining <1 µA reverse leakage at VWM and 20 µA at elevated temperature (TJ = 150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 18.0 V - Ensures reliable triggering above 15.3 V system stand-off voltage, minimizing false clamping during normal operation. |
| VC @ IPPM | 25.5 V - Limits transient voltage seen by protected IC/MOSFET to safe level during 15.9 A surge event. |
| PPPM | 400 W - Sustains high-energy transients common in automotive load-dump and inductive switch-off events. |
| TJ max. | +185 °C - Enables deployment in under-hood automotive environments and high-power industrial PCBs without derating. |
| Package | SMF (DO-219AB) - Low-profile, wave/reflow solderable package with JEDEC-compliant footprint and MSL Level 1 rating. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics, including temperature cycling and HTRB. |
Pinout & Package
Package: SMF (DO-219AB) - Surface-mount, low-profile case with matte tin-plated leads, UL 94 V-0 molding compound, and cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected circuit ground or low-side reference; enables unidirectional reverse-biased clamping action. |
| Cathode | Current exit terminal during clamping | Connected to protected signal/power line; color band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design improves long-term reliability under high-temperature bias stress (TJ = 185 °C). |
| Clamping ratio (VC/VBR) | 1.42 - Tight ratio ensures minimal overvoltage margin between trigger and clamp, protecting sensitive 12 V–24 V automotive ICs. |
| Thermal resistance (RthJM) | 15–18 °C/W - Enables efficient heat transfer to PCB copper pads, supporting sustained power dissipation in compact layouts. |
| MSL Level 1 | Reflow-compatible up to 260 °C peak - Eliminates moisture sensitivity concerns and pre-bake requirements in standard SMT lines. |
Applications
| Automotive Sensor Protection | Power Supply Input Clamping |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from ISO 7637-2 pulse 1/2a/5a transients in engine control units. IC Role / Device Role: Unidirectional TVS diode placed between signal line and ground, triggered only during negative-going transients. Use Value: Clamps induced surges to ≤25.5 V while maintaining <1 µA leakage at 15.3 V nominal supply, preserving signal integrity and ADC accuracy. |
Use Scenario: Safeguarding 12 V/24 V DC input rails of infotainment head units and body control modules against load dump and jump-start spikes. IC Role / Device Role: Primary front-end transient suppressor on main power rail, coordinated with upstream fuse and downstream LDO. Use Value: Absorbs 400 W pulses without degradation, enabling compliance with ISO 16750-2 Category C5 (load dump) testing at 185 °C ambient. |
| Industrial Motor Drive Feedback Lines | Automotive Lighting Control |
|
Use Scenario: Shielding encoder quadrature signals and current-sense amplifier inputs from commutation noise and EFT bursts in BLDC motor controllers. IC Role / Device Role: Point-of-use TVS on differential feedback traces, mounted adjacent to connector or IC pin. Use Value: Low capacitance (typ. <100 pF at 0 V) avoids signal edge distortion; 185 °C rating supports placement near heatsinks or power stages. |
Use Scenario: Protecting LED driver ICs and PWM dimming inputs in adaptive front lighting systems (AFS) exposed to battery reversal and alternator ripple. IC Role / Device Role: Reverse-polarity and surge protection element on low-voltage control logic lines (e.g., LIN, PWM enable). Use Value: Withstands repeated 10/1000 µs surges up to 15.9 A while maintaining <20 µA leakage at 150 °C junction, ensuring long-term optical stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same VBR (18 V), but lower PPPM (400 W same), higher VC (29.2 V), larger SMA package (DO-214AC), RthJA ≈ 190 °C/W. | Larger footprint; less suitable for ultra-compact automotive modules requiring DO-219AB's 2.9 mm × 1.3 mm outline. | Select SMAJ18A only when board space allows larger package and higher clamping voltage is acceptable. |
| 1.5SMC18A | Same VBR, higher PPPM (1500 W), much larger SMC package (DO-214AB), VC = 29.2 V, RthJA ≈ 120 °C/W but requires >10× PCB area. | Designed for bulk power rail protection, not signal-line or space-constrained sensor nodes. | Choose 1.5SMC18A only for primary DC input protection where surge energy exceeds 400 W capability. |
Compared with SMAJ18A and 1.5SMC18A, the T4F18AHM3/H delivers identical 18 V clamping threshold in a 40% smaller footprint than SMA and 75% smaller than SMC, with superior thermal resistance to mounting pad (RthJM = 15–18 °C/W) and guaranteed AEC-Q101 qualification-making it optimal for next-gen automotive sensor nodes and compact industrial controls.
Availability
T4F18AHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, power supply input clamping, and industrial motor drive feedback line protection requiring stable component supply, AEC-Q101 compliance, and high-temperature operational continuity.
Supply support for T4F18AHM3/H 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 T4F18AHM3/H belongs to Vishay's eSMP® PAR® TVS family, engineered specifically for AEC-Q101-compliant transient suppression in space-constrained, high-temperature automotive subsystems such as ADAS sensors and body electronics.
FAQ
What is the maximum clamping voltage of the T4F18AHM3/H at its rated peak pulse current?
The T4F18AHM3/H has a maximum clamping voltage (VC) of 25.5 V at its rated peak pulse current (IPPM) of 15.9 A, measured using a 10/1000 µs waveform. This value ensures protected circuits remain within safe voltage limits during standardized surge events. The T4F18AHM3/H maintains this clamping performance across its full operating temperature range, making it suitable for under-hood automotive applications where thermal stability is critical.
Is the T4F18AHM3/H qualified for automotive use, and what standards does it meet?
Yes, the T4F18AHM3/H is AEC-Q101 qualified, meeting rigorous stress testing requirements for automotive electronics including high-temperature reverse bias (HTRB), temperature cycling, and humidity testing. It also complies with MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. These qualifications confirm the T4F18AHM3/H is suitable for deployment in safety-critical automotive subsystems such as engine control, ADAS sensors, and lighting modules.
What package type does the T4F18AHM3/H use, and how does it compare to standard SOD-123W?
The T4F18AHM3/H uses the SMF (DO-219AB) package, which is physically compatible with SOD-123W footprints but offers enhanced thermal performance and higher surge capability. While both packages share similar outline dimensions, the SMF variant features optimized internal construction for 185 °C operation and lower thermal resistance (RthJM = 15–18 °C/W). The T4F18AHM3/H's HM3 suffix confirms halogen-free, RoHS-compliant, and whisker-resistant construction per JESD 201 Class 2.
Does the T4F18AHM3/H have bidirectional or unidirectional polarity?
The T4F18AHM3/H is unidirectional only, with polarity clearly marked by a cathode band. It conducts only during reverse-biased overvoltage events, providing precise clamping on positive-rail signal or power lines referenced to ground. This architecture minimizes leakage and avoids forward conduction during normal operation-unlike bidirectional TVS devices, the T4F18AHM3/H is not intended for AC line or differential signal protection without external biasing.
What is the reverse leakage current specification for the T4F18AHM3/H at maximum operating temperature?
At VWM = 15.3 V and TJ = 150 °C, the T4F18AHM3/H exhibits a maximum reverse leakage current (ID) of 20 µA. At room temperature (25 °C), leakage is limited to 1.0 µA, ensuring minimal power loss and signal interference in always-on automotive modules. This low-leakage behavior is maintained across the full -65 °C to +185 °C junction temperature range, supporting reliable operation in extreme environmental conditions.
T4F18AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 15.9A
- Power - Peak Pulse:
- 400W
- 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-219AB (SMF)
T4F18AHM3/H FAQ
1.How can I place an order for T4F18AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F18AHM3/H 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 T4F18AHM3/H reliable?
The price and inventory of T4F18AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F18AHM3/H is usually 5 days.
3.What payment methods are accepted for T4F18AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F18AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F18AHM3/H?
T4F18AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F18AHM3/H 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 T4F18AHM3/H?
For technical support, including T4F18AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F18AHM3/H requirements.
6.How does Aetrix verify that T4F18AHM3/H is sourced from the original manufacturer or authorized distributors?
All T4F18AHM3/H 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 T4F18AHM3/H meets industry standards.
7.What is the process for return or replacement of T4F18AHM3/H?
All T4F18AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with T4F18AHM3/H, 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 T4F18AHM3/H part is unused and in its original packaging.
Return procedure for T4F18AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F18AHM3/H Tags
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