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Vishay General Semiconductor - Diodes Division T4F12AHM3/H
- Part No.:
- T4F12AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F12AHM3/H.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:21,000
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Product details
Overview
T4F12AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in SMF (DO-219AB) package, rated for 12.0 V nominal breakdown voltage (VBR), 400 W peak pulse power (10/1000 µs), and 185 °C maximum junction temperature - designed for automotive-grade overvoltage protection of sensor signal lines and MOSFET gate drivers.
For engineers reviewing the T4F12AHM3/H datasheet, T4F12AHM3/H pinout, T4F12AHM3/H application, or T4F12AHM3/H equivalent, key selection criteria include clamping voltage (16.7 V at 24.0 A), low leakage (<1.0 µA at 10.2 V), AEC-Q101 qualification, and SOD-123W-compatible footprint with cathode band polarity marking.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge conditions, with thermal resistance RthJM as low as 15 °C/W enabling high-reliability operation up to TJ = 185 °C. Its unidirectional architecture provides precise reverse-biased transient suppression without forward conduction interference.
The device meets J-STD-020 MSL Level 1 and supports wave/reflow soldering at 260 °C peak. Its 10.2 V stand-off voltage (VWM) and 16.7 V clamping voltage (VC) at 24.0 A IPPM ensure robust margin between operating and protection thresholds in 12 V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nom) | 12.0 V - ensures reliable triggering above normal 12 V rail transients while avoiding false trips |
| VWM | 10.2 V - maximum continuous reverse voltage before leakage exceeds 1.0 µA, compatible with 12 V system tolerances |
| VC @ IPPM | 16.7 V - clamps 24.0 A surge (10/1000 µs) to safe level for downstream ICs and MOSFETs |
| PPPM | 400 W - sustains standardized lightning/inductive-switching surges per IEC 61000-4-5 |
| TJ max | 185 °C - enables under-hood deployment in automotive ECUs without derating penalties |
| Package | SMF (DO-219AB) - low-profile 2.9 mm × 1.3 mm footprint with matte tin leads and JESD201 Class 2 whisker resistance |
Pinout & Package
Package: SMF (DO-219AB) - surface-mount, single-ended, two-terminal device with cathode indicated by color band. Dimensions: 2.9 mm × 1.3 mm × 1.08 mm (L × W × H); compliant with JEDEC DO-219AB outline and SOD-123W mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for unidirectional clamping | Connected to protected circuit ground or low-side return path; defines forward bias direction |
| Cathode | Transient current sink terminal | Connected to line being protected (e.g., sensor output); carries full surge current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD |
| Junction temperature rating | 185 °C maximum enables direct placement near heat sources in engine control modules |
| Low clamping ratio | VC/VBR = 1.39 - tight voltage margin preserves noise immunity while ensuring fast response |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental regulations and material categorization per Vishay Doc. 99912 |
Applications
| Automotive Sensor Protection | 12 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting analog outputs of pressure, temperature, and position sensors in engine bay environments subject to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ground to clamp transients before they reach ADC input or signal conditioner. Use Value: 10.2 V VWM avoids interference with 0–5 V sensor signals; 16.7 V VC prevents damage to 16 V-rated op-amps and microcontroller inputs. | Use Scenario: Safeguarding 12 V supply rails feeding infotainment head units, body control modules, and lighting drivers against battery disconnection spikes. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across input capacitor to absorb energy from 100 V/50 ms load dump events. Use Value: 400 W PPPM handles worst-case ISO 16750-2 Category C5 surges; 185 °C TJ rating maintains reliability at elevated ambient temperatures. |
| MOSFET Gate Driver Protection | Industrial CAN Bus Line Protection |
Use Scenario: Shielding high-side N-channel MOSFET gate drivers in motor control inverters from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: TVS placed between gate and source terminals to limit dv/dt-induced overshoot and prevent gate oxide breakdown. Use Value: Fast response time (<1 ns) and low VC (16.7 V) ensure gate voltage stays within ±20 V absolute maximum rating of common logic-level MOSFETs. | Use Scenario: Protecting CAN_H and CAN_L differential pair interfaces in industrial automation nodes exposed to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS on each bus line referenced to ground, providing asymmetric surge handling aligned with CAN physical layer asymmetry. Use Value: 1.0 µA max leakage at VWM prevents signal distortion on 120 Ω terminated bus; low capacitance (<100 pF) preserves 1 Mbps bit integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-HF | Higher VC (20.1 V), lower PPPM (400 W same), SMA package (larger footprint, higher RthJA) | Less suitable for space-constrained automotive modules; requires larger PCB pad area | Select when legacy SMA layout exists and thermal budget allows higher RthJA (195 °C/W) |
| 1.5SMC12A | Same VBR range but SMC package (7.1 mm × 6.2 mm), higher PPPM (1500 W), no AEC-Q101 qualification | Not approved for automotive use; better suited for industrial AC/DC front-end protection | Choose only for non-automotive applications requiring higher surge capacity and no temperature or qualification constraints |
Compared with SMAJ12A-HF and 1.5SMC12A, T4F12AHM3/H delivers superior thermal performance (RthJM = 15 °C/W), automotive qualification, and compact DO-219AB packaging - making it optimal for next-generation automotive electronics where board space, reliability, and under-hood temperature margins are critical.
Availability
T4F12AHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, 12 V power rail clamping, and MOSFET gate driver safeguarding requiring stable component supply and long-term production continuity.
Supply support for T4F12AHM3/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, automotive-qualified components.
The T4F12AHM3/H belongs to Vishay's eSMP® Series PAR® TVS family, engineered specifically for high-temperature, high-reliability transient suppression in automotive and industrial control systems where AEC-Q101 compliance and 185 °C operation are mandatory.
FAQ
What is the clamping voltage of the T4F12AHM3/H at its rated peak pulse current?
The T4F12AHM3/H has a maximum clamping voltage (VC) of 16.7 V when subjected to its rated peak pulse current (IPPM) of 24.0 A under a 10/1000 µs waveform. This value is measured per Figure 3 in the Vishay datasheet 87645 and ensures protected circuits remain below critical voltage thresholds during surge events. The T4F12AHM3/H maintains this clamping performance across its full operating temperature range.
Is the T4F12AHM3/H qualified for automotive applications?
Yes, the T4F12AHM3/H is AEC-Q101 qualified, having passed all required stress tests including high-temperature operating life, temperature cycling, unbiased highly accelerated stress testing, and electrostatic discharge. This qualification confirms its suitability for automotive electronic control units, sensor modules, and powertrain systems where reliability under harsh thermal and electrical conditions is essential. The T4F12AHM3/H also meets MSL Level 1 per J-STD-020.
What does the "HM3" suffix indicate in T4F12AHM3/H?
The "HM3" suffix in T4F12AHM3/H denotes halogen-free construction, RoHS compliance, and qualification to JESD201 Class 2 for tin whisker resistance. It also signifies that the device meets Vishay's internal material categorization standards per document 99912. The trailing "/H" indicates packaging in 7-inch plastic tape and reel with a base quantity of 3000 units - a standard logistics configuration for automated SMT assembly of the T4F12AHM3/H.
How does the thermal performance of T4F12AHM3/H compare to standard SMA-package TVS diodes?
The T4F12AHM3/H offers significantly improved thermal performance versus SMA-package alternatives, with a junction-to-mount thermal resistance (RthJM) of 15 °C/W versus ~35–45 °C/W for typical SMA devices. Its SMF (DO-219AB) package enables more efficient heat transfer to the PCB copper, supporting sustained operation at TJ = 185 °C. This makes the T4F12AHM3/H especially advantageous in thermally dense automotive modules where the T4F12AHM3/H replaces larger-footprint alternatives without compromising surge capability.
Can the T4F12AHM3/H be used in bidirectional configurations?
No, the T4F12AHM3/H is unidirectional only, as explicitly stated in the Vishay datasheet. It provides transient suppression only in the reverse-bias direction - from cathode to anode - and conducts no significant current in forward bias beyond standard diode characteristics. For bidirectional protection, two T4F12AHM3/H devices must be connected in series opposition, or a dedicated bidirectional TVS such as the T4F12AYM3/H should be selected instead.
T4F12AHM3/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):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 24A
- 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)
T4F12AHM3/H FAQ
1.How can I place an order for T4F12AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F12AHM3/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 T4F12AHM3/H reliable?
The price and inventory of T4F12AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F12AHM3/H is usually 5 days.
3.What payment methods are accepted for T4F12AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F12AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F12AHM3/H?
T4F12AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F12AHM3/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 T4F12AHM3/H?
For technical support, including T4F12AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F12AHM3/H requirements.
6.How does Aetrix verify that T4F12AHM3/H is sourced from the original manufacturer or authorized distributors?
All T4F12AHM3/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 T4F12AHM3/H meets industry standards.
7.What is the process for return or replacement of T4F12AHM3/H?
All T4F12AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with T4F12AHM3/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 T4F12AHM3/H part is unused and in its original packaging.
Return procedure for T4F12AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F12AHM3/H Tags
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