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Vishay General Semiconductor - Diodes Division T4F12AHM3/I
- Part No.:
- T4F12AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F12AHM3/I.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
T4F12AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the eSMP® Series, designed for automotive-grade circuit protection. It features a 12.0 V nominal breakdown voltage (VBR), 10.2 V stand-off voltage (VWM), 400 W peak pulse power (10/1000 µs), 16.7 V maximum clamping voltage at rated surge current, and AEC-Q101 qualification for under-hood sensor line protection.
For engineers reviewing the T4F12AHM3/I datasheet, T4F12AHM3/I pinout, T4F12AHM3/I application, or T4F12AHM3/I equivalent, key selection criteria include its SMF (DO-219AB) package compatibility, 185 °C junction temperature rating, unidirectional polarity, low leakage (<1 µA at VWM), and suitability for high-reliability automotive transients induced by inductive load switching.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with junction passivation optimized for high-temperature stability. Its unidirectional architecture provides precise reverse-biased clamping during positive-going transients, while the low-profile SMF package enables compact placement near IC inputs or MOSFET gates.
Designed for automotive environments, the T4F12AHM3/I supports operation from –65 °C to +185 °C and meets MSL Level 1 reflow requirements (260 °C peak). Its thermal resistance junction-to-mount is 15–18 °C/W, enabling effective heat dissipation on standard FR4 PCBs with recommended copper pad areas.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 12.0 V - Ensures reliable triggering above 10.2 V system operating voltage without false clamping |
| VWM | 10.2 V - Maximum continuous reverse voltage before leakage exceeds 1 µA at 25 °C |
| VC @ IPPM | 16.7 V - Clamps 400 W surges (10/1000 µs) to safe levels for downstream 12 V logic/MOSFETs |
| PPPM | 400 W - Withstands automotive load-dump and ISO 7637-2 pulse 5a/b energy without failure |
| TJ max | +185 °C - Enables under-hood deployment where ambient temperatures exceed 125 °C |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD |
| Package | SMF (DO-219AB) - Low-profile 2.9 mm × 1.3 mm footprint compatible with automated SMT assembly |
Pinout & Package
Package: SMF (DO-219AB), surface-mount, unidirectional configuration with cathode indicated by color band. Matte tin-plated terminals, RoHS-compliant and halogen-free (HM3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-biased clamping | Connected to ground or low-impedance return path; defines conduction direction during overvoltage events |
| Cathode | Protected line connection point | Connected to signal/power line being protected; clamps to anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature capability | 185 °C maximum junction temperature enables use in engine control units and transmission modules |
| Low-profile packaging | SMF (DO-219AB) footprint (2.9 mm × 1.3 mm) saves board space in dense automotive ECUs |
| Automotive qualification | AEC-Q101 compliance ensures long-term reliability under vibration, thermal shock, and humidity stress |
| Robust surge handling | 400 W peak pulse power withstands repetitive ISO 7637-2 transients without parameter shift |
| Controlled leakage | <1 µA reverse leakage at VWM minimizes standby power loss in always-on vehicle networks |
Applications
| Automotive Sensor Protection | Power Line Transient Suppression |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp fast-rising transients before they reach sensitive input stages. Use Value: Prevents latch-up or permanent damage to microcontrollers and interface ICs during relay coil de-energization or motor commutation. | Use Scenario: Safeguarding 12 V power rails feeding infotainment head units, ADAS cameras, and body control modules against load dump events. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing up to 400 W of energy from ISO 7637-2 Pulse 5a (10/1000 µs) without degradation. Use Value: Maintains system uptime by limiting rail voltage to ≤16.7 V during 120 V/50 ms load dump pulses. |
| Engine Control Unit Inputs | Electric Power Steering (EPS) Feedback Lines |
Use Scenario: Shielding throttle position sensor (TPS) and crankshaft position sensor (CKP) analog outputs from ignition noise and alternator ripple. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) placed directly at connector entry to minimize signal distortion on millivolt-level sensor signals. Use Value: Preserves signal integrity while meeting stringent EMC requirements for ASIL-B functional safety paths. | Use Scenario: Protecting torque sensor and motor phase feedback lines in EPS systems exposed to high dv/dt switching noise from 3-phase inverters. IC Role / Device Role / Timing Role: Fast-response TVS with 12.0 V VBR and 16.7 V VC clamping to prevent false fault detection during PWM gate drive transitions. Use Value: Eliminates erroneous steering assist cutouts caused by transient-induced ADC saturation or comparator mis-triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/57T | Higher VC (20.1 V), lower PPPM (400 W same but derated faster above 25 °C), SMA package (larger footprint) | Less suitable for space-constrained automotive modules; higher clamping voltage may exceed 12 V IC absolute max ratings | Select only if existing SMA footprint reuse is required and thermal margin allows |
| 1.5SMC12A | Same VBR/VC specs but DO-214AB package (4.5 mm × 3.5 mm), higher RthJA (100 °C/W), not AEC-Q101 qualified | Not approved for automotive production; limited to industrial or consumer applications with lower reliability demands | Use only for prototyping or non-automotive designs where qualification is not mandated |
Compared with SMAJ12A-E3/57T and 1.5SMC12A, the T4F12AHM3/I delivers superior thermal performance (RthJM = 15–18 °C/W), smaller SMF footprint, and full AEC-Q101 validation-making it the preferred choice for production automotive electronics requiring long-term reliability under thermal stress.
Availability
T4F12AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, power line transient suppression, and engine control unit input conditioning requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for T4F12AHM3/I 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 T4F12AHM3/I belongs to Vishay's eSMP® Series of PAR® TVS diodes, engineered specifically for automotive-grade transient protection with emphasis on high-temperature operation, AEC-Q101 compliance, and compact surface-mount form factors.
FAQ
What is the maximum clamping voltage of the T4F12AHM3/I under a 10/1000 µs surge?
The T4F12AHM3/I has a maximum clamping voltage (VC) of 16.7 V when subjected to its rated peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per JEDEC-standard test conditions and ensures protected circuits remain within safe operating limits during automotive transients such as ISO 7637-2 Pulse 5a. The T4F12AHM3/I maintains this clamping performance across its full operating temperature range.
Is the T4F12AHM3/I suitable for use in automotive applications requiring AEC-Q101 qualification?
Yes, the T4F12AHM3/I is explicitly AEC-Q101 qualified, as confirmed in Vishay's official datasheet revision 14-Feb-2023 (Document Number: 87645). This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge (ESD), making the T4F12AHM3/I appropriate for production automotive systems including engine control, ADAS, and body electronics.
What package type does the T4F12AHM3/I use, and what are its key mechanical dimensions?
The T4F12AHM3/I uses the SMF (DO-219AB) package: a low-profile surface-mount outline measuring 2.9 mm × 1.3 mm × 1.08 mm (L × W × H), with a cathode band marking. Its footprint requires 0.85 mm pad width and 2.7 mm center-to-center terminal spacing, per Vishay's recommended land pattern. The HM3 suffix confirms halogen-free, RoHS-compliant construction with matte tin plating.
How does the T4F12AHM3/I perform at elevated junction temperatures?
The T4F12AHM3/I is rated for continuous operation up to +185 °C junction temperature, with derating curves provided in Figure 2 of its datasheet. Its breakdown voltage exhibits a positive temperature coefficient of +0.070 %/°C, meaning VBR increases predictably with temperature-enabling stable clamping behavior in under-hood environments where ambient temperatures exceed 125 °C. Thermal resistance junction-to-mount is 15–18 °C/W.
What is the reverse leakage current specification for the T4F12AHM3/I at its stand-off voltage?
At its 10.2 V stand-off voltage (VWM) and 25 °C ambient temperature, the T4F12AHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 µA. At elevated temperature (TJ = 150 °C), leakage remains ≤5.0 µA under the same VWM, ensuring minimal power loss in always-on automotive subsystems. This low leakage is critical for battery-sensitive applications like telematics and remote keyless entry receivers.
T4F12AHM3/I 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/I FAQ
1.How can I place an order for T4F12AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F12AHM3/I 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/I reliable?
The price and inventory of T4F12AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F12AHM3/I is usually 5 days.
3.What payment methods are accepted for T4F12AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F12AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F12AHM3/I?
T4F12AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F12AHM3/I 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/I?
For technical support, including T4F12AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F12AHM3/I requirements.
6.How does Aetrix verify that T4F12AHM3/I is sourced from the original manufacturer or authorized distributors?
All T4F12AHM3/I 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/I meets industry standards.
7.What is the process for return or replacement of T4F12AHM3/I?
All T4F12AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with T4F12AHM3/I, 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/I part is unused and in its original packaging.
Return procedure for T4F12AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F12AHM3/I Tags
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