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Vishay General Semiconductor - Diodes Division T4F47AHM3/I
- Part No.:
- T4F47AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F47AHM3/I.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:19,964
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Product details
Overview
T4F47AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in the eSMP® Series, designed for automotive-grade overvoltage protection. It features a 47.0 V nominal breakdown voltage (VBR), 400 W peak pulse power (10/1000 μs), 64.8 V maximum clamping voltage at 6.2 A surge current, and operates up to +185 °C junction temperature - ideal for protecting sensor signal lines and MOSFET gates in engine control units.
For engineers reviewing the T4F47AHM3/I datasheet, T4F47AHM3/I pinout, T4F47AHM3/I application, or T4F47AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SMF (DO-219AB) package dimensions, thermal resistance values, and real-world automotive protection use cases - all confirmed from Vishay's official document #87645 (Rev. 14-Feb-2023).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with optimized junction passivation for stable clamping under high-temperature stress. Its unidirectional configuration enables precise reverse-biased transient suppression on DC power rails and signal paths without forward conduction interference.
The device meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports wave and reflow soldering, and achieves 15–18 °C/W junction-to-mount thermal resistance - enabling reliable thermal coupling to PCB copper pads in compact automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 47.0 V - ensures accurate triggering above system operating voltage while maintaining margin against false clamping. |
| VWM | 40.2 V - maximum continuous reverse stand-off voltage compatible with 36 V automotive battery systems. |
| VC @ IPPM | 64.8 V - clamps transients to safe levels for downstream 65 V-rated ICs and MOSFETs during 10/1000 μs surges. |
| PPPM | 400 W - sustains high-energy ESD and load-dump pulses common in 12 V/24 V vehicle networks. |
| TJ max. | +185 °C - supports under-hood placement in engine compartments without derating loss. |
| RthJM | 15–18 °C/W - enables efficient heat transfer to mounting pad, critical for sustained surge duty cycles. |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD robustness. |
Pinout & Package
Package: SMF (DO-219AB) - low-profile surface-mount case with matte tin-plated leads, UL 94 V-0 molding compound, and cathode indicated by color band. Dimensions: 3.9 × 2.7 × 1.3 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected line (e.g., sensor output); conducts surge current toward ground path. |
| Cathode | Current exit terminal during clamping | Connected to system ground; polarity marking ensures correct orientation on PCB to prevent reverse bias failure. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous operation up to +185 °C junction temperature - eliminates thermal derating in engine bay applications. |
| AEC-Q101 qualification | Validated across temperature cycling, high-temperature reverse bias, and ESD tests - meets automotive electronics reliability requirements. |
| Low-profile SMF package | 3.9 × 2.7 mm footprint with 1.3 mm height - fits space-constrained ADAS camera modules and body control units. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental standards and JESD201 Class 2 whisker resistance - suitable for global automotive supply chains. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a/b (load dump) without degradation - no need for external series impedance. |
Applications
| Automotive Sensor Protection | Power Rail Clamping |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine management systems exposed to inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ECU input to clamp transients before they reach precision ADC front-ends. Use Value: Prevents measurement errors and latch-up in 12-bit sensor interfaces by limiting voltage excursions to ≤64.8 V during 10/1000 μs surges. |
Use Scenario: Safeguarding 36 V-rated microcontrollers and CAN transceivers on 24 V vehicle power distribution boards. IC Role / Device Role / Timing Role: Standoff protection on VCC rail upstream of LDO regulators to absorb load-dump energy before it propagates into logic circuitry. Use Value: Maintains system uptime by preventing brownouts and resets during ISO 16750-2 load-dump events up to 35 V for 400 ms. |
| MOSFET Gate Protection | Infotainment Interface Lines |
Use Scenario: Shielding high-side N-channel MOSFET gates in LED headlight drivers from gate-source voltage spikes induced by fast-switching inductors. IC Role / Device Role / Timing Role: TVS connected directly between gate and source terminals to clamp VGS transients below absolute maximum rating (±20 V). Use Value: Eliminates gate oxide breakdown risk during PWM transitions, extending MOSFET lifetime in 100 kHz+ switching applications. |
Use Scenario: Securing USB 2.0 and LVDS video lines in center-stack infotainment displays against ESD events from user contact. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF at VWM) placed inline with differential pairs to suppress ±15 kV contact ESD without signal integrity loss. Use Value: Passes IEC 61000-4-2 Level 4 testing while preserving eye diagram margins for 480 Mbps USB data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ47A-E3/57T | Same VBR (47 V), but lower PPPM = 400 W (same), higher VC = 77.0 V, SMA package (larger footprint, RthJA = 195 °C/W). | Less effective clamping margin for 65 V-rated devices; unsuitable for tight thermal constraints due to higher thermal resistance. | Select only if legacy SMA layout exists and thermal budget allows >2× junction temperature rise vs. T4F47AHM3/I. |
| 1.5SMC47A | Same VBR, but DO-214AB package, PPPM = 1500 W, VC = 77.0 V, RthJA = 100 °C/W - larger size, higher clamping voltage. | Better surge handling but worse voltage clamping; requires board area increase and may compromise protection of low-voltage ICs. | Prefer when system faces extreme ISO 7637-2 Pulse 5b (110 V, 400 ms) but can tolerate higher clamping voltage and larger PCB footprint. |
Compared with SMAJ47A-E3/57T and 1.5SMC47A, the T4F47AHM3/I delivers superior thermal performance (RthJM ≤18 °C/W), tighter clamping (64.8 V), and automotive-qualified reliability in a 3.9 mm × 2.7 mm footprint - making it optimal for next-generation compact, high-temperature automotive ECUs.
Availability
T4F47AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, power rail clamping, and MOSFET gate safeguarding requiring stable component supply across production lifecycles.
Supply support for T4F47AHM3/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The T4F47AHM3/I belongs to Vishay's eSMP® PAR® TVS family, engineered specifically for robust transient suppression in harsh automotive environments where AEC-Q101 compliance and +185 °C operation are mandatory.
FAQ
What is the breakdown voltage tolerance for T4F47AHM3/I?
The T4F47AHM3/I has a specified breakdown voltage range of 44.7 V (min) to 49.4 V (max) at 1.0 mA test current, with 47.0 V as the nominal value. This ±5% tolerance ensures consistent clamping behavior across production lots while accommodating process variation - critical for meeting automotive functional safety thresholds in ECU designs.
Is T4F47AHM3/I suitable for bidirectional transient protection?
No, the T4F47AHM3/I is unidirectional only, as confirmed in Vishay's datasheet document #87645. It must be installed with cathode oriented toward the protected circuit's ground reference. For bidirectional protection, engineers must select a different part number such as the T4F47CAHM3/I - not the T4F47AHM3/I - which is explicitly rated for symmetrical clamping.
What is the maximum reverse leakage current of T4F47AHM3/I at 125 °C?
At 125 °C junction temperature, the T4F47AHM3/I exhibits ≤5.0 μA maximum reverse leakage current at its 40.2 V stand-off voltage (VWM). This low leakage preserves battery standby current in always-on automotive modules and avoids false triggering in high-impedance sensor circuits.
Does T4F47AHM3/I require derating at elevated ambient temperatures?
Yes - the T4F47AHM3/I's peak pulse power must be derated above 25 °C ambient, per Figure 2 in Vishay's datasheet #87645. At 85 °C ambient, its 400 W rating drops to ~280 W; at 125 °C, it falls to ~180 W. Designers must apply these derating curves when sizing for sustained surge duty in under-hood locations.
What does the "HM3" suffix indicate in T4F47AHM3/I?
The "HM3" suffix in T4F47AHM3/I denotes halogen-free construction, RoHS compliance, AEC-Q101 qualification, and JESD201 Class 2 whisker resistance - all verified per Vishay's material categorization standard (doc #99912). It also specifies packaging in 13-inch tape-and-reel format with 10,000 units per reel.
T4F47AHM3/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):
- 40.2V
- Voltage - Breakdown (Min):
- 44.7V
- Voltage - Clamping (Max) @ Ipp:
- 64.8V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
T4F47AHM3/I FAQ
1.How can I place an order for T4F47AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F47AHM3/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 T4F47AHM3/I reliable?
The price and inventory of T4F47AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F47AHM3/I is usually 5 days.
3.What payment methods are accepted for T4F47AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F47AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F47AHM3/I?
T4F47AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F47AHM3/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 T4F47AHM3/I?
For technical support, including T4F47AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F47AHM3/I requirements.
6.How does Aetrix verify that T4F47AHM3/I is sourced from the original manufacturer or authorized distributors?
All T4F47AHM3/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 T4F47AHM3/I meets industry standards.
7.What is the process for return or replacement of T4F47AHM3/I?
All T4F47AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with T4F47AHM3/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 T4F47AHM3/I part is unused and in its original packaging.
Return procedure for T4F47AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F47AHM3/I Tags
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