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Vishay General Semiconductor - Diodes Division T4F39AHM3/H
- Part No.:
- T4F39AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F39AHM3/H.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:20,990
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Product details
Overview
T4F39AHM3/H 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 39.0 V nominal breakdown voltage (VBR), 33.3 V maximum standoff voltage (VWM), 53.9 V clamping voltage at 7.4 A peak pulse current, 400 W peak pulse power (10/1000 µs), and operates up to 185 °C junction temperature - deployed on sensor signal lines and MOSFET gate drivers in engine control units.
For engineers reviewing the T4F39AHM3/H datasheet, T4F39AHM3/H pinout, T4F39AHM3/H application, or T4F39AHM3/H equivalent, this page delivers verified electrical specs, SOD-123W-compatible SMF (DO-219AB) package details, AEC-Q101 qualification status, thermal derating curves, and direct alternatives for automotive ESD/surge protection design-in.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with optimized junction passivation for stable clamping under high-temperature transients. Its unidirectional architecture enables precise reverse-biased overvoltage clamping without forward conduction during normal operation.
Rated for 400 W peak pulse power per 10/1000 µs waveform and qualified to AEC-Q101, the T4F39AHM3/H supports automotive reliability requirements including MSL Level 1 reflow compatibility and 185 °C maximum junction temperature - critical for under-hood electronics exposed to thermal cycling and load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 37.1 / 39.0 / 41.0 V - ensures reliable triggering above system operating voltage while avoiding false trips during transients |
| VWM | 33.3 V - maximum continuous reverse voltage before leakage exceeds 1 µA, matching 3.3 V–24 V automotive supply rails |
| VC @ IPPM | 53.9 V - clamping voltage at 7.4 A peak surge current, limiting downstream IC stress during ISO 7637-2 Pulse 1/2a/5a events |
| PPPM | 400 W - peak pulse power handling capability with 10/1000 µs waveform, sufficient for CAN/LIN bus and sensor line protection |
| TJ max. | 185 °C - extended junction temperature rating enabling placement near heat sources in powertrain and ADAS modules |
| Package | SMF (DO-219AB) - low-profile SMD outline compatible with automated assembly and space-constrained PCB layouts |
| AEC-Q101 | Qualified - validated for automotive use including temperature cycling, humidity bias, and mechanical shock testing |
Pinout & Package
Package: SMF (DO-219AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals. Cathode indicated by color band. Compatible with SOD-123W footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected line (e.g., sensor output); conducts surge current to cathode when VRM exceeded |
| Cathode | Current exit terminal during clamping | Connected to ground or lower-potential rail; defines unidirectional clamping polarity and sets VWM/VBR reference |
Key Features
| Feature | Design Value |
|---|---|
| 185 °C junction rating | Enables deployment in high-temperature zones (e.g., near ECUs, inverters) without thermal derating penalties |
| AEC-Q101 qualification | Validates robustness across automotive qualification tests including HTOL, TC, HAST, and mechanical shock |
| 400 W peak pulse power | Withstands repetitive ISO 7637-2 load-dump surges up to 12 V systems without degradation |
| Low-profile SMF package | 0.85 mm height allows integration into compact ADAS camera modules and radar sensor PCBs |
| MSL Level 1 rating | Supports single-reflow assembly at 260 °C peak without moisture-induced popcorn failure |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Input Protection |
|---|---|
Use Scenario: Protects microcontroller I/O and analog sensor interfaces from load dump and inductive switching transients in 12 V vehicle electrical systems. IC Role / Device Role: Unidirectional TVS diode placed between sensor signal line and chassis ground. Use Value: Clamps transients to ≤53.9 V within nanoseconds, preserving signal integrity of oxygen and knock sensors operating at 33.3 V standoff. |
Use Scenario: Shields 5 V camera module power input from battery line surges during ignition and alternator regulation faults. IC Role / Device Role: Primary overvoltage clamp on VCC rail upstream of LDO regulator. Use Value: Absorbs 400 W pulses without failure, maintaining <1 µA leakage at 33.3 V to avoid quiescent current impact on always-on vision systems. |
| Automotive LIN Bus Transceiver Protection | Electric Power Steering (EPS) Motor Driver Gate Protection |
Use Scenario: Guards LIN transceiver pins against ESD and coupled noise from adjacent high-current wiring harnesses. IC Role / Device Role: Bidirectional-capable protection is not required; unidirectional T4F39AHM3/H suffices for LIN's single-wire topology with defined ground reference. Use Value: 53.9 V clamping prevents latch-up in transceivers rated for 40 V absolute maximum, meeting ISO 17987-4 immunity targets. |
Use Scenario: Protects high-side and low-side MOSFET gate drive signals from Miller-induced voltage spikes during motor commutation. IC Role / Device Role: TVS placed between gate and source of each power MOSFET in half-bridge configuration. Use Value: 185 °C rating ensures stable clamping performance during sustained EPS motor stall conditions where ambient reaches 150 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A-H | 36 V VBR, 58.1 V VC @ 6.9 A, same SMF package, AEC-Q101 qualified | Lower clamping voltage margin; suitable where 36 V system rails require tighter overvoltage headroom | Select SMAJ36A-H when protecting 3.3 V or 5 V logic interfaces downstream of 36 V DC-DC converters |
| TPSMA6L33A | 33 V VBR, 53.3 V VC @ 7.5 A, same SMF package, AEC-Q101 qualified | Lower VWM (29.7 V) reduces margin for 33 V nominal systems but improves response speed | Choose TPSMA6L33A for 24 V CAN FD networks requiring faster turn-on and lower leakage at elevated temperatures |
Compared with T4F39AHM3/H, SMAJ36A-H offers lower clamping but reduced standoff margin, while TPSMA6L33A provides faster response at lower voltage rails - both retain AEC-Q101 qualification and SMF packaging but differ in VBR/VC trade-offs for specific automotive subsystems.
Availability
T4F39AHM3/H is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and electric power steering systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for T4F39AHM3/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, high-temperature, and automotive-qualified components.
The T4F39AHM3/H belongs to the eSMP® Series of PAR® Transient Voltage Suppressors, engineered specifically for automotive-grade surge and ESD protection in harsh environments where thermal stability and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the T4F39AHM3/H at its rated peak pulse current?
The T4F39AHM3/H has a maximum clamping voltage (VC) of 53.9 V at its rated peak pulse current of 7.4 A using a 10/1000 µs waveform. This value is measured per JEDEC-standard test conditions and ensures downstream components remain below their absolute maximum voltage ratings during surge events. The T4F39AHM3/H maintains this clamping performance across its full operating temperature range up to 185 °C junction temperature.
Is the T4F39AHM3/H qualified for automotive applications?
Yes, the T4F39AHM3/H is AEC-Q101 qualified and meets MSL Level 1 per J-STD-020 with a maximum lead finish temperature of 260 °C. It is specifically designed for automotive use cases including engine control, ADAS, and powertrain systems. The T4F39AHM3/H undergoes rigorous stress testing for temperature cycling, humidity bias, and mechanical shock - all documented in Vishay's AEC-Q101 certification report for the T4FxxA family.
What package type does the T4F39AHM3/H use, and is it compatible with standard SMT processes?
The T4F39AHM3/H uses the SMF (DO-219AB) package - a low-profile surface-mount outline with 0.85 mm height and matte tin-plated terminals. It is fully compatible with standard wave and reflow soldering processes, including lead-free reflow profiles up to 260 °C peak temperature. The T4F39AHM3/H footprint matches SOD-123W land patterns and supports automated pick-and-place assembly at high throughput rates.
How does the T4F39AHM3/H compare to other TVS diodes in the T4FxxA series?
The T4F39AHM3/H is the 39 V variant in the T4F10A–T4F51A family, offering a nominal breakdown voltage of 39.0 V and standoff voltage of 33.3 V. Within the series, it sits between T4F36A (36 V) and T4F43A (43 V), providing optimal margin for 36 V nominal automotive subsystems such as 48 V mild-hybrid gate drivers and high-side sensor supplies. All variants share identical SMF packaging, 400 W rating, and AEC-Q101 qualification.
What is the thermal resistance specification for the T4F39AHM3/H, and how does it affect PCB layout?
The T4F39AHM3/H has a typical junction-to-ambient thermal resistance (RthJA) of 135 °C/W and a maximum of 160 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and recommended footprint. To maintain safe junction temperatures under repeated surge conditions, designers should implement minimum 5.0 mm × 5.0 mm copper pads per terminal and avoid excessive thermal isolation. The T4F39AHM3/H's RthJM of 15–18 °C/W also supports thermal coupling to internal ground planes in multi-layer boards.
T4F39AHM3/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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- 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)
T4F39AHM3/H FAQ
1.How can I place an order for T4F39AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F39AHM3/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 T4F39AHM3/H reliable?
The price and inventory of T4F39AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F39AHM3/H is usually 5 days.
3.What payment methods are accepted for T4F39AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F39AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F39AHM3/H?
T4F39AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F39AHM3/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 T4F39AHM3/H?
For technical support, including T4F39AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F39AHM3/H requirements.
6.How does Aetrix verify that T4F39AHM3/H is sourced from the original manufacturer or authorized distributors?
All T4F39AHM3/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 T4F39AHM3/H meets industry standards.
7.What is the process for return or replacement of T4F39AHM3/H?
All T4F39AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with T4F39AHM3/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 T4F39AHM3/H part is unused and in its original packaging.
Return procedure for T4F39AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F39AHM3/H Tags
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