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Vishay General Semiconductor - Diodes Division T4F33AHM3/H
- Part No.:
- T4F33AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F33AHM3/H.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:20,900
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Product details
Overview
T4F33AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in the SMF (DO-219AB) package, rated for 400 W peak pulse power (10/1000 μs), 33.0 V nominal breakdown voltage (VBR), and 45.7 V maximum clamping voltage (VC) at 8.8 A peak surge current. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive-grade reliability in sensor signal line protection.
For engineers reviewing the T4F33AHM3/H datasheet, T4F33AHM3/H pinout, T4F33AHM3/H application, or T4F33AHM3/H equivalent, key selection criteria include its 28.2 V stand-off voltage (VWM), 1.0 μA reverse leakage at VWM, halogen-free RoHS-compliant HM3 packaging, and compatibility with wave/reflow soldering per J-STD-002 and JESD 22-B102.
Technical Context
The T4F33AHM3/H employs passivated anisotropic rectifier technology optimized for high-temperature stability and low-profile mounting. Its unidirectional architecture provides precise overvoltage clamping during inductive load switching transients, with thermal resistance RthJA of 160 °C/W on FR4 PCB and RthJM of 18 °C/W to mount.
Designed for automotive electronics, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), passes JESD 201 Class 2 whisker testing, and delivers stable VBR temperature coefficient of +0.089 %/°C - enabling predictable clamping behavior across -65 °C to +185 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 33.0 V - ensures reliable triggering above 28.2 V system stand-off voltage while maintaining margin against false trips |
| VC @ IPPM | 45.7 V - limits downstream IC/MOSFET stress during 8.8 A 10/1000 μs surge events |
| PPPM | 400 W - sustains automotive-level lightning and load-dump transients without degradation |
| VWM | 28.2 V - compatible with 24 V automotive supply rails and sensor interfaces |
| TJ max | +185 °C - supports under-hood placement in engine control units and ADAS modules |
| Leakage @ VWM | 1.0 μA - minimizes standby power loss in always-on vehicle networks |
| Package | SMF (DO-219AB) - 2.9 mm × 1.3 mm footprint with 0.85 mm height for space-constrained PCB layouts |
Pinout & Package
Package: SMF (DO-219AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during clamping | Connected to protected line (e.g., sensor output); conducts surge current to cathode when VBR exceeded |
| Cathode | Current exit point during clamping | Connected to ground or lower-potential rail; defines unidirectional conduction path and clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| 185 °C junction rating | Enables direct placement near heat sources in automotive ECUs without derating penalties |
| AEC-Q101 qualification | Validates robustness for automotive production use including temperature cycling, HTRB, and ESD testing |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/5a transients and IEC 61000-4-5 Level 3 surges |
| Low-profile SMF package | 0.85 mm max height allows integration beneath connectors and in multi-layer ADAS camera modules |
| MSL Level 1 rating | Eliminates bake-out requirement prior to reflow assembly, reducing manufacturing cost and cycle time |
Applications
| Automotive Sensor Protection | 24 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting analog outputs of pressure, temperature, and position sensors in engine bay environments subject to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode providing fast-response overvoltage clamping on sensor signal lines. Use Value: Limits transient excursions to ≤45.7 V, preserving ADC input integrity and preventing latch-up in microcontroller front-ends. | Use Scenario: Safeguarding 24 V supply inputs to body control modules and lighting drivers against ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Standoff-rated transient suppressor absorbing up to 400 W surge energy without failure. Use Value: Maintains 28.2 V stand-off while clamping to 45.7 V, ensuring downstream regulators remain within absolute maximum ratings. |
| ADAS Camera Interface Protection | Industrial CAN Transceiver Protection |
Use Scenario: Shielding MIPI CSI-2 data lanes in surround-view cameras from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) placed inline with high-speed differential pairs. Use Value: Provides 33 V breakdown threshold aligned with 28 V supply rails, minimizing signal distortion while meeting ISO 10605 ±15 kV ESD immunity. | Use Scenario: Protecting CANH/CANL pins of automotive-grade transceivers from inductive kickback in heavy-duty vehicle networks. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to CAN common-mode voltage, suppressing common-mode surges. Use Value: Delivers 8.8 A surge current handling at 45.7 V clamping, preserving CAN bus signal integrity during 12 V system faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Higher RthJA (190 °C/W), larger SMA package (4.5 mm × 2.7 mm), 33 V VBR min 31.4 V | Less suitable for high-density automotive PCBs due to 2.5× larger footprint and lower thermal efficiency | Select when legacy SMA footprint compatibility is required and board space permits |
| TPSMD33A | Same SMF package, but 33 V VBR min 31.35 V and 46.1 V VC; slightly higher leakage (2.0 μA) | Compatible for most 24 V systems but requires validation for ultra-low-power always-on nodes | Prefer for designs needing second-source availability with identical mechanical fit |
Compared with SMAJ33A-E3/57T and TPSMD33A, the T4F33AHM3/H offers superior thermal performance (RthJM = 18 °C/W), tighter VBR tolerance (±1.5 V vs. ±2.0 V), and lower leakage - making it optimal for thermally constrained, high-reliability automotive modules where long-term stability is critical.
Availability
T4F33AHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, 24 V power rail clamping, and ADAS camera interface protection requiring stable component supply and AEC-Q101 compliance.
Supply support for T4F33AHM3/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 diodes, rectifiers, and protection devices with emphasis on automotive, industrial, and computing applications.
The T4F33AHM3/H belongs to Vishay's PAR® series of high-reliability transient voltage suppressors, engineered specifically for harsh-environment automotive electronics where extended temperature operation and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of the T4F33AHM3/H at its rated peak pulse current?
The T4F33AHM3/H has a maximum clamping voltage (VC) of 45.7 V when subjected to its rated 8.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 3 in the Vishay datasheet 87645 and ensures protected circuitry remains below critical voltage thresholds during surge events. The T4F33AHM3/H maintains this clamping performance across its full operating temperature range.
Is the T4F33AHM3/H suitable for use in automotive applications requiring AEC-Q101 qualification?
Yes, the T4F33AHM3/H is explicitly AEC-Q101 qualified as stated in the Vishay datasheet 87645, Section "Features" and "Notes". It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification to meet automotive reliability standards. The T4F33AHM3/H is designed for deployment in engine control units, body electronics, and ADAS systems where AEC-Q101 compliance is mandatory.
What is the stand-off voltage (VWM) specification for the T4F33AHM3/H, and how does it relate to 24 V automotive systems?
The T4F33AHM3/H has a stand-off voltage (VWM) of 28.2 V, which provides a safe margin above nominal 24 V automotive battery rails while remaining well below its 33.0 V nominal breakdown voltage. This ensures no conduction during normal operation - including cold-crank (down to ~6 V) and load-dump (up to ~35 V) conditions - while allowing rapid clamping when transients exceed VBR. The T4F33AHM3/H thus protects downstream components without interfering with system functionality.
Does the T4F33AHM3/H support automated SMT assembly processes such as reflow and wave soldering?
Yes, the T4F33AHM3/H is fully compatible with both reflow and wave soldering per J-STD-002 and JESD 22-B102 standards. Its HM3 suffix confirms compliance with JESD 201 Class 2 whisker testing, and it meets MSL Level 1 per J-STD-020 with a maximum peak reflow temperature of 260 °C. The T4F33AHM3/H is supplied in 7" tape-and-reel (3000 pcs) for seamless pick-and-place integration into high-volume automotive PCB assembly lines.
How does the thermal resistance of the T4F33AHM3/H impact its power handling capability in compact automotive PCB layouts?
The T4F33AHM3/H features RthJM = 18 °C/W (junction-to-mount) and RthJA = 160 °C/W (junction-to-ambient on FR4), enabling efficient heat dissipation even in dense layouts with limited copper area. This allows sustained 400 W pulse handling without thermal runaway - critical for under-hood modules where ambient temperatures exceed 105 °C. The T4F33AHM3/H's low thermal resistance directly supports its 185 °C junction rating in real-world automotive deployments.
T4F33AHM3/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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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)
T4F33AHM3/H FAQ
1.How can I place an order for T4F33AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F33AHM3/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 T4F33AHM3/H reliable?
The price and inventory of T4F33AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F33AHM3/H is usually 5 days.
3.What payment methods are accepted for T4F33AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F33AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F33AHM3/H?
T4F33AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F33AHM3/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 T4F33AHM3/H?
For technical support, including T4F33AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F33AHM3/H requirements.
6.How does Aetrix verify that T4F33AHM3/H is sourced from the original manufacturer or authorized distributors?
All T4F33AHM3/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 T4F33AHM3/H meets industry standards.
7.What is the process for return or replacement of T4F33AHM3/H?
All T4F33AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with T4F33AHM3/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 T4F33AHM3/H part is unused and in its original packaging.
Return procedure for T4F33AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F33AHM3/H Tags
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