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Vishay General Semiconductor - Diodes Division T4F24AHM3/H
- Part No.:
- T4F24AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F24AHM3/H.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:20,992
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Product details
Overview
T4F24AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in the eSMP® Series, designed for automotive-grade overvoltage protection of sensitive signal lines and power rails. It features a 24.0 V nominal breakdown voltage (VBR), 20.5 V maximum stand-off voltage (VWM), 33.2 V clamping voltage at 12.0 A peak pulse current, 400 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood sensor interface protection.
For engineers reviewing the T4F24AHM3/H datasheet, T4F24AHM3/H pinout, T4F24AHM3/H application, or T4F24AHM3/H equivalent, this page provides verified package mapping (SMF/DO-219AB), junction temperature derating behavior, clamping performance at rated surge current, and validated alternatives for automotive ESD/surge protection design-in.
Technical Context
The T4F24AHM3/H employs passivated anisotropic rectifier technology with optimized junction passivation to sustain 185 °C maximum junction temperature-enabling operation in high-reliability automotive environments. Its unidirectional architecture supports DC-biased signal line protection without reverse conduction during normal operation.
It delivers 400 W peak pulse power per 10/1000 µs waveform with a thermal resistance of 135–160 °C/W (junction-to-ambient) on FR4 PCB, and meets MSL Level 1 reflow compatibility up to 260 °C peak. The device is halogen-free, RoHS-compliant, and qualified per JESD201 Class 2 whisker test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 24.0 V - Ensures reliable triggering above 20.5 V operating voltage while avoiding false clamping during transients. |
| VWM | 20.5 V - Maximum continuous reverse voltage before leakage exceeds 1 µA; defines safe operating margin for 12 V/24 V automotive systems. |
| VC @ IPPM | 33.2 V - Clamping voltage at 12.0 A surge current; limits downstream IC stress to ≤33.2 V during ISO 7637-2 Pulse 1/2a events. |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 µs waveform; sufficient for load-dump and inductive switching transients. |
| TJ max. | 185 °C - Enables placement near heat sources (e.g., engine control units) without derating loss in surge capability. |
| Package | SMF (DO-219AB) - Low-profile 2.9 mm × 1.3 mm footprint compatible with automated SMT assembly and high-density PCB layouts. |
| AEC-Q101 | Qualified - Validated for automotive applications including powertrain, body electronics, and ADAS sensor interfaces. |
Pinout & Package
Package: SMF (DO-219AB) - Surface-mount, low-profile case with matte tin-plated leads, cathode indicated by color band. Complies with JEDEC DO-219AB outline and UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected line (e.g., CAN_H, LIN, sensor supply); must be routed with low-inductance trace to minimize overshoot. |
| Cathode | Current exit terminal during clamping | Connected to ground or reference rail; requires low-impedance return path to maintain clamping integrity under fast transients. |
Key Features
| Feature | Design Value |
|---|---|
| 185 °C junction rating | Enables direct placement in high-temperature zones (e.g., near ECUs or motor drivers) without thermal derating penalties. |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) surges up to 40 V/100 ms without failure when properly heatsinked. |
| AEC-Q101 qualification | Validated for automotive reliability including HTOL, temperature cycling, and HAST-reducing qualification effort for Tier 1 suppliers. |
| SMF (DO-219AB) package | 0.85 mm height enables use in space-constrained modules (e.g., radar sensors, camera ECUs) while maintaining 1.0 W steady-state dissipation. |
| Halogen-free & RoHS | Meets global environmental compliance requirements for automotive OEMs including VW 80101 and GMW3172. |
Applications
| Automotive Sensor Protection | CAN/LIN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) in engine bay against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor output and ECU input to clamp transients before they reach ADC front-end. Use Value: Limits voltage excursion to ≤33.2 V during 12.0 A surge, preventing latch-up or damage to 3.3 V/5 V signal conditioning ICs. |
Use Scenario: Shielding CAN_H/CAN_L lines in body control modules from ESD and coupled noise in 12 V vehicle networks. IC Role / Device Role / Timing Role: Bidirectional protection not required; T4F24AHM3/H used on single-ended supply rail (e.g., CAN transceiver VCC) with separate GND reference. Use Value: Provides 400 W surge immunity while maintaining <1 µA leakage at 20.5 V, preserving bus bias stability and low-power sleep modes. |
| Power Supply Rail Clamp | ADAS Camera Module Protection |
|
Use Scenario: Safeguarding 24 V input rails of infotainment head units and telematics gateways against battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converters, sized to absorb energy before downstream LDOs or PMICs. Use Value: Clamps to 33.2 V within nanoseconds, limiting input stress on 36 V-rated buck controllers and enabling smaller input capacitors. |
Use Scenario: Hardening image sensor power and I²C lines in surround-view cameras exposed to under-hood EMI and thermal cycling. IC Role / Device Role / Timing Role: Discrete TVS on 1.8 V/3.3 V sensor IO rails and 5 V camera module supply, leveraging low capacitance and AEC-Q101 reliability. Use Value: Maintains <1 µA leakage at 20.5 V and operates up to 185 °C ambient-ensuring signal integrity across -40 °C to +125 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57T | Higher RthJA (180 °C/W), lower PPPM (400 W same), but VC = 38.9 V at 10.3 A - less effective clamping. | Less suitable for tight-clamp designs; acceptable where board layout allows larger copper pour for thermal relief. | Select when cost sensitivity outweighs clamping voltage optimization and thermal constraints are relaxed. |
| 1.5SMC24AHE3/A | Same VBR/VWM, but DO-214AB package (larger footprint, 4.5 mm × 3.5 mm); higher IPPM (12.5 A), VC = 36.0 V. | Requires PCB redesign due to larger case; better for high-surge industrial applications, not automotive space-constrained modules. | Choose only if SMF footprint is unavailable and thermal mass requirement exceeds 1.0 W steady-state dissipation. |
Compared with SMAJ24A-E3/57T and 1.5SMC24AHE3/A, the T4F24AHM3/H offers superior clamping (33.2 V vs. ≥36.0 V), lower profile (0.85 mm vs. ≥2.2 mm), and tighter automotive qualification scope-including explicit JESD201 Class 2 whisker testing-making it optimal for next-gen ADAS and powertrain modules.
Availability
T4F24AHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, CAN/LIN bus rail clamping, and ADAS camera module hardening requiring stable component supply across extended temperature and lifecycle demands.
Supply support for T4F24AHM3/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 high-reliability diodes, MOSFETs, and TVS devices for automotive, industrial, and computing markets.
The T4F24AHM3/H belongs to Vishay's eSMP® PAR® TVS family, engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments-emphasizing high-temperature stability, low-profile packaging, and repeatable clamping performance.
FAQ
What is the maximum clamping voltage of the T4F24AHM3/H at its rated peak pulse current?
The T4F24AHM3/H has a maximum clamping voltage (VC) of 33.2 V at 12.0 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream components remain within safe voltage limits during surge events. The T4F24AHM3/H maintains this clamping performance across its full operating temperature range.
Is the T4F24AHM3/H suitable for bidirectional transient protection?
No, the T4F24AHM3/H is unidirectional only, as confirmed in the Vishay datasheet revision 14-Feb-2023. It is intended for DC-biased applications such as power rail or signal line protection where reverse conduction is not required. For bidirectional protection, a different device like the SMBJ24A or equivalent dual-diode configuration would be necessary-not the T4F24AHM3/H.
What does the "HM3/H" suffix indicate in T4F24AHM3/H?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. The "/H" indicates packaging in 7-inch plastic tape and reel with 3000 units per reel. This full designation-T4F24AHM3/H-is the orderable part number reflecting both material compliance and delivery format.
Does the T4F24AHM3/H meet automotive reliability standards beyond AEC-Q101?
Yes, the T4F24AHM3/H meets MSL Level 1 per J-STD-020 (reflow peak of 260 °C), passes JESD201 Class 2 whisker testing, and uses UL 94 V-0 molding compound. These qualifications-alongside AEC-Q101-are explicitly documented in the Vishay datasheet for T4F24AHM3/H and support use in safety-critical automotive subsystems including powertrain and ADAS.
How does the thermal resistance of the T4F24AHM3/H affect its surge capability at elevated ambient temperatures?
The T4F24AHM3/H has RthJA = 135–160 °C/W on FR4 PCB. At 125 °C ambient, its usable surge energy drops ~40% versus 25 °C due to junction temperature derating (per Fig. 2 in the datasheet). Designers must limit pulse repetition rate or add copper thermal relief to maintain TJ ≤ 185 °C. This behavior is inherent to the T4F24AHM3/H's SMF package and must be modeled in thermal simulations.
T4F24AHM3/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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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)
T4F24AHM3/H FAQ
1.How can I place an order for T4F24AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F24AHM3/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 T4F24AHM3/H reliable?
The price and inventory of T4F24AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F24AHM3/H is usually 5 days.
3.What payment methods are accepted for T4F24AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F24AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F24AHM3/H?
T4F24AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F24AHM3/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 T4F24AHM3/H?
For technical support, including T4F24AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F24AHM3/H requirements.
6.How does Aetrix verify that T4F24AHM3/H is sourced from the original manufacturer or authorized distributors?
All T4F24AHM3/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 T4F24AHM3/H meets industry standards.
7.What is the process for return or replacement of T4F24AHM3/H?
All T4F24AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with T4F24AHM3/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 T4F24AHM3/H part is unused and in its original packaging.
Return procedure for T4F24AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F24AHM3/H Tags
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