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Vishay General Semiconductor - Diodes Division T4F51AHM3/H
- Part No.:
- T4F51AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F51AHM3/H.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:21,090
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Product details
Overview
T4F51AHM3/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. It features a 51 V breakdown voltage (VBR), 43.6 V stand-off voltage (VWM), 400 W peak pulse power (10/1000 µs), 70.1 V maximum clamping voltage (VC), and operates up to +185 °C junction temperature - ideal for protecting sensor signal lines and MOSFETs against inductive load switching transients in engine control units.
For engineers reviewing the T4F51AHM3/H datasheet, T4F51AHM3/H pinout, T4F51AHM3/H application, or T4F51AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification, SMF (DO-219AB) package compatibility, unidirectional polarity, 5.7 A peak pulse current rating, and 0.093 %/°C temperature coefficient of VBR.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for high-reliability operation under thermal stress. Its 185 °C maximum junction temperature and MSL Level 1 rating support reflow soldering at 260 °C and long-term deployment in under-hood automotive environments.
The device delivers precise clamping performance with a low 70.1 V VC at 5.7 A IPPM and exhibits stable reverse leakage (<1 µA at VWM) across temperature, enabled by its defined temperature coefficient (αT = 0.093 %/°C) and robust thermal resistance (RthJM ≤ 18 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 48.5 / 51.0 / 53.6 V - ensures reliable triggering above system operating voltage while accommodating manufacturing tolerance |
| VWM | 43.6 V - maximum continuous reverse working voltage without significant leakage |
| VC @ IPPM | 70.1 V - clamps transient surges to protect downstream 48 V-rated ICs and MOSFETs |
| PPPM | 400 W - handles 10/1000 µs lightning and load-dump transients per ISO 7637-2 |
| IPPM | 5.7 A - peak surge current capability derived from VC and PPPM (400 W / 70.1 V) |
| TJ max. | +185 °C - enables use in high-temperature zones such as powertrain and ADAS modules |
| αT | 0.093 %/°C - quantifies VBR drift with temperature for accurate clamping margin design |
Pinout & Package
Package: SMF (DO-219AB) - low-profile, halogen-free, RoHS-compliant surface-mount case with matte tin-plated leads; meets UL 94 V-0 and JESD 201 Class 2 whisker requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side reference point |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., sensor supply or signal); color band identifies this end |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, transmission, and ADAS systems |
| 185 °C junction rating | Supports operation in under-hood environments without derating up to ambient +150 °C |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns |
| Low-profile DO-219AB outline | Reduces board space vs. SMA/SMB packages while maintaining thermal performance |
| Passivated anisotropic rectifier technology | Delivers stable VBR and low leakage across temperature and lifetime |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Rail Protection |
|---|---|
Use Scenario: Protects 48 V supply inputs in diesel/gasoline ECU modules from load-dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC/DC input stage. Use Value: Limits voltage excursion to ≤70.1 V during 400 W surges, preventing damage to buck controller ICs rated for 60 V absolute maximum. | Use Scenario: Shields 12 V camera module power input against alternator-induced spikes and ESD events on vehicle harnesses. IC Role / Device Role / Timing Role: Primary overvoltage suppression device upstream of LDO regulators and image sensors. Use Value: Maintains <1 µA leakage at 43.6 V, avoiding quiescent current impact on always-on vision systems. |
| Electric Power Steering (EPS) Sensor Interface | Body Control Module (BCM) LIN Bus Line |
Use Scenario: Guards analog torque sensor signal lines (e.g., ratiometric bridge outputs) against inductive kickback from motor drivers. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface before signal conditioning amplifier. Use Value: Clamps transients within 1 ns response time while contributing negligible parasitic capacitance to maintain signal integrity at 10 kHz bandwidth. | Use Scenario: Protects LIN transceiver I/O pins from cable discharge events and bus fault conditions in door modules and lighting nodes. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and ground, referenced to local chassis potential. Use Value: Withstands repeated 10/1000 µs surges up to 400 W without parameter shift, ensuring long-term reliability in 15-year vehicle lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-HF | Same VBR (48.5–53.6 V), but SMA package (DO-214AC); RthJA = 195 °C/W vs. 160 °C/W for T4F51AHM3/H | Higher thermal resistance limits power handling in compact layouts; not AEC-Q101 qualified | Select when cost priority outweighs automotive qualification and thermal performance |
| 1.5SMC51A | Same electrical specs, but larger SMC (DO-214AB) package; 1.5 kW PPPM rating but requires larger PCB area | Over-specified power capability adds unnecessary board space; no AEC-Q101 validation | Choose only if legacy SMC footprint reuse is mandatory and thermal derating is acceptable |
Compared with SMAJ51A-HF and 1.5SMC51A, T4F51AHM3/H provides superior thermal performance (RthJM ≤ 18 °C/W), guaranteed AEC-Q101 compliance, and optimized low-profile packaging - making it the preferred choice for space-constrained, high-reliability automotive designs where junction temperature stability and qualification traceability are critical.
Availability
T4F51AHM3/H is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, electric power steering systems, and body control modules requiring stable component supply across extended production lifecycles.
Supply support for T4F51AHM3/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 T4F51AHM3/H belongs to Vishay's eSMP® PAR® TVS family, engineered specifically for high-temperature, high-reliability transient suppression in automotive powertrain and safety-critical subsystems.
FAQ
What is the exact breakdown voltage range for T4F51AHM3/H?
The T4F51AHM3/H has a guaranteed breakdown voltage (VBR) range of 48.5 V (minimum) to 53.6 V (maximum) at 1.0 mA test current, with a nominal value of 51.0 V. This range is verified per ANSI/IEEE C62.35 and measured after 300 µs square-wave pulse application, ensuring consistent clamping behavior across production lots.
Is T4F51AHM3/H qualified for automotive use?
Yes, T4F51AHM3/H is AEC-Q101 qualified and meets MSL Level 1 per J-STD-020 with a maximum peak reflow temperature of 260 °C. Its construction - including halogen-free molding compound, matte tin-plated leads, and JESD 201 Class 2 whisker resistance - satisfies automotive reliability requirements for under-hood and safety-critical applications.
What does the "HM3/H" suffix indicate in T4F51AHM3/H?
The "HM3" denotes the halogen-free, RoHS-compliant, AEC-Q101-qualified base variant in the SMF (DO-219AB) package; "/H" specifies the preferred packaging code for 7-inch plastic tape-and-reel delivery with 3000 units per reel. This ordering format ensures traceable, production-ready logistics aligned with Vishay's standard distribution channel.
How does T4F51AHM3/H compare to standard SMAJ series TVS diodes?
T4F51AHM3/H offers lower thermal resistance (RthJM ≤ 18 °C/W vs. ~25 °C/W for SMAJ), higher junction temperature rating (+185 °C vs. +150 °C), and full AEC-Q101 qualification - unlike most SMAJ variants. Its DO-219AB outline also reduces footprint area by ~30% compared to DO-214AC, enabling denser layout in modern automotive ECUs.
Can T4F51AHM3/H be used in bidirectional configurations?
No, T4F51AHM3/H is strictly unidirectional. Its internal structure and polarity marking (cathode band) support only reverse-biased clamping. For bidirectional protection, two T4F51AHM3/H devices must be connected in series opposing configuration, or a dedicated bidirectional TVS such as T4F51A-BP should be selected - though that part is not AEC-Q101 qualified per the same datasheet.
T4F51AHM3/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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
T4F51AHM3/H FAQ
1.How can I place an order for T4F51AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F51AHM3/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 T4F51AHM3/H reliable?
The price and inventory of T4F51AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F51AHM3/H is usually 5 days.
3.What payment methods are accepted for T4F51AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F51AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F51AHM3/H?
T4F51AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F51AHM3/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 T4F51AHM3/H?
For technical support, including T4F51AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F51AHM3/H requirements.
6.How does Aetrix verify that T4F51AHM3/H is sourced from the original manufacturer or authorized distributors?
All T4F51AHM3/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 T4F51AHM3/H meets industry standards.
7.What is the process for return or replacement of T4F51AHM3/H?
All T4F51AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with T4F51AHM3/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 T4F51AHM3/H part is unused and in its original packaging.
Return procedure for T4F51AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F51AHM3/H Tags
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