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Vishay General Semiconductor - Diodes Division T4F27AHM3/I
- Part No.:
- T4F27AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F27AHM3/I.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
T4F27AHM3/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 27.0 V nominal breakdown voltage (VBR), 23.1 V stand-off voltage (VWM), 37.5 V maximum clamping voltage (VC) at 10.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed on signal lines of automotive sensor units to protect MOSFETs and ICs from inductive switching transients.
For engineers reviewing the T4F27AHM3/I datasheet, T4F27AHM3/I pinout, T4F27AHM3/I application, or T4F27AHM3/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 against Vishay Document #87645 (Rev. 14-Feb-2023).
Technical Context
The T4F27AHM3/I employs passivated anisotropic rectifier technology optimized for high-temperature stability up to TJ = 185 °C and meets AEC-Q101 stress test requirements. Its unidirectional configuration provides low-leakage reverse blocking (ID ≤ 1.0 µA at VWM) and fast response to transients induced by load switching.
Thermal performance is characterized by RthJA = 160 °C/W (max) on FR4 PCB and RthJM = 18 °C/W (max) to mounting surface, enabling reliable operation in under-hood automotive environments. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 25.7 / 27.0 / 28.4 V - ensures robust turn-on margin above 23.1 V operating stand-off voltage |
| VC @ IPPM | 37.5 V at 10.7 A - clamps surge energy within safe voltage limits for downstream 3.3 V/5 V/12 V logic and power stages |
| PPPM | 400 W (10/1000 µs) - sustains automotive-level load-dump and ISO 7637-2 pulse 5a/b energy without degradation |
| TJ max | +185 °C - supports continuous operation in engine control modules and transmission control units |
| AEC-Q101 qualified | Yes - validated for automotive reliability including HTRB, HTGB, and temperature cycling per JESD22-A108 |
| Package | SMF (DO-219AB) - low-profile 2.9 mm × 1.3 mm footprint compatible with automated SMT assembly and wave/reflow soldering |
| MSL Level | Level 1 (J-STD-020) - no dry-pack or bake required prior to assembly; peak reflow ≤ 260 °C |
Pinout & Package
Package: SMF (DO-219AB), surface-mount, low-profile case with cathode band marking. Molding compound meets UL 94 V-0; terminals are matte tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path; enables unidirectional clamping to ground |
| Cathode | Current exit terminal during reverse-biased transient suppression | Connected to protected line (e.g., sensor supply or signal); conducts surge current to ground when VLINE exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 185 °C junction rating | Enables placement in high-ambient zones (e.g., near engines or power converters) without derating penalties |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (12 V system) and Pulse 5b (24 V system) without failure |
| AEC-Q101 qualification | Validates long-term reliability for automotive electronics including ADAS, body control, and powertrain modules |
| Low leakage (≤1.0 µA @ VWM) | Minimizes standby power loss and avoids false triggering in always-on sensor circuits |
| SOD-123W-compatible outline | Allows drop-in replacement in existing layouts using standard SMT pick-and-place tooling and stencil apertures |
Applications
| Automotive Sensor Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors exposed to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient spikes to ground before they reach ADC inputs or signal conditioning amplifiers. Use Value: Maintains signal integrity below 37.5 V clamp level while supporting 185 °C ambient operation in under-hood locations. |
Use Scenario: Safeguarding 12 V supply rail of microcontrollers and CAN transceivers against load dump events (ISO 7637-2 Pulse 5). IC Role / Device Role / Timing Role: Fast-acting voltage clamp absorbing up to 400 W surge energy within microseconds to prevent brownout or latch-up. Use Value: Enables compliance with automotive OEM requirements without external series impedance or timing-critical coordination. |
| Body Control Module (BCM) Signal Lines | Infotainment System USB/UART Interfaces |
Use Scenario: Shielding LIN bus and PWM-controlled lighting drivers from ESD and relay-induced transients in door modules and seat controls. IC Role / Device Role / Timing Role: Low-capacitance unidirectional suppressor placed directly at connector entry points to shunt surges before IC-level protection. Use Value: Achieves <1.0 µA leakage at 23.1 V stand-off, preserving sleep-mode current budgets in battery-sensitive systems. |
Use Scenario: Guarding low-speed serial interfaces (e.g., UART debug ports or USB VBUS lines) in head units against hot-plug and ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS providing primary overvoltage defense upstream of internal IC ESD structures. Use Value: Delivers 37.5 V clamping at 10.7 A with minimal board space (2.9 mm × 1.3 mm), fitting tight layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Higher VBR (29.0–32.2 V), same SMF package, 400 W rating, but not AEC-Q101 qualified | Limited to industrial/commercial designs; lacks automotive qualification and 185 °C rating | Select when AEC-Q101 is not required and higher VBR margin is acceptable for 24 V systems |
| TPSMA6L28A | Same VBR range (26.6–29.4 V), AEC-Q101 qualified, but RthJA = 180 °C/W (vs. 160 °C/W for T4F27AHM3/I) | Lower thermal efficiency reduces sustained surge capability in high-ambient environments | Prefer T4F27AHM3/I for under-hood applications where thermal derating must be minimized |
Compared with SMAJ28A and TPSMA6L28A, the T4F27AHM3/I offers superior thermal resistance (RthJA ≤ 160 °C/W), guaranteed AEC-Q101 qualification, and tighter VBR tolerance (±5%), making it the optimal choice for automotive powertrain and chassis modules requiring long-term reliability at elevated temperatures.
Availability
T4F27AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, engine control unit (ECU) power input hardening, and body control module (BCM) signal line safeguarding requiring stable component supply across production lifecycles.
Supply support for T4F27AHM3/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 is a global leader in discrete semiconductors, specializing in high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The T4F27AHM3/I belongs to Vishay's eSMP® PAR® TVS family, engineered specifically for AEC-Q101-compliant automotive transient suppression with extended temperature capability and low-profile packaging.
FAQ
What is the exact breakdown voltage range for T4F27AHM3/I?
The T4F27AHM3/I has a guaranteed breakdown voltage (VBR) range of 25.7 V (minimum) to 28.4 V (maximum) at 1.0 mA test current, with a nominal value of 27.0 V. This specification is measured per ANSI/IEEE C62.35 and confirmed in Vishay Document #87645, Table 1. The tight ±5% tolerance ensures predictable clamping behavior in automotive 12 V and 24 V systems where precise overvoltage thresholds are critical.
Is T4F27AHM3/I qualified for automotive use?
Yes, the T4F27AHM3/I is fully AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling. It is rated for continuous operation up to +185 °C junction temperature and meets MSL Level 1 per J-STD-020 - making it suitable for under-hood applications such as engine control units, transmission control modules, and ADAS sensor interfaces.
What package does T4F27AHM3/I use, and what are its key mechanical features?
The T4F27AHM3/I uses the SMF (DO-219AB) package: a low-profile surface-mount case measuring 2.9 mm × 1.3 mm × 1.08 mm. It features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, UL 94 V-0 molding compound, and a cathode band for polarity identification. The footprint matches SOD-123W outlines, enabling compatibility with standard SMT assembly processes and reflow profiles up to 260 °C.
How does the clamping voltage of T4F27AHM3/I compare to its stand-off voltage?
The T4F27AHM3/I has a stand-off voltage (VWM) of 23.1 V and a maximum clamping voltage (VC) of 37.5 V at 10.7 A peak pulse current. This 14.4 V differential provides sufficient margin to avoid false triggering during normal operation while ensuring downstream components (e.g., 3.3 V or 5 V ICs) remain below absolute maximum ratings during transients - a key design advantage for automotive signal line protection.
What is the peak pulse power rating of T4F27AHM3/I, and under what waveform is it specified?
The T4F27AHM3/I is rated for 400 W peak pulse power with a standardized 10/1000 µs double-exponential current waveform, as defined in IEC 61000-4-5 and ISO 7637-2. This rating is valid at TA = 25 °C and derates linearly above that temperature per Figure 2 in Vishay Document #87645 - enabling accurate surge handling calculations for automotive load-dump and inductive switching event simulations.
T4F27AHM3/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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 10.7A
- 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)
T4F27AHM3/I FAQ
1.How can I place an order for T4F27AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F27AHM3/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 T4F27AHM3/I reliable?
The price and inventory of T4F27AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F27AHM3/I is usually 5 days.
3.What payment methods are accepted for T4F27AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F27AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F27AHM3/I?
T4F27AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F27AHM3/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 T4F27AHM3/I?
For technical support, including T4F27AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F27AHM3/I requirements.
6.How does Aetrix verify that T4F27AHM3/I is sourced from the original manufacturer or authorized distributors?
All T4F27AHM3/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 T4F27AHM3/I meets industry standards.
7.What is the process for return or replacement of T4F27AHM3/I?
All T4F27AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with T4F27AHM3/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 T4F27AHM3/I part is unused and in its original packaging.
Return procedure for T4F27AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F27AHM3/I Tags
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