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Vishay General Semiconductor - Diodes Division T4F27AHM3/H
- Part No.:
- T4F27AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F27AHM3/H.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:21,096
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Product details
Overview
T4F27AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in the eSMP® Series, designed for automotive-grade circuit protection. It features a 27.0 V nominal breakdown voltage (VBR), 400 W peak pulse power (10/1000 μs), 37.5 V maximum clamping voltage at 10.7 A surge current, 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 T4F27AHM3/H datasheet, T4F27AHM3/H pinout, T4F27AHM3/H application, or T4F27AHM3/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, SMF (DO-219AB) package dimensions, thermal resistance data, and real-world automotive protection use cases - all aligned with Vishay Document #87645 (Rev. 14-Feb-2023).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low-leakage performance. Its unidirectional configuration provides precise reverse-biased clamping during positive transients, with VBR = 25.7–28.4 V (min–max) at 1.0 mA test current and αT = 0.087 %/°C temperature coefficient.
It meets JEDEC J-STD-020 MSL Level 1 (260 °C peak reflow), supports wave and reflow soldering, and achieves RthJA = 160 °C/W on FR4 PCB - enabling reliable operation in under-hood automotive environments where thermal derating above 25 °C must be applied per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nom) | 27.0 V - ensures stable triggering threshold across production lots and temperature range |
| VWM | 23.1 V - maximum continuous reverse working voltage before leakage exceeds 1.0 μA at 25 °C |
| VC @ IPPM | 37.5 V - clamps 10.7 A transient to safe level for protected ICs (e.g., CAN transceivers, microcontrollers) |
| PPPM | 400 W - handles ISO 7637-2 Pulse 1/2a/3a surges without failure when mounted per recommended footprint |
| TJ max | +185 °C - supports placement near heat sources in automotive ECUs without derating loss of protection margin |
| RthJA | 160 °C/W - defines thermal limit for 1.0 W steady-state dissipation on standard 2 oz. FR4 layout |
| AEC-Q101 | Qualified - validated for automotive reliability including HTOL, temperature cycling, and HTRB testing |
Pinout & Package
Package: SMF (DO-219AB), low-profile surface-mount case with matte tin-plated leads; polarity indicated by cathode band; compatible with JEDEC-standard SOD-123W footprint but with enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping |
| Cathode | Protected line connection point | Connected to signal/power line being safeguarded; reverse-biased during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use at TJ = 185 °C - eliminates need for oversized heatsinking in compact ECU modules |
| AEC-Q101 qualification | Validated for automotive under-hood applications - satisfies stress-test requirements for lifetime reliability |
| Low-profile SMF package | Height ≤ 1.3 mm - enables placement beneath connectors or in space-constrained sensor housings |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental regulations and whisker resistance (JESD 201 Class 2) |
| Stable clamping ratio | VC/VBR ≈ 1.39 - ensures predictable voltage limiting across production and temperature |
Applications
| Automotive Sensor Protection | Power Supply Rail Clamping |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine management systems exposed to load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ECU input to clamp fast-rising spikes before they reach ADC front-end or op-amp buffers. Use Value: Prevents sensor signal corruption and ECU reset events caused by 400 W transients while maintaining <1.0 μA leakage at 23.1 V operating voltage. | Use Scenario: Safeguarding 24 V supply rails feeding motor drivers and solenoid controllers in transmission control modules. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 50 ms) energy on main power distribution nodes. Use Value: Limits rail collapse to ≤37.5 V during 10.7 A surge, preserving logic-level integrity for downstream PMICs and gate drivers. |
| MOSFET Gate Protection | CAN Bus Line Protection |
Use Scenario: Shielding N-channel high-side switch gates from Miller-induced voltage overshoot during fast turn-off in fuel injector drivers. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at gate-source terminals to suppress sub-100 ns ringing without affecting switching speed. Use Value: Maintains gate oxide safety margin with 23.1 V standoff and 37.5 V clamping - avoids unintended turn-on or dielectric stress. | Use Scenario: Adding secondary protection on CAN_H/CAN_L lines downstream of primary common-mode chokes in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS on each line referenced to ground, handling asymmetrical ESD and burst events per ISO 10605. Use Value: Provides 37.5 V clamping with <1.0 μA leakage at 23.1 V - preserves bus differential signaling integrity and failsafe dominant-mode behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-HF | Same VBR range (28.0 V nom), but lower PPPM = 400 W only at 1.5 × 10/1000 μs; RthJA = 180 °C/W; not AEC-Q101 qualified | Limited to industrial/commercial use; unsuitable for automotive under-hood deployment due to missing qualification and higher thermal resistance | Select only for cost-sensitive non-automotive designs where AEC-Q101 and 185 °C operation are not required |
| 1.5SMC27A | Higher PPPM = 1500 W, but larger SMC (DO-214AB) package; VC = 43.0 V at 35 A; TJ max = 175 °C; AEC-Q101 qualified | Better surge handling but requires 3× board area; clamping voltage 15% higher - may exceed protected device's absolute max rating | Choose when system-level surge tests exceed 400 W or when legacy SMC footprint is fixed; avoid if space or VC margin is constrained |
Compared with SMAJ28A-HF and 1.5SMC27A, the T4F27AHM3/H delivers optimal balance of automotive qualification, compact SMF packaging, and precise 37.5 V clamping - making it preferred for new ECU designs where thermal density, reliability, and layout efficiency are prioritized.
Availability
T4F27AHM3/H is available at Aetrix Electronics and suitable for automotive engine control units, sensor interface modules, and power distribution systems requiring stable component supply, AEC-Q101 compliance, and high-temperature operational continuity.
Supply support for T4F27AHM3/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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The T4F27AHM3/H belongs to Vishay's eSMP® PAR® TVS family - engineered specifically for automotive-grade transient suppression where high-temperature stability, low-profile mounting, and AEC-Q101 validation are mandatory design requirements.
FAQ
What is the exact breakdown voltage tolerance for T4F27AHM3/H?
The T4F27AHM3/H has a guaranteed breakdown voltage range of 25.7 V (minimum) to 28.4 V (maximum) at 1.0 mA test current, per Vishay Document #87645 Table on page 2. This ±5% tolerance ensures consistent clamping behavior across production batches and supports robust design margins for automotive signal line protection.
Is T4F27AHM3/H suitable for bidirectional transient protection?
No, the T4F27AHM3/H is unidirectional only, as explicitly stated in the "FEATURES" section of its datasheet. It protects against positive transients on the cathode side relative to anode (ground). For bidirectional protection, Vishay offers separate part numbers such as the SMBJ26CA series - the T4F27AHM3/H must not be used in AC-coupled or dual-polarity applications.
Does T4F27AHM3/H require special PCB layout considerations?
Yes - the T4F27AHM3/H must be mounted using the recommended footprint from Vishay's DO-219AB outline drawing (Document #S8-V-3915.01-001), with 5.0 mm × 5.0 mm copper pads for optimal thermal dissipation. Short, direct traces to ground and protected line minimize inductance; placement within 2 mm of the protected IC input is critical to maintain clamping effectiveness.
What is the maximum allowable reverse leakage current for T4F27AHM3/H at elevated temperature?
At TJ = 150 °C and VWM = 23.1 V, the T4F27AHM3/H exhibits maximum reverse leakage current of 20 μA, as specified in the "ELECTRICAL CHARACTERISTICS" table on page 2 of Document #87645. This value remains well below typical microcontroller input leakage thresholds, ensuring no functional interference in high-impedance sensor interfaces.
How does the temperature coefficient affect VBR performance of T4F27AHM3/H?
The T4F27AHM3/H has a typical VBR temperature coefficient αT of +0.087 %/°C. Using the formula TJ = VBR at 25 °C × (1 + αT × (TJ − 25)), VBR increases by ~1.2 V at 185 °C - resulting in a final range of ~26.9–29.6 V. This predictable positive drift maintains safe margin above VWM across full operating range.
T4F27AHM3/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):
- 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/H FAQ
1.How can I place an order for T4F27AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F27AHM3/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 T4F27AHM3/H reliable?
The price and inventory of T4F27AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F27AHM3/H is usually 5 days.
3.What payment methods are accepted for T4F27AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F27AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F27AHM3/H?
T4F27AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F27AHM3/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 T4F27AHM3/H?
For technical support, including T4F27AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F27AHM3/H requirements.
6.How does Aetrix verify that T4F27AHM3/H is sourced from the original manufacturer or authorized distributors?
All T4F27AHM3/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 T4F27AHM3/H meets industry standards.
7.What is the process for return or replacement of T4F27AHM3/H?
All T4F27AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with T4F27AHM3/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 T4F27AHM3/H part is unused and in its original packaging.
Return procedure for T4F27AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F27AHM3/H Tags
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