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Vishay General Semiconductor - Diodes Division T4F39AHM3/I
- Part No.:
- T4F39AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F39AHM3/I.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:19,900
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Product details
Overview
T4F39AHM3/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 39.0 V nominal breakdown voltage (VBR), 33.3 V stand-off voltage (VWM), 53.9 V maximum clamping voltage (VC) at 7.4 A peak pulse current, 400 W peak pulse power (10/1000 µs), and operates up to +185 °C junction temperature - deployed on signal lines of automotive sensor units against inductive switching transients.
For engineers reviewing the T4F39AHM3/I datasheet, T4F39AHM3/I pinout, T4F39AHM3/I application, or T4F39AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, SMF (DO-219AB) package compatibility, unidirectional polarity with cathode band marking, and thermal robustness under high-reliability automotive operating conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for low-leakage, stable clamping performance across -65 °C to +185 °C. Its junction passivation and halogen-free HM3 suffix ensure compliance with AEC-Q101, JESD201 Class 2 whisker resistance, and MSL Level 1 reflow capability up to 260 °C.
The device delivers precise transient suppression with 0.091 %/°C temperature coefficient of VBR, enabling predictable voltage clamping behavior in high-temperature engine bay or ADAS subsystems. Its 135–160 °C/W junction-to-ambient thermal resistance supports reliable operation on standard FR4 PCBs with 2 oz copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 39.0 V - ensures reliable triggering above system operating voltage while avoiding false conduction during normal transients |
| VWM | 33.3 V - maximum continuous reverse voltage the device blocks without significant leakage (<1 μA at 25 °C) |
| VC @ IPPM | 53.9 V - clamps surge events to a safe level for downstream ICs and MOSFETs during 400 W, 10/1000 µs pulses |
| IPPM | 7.4 A - peak surge current handling capacity under standardized waveform, validated per ANSI/IEEE C62.35 |
| TJ max. | +185 °C - enables deployment in under-hood automotive environments without derating penalties |
| Package | SMF (DO-219AB) - low-profile, wave/reflow solderable case with 3.9 mm × 2.7 mm footprint and cathode band polarity marking |
| AEC-Q101 | Qualified - certified for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling |
Pinout & Package
Package: SMF (DO-219AB), surface-mount, single-ended unidirectional configuration. Cathode denoted by color band; anode is opposite end. Compatible with JEDEC-standard SOD-123W footprint layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; connected to protected circuit ground or low-side reference | Provides return path for clamped surge current; must be routed with low-inductance connection to minimize VL overshoot |
| Cathode | Current exit terminal during reverse-bias clamping; connected to line being protected | Acts as the high-impedance input node until VBR is exceeded; marked by visible band for assembly verification |
Key Features
| Feature | Design Value |
|---|---|
| 185 °C junction rating | Enables uninterrupted operation in engine control modules and transmission ECUs where ambient temperatures exceed 125 °C |
| AEC-Q101 qualification | Validates reliability for automotive safety-critical systems without requiring additional qualification testing by OEMs |
| 400 W peak pulse power (10/1000 µs) | Protects CAN, LIN, and sensor signal lines against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges |
| 0.091 %/°C VBR tempco | Minimizes drift in clamping threshold across wide temperature ranges, ensuring consistent protection margin in cold cranking and hot soak |
| Halogen-free, RoHS-compliant HM3 suffix | Meets automotive material compliance standards (e.g., GMW3172, Ford WSS-M99P9999-A1) and supports lead-free manufacturing |
Applications
| Automotive Sensor Signal Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors exposed to load-dump and inductive kickback in chassis modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed directly at sensor connector interface to shunt transients before reaching ADC front-end or signal conditioning amplifier. Use Value: Limits voltage excursion to ≤53.9 V during 7.4 A surges, preserving sensor accuracy and preventing latch-up in 3.3 V or 5 V signal chains. |
Use Scenario: Safeguarding 12 V supply rails feeding microcontrollers and driver ICs in powertrain ECUs subject to ISO 16750-2 load dump events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, coordinated with upstream fuse and secondary TVS for staged protection. Use Value: Withstands 400 W pulses without degradation, maintaining <1 μA leakage at 33.3 V to avoid battery drain in sleep mode. |
| ADAS Camera Module Interface | Body Control Module (BCM) LIN Bus |
Use Scenario: Shielding MIPI CSI-2 and FPD-Link III data lines in surround-view camera systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to connector to suppress fast transients while minimizing signal integrity impact. Use Value: Clamps sub-100 ns ESD events to <54 V with minimal parasitic capacitance, preserving high-speed video timing margins. |
Use Scenario: Protecting LIN transceivers and microcontroller GPIOs in door modules and lighting controllers from battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN bus line (dominant/recessive side) referenced to local ground plane. Use Value: Provides AEC-Q101-certified protection with 33.3 V stand-off, ensuring no false dominant state during normal 12 V bus operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A-E3/57T (Vishay) | Higher VWM = 36.0 V, lower VC = 58.1 V at 6.9 A, same SMF package but non-AEC-Q101 rated | Not qualified for automotive use; suitable for industrial/commercial systems with less stringent reliability requirements | Select when AEC-Q101 is not mandated and higher VWM margin is needed for 36 V nominal systems |
| TPSMD36CA (Texas Instruments) | Bidirectional configuration, VWM = 36.0 V, VC = 58.1 V at 6.9 A, AEC-Q101 qualified, same DO-219AB package | Supports AC-coupled or bidirectional signal lines (e.g., USB, RS-485); requires polarity-aware layout for unidirectional use | Choose for designs needing bidirectional protection or where TI's enhanced ESD immunity (±30 kV contact) is prioritized |
Compared with SMAJ36A-E3/57T and TPSMD36CA, the T4F39AHM3/I offers tighter VBR tolerance (±5 %), lower leakage at elevated temperature, and guaranteed 185 °C operation - making it optimal for high-temperature automotive signal-line protection where unidirectional clamping and long-term reliability are critical.
Availability
T4F39AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, engine control unit (ECU) power inputs, and ADAS camera interface circuits requiring stable component supply, AEC-Q101 compliance, and high-temperature operational assurance.
Supply support for T4F39AHM3/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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The T4F39AHM3/I belongs to Vishay's eSMP® PAR® TVS family, engineered specifically for high-temperature, high-reliability automotive electronics - delivering robust transient suppression in space-constrained, thermally demanding environments.
FAQ
What is the exact breakdown voltage range for T4F39AHM3/I?
The T4F39AHM3/I has a specified breakdown voltage (VBR) range of 37.1 V (min) to 41.0 V (max) at 1.0 mA test current, with a nominal value of 39.0 V. This range is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 14-Feb-2023. The T4F39AHM3/I maintains this specification across its full operating temperature range, supported by a 0.091 %/°C temperature coefficient.
Is T4F39AHM3/I compatible with lead-free reflow soldering processes?
Yes, the T4F39AHM3/I is fully compatible with lead-free reflow soldering, meeting J-STD-020 MSL Level 1 requirements with a maximum peak temperature of 260 °C. Its matte tin-plated terminals and halogen-free molding compound ensure reliable wetting and intermetallic formation during standard Pb-free thermal profiles, as verified in Vishay's qualification testing.
Does T4F39AHM3/I have AEC-Q101 qualification documentation available?
Yes, the T4F39AHM3/I carries full AEC-Q101 qualification, explicitly stated in the Vishay datasheet (Document Number: 87645, Revision: 14-Feb-2023). Qualification includes HTGB, HTRB, temperature cycling, and mechanical shock tests per the AEC-Q101 standard - applicable to the HM3 suffix variant used in T4F39AHM3/I.
What is the maximum clamping voltage of T4F39AHM3/I under surge conditions?
The T4F39AHM3/I exhibits a maximum clamping voltage (VC) of 53.9 V at 7.4 A peak pulse current (IPPM) using the standardized 10/1000 µs waveform. This value is measured per figure 3 in the datasheet and represents the upper limit of voltage seen by protected circuitry during worst-case transient events.
Can T4F39AHM3/I be used in bidirectional signal protection applications?
No, the T4F39AHM3/I is unidirectional only, as clearly specified in the Vishay datasheet. It conducts only when the cathode is positive relative to the anode. For bidirectional protection (e.g., AC lines or differential buses), a different part such as the TPSMD36CA or a dual-diode configuration would be required - the T4F39AHM3/I must be oriented correctly with cathode toward the protected line.
T4F39AHM3/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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- 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)
T4F39AHM3/I FAQ
1.How can I place an order for T4F39AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F39AHM3/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 T4F39AHM3/I reliable?
The price and inventory of T4F39AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F39AHM3/I is usually 5 days.
3.What payment methods are accepted for T4F39AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F39AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F39AHM3/I?
T4F39AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F39AHM3/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 T4F39AHM3/I?
For technical support, including T4F39AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F39AHM3/I requirements.
6.How does Aetrix verify that T4F39AHM3/I is sourced from the original manufacturer or authorized distributors?
All T4F39AHM3/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 T4F39AHM3/I meets industry standards.
7.What is the process for return or replacement of T4F39AHM3/I?
All T4F39AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with T4F39AHM3/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 T4F39AHM3/I part is unused and in its original packaging.
Return procedure for T4F39AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F39AHM3/I Tags
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