My Inquiry
My Account
Vishay General Semiconductor - Diodes Division T4F24AHM3/I
- Part No.:
- T4F24AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
T4F24AHM3/I.pdf
- Description:
- LOW PROFILE OF 400W PAR TVS PROD
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
T4F24AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the eSMP® Series, designed for automotive-grade overvoltage protection. It features a 24.0 V nominal breakdown voltage (VBR), 20.5 V stand-off voltage (VWM), 33.2 V maximum clamping voltage (VC) at 12.0 A peak pulse current, 400 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood sensor line protection.
For engineers reviewing the T4F24AHM3/I datasheet, T4F24AHM3/I pinout, T4F24AHM3/I application, or T4F24AHM3/I equivalent, key selection criteria include its 185 °C junction temperature rating, SMF (DO-219AB) package compatibility, unidirectional polarity with cathode band marking, and low leakage (<1.0 µA at VWM) under high-temperature operating conditions.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-reliability automotive environments. Its junction passivation enables stable operation up to TJ = 185 °C and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak tolerance.
The device delivers precise clamping performance with a typical VBR temperature coefficient of +0.085 %/°C and thermal resistance RthJM as low as 15 °C/W, supporting robust surge immunity in compact SOD-123W-compatible layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (Nominal) | 24.0 V - Ensures reliable triggering above system operating voltage while avoiding false trips during transients |
| VWM | 20.5 V - Maximum continuous reverse voltage before leakage exceeds 1.0 µA at 25 °C |
| VC @ IPPM | 33.2 V - Clamps 12.0 A surge (10/1000 µs) to protect downstream ICs and MOSFETs |
| PPPM | 400 W - Sustains high-energy transients common in automotive load-dump and inductive switching events |
| TJ max. | 185 °C - Enables placement near hot engine-control units without derating loss |
| Package | SMF (DO-219AB) - Low-profile 2.9 mm × 1.3 mm footprint compatible with SOD-123W PCB land patterns |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: SMF (DO-219AB), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path in unidirectional clamp configuration |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected signal/power line; color band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature junction capability | Rated for continuous operation up to 185 °C, eliminating derating concerns in under-hood applications |
| AEC-Q101 qualification | Validated across temperature cycling, humidity, and high-temperature reverse bias tests for automotive reliability |
| Low clamping ratio (VC/VBR) | 1.38 - Minimizes overvoltage stress on protected components during surge events |
| Halogen-free & RoHS-compliant | HM3 suffix denotes compliance with environmental standards and JESD201 Class 2 whisker resistance |
| Wave and reflow solderable | Compatible with standard lead-free reflow profiles up to 260 °C peak, per J-STD-020 MSL Level 1 |
Applications
| Automotive Sensor Protection | Power Line Surge Suppression |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from ESD and load-dump transients in engine control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between signal line and ground, triggered only during positive overvoltage events. Use Value: Limits transient voltage to ≤33.2 V at 12 A, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. | Use Scenario: Safeguarding 24 V supply rails in body control modules against ISO 7637-2 Pulse 1/2a/5a surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input, absorbing up to 400 W for 1 ms without failure. Use Value: Maintains VWM = 20.5 V to avoid interference with normal 24 V regulation while clamping spikes above 24 V. |
| Industrial Motor Drive I/O | Automotive Lighting Control |
Use Scenario: Shielding microcontroller GPIOs and optocoupler inputs from inductive kickback in relay-driven HVAC actuators. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor placed at connector interface, shunting surge energy to chassis ground. Use Value: Delivers <1.0 µA leakage at 20.5 V, ensuring minimal impact on high-impedance sensing circuits during normal operation. | Use Scenario: Protecting LED driver ICs and PWM dimming lines in adaptive front lighting systems (AFS) exposed to battery transients. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control signals, coordinated with primary rail clamping. Use Value: Supports 185 °C operation, enabling direct mounting on thermally stressed LED driver PCBs without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57T (Vishay) | Same VBR (24 V), but SMA (DO-214AC) package; higher RthJA (150 °C/W vs. 135 °C/W); 400 W rating retained | Larger footprint (4.5 mm × 2.7 mm) requires PCB redesign; less suitable for space-constrained automotive modules | Select when existing SMA layout exists and thermal margin permits higher junction rise |
| 1.5SMC24A (ON Semiconductor) | Same VBR and PPPM, but SMC (DO-214AB) package; not AEC-Q101 qualified; RthJM ~17 °C/W | Not approved for automotive use; limited to industrial/commercial designs where qualification is not required | Choose only for cost-sensitive non-automotive applications with relaxed reliability requirements |
Compared with SMAJ24A-E3/57T and 1.5SMC24A, the T4F24AHM3/I offers superior thermal performance in a smaller footprint and mandatory AEC-Q101 validation-critical for automotive ECUs where space, temperature, and qualification are co-constrained.
Availability
T4F24AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, 24 V power rail surge suppression, and industrial motor drive I/O requiring stable component supply across production lifecycles.
Supply support for T4F24AHM3/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, MOSFETs, and TVS devices with emphasis on reliability and automotive qualification.
The T4F24AHM3/I belongs to Vishay's eSMP® PAR® TVS family, engineered specifically for high-temperature, high-reliability transient suppression in automotive and industrial control systems.
FAQ
What is the maximum clamping voltage of the T4F24AHM3/I at its rated peak pulse current?
The T4F24AHM3/I has a maximum clamping voltage (VC) of 33.2 V when subjected to its rated 12.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 3 in the Vishay datasheet 87645 and ensures downstream components remain within safe voltage limits during surge events. The T4F24AHM3/I maintains this clamping performance across its full operating temperature range.
Is the T4F24AHM3/I qualified for automotive applications?
Yes, the T4F24AHM3/I is AEC-Q101 qualified, having passed all required stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). Its 185 °C maximum junction temperature and MSL Level 1 rating further validate its suitability for under-hood automotive electronics. The T4F24AHM3/I is explicitly listed in Vishay's qualified parts list for automotive use.
What package type does the T4F24AHM3/I use, and how does it compare to SOD-123W?
The T4F24AHM3/I uses the SMF (DO-219AB) package-a low-profile surface-mount case measuring 2.9 mm × 1.3 mm. It is mechanically and thermally compatible with SOD-123W footprints per Vishay's documentation, allowing drop-in replacement in many designs. The T4F24AHM3/I's SMF package provides lower thermal resistance (RthJM = 15 °C/W) than standard SOD-123W variants, enhancing power handling in constrained layouts.
What is the reverse leakage current specification for the T4F24AHM3/I at its stand-off voltage?
At its 20.5 V stand-off voltage (VWM) and 25 °C ambient temperature, the T4F24AHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 µA. At elevated temperatures (TJ = 150 °C), leakage remains ≤20 µA-well within design margins for high-impedance sensor interfaces. This low leakage ensures minimal power loss and signal distortion in always-on automotive subsystems using the T4F24AHM3/I.
Does the T4F24AHM3/I have a defined polarity marking, and how is it identified?
Yes, the T4F24AHM3/I features a visible cathode band on the package body to denote polarity. As a unidirectional TVS, correct orientation is critical: the cathode must connect to the protected line, and the anode to ground. This marking aligns with JEDEC DO-219AB mechanical drawings and is verified in Vishay's package outline diagrams. Misorientation of the T4F24AHM3/I will prevent proper clamping function.
T4F24AHM3/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):
- 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/I FAQ
1.How can I place an order for T4F24AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for T4F24AHM3/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 T4F24AHM3/I reliable?
The price and inventory of T4F24AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4F24AHM3/I is usually 5 days.
3.What payment methods are accepted for T4F24AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4F24AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4F24AHM3/I?
T4F24AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4F24AHM3/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 T4F24AHM3/I?
For technical support, including T4F24AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4F24AHM3/I requirements.
6.How does Aetrix verify that T4F24AHM3/I is sourced from the original manufacturer or authorized distributors?
All T4F24AHM3/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 T4F24AHM3/I meets industry standards.
7.What is the process for return or replacement of T4F24AHM3/I?
All T4F24AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with T4F24AHM3/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 T4F24AHM3/I part is unused and in its original packaging.
Return procedure for T4F24AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T4F24AHM3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
