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Vishay General Semiconductor - Diodes Division SM6T24CAHM3/I
- Part No.:
- SM6T24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T24CAHM3/I.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,420
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Product details
Overview
SM6T24CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 24 V standoff voltage (VWM), 33.2 V maximum clamping voltage (VC) at 18 A peak pulse current, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use - deployed in sensor signal line protection and MOSFET gate drive circuits.
For engineers reviewing the SM6T24CAHM3/I datasheet, SM6T24CAHM3/I pinout, SM6T24CAHM3/I application, or SM6T24CAHM3/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, SMB package thermal data, AEC-Q101 qualification status, and direct alternatives for ESD/surge protection design in automotive and industrial systems.
Technical Context
The SM6T24CAHM3/I operates as a symmetrical, bidirectional TVS diode with identical breakdown characteristics in both polarities, enabling robust protection against positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable leakage performance and low capacitance, while the low-inductance SMB package supports fast response to sub-microsecond surges.
Rated for 150 °C maximum junction temperature and meeting J-STD-020 MSL Level 1 (260 °C reflow peak), it sustains repetitive surge events under derated conditions per Fig. 2 and handles non-repetitive 10 ms half-sine forward surges up to 100 A in unidirectional variants - though SM6T24CAHM3/I itself is bidirectional and thus excludes IFSM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20.5 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.8–25.2 V at 1 mA - Measured at specified test current; confirms symmetric bidirectional triggering behavior. |
| VC (Clamping Voltage) | 33.2 V at 18 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; enables downstream IC survival. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability for standardized lightning/surge waveforms per IEC 61000-4-5. |
| IPPM (Peak Pulse Current) | 18 A - Maximum transient current the device safely shunts without degradation; derived from VC and PPPM. |
| TJmax | 150 °C - Maximum allowable junction temperature; sets thermal design limits for PCB copper pad area and ambient derating. |
| Package | SMB (DO-214AA) - Surface-mount outline with 2.2 mm × 3.9 mm footprint; optimized for automated placement and high-volume production. |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
Pinout & Package
SMB (DO-214AA) package: 2-terminal, symmetrical bidirectional device with no polarity marking; terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Identical conduction in both directions; either terminal serves as input or return depending on transient polarity. |
| Case (body) | Thermal and mechanical interface | Non-electrical; transfers heat to PCB copper pads (0.2" × 0.2" recommended); no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| 600 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-earth) surge immunity requirements. |
| AEC-Q101 qualification (HM3 suffix) | Validated for automotive under-hood and infotainment applications requiring extended temperature and lifetime reliability. |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping fidelity. |
| Halogen-free, RoHS-compliant | Complies with environmental regulations for industrial and automotive supply chains; no brominated flame retardants. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground to limit transients to ≤33.2 V. Use Value: Prevents latch-up or damage to 3.3 V/5 V ADC inputs and op-amps while maintaining signal integrity during 10/1000 μs surges up to 18 A. |
Use Scenario: Safeguarding CANH/CANL differential pair against ESD and coupled transients in factory automation nodes. IC Role / Device Role / Timing Role: Paired SM6T24CAHM3/I devices (one across CANH-GND, one across CANL-GND) provide common-mode surge suppression. Use Value: Maintains CAN bus signal integrity during ±25 kV contact ESD (IEC 61000-4-2) and 42 V load dump events without disrupting bit timing. |
| Consumer Power Adapter Input | Telecom DSL Line Interface |
Use Scenario: Secondary-side overvoltage protection in 12 V/24 V wall adapters subjected to lightning-induced surges on DC output lines. IC Role / Device Role / Timing Role: Clamping device placed between regulated output and ground to absorb 600 W transient energy. Use Value: Limits output voltage excursion to 33.2 V during 10/1000 μs surges, protecting downstream USB-PD controllers and load switches. |
Use Scenario: Primary protection for ADSL/VDSL line drivers connected to external telephone wiring susceptible to induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across line driver outputs to suppress longitudinal mode transients. Use Value: Ensures compliance with GR-1089-CORE telecom surge immunity (10/700 μs, 1 kV) while preserving <10 pF junction capacitance for signal bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA | Same VWM (20.5 V), lower PPPM (400 W), SMA package (larger RθJA = 130 °C/W vs. 100 °C/W). | Lower surge handling; suitable only for non-automotive, lower-energy environments. | Select when cost sensitivity outweighs AEC-Q101 requirement and surge levels remain ≤400 W. |
| SMCJ24CA | Same VWM, higher PPPM (1500 W), SMC package (5.3 mm × 7.2 mm), RθJA = 35 °C/W. | Higher power handling but 3× larger footprint; requires more PCB area and thermal relief. | Choose for industrial motor drives or PoE injectors where >600 W surge immunity is mandatory. |
Compared with SMAJ24CA and SMCJ24CA, SM6T24CAHM3/I delivers optimal balance of AEC-Q101 qualification, 600 W surge rating, SMB footprint density, and 100 °C/W thermal resistance - making it the preferred choice for space-constrained automotive and industrial modules requiring validated reliability.
Availability
SM6T24CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, and telecom line interface designs requiring stable component supply, halogen-free compliance, and AEC-Q101 traceability.
Supply support for SM6T24CAHM3/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 protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered for robust transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping performance, AEC-Q101 validation, and surface-mount scalability across voltage grades.
FAQ
What is the clamping voltage of SM6T24CAHM3/I at its rated peak pulse current?
The SM6T24CAHM3/I has a maximum clamping voltage (VC) of 33.2 V when subjected to an 18 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88385 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The clamping performance remains symmetrical in both directions due to its bidirectional construction.
Is SM6T24CAHM3/I suitable for automotive applications?
Yes, SM6T24CAHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD per the AEC-Q101 standard, making it appropriate for automotive sensor interfaces, body control modules, and infotainment power rails where reliability under harsh conditions is required.
What does the "CA" suffix indicate in SM6T24CAHM3/I?
The "CA" suffix in SM6T24CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SM6T24A), SM6T24CAHM3/I has no cathode marking and exhibits identical VBR and VC characteristics regardless of polarity, simplifying layout for AC-coupled or floating signal paths.
What is the thermal resistance of SM6T24CAHM3/I, and how does it affect PCB layout?
The SM6T24CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's package drawing; reducing pad area increases RθJA, risking thermal runaway during repetitive surges. Layout must adhere to specified pad dimensions to maintain rated 600 W pulse capability.
How does SM6T24CAHM3/I compare to unidirectional SM6T24AHM3/I in terms of circuit protection?
SM6T24CAHM3/I provides bidirectional clamping essential for protecting AC signals, differential buses (e.g., CAN, RS-485), or floating nodes, whereas SM6T24AHM3/I is unidirectional and requires correct polarity orientation. Both share identical VWM (20.5 V), VBR (22.8–25.2 V), and PPPM (600 W), but only SM6T24CAHM3/I eliminates polarity-dependent installation errors and supports symmetrical surge suppression without additional components.
SM6T24CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 18A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T24CAHM3/I FAQ
1.How can I place an order for SM6T24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T24CAHM3/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 SM6T24CAHM3/I reliable?
The price and inventory of SM6T24CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T24CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM6T24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T24CAHM3/I?
SM6T24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T24CAHM3/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 SM6T24CAHM3/I?
For technical support, including SM6T24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T24CAHM3/I requirements.
6.How does Aetrix verify that SM6T24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T24CAHM3/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 SM6T24CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM6T24CAHM3/I?
All SM6T24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T24CAHM3/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 SM6T24CAHM3/I part is unused and in its original packaging.
Return procedure for SM6T24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T24CAHM3/I Tags
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