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Vishay General Semiconductor - Diodes Division SM6T24CAHM3_B/H
- Part No.:
- SM6T24CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T24CAHM3_B/H.pdf
- Description:
- 600W,24V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,354
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Product details
Overview
SM6T24CAHM3_B/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 24 V standoff voltage (VWM), 33.2 V clamping voltage (VC) at 18 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It provides robust ESD and surge protection for automotive sensor signal lines, industrial I/O interfaces, and power supply rails.
For engineers reviewing the SM6T24CAHM3_B/H datasheet, SM6T24CAHM3_B/H pinout, SM6T24CAHM3_B/H application, or SM6T24CAHM3_B/H equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VWM ≈ 1.38), and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM), while the SMB package supports automated SMT placement and meets J-STD-020 MSL Level 1.
The device delivers 600 W peak pulse power handling per 10/1000 μs waveform when mounted on 5.0 mm × 5.0 mm copper pads, with clamping performance validated at 18 A IPPM and thermal derating above 25 °C per Fig. 2. It is qualified to AEC-Q101 for automotive use and features halogen-free molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.5 V - maximum reverse stand-off voltage before clamping begins; defines operating margin below breakdown |
| VBR (min/max) | 22.8 V / 25.2 V - breakdown occurs within this range at 1 mA test current; ensures consistent turn-on threshold |
| VC @ IPPM | 33.2 V at 18 A - clamping voltage during 10/1000 μs surge; limits downstream voltage stress |
| PPPM | 600 W - peak pulse power capability; determines survivability against lightning or inductive switch transients |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient; requires minimum 5.0 mm × 5.0 mm copper pad for rated power |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | One terminal of symmetrical PN junction; conducts during negative surges relative to cathode reference |
| Cathode | Transient current entry (positive half-cycle) | Second terminal of symmetrical PN junction; conducts during positive surges; no band marking on bidirectional units |
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 | Withstands IEC 61000-4-5 Level 4 (4 kV) surges when properly laid out on PCB |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Low clamping ratio (VC/VWM = 1.38) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio alternatives |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; no baking required prior to assembly |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within nanoseconds to transients exceeding VWM. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs by limiting excursion to ≤33.2 V during 18 A surges. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Transient shunt connected across input terminals, diverting surge energy away from optocoupler or microcontroller GPIO pins. Use Value: Maintains functional safety integrity by ensuring input logic states remain valid during 600 W transient events. |
| Telecom Line Interface | Power Supply Rail Clamping |
Use Scenario: Shielding Ethernet PHY front-end circuitry and PoE injectors from ESD (IEC 61000-4-2 ±8 kV contact) and induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp integrated into common-mode choke output stage, referenced to local ground plane. Use Value: Achieves system-level compliance without additional series impedance or filtering components. | Use Scenario: Suppressing switching noise and inductive kickback on 24 V DC power rails feeding motor drivers or solenoid controllers. IC Role / Device Role / Timing Role: Parallel-connected rail clamp between VCC and GND, activated only during overvoltage excursions beyond 20.5 V. Use Value: Extends lifetime of downstream DC-DC converters and MOSFET gate drivers by limiting transient overvoltage stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Same SMB package, 24 V VWM, but rated for 600 W with 10/1000 μs waveform and RθJA = 110 °C/W; not AEC-Q101 qualified | Targeted at commercial/industrial use; lacks automotive qualification and halogen-free certification | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive compliance |
| 1.5KE24CA | Through-hole DO-201 package, same 24 V VWM and bidirectional function, but larger footprint and lower mounting density; 600 W rating with same waveform | Suitable for legacy designs or high-reliability power supplies where manual assembly or thermal mass is preferred | Choose when board space allows through-hole mounting and thermal inertia improves surge endurance in non-SMT environments |
Compared with SMBJ24CA and 1.5KE24CA, SM6T24CAHM3_B/H offers AEC-Q101 qualification, halogen-free construction, and tighter thermal resistance (100 vs. 110 °C/W), making it optimal for space-constrained automotive modules requiring zero-bake assembly and long-term environmental compliance.
Availability
SM6T24CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor systems, industrial PLC I/O modules, telecom line interfaces, and 24 V DC power rail protection requiring stable component supply and full lifecycle traceability.
Supply support for SM6T24CAHM3_B/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is designed specifically for high-energy transient suppression in automotive, industrial, and communications equipment, balancing compact SMB packaging with AEC-Q101 qualification and 600 W surge capability.
FAQ
What is the clamping voltage of SM6T24CAHM3_B/H at its rated peak pulse current?
The SM6T24CAHM3_B/H has a maximum clamping voltage (VC) of 33.2 V at 18 A peak pulse current (IPPM) under the standard 10/1000 μs waveform condition. This value is measured with the device mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per the Vishay datasheet. The clamping performance directly protects downstream 24 V-rated ICs by limiting transient overvoltage to a safe margin above VWM.
Is SM6T24CAHM3_B/H suitable for automotive applications?
Yes, SM6T24CAHM3_B/H is AEC-Q101 qualified and designated with the HM3 suffix, indicating halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification. This makes SM6T24CAHM3_B/H appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under harsh conditions is mandatory.
What does the "CA" suffix indicate in SM6T24CAHM3_B/H?
The "CA" suffix in SM6T24CAHM3_B/H denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM6T24AHM3_B/H), SM6T24CAHM3_B/H has no cathode marking and functions identically in either polarity-ideal for protecting AC-coupled lines, differential buses, or floating references where polarity cannot be assumed.
What is the thermal resistance of SM6T24CAHM3_B/H, and how does it affect layout?
SM6T24CAHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 5.0 mm × 5.0 mm copper pad per terminal. This value assumes standard FR-4 PCB with no internal planes. To achieve rated 600 W pulse power, designers must implement minimum pad dimensions and avoid excessive trace length or isolation. Lower RθJA improves surge survivability and reduces thermal runaway risk during repetitive events.
How does SM6T24CAHM3_B/H differ from SM6T24AHM3_B/H?
SM6T24CAHM3_B/H is bidirectional (CA), while SM6T24AHM3_B/H is unidirectional (A). The CA version clamps both polarities and has no polarity marking; the A version has a cathode band and only clamps positive transients relative to cathode. Electrically, their VWM, VBR, and VC values are identical, but circuit integration differs: CA suits floating or AC signals, whereas A requires correct orientation on DC rails. Both share AEC-Q101 qualification and halogen-free HM3 construction.
SM6T24CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Telecom
- 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_B/H FAQ
1.How can I place an order for SM6T24CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T24CAHM3_B/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 SM6T24CAHM3_B/H reliable?
The price and inventory of SM6T24CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T24CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T24CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T24CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T24CAHM3_B/H?
SM6T24CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T24CAHM3_B/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 SM6T24CAHM3_B/H?
For technical support, including SM6T24CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T24CAHM3_B/H requirements.
6.How does Aetrix verify that SM6T24CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T24CAHM3_B/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 SM6T24CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T24CAHM3_B/H?
All SM6T24CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T24CAHM3_B/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 SM6T24CAHM3_B/H part is unused and in its original packaging.
Return procedure for SM6T24CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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