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Vishay General Semiconductor - Diodes Division SM15T24CAHM3/I
- Part No.:
- SM15T24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24CAHM3/I.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,558
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Product details
Overview
SM15T24CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 24 V standoff voltage (VWM), and clamping voltage of 33.2 V at 45.0 A peak pulse current. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and switching transients.
For engineers reviewing the SM15T24CAHM3/I datasheet, SM15T24CAHM3/I pinout, SM15T24CAHM3/I application, or SM15T24CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and verified 1500 W surge handling per JEDEC-standard waveform.
Technical Context
This device operates as a voltage-clamped crowbar during overvoltage events, with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and low dynamic impedance across temperature (-65 °C to +150 °C).
The SM15T24CAHM3/I is thermally optimized for surface-mount applications on 8.0 mm × 8.0 mm copper pads, delivering RθJA = 75 °C/W and RθJL = 15 °C/W. Its failure mode under overstress is a short circuit, consistent with IEC 61000-4-5 Level 4 surge immunity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.8 V / 25.2 V at 1.0 mA - Confirmed breakdown threshold range for bidirectional conduction |
| VC @ IPPM | 33.2 V at 45.0 A (10/1000 μs) - Clamping voltage limiting downstream IC stress during surge |
| PPPM | 1500 W - Peak transient power dissipation capability meeting IEC 61000-4-5 surge test levels |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| Qualification | AEC-Q101 qualified - Validated reliability for automotive electronics per stress-test requirements |
Pinout & Package
SM15T24CAHM3/I uses the SMC (DO-214AB) package: a surface-mount, bidirectional two-terminal device with no polarity marking. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, compliant with JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative half-cycle) | One terminal of symmetrical PN junction; conducts during negative voltage excursions above VBR |
| Cathode | Transient current entry point (positive half-cycle) | Second terminal of symmetrical PN junction; conducts during positive voltage excursions above VBR |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surge testing |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage margin between clamp and protected IC's absolute maximum rating |
| AEC-Q101 qualification (HM3 suffix) | Validated for automotive use including temperature cycling, HTRB, and ESD robustness |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) in engine control modules exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional voltage clamp placed across differential signal pair or supply rail. Use Value: Limits transient voltage to ≤33.2 V during 45 A surges, preventing latch-up or gate oxide damage in connected ASICs. | Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring subject to inductive kickback from solenoids and contactors. IC Role / Device Role: Primary surge suppression element mounted at connector interface before optocoupler or level-shifter. Use Value: Absorbs 1500 W energy without degradation, maintaining <1.0 μA leakage at 24 V to avoid false triggering. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY front-end circuits (e.g., RJ45 magnetics secondary side) from ESD and fast-rising transients. IC Role / Device Role: Secondary-side TVS on low-voltage data lines with matched capacitance and symmetry. Use Value: Symmetrical clamping ensures equal protection for both signal polarities, critical for full-duplex communication integrity. | Use Scenario: Input-stage surge protection in wall-mounted USB-C PD adapters subjected to mains-borne transients per IEC 61000-4-5. IC Role / Device Role: First-line defense across primary-side DC bus before switching controller. Use Value: Withstands repeated 10/1000 μs surges up to 45 A while maintaining thermal stability via 15 °C/W junction-to-lead resistance. |
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 | 600 W peak power (10/1000 μs), same VWM and package but lower surge rating | Not suitable for IEC 61000-4-5 Level 4; limited to Level 2 or consumer-grade systems | Select SMAJ24CA only when system-level surge threat is below 2 kV line-to-ground and board space allows larger derating margin. |
| SMCJ24CA | 3000 W peak power (10/1000 μs), identical VWM, VBR, and SMC package | Higher clamping voltage (38.9 V) and larger thermal mass; requires more PCB copper area | Choose SMCJ24CA where sustained surge repetition or higher ambient temperatures demand greater power headroom. |
Compared with SMAJ24CA and SMCJ24CA, the SM15T24CAHM3/I delivers optimal balance of 1500 W surge capacity, 33.2 V clamping, AEC-Q101 qualification, and halogen-free compliance-making it the preferred choice for cost-sensitive automotive and industrial designs requiring validated reliability without over-engineering.
Availability
SM15T24CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O terminals, and telecom line interface circuits requiring stable component supply with guaranteed long-term sourcing.
Supply support for SM15T24CAHM3/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 high-reliability and automotive-grade performance.
The SM15T Series was developed specifically for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, 1500 W surge capability, and bidirectional symmetry are mandatory.
FAQ
What does the "HM3" suffix indicate in SM15T24CAHM3/I?
The HM3 suffix in SM15T24CAHM3/I denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. This distinguishes it from commercial-grade M3 variants and confirms compliance with automotive reliability standards including temperature cycling, highly accelerated life testing, and electrostatic discharge robustness-critical for deployment in SM15T24CAHM3/I-based engine control or ADAS subsystems.
Is SM15T24CAHM3/I unidirectional or bidirectional?
SM15T24CAHM3/I is a bidirectional transient voltage suppressor, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping in both polarities, making it suitable for protecting AC-coupled signals, differential buses like CAN or RS-485, and floating power domains where polarity reversal may occur during transients.
What is the maximum clamping voltage of SM15T24CAHM3/I under surge conditions?
The maximum clamping voltage of SM15T24CAHM3/I is 33.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 45.0 A. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does SM15T24CAHM3/I require heatsinking for standard operation?
No external heatsink is required for SM15T24CAHM3/I under typical single-pulse surge conditions, as its thermal design relies on PCB copper pad area (minimum 8.0 mm × 8.0 mm per terminal) to dissipate energy. The specified RθJA = 75 °C/W assumes this layout; exceeding repetitive surge duty cycles or ambient temperatures >85 °C may necessitate additional copper pour.
How does SM15T24CAHM3/I compare to SM15T24A in terms of functionality?
SM15T24CAHM3/I is the bidirectional, AEC-Q101-qualified, halogen-free variant of the SM15T24A family. While SM15T24A is unidirectional and typically commercial-grade (E3/M3), SM15T24CAHM3/I adds symmetrical clamping, automotive qualification, and environmental compliance-making SM15T24CAHM3/I the appropriate choice for safety-critical or regulated applications where SM15T24A would be insufficient.
SM15T24CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, 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):
- 45A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SM15T24CAHM3/I FAQ
1.How can I place an order for SM15T24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24CAHM3/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 SM15T24CAHM3/I reliable?
The price and inventory of SM15T24CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T24CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM15T24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24CAHM3/I?
SM15T24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24CAHM3/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 SM15T24CAHM3/I?
For technical support, including SM15T24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24CAHM3/I requirements.
6.How does Aetrix verify that SM15T24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T24CAHM3/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 SM15T24CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM15T24CAHM3/I?
All SM15T24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24CAHM3/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 SM15T24CAHM3/I part is unused and in its original packaging.
Return procedure for SM15T24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T24CAHM3/I Tags
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