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Vishay General Semiconductor - Diodes Division SM15T24CAHM3/H
- Part No.:
- SM15T24CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24CAHM3/H.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,679
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Product details
Overview
SM15T24CAHM3/H 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 A peak pulse current. It provides robust protection for automotive-grade signal lines and power rails against lightning-induced and switching transients.
For engineers reviewing the SM15T24CAHM3/H datasheet, SM15T24CAHM3/H pinout, SM15T24CAHM3/H application, or SM15T24CAHM3/H equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, halogen-free RoHS compliance, and verified 1500 W surge capability under standardized waveform conditions.
Technical Context
This device operates as a voltage-clamped crowbar during overvoltage events, with symmetrical breakdown characteristics in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at 20.5 V) and low dynamic impedance, enabling fast response to transients down to sub-microsecond rise times.
The SM15T24CAHM3/H is thermally optimized for surface-mount applications with RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C. Its MSL Level 1 rating and 260 °C lead-free reflow compatibility confirm suitability for high-volume automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.5 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin below clamping threshold. |
| VBR min/max | 22.8 V / 25.2 V - Verified breakdown occurs within this band at 1 mA test current; ensures predictable turn-on across production lot. |
| VC @ IPPM | 33.2 V @ 45 A - Clamping voltage measured under 10/1000 μs surge; limits downstream voltage stress during worst-case transient. |
| PPPM | 1500 W - Peak pulse power handling per JEDEC standard; supports protection against lightning surges and inductive kickback. |
| TJ max | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive environments without derating. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
SM15T24CAHM3/H uses a two-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Terminals are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Conducts surge current when voltage exceeds VBR in positive direction; symmetric with cathode for bidirectional clamping. |
| Cathode | Transient current entry point (negative half-cycle) | Conducts surge current when voltage exceeds VBR in negative direction; functionally identical to anode in CA-suffix devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns-no external rectification needed. |
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling-supports ASIL-B system integration. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IEC 61249-2-21; eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| Low clamping ratio (VC/VBR) | 1.31 typical (33.2 V / 25.2 V) - Minimizes overvoltage overshoot during surge events, reducing risk of IC latch-up or gate oxide damage. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Transceiver Protection |
|---|---|
Use Scenario: Protecting LIN/CAN physical layer transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between transceiver I/O pins and connector interface to limit transient excursions to <33.2 V. Use Value: Prevents permanent damage to 5 V or 3.3 V transceivers by clamping surges exceeding ±40 V while maintaining signal integrity during normal operation. | Use Scenario: Safeguarding RS-485/CAN FD differential bus lines in factory automation controllers exposed to ESD and inductive switching noise from solenoids and motor drives. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, absorbing common-mode surges up to 1500 W without affecting differential signaling. Use Value: Enables >25 kV ESD immunity (IEC 61000-4-2) and 1 kV surge immunity (IEC 61000-4-5) on industrial fieldbus nodes without adding series impedance. |
| Telecom Power Input Protection | Consumer USB-C Port Surge Suppression |
Use Scenario: Shielding 24 V DC input rails of PoE-powered network switches and base station radios from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS mounted at board edge, shunting surge energy before it reaches DC-DC converters and PMICs. Use Value: Absorbs 1500 W pulses without failure, maintaining short-circuit fail-safe mode to prevent fire hazard or secondary component destruction. | Use Scenario: Adding transient immunity to USB-C receptacles in portable monitors and docking stations where hot-plug events and cable-bend-induced ESD occur frequently. IC Role / Device Role / Timing Role: Bidirectional clamp across VBUS and GND, sized to handle 10/1000 μs surges up to 45 A while fitting tight SMC footprint constraints. Use Value: Achieves USB-IF compliance for surge immunity without increasing PCB area or requiring discrete capacitor filtering stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA | 600 W peak pulse power (10/1000 μs); same VWM (20.5 V) but lower IPPM (24.4 A); SMA package (smaller thermal mass). | Limited to lower-energy threats (e.g., ESD-only); unsuitable for lightning or motor-switching transients. | Select when cost and board space are critical and surge threat level is classified as IEC 61000-4-2 only. |
| SMCJ24CA | 3000 W peak pulse power; same VWM and VC; larger SMC package with higher thermal inertia and RθJA = 40 °C/W. | Overqualified for most 24 V systems; requires larger pad layout and may not fit constrained layouts. | Select when system-level testing reveals margin shortfall with 1500 W rating or when extended lifetime under repeated surges is required. |
Compared with SMAJ24CA and SMCJ24CA, the SM15T24CAHM3/H delivers optimal balance of surge robustness, automotive qualification, and compact SMC footprint-making it the preferred choice for AEC-Q101-compliant 24 V systems where 1500 W protection is validated as sufficient.
Availability
SM15T24CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, telecom power inputs, and consumer USB-C port protection requiring stable component supply and long-term lifecycle support.
Supply support for SM15T24CAHM3/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, automotive qualification, and high-power handling.
The SM15T Series was developed specifically for high-energy transient suppression in harsh environments, targeting AEC-Q101-compliant automotive, industrial control, and telecommunications infrastructure applications.
FAQ
What does the "HM3" suffix indicate in SM15T24CAHM3/H?
The "HM3" suffix in SM15T24CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates the packaging format (7-inch tape and reel), and "M3" confirms halogen-free molding compound meeting IEC 61249-2-21 standards-critical for automotive and green-electronics compliance.
Is SM15T24CAHM3/H suitable for protecting 24 V DC power supplies?
Yes, SM15T24CAHM3/H is explicitly rated for 20.5 V standoff (VWM) and 33.2 V clamping at 45 A, making it appropriate for 24 V nominal DC systems. Its 1500 W surge rating handles load-dump transients per ISO 7637-2 Pulse 5a and meets requirements for industrial 24 V power rail protection.
Does SM15T24CAHM3/H have polarity markings on the package?
No, SM15T24CAHM3/H has no polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SM15T24A), the CA-suffix device functions identically in both directions-eliminating orientation concerns during automated placement.
What is the maximum junction temperature rating for SM15T24CAHM3/H?
The maximum junction temperature (TJ) for SM15T24CAHM3/H is +150 °C, as specified in the Vishay SM15T Series datasheet (Document Number: 88380). This allows uninterrupted operation in under-hood automotive environments and high-ambient industrial settings without thermal shutdown.
How does SM15T24CAHM3/H compare to unidirectional SM15T24AHM3/H in circuit design?
SM15T24CAHM3/H replaces two unidirectional devices in AC or floating applications, simplifying layout and reducing BOM count. While both share identical VWM, VBR, and VC specs, only the CA version provides symmetrical clamping-essential for protecting differential pairs, transformer-coupled interfaces, or dual-rail sensors.
SM15T24CAHM3/H 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/H FAQ
1.How can I place an order for SM15T24CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24CAHM3/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 SM15T24CAHM3/H reliable?
The price and inventory of SM15T24CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T24CAHM3/H is usually 5 days.
3.What payment methods are accepted for SM15T24CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24CAHM3/H?
SM15T24CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24CAHM3/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 SM15T24CAHM3/H?
For technical support, including SM15T24CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24CAHM3/H requirements.
6.How does Aetrix verify that SM15T24CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SM15T24CAHM3/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 SM15T24CAHM3/H meets industry standards.
7.What is the process for return or replacement of SM15T24CAHM3/H?
All SM15T24CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24CAHM3/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 SM15T24CAHM3/H part is unused and in its original packaging.
Return procedure for SM15T24CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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