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Vishay General Semiconductor - Diodes Division SM15T24AHM3/H
- Part No.:
- SM15T24AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24AHM3/H.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,907
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Product details
Overview
SM15T24AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 20.5 V stand-off voltage (VWM), 22.8–25.2 V breakdown voltage (VBR), and clamps to ≤33.2 V at 45 A peak pulse current. It protects MOSFETs and signal lines in automotive power electronics against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T24AHM3/H datasheet, SM15T24AHM3/H pinout, SM15T24AHM3/H application, or SM15T24AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and low-inductance SMC package optimized for high-energy transient suppression in space-constrained PCB layouts.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds VBR, limiting transient energy by diverting surge current away from protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive stress.
The SM15T24AHM3/H is designed for single-polarity protection with cathode-band marking, supports 200 A non-repetitive forward surge current (10 ms half-sine), and exhibits 75 °C/W junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads - enabling robust thermal performance without heatsinking in typical automotive and industrial I/O line placements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.5 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets upper limit for normal circuit operation. |
| VBR (min/max) | 22.8 V / 25.2 V at 1.0 mA test current - defines precise avalanche onset range for predictable clamping behavior. |
| VC @ IPPM | ≤33.2 V at 45 A (10/1000 μs) - clamping voltage during worst-case surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - peak pulse power handling capability; validates suitability for lightning and motor-switching threats per IEC 61000-4-5. |
| TJ max | 150 °C - maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC-Q101 Rev D. |
Pinout & Package
SM15T24AHM3/H uses the SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, UL 94 V-0 flammability rating, and polarity indicated by a cathode band on the body. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail or sensor output); avalanche conduction initiates here when VWM is exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against severe transients including IEC 61000-4-5 Level 4 (4 kV/2 Ω) without derating in standard PCB layout. |
| Glass-passivated junction | Ensures stable VBR tolerance and low parameter drift over temperature and lifetime, critical for automotive safety-critical systems. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) and simplifies end-of-life recycling. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping response for high-speed data lines. |
Applications
| Automotive Power Distribution | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails and load-dump-sensitive circuits in engine control units and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and downstream DC-DC converters or microcontrollers. Use Value: Limits load-dump spikes (up to 60 V/100 ms) to ≤33.2 V, preventing latch-up or permanent damage to 3.3 V/5 V logic interfaces. |
Use Scenario: Shielding encoder feedback lines and analog sensor inputs from switching noise generated by 3-phase inverters. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on differential RS-485 or analog voltage outputs of position sensors. Use Value: Clamps 1 kV/500 A surges (IEC 61000-4-5) within 1 ns, preserving signal integrity and avoiding false triggering in closed-loop motion control. |
| Telecom Power Interface | Consumer Appliance Control Board |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports and auxiliary 24 V DC inputs against induced surges from nearby AC mains wiring. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC input before isolation barrier or LDO regulator. Use Value: Absorbs 1500 W pulses without degradation, maintaining >100 k-cycle surge endurance required for telecom infrastructure uptime. |
Use Scenario: Guarding microcontroller GPIOs and relay driver outputs in smart HVAC controllers exposed to HVAC coil back-EMF. IC Role / Device Role / Timing Role: Localized TVS adjacent to each inductive load driver IC to localize energy dissipation. Use Value: Prevents MCU reset or firmware corruption caused by 600 V/100 A transients from contactor switching, meeting IEC 61000-4-4 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57T | Same VWM/VBR range but lower PPPM (400 W), SMA package (smaller footprint, higher RθJA). | Limited to lower-energy threats (e.g., ESD, minor switching noise); unsuitable for load-dump or lightning surges. | Select only for cost-sensitive consumer designs where surge threat level is classified ≤IEC 61000-4-5 Level 2. |
| SMCJ24A-QH | Identical 1500 W rating and SMC package, but AEC-Q101 qualified with QH suffix (not HM3); halogen content not specified. | Approved for automotive use but lacks documented halogen-free status; may fail OEM material declarations. | Prefer SM15T24AHM3/H when halogen-free compliance and full AEC-Q101 traceability are contractually mandated. |
Compared with SMAJ24A-E3/57T and SMCJ24A-QH, SM15T24AHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and guaranteed 1500 W clamping performance in a single MSL Level 1–compatible SMC package - making it the only choice for Tier 1 automotive suppliers requiring full material and reliability documentation.
Availability
SM15T24AHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive I/O protection, and telecom power interface applications requiring stable component supply, long-term lifecycle support, and full AEC-Q101 traceability.
Supply support for SM15T24AHM3/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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SM15T Series was developed specifically for high-energy transient suppression in harsh-environment applications - targeting automotive, industrial, and telecom systems where failure modes must be controlled and clamping precision is critical to system-level safety.
FAQ
What is the clamping voltage of SM15T24AHM3/H at its rated peak pulse current?
The SM15T24AHM3/H clamps to a maximum of 33.2 V when subjected to its rated 45 A peak pulse current (10/1000 μs waveform). This value is measured under standardized test conditions per JEDEC and is guaranteed across the full operating temperature range of -65 °C to +150 °C. The clamping voltage directly determines the maximum stress imposed on protected components, making it a critical parameter for validating system-level surge immunity.
Is SM15T24AHM3/H suitable for bidirectional transient protection?
No, SM15T24AHM3/H is a unidirectional TVS diode, as indicated by the "A" suffix and cathode-band marking. For bidirectional protection, Vishay offers the CA-suffixed variant (e.g., SM15T24CAHM3/H), which provides symmetrical clamping in both polarities. Using SM15T24AHM3/H in bidirectional applications risks failure during positive-going transients due to forward conduction limitations.
Does SM15T24AHM3/H require a heatsink for standard operation?
No, SM15T24AHM3/H does not require an external heatsink under normal pulsed operation. Its thermal design relies on PCB copper pad area (0.31" × 0.31" per terminal) to dissipate transient energy. The 75 °C/W junction-to-ambient thermal resistance is specified under this mounting condition, and continuous power dissipation is limited to 6.5 W - well below typical surge duty cycles. Heatsinking is unnecessary unless operating continuously near PD limits.
What does the "HM3" suffix signify in SM15T24AHM3/H?
The "HM3" suffix in SM15T24AHM3/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" denotes AEC-Q101 compliance, "M3" specifies halogen-free materials per IEC 61249-2-21, and the trailing "/H" is the revision code. This suffix ensures full traceability to automotive reliability testing, including temperature cycling, HTRB, and ESD, while meeting global environmental regulations.
How does SM15T24AHM3/H compare to older SM15T24A variants in terms of reliability?
SM15T24AHM3/H improves upon legacy SM15T24A variants through AEC-Q101 qualification, halogen-free molding compound, and enhanced MSL Level 1 reflow compatibility (260 °C peak). These upgrades deliver superior long-term stability in automotive under-hood environments and eliminate whisker growth risk via JESD 201 Class 2 testing - features not guaranteed in non-HM3 versions like SM15T24A-E3/57T.
SM15T24AHM3/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:
- 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):
- 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)
SM15T24AHM3/H FAQ
1.How can I place an order for SM15T24AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24AHM3/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 SM15T24AHM3/H reliable?
The price and inventory of SM15T24AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T24AHM3/H is usually 5 days.
3.What payment methods are accepted for SM15T24AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24AHM3/H?
SM15T24AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24AHM3/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 SM15T24AHM3/H?
For technical support, including SM15T24AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24AHM3/H requirements.
6.How does Aetrix verify that SM15T24AHM3/H is sourced from the original manufacturer or authorized distributors?
All SM15T24AHM3/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 SM15T24AHM3/H meets industry standards.
7.What is the process for return or replacement of SM15T24AHM3/H?
All SM15T24AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24AHM3/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 SM15T24AHM3/H part is unused and in its original packaging.
Return procedure for SM15T24AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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