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Vishay General Semiconductor - Diodes Division SM15T22AHM3/H
- Part No.:
- SM15T22AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T22AHM3/H.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,572
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Product details
Overview
SM15T22AHM3/H from Vishay General Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) in SMC (DO-214AB) package, with 22 V breakdown voltage (VBR = 20.9–23.1 V), 30.6 V clamping voltage (VC) at 49 A peak pulse current, and 18.8 V stand-off voltage (VWM). It protects MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive and industrial power electronics.
For engineers reviewing the SM15T22AHM3/H datasheet, SM15T22AHM3/H pinout, SM15T22AHM3/H application, or SM15T22AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS compliance, 150 °C max junction temperature, low-inductance SMC package, and verified clamping performance under 10/1000 μs waveform stress.
Technical Context
The SM15T22AHM3/H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 20.9–23.1 V breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 μA at 18.8 V), while thermal resistance (RθJA = 75 °C/W) supports operation up to 150 °C junction temperature.
Designed for high-energy transient suppression, it delivers 1500 W peak pulse power (10/1000 μs), clamps at 30.6 V under 49 A IPPM, and exhibits low dynamic impedance-enabling fast response to sub-microsecond surges without oscillation or latch-up in DC power rails and I/O lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V - defines precise avalanche initiation range for reliable overvoltage triggering |
| VWM | 18.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 30.6 V @ 49 A - clamping voltage during 10/1000 μs surge, limiting protected circuit stress |
| PPPM | 1500 W - peak transient power handling capability under standardized surge waveform |
| TJ max | 150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| Package | SMC (DO-214AB) - surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height for automated assembly |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
SM15T22AHM3/H uses the standard SMC (DO-214AB) package: molded plastic body with matte tin-plated leads, polarity indicated by cathode band on one end. Mounting requires 8.0 mm × 8.0 mm copper pads per terminal per JEDEC recommendations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes low-inductance current loop during clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against lightning surges and motor-switching transients without derating in typical PCB layouts |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, with <1 μA leakage at VWM for low standby power loss |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, ADAS sensors, and body electronics |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-208 material requirements for green manufacturing |
| Low inductance SMC package | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or inductive kickback) due to compact leadframe geometry |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in engine control modules against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and downstream DC/DC converter input. Use Value: Clamps 30.6 V at 49 A, preventing damage to 36 V-rated regulators while maintaining AEC-Q101 compliance. | Use Scenario: Safeguarding analog sensor inputs (e.g., current shunt amplifiers) in variable-frequency drives. IC Role / Device Role / Timing Role: Transient suppressor on 0–5 V feedback lines exposed to switching noise from IGBT gate drivers. Use Value: Limits induced spikes to ≤30.6 V within 1 ns response time, preserving ADC accuracy and avoiding false fault triggers. |
| Telecom Line Interface Protection | Consumer Appliance Control Board Protection |
Use Scenario: Shielding RS-485 transceiver pins in base station backhaul equipment from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used on DC bias lines feeding isolated data interfaces. Use Value: Withstands 1500 W surges while adding <0.5 pF capacitance, preserving signal integrity up to 10 Mbps. | Use Scenario: Guarding microcontroller GPIOs and relay driver outputs in smart HVAC controllers subjected to relay coil flyback. IC Role / Device Role / Timing Role: Clamp device mounted directly at connector entry point to divert inductive energy before reaching logic-level components. Use Value: 200 A IFSM rating handles repetitive 10 ms half-sine surges from 24 V solenoid coils without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/57T | 600 W PPPM, SMA package (smaller footprint), VC = 35.5 V @ 17 A | Limited to lower-energy threats; unsuitable for automotive load-dump per ISO 7637-2 Pulse 5a | Select when space-constrained and surge threat level is ≤600 W (e.g., consumer USB ports) |
| 1.5KE22A | Through-hole DO-201 package, same VBR/VC, but 1500 W rating requires larger board area and manual assembly | Not AEC-Q101 qualified; lacks halogen-free certification and MSL-1 reflow compatibility | Choose only for legacy through-hole designs where SMT is not feasible |
Compared with SMAJ22A-E3/57T and 1.5KE22A, SM15T22AHM3/H uniquely combines AEC-Q101 qualification, halogen-free compliance, SMC's superior thermal dissipation (RθJL = 15 °C/W), and verified 1500 W surge margin for automotive and industrial deployment.
Availability
SM15T22AHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, telecom interface modules, and consumer appliance control boards requiring stable component supply across long production lifecycles.
Supply support for SM15T22AHM3/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 SM15T Series was engineered for high-power transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where failure modes must be controlled (short-circuit safe) and performance must remain stable over temperature and lifetime.
FAQ
What is the clamping voltage of SM15T22AHM3/H at its rated peak pulse current?
The SM15T22AHM3/H has a maximum clamping voltage (VC) of 30.6 V when subjected to its specified peak pulse current (IPPM) of 49 A under the 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and ensures downstream components see limited overvoltage stress during surge events. The SM15T22AHM3/H maintains this clamping performance across its full operating temperature range.
Is SM15T22AHM3/H suitable for automotive applications?
Yes, SM15T22AHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets stringent requirements for temperature cycling, high-temperature reverse bias, and mechanical shock-making it appropriate for engine control units, body control modules, and ADAS sensor interfaces where reliability under vibration and thermal stress is critical. The SM15T22AHM3/H is explicitly listed in Vishay's automotive-qualified product matrix.
What does the "HM3" suffix mean in SM15T22AHM3/H?
The "HM3" suffix in SM15T22AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade "E3" or "M3" versions and confirms compliance with JEDEC J-STD-208 material standards and JESD22 whisker testing Class 2. The "H" indicates automotive qualification, while "M3" specifies halogen-free molding compound-critical for emissions-sensitive automotive and industrial applications. SM15T22AHM3/H is not interchangeable with non-HM3 variants without requalification.
How does SM15T22AHM3/H differ from bidirectional TVS diodes like SM15T22CA?
SM15T22AHM3/H is unidirectional and features a cathode band for polarity identification, whereas SM15T22CA is bidirectional with no polarity marking and symmetric breakdown in both directions. The SM15T22AHM3/H is intended for DC circuits where reverse voltage is blocked (e.g., power rail protection), while SM15T22CA suits AC-coupled or floating signal lines. Their VBR, VC, and PPPM ratings are identical, but SM15T22AHM3/H offers lower leakage in forward-biased configurations.
What is the thermal resistance of SM15T22AHM3/H, and how does it affect layout design?
SM15T22AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. To maintain safe operation below 150 °C junction temperature, PCB layout must use minimum 8.0 mm × 8.0 mm copper pads per terminal as specified in Vishay document 88380. Reducing pad size or omitting thermal vias increases RθJA, risking thermal runaway during repeated surge events. The SM15T22AHM3/H datasheet provides derating curves for elevated ambient temperatures.
SM15T22AHM3/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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 49A
- 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)
SM15T22AHM3/H FAQ
1.How can I place an order for SM15T22AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T22AHM3/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 SM15T22AHM3/H reliable?
The price and inventory of SM15T22AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T22AHM3/H is usually 5 days.
3.What payment methods are accepted for SM15T22AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T22AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T22AHM3/H?
SM15T22AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T22AHM3/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 SM15T22AHM3/H?
For technical support, including SM15T22AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T22AHM3/H requirements.
6.How does Aetrix verify that SM15T22AHM3/H is sourced from the original manufacturer or authorized distributors?
All SM15T22AHM3/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 SM15T22AHM3/H meets industry standards.
7.What is the process for return or replacement of SM15T22AHM3/H?
All SM15T22AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T22AHM3/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 SM15T22AHM3/H part is unused and in its original packaging.
Return procedure for SM15T22AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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