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Vishay General Semiconductor - Diodes Division SM6T22AHM3/H
- Part No.:
- SM6T22AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T22AHM3/H.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,448
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Product details
Overview
SM6T22AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, with 22 V breakdown voltage (VBR = 20.9–23.1 V at 1 mA), 30.6 V maximum clamping voltage (VC) at 20 A 10/1000 μs pulse, 600 W peak pulse power rating, and AEC-Q101 qualification for automotive use. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T22AHM3/H datasheet, SM6T22AHM3/H pinout, SM6T22AHM3/H application, or SM6T22AHM3/H equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, halogen-free RoHS-compliant construction, and thermal resistance (RθJA = 100 °C/W) on standard 5.0 mm × 5.0 mm copper pads.
Technical Context
The SM6T22AHM3/H employs a glass-passivated silicon junction to achieve low leakage (<1 μA at 18.8 V stand-off) and stable breakdown behavior. Its unidirectional configuration enables forward conduction only during reverse overvoltage events, with clamping initiated when transient voltage exceeds VBR by ~45%.
Designed for PCB-level ESD and surge protection, it delivers 600 W peak pulse power handling per JEDEC-standard 10/1000 μs waveform, with thermal derating above 25 °C per Fig. 2 and MSL Level 1 moisture sensitivity rating (peak reflow 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V at 1 mA - defines precise voltage threshold for avalanche conduction onset |
| VWM | 18.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 30.6 V at 20 A (10/1000 μs) - clamping voltage limiting protected circuit stress during surge |
| PPPM | 600 W - peak transient power dissipation capability without failure |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm copper pads |
| TJ max. | +150 °C - maximum allowable junction temperature for reliable long-term operation |
| AEC-Q101 | Qualified - validated for automotive-grade reliability per stress test requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band marking on unidirectional device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path terminal | Connected to system ground or low-side reference in unidirectional TVS configuration |
| Cathode | Avalanche conduction terminal | Marked end; connected to protected line-clamps to ground when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges in automotive ECUs without derating |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage stress on downstream ICs such as CAN transceivers or microcontrollers |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking or special handling |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive under-hood and body-control module applications requiring zero early-life failures |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting analog output lines of ABS wheel speed sensors exposed to load-dump and inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy before it reaches the sensor signal conditioner IC. Use Value: Limits voltage excursion to ≤30.6 V during 20 A surge, preserving signal integrity and preventing latch-up in downstream op-amps. | Use Scenario: Safeguarding PLC analog input channels connected to 24 V DC solenoid drivers subject to back-EMF spikes. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed at connector entry point to shunt surge current to chassis ground. Use Value: Clamps within nanoseconds to prevent damage to precision ADC front-end stages rated for ≤36 V absolute maximum. |
| Consumer Power Adapter Interfaces | Telecom Line Card Surge Protection |
Use Scenario: Input-stage protection for USB-C PD adapters where primary-side controller ICs require immunity to AC-line induced transients. IC Role / Device Role / Timing Role: Secondary-side TVS absorbing coupled surges from transformer leakage inductance and Y-capacitor paths. Use Value: Withstands 600 W pulses without degradation, maintaining <1 μA leakage at 18.8 V to avoid standby power loss. | Use Scenario: Ethernet PHY interface protection on PoE-powered network switches subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional clamp on data line pairs referenced to local ground plane, coordinated with common-mode chokes. Use Value: Low 20 °C/W junction-to-lead thermal resistance enables rapid heat dissipation during repetitive 10/1000 μs events per ITU-T K.21. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Same VBR range (20.9–23.1 V), but 400 W PPPM, non-AEC-Q101, SMA package (higher RθJA = 140 °C/W) | Limited to commercial-grade industrial or consumer use; not qualified for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and higher surge margin is unnecessary |
| 1.5SMC22A | Same VBR, 1500 W PPPM, DO-214AB (SMC) package, larger footprint, RθJA = 60 °C/W | Higher power handling supports longer-duration surges but requires 3× PCB area vs. SMB | Choose for high-energy environments like railway signaling where 600 W is insufficient |
Compared with SMAJ22A and 1.5SMC22A, the SM6T22AHM3/H uniquely balances AEC-Q101 compliance, compact SMB footprint, and 600 W capability-making it optimal for space-constrained automotive modules needing validated reliability without layout compromise.
Availability
SM6T22AHM3/H is available at Aetrix Electronics and suitable for automotive sensor units, industrial motor drive inputs, and telecom line card surge protection requiring stable component supply across production lifecycles.
Supply support for SM6T22AHM3/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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SM6T Series was developed specifically for surface-mount transient suppression in automotive, industrial, and telecom systems where compact size, high surge robustness, and qualification-grade consistency are mandatory.
FAQ
What is the clamping voltage of the SM6T22AHM3/H under a 10/1000 μs surge?
The SM6T22AHM3/H has a maximum clamping voltage (VC) of 30.6 V at 20 A for a 10/1000 μs waveform, as specified in the Vishay SM6T datasheet Rev. 09-Jan-2024. This value ensures downstream components see limited overvoltage stress during standardized surge events. The SM6T22AHM3/H maintains this clamping performance across its full operating temperature range when mounted per recommended pad layout.
Is the SM6T22AHM3/H suitable for automotive applications?
Yes, the SM6T22AHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in the Vishay SM6T datasheet. It meets automotive reliability requirements for under-hood and body-control modules. The SM6T22AHM3/H is explicitly designated for automotive use with halogen-free, RoHS-compliant construction and MSL Level 1 reflow compatibility.
What does the "HM3" suffix indicate in SM6T22AHM3/H?
The "HM3" suffix in SM6T22AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, HM3 indicates both environmental compliance and automotive-grade stress testing validation. The "/H" further specifies 7-inch tape-and-reel packaging with 750-unit quantity, consistent with Vishay's preferred package code H.
How does the SM6T22AHM3/H compare to bidirectional TVS diodes?
The SM6T22AHM3/H is unidirectional and features a cathode band marking; it conducts only during reverse overvoltage, unlike bidirectional types (e.g., SM6T22CA) that protect both polarities. Its VBR and VC apply solely to reverse bias. The SM6T22AHM3/H is selected when circuit topology uses grounded reference and only negative transients require suppression-reducing capacitance and leakage versus bidirectional alternatives.
What is the thermal resistance of the SM6T22AHM3/H, and how does it affect layout?
The SM6T22AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad area increases thermal resistance and may limit surge repetition rate. For the SM6T22AHM3/H, adhering to the specified pad dimensions ensures safe operation at full 600 W rating.
SM6T22AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, 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):
- 20A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SM6T22AHM3/H FAQ
1.How can I place an order for SM6T22AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T22AHM3/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 SM6T22AHM3/H reliable?
The price and inventory of SM6T22AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T22AHM3/H is usually 5 days.
3.What payment methods are accepted for SM6T22AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T22AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T22AHM3/H?
SM6T22AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T22AHM3/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 SM6T22AHM3/H?
For technical support, including SM6T22AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T22AHM3/H requirements.
6.How does Aetrix verify that SM6T22AHM3/H is sourced from the original manufacturer or authorized distributors?
All SM6T22AHM3/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 SM6T22AHM3/H meets industry standards.
7.What is the process for return or replacement of SM6T22AHM3/H?
All SM6T22AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T22AHM3/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 SM6T22AHM3/H part is unused and in its original packaging.
Return procedure for SM6T22AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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