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Vishay General Semiconductor - Diodes Division SM6T22AHM3_A/H
- Part No.:
- SM6T22AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T22AHM3_A/H.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,690
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Product details
Overview
SM6T22AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, featuring 22 V breakdown voltage (VBR = 20.9–23.1 V at 1 mA), 30.6 V maximum clamping voltage (VC) at 20 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T22AHM3_A/H datasheet, SM6T22AHM3_A/H pinout, SM6T22AHM3_A/H application, or SM6T22AHM3_A/H equivalent, key selection criteria include clamping performance under 20 A surge, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 100 °C/W) for PCB layout planning.
Technical Context
The SM6T22AHM3_A/H uses a glass-passivated silicon junction to achieve low inductance and fast response to transient events. Its unidirectional configuration provides reverse-biased clamping only, with cathode band indicating terminal polarity and no forward conduction beyond standard diode behavior.
Rated for 150 °C maximum junction temperature and compliant with J-STD-020 MSL Level 1 (260 °C peak reflow), it delivers stable clamping across -65 °C to +150 °C operating range. The device sustains 100 A non-repetitive forward surge current (10 ms half-sine) and exhibits 1.0 μA max reverse leakage at 18.8 V stand-off voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V at 1.0 mA - defines precise voltage threshold where clamping initiates under controlled test conditions |
| VWM | 18.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 30.6 V at 20 A (10/1000 μs) - actual clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - peak transient energy absorption capability without failure under standardized waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient air on standard 0.2" × 0.2" copper pads |
| TJ max | +150 °C - maximum allowable junction temperature for reliable long-term operation |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by molded band on case body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased clamping node | Connected to protected line; conducts during overvoltage to shunt current to ground |
| Anode | Reference/return path | Typically tied to system ground or lower-potential rail; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection of 12 V and 24 V automotive power rails against ISO 7637-2 Pulse 1/2a/5a transients |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics per stress test requirements including HTGB, TCT, and UHAST |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (< 1 ns rise time), critical for protecting high-speed interfaces |
| 100 °C/W RθJA on standard pads | Allows thermal design using common 5 mm × 5 mm copper areas without heatsinking for intermittent surge duty |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive kickback in engine control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp negative-going transients and positive surges above VWM. Use Value: Limits voltage excursion to ≤30.6 V during 20 A surge, preventing damage to 3.3 V/5 V interface ICs while maintaining signal integrity. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point, absorbing repetitive 600 W pulses without degradation. Use Value: Withstands ≥1000 surges at rated PPPM due to low thermal resistance and stable clamping, extending field service life. |
| Consumer Power Adapter Input | Telecom DC Power Feed Protection |
Use Scenario: Secondary-side transient suppression on 12 V/19 V DC outputs of wall adapters subjected to accidental short-circuit recovery spikes and ESD coupling. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp parallel to output capacitor, activated within nanoseconds of overvoltage onset. Use Value: 1.0 μA leakage at 18.8 V ensures minimal standby power loss while delivering sub-31 V clamping under 20 A stress. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras, wireless APs) from induced surges on 48 V DC feed lines running alongside AC mains in building infrastructure. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail, coordinated with upstream fusing to clear faults before thermal runaway. Use Value: AEC-Q101 qualification ensures reliability under extended temperature cycling (−40 °C to +85 °C ambient), matching telecom environmental specs. |
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-E3/5B | Same VBR range (20.9–23.1 V), but SMA package (higher RθJA = 140 °C/W); not AEC-Q101 qualified | Limited to commercial-grade industrial or consumer use; unsuitable for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and thermal margin is sufficient |
| SMCJ22A-HM3_A/H | Higher PPPM (1500 W), same SMB package and AEC-Q101 qualification; VC = 35.5 V @ 42.8 A | Better suited for systems requiring higher surge immunity (e.g., alternator load dump), but larger voltage overshoot during clamping | Choose when legacy board space allows and 35.5 V clamping is acceptable for downstream 3.3 V logic |
Compared with SMAJ22A-E3/5B and SMCJ22A-HM3_A/H, the SM6T22AHM3_A/H offers optimal balance of AEC-Q101 compliance, 600 W surge handling, and 30.6 V clamping in compact SMB footprint-ideal for space-constrained automotive sensor nodes where both reliability and voltage headroom matter.
Availability
SM6T22AHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, and telecom DC power feeds requiring stable component supply with full traceability and lifecycle support.
Supply support for SM6T22AHM3_A/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, industry-qualified components for demanding environments.
The SM6T Series was developed specifically for surface-mount transient suppression in automotive, industrial, and telecom applications where AEC-Q101 compliance, low clamping voltage, and consistent surge performance are mandatory.
FAQ
What does the "HM3" suffix indicate in SM6T22AHM3_A/H?
The "HM3" suffix in SM6T22AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms the device meets automotive reliability standards including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing-verified per Vishay's qualification report for the SM6T family.
Is SM6T22AHM3_A/H bidirectional or unidirectional?
SM6T22AHM3_A/H is unidirectional. Its cathode is marked by a visible band on the SMB package body, and it clamps only in reverse bias. Bidirectional variants use the "CA" suffix (e.g., SM6T22CA); this part is not interchangeable with them without circuit redesign.
What is the maximum clamping voltage of SM6T22AHM3_A/H under surge conditions?
The maximum clamping voltage of SM6T22AHM3_A/H is 30.6 V when subjected to a 20 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC standard and appears in the Electrical Characteristics table of the official Vishay datasheet (Doc. #88385).
Can SM6T22AHM3_A/H replace SM6T22A-E3/52 in an existing design?
Yes-SM6T22AHM3_A/H is a direct replacement for SM6T22A-E3/52 in terms of electrical specs and SMB footprint, but adds AEC-Q101 qualification and halogen-free materials. No PCB changes are needed; however, requalification per automotive standards is recommended if migrating to automotive applications.
What is the thermal resistance (RθJA) of SM6T22AHM3_A/H, and how is it measured?
The typical junction-to-ambient thermal resistance (RθJA) of SM6T22AHM3_A/H is 100 °C/W, measured with the device mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per JEDEC JESD51-2. This value assumes still air and standard PCB layout-actual performance depends on board copper area and airflow.
SM6T22AHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SM6T22AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T22AHM3_A/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_A/H reliable?
The price and inventory of SM6T22AHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SM6T22AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T22AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T22AHM3_A/H?
SM6T22AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T22AHM3_A/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_A/H?
For technical support, including SM6T22AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T22AHM3_A/H requirements.
6.How does Aetrix verify that SM6T22AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T22AHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SM6T22AHM3_A/H?
All SM6T22AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T22AHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SM6T22AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T22AHM3_A/H Tags
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Diodes Incorporated
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Diodes Incorporated
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