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Vishay General Semiconductor - Diodes Division SM6T22CAHM3/I
- Part No.:
- SM6T22CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T22CAHM3/I.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
SM6T22CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 600 W peak pulse power (10/1000 μs), 22 V breakdown voltage (VBR = 20.9–23.1 V at IT = 1.0 mA), and 30.6 V maximum clamping voltage (VC) at IPPM. It protects signal lines in automotive sensor units against ESD and inductive switching transients.
For engineers reviewing the SM6T22CAHM3/I datasheet, SM6T22CAHM3/I pinout, SM6T22CAHM3/I application, or SM6T22CAHM3/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, SMB package thermal data, and real-world protection use cases - all confirmed from Vishay's official SM6T Series document #88385 (Rev. 09-Jan-2024).
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with no cathode/anode marking, enabling robust surge suppression on AC-coupled or differential signal paths. Its glass-passivated junction ensures stable VBR and low leakage (<1.0 μA at VWM = 18.8 V), while MSL Level 1 rating supports lead-free reflow up to 260 °C.
Designed for high-reliability environments, SM6T22CAHM3/I features halogen-free, RoHS-compliant construction (HM3 suffix) and AEC-Q101 qualification - confirmed by Vishay's ordering code structure and mechanical data sheet. Thermal resistance is RθJA = 100 °C/W (typ.) on 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V at IT = 1.0 mA - defines precise clamping onset threshold for bidirectional overvoltage events |
| VWM | 18.8 V - maximum continuous reverse stand-off voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 30.6 V at 20.0 A (10/1000 μs) - actual clamped voltage during worst-case surge, limiting downstream IC stress |
| PPPM | 600 W - peak pulse power handling capability per standard 10/1000 μs waveform |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, guiding PCB pad layout for thermal reliability |
Pinout & Package
SM6T22CAHM3/I uses the SMB (DO-214AA) surface-mount package: 4.57 mm × 3.94 mm × 2.20 mm body, matte tin-plated leads, UL 94 V-0 molding compound. Bidirectional configuration means no polarity marking; both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | No polarity - either terminal accepts positive or negative transients; enables placement on AC or differential lines without orientation check |
| Case (body) | Thermal interface | Non-electrical; requires minimum 5.0 mm × 5.0 mm copper pad per terminal for specified RθJA and PPPM derating |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surges in automotive ECUs |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20D requirements for green manufacturing |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage margin between clamping and protected IC's absolute maximum rating |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping transient energy before it reaches the transceiver's ESD protection diodes. Use Value: Prevents latch-up or permanent damage to NXP TJA1042 or ST TPD1042 when VC = 30.6 V stays below transceiver's 36 V abs max rating. | Use Scenario: Shielding RS-485/RS-422 differential pairs in factory automation PLC I/O modules from EFT and surge coupling. IC Role / Device Role / Timing Role: Symmetric clamping on both A and B lines to maintain common-mode noise rejection during fast transients. Use Value: Maintains signal integrity with <1 ns response time and <0.5 pF junction capacitance (per Vishay Fig. 4), avoiding data corruption at 10 Mbps. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
Use Scenario: Safeguarding USB 2.0 D+/D− lines in smart home hubs against human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed directly at connector to shunt >8 kV contact discharge. Use Value: Achieves IEC 61000-4-2 Level 4 compliance with VC ≤ 30.6 V limiting stress on USB PHY's 3.6 V I/O rails. | Use Scenario: Front-end protection of ADSL/VDSL line drivers in residential gateways subjected to lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Primary surge diverter upstream of GDT and secondary TVS, absorbing bulk energy before secondary clamping stage. Use Value: Handles 600 W peak pulse without degradation, extending system MTBF beyond 10 years per Telcordia GR-1089-CORE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA | 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W), same VBR range | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) | Select SMAJ22CA only for space-constrained consumer designs where 400 W suffices and thermal margin allows. |
| 1.5KE22CA | 1500 W PPPM, DO-204AC (axial leaded) package, higher VC = 33.2 V | Not SMT-compatible; requires through-hole assembly and board real estate; better for legacy industrial power supplies | Choose 1.5KE22CA when higher surge margin is critical and automated SMT is not required. |
Compared with SMAJ22CA and 1.5KE22CA, SM6T22CAHM3/I uniquely balances 600 W surge capacity, AEC-Q101 qualification, SMB SMT compatibility, and halogen-free compliance - making it the optimal choice for new automotive and industrial designs requiring production-ready reliability and RoHS adherence.
Availability
SM6T22CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor units, industrial CAN bus interfaces, and telecom DSL line protection requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SM6T22CAHM3/I 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 SM6T Series is designed specifically for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping performance, AEC-Q101 validation, and halogen-free compliance in compact SMB packages.
FAQ
What is the breakdown voltage tolerance for SM6T22CAHM3/I?
The SM6T22CAHM3/I has a guaranteed breakdown voltage range of 20.9 V to 23.1 V at test current IT = 1.0 mA, per Vishay's SM6T Series datasheet #88385 (Table on page 2). This ±5% tolerance ensures predictable clamping onset across production lots and temperature extremes from –65 °C to +150 °C.
Is SM6T22CAHM3/I suitable for automotive applications?
Yes - SM6T22CAHM3/I carries the HM3 suffix, confirming halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. Vishay explicitly lists "AEC-Q101 qualified available" for HM3 variants in the Mechanical Data section, validating its use in engine control, ADAS sensors, and infotainment systems per automotive reliability standards.
What is the maximum clamping voltage of SM6T22CAHM3/I under surge conditions?
The SM6T22CAHM3/I clamps to a maximum of 30.6 V at IPPM = 20.0 A using the industry-standard 10/1000 μs double-exponential waveform. This value is measured and guaranteed per datasheet Table (page 2), ensuring downstream ICs with 3.3 V or 5 V I/O rails remain within safe operating limits during transient events.
Does SM6T22CAHM3/I have polarity markings on the package?
No - SM6T22CAHM3/I is a bidirectional TVS diode (indicated by the "CA" suffix), so it has no cathode band or polarity marking. Both terminals are functionally identical, allowing unrestricted placement on AC-coupled, differential, or floating signal lines without orientation verification during SMT assembly.
What is the thermal resistance of SM6T22CAHM3/I, and how does it affect layout?
SM6T22CAHM3/I 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. To achieve this rating, PCB layout must provide minimum pad dimensions per Vishay's recommended mounting footprint - undersized pads increase RθJA and risk thermal runaway during repeated surges.
SM6T22CAHM3/I 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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T22CAHM3/I FAQ
1.How can I place an order for SM6T22CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T22CAHM3/I 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 SM6T22CAHM3/I reliable?
The price and inventory of SM6T22CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T22CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM6T22CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T22CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T22CAHM3/I?
SM6T22CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T22CAHM3/I 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 SM6T22CAHM3/I?
For technical support, including SM6T22CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T22CAHM3/I requirements.
6.How does Aetrix verify that SM6T22CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T22CAHM3/I 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 SM6T22CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM6T22CAHM3/I?
All SM6T22CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T22CAHM3/I, 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 SM6T22CAHM3/I part is unused and in its original packaging.
Return procedure for SM6T22CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T22CAHM3/I Tags
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