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Vishay General Semiconductor - Diodes Division SM6T22A-M3/5B
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- Part No.:
- SM6T22A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T22A-M3/5B.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,209
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Product details
Overview
SM6T22A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode 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, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SM6T22A-M3/5B datasheet, SM6T22A-M3/5B pinout, SM6T22A-M3/5B application, or SM6T22A-M3/5B equivalent, key selection criteria include unidirectional polarity, 18.8 V stand-off voltage (VWM), 1.0 μA max reverse leakage at VWM, 100 °C/W junction-to-ambient thermal resistance, and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
The SM6T22A-M3/5B uses a glass-passivated silicon junction to achieve low clamping ratio (VC/VBR ≈ 1.32) and low dynamic impedance under transient stress. Its SMB package enables automated placement and meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Designed for single-polarity surge suppression, it conducts only during reverse overvoltage events - forward conduction is limited to 100 A non-repetitive surge (IFSM) - and exhibits no bidirectional behavior unless explicitly marked with "CA" suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V at 1.0 mA test current - defines precise voltage threshold for avalanche conduction onset |
| VWM | 18.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 30.6 V at 20.0 A (10/1000 μs) - clamping voltage limiting downstream circuit stress during surge |
| PPPM | 600 W - peak transient power handling capability under standardized surge waveform |
| ID @ VWM | ≤1.0 μA - ensures negligible standby power loss and signal integrity in high-impedance circuits |
| RθJA | 100 °C/W - thermal resistance determining junction temperature rise under DC power dissipation |
| TJ max | +150 °C - maximum allowable junction temperature supporting operation in under-hood automotive environments |
Pinout & Package
SMB (DO-214AA) surface-mount package with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability and JESD 22-B102 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems |
| Low clamping voltage (30.6 V @ 20 A) | Keeps protected MOSFET gate-source or IC supply rail below destructive thresholds during surge |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive OEM production |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns |
| Glass passivated junction | Ensures stable VBR and low leakage across temperature and long-term operation |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V power rails feeding ECUs, body control modules, and lighting drivers from load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and ground to shunt transients before reaching downstream regulators and microcontrollers. Use Value: Limits voltage excursion to ≤30.6 V during 20 A surges, preventing latch-up or oxide breakdown in 36 V-rated power management ICs. |
Use Scenario: Safeguarding analog output lines of pressure, temperature, or position sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Point-of-entry TVS on sensor signal traces to suppress ESD and field-induced noise coupling. Use Value: 1.0 μA leakage at 18.8 V ensures minimal offset error in 24 V loop-powered 4–20 mA transmitter circuits. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Input-side transient suppression in AC/DC adapters for smart home hubs and set-top boxes subjected to mains-borne surges. IC Role / Device Role / Timing Role: Primary-side TVS across bridge rectifier output to clamp fast-rising line transients before bulk capacitor charging stage. Use Value: 600 W rating handles combination wave surges (1.2/50 μs + 8/20 μs) per IEC 61000-4-5 Level 3 without degradation. |
Use Scenario: Secondary-side protection on Ethernet PHY power rails and data line terminations in PoE-powered network switches. IC Role / Device Role / Timing Role: Localized clamping device on isolated 3.3 V or 5 V bias rails feeding magnetics and PHY ICs. Use Value: SMB footprint allows dense placement near connectors while maintaining <100 ps response time to ESD events. |
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 | Same VBR range (20.9–23.1 V), but lower PPPM = 400 W and higher VC = 35.5 V @ 17.1 A; SMA package (larger footprint) | Less robust for automotive load dump; suitable for cost-sensitive consumer-grade designs with lower surge severity | Select SMAJ22A only if 400 W rating suffices and board space permits larger SMA outline. |
| 1.5SMC22A | Higher PPPM = 1500 W, same VBR, but SMC package (DO-214AB); 2× footprint area vs. SMB | Better for high-energy transients (e.g., ISO 16750-2), but incompatible with SMB-constrained layouts | Choose 1.5SMC22A when energy handling exceeds 600 W and PCB real estate allows SMC mounting. |
Compared with SMAJ22A and 1.5SMC22A, the SM6T22A-M3/5B delivers optimal balance of 600 W surge capacity, compact SMB footprint, and halogen-free compliance - making it preferred for space-constrained automotive and industrial modules where both reliability and manufacturability matter.
Availability
SM6T22A-M3/5B is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, consumer power adapter input stages, and telecom line card surge protection requiring stable component supply and full traceability.
Supply support for SM6T22A-M3/5B 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, thermal performance, and automotive qualification.
The SM6T Series is designed specifically for surface-mount transient voltage suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, high surge capability, and AEC-Q101 readiness are critical.
FAQ
What is the polarity configuration of the SM6T22A-M3/5B?
The SM6T22A-M3/5B is a unidirectional TVS diode, meaning it conducts only during reverse-biased overvoltage events. The cathode is identified by a band on the SMB package body, and forward conduction is limited to non-repetitive 100 A surge. It does not provide bidirectional protection unless explicitly ordered with "CA" suffix (e.g., SM6T22CA).
Does the SM6T22A-M3/5B meet automotive qualification standards?
The base SM6T22A-M3/5B is commercial-grade and halogen-free RoHS-compliant, but not AEC-Q101 qualified. For automotive use, Vishay offers variants with HE3 or HM3 suffixes (e.g., SM6T22AHM3_B/I), which carry AEC-Q101 qualification and extended temperature validation. The SM6T22A-M3/5B itself is rated for TJ = –65 °C to +150 °C but lacks formal automotive qualification documentation.
What is the maximum clamping voltage of the SM6T22A-M3/5B under standard test conditions?
The SM6T22A-M3/5B has a maximum clamping voltage (VC) of 30.6 V when subjected to a 10/1000 μs waveform at IPPM = 20.0 A. This value is measured per Figure 1 in Vishay document 88385 and reflects worst-case voltage seen by protected circuitry during a defined surge event.
How does the M3 suffix affect the SM6T22A-M3/5B's material composition and compliance?
The M3 suffix on SM6T22A-M3/5B indicates halogen-free, RoHS-compliant construction per JEDEC standards, with matte tin-plated leads meeting J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2. It differs from E3-suffix parts only in halogen content - both are commercial-grade and share identical electrical and thermal specifications.
Can the SM6T22A-M3/5B be used in bidirectional signal line protection?
No - the SM6T22A-M3/5B is strictly unidirectional and unsuitable for bidirectional signal lines such as RS-485 or USB D+/D– without external circuitry. For bidirectional protection, Vishay specifies CA-suffix variants (e.g., SM6T22CA), which feature symmetrical breakdown in both directions and no polarity marking.
SM6T22A-M3/5B 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:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T22A-M3/5B FAQ
1.How can I place an order for SM6T22A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T22A-M3/5B 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 SM6T22A-M3/5B reliable?
The price and inventory of SM6T22A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T22A-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T22A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T22A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T22A-M3/5B?
SM6T22A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T22A-M3/5B 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 SM6T22A-M3/5B?
For technical support, including SM6T22A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T22A-M3/5B requirements.
6.How does Aetrix verify that SM6T22A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T22A-M3/5B 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 SM6T22A-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T22A-M3/5B?
All SM6T22A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T22A-M3/5B, 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 SM6T22A-M3/5B part is unused and in its original packaging.
Return procedure for SM6T22A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T22A-M3/5B Tags
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