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Vishay General Semiconductor - Diodes Division SM6T22A-M3/52
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- Part No.:
- SM6T22A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T22A-M3/52.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,948
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Product details
Overview
SM6T22A-M3/52 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 1.0 mA), 30.6 V maximum clamping voltage (VC) at 20 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SM6T22A-M3/52 datasheet, SM6T22A-M3/52 pinout, SM6T22A-M3/52 application, or SM6T22A-M3/52 equivalent, key selection criteria include clamping performance under 20 A surge, unidirectional polarity with cathode band marking, halogen-free RoHS compliance (M3 suffix), and SMB package thermal resistance (RθJA = 100 °C/W).
Technical Context
The SM6T22A-M3/52 uses a glass-passivated silicon junction to achieve low dynamic impedance and fast response (<1 ns) to ESD and surge events. Its unidirectional configuration provides forward conduction capability up to 100 A IFSM (10 ms half-sine), enabling robust protection of DC power rails and low-voltage logic interfaces.
Designed for PCB-level transient suppression, it operates across -65 °C to +150 °C junction temperature range and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. The device exhibits 1.0 μA max reverse leakage at 18.8 V stand-off voltage and 9.2 × 10−4/°C temperature coefficient of VBR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V at 1.0 mA - defines precise breakdown threshold for reliable overvoltage triggering |
| VWM | 18.8 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 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 handling capacity without failure under standardized surge waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C ambient |
| TJ max | +150 °C - maximum allowable junction temperature supporting operation in under-hood automotive environments |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 0.220" x 0.130" footprint and 0.086" height |
Pinout & Package
SMB (DO-214AA) package with molded plastic body, matte tin-plated leads, and cathode band marking on the case. Leads are solderable per J-STD-002 and JESD 22-B102; meets JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected circuit ground or low-side return path; enables conduction during reverse transient |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 24 V rail or signal); clamps voltage when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection of 24 V industrial buses against IEC 61000-4-5 Level 3 surges (1 kV/42 Ω) |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage stress on downstream 3.3 V or 5 V logic while maintaining margin above VWM |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance requirements without compromising thermal or electrical performance |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking or special handling |
| AEC-Q101 qualification option available | Base P/NHM3_X variant supports automotive-grade reliability validation; SM6T22A-M3/52 is commercial grade |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 24 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp overvoltage before reaching LDOs or microcontrollers. Use Value: With VC = 30.6 V at 20 A, SM6T22A-M3/52 limits rail excursion below 33 V, preserving 28 V absolute maximum ratings of common automotive PMICs. |
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SM6T22A-M3/52 used in unidirectional configuration across signal-to-ground to suppress negative transients only. Use Value: 1.0 μA leakage at 18.8 V ensures minimal impact on loop accuracy, while 30.6 V clamping prevents op-amp input stage damage during ±8 kV contact ESD. |
| DC Motor Driver Gate Protection | Telecom Power Interface Protection |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers from inductive kickback during PWM commutation in BLDC motor controllers. IC Role / Device Role / Timing Role: TVS connected between gate and source terminals to clamp Miller-induced voltage spikes exceeding VGS(max). Use Value: Fast <1 ns response and 30.6 V clamping ensure gate oxide integrity for MOSFETs rated ≤ 30 V VGS, preventing unintended turn-on or avalanche failure. |
Use Scenario: Front-end surge suppression on 48 V PoE-powered equipment (e.g., IP cameras) exposed to lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary unidirectional TVS on DC input rail, coordinated with secondary GDT or MOV stages for staged energy absorption. Use Value: 600 W PPPM rating allows SM6T22A-M3/52 to absorb initial 10/1000 μs surge energy before upstream components activate, reducing system-level BOM count. |
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-E3/52 | Same SMB package, identical VBR (20.9–23.1 V), but lower PPPM = 400 W and higher VC = 35.5 V at 17.1 A | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 3 or automotive load dump | Select SMAJ22A-E3/52 only if cost sensitivity outweighs 33% lower surge margin and higher clamping voltage. |
| 1.5SMC22A | Same electrical specs but in larger SMC (DO-214AB) package; RθJA = 60 °C/W vs. 100 °C/W; 1.5 kW PPPM rating | Requires more PCB area but delivers superior thermal performance and surge headroom in high-reliability designs | Choose 1.5SMC22A when board space permits and junction temperature rise must stay below 40 °C under repeated 20 A pulses. |
Compared with SMAJ22A-E3/52 and 1.5SMC22A, SM6T22A-M3/52 offers optimal balance of compact SMB footprint, 600 W surge capability, and halogen-free compliance-making it preferred for space-constrained automotive and industrial modules where mid-tier surge immunity suffices.
Availability
SM6T22A-M3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supply front-ends requiring stable component supply with halogen-free compliance and MSL Level 1 reflow support.
Supply support for SM6T22A-M3/52 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 engineered for surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and process compatibility are critical.
FAQ
What is the exact breakdown voltage range for SM6T22A-M3/52?
The SM6T22A-M3/52 has a guaranteed breakdown voltage range of 20.9 V to 23.1 V at 1.0 mA test current, as specified in the Vishay datasheet revision 09-Jan-2024. This tolerance ensures consistent triggering behavior across production lots and temperature ranges, making SM6T22A-M3/52 suitable for precision rail protection where overvoltage margin must be tightly controlled.
Is SM6T22A-M3/52 suitable for bidirectional transient suppression?
No, SM6T22A-M3/52 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the CA-suffixed variant (e.g., SM6T22CA). Using SM6T22A-M3/52 in AC or dual-polarity circuits would result in forward conduction during negative half-cycles, potentially damaging the device or unprotected circuitry.
What does the "M3/52" suffix mean in SM6T22A-M3/52?
The "M3" suffix denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance; "/52" indicates packaging in 7" diameter plastic tape and reel with 750 units per reel. This configuration ensures compatibility with high-speed pick-and-place equipment and satisfies environmental compliance requirements for commercial and industrial end products using SM6T22A-M3/52.
How does SM6T22A-M3/52 perform under elevated ambient temperatures?
SM6T22A-M3/52 derates linearly above 25 °C ambient: its peak pulse power drops to ~400 W at 75 °C and ~200 W at 125 °C, per Figure 2 in the datasheet. Engineers must apply this derating when designing for under-hood automotive or enclosed industrial enclosures, ensuring SM6T22A-M3/52 remains within safe operating area during worst-case surge events.
Can SM6T22A-M3/52 replace older SMAJ22A in existing designs?
SM6T22A-M3/52 is not a direct drop-in replacement for SMAJ22A due to higher PPPM (600 W vs. 400 W) and lower VC (30.6 V vs. 35.5 V), which may alter system-level clamping behavior and stress distribution. While both use SMB packages, layout validation is required to confirm thermal and electrical compatibility before substituting SM6T22A-M3/52 into an SMAJ22A-based design.
SM6T22A-M3/52 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-M3/52 FAQ
1.How can I place an order for SM6T22A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T22A-M3/52 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-M3/52 reliable?
The price and inventory of SM6T22A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T22A-M3/52 is usually 5 days.
3.What payment methods are accepted for SM6T22A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T22A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T22A-M3/52?
SM6T22A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T22A-M3/52 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-M3/52?
For technical support, including SM6T22A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T22A-M3/52 requirements.
6.How does Aetrix verify that SM6T22A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T22A-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of SM6T22A-M3/52?
All SM6T22A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T22A-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for SM6T22A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T22A-M3/52 Tags
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