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Vishay General Semiconductor - Diodes Division SMCJ22A-M3/9AT
- Part No.:
- SMCJ22A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ22A-M3/9AT.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,623
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Product details
Overview
SMCJ22A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 35.5 V maximum clamping voltage at 42.3 A peak pulse current and 22 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMCJ22A-M3/9AT datasheet, SMCJ22A-M3/9AT pinout, SMCJ22A-M3/9AT application, or SMCJ22A-M3/9AT equivalent, key selection criteria include unidirectional polarity, 24.4–26.9 V breakdown voltage range at 1 mA test current, 1.0 μA max reverse leakage at 22 V, 75 °C/W junction-to-ambient thermal resistance, and halogen-free RoHS-compliant M3 termination.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) to transient overvoltages and low incremental surge resistance. Its unidirectional configuration provides cathode-banded polarity for DC rail protection, with clamping action triggered when reverse voltage exceeds 24.4 V.
The device operates across -55 °C to +150 °C junction temperature range and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It delivers 1500 W peak pulse power handling under 10/1000 μs waveform while maintaining stable clamping performance on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 22 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 24.4–26.9 V at 1 mA - Confirmed voltage range where device enters avalanche conduction |
| Clamping Voltage (VC) | 35.5 V at 42.3 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge |
| Peak Pulse Power (PPPM) | 1500 W - Surge energy absorption capability under standardized 10/1000 μs waveform |
| Reverse Leakage (ID) | 1.0 μA max at 22 V - Minimal parasitic current draw in standby, preserving system efficiency |
| Junction Temperature Range | -55 °C to +150 °C - Validated operation in under-hood automotive and industrial ambient conditions |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SMCJ22A-M3/9AT uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage event |
| Anode (non-banded end) | Reference node | Typically tied to system ground or low-impedance return path for clamping loop integrity |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables automated placement and high-density PCB layouts without height interference |
| Glass-passivated junction | Ensures stable avalanche characteristics and long-term reliability under repeated surge stress |
| 1500 W peak pulse rating | Provides robust protection against IEC 61000-4-5 Level 4 (4 kV) surges on 12 V/24 V systems |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance requirements for automotive and industrial OEM production |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients before they reach downstream regulators and microcontrollers. Use Value: Limits voltage excursion to ≤35.5 V during 10/1000 μs surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. |
Use Scenario: Analog output lines from pressure or temperature sensors routed through noisy factory environments. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt ESD and switching noise away from precision ADC inputs. Use Value: 1.0 μA leakage at 22 V avoids signal offset errors; 35.5 V clamping preserves 24 V sensor supply headroom. |
| DC-DC Converter Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: 48 V input stage of isolated buck converter subjected to inductive kickback from upstream relays. IC Role / Device Role / Timing Role: Primary transient suppressor on main input rail, coordinated with bulk capacitance to absorb energy. Use Value: 1500 W PPPM rating handles repetitive 100 ms surges without degradation; 75 °C/W RθJA enables thermal stability on minimal copper. |
Use Scenario: High-side N-channel MOSFET gate drive traces adjacent to PWM power stages. IC Role / Device Role / Timing Role: Localized TVS at gate driver IC output to prevent dv/dt-induced false turn-on from coupled transients. Use Value: Sub-ns response time ensures clamping occurs before gate threshold is exceeded; 24.4–26.9 V VBR aligns with typical 24 V gate bias rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for lower-energy transients or space-constrained consumer boards; not recommended for automotive load dump | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 ±8 kV contact discharge only |
| SMCJ22CA-M3/9AT | Bidirectional variant; same VWM (22 V), symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN bus) | Choose only if bidirectional protection is mandated; unidirectional SMCJ22A-M3/9AT offers superior leakage and lower cost for DC rails |
Compared with SMAJ22A-E3/61T, SMCJ22A-M3/9AT delivers 275 % higher surge power handling and better thermal dissipation; versus SMCJ22CA-M3/9AT, it provides tighter leakage control and lower forward voltage drop in DC applications where polarity is fixed.
Availability
SMCJ22A-M3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface design, and DC-DC converter input staging requiring stable component supply and full traceability.
Supply support for SMCJ22A-M3/9AT 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, and protection devices with emphasis on reliability and automotive qualification.
The SMCJ series was developed specifically for high-energy transient suppression in harsh-environment applications including automotive power distribution, industrial motor controls, and telecom infrastructure.
FAQ
What is the breakdown voltage tolerance for SMCJ22A-M3/9AT?
The SMCJ22A-M3/9AT has a specified breakdown voltage range of 24.4 V to 26.9 V at 1 mA test current, measured per ANSI/IEEE C62.35 standards. This 10.2 % tolerance ensures consistent clamping behavior across production lots while allowing margin for thermal drift and manufacturing variation. The device remains fully functional within this window and does not require binning for most protection applications.
Is SMCJ22A-M3/9AT qualified for automotive use?
SMCJ22A-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), but it is not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 certification, the equivalent part is SMCJ22A-HM3_X (e.g., SMCJ22A-HM3_A/I), which carries the HM3 suffix and explicit qualification documentation. Engineers must verify qualification status via Vishay's official part numbering matrix before deployment in safety-critical vehicle systems.
How does the clamping voltage of SMCJ22A-M3/9AT compare to its stand-off voltage?
The SMCJ22A-M3/9AT has a 22 V stand-off voltage (VWM) and a maximum clamping voltage (VC) of 35.5 V at 42.3 A peak pulse current. This 61 % overvoltage margin ensures protected circuits remain below absolute maximum ratings during surge events. The clamping ratio (VC/VWM = 1.61) reflects optimized junction design for rapid avalanche onset and low dynamic impedance under transient stress.
Can SMCJ22A-M3/9AT be used in bidirectional signal lines?
No - SMCJ22A-M3/9AT is strictly unidirectional and features a cathode band marking. Applying reverse polarity beyond its rated standoff voltage will cause permanent damage. For bidirectional protection, use the SMCJ22CA-M3/9AT variant, which provides symmetrical clamping in both directions and no polarity marking. Mixing unidirectional and bidirectional variants in the same design requires careful schematic and layout review.
What is the thermal resistance of SMCJ22A-M3/9AT, and how does it affect layout?
The SMCJ22A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain safe junction temperatures during repetitive surges, designers must allocate adequate copper area and avoid routing heat-sensitive components nearby. Derating curves in Figure 2 show power capability drops to ~50 % at 100 °C ambient.
SMCJ22A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 42.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ22A-M3/9AT FAQ
1.How can I place an order for SMCJ22A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ22A-M3/9AT 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 SMCJ22A-M3/9AT reliable?
The price and inventory of SMCJ22A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ22A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ22A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ22A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ22A-M3/9AT?
SMCJ22A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ22A-M3/9AT 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 SMCJ22A-M3/9AT?
For technical support, including SMCJ22A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ22A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ22A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ22A-M3/9AT 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 SMCJ22A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ22A-M3/9AT?
All SMCJ22A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ22A-M3/9AT, 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 SMCJ22A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ22A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ22A-M3/9AT Tags
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