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Vishay General Semiconductor - Diodes Division SMCJ22CA-M3/9AT
- Part No.:
- SMCJ22CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ22CA-M3/9AT.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ22CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 22 V standoff voltage, 1500 W peak pulse power rating, and clamping voltage of 35.5 V at 42.3 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ22CA-M3/9AT datasheet, SMCJ22CA-M3/9AT pinout, SMCJ22CA-M3/9AT application, or SMCJ22CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W 10/1000 µs surge rating, 35.5 V VC at IPPM, -55 °C to +150 °C operating junction temperature, and halogen-free RoHS-compliant M3 termination.
Technical Context
This TVS diode operates as a voltage-clamping device across signal or power rails, responding within picoseconds to transient overvoltages exceeding its reverse standoff voltage (VWM = 22 V). Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity sensitivity in AC-coupled or differential lines.
The device uses a glass-passivated silicon junction optimized for low incremental surge resistance (typical <0.1 Ω), enabling effective energy diversion without thermal runaway. It meets J-STD-020 MSL Level 1 and is rated for 1500 W peak pulse power under standardized 10/1000 µs waveform conditions on specified copper pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 24.4 V / 26.9 V - Breakdown voltage range at 1 mA test current; defines clamping onset threshold |
| VC @ IPPM | 35.5 V - Clamped voltage at 42.3 A peak pulse current; determines protected circuit's maximum transient exposure |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; defines surge energy absorption capacity |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 8.13 mm footprint and 3.20 mm height; compatible with automated placement |
| RoHS Status | Halogen-free, RoHS-compliant (M3 suffix) - Meets environmental compliance requirements for commercial-grade applications |
Pinout & Package
SMCJ22CA-M3/9AT is housed in an SMC (DO-214AB) surface-mount package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking; both terminals are functionally symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during positive transient | One side of symmetrical PN junction; conducts when voltage exceeds +VBR |
| Cathode | Current entry point during negative transient | Other side of symmetrical PN junction; conducts when voltage exceeds –VBR |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR (24.4–26.9 V) and VC (35.5 V) in both directions-enables protection of AC, differential, or floating signal paths without polarity constraints |
| 1500 W surge rating | Handles 42.3 A peak pulse current under 10/1000 µs waveform-sufficient for IEC 61000-4-5 Level 4 (4 kV) surge testing with proper PCB layout |
| Low clamping ratio | VC/VWM = 1.61-minimizes overvoltage stress on downstream components during transient events |
| MSL Level 1 | Reflow-compatible up to 260 °C peak-supports standard lead-free assembly without moisture sensitivity concerns |
| Halogen-free construction | M3 suffix confirms compliance with JEDEC J-STD-20 and RoHS Annex II-meets stringent environmental requirements for global OEMs |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in 12 V/24 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal pair or supply rail to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or gate oxide damage in automotive-grade microcontrollers and transceivers by limiting clamped voltage to 35.5 V during 1500 W surges. | Use Scenario: Safeguarding digital input/output channels on programmable logic controller (PLC) modules exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff-and-clamp protector mounted directly at connector interface to shunt surge energy before reaching isolation barriers or FPGA I/O banks. Use Value: Enables robust 24 V DC I/O design with guaranteed 35.5 V clamping ceiling, supporting IEC 61000-4-4 EFT and IEC 61000-4-5 surge immunity compliance. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY interfaces, DSL line drivers, or RS-485 transceivers from lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS placed differential-mode across twisted-pair lines or common-mode across line-to-ground to suppress fast-rising transients. Use Value: Provides sub-36 V clamping with <1 ns response time-preserves signal integrity while meeting GR-1089-CORE Level 3 surge requirements. | Use Scenario: Secondary-side overvoltage suppression on 24 V output rails of AC/DC adapters used in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Final-stage clamp preventing secondary-side transient coupling into USB-PD controllers or PMICs during hot-plug or short-circuit recovery. Use Value: Limits transient overshoot to ≤35.5 V during 10/1000 µs surges, protecting 3.3 V/5 V logic supplies downstream of buck converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC22CA | Lower PPPM (1000 W), higher VC (38.0 V at 26.3 A), same VWM (22 V) and package (SMC) | Reduced surge margin; suitable only where lower energy threats are expected (e.g., consumer-grade I/O) | Select SMCJ22CA-M3/9AT when full 1500 W IEC 61000-4-5 compliance is required; SAC22CA fits cost-sensitive, lower-risk applications. |
| 1.5KE22CA | Through-hole DO-201 package, same VWM (22 V) and bidirectional configuration, but higher VC (36.0 V at 41.7 A) | Requires PCB redesign for through-hole mounting; not suitable for high-density SMT layouts | Choose SMCJ22CA-M3/9AT for automated SMT production and space-constrained designs; 1.5KE22CA remains viable for legacy through-hole systems. |
Compared with SAC22CA and 1.5KE22CA, the SMCJ22CA-M3/9AT delivers superior surge energy handling (1500 W vs. 1000 W or 1500 W with larger footprint), tighter clamping (35.5 V vs. 36.0–38.0 V), and SMT compatibility-making it optimal for next-generation automotive, industrial, and telecom modules requiring high reliability and miniaturization.
Availability
SMCJ22CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line cards, and consumer power adapter designs requiring stable component supply and halogen-free compliance.
Supply support for SMCJ22CA-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 readiness, and precise clamping performance are critical.
FAQ
What is the clamping voltage of the SMCJ22CA-M3/9AT under maximum rated surge current?
The SMCJ22CA-M3/9AT clamps to 35.5 V at its rated peak pulse current of 42.3 A under the standardized 10/1000 µs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, as specified in the Vishay datasheet document 88394. The clamping voltage defines the maximum voltage seen by protected circuitry during surge events and is a key parameter for ensuring downstream ICs remain within their absolute maximum ratings. The SMCJ22CA-M3/9AT maintains this performance consistently across its operating temperature range.
Is the SMCJ22CA-M3/9AT suitable for automotive applications?
Yes, the SMCJ22CA-M3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/9AT variant is commercial-grade and not AEC-Q101 certified. It is widely used in non-safety-critical automotive subsystems-including body control modules, infotainment interfaces, and sensor signal conditioning-where its 1500 W surge rating, -55 °C to +150 °C operating range, and halogen-free construction meet functional requirements. For ASIL-B/C systems, engineers must specify the HM3_X variant and verify qualification status via Vishay's official documentation. The SMCJ22CA-M3/9AT itself supports automotive thermal and mechanical stress profiles but lacks formal AEC-Q101 certification.
How does the bidirectional configuration of the SMCJ22CA-M3/9AT affect circuit layout?
The bidirectional configuration of the SMCJ22CA-M3/9AT eliminates polarity marking and allows symmetric placement across any two-node network-such as differential signal pairs, AC-coupled lines, or floating power rails-without regard to anode/cathode orientation. Unlike unidirectional TVS diodes, it requires no band identification during placement, reducing assembly errors and simplifying layout for balanced topologies. This symmetry also ensures identical clamping behavior for positive and negative transients, making the SMCJ22CA-M3/9AT ideal for protecting RS-485, CAN, or Ethernet interfaces where voltage polarity reversal is possible. No changes to PCB silkscreen or pick-and-place programming are needed beyond standard SMC footprint alignment.
What is the thermal resistance of the SMCJ22CA-M3/9AT, and how does it impact power dissipation?
The SMCJ22CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout (0.31″ × 0.31″ copper pads), and a junction-to-lead resistance (RθJL) of 15 °C/W. These values determine steady-state power derating: at 50 °C ambient, its continuous power dissipation (PD) is rated at 6.5 W. For transient events, thermal mass dominates, so RθJA governs long-term reliability during repeated surges. Engineers must ensure adequate copper area and avoid thermal bottlenecks near the SMCJ22CA-M3/9AT to maintain junction temperature below 150 °C. The SMCJ22CA-M3/9AT's low RθJL supports efficient heat conduction into PCB traces or heatsinks during high-duty-cycle applications.
Does the SMCJ22CA-M3/9AT have a defined junction capacitance, and is it suitable for high-speed data lines?
No, junction capacitance is not specified for the SMCJ22CA-M3/9AT in the Vishay datasheet 88394 because it is not characterized or guaranteed for high-frequency signal integrity applications. While typical TVS diodes in this family exhibit ~100–500 pF at zero bias (based on related SMCJ series curves), the SMCJ22CA-M3/9AT's primary design focus is high-energy transient suppression-not low-capacitance signal line protection. For USB 2.0, HDMI, or high-speed serial interfaces, dedicated low-capacitance TVS arrays (e.g., USBLC6-2SC6) are recommended instead. The SMCJ22CA-M3/9AT remains appropriate for lower-speed analog signals, power rails, and control lines where capacitance is non-critical, but should not be placed directly in series with >10 Mbps data paths without empirical validation.
SMCJ22CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ22CA-M3/9AT FAQ
1.How can I place an order for SMCJ22CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ22CA-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 SMCJ22CA-M3/9AT reliable?
The price and inventory of SMCJ22CA-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 SMCJ22CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ22CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ22CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ22CA-M3/9AT?
SMCJ22CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ22CA-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 SMCJ22CA-M3/9AT?
For technical support, including SMCJ22CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ22CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ22CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ22CA-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 SMCJ22CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ22CA-M3/9AT?
All SMCJ22CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ22CA-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 SMCJ22CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ22CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ22CA-M3/9AT Tags
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