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Vishay General Semiconductor - Diodes Division SMCJ22CAHM3_A/I
- Part No.:
- SMCJ22CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ22CAHM3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,393
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Product details
Overview
SMCJ22CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 22 V standoff voltage (VWM), 35.5 V maximum clamping voltage (VC) at 42.3 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 μs waveform), commonly deployed on automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ22CAHM3_A/I datasheet, SMCJ22CAHM3_A/I pinout, SMCJ22CAHM3_A/I application, or SMCJ22CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive load switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance values optimized for surface-mount PCB layouts using minimum recommended pad dimensions. Its MSL Level 1 rating confirms suitability for standard reflow profiles up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 24.4 V / 26.9 V - Breakdown occurs within this range at 1 mA test current, ensuring reliable turn-on margin |
| VC @ IPPM | 35.5 V - Clamps 10/1000 μs surge to ≤35.5 V at 42.3 A, limiting downstream IC stress |
| PPPM | 1500 W - Peak pulse power handling capability under standardized transient waveform |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads |
| TJ max | +150 °C - Maximum allowable junction temperature for sustained operation |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 2.06 mm height and 7.75 mm body length |
Pinout & Package
SMCJ22CAHM3_A/I uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount device with no cathode marking (bidirectional configuration). Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive transients; functions identically to Anode terminal during negative transients |
| Cathode | Transient return path (bidirectional) | Acts as anode during negative transients; electrically symmetric to Anode terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-201 Class 2 whisker resistance and EU RoHS Directive 2011/65/EU |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = 8.6 V) and higher energy absorption efficiency |
| MSL Level 1 | Compatible with standard Pb-free reflow profiles up to 260 °C peak without dry-pack requirements |
| Glass passivated junction | Provides stable VBR tolerance and long-term leakage stability under thermal stress |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping surges before reaching signal conditioning circuitry. Use Value: Maintains signal integrity by limiting voltage excursions to ≤35.5 V during 1500 W transients, preserving ADC input range and preventing latch-up in microcontrollers. | Use Scenario: Safeguarding PLC digital input modules and RS-485 transceivers against ESD and inductive kickback from solenoid/relay coils. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pair or single-ended line, absorbing both polarities of fast-rising transients. Use Value: Eliminates need for separate unidirectional devices per line, reducing BOM count while delivering symmetrical 35.5 V clamping in either direction. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from lightning-induced surges on twisted-pair cabling in outdoor access points. IC Role / Device Role / Timing Role: Primary-level surge protector mounted at RJ45 jack, coordinated with secondary GDT or MOV stages. Use Value: Withstands repeated 10/1000 μs surges up to 42.3 A without degradation, meeting IEC 61000-4-5 Level 3 immunity requirements. | Use Scenario: Suppressing line-to-line and line-to-ground transients on AC-DC adapter primary-side rectifier outputs. IC Role / Device Role / Timing Role: Fast-response clamp across bulk capacitor terminals, diverting surge energy away from switching MOSFETs and controllers. Use Value: Halogen-free construction supports eco-label certifications (e.g., Energy Star, EPEAT), while 1500 W rating handles EN 61000-4-4 burst events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CAHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for space-constrained consumer designs with lower surge exposure | Select when board area is critical and peak surge energy is ≤400 W |
| SMCJ22AHE3_A/I | Unidirectional version; identical VWM, VBR, VC, but requires correct polarity orientation | Applicable only where DC bias or signal polarity is fixed and known | Choose only if system architecture guarantees consistent polarity and allows cathode marking |
Compared with SMAJ22CAHE3_A/I and SMCJ22AHE3_A/I, SMCJ22CAHM3_A/I delivers higher surge robustness (1500 W vs. 400 W) and automotive qualification, while its bidirectional symmetry eliminates layout polarity concerns-making it optimal for differential signaling and harsh-environment deployments.
Availability
SMCJ22CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SMCJ22CAHM3_A/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in demanding environments where AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance are mandatory.
FAQ
What does the "HM3" suffix indicate in SMCJ22CAHM3_A/I?
The "HM3" suffix in SMCJ22CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade "E3" or "M3" versions and confirms compliance with JEDEC J-STD-201 Class 2 whisker resistance and automotive reliability standards. SMCJ22CAHM3_A/I meets all stress-test requirements defined in AEC-Q101 for transient suppressors.
Is SMCJ22CAHM3_A/I suitable for protecting USB or HDMI signal lines?
No, SMCJ22CAHM3_A/I is not appropriate for USB or HDMI signal line protection due to its high junction capacitance (>1000 pF at zero bias) and relatively high clamping voltage (35.5 V), which would distort high-speed signals and exceed data-line voltage tolerances. SMCJ22CAHM3_A/I is intended for power rails and low-frequency signal lines such as sensor outputs or industrial I/O-not high-speed digital interfaces.
How does the bidirectional design of SMCJ22CAHM3_A/I affect PCB layout?
The bidirectional design of SMCJ22CAHM3_A/I eliminates polarity sensitivity, allowing placement across any two nodes without regard to anode/cathode orientation. This simplifies layout, reduces assembly errors, and enables use in AC-coupled or differential circuits like RS-485 or CAN bus. SMCJ22CAHM3_A/I has no band marking, confirming its symmetric internal structure.
What is the maximum surge current SMCJ22CAHM3_A/I can handle at elevated ambient temperatures?
At 85 °C ambient, SMCJ22CAHM3_A/I's peak pulse current (IPPM) derates to approximately 32 A, based on the derating curve in Figure 2 of Vishay document 88394. This reflects a ~25 % reduction from its 42.3 A rating at 25 °C, due to thermal limitations of the SMC package and junction-to-ambient resistance (75 °C/W). SMCJ22CAHM3_A/I maintains full 1500 W capability only at TA ≤ 25 °C.
Does SMCJ22CAHM3_A/I require heatsinking for continuous operation?
No, SMCJ22CAHM3_A/I does not require external heatsinking for transient suppression duty cycles (e.g., occasional surges), as its 6.5 W steady-state power dissipation (PD) is managed via PCB copper pads. However, for repetitive surge conditions exceeding 1 Hz, thermal performance must be validated using the transient thermal impedance curve (Figure 5) and actual board layout-SMCJ22CAHM3_A/I relies on 8.0 mm × 8.0 mm copper pads per terminal for specified RθJA.
SMCJ22CAHM3_A/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ22CAHM3_A/I FAQ
1.How can I place an order for SMCJ22CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ22CAHM3_A/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 SMCJ22CAHM3_A/I reliable?
The price and inventory of SMCJ22CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ22CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ22CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ22CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ22CAHM3_A/I?
SMCJ22CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ22CAHM3_A/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 SMCJ22CAHM3_A/I?
For technical support, including SMCJ22CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ22CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ22CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ22CAHM3_A/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 SMCJ22CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ22CAHM3_A/I?
All SMCJ22CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ22CAHM3_A/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 SMCJ22CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ22CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ22CAHM3_A/I Tags
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