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Vishay General Semiconductor - Diodes Division SMAJ22CAHM3/I
- Part No.:
- SMAJ22CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAHM3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,234
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Product details
Overview
SMAJ22CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 22 V standoff voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤35.5 V at 11.3 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding automotive sensor signal lines against ESD and load dump.
For engineers reviewing the SMAJ22CAHM3/I datasheet, SMAJ22CAHM3/I pinout, SMAJ22CAHM3/I application, or SMAJ22CAHM3/I equivalent, this device delivers AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for automotive-grade production designs requiring long-term reliability and supply chain traceability.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction enables fast response (<1 ps), low incremental surge resistance, and stable clamping performance up to 150 °C junction temperature.
The device is rated for 400 W peak pulse power (10/1000 μs), derated to 300 W above 78 V, and supports repetitive surge events at 0.01 % duty cycle. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, enabling compact PCB layouts without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 24.4 V / 26.9 V at IT = 1 mA - guaranteed breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | ≤35.5 V at 11.3 A - clamping voltage limits downstream IC stress during 10/1000 μs surges. |
| PPPM | 400 W - peak pulse power handling capacity; sufficient for ISO 7637-2 Pulse 1/2a/5a automotive transients. |
| IPPM | 11.3 A - maximum non-repetitive surge current; validated with 0.2" × 0.2" copper pad layout per JEDEC standards. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive environments. |
| Package | SMA (DO-214AC) - surface-mount, low-profile package compatible with automated SMT assembly and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge energy from either direction; connects to protected line (e.g., CAN_H or LIN bus). |
| Cathode | Transient current exit (bidirectional) | Completes surge path to ground or reference rail; requires low-inductance grounding for optimal clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and supports lead-free reflow soldering (J-STD-020 MSL Level 1). |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as ISO 7637-2 Load Dump (Pulse 5a) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic-level interfaces. |
| Fast response time (<1 ps) | Engages before transient voltage propagates into protected ICs, preventing latch-up or gate oxide damage. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine compartments subject to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤35.5 V, preserving 12-bit ADC accuracy and preventing ESD-induced calibration drift. |
Use Scenario: Shielding CAN_H/CAN_L differential pair in factory automation controllers exposed to motor drive noise and relay switching spikes. IC Role / Device Role / Timing Role: Paired SMAJ22CAHM3/I devices (one per line) referenced to chassis ground. Use Value: Maintains CAN signal integrity by clamping common-mode surges while preserving <1 ns timing skew between lines. |
| Telecom Power Supply Input | Consumer USB Port ESD Protection |
|
Use Scenario: Safeguarding 24 V DC input stage of PoE-powered network switches against lightning-induced surges on building wiring. IC Role / Device Role / Timing Role: Primary-stage TVS upstream of DC-DC converter input filter. Use Value: Absorbs 400 W pulses without failure, reducing need for secondary crowbar circuits and lowering BOM cost. |
Use Scenario: Secondary-level protection on VBUS line of USB 2.0 ports in smart home hubs subjected to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after USB connector but before port controller IC. Use Value: Clamps 8 kV HBM discharges to <35.5 V within picoseconds, preventing latch-up in USB transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CAHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for commercial-automotive hybrids where halogen content is not restricted. | Select when halogen-free requirement is waived and cost optimization is prioritized. |
| SMBJ22CAHM3/I | Same VWM/VBR/VC, but SMB package (DO-214AA) offers 600 W PPPM and higher IPPM (17.5 A). | Better suited for higher-energy transients (e.g., ISO 16750-2 Pulse 5b) where board space allows larger footprint. | Choose when surge immunity margin must exceed 400 W and PCB layout permits 5.3 mm × 4.6 mm package. |
Compared with SMAJ22CAHE3/I, the SMAJ22CAHM3/I adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMBJ22CAHM3/I, it trades 200 W pulse power headroom for 30 % smaller PCB area - enabling tighter routing in space-constrained automotive modules.
Availability
SMAJ22CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN networks, telecom power inputs, and consumer USB ESD protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ22CAHM3/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability and automotive-grade validation.
The SMAJ series targets high-reliability transient suppression in harsh environments, with design focus on AEC-Q101 compliance, low clamping voltage, and compatibility with automated SMT manufacturing.
FAQ
What is the maximum clamping voltage of the SMAJ22CAHM3/I under a 10/1000 μs surge?
The SMAJ22CAHM3/I clamps to a maximum of 35.5 V at its rated peak pulse current of 11.3 A under the standardized 10/1000 μs waveform. This value is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC test conditions and remains stable across its full operating temperature range of –55 °C to +150 °C. The clamping voltage directly determines the peak stress imposed on downstream ICs during transient events.
Is the SMAJ22CAHM3/I suitable for automotive applications?
Yes, the SMAJ22CAHM3/I is AEC-Q101 qualified and specifically designed for automotive use. Its halogen-free, RoHS-compliant construction (HM3 suffix), MSL Level 1 rating, and operation up to +150 °C junction temperature meet stringent requirements for engine control units, body control modules, and ADAS sensor interfaces. The bidirectional configuration supports protection of differential buses like LIN and CAN without polarity concerns.
How does the SMAJ22CAHM3/I differ from unidirectional SMAJ22A variants?
The SMAJ22CAHM3/I is bidirectional, meaning it provides symmetrical clamping for voltage transients of either polarity - essential for AC-coupled or differential signal lines. In contrast, unidirectional variants like SMAJ22AHM3/I have a cathode band marking and only protect against reverse-polarity surges. Both share identical VWM (22 V), VBR, and PPPM ratings, but the CA version eliminates polarity-dependent layout constraints.
What is the thermal resistance of the SMAJ22CAHM3/I, and how does it affect PCB layout?
The SMAJ22CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value assumes standard FR-4 PCB material and natural convection cooling. To maintain TJ ≤ 150 °C under worst-case 3.3 W steady-state dissipation, designers must ensure adequate copper area and avoid enclosing the device in thermally insulating enclosures or conformal coatings.
Does the SMAJ22CAHM3/I require a heatsink for standard operation?
No, the SMAJ22CAHM3/I does not require an external heatsink for normal transient suppression operation because its 3.3 W steady-state power dissipation (PD) is managed entirely through PCB copper thermal spreading. The device relies on thermal conduction via its leads and solder joints into the board's copper planes. Heatsinking is unnecessary unless operating continuously near PD limit in high-ambient-temperature environments (>85 °C), where enhanced copper pour or internal layers may be added instead.
SMAJ22CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 11.3A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ22CAHM3/I FAQ
1.How can I place an order for SMAJ22CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAHM3/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 SMAJ22CAHM3/I reliable?
The price and inventory of SMAJ22CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ22CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAHM3/I?
SMAJ22CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAHM3/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 SMAJ22CAHM3/I?
For technical support, including SMAJ22CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAHM3/I requirements.
6.How does Aetrix verify that SMAJ22CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAHM3/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 SMAJ22CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ22CAHM3/I?
All SMAJ22CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAHM3/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 SMAJ22CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ22CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22CAHM3/I Tags
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