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Vishay General Semiconductor - Diodes Division SMAJ22CAHM3/H
- Part No.:
- SMAJ22CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAHM3/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,693
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Product details
Overview
SMAJ22CAHM3/H 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 induced surges.
For engineers reviewing the SMAJ22CAHM3/H datasheet, SMAJ22CAHM3/H pinout, SMAJ22CAHM3/H application, or SMAJ22CAHM3/H equivalent, this device delivers AEC-Q101 qualified surge immunity, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive and industrial PCB designs requiring validated transient suppression without layout redesign.
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 time (<1 ps) and low incremental surge resistance, ensuring effective clamping before downstream ICs experience overstress.
The device sustains 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above that threshold. Thermal resistance is specified at RθJA = 120 °C/W (on 0.2" × 0.2" copper pads), supporting operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 24.4 V / 26.9 V at IT = 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | ≤35.5 V at 11.3 A - clamping voltage limiting stress on protected circuitry during surge |
| PPPM | 400 W (10/1000 μs) - peak transient energy absorption capability at rated conditions |
| IPPM | 11.3 A - maximum non-repetitive surge current the device safely conducts |
| Junction Temp Range | –55 °C to +150 °C - operational envelope compatible with under-hood automotive environments |
| Package | SMA (DO-214AC) - surface-mount footprint with 5.28 mm × 4.50 mm outline and J-STD-020 MSL Level 1 rating |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with UL 94 V-0 flammability rating and JESD 22-B102 solderability standards. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Current entry point in one polarity | Acts as cathode when reverse-biased; forms symmetrical conduction path with Terminal 2 |
| Cathode (Terminal 2) | Current exit point in one polarity | Acts as anode when reverse-biased; enables bidirectional clamping without external orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial supply chains (suffix HM3) |
| 400 W peak pulse power | Withstands high-energy transients common in 12 V/24 V vehicle systems without degradation |
| Fast response time | <1 ps junction response ensures clamping initiates before most ICs experience overvoltage damage |
| Low clamping ratio (VC/VBR) | ~1.43 - tight ratio minimizes voltage overshoot during surge events, preserving signal integrity |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Enables compliance with automotive EMC requirements while maintaining <100 ns response margin relative to microcontroller GPIO tolerance limits. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-mode protector mounted upstream of optocoupler input stage to prevent false triggering and isolation barrier overstress. Use Value: Extends mean time between failures (MTBF) by absorbing >1000 surges at 400 W without parameter shift, verified per IEC 61000-4-5. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary-side transient protection on USB-C PD adapter output rails exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 150 pF at 0 V) bidirectional clamp minimizing signal distortion on 5–20 V regulated outputs. Use Value: Prevents latch-up in synchronous rectifier controllers during repeated 8 kV contact ESD events per IEC 61000-4-2. |
Use Scenario: Primary protection on Ethernet PHY interfaces and POTS line cards subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: First-stage crowbar device in multi-tiered protection scheme, coordinated with GDTs and series impedance. Use Value: Limits let-through voltage to <35.5 V within 1 μs, enabling downstream TVS arrays to handle residual energy without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CAHE3/H | Same electrical specs; RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free finish | Acceptable for commercial/industrial use where halogen-free mandate does not apply | Select when cost sensitivity outweighs automotive environmental compliance requirements |
| SMBJ22CAHM3 | Higher 600 W PPPM; larger SMB (DO-214AA) package; same VWM/VBR/VC ratings | Better suited for higher-energy surge environments (e.g., alternator load dump) where board space permits larger footprint | Choose when system-level surge testing exceeds 400 W and thermal dissipation margin is constrained |
Compared with SMAJ22CAHM3/H, SMAJ22CAHE3/H offers identical protection performance without halogen-free certification, while SMBJ22CAHM3 provides 50 % higher pulse power handling in a physically larger package - enabling trade-offs between board density, environmental compliance, and surge margin.
Availability
SMAJ22CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O terminals, and telecom line card designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ22CAHM3/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series targets high-volume, high-reliability transient suppression in automotive, industrial, and communications systems - engineered for rapid response, repeatable clamping, and qualification to AEC-Q101 and industry surge standards.
FAQ
What is the clamping voltage of SMAJ22CAHM3/H at its rated peak pulse current?
The SMAJ22CAHM3/H clamps to a maximum of 35.5 V when subjected to its rated peak pulse current of 11.3 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for protected circuits.
Is SMAJ22CAHM3/H suitable for automotive applications?
Yes, SMAJ22CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting stringent automotive reliability and environmental requirements. It is explicitly designated for use in automotive sensor units, infotainment interfaces, and body control modules per Vishay's ordering documentation.
How does the bidirectional configuration of SMAJ22CAHM3/H affect PCB layout?
The bidirectional nature of SMAJ22CAHM3/H eliminates polarity concerns during placement - no cathode band marking is present, and either terminal may connect to line or return. This simplifies layout, reduces assembly errors, and supports symmetric protection schemes on differential buses like CAN or RS-485 without directional routing constraints.
What is the thermal resistance of SMAJ22CAHM3/H, and how does it impact power dissipation?
SMAJ22CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. At its rated 3.3 W steady-state power dissipation, this yields ~400 °C rise - confirming that the device is intended for transient-only duty (0.01 % duty cycle), not continuous power handling.
Does SMAJ22CAHM3/H meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ22CAHM3/H meets MSL Level 1 per J-STD-020, meaning it is not moisture-sensitive and can be subjected to standard lead-free reflow profiles (peak 260 °C) without baking or special handling - simplifying manufacturing and reducing process risk in high-volume SMT lines.
SMAJ22CAHM3/H 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/H FAQ
1.How can I place an order for SMAJ22CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAHM3/H 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/H reliable?
The price and inventory of SMAJ22CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ22CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAHM3/H?
SMAJ22CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAHM3/H 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/H?
For technical support, including SMAJ22CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAHM3/H requirements.
6.How does Aetrix verify that SMAJ22CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ22CAHM3/H?
All SMAJ22CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ22CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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