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Vishay General Semiconductor - Diodes Division SMAJ22CAHE3/61
- Part No.:
- SMAJ22CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAHE3/61.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
SMAJ22CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust ESD and surge protection on signal and power lines. It features a 22 V standoff voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V clamping voltage (VC) at 11.3 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ22CAHE3/61 datasheet, SMAJ22CAHE3/61 pinout, SMAJ22CAHE3/61 application, or SMAJ22CAHE3/61 equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, SMA (DO-214AC) package thermal performance, and compliance with IEC 61000-4-2/4-5 surge immunity standards.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 22 V), then rapidly avalanches to limit transient overvoltages across protected nodes. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The SMAJ22CAHE3/61 is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation on standard PCB copper pads without forced cooling in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse working voltage before significant leakage begins |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - Confirmed avalanche onset range ensuring predictable turn-on margin |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 400 W - Peak pulse power handling per IEC 61000-4-5 waveform, sufficient for Level 4 surge immunity |
| IPPM | 11.3 A - Maximum non-repetitive surge current supported without degradation |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial enclosures |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTOL and TC |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, MSL Level 1 compliant (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | One terminal of symmetrical PN junction; conducts surge current in either direction when V > VBR |
| Cathode | Transient current sink (bidirectional) | Second terminal of symmetrical PN junction; identical conduction behavior to anode - no polarity distinction in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for orientation-aware layout on differential or AC-coupled lines |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, high-temperature operating life, and ESD robustness |
| 400 W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) without derating on standard 5 mm × 5 mm copper pads |
| Low clamping ratio (VC/VBR) | 1.47 (35.5 V / 24.4 V min) - tighter voltage control than typical Zener-based protectors, reducing IC stress margin requirements |
| MSL Level 1 | Zero floor life limitation - can be stored indefinitely at ≤30 °C/60% RH and assembled without baking |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and MEMS pressure sensors from load-dump and ISO 7637-2 pulses in engine control modules. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector entry point to clamp transients before reaching signal conditioning circuitry. Use Value: Maintains signal integrity by limiting voltage excursion to ≤35.5 V during 10/1000 μs surges up to 11.3 A, preserving ADC reference stability and microcontroller I/O tolerance. | Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element across input terminals to absorb both positive and negative polarity transients from long cable runs. Use Value: Prevents latch-up or permanent damage to op-amp front-end stages by clamping to 35.5 V while maintaining <1 μA leakage at 22 V operating voltage. |
| Consumer USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response shunt device placed after common-mode choke to handle contact discharge per IEC 61000-4-2 ±15 kV. Use Value: Sub-nanosecond response time limits voltage overshoot to <35.5 V, preventing gate oxide rupture in USB transceivers without adding series impedance. | Use Scenario: Primary surge suppression on POTS line interface cards subjected to lightning-induced surges per ITU-T K.20/K.44. IC Role / Device Role / Timing Role: First-stage protector across tip/ring pair to divert bulk energy before gas discharge tube or MOV secondary stage. Use Value: 400 W peak power rating enables handling of 10/1000 μs surges up to 11.3 A without thermal runaway, extending system MTBF in central office environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated | Choose SMAJ22CA-M3/61 when environmental compliance requires halogen-free packaging |
| SMBJ22CAHE3/61 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 20 % larger footprint, 15 % lower RθJA (100 °C/W) | Better thermal dissipation in high-duty-cycle surge environments; requires PCB layout change | Choose SMBJ22CAHE3/61 only if sustained surge repetition or higher ambient temperatures demand improved thermal margin |
Compared with SMAJ22CA-M3/61, the SMAJ22CAHE3/61 offers identical protection performance with standard RoHS compliance; versus SMBJ22CAHE3/61, it trades 20 % board area reduction for slightly higher thermal resistance - optimal for space-constrained automotive modules where single-event surge dominates.
Availability
SMAJ22CAHE3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, consumer USB interface hardening, and telecom line card surge suppression requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ22CAHE3/61 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, precision, and automotive-grade validation.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial automation, and communications infrastructure where robustness and qualification rigor are mandatory.
FAQ
What is the clamping voltage of the SMAJ22CAHE3/61 under a 10/1000 μs surge?
The SMAJ22CAHE3/61 clamps to a maximum of 35.5 V at its rated peak pulse current of 11.3 A under a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads), and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ22CAHE3/61 maintains this clamping performance bidirectionally due to its symmetrical junction structure.
Is the SMAJ22CAHE3/61 suitable for automotive applications?
Yes, the SMAJ22CAHE3/61 is AEC-Q101 qualified and explicitly intended for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its qualification covers high-temperature operating life, thermal cycling, and ESD robustness. The SMAJ22CAHE3/61 meets the reliability and environmental stress requirements defined in AEC-Q101 Rev D, making it appropriate for under-hood and cabin-mounted systems.
Does the SMAJ22CAHE3/61 have polarity markings on the package?
No, the SMAJ22CAHE3/61 is a bidirectional TVS diode and carries no polarity marking on the SMA (DO-214AC) package. Unlike unidirectional variants (e.g., SMAJ22A), the CA suffix indicates symmetrical breakdown behavior in both directions, eliminating orientation sensitivity during placement. This simplifies PCB layout and reduces assembly errors in differential or AC-coupled protection schemes using the SMAJ22CAHE3/61.
What is the maximum operating temperature for the SMAJ22CAHE3/61?
The SMAJ22CAHE3/61 has a maximum junction temperature (TJ) rating of +150 °C and an operating storage temperature range of -55 °C to +150 °C. Its thermal resistance values - RθJA = 120 °C/W and RθJL = 30 °C/W - allow reliable operation in high-ambient environments such as automotive powertrain modules or industrial motor drives, provided standard PCB copper pad layouts are followed. The SMAJ22CAHE3/61 remains fully functional across this full range without parameter drift or derating.
How does the SMAJ22CAHE3/61 compare to unidirectional SMAJ22A in circuit implementation?
The SMAJ22CAHE3/61 provides identical VWM, VBR, and VC specifications as the unidirectional SMAJ22A but operates symmetrically in both voltage polarities - critical for protecting AC signals, differential buses (e.g., RS-485), or circuits where transient polarity is unpredictable. Unlike SMAJ22A, which requires correct cathode orientation, the SMAJ22CAHE3/61 eliminates orientation dependency and simplifies layout. Both share the same SMA package, thermal profile, and AEC-Q101 qualification.
SMAJ22CAHE3/61 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22CAHE3/61 FAQ
1.How can I place an order for SMAJ22CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAHE3/61 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 SMAJ22CAHE3/61 reliable?
The price and inventory of SMAJ22CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ22CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAHE3/61?
SMAJ22CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAHE3/61 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 SMAJ22CAHE3/61?
For technical support, including SMAJ22CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ22CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAHE3/61 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 SMAJ22CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ22CAHE3/61?
All SMAJ22CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAHE3/61, 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 SMAJ22CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ22CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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