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Vishay General Semiconductor - Diodes Division SMAJ22CAHE3_A/I
- Part No.:
- SMAJ22CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAHE3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,587
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Product details
Overview
SMAJ22CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed in automotive sensor interface protection.
For engineers reviewing the SMAJ22CAHE3_A/I datasheet, SMAJ22CAHE3_A/I pinout, SMAJ22CAHE3_A/I application, or SMAJ22CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package supports high thermal dissipation via low RθJL (30 °C/W).
The device complies with ANSI/IEEE C62.35 for surge protection and meets MSL level 1 per J-STD-020 with 260 °C reflow peak. It is rated for repetitive 0.01% duty cycle surges up to 400 W below 78 V and derates to 300 W above that threshold, with clamping performance validated under standardized 10/1000 μs waveform conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal line bias margin. |
| VBR min/max | 24.4 V / 26.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capacity; sufficient for ISO 7637-2 Pulse 1/2a/3a in automotive systems. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.0 mm × 5.0 mm thermal pad footprint; optimized for automated assembly and thermal relief. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are functionally symmetrical; device has two terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output for transient suppression; no polarity dependency in circuit layout. |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal completing the symmetrical clamping path; enables placement across any differential or single-ended line. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 400 W peak pulse power | Supports robust immunity to ISO 16750-2 load dump spikes and IEC 61000-4-5 surge events in 12 V automotive systems. |
| AEC-Q101 qualification | Validates long-term reliability under automotive thermal, mechanical, and electrical stress profiles. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs or MCUs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying manufacturing logistics. |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and MCU ADC input to limit transient excursions beyond absolute maximum ratings. Use Value: Prevents ADC saturation and input stage damage during 100 V/50 ms load dump events while maintaining signal integrity below 22 V nominal operation. |
Use Scenario: Safeguarding CANH/CANL differential pair against ESD and coupled transients in factory automation PLCs and motor drives. IC Role / Device Role / Timing Role: TVS pair (one per line) shunting surge energy before it reaches isolated CAN transceiver inputs. Use Value: Maintains CAN bus communication integrity during 8 kV contact ESD (IEC 61000-4-2) and 1 kV surge (IEC 61000-4-5) without signal distortion or reset. |
| Consumer USB Port Protection | Telecom Power Supply Input |
|
Use Scenario: Shielding USB 2.0 D+/D− lines in portable docking stations from human-body-model ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at connector to divert sub-1 ns ESD pulses away from USB PHY. Use Value: Limits clamping voltage to ≤35.5 V during 15 kV air discharge, preventing PHY latch-up while adding <0.5 pF parasitic capacitance. |
Use Scenario: Front-end transient suppression on 24 V DC input rails of VoIP gateways and base station power supplies. IC Role / Device Role / Timing Role: Primary clamping device across input terminals to absorb lightning-induced surges before bulk capacitors and regulators. Use Value: Withstands 400 W 10/1000 μs surges without degradation, extending system MTBF in outdoor telecom enclosures. |
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-M3/5A | Halogen-free, RoHS-compliant, same electrical specs and AEC-Q101 qualification; differs only in material composition and packaging tape size (13″ reel). | No functional difference; suitable where halogen-free compliance is mandated by OEM environmental policy. | Select SMAJ22CA-M3/5A when halogen-free materials are required; otherwise SMAJ22CAHE3_A/I offers identical protection with standard RoHS compliance. |
| SMBJ22CAHE3_A/I | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher 600 W PPPM rating and lower RθJA (90 °C/W vs. 120 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint and may not fit space-constrained layouts. | Choose SMBJ22CAHE3_A/I only if higher surge endurance (>400 W) or improved thermal management is needed; SMAJ22CAHE3_A/I remains optimal for cost- and space-sensitive designs. |
Compared with SMAJ22CA-M3/5A, SMAJ22CAHE3_A/I provides identical protection performance with standard RoHS compliance, while SMBJ22CAHE3_A/I trades compactness for higher power handling-making SMAJ22CAHE3_A/I the balanced choice for automotive and industrial SMT applications requiring AEC-Q101 validation and minimal board area.
Availability
SMAJ22CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB ports, and telecom power supply inputs requiring stable component supply across production lifecycles.
Supply support for SMAJ22CAHE3_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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-particularly targeting automotive, industrial, and telecom applications where AEC-Q101 qualification and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMAJ22CAHE3_A/I at its rated peak pulse current?
The SMAJ22CAHE3_A/I exhibits a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current (IPPM) of 11.3 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024 (Document Number: 88390). The low VC ensures protected circuits remain within safe operating limits during surge events, making SMAJ22CAHE3_A/I especially effective for safeguarding 3.3 V or 5 V logic interfaces downstream of the clamp.
Is SMAJ22CAHE3_A/I suitable for automotive applications?
Yes, SMAJ22CAHE3_A/I is AEC-Q101 qualified, explicitly listed in Vishay's ordering information with the "HE3" suffix denoting RoHS-compliant and AEC-Q101 qualified variants. It meets automotive requirements for temperature cycling, high-temperature reverse bias, and ESD robustness. Its 150 °C maximum junction temperature, bidirectional clamping, and 400 W surge rating align with ISO 7637-2 and ISO 16750-2 test profiles-making SMAJ22CAHE3_A/I appropriate for engine control units, ADAS sensors, and body electronics modules.
What does the "CA" suffix indicate in SMAJ22CAHE3_A/I?
The "CA" suffix in SMAJ22CAHE3_A/I designates a bidirectional configuration, meaning the device functions identically in both polarities-clamping positive and negative transients without requiring orientation during PCB placement. This contrasts with unidirectional "A" variants (e.g., SMAJ22A), which have a defined cathode band and conduct only in reverse bias. The CA version is ideal for protecting AC-coupled lines, differential buses like CAN or RS-485, or any signal path where voltage polarity reversal is possible.
What is the thermal resistance of SMAJ22CAHE3_A/I, and how does it affect PCB layout?
SMAJ22CAHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient resistance (RθJA) of 120 °C/W when mounted on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area-minimum 5.0 mm × 5.0 mm per pad-and avoid excessive trace length between the device and ground/power planes. The SMA package's low RθJL enables efficient heat transfer to leads, supporting reliable operation even at elevated ambient temperatures.
How does SMAJ22CAHE3_A/I compare to SMAJ22A in terms of circuit implementation?
SMAJ22CAHE3_A/I is bidirectional and polarity-agnostic, allowing placement across any two points without regard to anode/cathode orientation-ideal for differential or floating lines. In contrast, SMAJ22A is unidirectional and requires correct polarity alignment (cathode band toward the more positive node) to function. SMAJ22CAHE3_A/I also features symmetric VBR and VC in both directions, whereas SMAJ22A conducts forward current (VF = 3.5 V at 25 A) in one direction only. For most modern signal-line protection, SMAJ22CAHE3_A/I simplifies layout and eliminates orientation errors.
SMAJ22CAHE3_A/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:
- 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):
- 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_A/I FAQ
1.How can I place an order for SMAJ22CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAHE3_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 SMAJ22CAHE3_A/I reliable?
The price and inventory of SMAJ22CAHE3_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 SMAJ22CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ22CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAHE3_A/I?
SMAJ22CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAHE3_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 SMAJ22CAHE3_A/I?
For technical support, including SMAJ22CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ22CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAHE3_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 SMAJ22CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ22CAHE3_A/I?
All SMAJ22CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAHE3_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 SMAJ22CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ22CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22CAHE3_A/I Tags
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