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Vishay General Semiconductor - Diodes Division SMAJ22AHE3/5A
- Part No.:
- SMAJ22AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHE3/5A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,308
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Product details
Overview
SMAJ22AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode 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, 35.5 V clamping voltage (VC) at 11.3 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), making it suitable for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMAJ22AHE3/5A datasheet, SMAJ22AHE3/5A pinout, SMAJ22AHE3/5A application, or SMAJ22AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) surface-mount package, unidirectional polarity with cathode band marking, and compliance with UL 497B for surge protector classification.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, responding to transients within <1 ps by entering avalanche conduction when reverse voltage exceeds VBR. Its low incremental surge resistance (typical Rdyn ≈ 1.2 Ω derived from ΔVC/ΔIPPM) ensures minimal voltage overshoot during ESD or lightning-induced surges.
Designed for high-reliability environments, SMAJ22AHE3/5A meets MSL Level 1 per J-STD-020, supports lead-free reflow up to 260 °C peak, and delivers stable performance across –55 °C to +150 °C junction temperature range. Its glass-passivated junction and matte tin-plated leads ensure long-term solderability and corrosion resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 24.4 V / 26.9 V at IT = 1 mA - Confirmed breakdown threshold ensuring predictable turn-on under transient stress. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 400 W 10/1000 μs surge; limits downstream component stress. |
| IPPM | 11.3 A - Peak pulse current capability under standardized waveform; validates surge handling capacity. |
| PPPM | 400 W - Peak pulse power rating (10/1000 μs); certifies protection level against common inductive switching transients. |
| Junction Temp Range | –55 °C to +150 °C - Enables deployment in under-hood automotive and industrial control environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height for automated assembly. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to system ground or low-impedance return node; completes clamping loop during transient events. |
| Cathode | Reverse voltage sensing / Avalanche conduction terminal | Marked with band; connected to protected line (e.g., 24 V rail or sensor input); initiates clamping when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| 400 W peak pulse power (10/1000 μs) | Withstands repetitive inductive load switching surges in motor drivers and power supply outputs without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to downstream ICs-critical for 3.3 V or 5 V logic interfacing with 24 V systems. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free SMT assembly without moisture-related popcorning or delamination risks. |
| UL 497B recognized (QVGQ2) | Meets Underwriters Laboratories requirements for telecom and industrial surge protection modules. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in body control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤35.5 V during 12 V/24 V load dump events, preventing damage to LDOs and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted at connector interface, shunting fast transients before reaching op-amp input stage. Use Value: Sub-nanosecond response clamps 8 kV HBM ESD pulses to safe levels, preserving ADC accuracy and sensor calibration. |
| Consumer Power Adapter Output Protection | Telecom Interface Surge Suppression |
Use Scenario: Safeguarding USB-C PD port VBUS lines against overvoltage from faulty adapters or hot-plug transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on VBUS rail upstream of buck controller and load switch. Use Value: Absorbs 400 W surges without latch-up, maintaining compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) requirements. |
Use Scenario: Front-end protection for RS-485 transceivers exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional-capable variant used (SMAJ22CA), but SMAJ22AHE3/5A serves as unidirectional alternative in grounded-line configurations. Use Value: Provides 35.5 V clamping on data line-to-ground, enabling robust operation in industrial Ethernet and fieldbus networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5A | Commercial-grade version without AEC-Q101 qualification; identical electrical specs and SMA package. | Approved for non-automotive industrial and consumer use only; not validated for automotive temperature cycling or lifetime reliability tests. | Select when cost sensitivity outweighs automotive qualification requirements and full lifecycle traceability is not mandated. |
| SMBJ22AHE3/5A | Same VWM, VBR, and VC, but in SMB (DO-214AA) package with higher PPPM = 600 W and lower RθJA = 80 °C/W. | Better thermal performance and surge margin; requires larger PCB footprint (4.57 mm × 3.94 mm vs. 5.28 mm × 4.50 mm). | Choose when system-level surge testing exceeds 400 W or board layout allows SMB footprint and improved heat dissipation is needed. |
Compared with SMAJ22A-E3/5A, SMAJ22AHE3/5A adds AEC-Q101 qualification for automotive use without altering electrical behavior; versus SMBJ22AHE3/5A, it trades 200 W pulse power headroom and thermal advantage for smaller SMA footprint and lower profile-ideal where space is constrained but 400 W protection suffices.
Availability
SMAJ22AHE3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, and telecom interface protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ22AHE3/5A 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, and protection devices with emphasis on reliability and application-specific validation.
The SMAJ series was engineered for high-volume, high-reliability transient suppression in harsh environments-particularly targeting automotive power distribution, industrial automation, and infrastructure equipment where consistent clamping and long-term stability are critical.
FAQ
What is the clamping voltage of SMAJ22AHE3/5A at its rated peak pulse current?
The SMAJ22AHE3/5A has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that protected circuitry will not experience more than 35.5 V during a 400 W transient event. The SMAJ22AHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ22AHE3/5A suitable for automotive applications?
Yes, SMAJ22AHE3/5A is AEC-Q101 qualified and specifically designated for automotive use, as confirmed by its "HE3" suffix and Vishay's documentation. It undergoes rigorous stress testing-including temperature cycling, high-temperature operating life, and mechanical shock-to ensure reliability in engine control units, body electronics, and ADAS power domains. The SMAJ22AHE3/5A meets all requirements for under-hood and cabin-mounted modules.
What does the "HE3" suffix indicate in SMAJ22AHE3/5A?
The "HE3" suffix in SMAJ22AHE3/5A denotes RoHS-compliant construction with AEC-Q101 qualification and halogen-free molding compound. It distinguishes this grade from commercial-only variants (e.g., "E3") and confirms compliance with automotive reliability standards, UL 497B recognition, and JESD201 Class 2 whisker resistance. The "5A" denotes 7500-unit tape-and-reel packaging on 13-inch reels.
How does SMAJ22AHE3/5A differ from bidirectional TVS diodes like SMAJ22CA?
SMAJ22AHE3/5A is unidirectional and features a cathode band for polarity-sensitive placement, while SMAJ22CA is bidirectional with no polarity marking and symmetrical clamping in both directions. The SMAJ22AHE3/5A is intended for DC rail protection where reverse voltage is blocked by design, whereas SMAJ22CA suits AC-coupled or floating signal lines. Their VBR, VC, and PPPM values are otherwise matched.
What is the thermal resistance of SMAJ22AHE3/5A, and how does it affect PCB layout?
SMAJ22AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet; increasing copper area reduces RθJA and improves sustained surge handling. For high-duty-cycle applications, designers should verify junction temperature rise using PD = 3.3 W and ambient conditions-especially in sealed enclosures where airflow is limited.
SMAJ22AHE3/5A 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ22AHE3/5A FAQ
1.How can I place an order for SMAJ22AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHE3/5A 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 SMAJ22AHE3/5A reliable?
The price and inventory of SMAJ22AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHE3/5A?
SMAJ22AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHE3/5A 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 SMAJ22AHE3/5A?
For technical support, including SMAJ22AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHE3/5A requirements.
6.How does Aetrix verify that SMAJ22AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHE3/5A 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 SMAJ22AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22AHE3/5A?
All SMAJ22AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHE3/5A, 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 SMAJ22AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ22AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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