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Vishay General Semiconductor - Diodes Division SMAJ22HE3/5A
- Part No.:
- SMAJ22HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22HE3/5A.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,084
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Product details
Overview
SMAJ22HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features a 22 V stand-off voltage (VWM), 24.4–29.8 V breakdown voltage (VBR at 1 mA), 39.4 V maximum clamping voltage (VC) at 10.2 A peak pulse current, and 400 W peak pulse power rating (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD.
For engineers reviewing the SMAJ22HE3/5A datasheet, SMAJ22HE3/5A pinout, SMAJ22HE3/5A application, or SMAJ22HE3/5A equivalent, this page delivers verified electrical parameters, automotive-grade qualification status, thermal resistance values (RθJA = 120 °C/W), junction temperature range (–55 to +150 °C), and RoHS-compliant high-reliability construction per JESD201 Class 2 whisker test.
Technical Context
The SMAJ22HE3/5A employs a glass-passivated silicon avalanche junction optimized for fast response (<1 ps) to transient events and low incremental surge resistance. Its unidirectional polarity uses a cathode band marking and supports DC-biased protection paths with forward voltage drop of 3.5 V at 25 A (per datasheet note 6).
Rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), it operates across –55 °C to +150 °C junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C solder dip tolerance. Thermal design requires 0.2 × 0.2" copper pads per terminal to sustain full 400 W pulse rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level DC bias margin. |
| VBR (min/max) | 24.4 V / 29.8 V at 1 mA - Confirmed breakdown window ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 39.4 V at 10.2 A - Clamping voltage defines worst-case protected-circuit stress during 10/1000 µs surge. |
| PPPM | 400 W - Peak pulse power handling capability on standard 5.0 × 5.0 mm copper pads; derates above 25 °C ambient. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); validates robustness against motor-switching events. |
| TJ Range | –55 °C to +150 °C - Full automotive-grade operating and storage temperature envelope per AEC-Q101. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance under specified PCB layout; critical for thermal margin calculation. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD22-B102. Cathode identified by single band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point in unidirectional operation | Connected to protected line side when used in DC-biased clamping configuration. |
| Cathode | Reverse-biased clamping node; marked with band | Connected to ground or low-impedance return path to shunt transient energy safely. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and chassis applications requiring zero defect reliability and extended temperature cycling. |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 µA at VWM) over lifetime and humidity exposure. |
| MSL Level 1 rating | Enables direct placement without baking; compatible with standard reflow profiles up to 260 °C peak. |
| 400 W pulse power (10/1000 µs) | Provides sufficient energy absorption for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| JESD201 Class 2 whisker resistance | Guarantees long-term interconnect integrity in high-vibration environments like engine control modules. |
Applications
| Automotive Powertrain ECUs | Industrial Motor Drive Inputs |
|---|---|
|
Use Scenario: Protecting microcontroller I/O and gate driver inputs from load dump and inductive kickback in 12 V/24 V engine control units. IC Role / Device Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients below IC absolute maximum ratings. Use Value: With VC = 39.4 V and 400 W rating, SMAJ22HE3/5A limits stress on 3.3 V/5 V logic interfaces while surviving repeated 100 V/500 ms load dump events. |
Use Scenario: Safeguarding analog sensor inputs (e.g., current shunt monitors, position sensors) in variable-frequency drives exposed to switching noise. IC Role / Device Role: Low-capacitance (<50 pF typical at 1 MHz) clamping device on differential signal pairs upstream of ADC front-ends. Use Value: 22 V VWM allows clean operation across ±15 V analog rails; 10.2 A IPPM handles repetitive 1 kV EFT bursts per IEC 61000-4-4. |
| Telecom Base Station Power Rails | Consumer Appliance Control Boards |
|
Use Scenario: Secondary overvoltage protection on +48 V DC distribution lines feeding RF power amplifiers and backhaul interfaces. IC Role / Device Role: Standoff-rated TVS deployed after primary MOV or fuse to provide precise clamping and prevent follow-on conduction. Use Value: Tight VBR window (24.4–29.8 V) enables coordination with upstream protectors; 150 °C TJmax supports enclosed outdoor cabinet operation. |
Use Scenario: ESD and surge suppression on user interface buttons, display backlight controls, and relay coil drivers in washing machines and HVAC systems. IC Role / Device Role: Cost-effective, high-reliability discrete protector replacing older SMAJ22A-E3 where automotive-grade longevity is required. Use Value: HE3 suffix guarantees JESD201 Class 2 whisker resistance and AEC-Q101 qualification-critical for 10+ year appliance field life with no latent failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3/5A | Lower VBR range (24.4–26.9 V), tighter tolerance; same VWM, VC = 35.5 V at 11.3 A | Better suited for lower-clamp designs where protected ICs have tighter VMAX margins | Select SMAJ22AHE3/5A when clamping voltage headroom is constrained below 39.4 V. |
| SMBJ22HE3/5A | Same VWM/VBR specs but SMB package (DO-214AA); 600 W PPPM, RθJA = 80 °C/W | Higher power handling and improved thermal performance, but larger footprint | Choose SMBJ22HE3/5A when surge energy exceeds 400 W or board space permits larger package. |
Compared with SMAJ22HE3/5A, SMAJ22AHE3/5A offers lower clamping for tighter voltage margins, while SMBJ22HE3/5A provides higher surge capacity and better thermal dissipation-both retain AEC-Q101 qualification and HE3 reliability grading but differ in package size and clamping performance.
Availability
SMAJ22HE3/5A is available at Aetrix Electronics and suitable for automotive powertrain ECUs, industrial motor drive inputs, and telecom base station power rails requiring stable component supply, long-lifecycle assurance, and AEC-Q101-compliant reliability.
Supply support for SMAJ22HE3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and long-term stability are mandatory.
FAQ
What is the peak pulse power rating of the SMAJ22HE3/5A?
The SMAJ22HE3/5A has a peak pulse power rating (PPPM) of 400 W for a 10/1000 µs waveform when mounted on 0.2 × 0.2" copper pads. This rating applies up to 25 °C ambient and derates linearly above that temperature per Figure 2 in Vishay document 88390. The SMAJ22HE3/5A maintains this rating under AEC-Q101 stress conditions.
Is the SMAJ22HE3/5A suitable for automotive applications?
Yes, the SMAJ22HE3/5A is AEC-Q101 qualified and designated as high-reliability/automotive grade (HE3 suffix). It meets JESD201 Class 2 whisker resistance, MSL Level 1, and operates across –55 °C to +150 °C junction temperature-making it fully compliant for under-hood and chassis-mounted automotive electronics. The SMAJ22HE3/5A is explicitly validated for such use cases in Vishay's documentation.
What is the clamping voltage of the SMAJ22HE3/5A at its rated peak pulse current?
The SMAJ22HE3/5A has a maximum clamping voltage (VC) of 39.4 V at 10.2 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ22HE3/5A achieves this clamping performance while maintaining low incremental surge resistance.
How does the HE3 suffix differ from the E3 suffix on SMAJ22 devices?
The HE3 suffix on SMAJ22HE3/5A denotes high-reliability/automotive grade compliance, including AEC-Q101 qualification and JESD201 Class 2 whisker resistance testing. In contrast, the E3 suffix indicates commercial-grade RoHS compliance only (JESD201 Class 1A). The SMAJ22HE3/5A is built to stricter process controls, screening, and lifetime validation than E3 variants.
What is the thermal resistance of the SMAJ22HE3/5A?
The SMAJ22HE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended pad layout (0.2 × 0.2" copper pads per terminal). Its junction-to-lead resistance (RθJL) is 30 °C/W. These values are essential for calculating safe operating area under repetitive surge conditions. The SMAJ22HE3/5A thermal characteristics are confirmed in Vishay document 88390, page 4.
SMAJ22HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 10.2A
- 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)
SMAJ22HE3/5A FAQ
1.How can I place an order for SMAJ22HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22HE3/5A 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 SMAJ22HE3/5A reliable?
The price and inventory of SMAJ22HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22HE3/5A?
SMAJ22HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22HE3/5A 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 SMAJ22HE3/5A?
For technical support, including SMAJ22HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22HE3/5A requirements.
6.How does Aetrix verify that SMAJ22HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22HE3/5A 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 SMAJ22HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22HE3/5A?
All SMAJ22HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22HE3/5A, 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 SMAJ22HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ22HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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