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Vishay General Semiconductor - Diodes Division SMAJ22-E3/61
- Part No.:
- SMAJ22-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22-E3/61.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,477
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Product details
Overview
SMAJ22-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping transient overvoltages on power and signal lines. It features a 22 V standoff 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 with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces against ESD and inductive switching surges.
For engineers reviewing the SMAJ22-E3/61 datasheet, SMAJ22-E3/61 pinout, SMAJ22-E3/61 application, or SMAJ22-E3/61 equivalent, this page delivers verified electrical parameters, thermal resistance data (RθJA = 120 °C/W), RoHS-compliant packaging details, junction temperature limits (−55 to +150 °C), and validated alternative parts for automotive, industrial, and telecom surge protection designs.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable VBR tolerance (±5 % for SMAJ22 variants) and low incremental surge resistance, enabling fast response (<1 ns) to transients induced by inductive load switching or lightning-induced surges.
It is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports automated placement, and meets MSL Level 1 per J-STD-020 with 260 °C solder reflow compatibility. Thermal performance is defined by RθJA = 120 °C/W (on 5.0 × 5.0 mm copper pads) and RθJL = 30 °C/W, confirming suitability for compact PCB layouts with moderate power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 29.8 V at IT = 1 mA - Ensures reliable avalanche initiation within tight tolerance; critical for predictable clamping threshold. |
| VC @ IPPM | 39.4 V at 10.2 A - Clamped voltage seen by protected circuit during 400 W transient; determines downstream component stress level. |
| PPPM | 400 W (10/1000 µs) - Peak surge energy handling capacity; derates to 300 W above 78 V, but SMAJ22 fully utilizes full rating. |
| IFSM | 40 A (8.3 ms half-sine) - Withstands high-current inrush without failure; supports robust protection in motor drive or relay circuits. |
| TJ range | −55 °C to +150 °C - Enables operation in under-hood automotive, industrial control, and outdoor telecom environments. |
| RθJA | 120 °C/W - Thermal resistance to ambient on standard 5.0 × 5.0 mm pads; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case meeting UL 94 V-0 flammability rating. Matte tin-plated leads, solderable per J-STD-002 and JESD22-B102. Cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-banded end is cathode) | Connected to lower-potential side of protected line; reverse-biased during clamping event. |
| Cathode | Avalanche breakdown terminal (marked with band) | Connected to higher-potential rail (e.g., VCC or signal line); conducts surge current to ground when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures stable VBR over temperature and lifetime; eliminates parameter drift due to moisture or contamination. |
| 400 W peak pulse power (10/1000 µs) | Provides high-energy transient suppression without degradation; exceeds IEC 61000-4-5 Level 4 requirements for industrial ports. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients; improves clamping precision for sensitive 3.3 V or 5 V logic interfaces. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free assembly without prebaking; reduces manufacturing complexity and cost. |
| RoHS-compliant, JESD201 Class 1A whisker tested | Meets global environmental regulations and long-term reliability standards for commercial-grade electronics. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in engine control units (ECUs) and body control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC/DC input to clamp spikes up to ±100 V. Use Value: Limits voltage to ≤39.4 V during 10.2 A surge, preventing damage to LDOs and microcontrollers rated for 40 V absolute maximum. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted across signal and return path near connector to shunt transients before reaching op-amp or ADC front-end. Use Value: Sub-1 ns response clamps 8 kV contact ESD per IEC 61000-4-2 to <40 V, preserving measurement accuracy and avoiding latch-up. |
| Telecom Data Line Surge Suppression | Consumer Equipment AC/DC Input Protection |
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on A/B differential lines referenced to local ground plane. Use Value: 400 W rating handles multi-kA induced currents; low VC prevents transceiver damage while maintaining signal integrity. |
Use Scenario: Adding secondary overvoltage protection on the DC output of wall adapters powering smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: TVS placed after primary fuse and filter capacitor to absorb residual transients escaping upstream protection. Use Value: 22 V VWM aligns with 24 V nominal outputs; 39.4 V VC stays below 42 V safety limit for Class II isolated supplies. |
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-E3/61 | Lower VBR range (24.4–26.9 V), tighter tolerance; 35.5 V VC at 11.3 A; same package and PPPM. | Better suited for precision 24 V systems requiring lower clamping voltage and reduced let-through energy. | Select SMAJ22A-E3/61 when VC margin is critical and system can tolerate slightly earlier clamping onset. |
| SMCJ22A-E3/61 | DO-214AB (SMC) package; 1500 W PPPM; 35.5 V VC at 42.1 A; higher IPPM and thermal mass. | Used where higher surge energy handling is required, e.g., mains-connected equipment or heavy industrial controls. | Choose SMCJ22A-E3/61 only if board space allows larger SMC footprint and 1500 W rating is mandatory - not a drop-in replacement. |
Compared with SMAJ22-E3/61, the SMAJ22A-E3/61 offers lower clamping voltage for tighter protection margins, while the SMCJ22A-E3/61 provides 3.75× higher surge power handling at the cost of larger size and different thermal profile - selection depends on energy level, layout constraints, and VC budget.
Availability
SMAJ22-E3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom data line surge suppression, and consumer DC adapter output safeguarding requiring stable component supply and full traceability.
Supply support for SMAJ22-E3/61 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability surface-mount transient suppression in space-constrained, high-volume applications - balancing clamping performance, thermal robustness, and manufacturability across automotive, industrial, and communications markets.
FAQ
What is the maximum clamping voltage of the SMAJ22-E3/61 under specified test conditions?
The SMAJ22-E3/61 has a maximum clamping voltage (VC) of 39.4 V when subjected to its rated peak pulse current (IPPM) of 10.2 A using the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C on recommended 5.0 × 5.0 mm copper pads and represents the highest voltage the protected circuit will experience during a 400 W transient event. The SMAJ22-E3/61 maintains this specification across its qualified operating temperature range.
Is the SMAJ22-E3/61 suitable for automotive applications?
Yes, the SMAJ22-E3/61 is rated for operation from −55 °C to +150 °C and complies with RoHS and JESD201 Class 1A whisker testing, making it suitable for commercial-grade automotive subsystems such as infotainment power rails and body electronics. However, for AEC-Q101 qualified applications, the HE3-suffix variant (e.g., SMAJ22HE3/61) must be used - the SMAJ22-E3/61 itself is not AEC-Q101 certified.
How does the SMAJ22-E3/61 differ from the SMAJ22A-E3/61?
The SMAJ22-E3/61 has a VBR range of 24.4–29.8 V and clamps at 39.4 V, whereas the SMAJ22A-E3/61 features a tighter VBR range of 24.4–26.9 V and lower clamping voltage of 35.5 V at 11.3 A. Both share identical package (DO-214AC), PPPM (400 W), and thermal specs. The "A" suffix denotes enhanced VBR uniformity and reduced VC, making SMAJ22A-E3/61 preferable where precise clamping onset and lower let-through voltage are critical.
What is the thermal resistance of the SMAJ22-E3/61, and how does it affect layout design?
The SMAJ22-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and directly impacts safe surge repetition rate: higher ambient temperatures or smaller pads increase junction temperature rise. To maintain reliability under repetitive surges, designers should adhere to the recommended pad layout and consider additional copper area or thermal vias if operating near TJ max (150 °C).
Can the SMAJ22-E3/61 be used in bidirectional configurations?
No - the SMAJ22-E3/61 is a unidirectional TVS diode, identified by its cathode band marking. For bidirectional transient suppression (e.g., AC lines or symmetric signal pairs), the CA-suffix variant SMAJ22CA-E3/61 must be selected. That part exhibits symmetrical clamping in both polarities with VWM = 22 V and VC = 39.4 V in either direction. Using SMAJ22-E3/61 in reverse-biased AC applications risks permanent failure due to forward conduction during negative half-cycles.
SMAJ22-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22-E3/61 FAQ
1.How can I place an order for SMAJ22-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22-E3/61 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 SMAJ22-E3/61 reliable?
The price and inventory of SMAJ22-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ22-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22-E3/61?
SMAJ22-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22-E3/61 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 SMAJ22-E3/61?
For technical support, including SMAJ22-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22-E3/61 requirements.
6.How does Aetrix verify that SMAJ22-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ22-E3/61 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 SMAJ22-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ22-E3/61?
All SMAJ22-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22-E3/61, 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 SMAJ22-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ22-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22-E3/61 Tags
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