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Vishay General Semiconductor - Diodes Division SMAJ22A-E3/5A
- Part No.:
- SMAJ22A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22A-E3/5A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,312
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Product details
Overview
SMAJ22A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal 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). It protects MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ22A-E3/5A datasheet, SMAJ22A-E3/5A pinout, SMAJ22A-E3/5A application, or SMAJ22A-E3/5A equivalent, key selection criteria include clamping voltage margin vs. protected device VDS(max), thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a shunt-type overvoltage protector: under normal conditions it presents high impedance (>1 MΩ leakage at 22 V), then rapidly avalanches below its breakdown threshold to clamp transient energy into ground. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance.
Designed for 10/1000 μs surge waveforms per IEC 61000-4-5, it delivers 400 W peak pulse power up to 78 V and derates to 300 W above that. The SMA package supports automated placement and meets MSL level 1 (260 °C reflow peak), with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 22 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for normal circuit operation. |
| VBR (Breakdown Voltage) | 24.4–26.9 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering before protected IC's absolute maximum rating. |
| VC (Clamping Voltage) | 35.5 V at IPPM = 11.3 A - Peak voltage seen by downstream circuit during 10/1000 μs transient; must be below protected device's VDS(max) or VIO(max). |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capacity for single transients; defines protection robustness against inductive switching or ESD-like surges. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; determines safe power derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables operation in under-hood automotive or enclosed industrial environments. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction, conducts only during negative transients on anode side. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with molded compound meeting UL 94 V-0. Cathode identified by black band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient current entry point (reverse bias) | Connected to line being protected; avalanche conduction occurs when voltage exceeds VBR relative to cathode. |
| Cathode (banded end) | Transient current return path | Connected to system ground or low-impedance reference; establishes unidirectional clamping direction and polarity-sensitive layout. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3 (1 kV/2 kV) surges without derating in typical PCB layouts. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream components-critical for 24 V automotive MCUs with 36 V absolute max ratings. |
| MSL Level 1 moisture sensitivity | Allows direct placement onto reflow soldering lines without baking; reduces manufacturing overhead and handling risk. |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, with <0.1 %/°C drift-essential for long-term reliability in industrial controls. |
| AEC-Q101 qualification option | HE3 suffix variants are qualified for automotive applications, supporting functional safety requirements in ADAS and body electronics. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 24 V battery-supplied control modules exposed to load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Shunt clamping element placed between power rail and chassis ground to limit transients to ≤36 V. Use Value: Prevents latch-up or gate oxide damage in MCU power inputs and CAN transceivers during 120 V/400 ms load dump events. |
Use Scenario: Analog output lines (4–20 mA, 0–10 V) from pressure/temperature sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Reverse-biased TVS across signal and return paths to suppress EFT bursts (IEC 61000-4-4) and cable-coupled noise. Use Value: Maintains signal integrity below ±0.5 % full-scale error by limiting transient-induced offset shifts during 2 kV contact discharge. |
| DC-DC Converter Input Protection | MOSFET Gate Driver Line Protection |
|
Use Scenario: 48 V input stage of isolated buck-boost converters in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitors and controller ICs. Use Value: Absorbs 400 W surge energy without degradation, preserving converter startup sequencing and preventing controller brownout resets. |
Use Scenario: High-side N-channel MOSFET gate drive traces routed near noisy motor windings in BLDC inverters. IC Role / Device Role / Timing Role: Localized clamping between gate and source to prevent dv/dt-induced false turn-on and gate oxide puncture. Use Value: Limits gate-source voltage to <35.5 V during 100 ns rise-time transients, ensuring reliable FET switching and avoiding shoot-through failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No difference in protection performance; selected where halogen-free BOM compliance is mandated (e.g., EU industrial equipment). | Direct substitution if halogen-free certification is required; same thermal and clamping behavior. |
| SMAJ24A-E3/5A | Higher VWM (24 V), VBR (26.7–29.5 V), and VC (38.9 V); otherwise identical package and power rating. | Better suited for 24 V nominal systems with wider supply tolerance (e.g., 24 ±10 %), where tighter clamping margin is less critical than higher stand-off headroom. | Choose when protecting circuits with >38 V absolute maximum ratings and need reduced leakage at 22–23 V operating points. |
Compared with SMAJ22A-E3/5A, SMAJ22A-M3/5A offers identical protection with halogen-free construction, while SMAJ24A-E3/5A trades 2 V higher stand-off for 3.4 V higher clamping-enabling use in wider-tolerance 24 V rails but requiring verification of downstream voltage margins.
Availability
SMAJ22A-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, DC-DC converter input staging, and MOSFET gate driver line safeguarding requiring stable component supply and traceable sourcing.
Supply support for SMAJ22A-E3/5A 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q qualification.
The SMAJ series targets board-level transient suppression in harsh environments-designed for fast response, repeatable clamping, and compatibility with automated SMT assembly across automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of the SMAJ22A-E3/5A under a 10/1000 μs surge?
The SMAJ22A-E3/5A has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88390) and defines the upper voltage limit imposed on protected circuitry during standardized surge events. Engineers must verify this clamping level remains below the absolute maximum voltage rating of downstream components.
Is the SMAJ22A-E3/5A suitable for automotive applications?
The SMAJ22A-E3/5A itself is commercial-grade; however, the AEC-Q101 qualified version is designated SMAJ22AHE3_X (e.g., SMAJ22AHE3_A). While SMAJ22A-E3/5A shares identical electrical and thermal characteristics, only the HE3-suffixed variants undergo automotive stress testing per AEC-Q101. For non-safety-critical 24 V subsystems, SMAJ22A-E3/5A may be used pending internal qualification-but design-in for automotive production requires the HE3 variant.
How does the SMAJ22A-E3/5A differ from bidirectional TVS diodes like SMAJ22CA?
The SMAJ22A-E3/5A is unidirectional and features a cathode band for polarity-sensitive placement, conducting only during reverse-bias transients. In contrast, SMAJ22CA is bidirectional with no polarity marking and clamps symmetrically in both directions. SMAJ22A-E3/5A offers lower leakage (<1 μA at 22 V) and is preferred for DC power rails; SMAJ22CA suits AC-coupled or floating signal lines where polarity is undefined.
What is the thermal resistance and how does it affect layout for SMAJ22A-E3/5A?
The SMAJ22A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA and improves surge survivability. Layouts must maintain ≥0.074" (1.88 mm) clearance from adjacent components to avoid localized heating during repetitive surges.
Can SMAJ22A-E3/5A replace SMAJ20A or SMAJ24A in existing designs?
SMAJ22A-E3/5A is not a direct drop-in replacement for SMAJ20A or SMAJ24A due to differences in VWM (22 V vs. 20 V or 24 V) and clamping voltage (35.5 V vs. 32.4 V or 38.9 V). Substitution requires verifying that the new VWM provides adequate margin above operating voltage and that the new VC stays within protected device limits. No PCB changes are needed for package compatibility, but system-level transient testing is mandatory after any change.
SMAJ22A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22A-E3/5A FAQ
1.How can I place an order for SMAJ22A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22A-E3/5A 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 SMAJ22A-E3/5A reliable?
The price and inventory of SMAJ22A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22A-E3/5A?
SMAJ22A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22A-E3/5A 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 SMAJ22A-E3/5A?
For technical support, including SMAJ22A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22A-E3/5A requirements.
6.How does Aetrix verify that SMAJ22A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22A-E3/5A 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 SMAJ22A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22A-E3/5A?
All SMAJ22A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22A-E3/5A, 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 SMAJ22A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ22A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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