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Vishay General Semiconductor - Diodes Division SMAJ22-E3/5A
- Part No.:
- SMAJ22-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22-E3/5A.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,518
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Product details
Overview
SMAJ22-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 with 10/1000 µs waveform.
For engineers reviewing the SMAJ22-E3/5A datasheet, SMAJ22-E3/5A pinout, SMAJ22-E3/5A application, or SMAJ22-E3/5A equivalent, this device serves as a robust, RoHS-compliant transient protection solution for DC power rails, I/O lines, and sensor interfaces in industrial control, automotive subsystems, and telecom infrastructure where fast response (<1 ns), low clamping ratio, and high surge current capability are critical.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents <1 µA leakage at 22 V, but triggers into avalanche conduction when transient voltage exceeds its 24.4 V minimum breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
The device is rated for 150 °C maximum junction temperature, exhibits 120 °C/W typical thermal resistance (junction-to-ambient), and is qualified per J-STD-020 MSL Level 1 - enabling standard reflow assembly without moisture sensitivity concerns. Its 0.064 g unit weight and 13" tape-and-reel packaging (5A code) support high-volume automated placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail protection window. |
| VBR (min/max) | 24.4 V / 29.8 V at 1 mA - Ensures reliable triggering above nominal system voltage while accommodating process variation. |
| VC @ IPPM | 39.4 V at 10.2 A - Clamps transient energy to a safe level for downstream 3.3 V or 5 V ICs during 10/1000 µs surge events. |
| PPPM | 400 W - Sustains 10/1000 µs transient pulses without degradation; derates to 300 W above 78 V, but SMAJ22-E3/5A remains at full rating. |
| IFSM | 40 A - Withstands 8.3 ms half-sine surge on power rails, supporting motor driver and relay coil suppression. |
| Junction Temp Range | −55 °C to +150 °C - Enables deployment in under-hood automotive, industrial PLC, and outdoor telecom environments. |
| Package | DO-214AC (SMA) - Standardized surface-mount footprint compatible with IPC-7351B land patterns; cathode band marked. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, 0.208" × 0.157" body, cathode band marking on one end. Compliant with UL 94 V-0 flammability rating and J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes shunt path during overvoltage event. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V supply rail); avalanche conduction initiates here when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 5a) without failure on 24 V systems. |
| 10.2 A IPPM @ 10/1000 µs | Provides measurable margin over common automotive load-dump test currents (e.g., 10 A). |
| 39.4 V clamping voltage | Limits voltage seen by downstream 30 V-rated MOSFETs or 28 V input LDOs during surge events. |
| MSL Level 1 rating | Eliminates bake-out requirement prior to reflow; supports direct placement into high-throughput SMT lines. |
| RoHS-compliant E3 suffix | Meets EU Directive 2002/95/EC; matte tin plating ensures solder joint integrity and whisker resistance (JESD 201 Class 1A). |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Protection of 24 V DC power inputs to PLC I/O modules subjected to relay coil flyback and contact arcing. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across input terminals, clamping spikes within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in upstream DC-DC controllers and microcontrollers by limiting voltage to ≤39.4 V during 400 W surges. |
Use Scenario: Surge protection on LIN bus power lines and door module sensor supply rails exposed to battery dump and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBAT and ground, absorbing ISO 16750-2 load-dump energy. Use Value: Maintains system uptime by preventing reset or brownout in microcontrollers due to 12 V/24 V rail overshoot exceeding 30 V. |
| Telecom Power Feeds | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for PoE-powered remote radio units experiencing lightning-induced surges on 48 V DC feeds. IC Role / Device Role / Timing Role: Primary clamping device on DC input, coordinated with upstream GDT or MOV for multi-stage protection. Use Value: Limits let-through voltage to <40 V, safeguarding 50 V-rated DC-DC converters and Ethernet PHYs without adding series impedance. |
Use Scenario: Overvoltage protection on AC-DC adapter outputs feeding MCU and display logic in smart home hubs. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 5 V/3.3 V rails, suppressing ESD and switching noise from relays or solenoids. Use Value: Reduces field return rates by eliminating latent damage to USB transceivers and touch controller ICs during user interface actuation. |
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 | Lower VBR range (24.4–26.9 V) and tighter 5% VWM tolerance vs. 10% for SMAJ22-E3/5A; same VC (35.5 V) and PPPM. | Better suited for precision 22 V rail protection where minimal clamping overhead is required. | Select SMAJ22A-E3/5A when system VWM margin is tight and lower VBR variation improves design safety factor. |
| SMBJ22A-E3/52 | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating and higher IPPM (17.3 A). | Preferred for higher-energy environments (e.g., heavy-duty industrial drives) requiring extended surge endurance. | Choose SMBJ22A-E3/52 only if PCB layout allows larger footprint and system-level testing demands >400 W surge handling. |
Compared with SMAJ22A-E3/5A, the SMAJ22-E3/5A offers wider VBR tolerance for cost-sensitive designs where exact clamping threshold is less critical; versus SMBJ22A-E3/52, it provides identical protection performance in a space-constrained DO-214AC footprint ideal for dense consumer and telecom PCBs.
Availability
SMAJ22-E3/5A is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power feed applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for SMAJ22-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 power management, sensing, and protection devices with emphasis on reliability, efficiency, and manufacturability.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, low-inductance transient suppression in harsh electromagnetic environments across automotive, industrial, and communications systems.
FAQ
What is the maximum clamping voltage of the SMAJ22-E3/5A under a 10/1000 µs surge?
The SMAJ22-E3/5A has a maximum clamping voltage (VC) of 39.4 V at 10.2 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 in Vishay document 88390 and represents the upper limit of voltage imposed on protected circuitry during standardized surge events. The SMAJ22-E3/5A maintains this clamping performance across its full operating temperature range.
Is the SMAJ22-E3/5A unidirectional or bidirectional, and how is polarity identified?
The SMAJ22-E3/5A is a unidirectional TVS diode, meaning it conducts only in reverse-bias avalanche mode and blocks forward current like a standard rectifier. Polarity is indicated by a cathode band on the DO-214AC (SMA) package - the banded end connects to the higher-potential side (e.g., 24 V rail), while the unbanded end connects to ground. Bidirectional variants use "CA" suffixes (e.g., SMAJ22CA), which SMAJ22-E3/5A does not have.
Does the SMAJ22-E3/5A meet automotive qualification standards?
The SMAJ22-E3/5A is RoHS-compliant and rated for industrial-grade operation (−55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification, Vishay offers the HE3-suffix variant (e.g., SMAJ22HE3/5A), which carries AEC-Q101 certification and enhanced reliability screening. The SMAJ22-E3/5A remains suitable for non-safety-critical automotive body electronics where customer-specific validation suffices.
What is the surge current rating of the SMAJ22-E3/5A for an 8.3 ms half-sine waveform?
The SMAJ22-E3/5A supports a peak forward surge current (IFSM) of 40 A for an 8.3 ms single half-sine waveform, applicable only to unidirectional types. This rating enables robust protection against sustained overcurrent events such as motor stall currents or transformer inrush, provided the device is mounted on recommended copper pad areas (0.2" × 0.2") per Vishay document 88390. The SMAJ22-E3/5A must be used in unidirectional configuration to leverage this capability.
How does the thermal resistance of the SMAJ22-E3/5A affect its power handling in real-world PCB layouts?
The SMAJ22-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. In compact layouts with reduced copper area or no internal ground planes, RθJA increases significantly - potentially halving the safe repetitive surge duty cycle. Derating curves in Fig. 2 of Vishay document 88390 show that at 100 °C ambient, the SMAJ22-E3/5A's 400 W rating drops to ~240 W; proper thermal design is essential for sustained reliability.
SMAJ22-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:
- 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-E3/5A FAQ
1.How can I place an order for SMAJ22-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22-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 SMAJ22-E3/5A reliable?
The price and inventory of SMAJ22-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 SMAJ22-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22-E3/5A?
SMAJ22-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22-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 SMAJ22-E3/5A?
For technical support, including SMAJ22-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22-E3/5A requirements.
6.How does Aetrix verify that SMAJ22-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22-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 SMAJ22-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22-E3/5A?
All SMAJ22-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22-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 SMAJ22-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ22-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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