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Microchip Technology SMAJ22E3/TR13
- Part No.:
- SMAJ22E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22E3/TR13.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,650
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Product details
Overview
SMAJ22E3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 500 W peak pulse power at 10/1000 µs, with 22 V working standoff voltage (VWM), 24.4 V minimum breakdown voltage (VBR), and 39.4 V maximum clamping voltage (VC) at 12.7 A peak pulse current - used for ESD/EFT protection on DC power rails and signal lines in industrial control and telecom interfaces.
For engineers reviewing the SMAJ22E3/TR13 datasheet, SMAJ22E3/TR13 pinout, SMAJ22E3/TR13 application, or SMAJ22E3/TR13 equivalent, key selection criteria include verified clamping performance under IEC61000-4-2 (±15 kV air/±8 kV contact), bidirectional variant availability (SMAJ22CAE3/TR13), RoHS-compliant matte-tin plating, and compatibility with standard SMA footprint per IPC/JEDEC J-STD-020B Level 1 moisture sensitivity.
Technical Context
This TVS operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds VBR = 24.4 V (at IBR = 1 mA), clamping transients to ≤39.4 V within <100 ps response time. It sustains 500 W peak pulse power at 25 °C with 0.01% duty cycle, and exhibits 1 μA max standby leakage at 22 V.
Thermal design relies on low junction-to-lead thermal resistance (15 °C/W) and FR4 board mounting with recommended pad layout; steady-state dissipation is 1.56 W at 25 °C ambient or 5 W at 75 °C lead temperature. Polarity is marked by cathode band; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins. |
| VBR min | 24.4 V @ 1 mA - Confirmed avalanche initiation threshold for reliable overvoltage triggering. |
| VC @ IPP | 39.4 V @ 12.7 A - Clamped voltage during 10/1000 µs surge, defining protected circuit stress level. |
| PPP | 500 W - Peak transient energy handling capacity, enabling robust secondary lightning (IEC61000-4-5 Class 4) protection. |
| ID max | 1 μA @ 22 V - Low leakage ensures minimal power loss and signal integrity in high-impedance circuits. |
| tRESP | <100 ps - Sub-nanosecond response enables effective suppression of ESD events per IEC61000-4-2. |
| TOP/TSTG | −65 °C to +150 °C - Wide temperature range supports operation in automotive under-hood and industrial environments. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case (UL94V-0), C-bend leads with RoHS-compliant annealed matte-tin plating, cathode indicated by band, weight 0.064 g, moisture sensitivity Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected line | Connected to signal/power line requiring transient protection; forward-biased during normal operation. |
| Cathode | Ground reference / clamp path | Connected to system ground or low-impedance return path; conducts surge current to ground when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture classification and eliminates lead-based solder concerns. |
| 500 W peak pulse rating | Supports IEC61000-4-5 secondary lightning protection up to Class 4 (12 Ω source impedance) without derating. |
| Fast clamping response | <100 ps theoretical turn-on enables suppression of ESD events before IC damage occurs. |
| Standard SMA footprint | Compatible with automated SMT assembly and IPC-recommended pad layout (A=1.70–2.26 mm, D=4.93–5.48 mm). |
Applications
| Industrial PLC I/O Protection | Telecom Line Interface |
|---|---|
Use Scenario: 24 V DC input/output channels in programmable logic controllers exposed to inductive switching surges and field wiring faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between channel and ground to clamp transients before reaching isolation amplifiers or microcontroller GPIOs. Use Value: Limits voltage to ≤39.4 V during 12.7 A surge, preventing latch-up or gate oxide damage in downstream analog front-end ICs. | Use Scenario: RS-485 or Ethernet PHY interface lines in base station equipment subject to ESD and induced RF coupling. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before signal conditioning filters and transceivers. Use Value: Sub-100 ps response ensures clamping occurs prior to 15 kV ESD event propagation into sensitive differential receivers. |
| Automotive Body Control Module | Power Supply Input Stage |
Use Scenario: 12 V battery-supplied modules (e.g., door lock actuators) experiencing load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT rail upstream of LDO regulators and MCU power pins. Use Value: Withstands 500 W surges while maintaining 22 V nominal operation, eliminating need for bulkier through-hole alternatives like P6KE22A. | Use Scenario: Input stage of AC/DC or DC/DC converters where rectified bus voltage must be stabilized against line transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to absorb line-induced spikes before they reach switching controller ICs. Use Value: 39.4 V clamping ensures MOSFET gate drivers and PWM controllers remain within safe operating area during 10/1000 µs surges. |
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/TR13 | Same VWM, VBR, VC, and package; differs only in screening grade (standard vs. enhanced reliability). | No functional difference; identical electrical specs and mechanical form factor. | Select SMAJ22E3/TR13 for RoHS compliance and standard industrial qualification; SMAJ22A-E3/TR13 if legacy part number alignment is required. |
| SMAJ22CAE3/TR13 | Bidirectional variant: symmetric clamping (VC = 39.4 V in both polarities), same VWM and PPP. | Required for AC-coupled or floating signal lines (e.g., USB D+/D−, audio inputs) where polarity reversal may occur. | Choose SMAJ22CAE3/TR13 only when protecting bidirectional signals; SMAJ22E3/TR13 remains optimal for DC rails with defined polarity. |
Compared with SMAJ22A-E3/TR13, SMAJ22E3/TR13 offers identical protection performance with assured RoHS compliance; versus SMAJ22CAE3/TR13, it provides lower-cost unidirectional clamping optimized for fixed-polarity power and signal paths without sacrificing surge capability.
Availability
SMAJ22E3/TR13 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive body electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ22E3/TR13 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
Microsemi (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on ruggedized protection and timing solutions.
The SMAJ series targets surface-mount transient suppression in space-constrained, high-surge environments - engineered specifically for IEC61000-4-2/4-4/4-5 compliance without external biasing or complex layout.
FAQ
What is the clamping voltage of SMAJ22E3/TR13 under a 10/1000 µs surge?
The SMAJ22E3/TR13 has a maximum clamping voltage (VC) of 39.4 V when subjected to its rated peak pulse current of 12.7 A under the 10/1000 µs waveform. This value is measured per Figure 2 in the official Microsemi MSC0270A datasheet and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ22E3/TR13 RoHS compliant and what does the "e3" suffix indicate?
Yes, SMAJ22E3/TR13 is RoHS compliant. The "e3" suffix denotes annealed matte-tin plating per JEDEC standards, confirming lead-free termination and compliance with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity - no dry pack required prior to reflow. This specification is explicitly stated in the Microsemi MSC0270A datasheet revision L.
What is the standoff voltage and why is it critical for SMAJ22E3/TR13 placement?
The standoff voltage (VWM) of SMAJ22E3/TR13 is 22 V - the maximum continuous reverse voltage it can withstand without entering breakdown. This parameter dictates placement: it must be higher than the normal operating voltage of the protected line (e.g., 24 V DC rail with margin) but low enough to activate before downstream ICs exceed absolute maximum ratings.
Does SMAJ22E3/TR13 support IEC61000-4-5 lightning surge testing?
Yes, SMAJ22E3/TR13 supports IEC61000-4-5 secondary lightning surge testing up to Class 4 (12 Ω source impedance) and Class 1 (42 Ω source impedance), as confirmed in the Applications section of the MSC0270A datasheet. Its 500 W peak pulse rating and 39.4 V clamping enable compliance without additional series impedance.
What package type and footprint does SMAJ22E3/TR13 use?
SMAJ22E3/TR13 uses the DO-214AC (SMA) surface-mount package with standardized dimensions: length 4.93–5.48 mm, width 2.57–2.79 mm, height 2.26 mm max. Its recommended PCB pad layout follows IPC/JEDEC guidelines with thermal relief pads to ensure 15 °C/W junction-to-lead thermal resistance, as detailed on page 5 of the MSC0270A datasheet.
SMAJ22E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 12.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22E3/TR13 FAQ
1.How can I place an order for SMAJ22E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22E3/TR13 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 SMAJ22E3/TR13 reliable?
The price and inventory of SMAJ22E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ22E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22E3/TR13?
SMAJ22E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22E3/TR13 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 SMAJ22E3/TR13?
For technical support, including SMAJ22E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22E3/TR13 requirements.
6.How does Aetrix verify that SMAJ22E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ22E3/TR13 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 SMAJ22E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ22E3/TR13?
All SMAJ22E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22E3/TR13, 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 SMAJ22E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ22E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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