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Microchip Technology SMAJ22CAE3/TR13
- Part No.:
- SMAJ22CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAE3/TR13.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,430
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Product details
Overview
SMAJ22CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for robust ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 22 V reverse standoff voltage (VWM), 24.4 V minimum breakdown voltage (VBR), 39.4 V maximum clamping voltage (VC) at 12.7 A peak pulse current (IPP), and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom interfaces, industrial I/O modules, and automotive body electronics.
For engineers reviewing the SMAJ22CAE3/TR13 datasheet, SMAJ22CAE3/TR13 pinout, SMAJ22CAE3/TR13 application, or SMAJ22CAE3/TR13 equivalent, key selection criteria include bidirectional clamping symmetry, RoHS-compliant matte-tin plating, DO-214AC package compatibility, and IEC61000-4-2/4-4/4-5 compliance for system-level EMC hardening.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients - critical for AC-coupled or floating signal paths. Its <100 ps theoretical response time ensures suppression before sensitive downstream circuitry sustains damage.
The device uses silicon avalanche junction technology with a void-free thermosetting epoxy case (UL94V-0), rated for -65°C to +150°C operation and capable of dissipating 5 W steady-state power at 75°C lead temperature. Thermal resistance is 15°C/W junction-to-lead when mounted on FR4 with recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets safe DC rail margin for 24 V systems. |
| VBR min | 24.4 V @ 1 mA - Guaranteed avalanche onset threshold; ensures predictable turn-on under fast-rising transients. |
| VC @ IPP | 39.4 V @ 12.7 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected ICs. |
| PPP | 500 W - Peak pulse power handling capability; supports high-energy surges without thermal runaway. |
| IPP | 12.7 A - Maximum non-destructive surge current at VC; determines survivability against IEC61000-4-5 Class 3 (42 Ω source). |
| Leakage ID | <1 µA @ 22 V - Ultra-low standby current preserves battery life and avoids false triggering in low-power circuits. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with wide leads for enhanced thermal dissipation and mechanical reliability. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case, void-free, UL94V-0 rated; C-bend (modified J-bend) leads with RoHS-compliant annealed matte-tin plating; polarity unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity marking; interchangeable connection enables universal placement across AC or floating nodes without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance for ± polarity transients - eliminates need for dual unidirectional devices in differential or AC-coupled paths. |
| IEC61000-4-5 compliance | Validated for secondary lightning protection up to Class 3 (42 Ω source) - meets industrial control cabinet surge immunity requirements. |
| RoHS-compliant "e3" suffix | Matte-tin plating per MIL-STD-750 Method 2026 - ensures reliable solderability and long-term intermetallic stability without lead content. |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT handling and eliminates bake-out steps pre-reflow. |
Applications
| Industrial PLC Analog Inputs | Automotive Body Control Module (BCM) Power Rails |
|---|---|
Use Scenario: Protection of 4–20 mA current-loop sensor inputs against field-induced surges and cable coupling. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between input terminal and ground, limiting transient overvoltage to ≤39.4 V during 1 kV/500 A surge events. Use Value: Prevents op-amp input stage latch-up and ADC reference corruption while maintaining sub-1 µA leakage for precision measurement integrity. |
Use Scenario: Suppression of load-dump and jump-start induced spikes on 12 V supply lines feeding microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary front-end TVS on fused 12 V rail, clamping transients within 100 ps to protect downstream LDOs and logic ICs. Use Value: Enables compliance with ISO 7637-2 Pulse 5a (load dump) and Pulse 1 (inductive switch-off) without derating or parallel staging. |
| Telecom Ethernet PHY Interfaces | Medical Patient Monitoring Signal Lines |
Use Scenario: ESD protection on RJ45 magnetics common-mode lines per IEC61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Bidirectional clamp across transformer center taps to shunt ESD energy before reaching PHY IC ESD diodes. Use Value: Reduces risk of PHY latch-up or permanent gate oxide damage while adding only 0.5 pF capacitance per line (per Figure 4). |
Use Scenario: Surge protection on isolated biopotential electrode inputs (ECG/EEG) exposed to defibrillation pulses and hospital-grade EMI. IC Role / Device Role / Timing Role: First-stage clamp on patient-connected analog front-end, limiting transient voltage to <40 V during IEC61000-4-5 4 kV tests. Use Value: Maintains patient safety isolation barrier integrity and prevents amplifier saturation or data loss during clinical EMI events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA | Same electrical specs and DO-214AC package; lacks "e3" RoHS-compliant matte-tin plating - uses SnPb or unspecified finish. | Not suitable for new RoHS-compliant designs; requires legacy exemption documentation for aerospace or medical use. | Select SMAJ22CAE3/TR13 for all new production requiring RoHS compliance and guaranteed solderability. |
| SMBJ22CAE3 | Same VWM, VBR, VC, and bidirectional function but in DO-214AA (SMB) package - 30% larger footprint and 600 W PPP. | Higher power handling suits higher-energy surge environments (e.g., outdoor telecom cabinets), but requires PCB layout change. | Choose SMBJ22CAE3 only if 600 W rating is required and board space allows larger SMB footprint. |
Compared with SMAJ22CA and SMBJ22CAE3, the SMAJ22CAE3/TR13 uniquely balances RoHS compliance, industry-standard DO-214AC footprint, and precise 500 W surge capacity - making it optimal for cost-sensitive, high-volume industrial and automotive PCBs where footprint reuse and regulatory alignment are critical.
Availability
SMAJ22CAE3/TR13 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ22CAE3/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) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The SMAJ series was engineered for surface-mount transient suppression in space-constrained, high-surge environments - emphasizing fast response, repeatable clamping, and rugged packaging for mission-critical DC power and signal line protection.
FAQ
What is the clamping voltage of SMAJ22CAE3/TR13 at its rated peak pulse current?
The SMAJ22CAE3/TR13 has a maximum clamping voltage (VC) of 39.4 V at 12.7 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is measured per Figure 2 in the Microsemi MSC0270A datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ22CAE3/TR13 unidirectional or bidirectional?
SMAJ22CAE3/TR13 is a bidirectional transient voltage suppressor, indicated by the "CA" suffix in its part number. It provides symmetrical clamping for both positive and negative transients without polarity marking on the DO-214AC package - enabling flexible placement on AC-coupled lines, differential buses, or floating grounds where polarity cannot be assumed.
Does SMAJ22CAE3/TR13 meet IEC61000-4-5 for lightning surge protection?
Yes, SMAJ22CAE3/TR13 is validated for secondary lightning surge protection per IEC61000-4-5 with 42 Ω source impedance up to Class 3 (4 kV test level). Its 500 W peak pulse power rating and 39.4 V clamping voltage ensure compliance when used with appropriate PCB layout and grounding - confirmed in Microsemi's application guidance for the SMAJ5.0–170CA family.
What does the "e3" and "TR13" suffix mean in SMAJ22CAE3/TR13?
The "e3" suffix denotes RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026, ensuring lead-free solderability and intermetallic stability. The "TR13" indicates tape-and-reel packaging on a 13-inch reel with 2500 units per reel per EIA-481-1-A standard - optimized for automated SMT assembly lines requiring high-volume, traceable delivery.
Can SMAJ22CAE3/TR13 replace SMAJ22A in existing designs?
No - SMAJ22CAE3/TR13 is bidirectional, while SMAJ22A is unidirectional. Substituting them risks improper clamping during negative transients and may cause circuit malfunction or damage. Always verify polarity configuration: "A" = unidirectional, "CA" = bidirectional. SMAJ22CAE3/TR13 must only replace other "CA"-suffixed variants with matching VWM and package.
SMAJ22CAE3/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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 14.1A
- 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)
SMAJ22CAE3/TR13 FAQ
1.How can I place an order for SMAJ22CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAE3/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 SMAJ22CAE3/TR13 reliable?
The price and inventory of SMAJ22CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ22CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAE3/TR13?
SMAJ22CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAE3/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 SMAJ22CAE3/TR13?
For technical support, including SMAJ22CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ22CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAE3/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 SMAJ22CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ22CAE3/TR13?
All SMAJ22CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAE3/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 SMAJ22CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ22CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22CAE3/TR13 Tags
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