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Microchip Technology SMAJ20CE3/TR13
- Part No.:
- SMAJ20CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20CE3/TR13.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
SMAJ20CE3/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 20 V reverse standoff voltage (VWM), 35.8 V maximum clamping voltage (VC) at 13.9 A peak pulse current (IPP), and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom power supplies, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ20CE3/TR13 datasheet, SMAJ20CE3/TR13 pinout, SMAJ20CE3/TR13 application, or SMAJ20CE3/TR13 equivalent, key selection criteria include bidirectional clamping capability, 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 with identical breakdown (VBR ≥ 22.2 V @ 1 mA) and clamping characteristics in either direction. Its sub-5 ns response time enables effective suppression of fast transients including ESD events (±15 kV air, ±8 kV contact) and electrical fast transients (EFT) up to 4 kV.
The device is rated for continuous operation from –65 °C to +150 °C, with thermal resistance of 15 °C/W junction-to-lead and 80 °C/W junction-to-ambient on FR4 (1 oz Cu). Its 0.064 g mass and void-free UL94V-0 epoxy case support high-reliability automated assembly in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 20 V - Maximum continuous DC or RMS voltage before conduction begins; sets operating margin for 24 V nominal systems. |
| VBR (Min) | 22.2 V @ 1 mA - Confirmed minimum breakdown threshold ensures reliable turn-on above normal operating voltage. |
| VC @ IPP | 35.8 V @ 13.9 A - Clamping voltage limits downstream component stress during 10/1000 µs surges. |
| PPP | 500 W - Peak pulse power handling capacity defines survivability under standardized lightning-induced surges. |
| IPP | 13.9 A - Peak current supported at VC; correlates directly to IEC61000-4-5 Class 4 (12 Ω source) immunity level. |
| Leakage (ID) | <1 µA @ 20 V - Negligible standby current avoids battery drain or signal integrity degradation in low-power circuits. |
| Package | DO-214AC (SMA) - Industry-standard footprint compatible with automated pick-and-place and reflow profiles up to 260 °C. |
Pinout & Package
DO-214AC (SMA) package with two terminals: symmetrical bidirectional construction has no polarity marking; cathode band omitted per specification for CA-suffix devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient return path | Both terminals function identically as surge shunt nodes; connects between protected line and ground or between differential lines. |
| Case | Thermal & mechanical interface | Void-free UL94V-0 epoxy body provides mechanical stability and thermal conduction to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| IEC61000-4-5 Class 4 compliance | Validated for 12 Ω source impedance lightning surges up to 1 kV (line-earth) in 24 V systems. |
| RoHS-compliant matte-tin plating | Ensures solderability and intermetallic reliability per MIL-STD-750 Method 2026, eliminating lead-based process risks. |
| Fast <5 ns response | Suppresses ESD and EFT transients before sensitive ICs experience latch-up or gate oxide damage. |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to reflow, reducing manufacturing cost and cycle time. |
Applications
| Industrial PLC Analog Inputs | Automotive Body Control Module Power Rails |
|---|---|
Use Scenario: Protection of 4–20 mA current-loop sensor interfaces against induced surges from nearby motor switching or relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp common-mode transients before they reach precision op-amps and ADC front-ends. Use Value: Maintains signal integrity by limiting voltage excursion to ≤35.8 V, preventing ADC saturation and enabling uninterrupted data acquisition during EMC testing. | Use Scenario: Safeguarding 12 V supply inputs to microcontrollers and CAN transceivers against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VCC rail, coordinated with upstream fuses and downstream LDOs to meet ISO 7637-2 Pulse 1/2a/5a requirements. Use Value: Withstands 500 W surges without degradation, ensuring BCU continues operation after repeated 12 V system disturbances. |
| Telecom PoE Midspan Injectors | Medical Patient Monitor Signal Lines |
Use Scenario: Transient suppression on 48 V DC power pairs feeding IEEE 802.3af/at PDs, exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary protection stage after primary gas discharge tube (GDT), clamping residual energy before it reaches Ethernet PHY magnetics. Use Value: 35.8 V clamping ensures PoE controller ICs remain within absolute maximum ratings even during worst-case 10/1000 µs surges. | Use Scenario: ESD protection of isolated analog front-end channels (ECG, SpO₂) connected to patient electrodes, subject to ±15 kV human-body-model discharges. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed at connector entry point to divert ESD current away from instrumentation amplifiers. Use Value: Sub-5 ns response prevents amplifier input-stage damage, preserving diagnostic accuracy and meeting IEC 61000-4-2 Level 4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Same electrical specs but non-RoHS (SnPb plating); lacks "e3" suffix and tape/reel "TR13" packaging. | Not suitable for new RoHS-compliant designs; requires legacy Pb-based assembly processes. | Select SMAJ20CE3/TR13 when RoHS compliance and 13-inch reel logistics are required. |
| SMBJ20CA-E3/52 | Higher 600 W PPP, same VWM/VC, but SMB (DO-214AA) package - 1.6 mm wider body and different pad layout. | Requires PCB footprint redesign; offers higher surge margin but occupies more board area. | Choose SMBJ20CA-E3/52 only if 600 W rating is mandatory and layout revision is feasible. |
Compared with SMAJ20CA and SMBJ20CA-E3/52, SMAJ20CE3/TR13 delivers certified RoHS compliance, optimized DO-214AC footprint for high-density layouts, and factory-verified 13-inch tape-and-reel delivery - balancing regulatory readiness, space efficiency, and production scalability.
Availability
SMAJ20CE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive body control module power rails, and telecom PoE midspan injectors requiring stable component supply across extended product lifecycles.
Supply support for SMAJ20CE3/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 harsh environments - delivering consistent 500 W surge handling, rapid response, and long-term stability under thermal cycling and humidity exposure.
FAQ
What does the 'C' and 'E3' suffix mean in SMAJ20CE3/TR13?
The 'C' indicates bidirectional configuration - enabling symmetrical clamping for AC or floating signals. The 'E3' denotes RoHS-compliant matte-tin plating per IPC/JEDEC standards. Together, SMAJ20CE3/TR13 specifies a lead-free, bidirectional 20 V TVS in DO-214AC package supplied on 13-inch reels. This exact configuration ensures compliance with modern environmental regulations and automated assembly requirements.
Is SMAJ20CE3/TR13 suitable for IEC61000-4-5 Level 4 surge protection?
Yes - SMAJ20CE3/TR13 is validated for IEC61000-4-5 Class 4 (12 Ω source impedance) in 24 V systems, supporting up to 1 kV line-earth surges. Its 35.8 V clamping voltage at 13.9 A peak current ensures protected circuitry remains within safe operating limits during standardized lightning-induced transients. This performance is documented in Microsemi's MSC0270A datasheet for SMAJ20CE3/TR13.
What is the thermal resistance of SMAJ20CE3/TR13, and how does it affect PCB layout?
SMAJ20CE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and junction-to-ambient of 80 °C/W on FR4 with 1 oz Cu and recommended footprint. To maintain reliability under repeated 500 W surges, designers must use adequate copper pour connected to both terminals and avoid narrow traces. The DO-214AC package's wide leads facilitate heat spreading - critical for sustaining surge endurance in compact industrial enclosures.
Can SMAJ20CE3/TR13 replace SMAJ20A in an existing design?
No - SMAJ20A is unidirectional with cathode marking and forward surge capability; SMAJ20CE3/TR13 is bidirectional with no polarity marking and symmetrical clamping. Substituting them requires verifying circuit topology: SMAJ20CE3/TR13 is appropriate for AC-coupled or differential lines, while SMAJ20A suits DC rails referenced to ground. Using SMAJ20CE3/TR13 in place of SMAJ20A may compromise protection in polarized configurations.
What is the maximum steady-state power dissipation for SMAJ20CE3/TR13 at room temperature?
SMAJ20CE3/TR13 dissipates 1.56 W continuously at 25 °C ambient when mounted on FR4 with recommended footprint - derived from its 5 W rating at 75 °C lead temperature and thermal resistance profile. This value governs derating in thermally constrained applications such as sealed medical enclosures or stacked PCB assemblies where airflow is limited.
SMAJ20CE3/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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- 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)
SMAJ20CE3/TR13 FAQ
1.How can I place an order for SMAJ20CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20CE3/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 SMAJ20CE3/TR13 reliable?
The price and inventory of SMAJ20CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ20CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20CE3/TR13?
SMAJ20CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20CE3/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 SMAJ20CE3/TR13?
For technical support, including SMAJ20CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ20CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ20CE3/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 SMAJ20CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ20CE3/TR13?
All SMAJ20CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20CE3/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 SMAJ20CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ20CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20CE3/TR13 Tags
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