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Microchip Technology SMAJ20AE3/TR13
- Part No.:
- SMAJ20AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20AE3/TR13.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,272
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Product details
Overview
SMAJ20AE3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for primary overvoltage protection of DC power rails and signal lines. It features a 20 V working peak standoff voltage (VWM), 22.2 V minimum breakdown voltage (VBR), 35.8 V maximum clamping voltage (VC) at 13.9 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform-used in industrial power supply input stages and Ethernet PHY interfaces.
For engineers reviewing the SMAJ20AE3/TR13 datasheet, SMAJ20AE3/TR13 pinout, SMAJ20AE3/TR13 application, or SMAJ20AE3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 secondary lightning surge (42 Ω source), RoHS-compliant matte-tin plating, DO-214AC package thermal resistance (15 °C/W junction-to-lead), and compatibility with automated SMT reflow per JEDEC J-STD-020B Level 1 moisture sensitivity.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt device triggered above its 22.2 V breakdown threshold, delivering sub-100 ps response time to suppress ESD (IEC61000-4-2 ±8 kV contact), EFT (IEC61000-4-4 ±2 kV), and induced surges. Its low 15 °C/W junction-to-lead thermal resistance enables reliable 500 W transient dissipation without external heatsinking when mounted on FR4 with recommended footprint.
The SMAJ20AE3/TR13 uses a void-free thermosetting epoxy case (UL94V-0 rated) with C-bend leads and cathode band marking. It supports tape-and-reel delivery (12 mm carrier, 2500/reel) and meets MIL-PRF-19500 screening options when prefixed with MX-though the "E3/TR13" suffix confirms RoHS compliance and standard commercial-grade screening only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC rail margin for 24 V systems. |
| VBR min @ IBR | 22.2 V @ 1 mA - Minimum voltage at which avalanche conduction begins; ensures predictable turn-on above nominal rail. |
| VC @ IPP | 35.8 V @ 13.9 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤36 V in 24 V bus protection. |
| PPP | 500 W - Peak pulse power handling per standard waveform; supports Class 4 secondary lightning per IEC61000-4-5 (12 Ω source). |
| ID @ VWM | <1 μA - Reverse leakage at 20 V; negligible power loss and noise injection in always-on monitoring circuits. |
| TJ Range | −65 °C to +150 °C - Full operational temperature range; validated for automotive under-hood and industrial control cabinet use. |
| Package | DO-214AC (SMAJ) - Standardized surface-mount outline with 1.70–2.26 mm body width and 3.99–4.50 mm length; compatible with IPC-7351B footprints. |
Pinout & Package
DO-214AC (SMAJ) package: molded thermosetting epoxy case, UL94V-0 rated, with C-bend matte-tin plated leads. Cathode indicated by black band. Moisture sensitivity level 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; completes shunt path during transient event. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V rail or Ethernet pair); carries full surge current to ground via anode. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Enables single-device protection against IEC61000-4-5 Class 4 surges (12 Ω source) without parallel staging. |
| 35.8 V clamping at 13.9 A | Keeps protected 24 V logic interfaces (e.g., RS-485 transceivers) below absolute maximum ratings during transients. |
| Sub-100 ps response time | Prevents ESD damage to CMOS inputs before internal protection diodes activate; meets IEC61000-4-2 Level 4. |
| RoHS-compliant matte-tin plating | Ensures solderability and intermetallic reliability in Pb-free reflow profiles up to 260 °C for 10 s. |
| DO-214AC mechanical robustness | Wide lead geometry provides low thermal resistance (15 °C/W) and high surge current endurance (40 A forward surge). |
Applications
| Industrial 24 V Power Input Protection | RS-485 Transceiver Line Protection |
|---|---|
Use Scenario: 24 V DC power entry point on PLC I/O modules exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND to clamp surges before they reach DC/DC converter input stage. Use Value: Limits clamped voltage to 35.8 V, ensuring downstream 40 V-rated input capacitors and controllers remain within safe operating area. |
Use Scenario: Differential data lines of isolated RS-485 transceivers in factory automation networks subject to cable-induced surges. IC Role / Device Role / Timing Role: One SMAJ20AE3/TR13 per line (A and B), cathode to line, anode to local ground, providing common-mode surge suppression. Use Value: Sub-100 ps response prevents latch-up in transceiver ESD structures while maintaining signal integrity up to 10 Mbps. |
| Automotive Body Control Module (BCM) Sensors | POE-Powered Ethernet Switch Ports |
Use Scenario: 12–24 V sensor supply lines (e.g., temperature, pressure) routed through vehicle chassis with high EMI coupling risk. IC Role / Device Role / Timing Role: TVS mounted at connector interface to divert ISO 7637-2 Pulse 1/2a/5a energy away from ASIC front-end circuitry. Use Value: 500 W rating handles 100 V/50 ms load dump pulses; −65 °C to +150 °C rating supports under-hood deployment. |
Use Scenario: Data pairs on IEEE 802.3af/at PoE ports where DC bias (up to 57 V) coexists with fast transients from cable coupling. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to mid-point bias voltage, clamping common-mode surges on powered pairs. Use Value: 20 V VWM allows operation with 24 V auxiliary bias rails; 35.8 V VC protects 36 V-rated PoE controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3/TR13 | Same electrical specs but includes high-reliability screening (HTRB, surge, thermal cycling) per MIL-PRF-19500 JANTX requirements. | Required for avionics, defense, or extended-life industrial deployments where 100% lot testing is mandated. | Select SMAJ20AHE3/TR13 only if qualification to MIL-PRF-19500 is contractually required; otherwise SMAJ20AE3/TR13 suffices. |
| SMBJ20A-E3/52 | DO-214AA package (smaller footprint), same VWM/VC, but lower 400 W PPP rating and higher 20 °C/W thermal resistance. | Suitable for space-constrained consumer electronics where 400 W surge margin is acceptable and thermal mass is limited. | Choose SMBJ20A-E3/52 only when PCB real estate is critical and peak surge exposure is below IEC61000-4-5 Class 3. |
Compared with SMAJ20AHE3/TR13, the SMAJ20AE3/TR13 omits high-reliability screening but retains identical clamping and thermal performance for commercial industrial use; versus SMBJ20A-E3/52, it delivers 25% higher surge power handling and 25% better thermal dissipation in the same functional role.
Availability
SMAJ20AE3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, RS-485 interface hardening, automotive sensor line safeguarding, and PoE port surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ20AE3/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 robust, surface-mount transient suppression in harsh environments-prioritizing low clamping voltage, high surge power density, and long-term stability under thermal cycling and humidity exposure.
FAQ
What is the clamping voltage of the SMAJ20AE3/TR13 under a 10/1000 µs surge?
The SMAJ20AE3/TR13 has a maximum clamping voltage (VC) of 35.8 V at 13.9 A peak pulse current under the standardized 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.
Is the SMAJ20AE3/TR13 unidirectional or bidirectional?
The SMAJ20AE3/TR13 is a unidirectional transient voltage suppressor, indicated by the "A" suffix (as opposed to "CA" or "C"). It conducts only in reverse bias above its 22.2 V breakdown voltage and must be installed with cathode toward the protected line and anode to ground.
Does the SMAJ20AE3/TR13 meet IEC61000-4-5 for lightning surge protection?
Yes-the SMAJ20AE3/TR13 is rated for secondary lightning protection per IEC61000-4-5 with both 12 Ω and 42 Ω source impedances. At 12 Ω, it supports Class 4 (highest severity); at 42 Ω, it supports Class 1, making it suitable for AC/DC power entry and telecom line protection.
What is the moisture sensitivity level (MSL) of the SMAJ20AE3/TR13?
The SMAJ20AE3/TR13 has a moisture sensitivity level (MSL) of Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without dry packing or baking prior to reflow soldering.
Can the SMAJ20AE3/TR13 replace older SMAJ20A parts without design changes?
Yes-the SMAJ20AE3/TR13 is a direct form-fit-function replacement for legacy SMAJ20A variants, retaining identical DO-214AC package dimensions, electrical specifications, and thermal characteristics; the "E3" suffix denotes RoHS compliance and "TR13" indicates 2500-unit tape-and-reel packaging.
SMAJ20AE3/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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- 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)
SMAJ20AE3/TR13 FAQ
1.How can I place an order for SMAJ20AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20AE3/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 SMAJ20AE3/TR13 reliable?
The price and inventory of SMAJ20AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ20AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20AE3/TR13?
SMAJ20AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20AE3/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 SMAJ20AE3/TR13?
For technical support, including SMAJ20AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ20AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ20AE3/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 SMAJ20AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ20AE3/TR13?
All SMAJ20AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20AE3/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 SMAJ20AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ20AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20AE3/TR13 Tags
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