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Microchip Technology SMAJ28CAE3/TR13
- Part No.:
- SMAJ28CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CAE3/TR13.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,975
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Product details
Overview
SMAJ28CAE3/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 28 V reverse standoff voltage (VWM), 31.1 V minimum breakdown voltage (VBR), 50.0 V maximum clamping voltage (VC) at 9.9 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 control units.
For engineers reviewing the SMAJ28CAE3/TR13 datasheet, SMAJ28CAE3/TR13 pinout, SMAJ28CAE3/TR13 application, or SMAJ28CAE3/TR13 equivalent, key selection criteria include bidirectional clamping capability, RoHS-compliant matte-tin plating, DO-214AC package compatibility, IEC61000-4-2/4-4/4-5 compliance, and tape-and-reel packaging for automated SMT assembly.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its sub-5 ns clamping response time ensures effective suppression of fast transients including ESD events (±15 kV air, ±8 kV contact) and electrical fast transients (EFT).
The device uses silicon avalanche diode technology with a thermoset epoxy case rated UL94V-0, mounted on FR4 PCB with recommended footprint for 15 °C/W junction-to-lead thermal resistance. It supports steady-state dissipation of 1.56 W at 25 °C ambient and 5 W at 75 °C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR min | 31.1 V @ 1 mA - Minimum avalanche breakdown threshold; guarantees reliable turn-on above nominal system voltage. |
| VC @ IPP | 50.0 V @ 9.9 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPP | 500 W - Peak pulse power handling capacity; enables protection against high-energy surges like IEC61000-4-5 Class 3 (42 Ω source). |
| IPP | 9.9 A - Peak pulse current supported at VC; correlates directly to surge energy (W × s) under standardized waveform. |
| ID @ VWM | <1 µA - Ultra-low leakage at standoff voltage; prevents measurable power loss or signal distortion in low-current circuits. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with wide leads for thermal conduction and mechanical reliability. |
Pinout & Package
DO-214AC (SMA) package: void-free transfer-molded thermosetting epoxy case (UL94V-0), C-bend (modified J-bend) leads with RoHS-compliant annealed matte-tin plating, cathode band omitted for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Identical clamping behavior in both directions; no polarity marking required; suitable for AC or floating nodes. |
| Case / Body | Non-electrical thermal path | Provides mechanical mounting and heat conduction via solder joints to PCB copper; no electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential signals, AC lines, or ungrounded interfaces without polarity concerns. |
| IEC61000-4-5 Class 3 support | Withstands 42 Ω source impedance secondary lightning surges up to 1 kV open-circuit voltage (VOC) per standard test setup. |
| RoHS-compliant "e3" finish | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; no dry pack required prior to reflow. |
| Tape-and-reel packaging | TR13 format (13-inch reel, 2500 pcs) supports high-volume automated placement with EIA-481-1-A compliance. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC analog input channels in programmable logic controllers from field-induced surges and wiring faults. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp transients before reaching precision ADC front-end. Use Value: Limits clamped voltage to 50.0 V, ensuring downstream op-amps and isolators remain within absolute maximum ratings during 1 kV/42 Ω IEC61000-4-5 surges. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in vehicle door modules exposed to load dump and ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail and bidirectional data lines to absorb ±8 kV contact ESD per ISO10605 and load dump spikes. Use Value: Sub-5 ns response captures fast ESD transients; 28 V VWM provides margin above 14 V nominal battery voltage while avoiding false triggering. |
| Telecom Ethernet Surge Protection | Medical Diagnostic Equipment Interface |
Use Scenario: Secondary-level surge protection on PoE-powered Ethernet ports in network edge devices subjected to induced lightning currents. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pairs (e.g., TX+/TX−) referenced to local ground plane to suppress common-mode surges. Use Value: Symmetric clamping ensures balanced voltage excursion across both lines, preserving signal integrity and preventing receiver latch-up during 10/1000 µs surges. | Use Scenario: Protecting isolated USB and RS-232 interfaces in portable ultrasound and patient monitoring devices from hospital-grade ESD and EFT. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS on isolated side of digital interface to avoid compromising galvanic isolation or introducing measurement offset. Use Value: Maintains <1 µA standby current at 28 V, eliminating drift in high-impedance medical sensor signal paths while delivering full 500 W surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA | No "e3" RoHS suffix; SnPb plating instead of matte-tin; identical electrical specs and DO-214AC package. | Not suitable for lead-free manufacturing; requires different reflow profile and violates modern environmental compliance mandates. | Select SMAJ28CAE3/TR13 when RoHS and JEDEC J-STD-020B Level 1 moisture compliance are required. |
| SMBJ28CA-E3/52 | Higher 600 W PPP, larger DO-214AA (SMB) package, 51.0 V VC @ 11.2 A IPP; otherwise same VWM/VBR ratings. | Offers higher surge margin but requires PCB layout change due to larger footprint and thermal mass. | Choose SMBJ28CA-E3/52 only when system-level testing confirms need for >500 W surge headroom and board space permits SMB package. |
Compared with SMAJ28CA and SMBJ28CA-E3/52, SMAJ28CAE3/TR13 uniquely balances RoHS compliance, industry-standard DO-214AC footprint, and verified 500 W IEC61000-4-5 Class 3 performance - making it optimal for cost-sensitive, high-volume industrial and automotive SMT production where lead-free process control and footprint reuse are critical.
Availability
SMAJ28CAE3/TR13 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ28CAE3/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, targeting applications demanding rapid response, repeatable clamping, and compliance with IEC61000-4-x immunity standards.
FAQ
What is the clamping voltage of SMAJ28CAE3/TR13 at its rated peak pulse current?
The SMAJ28CAE3/TR13 has a maximum clamping voltage (VC) of 50.0 V at 9.9 A peak pulse current (IPP) under the 10/1000 µs standard waveform. This value is measured across the device terminals during surge conditions and defines the upper voltage limit imposed on protected circuitry - critical for ensuring downstream ICs remain within their absolute maximum ratings during transient events.
Is SMAJ28CAE3/TR13 suitable for protecting bidirectional communication lines like RS-485?
Yes, SMAJ28CAE3/TR13 is explicitly designed for bidirectional operation, with symmetrical clamping characteristics in both polarities. Its DO-214AC package and 28 V standoff voltage provide appropriate margin for 24 V RS-485 common-mode ranges, and its sub-5 ns response time effectively suppresses ESD and EFT events without distorting differential signaling integrity.
Does SMAJ28CAE3/TR13 meet IEC61000-4-5 Class 3 requirements?
Yes, SMAJ28CAE3/TR13 is rated for IEC61000-4-5 secondary lightning surge protection at Class 3 (42 Ω source impedance) per the manufacturer's documentation. Its 500 W peak pulse power rating and 50.0 V clamping voltage at 9.9 A ensure compliance when applied with proper PCB layout and grounding - validated for 1 kV open-circuit voltage tests.
What does the "TR13" suffix indicate in SMAJ28CAE3/TR13?
The "TR13" suffix in SMAJ28CAE3/TR13 denotes tape-and-reel packaging on a 13-inch reel containing 2500 units, compliant with EIA-481-1-A standards. This format enables automated pick-and-place assembly and is distinct from bulk or ammo-pack options - confirming the part is supplied ready for high-volume SMT production.
How does the "e3" designation affect the solderability and reliability of SMAJ28CAE3/TR13?
The "e3" suffix indicates RoHS-compliant matte-tin plating per JEDEC J-STD-020B Level 1 moisture sensitivity - meaning no dry pack is required prior to reflow, and the device supports standard Pb-free solder profiles up to 260 °C for 10 seconds. This ensures consistent wetting, intermetallic formation, and long-term joint reliability in commercial and industrial applications.
SMAJ28CAE3/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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 11A
- 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)
SMAJ28CAE3/TR13 FAQ
1.How can I place an order for SMAJ28CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CAE3/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 SMAJ28CAE3/TR13 reliable?
The price and inventory of SMAJ28CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ28CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CAE3/TR13?
SMAJ28CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CAE3/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 SMAJ28CAE3/TR13?
For technical support, including SMAJ28CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ28CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ28CAE3/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 SMAJ28CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ28CAE3/TR13?
All SMAJ28CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CAE3/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 SMAJ28CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ28CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28CAE3/TR13 Tags
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