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Microchip Technology SMAJ28CE3/TR13
- Part No.:
- SMAJ28CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CE3/TR13.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,355
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Product details
Overview
SMAJ28CE3/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 at 10/1000 µs waveform - deployed in industrial motor drives, telecom interfaces, and automotive body control modules.
For engineers reviewing the SMAJ28CE3/TR13 datasheet, SMAJ28CE3/TR13 pinout, SMAJ28CE3/TR13 application, or SMAJ28CE3/TR13 equivalent, this page delivers verified electrical parameters, IEC61000-4-2/4-4/4-5 compliance details, DO-214AC package mechanical data, and validated alternative part comparisons - all specific to the bidirectional RoHS-compliant tape-and-reel variant with "e3" and "TR13" suffixes.
Technical Context
The SMAJ28CE3/TR13 implements a silicon avalanche diode structure optimized for sub-nanosecond response (<5 ns clamping delay for bidirectional operation) and low dynamic impedance under transient stress. Its symmetrical bidirectional configuration enables protection of AC-coupled or floating signal paths without polarity constraints.
It operates across –65 °C to +150 °C, supports 100% surge screening per MIL-PRF-19500 (with MX prefix), and maintains <1 μA standby leakage at rated VWM, ensuring minimal impact on low-power sensor or communication circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR min | 31.1 V @ 1 mA - Minimum voltage at which avalanche breakdown initiates, defining turn-on threshold. |
| VC @ IPP | 50.0 V @ 9.9 A - Clamped voltage during 10/1000 µs surge, limiting downstream component stress. |
| PPP | 500 W - Peak transient power dissipation capability, enabling protection against high-energy surges. |
| IPP | 9.9 A - Peak current the device safely shunts at VC, directly tied to system-level surge test levels. |
| ID @ VWM | <1 μA - Ultra-low leakage ensures negligible loading on precision analog or battery-powered circuits. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with wide leads for thermal dissipation and PCB current handling. |
Pinout & Package
DO-214AC (SMA) package: thermoset epoxy body, void-free molded, UL94V-0 rated; C-bend (modified J-bend) matte-tin plated terminals; cathode band omitted for bidirectional construction; marking reads "28C" (SMAJ prefix omitted per spec); weight 0.064 g; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No polarity designation - either terminal serves as anode or cathode depending on transient polarity. |
| Case / Body | Thermal path & mechanical anchor | Non-electrical; provides heat transfer to PCB copper and structural mounting stability. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Protects AC or differential signals without external polarity management or dual-device placement. |
| IEC61000-4-5 Class 4 compliance (12 Ω source) | Validated for secondary lightning transients up to 12 A peak in 4 kV test setups with 12 Ω source impedance. |
| RoHS-compliant "e3" termination | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity and lead-free assembly requirements. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A standard - optimized for automated SMT placement. |
| Sub-5 ns clamping response | Enables effective suppression of fast ESD events (IEC61000-4-2 ±8 kV contact) before sensitive ICs are damaged. |
Applications
| Industrial Motor Drives | Telecom Line Interfaces |
|---|---|
Use Scenario: Protection of gate drivers and encoder feedback lines against inductive switching spikes and ground bounce in 24–48 V DC bus systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across isolated signal pairs (e.g., RS-485 A/B) and low-side gate drive return paths. Use Value: Limits transient overshoot to ≤50.0 V, preventing latch-up or oxide damage in 3.3 V/5 V logic interfaces and MOSFET gate oxides rated ≤60 V. | Use Scenario: Surge hardening of Ethernet PHY front-end, POTS line cards, or DSL interface transformers exposed to induced RF and lightning-induced surges. IC Role / Device Role / Timing Role: Primary protection element across transformer secondary windings or differential data lines prior to ESD diode arrays. Use Value: Withstands 500 W pulses while maintaining <1 μA leakage - avoids DC bias shift or signal integrity degradation in 10/100BASE-T applications. |
| Automotive Body Control Modules | Medical Sensor Signal Conditioning |
Use Scenario: Guarding LIN bus transceivers, door lock actuators, and ambient light sensor inputs against load dump and ISO 7637-2 pulse 1/2a/3a transients. IC Role / Device Role / Timing Role: Bidirectional clamp on 12 V supply rails and unidirectional data lines where polarity reversal may occur during fault conditions. Use Value: 28 V VWM aligns with automotive 12 V nominal systems; 50.0 V clamping ensures MCU I/O stays within absolute maximum ratings during 100 V/50 ms transients. | Use Scenario: Safeguarding low-noise instrumentation amplifiers and ADC front-ends in portable diagnostic devices connected to patient-worn electrodes. IC Role / Device Role / Timing Role: Final-stage transient barrier before precision analog signal chain, placed after EMI filters and before active circuitry. Use Value: Sub-μA leakage preserves input bias current integrity; DO-214AC footprint allows compact layout near connectors without compromising creepage/clearance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CAHE3_A/H | Same VWM, VBR, VC, and DO-214AC package; differs only in tape-and-reel quantity (3000/reel vs. 2500/reel) and minor marking format. | No functional difference; identical electrical and thermal performance in PCB layout. | Select SMAJ28CE3/TR13 when sourcing from Microsemi's TR13-standard reels; choose SMAJ28CAHE3_A/H for alternate distribution channels requiring 3000-unit reels. |
| SMCJ28CA | Higher 1500 W PPP rating, larger DO-214AB (SMB) package, 53.3 V VC @ 28.3 A - not pin-compatible due to different footprint and thermal mass. | Used where higher surge energy (e.g., 10/1000 µs 20 A) must be absorbed without derating; requires PCB redesign. | Choose SMCJ28CA only if system-level testing confirms need for >500 W surge handling; otherwise SMAJ28CE3/TR13 offers optimal size/power balance. |
Compared with SMAJ28CAHE3_A/H, SMAJ28CE3/TR13 offers identical protection performance with standardized 2500-unit TR13 reels; versus SMCJ28CA, it trades higher surge capacity for smaller DO-214AC footprint and lower parasitic capacitance - critical for high-speed signal line integration.
Availability
SMAJ28CE3/TR13 is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, and automotive body control modules requiring stable component supply, RoHS compliance, and IEC61000-4-5 Class 4 surge immunity.
Supply support for SMAJ28CE3/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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMAJ series was engineered for cost-effective, surface-mount transient suppression in space-constrained designs - targeting applications where fast response, low leakage, and repeatable clamping are essential for protecting legacy and modern ICs alike.
FAQ
What does the "C" suffix in SMAJ28CE3/TR13 indicate?
The "C" suffix denotes bidirectional construction - meaning SMAJ28CE3/TR13 has symmetrical avalanche characteristics and protects both positive and negative transients without polarity dependence. This distinguishes it from unidirectional variants like SMAJ28A, which require correct orientation during placement and only clamp in one direction.
Is SMAJ28CE3/TR13 compliant with IEC61000-4-5 for lightning surge protection?
Yes, SMAJ28CE3/TR13 is validated for secondary lightning protection per IEC61000-4-5 with 12 Ω source impedance up to Class 4 (4 kV test level), and with 42 Ω source impedance up to Class 1. Its 50.0 V clamping voltage at 9.9 A ensures downstream circuitry remains within safe operating limits during standardized surge waveforms.
What is the maximum steady-state power dissipation of SMAJ28CE3/TR13 on a standard FR4 board?
SMAJ28CE3/TR13 dissipates up to 1.56 W continuously at 25 °C ambient temperature when mounted on FR4 with 1 oz copper and the recommended footprint. At 75 °C lead temperature (TL), its steady-state rating increases to 5 W - reflecting its thermal design for short-duration surges rather than continuous power handling.
Does SMAJ28CE3/TR13 require special PCB layout considerations?
Yes - SMAJ28CE3/TR13 should be placed as close as possible to the protected port with short, low-inductance traces to ground. The DO-214AC footprint requires adherence to Microsemi's specified pad dimensions (min/max per page 5), and thermal relief on ground pads should be minimized to maximize heat transfer during surge events.
Can SMAJ28CE3/TR13 replace SMAJ28A in an existing design?
No - SMAJ28CE3/TR13 is bidirectional while SMAJ28A is unidirectional; substituting them without circuit review risks improper clamping during negative transients or forward conduction in DC-biased paths. SMAJ28CE3/TR13 requires no polarity marking, whereas SMAJ28A relies on cathode band orientation - making direct replacement unsafe without schematic and layout verification.
SMAJ28CE3/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:
- 50V
- Current - Peak Pulse (10/1000µs):
- 9.9A
- 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)
SMAJ28CE3/TR13 FAQ
1.How can I place an order for SMAJ28CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CE3/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 SMAJ28CE3/TR13 reliable?
The price and inventory of SMAJ28CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ28CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CE3/TR13?
SMAJ28CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CE3/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 SMAJ28CE3/TR13?
For technical support, including SMAJ28CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ28CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ28CE3/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 SMAJ28CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ28CE3/TR13?
All SMAJ28CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CE3/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 SMAJ28CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ28CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28CE3/TR13 Tags
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