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Microchip Technology SMAJ28AE3/TR13
- Part No.:
- SMAJ28AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28AE3/TR13.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,859
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Product details
Overview
SMAJ28AE3/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 28 V reverse standoff voltage (VWM), 31.1 V minimum breakdown voltage (VBR), 50.0 V maximum clamping voltage at 9.9 A peak pulse current, 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 SMAJ28AE3/TR13 datasheet, SMAJ28AE3/TR13 pinout, SMAJ28AE3/TR13 application, or SMAJ28AE3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 secondary lightning surge (42 Ω source), unidirectional polarity marking, RoHS-compliant matte-tin plating, and compatibility with standard DO-214AC footprint layouts on FR4 PCBs.
Technical Context
This TVS operates as a silicon avalanche diode with fast response (<100 ps theoretical turn-on time), optimized for clamping transient energy before sensitive downstream ICs experience overstress. Its unidirectional construction provides forward conduction capability (40 A peak surge, 3.5 V max forward voltage) while blocking reverse leakage below 1 μA at 28 V.
The device is rated for -65°C to +150°C operating temperature, exhibits 15°C/W junction-to-lead thermal resistance, and delivers stable clamping across repeated 0.01% duty-cycle surges - validated per IEC61000-4-2 (ESD), IEC61000-4-4 (EFT), and IEC61000-4-5 (lightning) immunity standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR min @ IBR | 31.1 V @ 1 mA - Minimum voltage at which avalanche breakdown initiates; ensures reliable triggering above normal operating margin. |
| VC @ IPP | 50.0 V @ 9.9 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress seen by downstream components. |
| PPP | 500 W - Peak pulse power handling capacity; determines survivability against standardized lightning transients. |
| ID @ VWM | <1 μA - Reverse standby leakage current; negligible loading on 28 V supply rail under normal operation. |
| TJ range | -65°C to +150°C - Full operational junction temperature range; supports under-hood automotive and industrial environments. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case with cathode band marking; moisture sensitivity level (MSL) 1, no dry pack required per J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to protected line's low-side or ground return path; enables 40 A half-sine surge conduction. |
| Cathode | Avalanche clamping terminal | Marked with band; connects to protected line's high-side; conducts surge current to ground when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant matte-tin plating | Meets IPC/JEDEC solderability requirements (MIL-STD-750, method 2026); supports lead-free reflow up to 260°C for 10 s. |
| DO-214AC footprint compatibility | Standardized pad layout per JEDEC MS-013; enables drop-in replacement with legacy SMAJ series and P6KE axial equivalents. |
| IEC61000-4-5 Class 4 compliance | Validated for secondary lightning protection with 12 Ω source impedance up to 24 A surge current (per spec table). |
| Low thermal resistance | 15°C/W junction-to-lead; enables efficient heat dissipation during repetitive transients without derating on FR4 boards. |
Applications
| Industrial PLC Analog Input Protection | Automotive Body Control Module Power Rail |
|---|---|
Use Scenario: Protects 24 V DC analog input channels (0–10 V, 4–20 mA) from induced switching transients in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground, clamping surges before precision op-amps and ADCs. Use Value: Limits transient voltage to ≤50.0 V, preventing latch-up or damage to 12-bit SAR ADCs and instrumentation amplifiers. |
Use Scenario: Shields 28 V battery-supplied microcontroller power domain from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device on main VDD rail upstream of LDO regulators and CAN transceivers. Use Value: Absorbs 500 W surges per ISO 7637-2 Pulse 5a, maintaining MCU operation during 120 V/50 ms events. |
| Telecom DC Power Feeder Protection | Medical Equipment Signal Line ESD Guarding |
Use Scenario: Safeguards -48 V DC power feeds in remote radio units against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-rail, cathode-to-ground to clamp negative-going transients. Use Value: Achieves <100 ps response, limiting voltage overshoot to 50.0 V during IEC61000-4-5 42 Ω tests. |
Use Scenario: Guards isolated RS-485 or USB data lines in diagnostic imaging systems against hospital-grade ESD events. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed inline with differential pairs, referenced to local ground. Use Value: Delivers <1 μA leakage at 28 V, preserving signal integrity without loading high-impedance sensor interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28AHE3/TR13 | Same electrical specs; enhanced reliability screening per MIL-PRF-19500 JANTX with HTRB and surge testing. | Required for avionics or military-grade designs needing extended temperature cycling (-55°C to +125°C, 10×). | Select SMAJ28AHE3/TR13 only if qualification to MIL-PRF-19500 is mandatory; otherwise SMAJ28AE3/TR13 suffices for commercial/industrial use. |
| SMBJ28A-E3/52 | Lower 400 W peak power rating; identical VWM, VBR, and VC; SMB package (smaller footprint, higher thermal resistance). | Used where board space is constrained but surge energy is limited to ≤400 W (e.g., consumer IoT gateways). | Choose SMBJ28A-E3/52 only if 400 W rating meets system-level surge test requirements and PCB layout favors SMB size. |
Compared with SMAJ28AE3/TR13, SMAJ28AHE3/TR13 adds military-grade screening without altering clamping behavior, while SMBJ28A-E3/52 trades 20% lower surge capacity for 30% smaller footprint - both require validation against actual system-level IEC61000-4-5 test profiles.
Availability
SMAJ28AE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive body control module power rails, and telecom DC feeder protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ28AE3/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 transient suppression in harsh environments - delivering consistent 500 W surge handling, low clamping voltage, and long-term stability under thermal cycling and humidity exposure.
FAQ
What is the clamping voltage of SMAJ28AE3/TR13 at its rated peak pulse current?
The SMAJ28AE3/TR13 has a maximum clamping voltage (VC) of 50.0 V at 9.9 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured with the device mounted on a FR4 PCB using the recommended footprint per Microsemi's datasheet.
Is SMAJ28AE3/TR13 unidirectional or bidirectional, and how is polarity indicated?
SMAJ28AE3/TR13 is a unidirectional TVS diode, with polarity marked by a cathode band on the package body. The cathode terminal connects to the protected line, and the anode connects to ground or the return path. Bidirectional variants carry a "C" or "CA" suffix (e.g., SMAJ28CA), which SMAJ28AE3/TR13 does not have.
Does SMAJ28AE3/TR13 meet IEC61000-4-5 for secondary lightning protection?
Yes, SMAJ28AE3/TR13 is validated for IEC61000-4-5 secondary lightning protection with both 42 Ω and 12 Ω source impedances. Per Microsemi's datasheet, it qualifies for Class 4 (12 Ω source) up to 24 A peak current and Class 1 (42 Ω source) up to 100 A - confirming suitability for telecom and industrial surge immunity testing.
What is the maximum steady-state power dissipation of SMAJ28AE3/TR13 on a standard FR4 board?
When mounted on a FR4 PCB with 1 oz copper and Microsemi's recommended footprint, SMAJ28AE3/TR13 dissipates up to 1.56 W at ambient temperature (TA = 25°C) and 5 W at lead temperature (TL = 75°C). These ratings reflect thermal limits for continuous DC operation, distinct from its 500 W transient capability.
Can SMAJ28AE3/TR13 be used in lead-free reflow processes?
Yes, SMAJ28AE3/TR13 features RoHS-compliant annealed matte-tin plating and is qualified for lead-free reflow soldering at 260°C for up to 10 seconds, per MIL-STD-750 method 2026. Its DO-214AC package and MSL Level 1 rating eliminate dry-pack requirements, simplifying manufacturing logistics.
SMAJ28AE3/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):
- 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)
SMAJ28AE3/TR13 FAQ
1.How can I place an order for SMAJ28AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28AE3/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 SMAJ28AE3/TR13 reliable?
The price and inventory of SMAJ28AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ28AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28AE3/TR13?
SMAJ28AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28AE3/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 SMAJ28AE3/TR13?
For technical support, including SMAJ28AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ28AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ28AE3/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 SMAJ28AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ28AE3/TR13?
All SMAJ28AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28AE3/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 SMAJ28AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ28AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28AE3/TR13 Tags
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