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Microchip Technology SMAJ12AE3/TR13
- Part No.:
- SMAJ12AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12AE3/TR13.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,313
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Product details
Overview
SMAJ12AE3/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 12 V reverse standoff voltage (VWM), 13.3 V minimum breakdown voltage (VBR), 19.9 V maximum clamping voltage (VC) at 25.1 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform-used in industrial power supplies, automotive body control modules, and Ethernet PHY interfaces.
For engineers reviewing the SMAJ12AE3/TR13 datasheet, SMAJ12AE3/TR13 pinout, SMAJ12AE3/TR13 application, or SMAJ12AE3/TR13 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, IEC61000-4-5 secondary lightning compliance (Class 4 with 42 Ω source), unidirectional polarity marking, and RoHS-compliant matte-tin terminations on DO-214AC package.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, entering avalanche conduction when transient voltage exceeds its 13.3 V breakdown threshold. Its <100 ps theoretical response time enables effective suppression of ESD (IEC61000-4-2 Level 4) and EFT (IEC61000-4-4 Level 4) events before sensitive downstream circuitry is stressed.
The device is rated for 500 W peak pulse power at 25 °C with derating above 25 °C per published curve, and supports steady-state dissipation of 1.56 W at 25 °C ambient on FR4 with recommended footprint. Thermal resistance is 80 °C/W junction-to-ambient and 15 °C/W junction-to-lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous DC or RMS operating voltage before clamping begins |
| VBR min | 13.3 V @ 1 mA - Guaranteed avalanche onset voltage under specified test current |
| VC | 19.9 V @ 25.1 A - Maximum voltage seen by protected circuit during 10/1000 µs surge |
| PPP | 500 W - Peak transient power handling capability per standard 10/1000 µs waveform |
| IPP | 25.1 A - Corresponding peak current at VC, defining minimum surge current immunity |
| ID | 1 µA @ VWM - Leakage current level ensuring minimal standby power loss and signal integrity |
| Operating Temp | −65 °C to +150 °C - Full specification range for automotive under-hood and industrial environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case with cathode band marking; terminals feature RoHS-compliant annealed matte-tin plating solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line; conducts surge current to cathode during avalanche |
| Cathode | Ground/Return side | Marked with band; tied to system ground or low-impedance return path for clamping |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional operation | Enables polarity-specific protection on DC rails without reverse leakage concerns during normal operation |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with lead-free matte-tin plating and halogen-free epoxy |
| IEC61000-4-5 Class 4 compliance | Validated for secondary lightning surges up to 4 kV with 42 Ω source impedance |
| DO-214AC mechanical compatibility | Standardized footprint allows drop-in replacement with industry-common SMA packages |
| Moisture sensitivity Level 1 | No dry pack or baking required prior to reflow, reducing manufacturing overhead |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 12 V DC input rail in programmable logic controller (PLC) power stage exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive-going surges before they reach DC-DC converter ICs. Use Value: 19.9 V clamping voltage ensures protected buck controller (e.g., LM5017) remains below its 36 V abs max rating during 25.1 A transients. | Use Scenario: LIN bus transceiver power pin subjected to battery connection/disconnection spikes and alternator load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC supply line of LIN transceiver (e.g., TJA1020), referenced to vehicle ground. Use Value: 13.3 V breakdown and 19.9 V clamping provide 2.1 V margin above nominal 12 V battery, preventing latch-up during cold-crank conditions. |
| Ethernet PHY Interface Protection | POS Terminal Serial Port |
Use Scenario: 3.3 V auxiliary power rail feeding Ethernet PHY IC (e.g., DP83848) in industrial switch, subject to ESD and cable-induced surges. IC Role / Device Role / Timing Role: Secondary TVS on PHY VDDIO rail, coordinated with upstream common-mode choke and primary TVS on data lines. Use Value: 1 µA standby leakage preserves rail stability; fast <100 ps response prevents ESD damage to 100BASE-TX analog front-end. | Use Scenario: RS-232 interface on point-of-sale terminal exposed to user-handling ESD and AC-line coupled noise. IC Role / Device Role / Timing Role: Rail-to-rail unidirectional clamp on ±12 V charge-pump supply lines feeding MAX232-level translator. Use Value: 500 W rating handles multiple 8 kV contact ESD strikes per IEC61000-4-2 without degradation; DO-214AC footprint fits tight board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3/TR13 | Same electrical specs but with high-reliability screening per MIL-PRF-19500 JANTX; includes 100% temperature cycling and HTRB testing | Required for aerospace avionics where extended life testing and lot traceability are mandated | Select SMAJ12AHE3/TR13 only if JANTX qualification and full military screening are contractually required |
| SMBJ12A-E3/52 | Same VWM, VBR, VC, but in DO-214AA (SMB) package; 600 W rating, slightly higher thermal resistance (junction-to-ambient) | Used where higher pulse power margin is needed and PCB layout permits larger footprint | Choose SMBJ12A-E3/52 when 600 W headroom is critical and board space allows SMB outline |
Compared with SMAJ12AE3/TR13, SMAJ12AHE3/TR13 adds military-grade reliability screening without changing clamping behavior, while SMBJ12A-E3/52 trades compact DO-214AC size for higher 600 W pulse rating and larger DO-214AA footprint-both require no schematic change but may need layout revision.
Availability
SMAJ12AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and Ethernet PHY interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMAJ12AE3/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 developed for robust, surface-mount transient suppression in harsh environments-targeting applications where failure due to ESD, lightning, or switching surges must be eliminated without compromising board space or thermal performance.
FAQ
What is the clamping voltage of SMAJ12AE3/TR13 at its rated peak pulse current?
The SMAJ12AE3/TR13 has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated 25.1 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMAJ12AE3/TR13 unidirectional or bidirectional?
SMAJ12AE3/TR13 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" in its part number suffix. It conducts surge current only from anode to cathode and must be installed with the cathode band oriented toward ground or the lowest potential reference point in the circuit.
Does SMAJ12AE3/TR13 meet IEC61000-4-5 for lightning surge protection?
Yes, SMAJ12AE3/TR13 is certified for secondary lightning surge protection per IEC61000-4-5 with 42 Ω source impedance at Class 4 (4 kV test level). Its 19.9 V clamping voltage and 25.1 A IPP ensure compliance when used with appropriate PCB layout and grounding practices.
What is the package type and moisture sensitivity level of SMAJ12AE3/TR13?
SMAJ12AE3/TR13 uses the DO-214AC (SMA) surface-mount package and carries a moisture sensitivity level (MSL) of 1 per IPC/JEDEC J-STD-020B-meaning it can be stored indefinitely at ambient conditions and requires no baking or dry-pack handling prior to reflow soldering.
How does the "TR13" suffix affect the packaging and ordering of SMAJ12AE3/TR13?
The "TR13" suffix indicates tape-and-reel packaging per EIA-481-1-A standard on a 13-inch reel containing 2500 units. This format is optimized for automated SMT placement and ensures consistent orientation, static protection, and traceable lot control throughout high-volume manufacturing.
SMAJ12AE3/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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- 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)
SMAJ12AE3/TR13 FAQ
1.How can I place an order for SMAJ12AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12AE3/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 SMAJ12AE3/TR13 reliable?
The price and inventory of SMAJ12AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ12AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12AE3/TR13?
SMAJ12AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12AE3/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 SMAJ12AE3/TR13?
For technical support, including SMAJ12AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ12AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ12AE3/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 SMAJ12AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ12AE3/TR13?
All SMAJ12AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12AE3/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 SMAJ12AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ12AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12AE3/TR13 Tags
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