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Microchip Technology SMAJ7.5AE3/TR13
- Part No.:
- SMAJ7.5AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AE3/TR13.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,376
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Product details
Overview
SMAJ7.5AE3/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 7.5 V working peak standoff voltage (VWM), 8.33 V minimum breakdown voltage (VBR) at 1 mA, 12.9 V maximum clamping voltage (VC) at 38.8 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform-used in industrial power supply input stages, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMAJ7.5AE3/TR13 datasheet, SMAJ7.5AE3/TR13 pinout, SMAJ7.5AE3/TR13 application, or SMAJ7.5AE3/TR13 equivalent, key selection criteria include its 12.9 V clamping level at 38.8 A, unidirectional polarity with cathode band marking, DO-214AC (SMA) package compatibility, and IEC61000-4-2/4-4/4-5 compliance for ESD, EFT, and secondary lightning surge protection.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, conducting above its breakdown threshold to divert surge energy to ground while maintaining low clamping voltage across protected circuitry. Its <100 ps theoretical response time enables effective suppression of electrostatic discharge events and fast-rising switching transients.
The device is rated for -65°C to +150°C operating temperature, exhibits 100 μA maximum standby leakage at VWM, and delivers 500 W peak pulse power dissipation with 0.01% impulse repetition rate-supporting robust protection in high-reliability industrial and transportation systems without thermal runaway under repeated surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected line voltage. |
| VBR min @ IBR | 8.33 V @ 1 mA - Minimum voltage at which device enters avalanche breakdown; ensures reliable triggering above normal operating range. |
| VC @ IPP | 12.9 V @ 38.8 A - Maximum clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPP | 500 W - Peak pulse power handling capability; defines energy absorption capacity for transient events per IEC standards. |
| IPP | 38.8 A - Peak surge current supported at rated clamping voltage; correlates directly with system-level surge test levels (e.g., IEC61000-4-5 Class 3). |
| ID @ VWM | 100 μA - Reverse leakage current at standoff voltage; low value minimizes quiescent power loss and avoids false triggering. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case with RoHS-compliant matte-tin-plated C-bend leads; cathode indicated by band on body; moisture sensitivity level (MSL) 1, no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-impedance reference; completes shunt path for transient current during clamping. |
| Cathode | Protected line connection | Connected to line being protected (e.g., +12 V rail); polarity-sensitive-reverse connection disables protection. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2/4-4/4-5 compliance | Validated for ESD (±8 kV contact), EFT (±2 kV), and secondary lightning (42 Ω source, Class 3) protection without external circuitry. |
| Fast response time | <100 ps theoretical turn-on enables suppression of sub-nanosecond ESD events before sensitive CMOS inputs are damaged. |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating; compatible with lead-free reflow profiles up to 260 °C for 10 s. |
| Tape-and-reel packaging | TR13 variant supplied in 13-inch reels (2500 units/reel) per EIA-481-1-A; supports automated SMT placement with standard feeders. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between input rail and chassis ground to clamp transients exceeding 7.5 V. Use Value: Limits voltage to ≤12.9 V during 38.8 A surges, preventing damage to upstream rectifier diodes and downstream DC-DC controllers. |
Use Scenario: LIN bus transceiver power rail in door module subjected to battery disconnect transients and ESD from user interface buttons. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply line feeding LIN transceiver IC and microcontroller. Use Value: Clamps 10/1000 µs surges to 12.9 V within <100 ps, ensuring LIN communication remains functional after ±8 kV ESD events. |
| PoE-Powered Ethernet Interface | Medical Diagnostic Equipment Sensor Interface |
Use Scenario: 48 V DC input of IEEE 802.3af/at powered device (PD) front-end, subject to cable-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: First-stage protection on PSE-side DC input before DC-DC converter and PD controller IC. Use Value: Absorbs 500 W surges while holding clamping voltage below 13 V, protecting PoE interface ICs rated for 16 V absolute maximum. |
Use Scenario: Analog sensor signal line (e.g., thermistor or pressure transducer) in portable ultrasound unit connected to patient-facing probes. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on signal path to protect ADC input and op-amp front-end from ESD during probe handling. Use Value: Provides 12.9 V clamping with <100 ps response, preserving signal integrity while meeting IEC61000-4-2 Level 4 (±15 kV air) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5AHE3/TR13 | Same electrical specs but with enhanced screening per MIL-PRF-19500 JANTX; includes 100% temperature cycling (-55°C to +125°C, 10×) and HTRB testing. | Required for aerospace avionics and military-grade systems where extended reliability validation is mandated. | Select SMAJ7.5AHE3/TR13 only when qualification to MIL-PRF-19500 is contractually required; otherwise, SMAJ7.5AE3/TR13 meets commercial/industrial needs. |
| SMBJ7.5A-E3/52 | Same VWM, VBR, and VC, but in larger DO-214AA (SMB) package with 600 W PPP rating and higher IPP (43.5 A). | Better suited for higher-energy surge environments (e.g., outdoor telecom equipment) where PCB space allows larger footprint. | Choose SMBJ7.5A-E3/52 if surge test levels exceed IEC61000-4-5 Class 3 or if thermal margin must be increased beyond SMAJ7.5AE3/TR13's 15 °C/W junction-to-lead Rθ. |
Compared with SMAJ7.5AE3/TR13, SMAJ7.5AHE3/TR13 adds military-grade screening at higher cost and longer lead time, while SMBJ7.5A-E3/52 offers 20% higher peak power and thermal robustness in a larger package-neither is pin-compatible due to differing DO-214AC vs. DO-214AA footprints.
Availability
SMAJ7.5AE3/TR13 is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive body electronics, and PoE-powered network devices requiring stable component supply with full RoHS compliance and tape-and-reel delivery.
Supply support for SMAJ7.5AE3/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, communications, and industrial markets.
The SMAJ series was developed specifically for surface-mount transient suppression in space-constrained, high-surge environments-emphasizing fast response, repeatable clamping, and robust thermal performance in DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ7.5AE3/TR13 at its rated peak pulse current?
The SMAJ7.5AE3/TR13 has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated 38.8 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is measured per Microsemi's MSC0270A datasheet and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMAJ7.5AE3/TR13 unidirectional or bidirectional, and how is polarity identified?
SMAJ7.5AE3/TR13 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" in its part number. Polarity is marked by a cathode band on the device body; the banded end connects to the protected line (e.g., +12 V), while the anode connects to ground. Reversing this connection disables clamping functionality.
Does SMAJ7.5AE3/TR13 meet IEC61000-4-5 for lightning surge protection?
Yes, SMAJ7.5AE3/TR13 is rated for secondary lightning protection per IEC61000-4-5 with 42 Ω source impedance up to Class 3 (24 V standoff range), supporting 1 kV open-circuit voltage tests. Its 38.8 A IPP and 12.9 V VC ensure compliance when applied per recommended PCB layout and grounding practices.
What is the thermal resistance of SMAJ7.5AE3/TR13, and how does it affect layout design?
SMAJ7.5AE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 80 °C/W when mounted on FR4 with 1 oz copper and Microsemi's recommended footprint. To maintain reliability, PCB land patterns must follow the pad layout on page 5 of MSC0270A, including adequate copper pour for heat spreading.
Can SMAJ7.5AE3/TR13 be used in place of SMAJ7.5A without modification?
Yes-SMAJ7.5AE3/TR13 is functionally identical to SMAJ7.5A except for RoHS compliance ("e3" suffix) and tape-and-reel packaging ("TR13"). Electrical parameters, package dimensions, and pinout are identical; no PCB or schematic changes are needed when upgrading from non-RoHS SMAJ7.5A to SMAJ7.5AE3/TR13.
SMAJ7.5AE3/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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 38.8A
- 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)
SMAJ7.5AE3/TR13 FAQ
1.How can I place an order for SMAJ7.5AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AE3/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 SMAJ7.5AE3/TR13 reliable?
The price and inventory of SMAJ7.5AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AE3/TR13?
SMAJ7.5AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AE3/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 SMAJ7.5AE3/TR13?
For technical support, including SMAJ7.5AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ7.5AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AE3/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 SMAJ7.5AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AE3/TR13?
All SMAJ7.5AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AE3/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 SMAJ7.5AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ7.5AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5AE3/TR13 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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