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Microchip Technology SMAJ75E3/TR13
- Part No.:
- SMAJ75E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75E3/TR13.pdf
- Description:
- TVS DIODE 75VWM 134VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,463
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Product details
Overview
SMAJ75E3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for 75 V standoff protection in DC power rails and signal lines. It delivers 500 W peak pulse power at 10/1000 µs, clamps transients to ≤134 V at 3.7 A peak pulse current, and operates from –65 °C to +150 °C - ideal for industrial power supply input protection against ESD, EFT, and secondary lightning surges per IEC61000-4-2/4-4/4-5.
For engineers reviewing the SMAJ75E3/TR13 datasheet, SMAJ75E3/TR13 pinout, SMAJ75E3/TR13 application, or SMAJ75E3/TR13 equivalent, key selection criteria include its 75 V working voltage, 134 V max clamping voltage at 3.7 A, RoHS-compliant matte-tin plating, DO-214AC package with cathode band marking, and tape-and-reel packaging (TR13 = 2500/reel).
Technical Context
This unidirectional TVS diode uses silicon avalanche junction technology to provide sub-nanosecond response (<100 ps theoretical) and low clamping ratio (VC/VBR ≈ 1.60). Its 15 °C/W junction-to-lead thermal resistance enables reliable 5 W steady-state dissipation at 75 °C lead temperature when mounted on FR4 with recommended footprint.
It meets IEC61000-4-5 secondary lightning protection up to Class 4 (12 Ω source) and Class 1 (42 Ω source), with bidirectional variants (e.g., SMAJ75CA) available for AC-coupled or symmetrical line protection - though SMAJ75E3/TR13 itself is strictly unidirectional.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 75 V - maximum continuous reverse voltage before leakage exceeds 1 μA; sets operating margin for 48–60 V DC systems. |
| VBR min @ I(BR) | 83.3 V @ 1 mA - guaranteed avalanche onset threshold; ensures predictable turn-on during overvoltage events. |
| VC @ IPP | 134 V @ 3.7 A - clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPP (Peak Pulse Power) | 500 W @ 10/1000 µs - standardized surge energy handling capacity; validated per Figure 2 of MSC0270A Rev L. |
| ID @ VWM | ≤1 μA - ultra-low standby leakage; avoids measurable power loss in battery-backed or high-impedance circuits. |
| Operating Temp | –65 °C to +150 °C - supports under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | DO-214AC (SMAJ) - industry-standard surface-mount outline with wide leads for thermal and mechanical robustness. |
Pinout & Package
DO-214AC (SMAJ) package: molded thermosetting epoxy body (UL94V-0), C-bend leads with RoHS-compliant matte-tin plating, cathode indicated by band. Weight: 0.064 g. Moisture sensitivity level: Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection | Connected to ground or return path; carries full surge current during clamping. |
| Cathode | High-side connection | Connected to protected line (e.g., +48 V rail); marked by band; blocks reverse current until breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W surge rating | Validated at 10/1000 µs waveform - sufficient for IEC61000-4-5 Class 1 (42 Ω) and Class 4 (12 Ω) lightning testing. |
| RoHS-compliant "e3" suffix | Matte-tin plating per MIL-STD-750 Method 2026 - ensures solderability and eliminates lead-based finishes. |
| Tape-and-reel packaging | TR13 = 2500 units per 13-inch reel per EIA-481-1-A - optimized for automated SMT placement. |
| Ultra-fast response | <100 ps theoretical turn-on - faster than most microcontrollers and interface ICs can react, enabling pre-emptive protection. |
| Low thermal resistance | 15 °C/W junction-to-lead - enables sustained 5 W dissipation at TL = 75 °C without derating on standard FR4 layouts. |
Applications
| Industrial Power Input Protection | Telecom DC Distribution |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +48 V rail and chassis ground to clamp positive surges before they reach DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤134 V, preventing damage to 3.3 V/5 V logic supplies and ensuring system-level immunity to IEC61000-4-4 EFT bursts. | Use Scenario: -48 V DC feed in central office line card where induced RF and lightning-induced surges threaten Ethernet PHYs and management controllers. IC Role / Device Role / Timing Role: Cathode tied to -48 V rail, anode to ground - clamps negative-going transients on the return path while blocking normal reverse bias. Use Value: Withstand 3.7 A peak pulses without degradation, maintaining <1 μA leakage to avoid affecting -48 V regulation accuracy. |
| Automotive Body Control Module | Medical Equipment Power Entry |
Use Scenario: 12 V auxiliary supply line in BCM subjected to ISO 7637-2 pulse 1 (inductive load dump) and pulse 2a (alternator load dump). IC Role / Device Role / Timing Role: TVS installed across input capacitor to absorb 500 W surges within nanoseconds, protecting CAN transceivers and MCU I/O. Use Value: Clamping voltage of 134 V stays well below 150 V absolute maximum ratings of common automotive-grade regulators and drivers. | Use Scenario: Mains-derived 24 V DC power entry in diagnostic imaging device requiring >10-year field reliability and zero risk of false triggering. IC Role / Device Role / Timing Role: Primary overvoltage clamp on isolated DC output, coordinated with upstream fuses and secondary crowbar circuits. Use Value: 1 μA max ID at 75 V ensures no measurable drift in precision analog front-end references over decades of operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | No "e3" RoHS suffix; tin-lead plating; same electrical specs and DO-214AC package. | Not suitable for RoHS-compliant production; requires leaded solder process. | Select SMAJ75A only for legacy repair or non-RoHS environments where tin-lead assembly is mandated. |
| SMAJ75CA | Bidirectional variant; symmetric clamping (±134 V); same VWM, VC, and PPP ratings. | Required for AC-coupled data lines (e.g., RS-485) or dual-polarity rails where negative transients dominate. | Choose SMAJ75CA instead of SMAJ75E3/TR13 only when protecting balanced or AC signals - not for unidirectional DC rails. |
Compared with SMAJ75A and SMAJ75CA, SMAJ75E3/TR13 provides RoHS compliance and automated SMT readiness out-of-box, while retaining identical surge performance and thermal behavior - making it optimal for new industrial and telecom designs requiring lead-free manufacturing and high-volume placement.
Availability
SMAJ75E3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, telecom DC distribution, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ75E3/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 ruggedized transient suppression in harsh environments - emphasizing low clamping ratio, high surge endurance, and extended temperature operation beyond commercial grade.
FAQ
What is the clamping voltage of SMAJ75E3/TR13 at its rated peak pulse current?
The SMAJ75E3/TR13 has a maximum clamping voltage (VC) of 134 V at 3.7 A peak pulse current (IPP), measured under the standard 10/1000 µs waveform. This value is guaranteed per Microsemi's MSC0270A Rev L datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMAJ75E3/TR13 unidirectional or bidirectional?
SMAJ75E3/TR13 is a unidirectional transient voltage suppressor. Its cathode is marked by a band, and it conducts only during positive overvoltage conditions on the cathode side relative to anode (ground). Bidirectional versions carry a "C" or "CA" suffix (e.g., SMAJ75CA); SMAJ75E3/TR13 does not support symmetrical AC surge suppression.
What does the "TR13" suffix mean in SMAJ75E3/TR13?
The "TR13" suffix indicates tape-and-reel packaging: 2500 units per 13-inch reel, compliant with EIA-481-1-A standards. This format enables high-speed pick-and-place assembly in automated SMT lines. The "e3" portion confirms RoHS-compliant matte-tin plating, distinguishing it from legacy tin-lead variants like SMAJ75A.
Can SMAJ75E3/TR13 be used for IEC61000-4-5 lightning surge protection?
Yes - SMAJ75E3/TR13 is rated for secondary lightning protection per IEC61000-4-5 with both 12 Ω and 42 Ω source impedances. It meets Class 4 (12 Ω) and Class 1 (42 Ω) requirements, delivering 500 W peak pulse power at 10/1000 µs. Its 134 V clamping voltage ensures protected circuits see minimal overvoltage during standardized surge tests.
What is the thermal resistance and steady-state power rating of SMAJ75E3/TR13?
SMAJ75E3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and a steady-state power dissipation rating of 5 W at 75 °C lead temperature (TL), or 1.56 W at 25 °C ambient (TA) on FR4 with recommended footprint. These values are defined in the Maximum Ratings table of the MSC0270A datasheet and guide heatsinking and layout decisions for continuous overvoltage scenarios.
SMAJ75E3/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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 3.7A
- 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)
SMAJ75E3/TR13 FAQ
1.How can I place an order for SMAJ75E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75E3/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 SMAJ75E3/TR13 reliable?
The price and inventory of SMAJ75E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ75E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75E3/TR13?
SMAJ75E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75E3/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 SMAJ75E3/TR13?
For technical support, including SMAJ75E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75E3/TR13 requirements.
6.How does Aetrix verify that SMAJ75E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ75E3/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 SMAJ75E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ75E3/TR13?
All SMAJ75E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75E3/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 SMAJ75E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ75E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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