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Microchip Technology SMAJ75CAE3/TR13
- Part No.:
- SMAJ75CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CAE3/TR13.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,183
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Product details
Overview
SMAJ75CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in DC power rails and signal lines. It features a 75 V standoff voltage (VWM), 83.3 V minimum breakdown voltage (VBR), clamps transients to ≤134 V at 3.7 A peak pulse current (IPP), and delivers 500 W peak pulse power (10/1000 µs). It is used in industrial power supplies, telecom interfaces, and automotive control modules to protect MOSFETs, microcontrollers, and RS-485 transceivers.
For engineers reviewing the SMAJ75CAE3/TR13 datasheet, SMAJ75CAE3/TR13 pinout, SMAJ75CAE3/TR13 application, or SMAJ75CAE3/TR13 equivalent, key selection criteria include bidirectional clamping capability, IEC61000-4-2/4-4/4-5 compliance, DO-214AC package thermal performance, and RoHS-compliant matte-tin plating for lead-free assembly.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with clamping initiated when reverse or forward voltage exceeds ±83.3 V (VBR min), limiting transient energy to ≤134 V at 3.7 A. Its <100 ps theoretical response time enables effective suppression of ESD events per IEC61000-4-2 Level 4 (±15 kV contact).
It meets secondary lightning immunity per IEC61000-4-5 with 42 Ω source impedance (Class 1 up to 100 V standoff) and 12 Ω source impedance (Class 1 up to 30 V standoff); SMAJ75CAE3/TR13 falls within Class 1 for 42 Ω testing but not Class 1 for 12 Ω due to its 75 V rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 75 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR (min) | 83.3 V @ 1 mA - Minimum voltage at which avalanche breakdown begins in either polarity. |
| VC @ IPP | 134 V @ 3.7 A - Clamped voltage during 10/1000 µs surge, defining worst-case overvoltage seen by protected circuit. |
| PPP | 500 W - Peak transient power dissipation capability under standardized 10/1000 µs waveform. |
| ID @ VWM | 1 µA - Leakage current at rated standoff, ensuring minimal standby power loss and signal integrity. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 1.70–2.26 mm body width and wide leads for thermal dissipation. |
| RoHS | e3 suffix - Matte-tin plating compliant with EU RoHS Directive 2011/65/EU, suitable for Pb-free reflow. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case (UL94V-0), void-free construction, C-bend (modified J-bend) leads, matte-tin plating, cathode band omitted on bidirectional devices. Weight: 0.064 g. Moisture sensitivity level: Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional terminal pair | Identical electrical behavior in both directions; no polarity marking; connects across protected line and ground (or between differential lines). |
| Case | Non-electrical mechanical structure | Thermally conductive epoxy body aids heat transfer to PCB copper; no electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal paths (e.g., RS-485, CAN, Ethernet PHY) without polarity concerns. |
| 500 W peak pulse rating | Supports robust immunity against severe transients including IEC61000-4-5 lightning surges (42 Ω source, 1 kV–4 kV test levels). |
| Fast response (<100 ps theoretical) | Prevents voltage overshoot before protection activation, critical for safeguarding sub-10 ns edge-rate digital interfaces. |
| DO-214AC thermal design | Wide leads and low junction-to-lead thermal resistance (15 °C/W) enable sustained power handling on standard FR4 with 1 oz Cu. |
| RoHS-compliant e3 plating | Matte-tin finish ensures reliable solderability and intermetallic formation in Pb-free reflow profiles (260 °C/10 s max). |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between VIN and chassis ground to divert surge current away from upstream DC-DC converters and MCU power pins. Use Value: Limits transient voltage to ≤134 V, preventing damage to 36 V-rated input stages and meeting ISO 7637-2 Pulse 5a requirements. | Use Scenario: LIN bus physical layer interface subjected to ESD events and battery transients during vehicle assembly and service. IC Role / Device Role / Timing Role: Bidirectional TVS connected across LIN signal and ground to clamp both positive and negative fast transients without polarity constraints. Use Value: Provides IEC61000-4-2 ±15 kV contact ESD protection while maintaining signal integrity below 1 Mbps LIN timing budgets. |
| Telecom Data Line Surge Protection | Medical Equipment Signal Isolation Barrier |
Use Scenario: RS-485 communication port in remote telemetry units deployed near lightning-prone outdoor substations. IC Role / Device Role / Timing Role: Paired SMAJ75CAE3/TR13 devices (line-to-ground) on A/B differential pair to suppress common-mode surges induced by nearby strikes. Use Value: Withstands 4 kV IEC61000-4-5 (42 Ω source) common-mode surges, preserving data integrity and avoiding false triggering of fail-safe receivers. | Use Scenario: Analog sensor input stage in patient-monitoring equipment requiring reinforced isolation and low-leakage protection. IC Role / Device Role / Timing Role: Low-leakage (1 µA @ 75 V) bidirectional TVS placed at isolated side of optocoupler or digital isolator to prevent ESD-induced latch-up. Use Value: Prevents isolation barrier compromise during handling while adding <0.1 µA leakage error to 24-bit ADC front-end measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CA | Same VWM/VBR/VC, but 600 W PPP in DO-214AA (SMB) package; 20% larger footprint. | Higher power margin suits higher-energy environments (e.g., railway traction control); less space-constrained layouts. | Select SMBJ75CA when board area permits and >500 W surge margin is required; SMAJ75CAE3/TR13 preferred for compact industrial modules. |
| SMCJ75CA | Same VWM/VBR/VC, but 1500 W PPP in DO-214AB (SMC) package; 3× larger thermal mass. | Required for severe lightning zones (IEC61000-4-5 Class 3/4 with 12 Ω source); used in base station power entry. | Choose SMCJ75CA only where 1500 W rating is mandated; SMAJ75CAE3/TR13 balances cost, size, and 500 W capability for most industrial endpoints. |
Compared with SMBJ75CA and SMCJ75CA, SMAJ75CAE3/TR13 offers optimal footprint efficiency and cost for 500 W-class protection-ideal for space-limited designs where 600 W or 1500 W ratings are unnecessary overhead.
Availability
SMAJ75CAE3/TR13 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive electronics requiring stable component supply with RoHS-compliant manufacturing and tape-and-reel delivery.
Supply support for SMAJ75CAE3/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 ICs, RF solutions, and discrete protection devices for aerospace, defense, and industrial markets.
The SMAJ series was engineered for surface-mount transient suppression in space-constrained, high-reliability systems-emphasizing fast response, repeatable clamping, and robust thermal performance in DO-214AC packaging.
FAQ
What does the 'CA' suffix indicate in SMAJ75CAE3/TR13?
The 'CA' suffix in SMAJ75CAE3/TR13 denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMAJ75A), it has no polarity marking and functions identically across either terminal, making it ideal for AC-coupled or floating signal lines such as RS-485 or CAN bus interfaces.
Is SMAJ75CAE3/TR13 compatible with lead-free reflow processes?
Yes, SMAJ75CAE3/TR13 is fully compatible with lead-free reflow. The 'e3' suffix confirms RoHS-compliant matte-tin plating, qualified for peak temperatures up to 260 °C for 10 seconds per JEDEC J-STD-020. Its DO-214AC package withstands standard Pb-free thermal profiles without delamination or solder joint reliability issues.
What IEC standards does SMAJ75CAE3/TR13 meet for surge protection?
SMAJ75CAE3/TR13 meets IEC61000-4-2 (ESD ±15 kV contact), IEC61000-4-4 (EFT ±4 kV), and IEC61000-4-5 (lightning surge) with 42 Ω source impedance for Class 1 (up to 100 V standoff). It is not rated for Class 1 under 12 Ω source impedance (limited to ≤30 V standoff), as confirmed in Microsemi's application guidance for the SMAJ family.
How does the clamping voltage of SMAJ75CAE3/TR13 affect protected circuit design?
The clamping voltage (VC = 134 V @ 3.7 A) defines the maximum overvoltage imposed on downstream components during a surge. Designers must ensure all protected devices-including MOSFETs, regulators, and interface ICs-have absolute maximum voltage ratings exceeding 134 V. This value directly determines required voltage margins and influences placement proximity to sensitive nodes to minimize inductive voltage spikes.
Can SMAJ75CAE3/TR13 be used in place of a unidirectional TVS like SMAJ75A?
No-SMAJ75CAE3/TR13 is not a drop-in replacement for unidirectional SMAJ75A. While both share identical VWM, VBR, and VC, the CA variant lacks polarity marking and conducts in both directions. Substituting it for SMAJ75A in DC-coupled circuits may cause unintended conduction or grounding conflicts; use only where bidirectional protection is explicitly required.
SMAJ75CAE3/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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 4.1A
- 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)
SMAJ75CAE3/TR13 FAQ
1.How can I place an order for SMAJ75CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CAE3/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 SMAJ75CAE3/TR13 reliable?
The price and inventory of SMAJ75CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ75CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CAE3/TR13?
SMAJ75CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CAE3/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 SMAJ75CAE3/TR13?
For technical support, including SMAJ75CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ75CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ75CAE3/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 SMAJ75CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ75CAE3/TR13?
All SMAJ75CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CAE3/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 SMAJ75CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ75CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CAE3/TR13 Tags
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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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