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Microchip Technology SMAJ45E3/TR13
- Part No.:
- SMAJ45E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45E3/TR13.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,206
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Product details
Overview
SMAJ45E3/TR13 from Microsemi is a unidirectional 500 W surface-mount Transient Voltage Suppressor (TVS) with 45 V standoff voltage (VWM), 50.0 V minimum breakdown voltage (VBR), and 80.3 V maximum clamping voltage (VC) at 6.2 A peak pulse current. It protects ICs, MOSFETs, and logic circuits in DC power rails and I/O lines against ESD per IEC61000-4-2 and lightning-induced surges per IEC61000-4-5.
For engineers reviewing the SMAJ45E3/TR13 datasheet, SMAJ45E3/TR13 pinout, SMAJ45E3/TR13 application, or SMAJ45E3/TR13 equivalent, key selection criteria include clamping performance under 10/1000 µs transients, thermal resistance (15 °C/W junction-to-lead), RoHS-compliant matte-tin plating, and compatibility with automated SMT assembly using EIA-481-1-A tape-and-reel packaging.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds 50.0 V (VBR min @ 1 mA), limiting transient energy to 500 W for 10/1000 µs pulses. Its <100 ps theoretical response time enables effective suppression of electrostatic discharge events before sensitive downstream circuitry sustains damage.
The device uses a DO-214AC (SMA) package with C-bend leads, rated for -65 °C to +150 °C operating temperature and 260 °C soldering (10 s). Thermal resistance is specified at 15 °C/W junction-to-lead and 80 °C/W junction-to-ambient on FR4 with recommended footprint, supporting reliable power dissipation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping begins; sets safe operating margin for 36–42 V nominal DC rails. |
| VBR min | 50.0 V @ 1 mA - Minimum breakdown threshold ensures consistent turn-on across temperature and unit variation. |
| VC @ IPP | 80.3 V @ 6.2 A - Clamping voltage during 10/1000 µs surge defines worst-case overvoltage seen by protected circuitry. |
| PPP | 500 W - Peak pulse power rating determines survivability of standardized lightning and EFT waveforms. |
| ID @ VWM | 1 µA - Ultra-low leakage current minimizes standby power loss and avoids false triggering in high-impedance sensing paths. |
| tclamp | <100 ps - Theoretical response time enables protection against sub-nanosecond ESD events per IEC61000-4-2 Level 4. |
| TJ range | -65 °C to +150 °C - Wide junction temperature range supports operation in automotive engine compartments and industrial enclosures. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy body (UL94V-0), matte-tin-plated C-bend leads. Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-impedance return plane; must handle full 6.2 A surge current without trace heating. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 45 V supply rail); polarity marking ensures correct orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; no dry pack required prior to reflow. |
| 500 W peak pulse rating | Supports IEC61000-4-5 Class 4 secondary lightning protection (12 Ω source) up to 45 V systems. |
| Unidirectional configuration | Enables precise clamping on positive-rail applications without forward conduction during normal operation. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A standard; compatible with high-speed pick-and-place equipment. |
| Low thermal resistance | 15 °C/W junction-to-lead allows efficient heat transfer to PCB copper, sustaining repeated surge events without derating. |
Applications
| Industrial Power Supply Input | Automotive Body Control Module |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp induced surges before they reach upstream rectifier and regulator ICs. Use Value: 80.3 V clamping voltage ensures downstream 100 V-rated input capacitors and bridge rectifiers remain within safe operating area during 100 V/50 ms load dump events. |
Use Scenario: CAN bus power line (VCC) in BCM subjected to battery disconnect transients and ESD from service port connections. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V auxiliary rail protecting CAN transceiver power pins and microcontroller LDO inputs. Use Value: 1 µA standby leakage prevents measurable drain on vehicle battery during extended parking; 500 W rating handles ISO 16750-2 Pulse 5a/b surges. |
| Telecom Remote Radio Unit | Medical Diagnostic Imaging Interface |
Use Scenario: 48 V PoE-powered remote radio unit mounted on cell tower, subject to induced lightning surges on DC feed line. IC Role / Device Role / Timing Role: Primary-level TVS on DC input before DC-DC converters, coordinated with secondary-side TVS for staged protection. Use Value: 45 V VWM matches IEEE 802.3bt Type 4 PoE+ nominal voltage; DO-214AC footprint enables dense layout with minimal parasitic inductance. |
Use Scenario: Signal conditioning board in MRI console with analog sensor inputs routed near high-current gradient coils. IC Role / Device Role / Timing Role: TVS on ±15 V analog supply rails to suppress RF-coupled transients from gradient switching noise. Use Value: Sub-100 ps response time prevents nanosecond-scale RF bursts from coupling into precision ADC front-ends, preserving SNR in low-level signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A | Same VWM, VBR, VC, and PPP; non-RoHS tin-lead plating; no "e3" suffix. | Limited to non-RoHS production environments; not compliant with EU WEEE/RoHS directives. | Select SMAJ45A only if legacy tin-lead assembly process is mandated and environmental compliance is not required. |
| SMAJ45CA | Bidirectional variant; same VWM but symmetric clamping in both polarities; capacitance ~½ that of unidirectional at 0 V. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, USB D+/D−); unsuitable for DC rail protection. | Choose SMAJ45CA only when protecting bidirectional data lines; SMAJ45E3/TR13 remains optimal for unidirectional DC power rails. |
Compared with SMAJ45A and SMAJ45CA, the SMAJ45E3/TR13 provides RoHS-compliant matte-tin termination and unidirectional clamping optimized for 45 V DC power rails-making it the preferred choice for modern SMT production targeting industrial and automotive standards.
Availability
SMAJ45E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and medical diagnostic imaging interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ45E3/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial applications, emphasizing ruggedness and long-term support.
The SMAJ series targets surface-mount transient suppression in harsh environments, with design focus on fast response, high surge capability, and robust thermal performance in compact DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ45E3/TR13 under a 10/1000 µs surge?
The SMAJ45E3/TR13 has a maximum clamping voltage (VC) of 80.3 V at 6.2 A peak pulse current (IPP) for a 10/1000 µs waveform. This value is measured per Figure 2 in the official Microsemi datasheet MSC0270A and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is SMAJ45E3/TR13 RoHS compliant and what does the "e3" suffix indicate?
Yes, SMAJ45E3/TR13 is RoHS compliant-the "e3" suffix denotes annealed matte-tin plating per JEDEC J-STD-020B Level 1 moisture sensitivity, eliminating the need for dry packing prior to reflow. This ensures compatibility with lead-free assembly processes while maintaining solderability and long-term reliability.
Can SMAJ45E3/TR13 be used for bidirectional signal line protection?
No, SMAJ45E3/TR13 is a unidirectional TVS diode and must not be used on AC or bidirectional lines. For such applications, the SMAJ45CA variant is specified-its symmetrical breakdown and clamping behavior in both polarities makes it suitable for RS-485, CAN, or USB data lines where voltage swings occur above and below ground.
What is the thermal resistance specification for SMAJ45E3/TR13 and how does it affect PCB layout?
SMAJ45E3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and junction-to-ambient of 80 °C/W on FR4 with recommended footprint. To achieve rated 500 W surge capability, the PCB must provide adequate copper area (per datasheet pad layout) and low-thermal-resistance paths to ground planes-undersized traces will cause localized overheating and premature failure.
How does SMAJ45E3/TR13 compare to SMAJ45A in terms of electrical performance and compliance?
SMAJ45E3/TR13 and SMAJ45A share identical electrical parameters-including VWM = 45 V, VBR min = 50.0 V, and VC = 80.3 V-but differ in plating: SMAJ45E3/TR13 uses RoHS-compliant matte-tin ("e3"), whereas SMAJ45A uses tin-lead. The "TR13" suffix confirms 2500-unit tape-and-reel packaging per EIA-481-1-A, unlike bulk or different reel options.
SMAJ45E3/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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
SMAJ45E3/TR13 FAQ
1.How can I place an order for SMAJ45E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45E3/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 SMAJ45E3/TR13 reliable?
The price and inventory of SMAJ45E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ45E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45E3/TR13?
SMAJ45E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45E3/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 SMAJ45E3/TR13?
For technical support, including SMAJ45E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45E3/TR13 requirements.
6.How does Aetrix verify that SMAJ45E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ45E3/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 SMAJ45E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ45E3/TR13?
All SMAJ45E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45E3/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 SMAJ45E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ45E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45E3/TR13 Tags
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