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Microchip Technology SMAJ70E3/TR13
- Part No.:
- SMAJ70E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70E3/TR13.pdf
- Description:
- TVS DIODE 70VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,446
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Product details
Overview
SMAJ70E3/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 70 V reverse standoff voltage (VWM), 77.8 V minimum breakdown voltage (VBR), clamps transients to ≤125 V at 4.0 A peak pulse current, and delivers 500 W peak pulse power per 10/1000 µs waveform - used in industrial power supply input stages and telecom interface protection.
For engineers reviewing the SMAJ70E3/TR13 datasheet, SMAJ70E3/TR13 pinout, SMAJ70E3/TR13 application, or SMAJ70E3/TR13 equivalent, key selection criteria include its RoHS-compliant "e3" termination, TR13 tape-and-reel packaging (2500 units/reel), DO-214AC 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 unidirectional clamping device with cathode-band polarity marking, optimized for fast transient response (<100 ps theoretical turn-on). Its junction-to-lead thermal resistance is 15 °C/W, enabling reliable operation up to +150 °C ambient when mounted on FR4 with recommended footprint.
The SMAJ70E3/TR13 meets IEC61000-4-5 Class 1 (42 Ω source) and Class 2 (12 Ω source) secondary lightning protection requirements, and supports steady-state dissipation of 1.56 W at 25 °C ambient or 5 W at 75 °C lead temperature - critical for sustained surge duty cycles in industrial control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous DC or RMS operating voltage before clamping begins; sets safe margin above nominal 48–60 V rail systems. |
| VBR min @ IBR | 77.8 V @ 1 mA - Confirmed breakdown threshold ensures predictable activation during overvoltage events without premature conduction. |
| VC @ IPP | 125 V @ 4.0 A - Clamping voltage limits downstream component stress during 10/1000 µs surges; enables robust protection of 100 V-rated ICs. |
| PPP | 500 W - Peak pulse power rating defines maximum transient energy absorption capability under standardized surge conditions. |
| ID @ VWM | 1 μA - Ultra-low leakage current minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with wide leads for low thermal resistance (15 °C/W) and mechanical reliability. |
| RoHS | e3 suffix - Matte-tin plating compliant with EU RoHS Directive 2011/65/EU; no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case (UL94V-0), C-bend leads, cathode indicated by band. Weight: 0.064 g. Moisture sensitivity level: Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., +48 V rail); conducts surge current toward cathode during overvoltage. |
| Cathode | Ground/Return side | Connected to system ground or low-impedance return path; provides low-resistance surge shunt path to earth reference. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Supports high-energy transients in industrial motor drives and PoE-powered equipment without thermal runaway. |
| 100% screening option (MA prefix) | Enables avionics-grade qualification including -55°C to +125°C temperature cycling (10×) and HTRB testing. |
| IEC61000-4-5 Class 1 & 2 compliance | Validated for secondary lightning protection in telecom base stations and outdoor Ethernet switches with 42 Ω and 12 Ω source impedances. |
| Fast response time | <100 ps theoretical turn-on ensures suppression before sensitive logic or analog circuitry sustains damage from ESD or switching spikes. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel enables automated SMT placement with traceable lot control and zero manual handling. |
Applications
| Industrial Power Input Protection | Telecom Interface Surge Guard |
|---|---|
Use Scenario: 48 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 TVS clamping device placed between input rail and chassis ground. Use Value: Limits transient voltage to ≤125 V, protecting downstream DC-DC converters and microcontroller power pins rated for 100 V absolute maximum. |
Use Scenario: RS-485 data line in outdoor cellular backhaul unit subjected to induced lightning surges. IC Role / Device Role / Timing Role: Line-side transient suppressor on differential pair, referenced to local ground plane. Use Value: Absorbs 500 W surges per IEC61000-4-5 (42 Ω source), maintaining signal integrity and preventing receiver IC latch-up. |
| Automotive Body Control Module | Medical Equipment AC/DC Adapter Input |
Use Scenario: 12 V battery-supplied body control module encountering ISO 7637-2 pulse 1 (inductive switch-off) and pulse 2a (load dump). IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power feed, upstream of LDO regulators. Use Value: Withstands 40 A forward surge (8.3 ms half-sine) and clamps to 125 V, preserving 16 V-rated power management ICs. |
Use Scenario: Secondary-side DC output of medical-grade AC/DC adapter powering isolated patient-monitoring sensors. IC Role / Device Role / Timing Role: Final-stage transient guard before low-noise analog front-end circuitry. Use Value: Sub-1 μA leakage prevents offset drift in precision instrumentation amplifiers; RoHS e3 finish ensures biocompatibility compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A | No "e3" RoHS suffix; SnPb plating; same electrical specs and DO-214AC package. | Not suitable for new RoHS-compliant designs; requires exemption documentation for legacy repair. | Select SMAJ70A only if SnPb assembly process is mandated and lead-free plating is prohibited. |
| SMBJ70A | Lower 600 W peak power rating; SMB (DO-214AA) package with higher thermal resistance (20 °C/W junction-to-lead). | Less effective in high-duty-cycle surge environments; requires larger PCB copper area for thermal management. | Choose SMBJ70A only when board space constraints prevent SMA footprint use and 600 W rating suffices. |
Compared with SMAJ70A and SMBJ70A, the SMAJ70E3/TR13 uniquely combines RoHS-compliant matte-tin termination, industry-standard DO-214AC thermal performance (15 °C/W), and verified IEC61000-4-5 Class 1/2 compliance - making it optimal for volume production of certified industrial and telecom equipment.
Availability
SMAJ70E3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, telecom interface surge guard, and automotive body control module applications requiring stable component supply, full RoHS compliance, and traceable tape-and-reel logistics.
Supply support for SMAJ70E3/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 robust, surface-mount transient suppression in harsh environments - targeting applications where failure modes must be mitigated without compromising long-term reliability or regulatory compliance.
FAQ
What is the clamping voltage of SMAJ70E3/TR13 at its rated peak pulse current?
The SMAJ70E3/TR13 has a maximum clamping voltage (VC) of 125 V at 4.0 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is measured and guaranteed per Microsemi's MSC0270A datasheet Rev L, ensuring predictable voltage limiting during surge events without exceeding downstream component ratings.
Is SMAJ70E3/TR13 unidirectional or bidirectional?
SMAJ70E3/TR13 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" in its part number. It features a cathode band marking and conducts surge current only from anode to cathode - appropriate for DC rail protection where polarity is fixed and reverse-voltage blocking is required.
What does the "e3" suffix mean in SMAJ70E3/TR13?
The "e3" suffix in SMAJ70E3/TR13 denotes RoHS-compliant matte-tin plating on the leads, conforming to EU Directive 2011/65/EU. It replaces traditional SnPb finishes and is verified per IPC/JEDEC J-STD-020B moisture classification Level 1, eliminating dry-pack requirements for storage and handling.
What is the thermal resistance of SMAJ70E3/TR13, and how does it affect layout?
SMAJ70E3/TR13 has a junction-to-lead thermal resistance of 15 °C/W. To maintain reliability under repeated surges, the PCB footprint must follow Microsemi's recommended pad layout (Page 5 of MSC0270A), using ≥1 oz copper and thermal vias to minimize temperature rise - especially critical when operating near its 5 W steady-state limit at 75 °C lead temperature.
Does SMAJ70E3/TR13 meet IEC61000-4-5 for lightning surge protection?
Yes, SMAJ70E3/TR13 is validated for IEC61000-4-5 secondary lightning protection: Class 1 with 42 Ω source impedance (covers SMAJ5.0–SMAJ100A range) and Class 2 with 12 Ω source impedance (covers SMAJ5.0–SMAJ30A range). Its 500 W rating and 125 V clamping ensure compliance across both test configurations.
SMAJ70E3/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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4A
- 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)
SMAJ70E3/TR13 FAQ
1.How can I place an order for SMAJ70E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70E3/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 SMAJ70E3/TR13 reliable?
The price and inventory of SMAJ70E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ70E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70E3/TR13?
SMAJ70E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70E3/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 SMAJ70E3/TR13?
For technical support, including SMAJ70E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70E3/TR13 requirements.
6.How does Aetrix verify that SMAJ70E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ70E3/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 SMAJ70E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ70E3/TR13?
All SMAJ70E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70E3/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 SMAJ70E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ70E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70E3/TR13 Tags
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