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Microchip Technology SMAJ40CE3/TR13
- Part No.:
- SMAJ40CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CE3/TR13.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ40CE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for robust ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 40 V reverse standoff voltage (VWM), 44.4 V minimum breakdown voltage (VBR), clamps transients to ≤71.4 V at 7.0 A peak pulse current (IPP), and delivers 500 W peak pulse power (10/1000 µs). It is deployed in industrial I/O modules, telecom interface circuits, and automotive body control units requiring RoHS-compliant, high-reliability overvoltage protection.
For engineers reviewing the SMAJ40CE3/TR13 datasheet, SMAJ40CE3/TR13 pinout, SMAJ40CE3/TR13 application, or SMAJ40CE3/TR13 equivalent, key selection criteria include its bidirectional configuration, DO-214AC package compatibility, IEC61000-4-2/4-4/4-5 compliance, low standby leakage (<1 µA @ 40 V), and tape-and-reel packaging (TR13 = 2500 pcs/reel) for automated assembly.
Technical Context
This device operates as a voltage-clamping avalanche diode with symmetrical bidirectional conduction-no polarity marking required. Its sub-5 ns response time enables effective suppression of fast transients including ESD (±8 kV contact, ±15 kV air per IEC61000-4-2) and electrical fast transients (EFT, 4 kV per IEC61000-4-4).
Rated for 500 W peak pulse power at 10/1000 µs waveform, it sustains 1.56 W steady-state dissipation at 25 °C ambient on FR4 board and exhibits thermal resistance of 80 °C/W junction-to-ambient. The device is qualified to -65 °C to +150 °C operating temperature range and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines safe operating margin before breakdown. |
| VBR min @ IBR | 44.4 V @ 1 mA - Minimum voltage at which avalanche conduction begins; ensures predictable turn-on threshold across production lots. |
| VC @ IPP | 71.4 V @ 7.0 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream circuitry. |
| PPP | 500 W - Peak transient power handling capability; supports high-energy surges common in industrial and automotive environments. |
| ID @ VWM | <1 µA - Ultra-low leakage current at rated standoff voltage; prevents unwanted loading of high-impedance sensor or reference circuits. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with wide leads for enhanced thermal dissipation and mechanical reliability in reflow assembly. |
| Compliance | RoHS-compliant "e3" finish - Lead-free matte tin plating per MIL-STD-750 Method 2026; compatible with Pb-free soldering processes up to 260 °C for 10 s. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case (UL94V-0), C-bend (modified J-bend) leads, cathode band omitted for bidirectional devices. Dimensions: 4.93–5.48 mm length × 2.57–2.79 mm width × 2.26 mm height (max); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path terminal | No polarity designation; either terminal serves as input or return path depending on transient polarity-enables placement flexibility on PCB without orientation constraints. |
| Case / Body | Thermal and mechanical interface | Non-conductive epoxy body provides electrical isolation; wide lead geometry maximizes copper pad contact area for efficient heat transfer to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN bus, audio inputs) without external polarity management. |
| IEC61000-4-5 Class 4 support (12 Ω source) | Withstands 4 kV surge testing per secondary lightning standard using 12 Ω impedance source-validates performance in harsh industrial mains-connected equipment. |
| Sub-5 ns response time | Clamps transients before sensitive logic or analog circuitry can be damaged-critical for protecting high-speed interfaces like USB, Ethernet PHYs, and microcontroller GPIOs. |
| Tape-and-reel packaging (TR13) | 2500-unit reels conforming to EIA-481-1-A standard-optimized for high-volume SMT placement with consistent feed reliability and traceable lot control. |
| Moisture Sensitivity Level 1 | No baking or dry pack required prior to reflow; reduces manufacturing overhead and eliminates moisture-related popcorning risk during assembly. |
Applications
| Industrial PLC Analog Inputs | Automotive Body Control Module (BCM) Power Rails |
|---|---|
Use Scenario: Protection of 4–20 mA current-loop sensor interfaces against induced surges from nearby motor switching or relay coil flyback. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between signal line and chassis ground, acting as first-line defense upstream of precision op-amps and ADCs. Use Value: Limits transient voltage to ≤71.4 V, preventing latch-up or permanent damage to 24 V-rated signal conditioning ICs while maintaining <1 µA leakage at normal operating voltage. |
Use Scenario: Safeguarding 12 V battery-supplied microcontrollers and LIN transceivers from load-dump and jump-start transients in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional clamp on VCC rail and communication lines, absorbing energy from ISO 7637-2 Pulse 5a (load dump) and Pulse 1 (inductive switch-off). Use Value: Withstands 500 W surges with <5 ns response, ensuring system-level immunity to automotive transients without adding series impedance or signal distortion. |
| Telecom Ethernet Port Protection | Medical Patient Monitoring Signal Lines |
Use Scenario: Shielding RJ45 magnetics and PHY ICs from ESD events and lightning-induced surges entering via unshielded twisted-pair cabling in enterprise switches and PoE injectors. IC Role / Device Role / Timing Role: Common-mode TVS array element (used per pair) providing symmetric clamping on differential pairs without disrupting 100 Ω impedance matching. Use Value: Maintains signal integrity with minimal capacitance (typ. 100 pF @ 0 V, half that of unidirectional variant), while meeting IEC61000-4-2 Level 4 (±8 kV contact) requirements. |
Use Scenario: Protecting isolated ECG/EEG front-end amplifiers and patient-connected sensors from accidental ESD discharge during clinical handling or equipment maintenance. IC Role / Device Role / Timing Role: Low-leakage bidirectional clamp on isolated analog signal paths, placed immediately after isolation barrier to prevent transient coupling into sensitive biopotential circuits. Use Value: Delivers <1 µA standby current at 40 V standoff-preserving ultra-high input impedance (>1012 Ω) critical for accurate biopotential measurement without baseline drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA | Same electrical specs and DO-214AC package; lacks "e3" RoHS suffix and TR13 tape-and-reel packaging-uses bulk or different reel format. | Not suitable for Pb-free SMT lines requiring certified matte-tin plating or automated pick-and-place with EIA-481-1-A compliance. | Select SMAJ40CA only for legacy non-RoHS designs or manual assembly where plating and packaging are not constrained. |
| SMBJ40CA | Lower 400 W peak power rating (vs. 500 W), identical VWM/VBR/VC, but larger SMB (DO-214AA) package with higher thermal resistance (90 °C/W vs. 80 °C/W). | Acceptable for lower-energy surge environments (e.g., consumer electronics), but may derate prematurely in sustained industrial transients. | Choose SMBJ40CA only when board space allows larger footprint and application surge profile is confirmed ≤400 W. |
Compared with SMAJ40CA and SMBJ40CA, SMAJ40CE3/TR13 uniquely combines full 500 W surge capacity, RoHS-compliant matte-tin plating, and EIA-481-1-A tape-and-reel packaging-making it the optimal choice for high-volume, automotive-qualified, and industrial-grade automated production.
Availability
SMAJ40CE3/TR13 is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body electronics, and medical signal acquisition systems requiring stable component supply, full RoHS compliance, and verified surge immunity per IEC61000-4-2/4-4/4-5.
Supply support for SMAJ40CE3/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 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 does the "C" and "E3" in SMAJ40CE3/TR13 signify?
The "C" denotes bidirectional configuration-meaning the device clamps voltage surges of either polarity without requiring orientation during placement. The "E3" suffix confirms RoHS compliance with annealed matte-tin plating per MIL-STD-750 Method 2026, enabling compatibility with lead-free reflow soldering profiles up to 260 °C. SMAJ40CE3/TR13 thus guarantees both symmetrical protection and environmentally compliant manufacturing readiness.
How does SMAJ40CE3/TR13 differ from unidirectional SMAJ40A variants?
SMAJ40CE3/TR13 provides symmetrical clamping for AC or floating signals, whereas SMAJ40A is unidirectional with a cathode band and conducts only in reverse bias. SMAJ40CE3/TR13 has no polarity marking, double the capacitance of SMAJ40A at 0 V (≈100 pF vs. ≈50 pF), and is rated for IEC61000-4-5 Class 4 with 12 Ω source-making it ideal for differential data lines and isolated power domains where polarity cannot be assumed.
What is the maximum clamping voltage of SMAJ40CE3/TR13 under surge conditions?
The maximum clamping voltage (VC) of SMAJ40CE3/TR13 is 71.4 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPP) of 7.0 A. This value is guaranteed across temperature and production lot-ensuring downstream components see no more than 71.4 V during standardized surge events, a critical parameter for validating system-level overvoltage margins in safety-critical designs.
Is SMAJ40CE3/TR13 suitable for IEC61000-4-5 secondary lightning protection?
Yes-SMAJ40CE3/TR13 is explicitly rated for IEC61000-4-5 secondary lightning protection with both 12 Ω and 42 Ω source impedances. At 12 Ω, it supports Class 1 (up to 4 kV) and Class 2 (up to 2 kV); at 42 Ω, it covers Class 1 through Class 4. Its 500 W peak power rating and sub-5 ns response ensure reliable energy diversion without thermal runaway during multi-pulse lightning test sequences.
What packaging format does the "TR13" suffix indicate for SMAJ40CE3/TR13?
The "TR13" suffix indicates tape-and-reel packaging per EIA-481-1-A standard, with 2500 units per 13-inch reel. This format ensures consistent feeding in high-speed SMT pick-and-place machines, supports full traceability via reel labeling, and aligns with industry-standard logistics for volume production. SMAJ40CE3/TR13's TR13 packaging eliminates manual handling risks and enables seamless integration into automated assembly lines.
SMAJ40CE3/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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 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)
SMAJ40CE3/TR13 FAQ
1.How can I place an order for SMAJ40CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CE3/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 SMAJ40CE3/TR13 reliable?
The price and inventory of SMAJ40CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ40CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CE3/TR13?
SMAJ40CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CE3/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 SMAJ40CE3/TR13?
For technical support, including SMAJ40CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ40CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ40CE3/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 SMAJ40CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ40CE3/TR13?
All SMAJ40CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CE3/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 SMAJ40CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ40CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40CE3/TR13 Tags
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