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Microchip Technology SMAJ40AE3/TR13
- Part No.:
- SMAJ40AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40AE3/TR13.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,884
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Product details
Overview
SMAJ40AE3/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 40 V working peak standoff voltage (VWM), 44.4 V minimum breakdown voltage (VBR), 71.4 V maximum clamping voltage (VC) at 7.0 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform-used in industrial power supply input stages and automotive body control modules.
For engineers reviewing the SMAJ40AE3/TR13 datasheet, SMAJ40AE3/TR13 pinout, SMAJ40AE3/TR13 application, or SMAJ40AE3/TR13 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, IEC 61000-4-5 secondary lightning compliance (Class 4 with 12 Ω source), unidirectional polarity marking, and RoHS-compliant matte-tin terminations on DO-214AC package.
Technical Context
This TVS operates as a silicon avalanche diode with fast response (<100 ps theoretical turn-on from 0 V to VBR min), low dynamic impedance, and controlled clamping behavior under standardized surge waveforms. Its unidirectional configuration provides forward conduction capability (40 A peak surge, 3.5 V max forward voltage) while blocking reverse leakage (<1 µA at 40 V).
The device is rated for continuous operation from –65 °C to +150 °C, with thermal resistance of 15 °C/W junction-to-lead and 80 °C/W junction-to-ambient on FR4 board (1 oz Cu, recommended footprint). It meets IEC 61000-4-2 (ESD ±30 kV air/±25 kV contact), IEC 61000-4-4 (EFT 4 kV), and IEC 61000-4-5 (lightning surge, 42 Ω & 12 Ω source impedances).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line nominal voltage. |
| VBR min @ IBR | 44.4 V @ 1 mA - Minimum voltage at which avalanche conduction begins; ensures reliable triggering above system operating voltage. |
| VC @ IPP | 71.4 V @ 7.0 A - Clamped voltage during 10/1000 µs surge; must remain below downstream IC's absolute max rating. |
| PPP | 500 W - Peak pulse power handling capacity; defines survivability against standardized lightning/switching transients. |
| ID @ VWM | <1 µA - Reverse standby leakage at 40 V; negligible power loss and no interference with high-impedance sensing circuits. |
| tclamp | <100 ps - Theoretical time from 0 V to VBR min; enables protection of nanosecond-scale ESD events before damage occurs. |
| Package | DO-214AC (SMAJ) - Industry-standard surface-mount outline with wide leads for thermal dissipation and mechanical robustness. |
Pinout & Package
DO-214AC (SMAJ) package with cathode-indicated band marking; void-free thermosetting epoxy body (UL94V-0), C-bend (modified J-bend) matte-tin plated leads solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path / ground reference | Connected to system ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected to line being protected (e.g., 36–40 V rail); marked by visible band; blocks reverse leakage up to VWM. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" termination | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; no dry pack required prior to reflow. |
| Tape-and-reel packaging | TR13 suffix indicates 2500 units per 13-inch reel per EIA-481-1-A standard; supports automated SMT placement. |
| IEC 61000-4-5 Class 4 compliance | Validated for secondary lightning surges with 12 Ω source impedance up to 40 V standoff-covers harsh automotive/industrial environments. |
| Unidirectional polarity | Cathode band marking enables correct orientation during assembly; prevents reverse-bias failure on DC rails. |
| High surge current capability | Withstands 40 A peak forward surge (8.3 ms half-sine) at ≤3.5 V forward voltage-supports load dump and inductive kick protection. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 36–40 V DC input stage of DIN-rail mounted PLC power supplies exposed to load dump and switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges before they reach upstream DC/DC controller ICs. Use Value: 71.4 V clamping ensures protected controller ICs (e.g., LM5017, UCC28950) remain within 80 V absolute max rating under 10/1000 µs surges. |
Use Scenario: LIN bus or 12 V auxiliary power line in BCM subjected to ISO 7637-2 Pulse 5a (load dump) and ESD events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on battery-supplied rail feeding microcontroller I/O and CAN transceivers. Use Value: Sub-100 ps response and 500 W rating enable suppression of fast transients without affecting 19.2 kbps LIN timing integrity. |
| Telecom Remote Radio Unit (RRU) Power Interface | Renewable Energy Inverter DC Link Monitoring |
Use Scenario: -48 V DC power feed to outdoor RRU enclosures experiencing induced lightning surges and EFT noise. IC Role / Device Role / Timing Role: First-stage protection on telecom power entry, coordinated with downstream GDT and MOV stages. Use Value: 40 V VWM allows safe operation across -48 V ±10% tolerance while clamping to 71.4 V to protect isolated DC/DC bias supplies. |
Use Scenario: Voltage sense line monitoring 600–1000 V DC link in solar string inverters, where transients couple via parasitic capacitance. IC Role / Device Role / Timing Role: Low-capacitance TVS on high-impedance analog sensing path to prevent ADC saturation during grid-switching events. Use Value: <1 µA leakage at 40 V ensures minimal error in 16-bit voltage measurement circuits without requiring active guarding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AHE3/TR13 | Same electrical specs but with enhanced screening (avionics-grade temperature cycling, HTRB, surge testing per MIL-PRF-19500 JANTX). | Required for aerospace flight-critical systems; not needed for commercial industrial use. | Select SMAJ40AHE3/TR13 only if MIL-PRF-19500 JANTX qualification or extended reliability screening is mandated. |
| SMBJ40A-E3/52 | Same VWM, VBR, VC, but SMB package (DO-214AA) with lower PPP = 600 W (10/1000 µs) and higher thermal resistance (junction-to-ambient ≈ 100 °C/W). | Lower power density; suitable for lower-energy surge environments or space-constrained layouts where DO-214AC footprint is unavailable. | Choose SMBJ40A-E3/52 only when PCB real estate is constrained and peak surge energy is verified ≤600 W. |
Compared with SMAJ40AE3/TR13, SMAJ40AHE3/TR13 adds avionics-grade screening without altering clamping performance, while SMBJ40A-E3/52 trades package size for reduced thermal performance and slightly higher clamping uncertainty under sustained surge conditions.
Availability
SMAJ40AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive body control module (BCM) design, and telecom remote radio unit (RRU) power interface applications requiring stable component supply, RoHS compliance, and IEC 61000-4-5 Class 4 surge immunity.
Supply support for SMAJ40AE3/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 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 developed specifically for surface-mount transient voltage suppression in high-energy surge environments, emphasizing fast response, repeatable clamping, and robust thermal performance in compact DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ40AE3/TR13 under a 10/1000 µs surge?
The SMAJ40AE3/TR13 has a maximum clamping voltage (VC) of 71.4 V at 7.0 A peak pulse current (IPP) under the standardized 10/1000 µs double-exponential 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.
Is SMAJ40AE3/TR13 unidirectional or bidirectional?
SMAJ40AE3/TR13 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" in its part number suffix. It conducts in the forward direction (anode to cathode) during overvoltage events and blocks reverse current up to its 40 V working peak standoff voltage (VWM), with cathode polarity marked by a visible band on the DO-214AC package.
Does SMAJ40AE3/TR13 meet IEC 61000-4-5 for lightning surge protection?
Yes, SMAJ40AE3/TR13 is validated for IEC 61000-4-5 secondary lightning surge immunity with both 42 Ω and 12 Ω source impedances. At 40 V VWM, it qualifies for Class 4 (12 Ω source) and Class 1 (42 Ω source), supporting protection of 36–40 V systems against induced lightning effects in industrial and automotive applications.
What is the maximum steady-state power dissipation of SMAJ40AE3/TR13?
The SMAJ40AE3/TR13 dissipates up to 5 W continuously at lead temperature (TL) of 75 °C, or 1.56 W at ambient temperature (TA) of 25 °C when mounted on an FR4 PCB with 1 oz copper and Microsemi's recommended footprint. These ratings reflect thermal limits under DC or low-duty-cycle conditions-not transient surge handling.
What does the "TR13" suffix indicate in SMAJ40AE3/TR13?
The "TR13" suffix in SMAJ40AE3/TR13 specifies tape-and-reel packaging: 2500 units per 13-inch reel, compliant with EIA-481-1-A standards. This format enables automated pick-and-place assembly and is distinct from bulk or ammo-pack options; the "e3" denotes RoHS-compliant matte-tin plating.
SMAJ40AE3/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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMAJ40AE3/TR13 FAQ
1.How can I place an order for SMAJ40AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40AE3/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 SMAJ40AE3/TR13 reliable?
The price and inventory of SMAJ40AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ40AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40AE3/TR13?
SMAJ40AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40AE3/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 SMAJ40AE3/TR13?
For technical support, including SMAJ40AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ40AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ40AE3/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 SMAJ40AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ40AE3/TR13?
All SMAJ40AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40AE3/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 SMAJ40AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ40AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40AE3/TR13 Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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