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Microchip Technology SMAJ18CAE3/TR13
- Part No.:
- SMAJ18CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ18CAE3/TR13.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
SMAJ18CAE3/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 18 V reverse standoff voltage (VWM), 20.0 V minimum breakdown voltage (VBR), 32.2 V maximum clamping voltage (VC) at 15.5 A peak pulse current (IPP), and 500 W peak pulse power rating at 10/1000 µs waveform - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ18CAE3/TR13 datasheet, SMAJ18CAE3/TR13 pinout, SMAJ18CAE3/TR13 application, or SMAJ18CAE3/TR13 equivalent, this device is evaluated for IEC61000-4-2 (±15 kV contact), IEC61000-4-4 (±2 kV fast transient), and IEC61000-4-5 (Class 4, 42 Ω source) compliance with sub-5 ns response time and RoHS-compliant matte-tin terminations.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its silicon avalanche structure delivers <5 ns clamping response and maintains stable VBR tolerance (±5%) under 1 mA test current, with thermal resistance of 15 °C/W junction-to-lead when soldered to recommended FR4 footprint.
The DO-214AC (SMA) package supports 0.064 g mass and 12 mm tape/reel packaging (TR13 suffix), with void-free UL94V-0 epoxy body and C-bend leads compatible with standard SMT reflow profiles up to 260 °C for 10 s. Standby leakage remains ≤1 μA at 18 V, ensuring minimal impact on low-power sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous DC or RMS voltage the device blocks without conduction; defines operating rail compatibility. |
| VBR min @ IBR | 20.0 V @ 1 mA - Minimum voltage at which avalanche breakdown initiates; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 32.2 V @ 15.5 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient overvoltage exposure. |
| PPP | 500 W - Peak pulse power handling capability; enables suppression of high-energy transients like inductive switch-off spikes. |
| IPP | 15.5 A - Peak current survivable at VC; directly correlates to surge immunity level per IEC61000-4-5 Class 4 (42 Ω source). |
| ID @ VWM | ≤1 μA - Reverse leakage at rated standoff; critical for battery-powered or high-impedance analog sensor nodes. |
| Response Time | <5 ns - Bidirectional clamping delay; ensures protection before sensitive ICs experience destructive overvoltage. |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band omitted (bidirectional configuration); void-free UL94V-0 epoxy body; C-bend matte-tin plated leads; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | Identical electrical behavior in either polarity; connects across protected line and ground (or between differential lines) without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional architecture | Enables single-device protection of AC signals, RS-485 buses, or ungrounded power inputs without polarity concerns. |
| IEC61000-4-5 Class 4 compliance | Validated for 1 kV surge immunity with 42 Ω source impedance - suitable for industrial fieldbus and automotive sub-systems. |
| RoHS-compliant "e3" termination | Matte-tin plating meets JEDEC J-STD-020B reflow requirements and eliminates lead-based solder compatibility issues. |
| 500 W peak pulse rating | Supports suppression of high-energy transients from relay coil de-energization or motor commutation in 24 V systems. |
| Low thermal resistance (15 °C/W) | Facilitates efficient heat transfer to PCB copper pour, enabling sustained operation under repeated surge events. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge clamp placed between input rail and ground, absorbing energy before it reaches DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤32.2 V during 15.5 A surges, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: LIN bus transceiver interface subjected to ESD events and battery reversal transients in door module electronics. IC Role / Device Role / Timing Role: Bidirectional TVS connected across LIN data line and ground, providing symmetrical clamping for ±15 kV contact discharge. Use Value: Sub-5 ns response ensures clamping occurs before LIN transceiver input stages exceed absolute maximum ratings (±18 V). |
| RS-485 Communication Port | Smart Energy Meter Sensor Interface |
Use Scenario: Half-duplex RS-485 transceiver (e.g., MAX13487) in utility metering infrastructure exposed to induced lightning surges. IC Role / Device Role / Timing Role: Placed across A/B differential pair and ground, suppressing common-mode transients while preserving signal integrity. Use Value: 32.2 V clamping voltage ensures transceiver inputs remain within safe operating range (typically ±12 V) during 1 kV IEC61000-4-5 surges. |
Use Scenario: Analog temperature/humidity sensor node powered by 3.3 V LDO, connected to long PCB traces acting as ESD antennas. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) TVS shunting transient energy from sensor supply rail to ground without loading quiescent current budget. Use Value: Enables reliable operation in battery-backed meters where standby current must stay below 5 μA - leakage contributes <0.02% of budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/54 (Vishay) | Unidirectional; identical VWM, VBR, VC, and PPP, but requires correct polarity placement and lacks symmetrical AC protection. | Suitable only for DC rails with known polarity; not usable on floating or AC-coupled lines. | Select when protecting single-polarity 24 V power inputs where board layout allows strict orientation control. |
| SMCJ18CA (Littelfuse) | Same bidirectional function and VWM/VC specs, but higher 1500 W PPP rating and DO-214AB (SMB) package (larger footprint, 2.5× height). | Used where higher surge energy (e.g., 10/1000 µs 40 A) is expected, requiring more PCB area and thermal mass. | Choose for heavy-duty industrial motor drives where 500 W is insufficient, accepting larger board space and cost premium. |
Compared with SMAJ18A-E3/54, SMAJ18CAE3/TR13 provides polarity-agnostic protection essential for differential buses; versus SMCJ18CA, it offers identical surge performance in a 30% smaller DO-214AC footprint ideal for space-constrained consumer and automotive ECUs.
Availability
SMAJ18CAE3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, RS-485 communication ports, and smart energy meter sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMAJ18CAE3/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 components for aerospace, defense, and industrial markets.
The SMAJ series was engineered for surface-mount transient suppression in harsh environments - delivering military-grade surge resilience, low-inductance packaging, and validated IEC/ISO compliance in compact DO-214AC form factor.
FAQ
What does the "CA" suffix indicate in SMAJ18CAE3/TR13?
The "CA" suffix in SMAJ18CAE3/TR13 denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMAJ18A), SMAJ18CAE3/TR13 has no anode/cathode distinction and functions identically regardless of polarity, making it ideal for AC-coupled lines, differential buses, or floating grounds where voltage reversals occur.
Is SMAJ18CAE3/TR13 compliant with IEC61000-4-5 for lightning surge protection?
Yes, SMAJ18CAE3/TR13 is validated for IEC61000-4-5 secondary lightning surge immunity with 42 Ω source impedance up to Class 4 (1 kV test level). Its 32.2 V clamping voltage at 15.5 A peak pulse current ensures protected circuits remain within safe operating limits during standardized surge waveforms, meeting requirements for industrial control panels and outdoor metering equipment.
What is the maximum steady-state power dissipation of SMAJ18CAE3/TR13?
SMAJ18CAE3/TR13 dissipates up to 1.56 W continuously at 25 °C ambient temperature when mounted on a standard FR4 PCB with 1 oz copper and the recommended footprint. At lead temperature (TL) of 75 °C, its steady-state rating increases to 5 W - reflecting superior thermal coupling to PCB copper pours, which is critical for designs with frequent low-energy transients.
Does SMAJ18CAE3/TR13 require special handling for moisture sensitivity?
No - SMAJ18CAE3/TR13 is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without dry packing or baking prior to reflow. This eliminates moisture-related popcorning risk during standard SMT assembly and reduces manufacturing overhead for high-volume production.
How does the "TR13" suffix affect packaging and logistics for SMAJ18CAE3/TR13?
The "TR13" suffix indicates SMAJ18CAE3/TR13 is supplied in 13-inch reels containing 2500 units, conforming to EIA-481-1-A tape-and-reel standards with 12 mm carrier tape width. This format enables seamless integration into high-speed pick-and-place systems and supports just-in-time replenishment for automated SMT lines producing automotive or industrial electronics.
SMAJ18CAE3/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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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)
SMAJ18CAE3/TR13 FAQ
1.How can I place an order for SMAJ18CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ18CAE3/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 SMAJ18CAE3/TR13 reliable?
The price and inventory of SMAJ18CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ18CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ18CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ18CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ18CAE3/TR13?
SMAJ18CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ18CAE3/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 SMAJ18CAE3/TR13?
For technical support, including SMAJ18CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ18CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ18CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ18CAE3/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 SMAJ18CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ18CAE3/TR13?
All SMAJ18CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ18CAE3/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 SMAJ18CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ18CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ18CAE3/TR13 Tags
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Diodes Incorporated
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