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Microchip Technology SMAJ18CE3/TR13
- Part No.:
- SMAJ18CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ18CE3/TR13.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,260
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Product details
Overview
SMAJ18CE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) diode 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 per 10/1000 µs waveform - deployed in industrial I/O, telecom interfaces, and automotive body electronics.
For engineers reviewing the SMAJ18CE3/TR13 datasheet, SMAJ18CE3/TR13 pinout, SMAJ18CE3/TR13 application, or SMAJ18CE3/TR13 equivalent, key selection criteria include bidirectional clamping capability, RoHS-compliant matte-tin plating, DO-214AC package compatibility, and IEC61000-4-2/4-4/4-5 compliance for system-level EMC hardening.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with clamping response <5 ns and sub-1 µA standby leakage at 18 V. Its silicon avalanche structure delivers precise, repeatable breakdown at 20.0 V ±5% under 1 mA test current, enabling predictable overvoltage limiting without forward conduction during normal operation.
The device uses a thermally optimized DO-214AC (SMA) package with wide leads for low thermal resistance (15 °C/W junction-to-lead), supporting sustained 5 W steady-state dissipation at 75 °C lead temperature - critical for high-reliability power rail protection where ambient temperatures exceed 85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets operating margin for 12–15 V nominal rails. |
| VBR min | 20.0 V @ 1 mA - Confirmed avalanche onset threshold; ensures reliable triggering before downstream IC damage. |
| VC @ IPP | 32.2 V @ 15.5 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on protected circuitry. |
| PPP | 500 W - Peak pulse power handling per standard waveform; supports Class 3/4 IEC61000-4-5 lightning surges. |
| IPP | 15.5 A - Maximum non-destructive surge current; determines minimum series impedance required for coordination. |
| ID @ VWM | <1 µA - Ultra-low leakage at rated standoff; avoids loading sensitive analog or battery-backed circuits. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 2.57–2.79 mm width and 4.93–5.48 mm length; compatible with automated placement. |
Pinout & Package
DO-214AC (SMA) package: void-free thermosetting epoxy body, UL94V-0 rated, with C-bend (modified J-bend) matte-tin plated leads. Cathode band omitted - bidirectional symmetry confirmed by CA suffix per Microsemi documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Reversible polarity terminals | Identical avalanche behavior in both directions; no polarity marking required; enables single-component protection of AC-coupled or floating lines. |
| Case | Non-electrical mechanical interface | Thermally conductive epoxy body transfers heat to PCB copper; requires recommended pad layout (2.57 × 4.93 mm min) for rated 15 °C/W thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses (e.g., RS-485), and ungrounded power domains without polarity concerns. |
| IEC61000-4-5 Class 4 support | Withstands 12 Ω source impedance surges up to 12 A peak - meets stringent secondary lightning requirements for telecom and industrial gateways. |
| RoHS-compliant matte-tin plating | Meets JEDEC J-STD-020B Level 1 moisture sensitivity; eliminates dry-pack requirement and supports lead-free reflow (260 °C/10 s). |
| 500 W 10/1000 µs rating | Provides 3× higher surge energy handling than 200 W SMAJ variants - extends protection lifetime in high-inductance switching environments. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input channels on programmable logic controllers exposed to relay coil flyback and field wiring transients. IC Role / Device Role / Timing Role: Primary surge clamp placed between terminal block and input conditioning circuitry; responds within <5 ns to limit voltage to ≤32.2 V. Use Value: Prevents damage to optocouplers and MCU GPIOs during 1 kV/500 A surge events per IEC61000-4-4, maintaining functional safety integrity. | Use Scenario: LIN bus transceivers and sensor supply lines in door modules subjected to load dump and ESD from human contact. IC Role / Device Role / Timing Role: Bidirectional TVS shunting transients on 12 V supply and LIN data lines; symmetrical clamping avoids signal inversion or bias shift. Use Value: Enables compliance with ISO 10605 (330 pF/330 Ω ESD) and SAE J1113-11 without additional polarity-specific components. |
| Telecom Power Feeds | Medical Patient Monitoring Ports |
Use Scenario: -48 V DC power inputs in remote radio units exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Secondary lightning protector upstream of DC-DC converters; clamps 42 Ω source impedance surges per IEC61000-4-5 Class 1. Use Value: Limits voltage excursion to 32.2 V during 2.5 kA surges, preserving converter input stage reliability and reducing need for oversized input capacitors. | Use Scenario: Isolated analog sensor inputs (e.g., ECG leads) connected to patient-facing connectors vulnerable to hospital-grade ESD. IC Role / Device Role / Timing Role: Low-leakage (<1 µA) TVS on signal path prior to isolation amplifier; prevents latch-up while adding <0.5 pF capacitance. Use Value: Maintains signal fidelity and common-mode rejection ratio (CMRR) during 15 kV air discharge events per IEC61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same electrical specs and DO-214AC package; lacks "e3" RoHS suffix and TR13 tape-and-reel packaging. | No compliance documentation for lead-free assembly; requires dry pack per J-STD-020B Level 2a if stored >1 year. | Select SMAJ18CA only for legacy non-RoHS production or when tape/reel quantity differs from 2500/reel. |
| SMBJ18CA | Same VWM/VC/IPP, but SMB (DO-214AA) package - 30% smaller footprint and 25% lower thermal mass. | Lower 400 W peak power rating; unsuitable for repeated Class 4 surges or high-temperature ambient (>105 °C) deployments. | Choose SMBJ18CA only for space-constrained designs with verified lower surge exposure and derated thermal design. |
Compared with SMAJ18CA and SMBJ18CA, SMAJ18CE3/TR13 uniquely combines RoHS compliance, 2500-unit tape-and-reel packaging, full 500 W surge rating, and documented IEC61000-4-5 Class 4 capability - making it optimal for volume industrial and medical manufacturing requiring traceable, compliant, and thermally robust TVS protection.
Availability
SMAJ18CE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power feeds requiring stable component supply with full RoHS compliance and IEC61000-4-5 certification evidence.
Supply support for SMAJ18CE3/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 ICs, RF solutions, and discrete protection devices for aerospace, defense, and industrial markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in harsh environments - emphasizing repeatable clamping, low leakage, and thermal resilience in DO-214AC packages for mission-critical power and signal line protection.
FAQ
What does the "CA" suffix indicate in SMAJ18CE3/TR13?
The "CA" suffix in SMAJ18CE3/TR13 denotes a bidirectional configuration - meaning the device provides symmetrical avalanche clamping in both forward and reverse directions, with identical VBR and VC characteristics. This eliminates polarity marking and enables use on AC-coupled lines, differential buses, or ungrounded systems without risk of incorrect orientation. SMAJ18CE3/TR13 has no cathode band, confirming its bidirectional nature per Microsemi's MSC0270A datasheet.
Is SMAJ18CE3/TR13 compliant with IEC61000-4-5 for secondary lightning protection?
Yes, SMAJ18CE3/TR13 is validated for IEC61000-4-5 secondary lightning protection with both 12 Ω and 42 Ω source impedances. Per Microsemi's MSC0270A Rev L, it supports Class 4 (12 Ω, up to 12 A peak) and Class 1 (42 Ω, up to 2.5 kA) testing - making SMAJ18CE3/TR13 suitable for telecom power feeds, industrial Ethernet ports, and outdoor sensor nodes where induced surges are a primary failure mode.
What is the maximum clamping voltage of SMAJ18CE3/TR13 under surge conditions?
The maximum clamping voltage (VC) of SMAJ18CE3/TR13 is 32.2 V at 15.5 A peak pulse current (IPP) under the standardized 10/1000 µs double-exponential waveform. This value is measured per Figure 2 in the MSC0270A datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case transients - critical for ensuring downstream ICs (e.g., 3.3 V or 5 V logic) remain within absolute maximum ratings when SMAJ18CE3/TR13 is correctly coordinated with series impedance.
Does SMAJ18CE3/TR13 require special PCB layout considerations?
Yes, SMAJ18CE3/TR13 requires adherence to Microsemi's recommended pad layout (2.57–2.79 mm width, 4.93–5.48 mm length) to achieve its rated 15 °C/W junction-to-lead thermal resistance. Use of undersized pads or insufficient copper pour increases thermal impedance, degrading surge endurance and steady-state power handling. The DO-214AC footprint must also maintain ≥0.5 mm clearance to adjacent traces to prevent arcing during high-energy clamping events involving SMAJ18CE3/TR13.
How does the "e3" and "TR13" in SMAJ18CE3/TR13 affect procurement and assembly?
The "e3" suffix certifies SMAJ18CE3/TR13 as RoHS-compliant with annealed matte-tin plating, eliminating lead content and meeting JEDEC J-STD-020B Level 1 moisture sensitivity - no dry pack required. The "TR13" indicates tape-and-reel packaging on a 13-inch reel containing 2500 units, optimized for high-volume SMT placement. Together, these identifiers ensure SMAJ18CE3/TR13 supports lead-free reflow profiles (260 °C/10 s) and automated manufacturing without process deviations or moisture-related defects.
SMAJ18CE3/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:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SMAJ18CE3/TR13 FAQ
1.How can I place an order for SMAJ18CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ18CE3/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 SMAJ18CE3/TR13 reliable?
The price and inventory of SMAJ18CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ18CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ18CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ18CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ18CE3/TR13?
SMAJ18CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ18CE3/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 SMAJ18CE3/TR13?
For technical support, including SMAJ18CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ18CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ18CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ18CE3/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 SMAJ18CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ18CE3/TR13?
All SMAJ18CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ18CE3/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 SMAJ18CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ18CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ18CE3/TR13 Tags
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