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Microchip Technology SM8LC12E3/TR13
- Part No.:
- SM8LC12E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SM8LC12E3/TR13.pdf
- Description:
- TVS DIODE 12VWM 24VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,393
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Product details
Overview
SM8LC12E3/TR13 from Microsemi (now Microchip Technology) is a bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 500 W peak pulse power (8/20 µs), 12 V standoff voltage (VWM), and 19 V clamping voltage at 1 A. It provides board-level ESD protection per IEC 61000-4-2 (±15 kV contact), EFT per IEC 61000-4-4, and lightning-induced surge suppression for I/O transceivers and microprocessor data lines.
For engineers reviewing the SM8LC12E3/TR13 datasheet, SM8LC12E3/TR13 pinout, SM8LC12E3/TR13 application, or SM8LC12E3/TR13 equivalent, key selection criteria include VWM ≥ circuit operating voltage, low 25 pF line-to-line capacitance for high-speed signal integrity, SO-8 thermal and layout compatibility, and verified IEC 61000-4-2/4-4 compliance for industrial and telecom interface protection.
Technical Context
This TVS array integrates two identical, electrically isolated bidirectional protection channels in a single SO-8 package. Each channel features a symmetrical avalanche diode structure with 12 V working peak reverse voltage and 13.3 V minimum breakdown voltage at 1 mA, enabling reliable clamping during fast transients without forward conduction during normal operation.
The device operates across –55 °C to +150 °C and maintains stable clamping performance up to 24 V at 5 A (IEC 61000-4-2 Level 4), with leakage current ≤1 µA at VWM and temperature coefficient of VBR at +8 mV/°C - supporting robust performance in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 12 V - must be ≥ continuous peak operating voltage of protected line to avoid leakage or false triggering |
| Breakdown Voltage (VBR, min @ 1 mA) | 13.3 V - ensures reliable avalanche conduction onset before damage to downstream TTL/CMOS logic |
| Clamping Voltage (VC @ 1 A) | 19 V - limits transient voltage seen by protected IC to safe level during ESD event |
| Peak Pulse Power (8/20 µs) | 500 W - supports high-energy surge handling per IEC 61000-4-5 waveform requirements |
| Line-to-Line Capacitance (@ 1 MHz, 0 V) | 25 pF - preserves signal integrity on USB 2.0, RS-485, or CAN FD interfaces up to ~100 MHz |
| Operating Temperature Range | –55 °C to +150 °C - enables use in extended-temperature industrial motor drives and automotive body controllers |
| ESD Rating (IEC 61000-4-2) | ±15 kV contact, ±20 kV air - exceeds Level 4 immunity for front-panel buttons, serial ports, and sensor interfaces |
Pinout & Package
SO-8 surface-mount package (JEDEC MS-012AC), 4.9 mm × 6.0 mm footprint, 1.75 mm max height, with pin #1 identified by dot marking. Molded plastic body with gull-wing leads; RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode of Channel 1 | Connects to first protected data line (e.g., RS-485 A); forms bidirectional path with Pin 2 |
| 2 | Cathode of Channel 1 | Common reference node for Channel 1; ties to ground plane via low-inductance path |
| 3 | Anode of Channel 2 | Connects to second protected line (e.g., RS-485 B); symmetric with Pin 1 for differential pair protection |
| 4 | Cathode of Channel 2 | Shared cathode node with Pin 2 - enables dual-channel protection with single ground connection |
| 5–8 | Thermal Pad / Ground Tie | Not electrically active; soldered to PCB ground pour to enhance thermal dissipation during 500 W surges |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional dual-line protection | Single SO-8 device safeguards two independent I/O lines without polarity constraints - ideal for RS-485, CAN, or USB D+/D– |
| Low 25 pF capacitance per line pair | Minimizes signal distortion and timing skew on high-speed digital interfaces up to 100 Mbps |
| 500 W peak pulse rating (8/20 µs) | Withstands repeated lightning-induced surges per IEC 61000-4-5 without degradation |
| Electrically isolated channels | Prevents cross-talk between protected lines and avoids ground loop coupling in multi-channel systems |
| –55 °C to +150 °C operation | Validated for under-hood automotive ECUs and industrial PLC backplanes without derating |
Applications
| RS-485 Industrial Bus | Automotive CAN FD Interface |
|---|---|
Use Scenario: Protection of half-duplex RS-485 transceivers in factory automation PLCs exposed to EFT noise from nearby motor drives. IC Role / Device Role: Board-level TVS array clamping induced transients on A/B differential pair before reaching MAX13487E transceiver input pins. Use Value: Maintains 25 pF capacitance to preserve 12 Mbps signal edge rate while limiting clamped voltage to ≤24 V at 5 A surge. | Use Scenario: ESD hardening of CAN FD nodes in ADAS domain controllers where infotainment and radar modules share bus infrastructure. IC Role / Device Role: Dual-channel bidirectional suppressor placed at connector entry point to absorb ±15 kV contact discharge per ISO 10605. Use Value: 12 V VWM matches 12 V CAN bus nominal, and 13.3 V VBR prevents false triggering during load dump transients. |
| USB 2.0 Host Port | Microprocessor GPIO Expansion |
Use Scenario: Front-panel USB 2.0 Type-A port on medical diagnostic equipment requiring IEC 60601-1-2 ESD compliance. IC Role / Device Role: Line-pair TVS on D+ and D− lines upstream of USB PHY, with shared cathode tied to chassis ground. Use Value: 25 pF capacitance avoids USB 2.0 eye diagram closure; 19 V clamping protects TUSB1210 PHY's 3.3 V I/O rails. | Use Scenario: Protection of 3.3 V GPIO expansion headers on ARM-based industrial HMI boards handling external sensor wiring. IC Role / Device Role: Bidirectional clamp on each GPIO pair (e.g., interrupt + enable) to prevent latch-up from field-wire ESD events. Use Value: 1 µA max leakage at 12 V VWM ensures no measurable current draw on 3.3 V logic lines during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Single-channel, DO-214AC package; 12 V VWM, 19.9 V VC @ 1 A; 600 W rating but higher 40 pF capacitance | Requires two devices and additional PCB area for dual-line protection; less suitable for space-constrained differential interfaces | Choose when discrete layout flexibility is prioritized over board-level integration and capacitance budget |
| SP1003-010 | Single-line, SOD-323 package; 10 V VWM, 25 V VC @ 1 A; 150 W rating and 0.5 pF capacitance | Optimized for ultra-high-speed RF lines (e.g., antenna switches); insufficient for 500 W surge handling in industrial I/O | Choose only for low-capacitance, low-energy ESD-only scenarios - not for EFT or lightning surge protection |
Compared with SMAJ12A and SP1003-010, SM8LC12E3/TR13 uniquely delivers dual-line SO-8 integration, 25 pF capacitance, and 500 W surge capability - making it the only option among the three qualified for simultaneous ESD/EFT/lightning protection of differential industrial buses without layout compromise.
Availability
SM8LC12E3/TR13 is available at Aetrix Electronics and suitable for RS-485 industrial networks, automotive CAN FD gateways, and USB 2.0 host ports requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for SM8LC12E3/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 (acquired by Microchip Technology in 2018) 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 SM8LCXX series was designed specifically for board-level transient suppression in harsh electromagnetic environments - targeting I/O protection of microprocessors, transceivers, and memory interfaces where ESD, EFT, and secondary lightning surges coexist.
FAQ
What is the standoff voltage rating of SM8LC12E3/TR13, and why is it critical for circuit protection?
The SM8LC12E3/TR13 has a 12 V standoff voltage (VWM), meaning it remains non-conductive below this DC or continuous peak voltage. This rating is critical because selecting a TVS with VWM ≥ the protected line's maximum operating voltage prevents leakage current and false triggering during normal operation - ensuring SM8LC12E3/TR13 only activates during actual transients like ESD or EFT events.
Does SM8LC12E3/TR13 meet IEC 61000-4-2 and IEC 61000-4-4 standards, and what test levels does it support?
Yes, SM8LC12E3/TR13 is characterized for compliance with IEC 61000-4-2 (ESD immunity) at ±15 kV contact and ±20 kV air discharge, and IEC 61000-4-4 (EFT) at 4 kV severity level. These ratings are validated per the manufacturer's test report MSC0333A.PDF and confirm SM8LC12E3/TR13's suitability for industrial and automotive applications requiring Level 4 immunity.
How many protected lines does SM8LC12E3/TR13 support, and how are they configured?
SM8LC12E3/TR13 protects two bidirectional data or interface lines using an integrated dual-channel architecture. Pins 1–2 form one channel and Pins 3–4 form the second, with both cathodes internally tied to enable shared grounding - allowing compact protection of differential pairs like RS-485 A/B or CAN H/L without external components.
What is the clamping voltage of SM8LC12E3/TR13 at 5 A, and how does it protect downstream ICs?
The clamping voltage of SM8LC12E3/TR13 is 24 V at 5 A (per Figure 2 in MSC0333A.PDF). During a high-current surge, this value defines the maximum voltage imposed on the protected line - ensuring sensitive 3.3 V or 5 V logic devices (e.g., microcontrollers or transceivers) experience no more than 24 V, well below destructive thresholds, while SM8LC12E3/TR13 safely shunts excess energy to ground.
Is SM8LC12E3/TR13 compatible with automated SMT assembly, and what packaging format is supplied?
Yes, SM8LC12E3/TR13 is supplied in EIA-481-1-A compliant tape-and-reel format (13-inch reel, 2,500 pieces), optimized for pick-and-place machines. Its SO-8 gull-wing lead geometry, defined pin #1 dot marking, and JEDEC-standard footprint ensure reliable placement and reflow soldering - making SM8LC12E3/TR13 fully compatible with high-volume SMT production lines.
SM8LC12E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- TVSarray™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 25pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SM8LC12E3/TR13 FAQ
1.How can I place an order for SM8LC12E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8LC12E3/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 SM8LC12E3/TR13 reliable?
The price and inventory of SM8LC12E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8LC12E3/TR13 is usually 5 days.
3.What payment methods are accepted for SM8LC12E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8LC12E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8LC12E3/TR13?
SM8LC12E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8LC12E3/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 SM8LC12E3/TR13?
For technical support, including SM8LC12E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8LC12E3/TR13 requirements.
6.How does Aetrix verify that SM8LC12E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SM8LC12E3/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 SM8LC12E3/TR13 meets industry standards.
7.What is the process for return or replacement of SM8LC12E3/TR13?
All SM8LC12E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SM8LC12E3/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 SM8LC12E3/TR13 part is unused and in its original packaging.
Return procedure for SM8LC12E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8LC12E3/TR13 Tags
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