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Microchip Technology SM8LC05/TR7
- Part No.:
- SM8LC05/TR7
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SM8LC05/TR7.pdf
- Description:
- TVS DIODE 5VWM 11VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:233
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Product details
Overview
SM8LC05/TR7 from Microsemi (now Microchip) is a bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 500 W peak pulse power (8/20 µs), 5.0 V standoff voltage (VWM), and 9.8 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 interfaces.
For engineers reviewing the SM8LC05/TR7 datasheet, SM8LC05/TR7 pinout, SM8LC05/TR7 application, or SM8LC05/TR7 equivalent, key selection criteria include verified 5.0 V working voltage compatibility with 5 V logic systems, low 25 pF line-to-line capacitance for high-speed data integrity, and SO-8 footprint suitability for USB 2.0, RS-485, and parallel bus protection layouts.
Technical Context
The SM8LC05/TR7 implements a dual-channel, symmetrical TVS structure with electrically isolated lines-each channel consists of back-to-back avalanche diodes enabling bidirectional clamping without polarity dependence. Its 5.0 V VWM ensures compatibility with standard 5 V TTL/CMOS I/O rails while maintaining margin above typical 4.5–5.5 V supply tolerances.
Clamping occurs at 9.8 V (1 A) and 11 V (5 A), limiting transient overvoltage to safe levels for downstream HCMOS, HSIC, and SRAM interface circuitry. The device operates across –55 °C to +150 °C and exhibits +1 mV/°C temperature coefficient of VBR, supporting stable performance in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 5.0 V - Matches nominal 5 V digital logic supply; prevents false triggering during normal operation |
| Breakdown Voltage (VBR @ 1 mA) | 6.0 V min - Ensures reliable avalanche conduction onset just above operating rail |
| Clamping Voltage (VC @ 1 A) | 9.8 V - Limits transient voltage to safe level for 5 V CMOS/TTL input stages |
| Peak Pulse Power (8/20 µs) | 500 W - Sustains IEC 61000-4-5 Level 3 (1 kV line-to-ground) surges |
| Line-to-Line Capacitance | 25 pF - Enables use on USB 2.0 full-speed (12 Mbps) and RS-485 buses without signal distortion |
| Operating Temperature Range | –55 °C to +150 °C - Qualified for under-hood automotive and industrial motor drive PCBs |
| Leakage Current @ VWM | 40 µA max - Minimizes standby power loss and avoids loading of high-impedance I/O nodes |
Pinout & Package
SO-8 surface-mount package (JEDEC MS-012AC), 5.00 mm × 4.01 mm × 1.75 mm body, gull-wing leads, pin #1 identified by dot marking. RoHS-compliant, tape-and-reel packaging (2500 pcs/reel, EIA-481-1-A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode of Channel 1 | Connects to protected line A; forms one half of bidirectional clamp pair |
| 2 | Cathode of Channel 1 | Connects to common ground or reference plane; completes first TVS path |
| 3 | Anode of Channel 2 | Connects to protected line B; independent bidirectional path for second I/O |
| 4 | Cathode of Channel 2 | Ground return for second channel; electrically isolated from Pin 2 per datasheet |
| 5–8 | NC / Thermal Pad | No internal connection; pins 5–8 are unused terminals per MSC0333A layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional dual-line protection | Two independent, isolated TVS paths enable simultaneous protection of differential or separate single-ended I/O lines without crosstalk |
| IEC 61000-4-2 ESD compliance | Withstands ±15 kV contact discharge-meets industrial and medical equipment immunity requirements |
| Low 25 pF capacitance | Preserves signal edge rate and eye diagram integrity on 12–50 Mbps serial buses (e.g., UART, SPI, CAN) |
| High-temperature operation | Rated to +150 °C ambient-supports placement near power MOSFETs, DC-DC converters, or motor drivers |
| SO-8 footprint compatibility | Replaces discrete dual-diode solutions with identical land pattern, reducing PCB area and assembly cost |
Applications
| USB 2.0 Full-Speed Interface | Industrial RS-485 Transceiver Port |
|---|---|
Use Scenario: Protecting D+ and D− lines of embedded USB peripherals against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Bidirectional TVS array clamping transients before they reach the USB PHY IC's ESD-sensitive input structures. Use Value: Maintains 25 pF capacitance per line to preserve 480 Mbps signaling integrity while suppressing ±15 kV contact discharges. | Use Scenario: Safeguarding RS-485 driver/receiver terminals in factory automation PLCs exposed to cable-induced surges and ground differentials. IC Role / Device Role / Timing Role: Dual-channel transient suppressor absorbing IEC 61000-4-4 EFT bursts (4 kV, 5 kHz) on A/B differential pairs. Use Value: 500 W peak power rating handles repetitive fast transients without degradation; 9.8 V clamping protects ISO3082-level receivers. |
| Automotive Body Control Module I/O | Embedded Microprocessor Parallel Bus |
Use Scenario: Shielding LIN bus or sensor input lines in BCMs subjected to load dump and ISO 7637-2 pulse 1/2/5a transients. IC Role / Device Role / Timing Role: Board-level TVS array placed at connector entry point to shunt energy before reaching MCU GPIOs. Use Value: –55 °C to +150 °C rating supports under-dash mounting; 5.0 V VWM aligns with 5 V sensor supply rails. | Use Scenario: Protecting address/data bus lines between microcontroller and external SRAM/Flash in industrial HMIs. IC Role / Device Role / Timing Role: Dual-line suppressor guarding parallel bus segments against ESD from operator touch or relay switching noise. Use Value: Electrically isolated channels prevent coupling between adjacent data bits; 40 µA leakage avoids bus contention in high-Z states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Single-line, unidirectional, DO-214AC package; 600 W peak power; 5.0 V VWM; higher 12.5 V clamping at 1 A | Requires two devices and additional routing for dual-line protection; lacks integrated isolation | Use when space allows discrete placement and unidirectional clamping suffices |
| SP1003-050 | Quad-channel, 5.0 V VWM, 12 pF capacitance, SOT-23-6; lower 300 W peak power; ±30 kV ESD rating | Higher channel density but lower surge robustness; optimized for ultra-low-capacitance USB 3.0, not 500 W EFT | Prefer for compact, high-speed designs where 500 W surge capability is secondary to capacitance |
Compared with SMAJ5.0A and SP1003-050, the SM8LC05/TR7 uniquely delivers dual-line bidirectional clamping, 500 W surge handling, and SO-8 integration in a single component-reducing BOM count and PCB area while meeting stringent IEC 61000-4-2/4-4 requirements for industrial and automotive interfaces.
Availability
SM8LC05/TR7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial RS-485 port hardening, and automotive body control module I/O safeguarding requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SM8LC05/TR7 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 TVS array product line was engineered specifically for board-level transient suppression in harsh electromagnetic environments-targeting ESD-prone I/O interfaces in automotive ECUs, industrial PLCs, and medical diagnostic equipment.
FAQ
What is the standoff voltage rating of the SM8LC05/TR7 and how does it relate to 5 V logic systems?
The SM8LC05/TR7 has a 5.0 V standoff voltage (VWM), meaning it remains non-conductive below this threshold. This matches standard 5 V TTL/CMOS logic rails and provides sufficient margin above typical 4.5–5.5 V supply tolerances-ensuring the SM8LC05/TR7 does not interfere with normal operation while reliably triggering during ESD or surge events exceeding 6.0 V breakdown.
Does the SM8LC05/TR7 support bidirectional transient suppression on both protected lines?
Yes-the SM8LC05/TR7 integrates two independent, symmetrical TVS structures in a single SO-8 package. Each channel uses back-to-back diodes to clamp positive and negative transients equally, enabling true bidirectional protection for differential signals like USB D+/D− or RS-485 A/B without polarity constraints. Pins 1–2 and 3–4 operate as separate, isolated paths.
What is the maximum clamping voltage of the SM8LC05/TR7 at 5 A, and why does that matter for system design?
The SM8LC05/TR7 clamps to 11 V at 5 A (8/20 µs pulse), per Figure 2 in MSC0333A.PDF. This value defines the worst-case overvoltage imposed on downstream circuitry during a high-energy surge. Designers use it to verify that connected ICs-such as 5 V microcontrollers or transceivers-have absolute maximum input ratings exceeding 11 V, ensuring survivability under IEC 61000-4-5 Level 3 stress conditions.
How does the 25 pF capacitance of the SM8LC05/TR7 affect high-speed data lines like USB or RS-485?
The SM8LC05/TR7's 25 pF line-to-line capacitance is measured at 1 MHz and 0 V bias. At USB 2.0 full-speed (12 Mbps), this adds negligible rise-time degradation (<1 ns) and preserves signal integrity within specification. For RS-485, it remains well below the 50 pF limit recommended for 10 Mbps operation-making the SM8LC05/TR7 suitable for both protocols without equalization or bandwidth compensation.
Is the SM8LC05/TR7 qualified for automotive under-hood applications?
Yes-the SM8LC05/TR7 is specified for operation from –55 °C to +150 °C and meets IEC 61000-4-2 (ESD), -4-4 (EFT), and secondary lightning surge standards. Its SO-8 package, thermal stability, and 5.0 V VWM make it appropriate for body control modules, sensor interfaces, and LIN bus protection in under-hood environments where ambient temperatures exceed 125 °C.
SM8LC05/TR7 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):
- 5V
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 11V
- 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
SM8LC05/TR7 FAQ
1.How can I place an order for SM8LC05/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8LC05/TR7 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 SM8LC05/TR7 reliable?
The price and inventory of SM8LC05/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8LC05/TR7 is usually 5 days.
3.What payment methods are accepted for SM8LC05/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8LC05/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8LC05/TR7?
SM8LC05/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8LC05/TR7 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 SM8LC05/TR7?
For technical support, including SM8LC05/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8LC05/TR7 requirements.
6.How does Aetrix verify that SM8LC05/TR7 is sourced from the original manufacturer or authorized distributors?
All SM8LC05/TR7 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 SM8LC05/TR7 meets industry standards.
7.What is the process for return or replacement of SM8LC05/TR7?
All SM8LC05/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with SM8LC05/TR7, 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 SM8LC05/TR7 part is unused and in its original packaging.
Return procedure for SM8LC05/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8LC05/TR7 Tags
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