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Taiwan Semiconductor Corporation 1.5SMC39C
- Part No.:
- 1.5SMC39C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39C.pdf
- Description:
- 1500W, 39V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,942
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Product details
Overview
1.5SMC39C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 39V breakdown voltage (min 35.1V, max 42.9V), 1500W peak pulse power rating, 56.4V maximum clamping voltage at 27A peak impulse current, and DO-214AB (SMC) package. It is used to protect Ethernet PHYs, USB ports, and industrial I/O interfaces against ESD and lightning-induced transients.
For engineers reviewing the 1.5SMC39C datasheet, 1.5SMC39C pinout, 1.5SMC39C application, or 1.5SMC39C equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, unidirectional vs. bidirectional polarity requirements, thermal derating above 25°C ambient, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b waveforms.
Technical Context
The 1.5SMC39C operates as a bidirectional avalanche diode, conducting symmetrically in both polarities once the reverse standoff voltage (VWM = 31.6V) is exceeded. Its glass-passivated junction enables fast response (<1.0 ps) and low leakage (<1 µA at VWM), critical for preserving signal integrity in high-speed interfaces.
Thermally, it exhibits RθJA = 50°C/W and RθJC = 15°C/W, supporting sustained operation up to TJ = +150°C. Its 1.0 mA test current (IT) and 0.100%/°C VBR temperature coefficient ensure stable breakdown behavior across automotive and industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 35.1 V / 42.9 V - defines minimum overvoltage threshold and worst-case clamping headroom at rated test current |
| VWM | 31.6 V - maximum continuous DC or RMS operating voltage before significant leakage begins |
| VC@IPPM | 56.4 V at 27 A - peak clamped voltage during 10/1000 µs surge, limiting stress on downstream ICs |
| PPK | 1500 W - peak pulse power handling per single 10/1000 µs waveform, per Fig.5 |
| IPPM | 27 A - maximum non-repetitive surge current the device can safely clamp without failure |
| TJ max | +150 °C - maximum junction temperature, enabling use in under-hood or enclosed industrial environments |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.210 g mass and J-STD-002 solderability |
Pinout & Package
Package: DO-214AB (SMC), molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation uses symmetrical marking; no anode/cathode distinction required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | Both terminals function identically; no polarity dependency-enables placement without orientation check |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides heat dissipation path to PCB copper and mechanical mounting stability |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, audio) without external polarity management |
| 1500 W peak pulse rating | Withstands ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2b (battery disconnect), and Pulse 3a/b (switching noise) without degradation |
| Clamping voltage ≤56.4 V | Provides ≥12.6 V margin below typical 69 V absolute maximum rating of 3.3 V/5 V logic I/O pins, preventing latch-up or oxide rupture |
| Fast response <1.0 ps | Activates before transient energy couples into protected circuitry-critical for sub-nanosecond ESD events per IEC 61000-4-2 |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow; supports standard SMT assembly without special handling |
Applications
| Industrial I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V PLC analog input channels from field-wiring induced surges and relay coil flyback. IC Role / Device Role: Primary overvoltage clamp placed between signal line and ground, upstream of precision ADC front-end. Use Value: Limits transient voltage to ≤56.4 V, preserving 24 V system compatibility while maintaining <1 µA leakage at normal operating voltage. |
Use Scenario: Safeguarding LIN bus transceivers against battery load dump and alternator ripple in door module ECUs. IC Role / Device Role: Bidirectional TVS connected across LIN data pair (LIN_H/L) to suppress common-mode transients. Use Value: Meets ISO 7637-2 Pulse 2a (100 V/50 ms) and Pulse 5a (75 V/400 ms) requirements with no additional filtering components. |
| USB 2.0 Data Line Protection | RS-485 Transceiver Interface |
Use Scenario: Shielding USB D+/D− lines from ESD events during hot-plug insertion in consumer docking stations. IC Role / Device Role: Low-capacitance bidirectional clamp placed differential across D+/D−, referenced to ground. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) while adding <1 pF parasitic capacitance-no signal integrity impact at 480 Mbps. |
Use Scenario: Protecting half-duplex RS-485 transceivers in factory automation networks exposed to motor drive noise and ground potential differences. IC Role / Device Role: Bidirectional TVS installed between A/B differential pair and local ground plane. Use Value: Handles repetitive 1 kV/500 A surge pulses (IEC 61000-4-5) without parameter shift, ensuring long-term communication reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | Lower peak power (600 W), higher VC (58.1 V), same DO-214AA (SMB) footprint | Not suitable for ISO 7637-2 Pulse 1 or high-current lightning surges; limited to lower-energy ESD-only zones | Select when board space is constrained and surge threat level is Class 2 (IEC 61000-4-2 only), not automotive/load-dump scenarios |
| 1.5KE39CA | Through-hole TO-204AE (DO-41), identical electrical specs but larger thermal mass and manual assembly requirement | Used where automated SMT is unavailable or where higher thermal inertia improves reliability in high-ambient-temperature enclosures | Choose for legacy designs requiring through-hole compatibility or where PCB layout prohibits SMC footprint |
Compared with 1.5SMC39C, SMBJ36CA offers smaller size but reduced surge robustness, while 1.5KE39CA delivers identical protection with manual assembly overhead and larger board area-making 1.5SMC39C optimal for automated, high-reliability SMT deployments.
Availability
1.5SMC39C is available at Aetrix Electronics and suitable for industrial I/O protection, automotive body electronics, USB interface hardening, and RS-485 network node design requiring stable component supply and full ISO 7637-2 compliance.
Supply support for 1.5SMC39C 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q200 qualified product lines.
The 1.5SMCxxC series was developed specifically for high-power, surface-mount transient suppression in automotive and industrial control systems-emphasizing bidirectional symmetry, low clamping ratio, and robust thermal performance in compact SMC packages.
FAQ
What is the polarity configuration of the 1.5SMC39C?
The 1.5SMC39C is a bidirectional TVS diode, meaning it conducts equally in both forward and reverse directions once the breakdown voltage is exceeded. Its DO-214AB package has no functional anode or cathode designation-both terminals are electrically identical, simplifying PCB layout and eliminating orientation errors during automated placement.
Does the 1.5SMC39C meet automotive surge immunity standards?
Yes, the 1.5SMC39C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), Pulse 2b (supply line interruption), and Pulses 3a/3b (capacitive coupling and switching noise). Its 1500 W peak power rating and 56.4 V clamping voltage enable direct compliance in 12 V and 24 V vehicle subsystems without additional components.
How does the 1.5SMC39C compare to unidirectional variants like 1.5SMC39A?
The 1.5SMC39C differs from 1.5SMC39A in polarity: "C" denotes bidirectional operation, while "A" indicates unidirectional. The 1.5SMC39C has identical VBR (35.1–42.9 V), VWM (31.6 V), and VC (56.4 V) ratings but supports symmetrical clamping-making it suitable for AC signals or floating buses where polarity reversal may occur, unlike 1.5SMC39A which only protects against reverse-polarity transients.
What is the maximum allowable PCB trace length when using the 1.5SMC39C for ESD protection?
For optimal ESD performance per IEC 61000-4-2, PCB trace inductance must be minimized: keep traces from 1.5SMC39C to protected node and to ground plane under 5 mm total loop length. Longer paths increase impedance, delaying clamping response and allowing transient energy to couple into sensitive circuitry before the 1.5SMC39C activates.
Is the 1.5SMC39C RoHS and halogen-free compliant?
Yes, the 1.5SMC39C is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and its matte tin-plated leads satisfy J-STD-002 solderability requirements-ensuring environmental compliance and process compatibility in modern lead-free reflow profiles.
1.5SMC39C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 31.6V
- Voltage - Breakdown (Min):
- 35.1V
- Voltage - Clamping (Max) @ Ipp:
- 56.4V
- Current - Peak Pulse (10/1000µs):
- 27A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC39C FAQ
1.How can I place an order for 1.5SMC39C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39C 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 1.5SMC39C reliable?
The price and inventory of 1.5SMC39C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC39C is usually 5 days.
3.What payment methods are accepted for 1.5SMC39C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39C?
1.5SMC39C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39C 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 1.5SMC39C?
For technical support, including 1.5SMC39C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39C requirements.
6.How does Aetrix verify that 1.5SMC39C is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39C 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 1.5SMC39C meets industry standards.
7.What is the process for return or replacement of 1.5SMC39C?
All 1.5SMC39C units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39C, 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 1.5SMC39C part is unused and in its original packaging.
Return procedure for 1.5SMC39C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39C Tags
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