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Taiwan Semiconductor Corporation 1.5SMC39A
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- Part No.:
- 1.5SMC39A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39A.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
1.5SMC39A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust ESD and surge protection in DC power rails and signal lines. It features a 39V breakdown voltage (37.1–41.0V), 33.3V working stand-off voltage, 53.9V clamping voltage at 29A peak pulse current, and 1500W peak pulse power dissipation in a DO-214AB (SMC) package - deployed in telecom power supplies and industrial I/O interfaces.
For engineers reviewing the 1.5SMC39A datasheet, 1.5SMC39A pinout, 1.5SMC39A application, or 1.5SMC39A equivalent, key selection criteria include clamping performance under 8/20μs surges, leakage current below 1μA at VWM, thermal resistance (RθJA = 50°C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive-grade transient immunity.
Technical Context
The 1.5SMC39A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1ps response time and stable breakdown characteristics across -55°C to +150°C. Its clamping behavior is defined by a 10/1000μs double-exponential waveform per R.E.A., with guaranteed VC ≤ 53.9V at IPPM = 29A.
Thermally, it delivers RθJC = 15°C/W and RθJA = 50°C/W, enabling reliable operation up to 150°C junction temperature. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 37.1V / 41.0V - ensures consistent avalanche initiation above 33.3V operating rail, minimizing false triggering |
| VWM | 33.3V - maximum continuous reverse voltage before significant leakage; sets safe DC operating margin |
| VC@IPPM | 53.9V at 29A - limits protected circuit voltage during 8/20μs transients, preserving downstream ICs |
| PPK | 1500W - handles high-energy surges (e.g., ISO 7637-2 Pulse 1, 2b) without failure |
| IR@VWM | <1μA - negligible standby power loss and minimal impact on high-impedance sensing nodes |
| TJ max | +150°C - supports operation in enclosed industrial enclosures or under PCB self-heating |
| RθJA | 50°C/W - enables thermal design with standard 1-in² copper pour; derates linearly above 25°C ambient |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-die unidirectional configuration. Cathode indicated by molded band; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path for surge current | Connected to system ground or low-impedance return plane; carries full IPPM during clamping |
| Cathode | Protected line connection | Connected to input rail or signal line; voltage referenced to anode during transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift over temperature and life cycles |
| Sub-1ps response time | Clamps ESD events (IEC 61000-4-2) before sensitive logic states are corrupted |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
| MSL Level 1 | Zero floor-life limitation - can be mounted directly from dry pack without baking |
Applications
| Telecom Power Input Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 24V DC power inputs in VoIP gateways and base station backhaul units from lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground, absorbing energy before it reaches DC-DC converters. Use Value: Limits rail voltage to ≤53.9V during 1500W surges, preventing damage to upstream rectifiers and downstream regulators. | Use Scenario: Safeguarding 24V digital input channels in programmable logic controllers against field-wiring faults and relay coil flyback. IC Role / Device Role / Timing Role: Standoff protection element on each isolated input channel, shunting transients to common reference ground. Use Value: Maintains <1μA leakage at 33.3V, avoiding false triggering of optocoupler-based input detection circuits. |
| Automotive Body Control Module | Consumer Appliance Motor Drive Supply |
Use Scenario: Suppressing load-dump pulses (ISO 7637-2 Pulse 5a) on 12V supply lines feeding BCM microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT rail, coordinated with upstream fuses and secondary LC filtering. Use Value: Clamps 12V rail to ≤53.9V within nanoseconds, meeting stringent automotive EMC immunity requirements. | Use Scenario: Protecting 36V DC bus in smart washing machine motor drives from inductive kickback during MOSFET switching. IC Role / Device Role / Timing Role: Rail-level surge suppressor placed adjacent to H-bridge power stage, referenced to local ground plane. Use Value: Withstands 29A peak impulse without degradation, enabling reliable operation across 100,000+ motor start-stop cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A (Bourns) | Lower PPK = 600W; VBR = 40.0–44.2V; DO-214AA (SMB) package | Not suitable for 1500W ISO 7637-2 Pulse 2b; limited to lower-energy consumer-grade transients | Select only when board space constraints require smaller SMB footprint and surge energy is ≤600W |
| SMCJ36A (Littelfuse) | Identical PPK = 1500W and DO-214AB (SMC) package; VBR = 38.0–42.0V; tighter VC = 58.1V @ 26A | Higher clamping voltage reduces margin for 3.3V/5V logic protection; same thermal profile | Acceptable where 58.1V clamping is acceptable and second-source qualification is required |
Compared with 1.5SMC39A, SMBJ36A offers reduced surge handling and smaller package, while SMCJ36A matches power rating but clamps 4.2V higher - making 1.5SMC39A optimal for designs requiring lowest possible VC at full 1500W rating.
Availability
1.5SMC39A is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive body electronics requiring stable component supply and full ISO 7637-2 compliance.
Supply support for 1.5SMC39A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The 1.5SMC series was engineered for high-reliability surface-mount surge suppression in harsh environments, targeting automotive, industrial, and telecom applications demanding repeatable clamping and MSL Level 1 assembly compatibility.
FAQ
What is the breakdown voltage range for the 1.5SMC39A?
The 1.5SMC39A has a guaranteed breakdown voltage range of 37.1V to 41.0V at 1.0mA test current (VBR min/max), measured per ANSI/IEEE C62.35. This tight tolerance ensures predictable turn-on behavior across production lots and temperature extremes, critical for maintaining protection margins in 33V-class systems.
Is the 1.5SMC39A unidirectional or bidirectional?
The 1.5SMC39A is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. Its cathode band marking indicates orientation, and it conducts only during reverse-biased transients. For AC or bipolar signal lines, a 1.5SMC39CA variant would be required - the "A" suffix denotes enhanced VBR tolerance, not polarity change.
What is the maximum clamping voltage of the 1.5SMC39A under surge conditions?
The 1.5SMC39A clamps to a maximum of 53.9V at 29A peak pulse current (IPPM) using the standardized 10/1000μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during worst-case transients, directly informing system-level overvoltage design margins.
Does the 1.5SMC39A meet automotive transient standards?
Yes, the 1.5SMC39A is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its 1500W peak power rating and sub-1ps response enable robust suppression of load-dump, inductive switching, and coupling-induced transients encountered in 12V and 24V automotive subsystems.
What is the thermal resistance of the 1.5SMC39A, and how does it affect layout?
The 1.5SMC39A has a junction-to-ambient thermal resistance (RθJA) of 50°C/W under standard JEDEC test conditions. To maintain TJ ≤ 150°C, PCB layout must provide ≥1 in² of 2-oz copper connected to both terminals; reducing copper area increases thermal impedance and requires derating of surge capability per Fig.2 in the datasheet.
1.5SMC39A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 29A
- 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)
1.5SMC39A FAQ
1.How can I place an order for 1.5SMC39A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39A 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 1.5SMC39A reliable?
The price and inventory of 1.5SMC39A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC39A is usually 5 days.
3.What payment methods are accepted for 1.5SMC39A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39A?
1.5SMC39A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39A 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 1.5SMC39A?
For technical support, including 1.5SMC39A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39A requirements.
6.How does Aetrix verify that 1.5SMC39A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39A 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 1.5SMC39A meets industry standards.
7.What is the process for return or replacement of 1.5SMC39A?
All 1.5SMC39A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39A, 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 1.5SMC39A part is unused and in its original packaging.
Return procedure for 1.5SMC39A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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