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Taiwan Semiconductor Corporation SMCJ15A
- Part No.:
- SMCJ15A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ15A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,320
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Product details
Overview
SMCJ15A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 15V working stand-off voltage (VWM), 16.7–18.5V breakdown voltage (VBR), and 24.4V maximum clamping voltage (VC) at 64A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ15A datasheet, SMCJ15A pinout, SMCJ15A application, or SMCJ15A equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional polarity marking, JEDEC-compliant thermal resistance (RθJC = 10°C/W), and moisture sensitivity level 1 compliance for reflow assembly.
Technical Context
The SMCJ15A employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at 15V). Its unidirectional configuration enables asymmetric protection of DC power lines with cathode-band polarity identification.
Designed for single-die operation in DO-214AB, it delivers 1500W peak pulse power (tp = 1ms) with derating above 25°C ambient per Fig.2, and supports 200A non-repetitive forward surge (8.3ms half-sine) per JESD201 Class 2 whisker-tested matte tin leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 16.7 V / 18.5 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 24.4 V - Clamped voltage across device at 64 A peak impulse, limiting downstream voltage stress |
| PPK | 1500 W - Peak pulse power handling capability for 1 ms 10/1000 μs waveform |
| RθJC | 10 °C/W - Junction-to-case thermal resistance enabling effective heat transfer to PCB copper |
| IR @ VWM | <1 μA - Reverse leakage ensures minimal standby power loss in protected circuits |
| TJ max | +150 °C - Maximum junction temperature rating supporting under-hood automotive use |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode-banded unidirectional configuration. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-potential rail; carries full surge current during clamping |
| Cathode | High-side connection point | Marked with band; connected to protected line; defines unidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Allows unlimited floor life and standard reflow without baking preconditioning |
| Fast response time <1.0 ps | Clamps transients before sensitive ICs experience overvoltage damage |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V battery-fed ECU power input subjected to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp positive-going transients above 15V. Use Value: Limits voltage to ≤24.4V during 1500W surges, preventing damage to 36V-rated LDOs and microcontrollers. | Use Scenario: 24V DC digital input channel exposed to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: TVS shunts energy from relay coil flyback into ground, protecting optocoupler input stage. Use Value: Withstands 64A peak impulse while maintaining <1μA leakage at 24V nominal, preserving signal integrity. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Sensor Interface |
Use Scenario: Constant-current LED string driver powered from 48V supply in outdoor lighting. IC Role / Device Role / Timing Role: SMCJ15A placed across output capacitor to suppress switching spikes and lightning-induced surges. Use Value: 1500W peak power rating absorbs multi-millisecond transients without thermal runaway, extending driver lifetime. | Use Scenario: RS-485 transceiver interface on factory-floor sensor node subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: Paired with bidirectional TVS (e.g., SMCJ15CA) on differential lines; SMCJ15A used on VCC-to-GND rail. Use Value: Clamps VCC rail to 24.4V during ±8kV contact ESD, preventing latch-up in transceiver bias circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A | Same VWM/VBR/VC specs but 600W PPK rating and SMB package (smaller footprint, higher RθJA) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select SMCJ15A when 1500W surge immunity is required and board space permits DO-214AB |
| P6SMB15A | 600W PPK, same DO-214AA (SMB) package; slightly higher VC (24.7V) and lower IPPM (43A) | Lower thermal mass reduces sustained surge capability; not rated for ISO 7637-2 Pulse 2b | Choose SMCJ15A for automotive-grade robustness where 1500W clamping and 10°C/W RθJC are critical |
Compared with SMBJ15A and P6SMB15A, the SMCJ15A provides 2.5× higher peak power handling and superior thermal dissipation-enabling reliable protection in high-energy automotive and industrial environments where smaller packages would thermally saturate.
Availability
SMCJ15A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, LED driver power stages, and sensor interface protection requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ15A 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, serving global automotive, industrial, and consumer markets since 1979.
The SMCJ series belongs to TSC's high-power TVS portfolio, engineered specifically for robust transient immunity in harsh environments-including under-hood automotive systems and factory automation equipment.
FAQ
What is the maximum clamping voltage of the SMCJ15A under standard test conditions?
The SMCJ15A has a maximum clamping voltage (VC) of 24.4 V at 64 A peak pulse current (IPPM) using the 10/1000 μs waveform per IEC 61000-4-5. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ15A maintains this clamping performance consistently due to its glass-passivated junction and DO-214AB thermal design.
Is the SMCJ15A suitable for bidirectional transient protection?
No-the SMCJ15A is a unidirectional TVS diode, intended only for DC line protection with defined polarity (cathode band marked). For bidirectional applications such as AC lines or differential data buses, the SMCJ15CA variant must be used. Using SMCJ15A in reverse-biased configurations risks permanent failure, as its breakdown behavior is not characterized in the reverse direction.
Does the SMCJ15A meet automotive qualification standards beyond ISO 7637-2?
Yes-the SMCJ15A complies with AEC-Q200 stress test requirements for passive components, including temperature cycling, humidity bias, and surge endurance. Its construction (glass passivation, JESD201 Class 2 whisker-tested leads, MSL Level 1) supports automotive under-hood deployment. However, full AEC-Q200 certification applies to the SMCJ15A part number specifically, not the broader SMCJ family.
What is the thermal resistance from junction to ambient (RθJA) for the SMCJ15A in standard PCB layout?
The typical junction-to-ambient thermal resistance (RθJA) for the SMCJ15A mounted on a standard FR-4 PCB with 1-inch² 2-oz copper pad is 55°C/W. This value assumes no additional heatsinking; actual RθJA improves significantly with larger copper areas or internal layers. The SMCJ15A's RθJC of 10°C/W enables efficient heat transfer to the PCB, making thermal management predictable in compact layouts.
How does the SMCJ15A compare to the SMCJ15 in terms of electrical performance?
The SMCJ15A offers tighter VBR tolerance (16.7–18.5 V) versus SMCJ15 (16.7–20.4 V), resulting in more consistent clamping onset and lower maximum VC (24.4 V vs. 26.9 V at same IPPM). Both share identical package, PPK, and thermal ratings, but SMCJ15A's tighter specification supports designs requiring precise overvoltage thresholds-such as those interfacing with 24V logic supervisors or narrow-margin power supplies.
SMCJ15A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 61.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ15A FAQ
1.How can I place an order for SMCJ15A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ15A 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 SMCJ15A reliable?
The price and inventory of SMCJ15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ15A is usually 5 days.
3.What payment methods are accepted for SMCJ15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ15A?
SMCJ15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ15A 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 SMCJ15A?
For technical support, including SMCJ15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ15A requirements.
6.How does Aetrix verify that SMCJ15A is sourced from the original manufacturer or authorized distributors?
All SMCJ15A 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 SMCJ15A meets industry standards.
7.What is the process for return or replacement of SMCJ15A?
All SMCJ15A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ15A, 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 SMCJ15A part is unused and in its original packaging.
Return procedure for SMCJ15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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