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STMicroelectronics SMCJ15A-TR
- Part No.:
- SMCJ15A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ15A-TR.pdf
- Description:
- TVS DIODE 15VWM 32.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,966
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Product details
Overview
SMCJ15A-TR from STMicroelectronics is a unidirectional 1500 W transient voltage suppression (TVS) diode in SMC package, designed for primary-level ESD and surge protection on DC power rails and signal lines. It features a 15 V standoff voltage (VRM), 16.7–17.6 V breakdown voltage (VBR) at 1 mA, 24.4 V clamping voltage (VCL) at 64 A (10/1000 µs), 0.2 µA leakage at 25 °C, and operates up to +150 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMCJ15A-TR datasheet, SMCJ15A-TR pinout, SMCJ15A-TR application, or SMCJ15A-TR equivalent, key selection criteria include clamping voltage under 64 A surge, low leakage for battery-backed circuits, thermal derating above 25 °C, and compatibility with IPC7531-compliant SMC footprints for high-reliability PCB layouts.
Technical Context
This unidirectional TVS diode uses planar silicon junction technology to achieve low dynamic resistance (92 mΩ at 25 °C), fast response time (<1 ns), and stable clamping performance across -55 °C to +150 °C operating range. Its IEC 61000-4-2 compliance (30 kV air/contact discharge) and IEC 61000-4-4 level 4 rating (4 kV) confirm suitability for harsh EMC environments.
The device exhibits predictable thermal derating: peak pulse power drops from 1500 W at 25 °C to ~1250 W at 150 °C (10/1000 µs), and its voltage parameters scale linearly with junction temperature using αT = 10⁻⁴/°C - enabling accurate system-level surge margin calculation under real thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 15 V - maximum continuous reverse working voltage before leakage exceeds 0.2 µA; sets upper limit for protected line voltage. |
| Breakdown Voltage (VBR) | 16.7–17.6 V at 1 mA - precise threshold where avalanche conduction begins; ensures reliable triggering without false trips. |
| Clamping Voltage (VCL) | 24.4 V at 64 A (10/1000 µs) - maximum voltage seen by downstream circuit during worst-case surge; defines protection margin. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - energy-handling capacity for standard lightning surges; validated per IEC 61000-4-5. |
| Leakage Current (IRM) | 0.2 µA at 25 °C - ultra-low off-state current critical for low-power and battery-operated systems. |
| Junction Temperature Range | -55 to +150 °C - enables deployment in under-hood automotive, industrial motor drives, and outdoor power electronics. |
| Package | SMC (DO-214AB) - JEDEC-registered surface-mount outline with 7.75–8.15 mm body width; supports automated assembly and thermal relief via copper pour. |
Pinout & Package
SMCJ15A-TR is a two-terminal unidirectional TVS diode in SMC (DO-214AB) package. Cathode is marked by a band on the body; anode connects to PCB ground or return path. The SMC outline provides mechanical robustness and thermal dissipation capability suitable for high-energy transients.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Return path / ground reference | Connected to system ground plane; carries full surge current back to source during clamping event. |
| Cathode (banded end) | Protected line input | Connected to line being protected (e.g., 12 V rail); avalanche conduction occurs between cathode and anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | 30 kV contact & air discharge - exceeds Level 4, eliminating need for external ESD staging in front-end interfaces. |
| Low dynamic resistance | 92 mΩ at 25 °C - minimizes VCL rise under high-current surges, preserving safe operating area for downstream ICs. |
| High-temperature operation | Rated to +150 °C junction - maintains clamping integrity in thermally constrained enclosures without derating penalties. |
| UL94 V0 epoxy housing | Flame-retardant encapsulation - satisfies safety requirements for industrial and transportation equipment certifications. |
| ECOPACK® RoHS-compliant | Lead-free matte tin plating - compatible with Pb-free reflow profiles (peak 240–245 °C) and long-term reliability testing. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge clamp on bulk input rail; absorbs 1500 W transients within <1 ns to prevent MOSFET gate oxide failure. Use Value: Clamps to 24.4 V at 64 A, limiting stress on upstream rectifier and downstream DC-DC converter to safe levels per IEC 61000-4-5. |
Use Scenario: CAN_H/CAN_L lines in BCM subjected to ESD events during connector mating/unmating in vehicle assembly. IC Role / Device Role / Timing Role: Unidirectional TVS on each CAN line referenced to chassis ground; suppresses ±30 kV ESD per IEC 61000-4-2 without disrupting 1 Mbps signaling. Use Value: 0.2 µA leakage preserves bus biasing integrity; low capacitance (<100 pF at 15 V) avoids signal edge degradation at high data rates. |
| Telecom AC/DC Adapter Surge Protection | Smart Meter DC Rail Protection |
|
Use Scenario: Secondary-side 12 V output of isolated AC/DC adapter used in base station remote radio units. IC Role / Device Role / Timing Role: Final-stage transient suppressor before LDO regulator; handles repetitive 10/1000 µs surges induced by nearby lightning strikes. Use Value: 1500 W rating and 1250 W capability at 150 °C ensure sustained protection during extended high-ambient operation without thermal runaway. |
Use Scenario: 3.3 V and 5 V internal rails in utility smart meters installed in outdoor meter cabinets with wide ambient swings. IC Role / Device Role / Timing Role: Low-leakage TVS on microcontroller I/O and RTC backup lines; prevents latch-up from electrostatic coupling in humid environments. Use Value: Sub-microamp leakage at 25 °C and stable VBR over temperature enable decade-long battery backup life without parasitic drain. |
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-TR | Lower PPP (600 W), same VRM/VBR/VCL, SMB package (smaller footprint, lower thermal mass) | Limited to lower-energy surges; unsuitable for IEC 61000-4-5 line surges requiring ≥1000 W | Select only for space-constrained designs with verified <600 W surge exposure. |
| 1.5KE15A | Through-hole DO-201 package, identical electrical specs but higher thermal resistance (RθJA ≈ 15 °C/W vs. SMC's ~10 °C/W) | Requires larger PCB area and manual assembly; less suitable for high-volume automated production | Prefer for legacy through-hole designs or prototyping where rework tolerance is prioritized over density. |
Compared with SMBJ15A-TR and 1.5KE15A, SMCJ15A-TR delivers optimal balance of high-energy handling (1500 W), surface-mount scalability, and thermal robustness - making it the preferred choice for new industrial and automotive designs demanding IPC7531-compliant layout and IEC 61000-4-4/5 compliance.
Availability
SMCJ15A-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and smart metering systems requiring stable component supply across multi-year production cycles.
Supply support for SMCJ15A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and automotive-grade components with vertical manufacturing control.
SMCJ series TVS diodes belong to ST's high-reliability protection portfolio, engineered specifically for mission-critical surge immunity in industrial automation, automotive electronics, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of SMCJ15A-TR under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 24.4 V at 64 A for a 10/1000 µs waveform, measured at 25 °C junction temperature. This value increases linearly with temperature at αT = 10⁻⁴/°C, reaching ~25.6 V at 150 °C - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings during surge events.
Is SMCJ15A-TR bidirectional or unidirectional?
SMCJ15A-TR is unidirectional, meaning it conducts only in reverse-bias avalanche mode and must be oriented with cathode toward the protected line. Its counterpart SMCJ15CA-TR is bidirectional and used for AC or differential signal protection where polarity reversal occurs.
Can SMCJ15A-TR be used in lead-free reflow processes?
Yes - SMCJ15A-TR features matte tin-plated leads and complies with J-STD-020 MSL Level 1. It supports ST's recommended Pb-free reflow profile with peak temperature of 240–245 °C for ≤60 seconds, matching IPC/JEDEC standards for high-reliability assembly.
How does leakage current change with temperature?
Leakage current rises exponentially with junction temperature: from 0.2 µA at 25 °C to ~1000 nA at 125 °C and ~10,000 nA at 150 °C (per Figure 9). This behavior is inherent to silicon PN junctions and must be factored into battery-life calculations for always-on systems.
SMCJ15A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- 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:
- 32.5V
- Current - Peak Pulse (10/1000µs):
- 308A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMCJ15A-TR FAQ
1.How can I place an order for SMCJ15A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ15A-TR 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-TR reliable?
The price and inventory of SMCJ15A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ15A-TR is usually 5 days.
3.What payment methods are accepted for SMCJ15A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ15A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ15A-TR?
SMCJ15A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ15A-TR 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-TR?
For technical support, including SMCJ15A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ15A-TR requirements.
6.How does Aetrix verify that SMCJ15A-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ15A-TR 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-TR meets industry standards.
7.What is the process for return or replacement of SMCJ15A-TR?
All SMCJ15A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ15A-TR, 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-TR part is unused and in its original packaging.
Return procedure for SMCJ15A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ15A-TR Tags
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