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Vishay General Semiconductor - Diodes Division SMCJ15A-M3/9AT
- Part No.:
- SMCJ15A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ15A-M3/9AT.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
SMCJ15A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 15 V stand-off voltage (VWM), 24.4 V maximum clamping voltage (VC) at 61.5 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMCJ15A-M3/9AT datasheet, SMCJ15A-M3/9AT pinout, SMCJ15A-M3/9AT application, or SMCJ15A-M3/9AT equivalent, this page delivers verified electrical parameters, thermal derating behavior, polarity marking convention, RoHS/halogen-free compliance status, and AEC-Q101 qualification path - all critical for ESD/surge co-design and long-term supply assurance.
Technical Context
The SMCJ15A-M3/9AT uses a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its breakdown voltage range is 16.7–18.5 V at 1 mA test current, with temperature coefficient of +0.088 %/°C - enabling stable clamping across -55 °C to +150 °C operating junction range.
Mounted on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 6.5 W steady-state power dissipation at TA = 50 °C and exhibits RθJA = 75 °C/W and RθJL = 15 °C/W thermal resistance - confirming suitability for high-reliability PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin below breakdown. |
| VBR min/max | 16.7 V / 18.5 V at IT = 1 mA - Confirmed breakdown threshold window; ensures predictable turn-on under transient stress. |
| VC | 24.4 V at IPPM = 61.5 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity design. |
| IPPM | 61.5 A - Peak surge current supported at rated clamping voltage; validates protection margin for 100 A system-level transients. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ15A-M3/9AT is housed in an SMC (DO-214AB) package with two terminals: cathode marked by a band on the body, and anode unmarked. The device is unidirectional; polarity must be observed during PCB layout to ensure correct clamping direction relative to protected line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection (reverse-biased during normal operation) | Connected to the line requiring protection; clamps to ground when transient exceeds VWM. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current path during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free & RoHS-compliant (M3 suffix) | Meets JEDEC J-STD-020 MSL level 1 and JESD 201 class 2 whisker resistance - suitable for lead-free reflow and high-reliability manufacturing. |
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 4 kV in 2 Ω/12 Ω source impedance configurations. |
| Low clamping ratio (VC/VWM = 1.63) | Minimizes voltage overshoot during clamping - critical for safeguarding 16 V-rated ICs and MOSFETs in 12 V systems. |
| AEC-Q101 qualification path available | Base P/NHM3_X variant supports automotive-grade qualification - allows direct migration to qualified version without layout change. |
| Matte tin-plated leads | Solderable per J-STD-002 and JESD 22-B102 - ensures consistent wetting and joint integrity in high-volume SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied microcontroller power input in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients above 15 V while remaining inert during nominal operation. Use Value: Limits voltage seen by downstream LDO and MCU to ≤24.4 V during 100 A surge events - preventing latch-up and permanent damage. |
Use Scenario: Analog output line (4–20 mA) of pressure sensor in factory automation PLC I/O module subject to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS mounted across signal and return lines to absorb fast-rising transients before they reach op-amp input stage. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <25 V within <1 ns - preserving signal integrity and ADC accuracy. |
| Telecom DC Power Input Protection | Consumer USB Port Surge Suppression |
|
Use Scenario: -48 V DC feed line in telecom base station remote radio unit, vulnerable to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS configured with cathode to -48 V rail and anode to chassis ground to suppress negative-going transients. Use Value: Handles 1500 W surge energy without degradation - maintaining protection performance over >100,000 surge events per MIL-STD-883H Method 3015.8. |
Use Scenario: VBUS line of USB 2.0 host port in smart home hub exposed to user-handling ESD and hot-plug transients. IC Role / Device Role / Timing Role: TVS placed between VBUS and GND to shunt ESD current away from USB controller PHY. Use Value: Achieves <10 nA leakage at 15 V - avoids false disconnect detection while clamping 15 kV air discharge to <30 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A-M3/8A | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs | Reduced surge margin; suited for space-constrained consumer designs with lower threat levels | Select when board area is limited and IEC 61000-4-5 Level 2 (1 kV) compliance suffices. |
| SMCJ15CA-M3/9AT | Bidirectional variant; identical VWM, VBR, VC, and PPPM; no polarity marking | Protects AC-coupled or floating signal lines where bidirectional clamping is required | Choose for differential bus protection (e.g., RS-485) or when signal polarity is undefined. |
Compared with SMAJ15A-M3/8A, the SMCJ15A-M3/9AT provides 275 % higher surge power handling and superior thermal dissipation due to larger SMC package; compared with SMCJ15CA-M3/9AT, it offers optimized unidirectional clamping for DC rails with explicit polarity control - reducing risk of misorientation during assembly.
Availability
SMCJ15A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU power conditioning, industrial sensor interface hardening, and telecom DC input protection requiring stable component supply and halogen-free compliance.
Supply support for SMCJ15A-M3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure resilience and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMCJ15A-M3/9AT at its rated peak pulse current?
The SMCJ15A-M3/9AT has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 61.5 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping performance ensures downstream components see no more than 24.4 V during surge events - making SMCJ15A-M3/9AT suitable for protecting 24 V tolerant interfaces and 16 V logic inputs. This VC is guaranteed across the full operating temperature range.
Is SMCJ15A-M3/9AT RoHS-compliant and halogen-free?
Yes, the "M3" suffix in SMCJ15A-M3/9AT explicitly denotes halogen-free and RoHS-compliant construction per Vishay's material categorization standard. It meets JEDEC J-STD-020 MSL level 1 and passes JESD 201 class 2 whisker testing. The molding compound is UL 94 V-0 rated, and terminals are matte tin plated for lead-free solder compatibility. This makes SMCJ15A-M3/9AT appropriate for environmentally regulated markets including EU automotive and industrial equipment - unlike E3-suffix variants which are RoHS-compliant but not halogen-free.
How does the SMCJ15A-M3/9AT differ from the bidirectional SMCJ15CA-M3/9AT?
The SMCJ15A-M3/9AT is unidirectional with cathode marked by a band, while SMCJ15CA-M3/9AT is bidirectional with no polarity marking and symmetrical clamping in both directions. Both share identical VWM (15 V), VC (24.4 V), and PPPM (1500 W), but only the unidirectional SMCJ15A-M3/9AT supports DC rail protection where polarity is fixed. Using SMCJ15A-M3/9AT on AC or floating lines risks incomplete protection; conversely, SMCJ15CA-M3/9AT adds unnecessary cost and complexity on single-polarity power inputs. The choice depends strictly on signal topology.
What is the thermal resistance and derating behavior of SMCJ15A-M3/9AT?
The SMCJ15A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. Its steady-state power dissipation (PD) drops from 6.5 W at TA = 50 °C to zero at TA = 150 °C, following linear derating per Figure 2 in the datasheet. This behavior confirms suitability for convection-cooled industrial PCBs without heatsinks - provided minimum pad area and airflow meet Vishay's layout guidelines.
Can SMCJ15A-M3/9AT be used in automotive applications requiring AEC-Q101 qualification?
The base SMCJ15A-M3/9AT is commercial-grade, but Vishay offers the HM3-suffix variant (e.g., SMCJ15A-HM3_X) that is fully AEC-Q101 qualified. The "_X" denotes revision code (e.g., A, B), and HM3 parts retain identical electrical specs, SMC package, and halogen-free/RoHS compliance. For automotive production, engineers should specify SMCJ15A-HM3_A/9AT or later - not SMCJ15A-M3/9AT - to meet qualification requirements. No PCB layout change is needed between M3 and HM3 versions, enabling seamless qualification upgrade.
SMCJ15A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ15A-M3/9AT FAQ
1.How can I place an order for SMCJ15A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ15A-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCJ15A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ15A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ15A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ15A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ15A-M3/9AT?
SMCJ15A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ15A-M3/9AT 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-M3/9AT?
For technical support, including SMCJ15A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ15A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ15A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ15A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ15A-M3/9AT?
All SMCJ15A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ15A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ15A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ15A-M3/9AT Tags
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