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Vishay General Semiconductor - Diodes Division SMCJ15A/7T
- Part No.:
- SMCJ15A/7T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ15A/7T.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,239
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Product details
Overview
SMCJ15A/7T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 15 V stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V clamping voltage (VC) at 61.5 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ15A/7T datasheet, SMCJ15A/7T pinout, SMCJ15A/7T application, or SMCJ15A/7T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ15A/7T operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its VBR threshold, diverting transient energy to ground while clamping the protected line to ≤24.4 V. Its glass-passivated junction ensures stable leakage (<1.0 µA at 15 V) and repeatable breakdown behavior across temperature.
Designed for single-polarity DC protection, it supports surge immunity per IEC 61000-4-5 (10/1000 µs) and meets MSL Level 1 reflow requirements (260 °C peak). Thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature without heatsinking under defined PCB layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail voltage margin |
| VBR min/max | 16.7 V / 18.5 V at 1 mA - guaranteed breakdown range ensuring consistent turn-on across production lots |
| VC @ IPPM | 24.4 V at 61.5 A - clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs |
| PPPM | 1500 W - peak transient power handling capacity; enables protection against high-energy lightning-induced surges |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; preserves battery life and signal integrity in low-power systems |
| TJ max | +150 °C - extended thermal rating supporting under-hood automotive and industrial environments |
| Package | DO-214AB (SMCJ) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm pad footprint for optimal thermal dissipation |
Pinout & Package
DO-214AB (SMCJ) package: molded plastic case with J-bend leads, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102, polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; completes conduction path during transient clamp |
| Cathode | Protected line input | Connected to line being protected (e.g., 12 V supply rail); reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| MSL Level 1 rating | Enables single-reflow assembly without moisture sensitivity concerns (peak 260 °C) |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for sensitive 3.3 V/5 V logic |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and telecom equipment |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VCC and GND, clamping transients above 18.5 V while maintaining <1 µA leakage at 15 V. Use Value: Enables compliance with ISO 7637-2 Pulse 5a (load dump) and extends MCU lifetime by limiting voltage stress to ≤24.4 V during 1500 W surges. | Use Scenario: Safeguarding analog outputs of industrial temperature sensors connected to 24 V loop-powered transmitters. IC Role / Device Role / Timing Role: Standoff protection device on 24 V supply line, absorbing inductive kickback from solenoid drivers sharing the same rail. Use Value: Prevents sensor output corruption and ADC saturation by clamping spikes to 24.4 V with sub-100 ns response time and no degradation after repeated 61.5 A pulses. |
| Telecom DC Power Input Protection | Consumer Device USB Port ESD Suppression |
Use Scenario: Securing primary 48 V DC input of PoE-powered network switches against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage overvoltage protector upstream of DC/DC converters, rated for 1500 W 10/1000 µs waveforms. Use Value: Provides coordinated protection with downstream MOVs and polymer PTCs, reducing failure rate in field-deployed infrastructure by limiting let-through energy to <10 mJ. | Use Scenario: Adding secondary-level surge protection on 5 V USB VBUS lines in smart home hubs exposed to accidental AC mains contact. IC Role / Device Role / Timing Role: High-power TVS placed between USB connector and USB controller's VBUS pin, complementing integrated ESD diodes. Use Value: Survives multiple 1500 W surges without parametric shift, preserving USB enumeration reliability and eliminating field returns due to port damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC15A-E3/57T | Same DO-214AB package, identical VWM (15 V) and PPPM (1500 W), but lower VC = 23.2 V at 64.7 A; slightly tighter VBR tolerance (16.7–17.9 V) | Better clamping performance for 3.3 V logic interfaces; optimized for space-constrained consumer designs | Select SAC15A-E3/57T when lower clamping voltage is critical and AEC-Q101 qualification is not required |
| 1.5SMC15A | Same electrical specs and DO-214AB package, but manufactured by Littelfuse; RoHS-compliant, non-AEC-Q101 qualified; VF = 3.5 V at 100 A (uni-directional only) | Preferred for commercial/industrial applications where automotive qualification is unnecessary and dual-source procurement is desired | Choose 1.5SMC15A for cost-sensitive BOMs requiring second-source availability without AEC-Q101 validation |
Compared with SAC15A-E3/57T and 1.5SMC15A, the SMCJ15A/7T uniquely combines AEC-Q101 qualification, MSL Level 1 reflow compatibility, and Vishay's glass-passivated junction for enhanced long-term reliability in harsh environments - making it the preferred choice for automotive and mission-critical industrial deployments.
Availability
SMCJ15A/7T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, and telecom power supplies requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCJ15A/7T 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® transient voltage suppressor family, engineered specifically for high-energy surge protection in automotive, industrial, and telecom infrastructure where robustness, consistency, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMCJ15A/7T and how does it protect downstream components?
The SMCJ15A/7T has a maximum clamping voltage (VC) of 24.4 V at 61.5 A peak pulse current (10/1000 µs waveform). This means that during a transient event, the device limits the voltage seen by downstream components - such as MCUs or interface ICs - to no more than 24.4 V. Since its stand-off voltage is 15 V and breakdown begins at 16.7 V, the SMCJ15A/7T provides a clear margin between normal operation and protective conduction, preventing overvoltage damage while maintaining low leakage (<1.0 µA) during steady-state conditions.
Is the SMCJ15A/7T suitable for automotive applications?
Yes, the SMCJ15A/7T is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes a glass-passivated junction, MSL Level 1 reflow compatibility (260 °C peak), and operation over –55 °C to +150 °C junction temperature. These attributes make the SMCJ15A/7T appropriate for under-hood engine control units, body control modules, and ADAS sensor power rails where reliability under thermal cycling and high-energy transients is essential.
What does the "/7T" suffix indicate in SMCJ15A/7T?
The "/7T" suffix in SMCJ15A/7T denotes the packaging configuration: 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel. This format is optimized for high-volume automated SMT placement. The "E3" marking (implied in Vishay's ordering nomenclature) confirms RoHS compliance and commercial-grade qualification; for AEC-Q101 versions, the "HE3" suffix would be used instead.
How does the SMCJ15A/7T differ from bi-directional variants like SMCJ15CA?
The SMCJ15A/7T is unidirectional, meaning it conducts only in reverse bias (cathode-to-anode) and blocks forward current - ideal for DC power rail protection. In contrast, SMCJ15CA is bi-directional, functioning identically in both polarities and suited for AC lines or data bus protection. The SMCJ15A/7T has a cathode band marking, while SMCJ15CA has no polarity marking. Their VWM (15 V), VBR (16.7–18.5 V), and VC (24.4 V) are identical, but the SMCJ15A/7T supports higher IFSM (200 A) due to its unidirectional architecture.
What PCB layout considerations are required for optimal thermal performance of the SMCJ15A/7T?
For optimal thermal performance, the SMCJ15A/7T must be mounted on minimum recommended copper pads: 0.31" × 0.31" (8.0 mm × 8.0 mm) per terminal, as specified in the Vishay datasheet. This layout achieves the stated thermal resistance of 75 °C/W (junction-to-ambient). Reducing pad size increases junction temperature rise during surge events, potentially degrading clamping consistency and long-term reliability. Use of internal copper planes or thermal vias is recommended for sustained power dissipation scenarios exceeding 6.5 W.
SMCJ15A/7T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 (SMCJ)
SMCJ15A/7T FAQ
1.How can I place an order for SMCJ15A/7T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ15A/7T 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/7T reliable?
The price and inventory of SMCJ15A/7T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ15A/7T is usually 5 days.
3.What payment methods are accepted for SMCJ15A/7T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ15A/7T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ15A/7T?
SMCJ15A/7T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ15A/7T 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/7T?
For technical support, including SMCJ15A/7T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ15A/7T requirements.
6.How does Aetrix verify that SMCJ15A/7T is sourced from the original manufacturer or authorized distributors?
All SMCJ15A/7T 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/7T meets industry standards.
7.What is the process for return or replacement of SMCJ15A/7T?
All SMCJ15A/7T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ15A/7T, 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/7T part is unused and in its original packaging.
Return procedure for SMCJ15A/7T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ15A/7T Tags
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