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Taiwan Semiconductor Corporation SMCJ14
- Part No.:
- SMCJ14
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ14.pdf
- Description:
- 1500W, 17.4V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ14 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 14V working stand-off voltage (VWM), 15.6–19.1V breakdown voltage (VBR), and 25.8V maximum clamping voltage (VC) at 61A peak pulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.
For engineers reviewing the SMCJ14 datasheet, SMCJ14 pinout, SMCJ14 application, or SMCJ14 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD rating, peak pulse current capability under ISO 7637-2 Pulse 5a, thermal derating above 25°C ambient, and unidirectional polarity marking alignment with system ground-referenced transients.
Technical Context
The SMCJ14 operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its VBR range (15.6–19.1V at 1mA test current), limiting transient energy by shunting surge current to ground while maintaining VC ≤ 25.8V at IPPM = 61A per 10/1000μs waveform. Its glass-passivated junction ensures stable leakage (<1μA at 14V) and fast response (<1.0ps).
Designed for unidirectional operation only, the device features a cathode band marking, complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements, and supports steady-state power dissipation of 5W at 25°C with junction temperature rated from –55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for normal circuit operation without leakage-induced stress. |
| VBR min/max | 15.6 / 19.1 V @ 1 mA - Confirmed breakdown threshold range; defines minimum overvoltage level at which clamping initiates reliably. |
| VC @ IPPM | 25.8 V @ 61 A - Clamped voltage during 10/1000μs surge; determines maximum stress imposed on downstream ICs during worst-case transients. |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive event; enables robust protection against automotive load-dump pulses. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; ensures negligible standby current drain in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments with proper PCB copper area. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end; weight ≈ 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground-reference terminal | Connected to system ground or low-side return path; completes conduction loop during reverse-biased transient events. |
| Cathode | Protected-line terminal | Connected to the line being protected (e.g., 12V rail); reverse voltage applied between cathode and anode triggers clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and IR across temperature and humidity, critical for automotive field reliability. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling), meeting OEM ECU requirements. |
| Fast response time <1.0 ps | Enables clamping before transient energy couples into sensitive analog or digital circuitry, preserving signal integrity. |
| Moisture sensitivity level 1 | Per J-STD-020 - allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing flow. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery-fed ECU power input subjected to load-dump transients up to 35V for 400ms per ISO 7637-2 Pulse 5a. IC Role / Device Role: Primary clamping element placed between fused 12V rail and DC-DC converter input. Use Value: Limits voltage seen by downstream regulator to ≤25.8V, preventing overvoltage shutdown or latch-up during engine cranking or alternator regulation failure. | Use Scenario: Digital output channel driving 24V solenoid loads in factory automation controllers, subject to inductive kickback. IC Role / Device Role: Snubber-level TVS placed across relay coil terminals and driver FET drain-source. Use Value: Absorbs 1500W peak energy from coil de-energization, protecting gate drivers and isolators from >100V spikes without requiring active snubbing circuits. |
| LED Driver Surge Suppression | ESD-Prone Sensor Interface Protection |
Use Scenario: Constant-current LED driver board powered from 24V industrial bus, exposed to cable discharge events and lightning-induced surges. IC Role / Device Role: Input-stage TVS on main power entry, upstream of bulk capacitor and controller IC. Use Value: Clamps 61A surge current while holding input voltage ≤25.8V, avoiding overvoltage damage to buck controller and current-sense amplifier. | Use Scenario: Automotive cabin temperature sensor connected via 2m harness to MCU, vulnerable to ESD contact discharge per ISO 10605 (15kV air, 8kV contact). IC Role / Device Role: Secondary protection device placed after series ferrite bead, directly at sensor IC power pins. Use Value: Provides sub-1ns response to ESD events, limiting transient voltage to 25.8V before it reaches the sensor's 3.3V LDO and ADC front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A | Lower PPK (600W), smaller SMB package (DO-214AA), tighter VBR tolerance (15.6–17.2V), same VWM and VC. | Suitable for lower-energy transients (e.g., IEC 61000-4-5 Level 3) but insufficient for full ISO 7637-2 Pulse 5a load-dump. | Select SMCJ14 when 1500W surge capacity and DO-214AB thermal mass are required for high-power automotive or industrial use. |
| 1.5KE14A | Through-hole TO-204AA (DO-41) package, same 14V VWM and 25.8V VC, but higher IR (5μA) and slower response (>1ps). | Requires manual insertion or wave soldering; less suitable for automated SMT lines and space-constrained PCBs. | Choose SMCJ14 for surface-mount compatibility, automated assembly, and superior moisture resistance (MSL 1 vs. MSL not specified). |
Compared with SMBJ14A and 1.5KE14A, the SMCJ14 delivers higher surge power handling in a moisture-insensitive SMT package with verified ISO 7637-2 compliance - making it the preferred choice for automotive-grade 12V rail protection where layout density and production scalability matter.
Availability
SMCJ14 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, LED driver power inputs, and ESD-prone sensor interfaces requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMCJ14 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series belongs to TSC's high-power transient suppression product line, engineered specifically for ISO 7637-2-compliant protection of 12V/24V vehicle electrical systems and ruggedized industrial control equipment.
FAQ
What is the clamping voltage of the SMCJ14 under standard 10/1000μs surge conditions?
The SMCJ14 has a maximum clamping voltage (VC) of 25.8 V when subjected to its rated peak pulse current (IPPM) of 61 A 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 transient events. The SMCJ14 maintains this clamping performance consistently due to its glass-passivated silicon junction and DO-214AB thermal design.
Is the SMCJ14 suitable for bidirectional transient protection?
No, the SMCJ14 is a unidirectional TVS diode intended only for reverse-biased surge suppression relative to ground. It features a cathode band marking and is not rated for symmetrical bipolar operation. For bidirectional applications, the SMCJ14A variant or dedicated CA-suffix parts (e.g., SMCJ14CA) must be used. Using the SMCJ14 in bidirectional configurations may result in forward conduction failure or inadequate clamping in one polarity.
What is the maximum steady-state power dissipation rating for the SMCJ14?
The SMCJ14 has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, as specified in its Absolute Maximum Ratings table. This value decreases linearly with rising ambient temperature per the derating curve in Figure 2 of the datasheet. At 100°C ambient, PD drops to approximately 2.75 W. Proper PCB copper area and thermal vias are essential to maintain safe junction temperatures within the –55°C to +150°C operating range.
Does the SMCJ14 meet automotive industry surge immunity standards?
Yes, the SMCJ14 meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling), as explicitly stated in its Features section. While it is not rated for Pulse 5a (load dump) alone due to energy magnitude, its 1500W peak power rating and 25.8V clamping enable effective implementation in conjunction with upstream impedance (e.g., fuse + wire resistance) to satisfy full ISO 7637-2 compliance in automotive power rail designs.
What is the moisture sensitivity level (MSL) of the SMCJ14 and how does it affect manufacturing?
The SMCJ14 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be processed through standard reflow soldering profiles without pre-baking. This eliminates moisture-related popcorning risk and simplifies SMT line integration - especially valuable for high-volume automotive and industrial production where process robustness and yield consistency are critical. The DO-214AB molding compound also meets UL 94V-0 flammability requirements.
SMCJ14 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 61A
- 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)
SMCJ14 FAQ
1.How can I place an order for SMCJ14 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ14 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 SMCJ14 reliable?
The price and inventory of SMCJ14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ14 is usually 5 days.
3.What payment methods are accepted for SMCJ14?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ14 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ14?
SMCJ14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ14 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 SMCJ14?
For technical support, including SMCJ14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ14 requirements.
6.How does Aetrix verify that SMCJ14 is sourced from the original manufacturer or authorized distributors?
All SMCJ14 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 SMCJ14 meets industry standards.
7.What is the process for return or replacement of SMCJ14?
All SMCJ14 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ14, 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 SMCJ14 part is unused and in its original packaging.
Return procedure for SMCJ14:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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