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Taiwan Semiconductor Corporation SMCJ51C
- Part No.:
- SMCJ51C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51C.pdf
- Description:
- 1500W, 63V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,605
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Product details
Overview
SMCJ51C from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 51V working stand-off voltage (VWM), 56.7–69.3V breakdown voltage (VBR), and 91.1V maximum clamping voltage (VC) at 17A peak impulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.
For engineers reviewing the SMCJ51C datasheet, SMCJ51C pinout, SMCJ51C application, or SMCJ51C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, unidirectional polarity marking, and compatibility with automated SMT placement on high-reliability industrial PCBs.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped crowbar device during transients, leveraging a glass-passivated silicon junction to achieve sub-1ps response time and <1μA reverse leakage above 10V. Its single-die DO-214AB construction supports 1500W peak pulse power (tp = 1ms) and 5W steady-state dissipation at 25°C ambient.
Thermal design relies on RθJA = 55°C/W and RθJC = 10°C/W, enabling operation from –55°C to +150°C junction temperature. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for molded compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 56.7 V / 69.3 V @ IT = 1 mA - verified breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 91.1 V @ 17 A - clamping voltage limiting downstream circuit stress during 10/1000μs surge |
| PPK | 1500 W - peak pulse power handling per single 1ms transient per Fig.5 waveform |
| IR @ VWM | ≤1 μA - negligible standby leakage ensuring minimal power loss in always-on systems |
| TJ max | +150 °C - maximum junction temperature supporting under-hood automotive deployment |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with cathode band polarity marking |
Pinout & Package
DO-214AB (SMC) package: surface-mount, dual-leaded, rectangular body with molded epoxy case and visible cathode band indicating terminal polarity. Matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; forms clamping loop with cathode |
| Cathode | High-side transient sink | Connected to protected line (e.g., 12V rail); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and humidity exposure, critical for automotive under-hood reliability |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | Typically <1.0 ps from 0 V to VBR min - enables protection of fast-edge logic and analog interfaces |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement before reflow - simplifies SMT manufacturing flow |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance for global OEMs |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 120V, 400ms) on 12V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges before LDOs or controllers. Use Value: Limits voltage to ≤91.1V during 17A surge, preventing damage to 36V-rated input stages and meeting OEM LV-124 requirements. | Use Scenario: Protecting 24V digital input modules in factory automation cabinets from relay-contact bounce and solenoid flyback. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated optocoupler inputs, shunting energy before signal conditioning circuitry. Use Value: Withstands repetitive 10/1000μs pulses up to 1500W without degradation, extending module MTBF beyond 10 years. |
| LED Driver Overvoltage Clamp | Telecom DC Feeder Protection |
Use Scenario: Safeguarding constant-current LED drivers in streetlight systems exposed to lightning-induced surges on AC mains-derived 48V DC bus. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp overvoltage events exceeding 51V nominal bus. Use Value: Clamps within 1ps to 91.1V, preserving LED string integrity and avoiding false shutdowns triggered by slower MOV-based solutions. | Use Scenario: Protecting PoE-powered network switches connected to outdoor copper lines subject to induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS on 48V DC feeder lines after primary gas discharge tube (GDT) stage. Use Value: Provides low-clamping secondary protection with <1μA leakage, minimizing standby power loss in always-on telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | 600W rating, SMB package (smaller footprint), higher VC = 87.1V @ 12.5A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 due to lower PPK | Select when board space is constrained and surge energy does not exceed 600W |
| 1.5KE51A | Through-hole DO-201 package, same 1500W rating, VC = 84.5V @ 17.7A | Not compatible with automated SMT; requires wave solder or hand assembly | Select only for legacy through-hole designs or prototyping where reflow is unavailable |
Compared with SMBJ51A and 1.5KE51A, the SMCJ51C delivers identical 1500W surge capability in an SMT-optimized DO-214AB package with tighter VBR tolerance and lower thermal resistance than through-hole alternatives - making it optimal for high-volume automotive and industrial PCBs requiring both robustness and manufacturability.
Availability
SMCJ51C is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SMCJ51C 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification for automotive-grade products.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments - targeting ISO 7637-2 compliance, extended temperature operation, and zero-defect SMT reliability in automotive and industrial power systems.
FAQ
What is the polarity configuration of the SMCJ51C?
The SMCJ51C is a unidirectional TVS diode with clearly marked cathode band on the DO-214AB package. It conducts only when the cathode is at higher potential than the anode - making it suitable for DC rail protection where polarity is fixed, unlike bidirectional variants (e.g., SMCJ51CA) used in AC or floating applications. This polarity must be observed during PCB layout to ensure proper clamping function.
Does the SMCJ51C meet automotive transient immunity standards?
Yes, the SMCJ51C meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) requirements. Its 1500W peak power rating, 91.1V clamping voltage at 17A, and sub-1ps response time are validated per the standard's test waveforms - confirming suitability for 12V automotive subsystems including body control modules and infotainment power supplies.
What is the maximum junction temperature and how does it affect layout?
The SMCJ51C has a maximum junction temperature (TJ) of +150°C and thermal resistance RθJA = 55°C/W. To maintain safe operation at full 1500W surge, PCB copper area and via count must be optimized - typical layouts use ≥25 mm² of 2-oz copper per pad with ≥4 thermal vias to internal ground planes. Derating curves in Figure 2 show power reduction above 25°C ambient, requiring thermal modeling for under-hood deployments.
How does the SMCJ51C differ from the SMCJ51A variant?
The SMCJ51C has a VBR range of 56.7–69.3V and clamps at 91.1V (VC) with 17A (IPPM), while the SMCJ51A specifies a tighter VBR range of 56.7–62.7V and clamps at 82.4V (VC) with 19A (IPPM). The 'A' suffix denotes enhanced VBR uniformity and lower clamping voltage - making SMCJ51A preferable where tighter voltage control and lower let-through stress are critical, though both share identical package, power rating, and application scope.
Is the SMCJ51C halogen-free and RoHS compliant?
Yes, the SMCJ51C is halogen-free per IEC 61249-2-21 and RoHS compliant per EU Directive 2011/65/EU. The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. These certifications are confirmed in TSC's material declarations and apply to all production lots shipped after Version S2104 release.
SMCJ51C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 17A
- 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)
SMCJ51C FAQ
1.How can I place an order for SMCJ51C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51C 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 SMCJ51C reliable?
The price and inventory of SMCJ51C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51C is usually 5 days.
3.What payment methods are accepted for SMCJ51C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51C?
SMCJ51C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51C 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 SMCJ51C?
For technical support, including SMCJ51C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51C requirements.
6.How does Aetrix verify that SMCJ51C is sourced from the original manufacturer or authorized distributors?
All SMCJ51C 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 SMCJ51C meets industry standards.
7.What is the process for return or replacement of SMCJ51C?
All SMCJ51C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51C, 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 SMCJ51C part is unused and in its original packaging.
Return procedure for SMCJ51C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51C Tags
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