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Taiwan Semiconductor Corporation SMCJ78C
- Part No.:
- SMCJ78C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78C.pdf
- Description:
- 1500W, 96.4V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,366
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Product details
Overview
SMCJ78C from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 78V working stand-off voltage (VWM), 86.7–106V breakdown voltage (VBR), and 139V maximum clamping voltage (VC) at 11.3A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ78C datasheet, SMCJ78C pinout, SMCJ78C application, or SMCJ78C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and unidirectional polarity marking per cathode band.
Technical Context
The SMCJ78C employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 µA at 78 V). Its thermal design supports 150°C max junction temperature with RθJA = 55°C/W and RθJC = 10°C/W, enabling robust operation in high-ambient industrial environments.
It is rated for non-repetitive 1500W peak pulse power (tp = 1 ms), 200A peak forward surge current (8.3 ms half-sine), and meets IEC 61249-2-21 halogen-free and RoHS compliance requirements - all verified per JESD 201 Class 2 whisker testing and UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 86.7 V / 106 V @ IT = 1 mA - ensures reliable turn-on margin above VWM under production tolerance |
| VC @ IPPM | 139 V @ 11.3 A - limits downstream voltage stress during ISO 7637-2 Pulse 5a (load dump) |
| PPK | 1500 W - peak pulse power handling capability for 1 ms transient events |
| IR @ VWM | <1 µA - negligible leakage current preserves system standby power integrity |
| TJ max | +150 °C - enables deployment in under-hood automotive or high-temp industrial enclosures |
| Package | DO-214AB (SMC) - surface-mount footprint compatible with automated placement and IPC-7351B land pattern |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode indicated by band on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines clamping reference point |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail); marked by band; conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) immunity testing |
| Fast response time | <1.0 ps from 0 V to VBR min - prevents sub-nanosecond ESD/EFT transients from reaching sensitive ICs |
| Moisture sensitivity | MSL 1 (unlimited floor life) - eliminates bake requirements prior to reflow soldering |
| Halogen-free construction | Complies with IEC 61249-2-21 - supports green manufacturing and end-of-life recycling mandates |
| Glass passivation | Stable junction characteristics over temperature and lifetime - reduces parameter drift vs. epoxy-passivated alternatives |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12 V battery-fed control module exposed to ISO 7637-2 Pulse 5a (load dump up to 60 V over 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤139 V, preventing damage to 40 V-rated input MOSFETs and maintaining system uptime. | Use Scenario: 24 V digital input channel subjected to inductive kickback from solenoid de-energization. IC Role / Device Role / Timing Role: Primary overvoltage suppression device across field-side input terminals. Use Value: Absorbs 1500 W peak energy within 1 ms, eliminating need for additional RC snubbers or relay contact protection. |
| LED Driver Surge Suppression | Telecom Power Interface Protection |
Use Scenario: Constant-current LED driver board powered from unregulated 48 V telecom supply experiencing lightning-induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on main DC input before buck controller. Use Value: Clamps 10/1000 µs surge to 139 V, protecting 65 V-rated gate drivers and ensuring >100,000 surge cycles MTBF. | Use Scenario: Central office power feed interface exposed to EFT bursts per IEC 61000-4-4 (4 kV, 5 kHz). IC Role / Device Role / Timing Role: First-line defense on -48 V DC input bus before DC-DC isolation stage. Use Value: Sub-1 µA leakage at 78 V preserves low-power monitoring circuit accuracy during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A | 600 W PPK rating, SMB package (smaller footprint), same VWM/VBR/VC specs | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select SMCJ78C when 1500 W surge capacity and DO-214AB thermal mass are required |
| 1.5KE78CA | Bidirectional configuration (CA suffix), axial leaded DO-201 package, 1500 W rating | Requires PCB layout change; lacks MSL 1 rating and automated placement compatibility | Choose SMCJ78C for surface-mount volume production and unidirectional rail protection |
Compared with SMBJ78A and 1.5KE78CA, the SMCJ78C delivers higher thermal mass for repeated surge events, native SMT manufacturability, and guaranteed MSL 1 handling - making it optimal for automotive and industrial control modules requiring long-term reliability under harsh electrical environments.
Availability
SMCJ78C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, LED driver surge suppression, and telecom power interface protection requiring stable component supply and full traceability.
Supply support for SMCJ78C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and bipolar transistors.
The SMCJ series is part of TSC's high-power transient suppression product line, engineered specifically for automotive, industrial, and telecom applications demanding ISO 7637-2 compliance, high surge robustness, and automated assembly readiness.
FAQ
What is the clamping voltage of the SMCJ78C under standard test conditions?
The SMCJ78C has a maximum clamping voltage (VC) of 139 V at 11.3 A peak pulse current (IPPM), measured using the 10/1000 µs waveform per IEC 61000-4-5. This value is confirmed in the Electrical Specifications table on page 3 of the official Taiwan Semiconductor datasheet revision S2104. The SMCJ78C maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is the SMCJ78C unidirectional or bidirectional, and how is polarity identified?
The SMCJ78C is a unidirectional TVS diode, indicated by the absence of "CA" suffix (which denotes bidirectional variants like SMCJ78CA). Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end connects to the protected line, while the anode connects to ground. This configuration ensures conduction only during positive transients on the cathode side.
Does the SMCJ78C meet automotive-grade reliability standards such as AEC-Q200?
The SMCJ78C is not explicitly qualified to AEC-Q200 in the published documentation. However, it meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transient immunity and is rated for 150°C junction temperature - common requirements in under-hood applications. For AEC-Q200-compliant designs, engineers should verify qualification status directly with Taiwan Semiconductor or select the AEC-Q200-certified SMCJ78C-AQ variant if available.
What is the moisture sensitivity level (MSL) and reflow profile compatibility for the SMCJ78C?
The SMCJ78C has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it has unlimited floor life and requires no baking prior to reflow soldering. It is compatible with standard lead-free reflow profiles (peak temperature ≤260°C), and its matte tin-plated leads comply with J-STD-002 for solderability. The DO-214AB package also passes JESD 201 Class 2 whisker testing.
How does the SMCJ78C compare to the SMCJ78A in terms of electrical performance?
The SMCJ78C and SMCJ78A differ in breakdown voltage tolerance: SMCJ78C has VBR = 86.7–106 V, while SMCJ78A has tighter VBR = 86.7–95.8 V. Both share identical VWM (78 V), VC (139 V / 126 V respectively), and PPK (1500 W). The SMCJ78C offers wider VBR spread for cost-sensitive applications where clamping consistency is less critical than absolute surge capacity.
SMCJ78C 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):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 139V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMCJ78C FAQ
1.How can I place an order for SMCJ78C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78C 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 SMCJ78C reliable?
The price and inventory of SMCJ78C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78C is usually 5 days.
3.What payment methods are accepted for SMCJ78C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78C?
SMCJ78C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78C 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 SMCJ78C?
For technical support, including SMCJ78C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78C requirements.
6.How does Aetrix verify that SMCJ78C is sourced from the original manufacturer or authorized distributors?
All SMCJ78C 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 SMCJ78C meets industry standards.
7.What is the process for return or replacement of SMCJ78C?
All SMCJ78C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78C, 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 SMCJ78C part is unused and in its original packaging.
Return procedure for SMCJ78C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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