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Taiwan Semiconductor Corporation SMCJ78CH
- Part No.:
- SMCJ78CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CH.pdf
- Description:
- 1500W, 96.4V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,510
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Product details
Overview
SMCJ78CH from Taiwan Semiconductor is a bidirectional 1500W surface-mount 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-grade ESD and surge protection in power supply rails and data lines.
For engineers reviewing the SMCJ78CH datasheet, SMCJ78CH pinout, SMCJ78CH application, or SMCJ78CH equivalent, key selection criteria include AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and bidirectional clamping symmetry for ungrounded signal paths.
Technical Context
The SMCJ78CH implements a glass-passivated silicon junction optimized for fast transient suppression in harsh environments. Its bidirectional configuration enables symmetrical clamping in both polarities without external polarity management, and it meets automotive-level surge immunity per ISO 7637-2 across all defined test pulses (1, 2a, 2b, 3a, 3b).
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, supporting sustained operation up to TJ = +150°C. The device sustains 200A non-repetitive forward surge (IFSM) and maintains <1µA IR at VWM, ensuring minimal standby power loss in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 86.7 V / 106 V @ IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM |
| VC @ IPPM | 139 V @ 11.3 A - Clamping voltage during 10/1000 µs surge defines worst-case overvoltage seen by protected circuit |
| PPK | 1500 W - Peak pulse power rating determines survivability under standardized lightning/surge transients |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensing nodes |
| TJ max | +150 °C - Junction temperature limit supports under-hood automotive deployment without derating |
| Response time | <1.0 ps - Sub-picosecond junction response enables protection of high-speed interfaces against ESD events |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional, cathode band omitted (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient conduction path | Both terminals function identically - no polarity sensitivity; connects across protected line and ground or between differential lines |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides low-inductance path and aids heat dissipation into PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD-HBM/MM |
| ISO 7637-2 compliant | Guaranteed immunity to all five standardized vehicle electrical transient pulses (Pulse 1, 2a, 2b, 3a, 3b) |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow - compatible with standard SMT assembly without dry-pack handling |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive - suitable for green manufacturing and export compliance |
Applications
| Automotive Power Rail Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 78V. Use Value: Withstands 1500W peak pulses and clamps to ≤139V, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Shielding CAN_H/CAN_L differential pair from ESD and coupled transients in factory automation networks. IC Role / Device Role / Timing Role: Bidirectional TVS connected across CAN bus lines to suppress common-mode surges while preserving signal integrity. Use Value: Sub-1ps response ensures clamping occurs before CAN transceiver input stages are stressed; low capacitance avoids signal distortion. |
| Telecom AC/DC Adapter Input | Smart Meter Power Supply Stage |
Use Scenario: Safeguarding primary-side rectifier and controller ICs in wall adapters subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on secondary-side DC output to absorb residual transients passing through isolation barrier. Use Value: 139V clamping limits overvoltage to safe levels for 24V-rated regulators and optocouplers; UL 94V-0 molding compound enhances fire safety. | Use Scenario: Securing meter's auxiliary power supply against grid switching transients and induced surges on utility-connected inputs. IC Role / Device Role / Timing Role: Bidirectional TVS across input capacitor terminals to protect buck converter IC and measurement front-end. Use Value: AEC-Q101 qualification ensures robustness in field-deployed meters; 1µA leakage prevents battery drain in backup circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA | 600W rating, SMB package (smaller footprint), higher VC = 129V @ 9.2A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or 2b | Select only if system-level surge energy is confirmed ≤600W and space constraints prohibit SMC package |
| 1.5KE78CA | Through-hole TO-218 package, same 1500W rating, VC = 129V @ 11.6A | Not AEC-Q101 qualified; lacks ISO 7637-2 validation; incompatible with automated SMT lines | Use only in legacy through-hole designs where rework to SMT is impractical |
Compared with SMBJ78CA and 1.5KE78CA, the SMCJ78CH delivers higher surge robustness in a qualified automotive SMT package, enabling direct integration into modern ECU and telematics modules without layout or qualification compromise.
Availability
SMCJ78CH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN networks, and smart metering platforms requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ78CH 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 automotive-qualified components.
The SMCJ series was developed specifically for AEC-Q101-compliant transient suppression in automotive power distribution and communication subsystems, emphasizing robustness, consistency, and SMT manufacturability.
FAQ
What does the "CH" suffix indicate in SMCJ78CH?
The "CH" suffix in SMCJ78CH denotes a bidirectional configuration with glass passivation and AEC-Q101 qualification. Unlike unidirectional "H" variants, the "CH" version provides symmetrical clamping in both polarities - essential for protecting floating or differential signal lines such as CAN, LIN, or RS-485 without polarity concerns. This is confirmed in the datasheet's "Devices for bipolar applications" section.
Is SMCJ78CH compliant with ISO 7637-2, and which pulses does it cover?
Yes, SMCJ78CH is explicitly validated to meet ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b. This is stated in the FEATURES section of the datasheet and verified via standardized test waveforms. The 1500W rating and low clamping voltage (139V) ensure margin against the most severe automotive transients, including load dump (Pulse 5 not covered - requires separate solution).
What is the maximum clamping voltage of SMCJ78CH, and at what current is it specified?
The maximum clamping voltage (VC) of SMCJ78CH is 139 V, measured at a peak pulse current (IPPM) of 11.3 A under the standard 10/1000 µs waveform (per Fig.5). This value is listed in the Electrical Specifications table for SMCJ78CH and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMCJ78CH require special handling for moisture sensitivity?
No - SMCJ78CH has a J-STD-020 moisture sensitivity level (MSL) of 1, meaning it can be stored indefinitely at ambient conditions and placed directly into reflow without baking or dry-pack requirements. This simplifies SMT line integration and eliminates yield loss from moisture-related popcorning during soldering.
How does SMCJ78CH differ from SMCJ78AH in performance?
SMCJ78CH and SMCJ78AH share identical VWM (78 V), VBR (86.7–106 V), and VC (139 V), but SMCJ78CH is bidirectional while SMCJ78AH is unidirectional. The "CH" variant clamps symmetrically in both directions; the "AH" variant requires correct polarity orientation and exhibits forward conduction below ~3.5 V. This makes SMCJ78CH preferable for differential or AC-coupled lines.
SMCJ78CH 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ78CH FAQ
1.How can I place an order for SMCJ78CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CH 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 SMCJ78CH reliable?
The price and inventory of SMCJ78CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CH is usually 5 days.
3.What payment methods are accepted for SMCJ78CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CH?
SMCJ78CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CH 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 SMCJ78CH?
For technical support, including SMCJ78CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CH requirements.
6.How does Aetrix verify that SMCJ78CH is sourced from the original manufacturer or authorized distributors?
All SMCJ78CH 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 SMCJ78CH meets industry standards.
7.What is the process for return or replacement of SMCJ78CH?
All SMCJ78CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CH, 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 SMCJ78CH part is unused and in its original packaging.
Return procedure for SMCJ78CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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