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Taiwan Semiconductor Corporation SMCJ8.5CH
- Part No.:
- SMCJ8.5CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CH.pdf
- Description:
- 1500W, 10.5V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,768
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Product details
Overview
SMCJ8.5CH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 8.5V working stand-off voltage, 9.44–11.5V breakdown voltage at 1mA test current, and 15.9V maximum clamping voltage at 20A peak pulse current. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.
For engineers reviewing the SMCJ8.5CH datasheet, SMCJ8.5CH pinout, SMCJ8.5CH application, or SMCJ8.5CH equivalent, this device is selected for robust overvoltage immunity in automotive power-line interfaces, industrial I/O ports, and telecom DC supply rails where fast response (<1.0ps), low leakage (<1μA above 10V), and high surge capability are required.
Technical Context
The SMCJ8.5CH uses a glass-passivated silicon junction to achieve stable breakdown behavior and low capacitance, enabling effective suppression of fast transients such as ESD and load-switching spikes. Its unidirectional configuration provides forward conduction path while clamping reverse surges, with VF = 3.5V at 100A per specification.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting operation up to TJ = +150°C. It complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, ensuring reliability in automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 9.44–11.5 V - Breakdown threshold range ensuring reliable turn-on under surge conditions |
| VC @ IPPM=20A | 15.9 V - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient per Fig.5 |
| IR @ VWM | <1 μA - Ultra-low leakage preserves signal integrity and battery life in standby |
| TJ max | +150 °C - Junction temperature limit enabling use in under-hood automotive environments |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.210g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to lower-potential side (e.g., GND or return path) in unidirectional TVS placement |
| Cathode | Clamping terminal / surge sink | Connected to protected line (e.g., 12V rail); conducts reverse surge current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ISO 7637-2 compliance | Withstands standardized automotive transients (Pulse 1, 2a, 2b, 3a, 3b) without degradation |
| Fast response time | <1.0 ps rise-to-breakdown ensures clamping before sensitive ICs experience overstress |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 15.9V. Use Value: Limits peak voltage to 15.9V at 20A, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Shielding 24V digital input modules from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS on each channel input to absorb ±2kV ESD (IEC 61000-4-2) and inductive kickback. Use Value: Sub-1μA leakage avoids false triggering; DO-214AB footprint supports high-density PCB layout. |
| Telecom DC Power Input | Consumer USB-C Power Delivery |
Use Scenario: Safeguarding PoE-powered equipment front-end against lightning-induced surges on 48V DC lines. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter, rated for 1500W non-repetitive pulses. Use Value: 15.9V clamping at 20A enables coordination with secondary TVS or crowbar circuits for staged protection. | Use Scenario: Overvoltage protection on VBUS line of USB-C receptacles exposed to adapter fault conditions. IC Role / Device Role / Timing Role: Fast-reacting unidirectional suppressor between VBUS and chassis ground, leveraging low capacitance. Use Value: 9.44–11.5V VBR ensures activation before USB PD 5V/9V/15V/20V rails exceed safe margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A | 600W rating, SMB package (smaller footprint, lower thermal mass) | Lower peak power handling limits use to sub-10A surge environments | Select when board space is constrained and surge energy is ≤600W |
| 1.5KE8.5CA | Through-hole TO-218 package, bidirectional, 1500W rating | Lacks AEC-Q101 qualification and ISO 7637-2 validation | Prefer for legacy through-hole designs where automotive qualification is not required |
Compared with SMCJ8.5CH, SMBJ8.5A offers reduced board area but sacrifices 60% peak power margin, while 1.5KE8.5CA delivers equivalent power in through-hole form but omits automotive-grade validation and surface-mount compatibility.
Availability
SMCJ8.5CH is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply, AEC-Q101 compliance, and ISO 7637-2 validated surge immunity.
Supply support for SMCJ8.5CH 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 power management devices.
The SMCJ series was designed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 reliability, fast clamping response, and robust package construction.
FAQ
What is the polarity configuration of the SMCJ8.5CH?
The SMCJ8.5CH is a unidirectional TVS diode, marked with a cathode band indicating the clamping terminal. It conducts in forward bias (anode-to-cathode) like a standard diode and clamps reverse surges by avalanche breakdown across the junction. This configuration is intended for DC line protection where polarity is fixed, unlike bidirectional variants (e.g., SMCJ8.5CAH) used in AC or floating-signal applications.
Does the SMCJ8.5CH meet automotive qualification standards?
Yes, the SMCJ8.5CH is AEC-Q101 qualified and explicitly validated per ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b waveforms. These certifications confirm its suitability for engine control units, body electronics, and infotainment systems subject to automotive electrical transients, including load dump and battery reversal scenarios.
What is the maximum clamping voltage of the SMCJ8.5CH at rated surge current?
The SMCJ8.5CH has a maximum clamping voltage (VC) of 15.9 V at 20 A peak pulse current (IPPM) under the 10/1000 μs waveform defined in Fig.5. This value is guaranteed across temperature and process variation, and defines the upper voltage limit imposed on protected circuitry during transient events.
How does the SMCJ8.5CH compare to the SMCJ8.5AH variant?
The SMCJ8.5CH differs from SMCJ8.5AH in breakdown voltage tightness: SMCJ8.5CH specifies VBR = 9.44–11.5 V, while SMCJ8.5AH narrows it to 9.44–10.4 V. Both share identical VWM = 8.5 V, VC = 15.9 V, and packaging. The 'H' suffix denotes high-temperature stability; 'C' indicates tighter VBR tolerance for precision clamping applications.
Is the SMCJ8.5CH compatible with lead-free reflow soldering processes?
Yes, the SMCJ8.5CH features matte tin-plated leads compliant with J-STD-002 for solderability and meets JESD201 Class 2 for whisker resistance. Its DO-214AB package is rated for standard Pb-free reflow profiles (peak ~260°C), and moisture sensitivity level is rated at Level 1 per J-STD-020-no baking required prior to assembly.
SMCJ8.5CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 99A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ8.5CH FAQ
1.How can I place an order for SMCJ8.5CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CH 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 SMCJ8.5CH reliable?
The price and inventory of SMCJ8.5CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5CH is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CH?
SMCJ8.5CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CH 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 SMCJ8.5CH?
For technical support, including SMCJ8.5CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CH requirements.
6.How does Aetrix verify that SMCJ8.5CH is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CH 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 SMCJ8.5CH meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CH?
All SMCJ8.5CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CH, 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 SMCJ8.5CH part is unused and in its original packaging.
Return procedure for SMCJ8.5CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CH Tags
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