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Taiwan Semiconductor Corporation SMCJ8.5H
- Part No.:
- SMCJ8.5H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5H.pdf
- Description:
- 1500W, 10.5V, UNIDIRECTIONAL, TV
- Quantity:
- Payment:
- Shipping:
Inventory:4,329
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Product details
Overview
SMCJ8.5H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 9.44–11.5V breakdown voltage (VBR), 8.5V working stand-off voltage (VWM), and 15.9V maximum clamping voltage (VC) at 20A peak pulse current - designed for ESD and lightning surge protection in automotive power rails and industrial I/O interfaces.
For engineers reviewing the SMCJ8.5H datasheet, SMCJ8.5H pinout, SMCJ8.5H application, or SMCJ8.5H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, ISO 7637-2 compliance, thermal resistance values, and real-world design implications for transient suppression in 12V automotive systems and DC-powered sensor nodes.
Technical Context
The SMCJ8.5H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (9.44–11.5V @ 1mA), clamping transients to ≤15.9V within <1.0ps response time. It sustains 1500W peak pulse power (10/1000μs waveform) and exhibits <1μA leakage at 8.5V.
Its glass-passivated junction ensures stable breakdown characteristics across -55°C to +150°C junction temperature range, while DO-214AB packaging supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below 12V nominal rail. |
| VBR min/max | 9.44 / 11.5 V @ 1 mA - Confirmed breakdown threshold range; defines turn-on consistency across production lot. |
| VC @ IPPM | 15.9 V @ 20 A - Clamped voltage during 10/1000μs surge; determines protected circuit's maximum transient exposure. |
| PPK | 1500 W - Peak pulse power handling per single event; enables robustness against ISO 7637-2 Pulse 1/2a/2b/3a/3b. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss and signal integrity. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs PCB copper area requirements for sustained surge duty cycles. |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking; two-terminal device (anode and cathode) optimized for high-current transient shunting. Matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path terminal | Connected to system ground or low-side reference in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V supply rail); conducts only during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC standard. |
| ISO 7637-2 compliant | Withstands defined load-dump and inductive-switching transients (Pulse 1, 2a, 2b, 3a, 3b) without degradation. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal/humidity stress. |
| Fast response time | <1.0 ps rise time enables clamping before sensitive ICs experience damaging overvoltage. |
| Moisture sensitivity level 1 | Zero floor-life limitation; no baking required prior to reflow assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs, body control modules, and lighting drivers from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges above 12V rail. Use Value: Limits voltage seen by downstream regulators and microcontrollers to ≤15.9V, preventing latch-up or gate oxide damage. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) on PLC I/O cards from ESD and field-wiring induced transients. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal lines referenced to local ground. Use Value: Maintains signal integrity by suppressing ±8kV contact ESD (IEC 61000-4-2) and fast-rising switching noise before amplification. |
| Telecom DC Power Input Protection | Consumer Device USB Power Port Protection |
Use Scenario: Safeguarding 12V/24V DC inputs of PoE-powered switches, base stations, and remote radio units. IC Role / Device Role / Timing Role: Primary surge clamp on main DC input rail upstream of DC-DC converters. Use Value: Absorbs up to 1500W peak energy from lightning-induced surges (IEC 61000-4-5), preserving converter FETs and feedback circuitry. | Use Scenario: Adding secondary overvoltage protection to USB-C PD power delivery paths in portable monitors and docking stations. IC Role / Device Role / Timing Role: Backup clamping device after primary OVP IC, guarding against fault-mode voltage overshoot. Use Value: Activates at 9.44V to clamp abnormal 20V PD faults to ≤15.9V, preventing damage to USB controller and display driver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A | 600W rating, SMA package (smaller footprint), higher RθJA (85°C/W), lower IPPM (10.4A) | Suitable for space-constrained consumer boards with lower surge severity; not AEC-Q101 qualified | Select for cost-sensitive non-automotive designs where 600W peak power suffices. |
| TPSMD8.5 | 1500W rating, same DO-214AB package, but bidirectional configuration (±8.5V VWM), higher VC (17.5V) | Required for AC-coupled or dual-polarity signal lines; unsuitable for unidirectional DC rail protection | Choose only when protecting symmetric signals or when reverse polarity must be suppressed. |
Compared with SMAJ8.5A and TPSMD8.5, the SMCJ8.5H provides automotive-grade reliability (AEC-Q101), superior surge margin (1500W vs. 600W), and optimal unidirectional clamping for 12V DC systems - making it the preferred choice for under-hood and industrial power rail protection where failure modes demand highest robustness.
Availability
SMCJ8.5H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMCJ8.5H 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 - with global distribution and AEC-Q101 validation capability.
The SMCJ8.5H belongs to TSC's high-power surface-mount TVS family engineered specifically for automotive and industrial transient immunity, emphasizing ruggedness, repeatable clamping, and compliance with ISO 7637-2 and AEC-Q101.
FAQ
What is the breakdown voltage range of the SMCJ8.5H?
The SMCJ8.5H has a guaranteed breakdown voltage (VBR) range of 9.44 V to 11.5 V measured at 1 mA test current. This range reflects manufacturing tolerance and ensures reliable turn-on behavior across temperature and lifetime - critical for consistent protection of 12V automotive systems where the SMCJ8.5H is commonly deployed.
Is the SMCJ8.5H suitable for automotive applications?
Yes, the SMCJ8.5H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming its suitability for automotive power rail and signal line protection. Its DO-214AB package, -55°C to +150°C operating range, and glass-passivated junction further support under-hood deployment in ECUs and body electronics using the SMCJ8.5H.
What is the maximum clamping voltage of the SMCJ8.5H during a surge event?
The SMCJ8.5H clamps to a maximum of 15.9 V at 20 A peak pulse current (10/1000μs waveform). This value - specified as VC@IPPM - defines the upper voltage limit imposed on protected circuits during standardized surge events, ensuring downstream components like LDOs and MCUs remain within safe operating limits when the SMCJ8.5H activates.
Does the SMCJ8.5H have polarity marking, and how is it identified?
Yes, the SMCJ8.5H features a cathode band marking on the DO-214AB package body, indicating the cathode terminal. In unidirectional configuration, the cathode connects to the line being protected (e.g., 12V rail), and the anode connects to ground. This polarity must be observed during PCB layout to ensure proper clamping function of the SMCJ8.5H.
How does the SMCJ8.5H compare to lower-power TVS diodes like SMAJ8.5A?
The SMCJ8.5H delivers 1500W peak pulse power versus 600W for SMAJ8.5A, enabling higher-energy transient absorption in demanding environments. It also carries AEC-Q101 qualification and lower thermal resistance (RθJA = 55°C/W vs. 85°C/W), making the SMCJ8.5H the appropriate choice for automotive and industrial applications where sustained surge robustness and reliability are mandatory - unlike consumer-grade alternatives.
SMCJ8.5H 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:
- 1
- Bidirectional Channels:
- -
- 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:
- 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)
SMCJ8.5H FAQ
1.How can I place an order for SMCJ8.5H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5H 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 SMCJ8.5H reliable?
The price and inventory of SMCJ8.5H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5H is usually 5 days.
3.What payment methods are accepted for SMCJ8.5H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5H?
SMCJ8.5H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5H 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 SMCJ8.5H?
For technical support, including SMCJ8.5H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5H requirements.
6.How does Aetrix verify that SMCJ8.5H is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5H 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 SMCJ8.5H meets industry standards.
7.What is the process for return or replacement of SMCJ8.5H?
All SMCJ8.5H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5H, 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 SMCJ8.5H part is unused and in its original packaging.
Return procedure for SMCJ8.5H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5H Tags
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