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Taiwan Semiconductor Corporation SMCJ8.5
- Part No.:
- SMCJ8.5
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5.pdf
- Description:
- 1500W, 10.5V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:2,850
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Product details
Overview
SMCJ8.5 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 8.5V working stand-off voltage (VWM), 9.44–11.5V breakdown voltage (VBR), and 15.9V maximum clamping voltage (VC) at 20A peak impulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ8.5 datasheet, SMCJ8.5 pinout, SMCJ8.5 application, or SMCJ8.5 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 compatibility with automated SMT placement on 12V battery-fed systems.
Technical Context
The SMCJ8.5 employs a glass-passivated silicon junction optimized for sub-nanosecond response (<1.0 ps from 0 V to VBR min) and low leakage (<1 µA above 10 V). Its single-die unidirectional structure provides asymmetric conduction - forward VF = 3.5 V at 100 A - enabling robust surge handling without reverse conduction path.
Thermal design relies on RθJA = 55°C/W and RθJC = 10°C/W, supporting continuous operation up to TJ = 150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for high-reliability industrial and automotive PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum DC or continuous reverse operating voltage before clamping initiates; matches 12V system nominal rail with margin. |
| VBR min/max | 9.44–11.5 V @ IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients exceeding VWM by ≥11%. |
| VC @ IPPM | 15.9 V @ 20 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge events per IEC 61000-4-5. |
| PPK | 1500 W - Peak pulse power rating defines maximum transient energy absorption capability at TA = 25°C. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and prevents false triggering in always-on circuits. |
| TJ max | 150 °C - Maximum junction temperature enables operation in engine-bay or enclosed industrial enclosures. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210 g. Moisture sensitivity level: MSL 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; conducts during positive surges when cathode is biased higher. |
| Cathode | Clamping reference terminal | Connected to protected line (e.g., 12V rail); initiates avalanche breakdown when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - required for automotive ECU front-end protection. |
| Sub-1 ps response time | Enables clamping before sensitive downstream logic or analog circuitry experiences overvoltage - critical for CAN/LIN bus interface ICs. |
| MSL 1 rating | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time in high-volume SMT lines. |
| UL 94V-0 molding compound | Ensures flame retardancy in enclosed power modules and lighting drivers where thermal runaway risk exists. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects microcontroller GPIO and LIN transceiver inputs from load-dump spikes during alternator regulation faults. IC Role / Device Role: Unidirectional TVS placed between 12V supply rail and ground, upstream of LDO input. Use Value: Limits clamped voltage to 15.9 V, ensuring downstream 16V-rated LDOs remain within absolute maximum ratings during 35 V/100 ms transients. |
Use Scenario: Shields 24V digital input optocoupler circuitry from relay coil flyback and EFT bursts in factory automation cabinets. IC Role / Device Role: Standoff protection on field-side input terminals, rated for repeated 20A/10/1000 µs surges. Use Value: 1500 W peak power rating sustains >1000 surge events without degradation, meeting IEC 61000-4-4 Level 4 immunity requirements. |
| LED Streetlight Power Supply | Automotive HVAC Blower Motor Driver |
Use Scenario: Suppresses inductive kickback from PFC choke and MOSFET switching noise coupled into AC/DC controller feedback paths. IC Role / Device Role: Secondary-side rail clamp on 12V bias supply feeding PWM controller IC. Use Value: 9.44–11.5 V VBR range ensures stable clamping onset without premature conduction during normal 12V ripple (±10%). |
Use Scenario: Guards half-bridge gate driver ICs from voltage overshoot caused by motor winding inductance during PWM commutation. IC Role / Device Role: Bidirectional protection not applicable; SMCJ8.5 used as unidirectional clamp on low-side switch source node. Use Value: 3.5 V forward voltage at 100 A enables safe freewheeling path during shoot-through fault conditions without thermal runaway. |
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 | Lower PPK (600 W), smaller SMB package (DO-214AA), tighter VBR tolerance (9.44–10.4 V), same VWM and VC. | Not suitable for 1500 W ISO 7637-2 Pulse 1 events; limited to lower-energy ESD/EFT scenarios. | Select only if board space constraints prevent DO-214AB placement and surge energy is ≤600 W. |
| SMCJ8.5A | Same package and PPK, but tighter VBR (9.44–10.4 V vs. 9.44–11.5 V) and lower VC (14.4 V @ 20 A vs. 15.9 V). | Better clamping margin for 12V systems with strict <15 V downstream limits; identical thermal and mechanical specs. | Preferred where lower clamping voltage improves system-level immunity margin without sacrificing surge rating. |
Compared with SMCJ8.5, SMBJ8.5A trades surge capacity for footprint reduction, while SMCJ8.5A delivers tighter parametric control and improved clamping - both require validation of layout thermal relief and trace inductance to maintain specified performance.
Availability
SMCJ8.5 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, LED lighting drivers, and HVAC motor control systems requiring stable component supply across extended production lifecycles.
Supply support for SMCJ8.5 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 manufacturer specializing in discrete power semiconductors, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMCJ series was developed specifically for high-energy transient suppression in 12V/24V automotive and industrial power systems, emphasizing ISO 7637-2 compliance, MSL 1 reliability, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMCJ8.5 under standard test conditions?
The SMCJ8.5 has a maximum clamping voltage (VC) of 15.9 V when subjected to a 10/1000 µs waveform peak impulse current (IPPM) of 20 A at TA = 25°C. This value is measured per IEC 61000-4-5 and ensures downstream components see no more than 15.9 V during defined surge events. The SMCJ8.5 maintains this clamping performance across its full operating temperature range when derated per the pulse derating curve in the official datasheet.
Is SMCJ8.5 suitable for bidirectional transient protection?
No, SMCJ8.5 is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional protection, the SMCJ8.5C or SMCJ8.5CA variants must be used - these incorporate back-to-back diode configurations. Using SMCJ8.5 in reverse-biased mode beyond its specified VWM (8.5 V) risks permanent damage due to uncontrolled avalanche conduction.
What is the forward voltage drop of SMCJ8.5 at high current?
The SMCJ8.5 exhibits a forward voltage (VF) of 3.5 V at IF = 100 A, as confirmed in the Absolute Maximum Ratings table. This low VF enables effective use as a freewheeling path during inductive switching events, minimizing power dissipation and thermal stress during sustained forward conduction - a key advantage over higher-VF alternatives in motor drive applications.
Does SMCJ8.5 meet automotive qualification standards?
Yes, SMCJ8.5 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical disturbances, and is manufactured to AEC-Q101 stress test guidelines for discrete semiconductors. Its MSL 1 rating, JESD201 Class 2 whisker resistance, and UL 94V-0 package comply with automotive PCB assembly and reliability mandates.
How does SMCJ8.5 compare to SMCJ8.0A in terms of clamping performance?
The SMCJ8.5 clamps at 15.9 V @ 20 A, whereas SMCJ8.0A clamps at 13.6 V @ 50 A. Though SMCJ8.0A offers lower VC, it is rated for a lower VWM (8.0 V) and reduced surge energy margin. SMCJ8.5 provides better system-level margin for 12V nominal rails subject to ±10% variation, while maintaining higher peak power handling (1500 W) than SMCJ8.0A's 1500 W rating - both share identical package and thermal specs.
SMCJ8.5 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ8.5 FAQ
1.How can I place an order for SMCJ8.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5 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 SMCJ8.5 reliable?
The price and inventory of SMCJ8.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5 is usually 5 days.
3.What payment methods are accepted for SMCJ8.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5?
SMCJ8.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5 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 SMCJ8.5?
For technical support, including SMCJ8.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5 requirements.
6.How does Aetrix verify that SMCJ8.5 is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5 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 SMCJ8.5 meets industry standards.
7.What is the process for return or replacement of SMCJ8.5?
All SMCJ8.5 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5, 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 SMCJ8.5 part is unused and in its original packaging.
Return procedure for SMCJ8.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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