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Taiwan Semiconductor Corporation SMCJ8.5C
- Part No.:
- SMCJ8.5C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5C.pdf
- Description:
- 1500W, 10.5V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,238
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Product details
Overview
SMCJ8.5C from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in DC power rails and signal lines. It features a working stand-off voltage of 8.5 V, minimum breakdown voltage of 9.44 V, maximum clamping voltage of 15.9 V at 20 A peak pulse current, and operates across -55°C to +150°C junction temperature range. It is used in automotive infotainment power inputs to absorb ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ8.5C datasheet, SMCJ8.5C pinout, SMCJ8.5C application, or SMCJ8.5C equivalent, key selection criteria include unidirectional vs. bidirectional configuration (C suffix = bidirectional), clamping performance under 10/1000 µs waveform, compliance with ISO 7637-2 immunity requirements, and DO-214AB (SMC) package thermal and mechanical compatibility.
Technical Context
The SMCJ8.5C implements a silicon avalanche diode structure with glass-passivated junction, enabling sub-1 ps response time from 0 V to VBR min. Its bidirectional configuration supports symmetrical clamping in both polarities, making it suitable for AC-coupled or floating signal paths where polarity reversal may occur.
It delivers 1500 W peak pulse power per 10/1000 µs waveform at TA = 25°C, with thermal derating above ambient per Fig.2 and junction-to-ambient thermal resistance of 55°C/W. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards for its DO-214AB molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for safe DC bias in protected circuit |
| VBR @ IT = 1 mA | 9.44–11.5 V - Breakdown voltage range confirming reliable avalanche initiation at defined test current |
| VC @ IPPM = 20 A | 15.9 V - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream ICs |
| PPK | 1500 W - Peak pulse power handling capability per standard 10/1000 µs waveform; determines survivability against high-energy transients |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures minimal quiescent power loss and no interference with low-power sensing circuits |
| TJ Range | -55°C to +150°C - Operating junction temperature range supporting under-hood automotive and industrial environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.210 g mass, matte tin-plated leads, and J-STD-002 solderability |
Pinout & Package
DO-214AB (SMC) package: surface-mount, dual-leaded, cathode-banded case for unidirectional variants; SMCJ8.5C is bidirectional and marked without polarity band. Leads are matte tin-plated, compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Molding compound meets UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional polarity - either terminal accepts positive or negative transient; enables placement without orientation check on PCB |
| Case (body) | Non-electrical mechanical interface | Thermally conductive but electrically isolated housing; requires adequate copper pour for heat dissipation per RθJA = 55°C/W |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated clamping performance against standardized automotive load-dump and inductive-switching transients |
| Glass-passivated junction | Enhanced long-term reliability and stable VBR under humidity and thermal cycling stress |
| <1 ps response time | Ensures clamping activation before transient edge propagates into sensitive logic or analog circuitry |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for automotive and industrial end equipment |
| Moisture sensitivity level 1 (J-STD-020) | Zero floor-life limitation - can be mounted directly from dry pack without baking |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery rail in vehicle infotainment head unit exposed to ISO 7637-2 Pulse 2b (alternator load dump) and Pulse 3b (capacitive coupling noise). IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converter input to limit transient overvoltage to ≤15.9 V. Use Value: Prevents latch-up or gate oxide damage in buck controller ICs by limiting surge-induced overvoltage within safe operating area. |
Use Scenario: 4–20 mA current-loop sensor interface in factory automation PLC I/O module subjected to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Bidirectional shunt clamp on twisted-pair analog input, symmetrically suppressing ±1 kV/5 kHz EFT pulses. Use Value: Maintains signal integrity below 1% error band during transients by clamping differential-mode surges before they reach op-amp front-end. |
| LED Driver Output Protection | USB Port ESD Protection |
Use Scenario: Constant-current LED driver output in outdoor signage exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: High-power TVS placed across LED string terminals to absorb repetitive 1500 W surges without degradation. Use Value: Extends LED module lifetime by preventing catastrophic open-circuit failure caused by overvoltage-induced bond-wire fusing. |
Use Scenario: VBUS line of USB 2.0 Type-A port in medical handheld device requiring IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) ESD robustness. IC Role / Device Role / Timing Role: Secondary-level TVS after primary common-mode choke, clamping differential VBUS-to-GND transients. Use Value: Limits VBUS overshoot to <16 V during ±8 kV contact discharge, protecting USB PHY transceiver from junction breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CA (ON Semiconductor) | Lower PPK = 400 W; VC = 14.4 V @ 27.5 A; DO-214AC (SMA) package (smaller footprint, higher RθJA) | Not suitable for ISO 7637-2 Pulse 1/2a where energy exceeds 400 W; limited to lower-energy ESD/EFT scenarios | Select SMCJ8.5C when system-level surge testing requires ≥1500 W rating and DO-214AB thermal mass |
| 1.5KE8.5CA (Littelfuse) | Through-hole TO-218 package; same VWM/VBR/VC; PPK = 1500 W; slower response (~1 ns) | Requires PCB through-holes and reflow-compatible lead finish; unsuitable for fully SMT production | Choose SMCJ8.5C for automated SMT assembly, space-constrained boards, and sub-1 ps response-critical designs |
Compared with SMAJ8.5CA and 1.5KE8.5CA, the SMCJ8.5C uniquely combines 1500 W surge rating, DO-214AB SMT package, bidirectional symmetry, and sub-1 ps response-making it optimal for automotive and industrial SMT systems requiring full ISO 7637-2 compliance without layout or process compromise.
Availability
SMCJ8.5C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, LED driver output safeguarding, and USB VBUS transient suppression requiring stable component supply and full traceability.
Supply support for SMCJ8.5C 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 for automotive, industrial, and consumer applications.
The SMCJ series belongs to TSC's high-power surface-mount TVS portfolio, engineered specifically to meet stringent ISO 7637-2 immunity requirements in automotive electronics while maintaining RoHS and halogen-free compliance.
FAQ
What does the 'C' suffix indicate in SMCJ8.5C?
The 'C' suffix in SMCJ8.5C denotes bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional SMCJ8.5A (which has anode/cathode polarity), the SMCJ8.5C has no polarity marking and functions identically regardless of voltage polarity applied across its terminals. This makes SMCJ8.5C ideal for AC-coupled lines or floating interfaces where polarity reversal is possible.
What is the maximum clamping voltage of SMCJ8.5C and under what test condition?
The maximum clamping voltage of SMCJ8.5C is 15.9 V, measured at a peak pulse current (IPPM) of 20 A using the standardized 10/1000 µs double-exponential waveform per Fig.5 in the datasheet. This value represents the worst-case voltage imposed on downstream circuitry during a high-energy transient event and is critical for ensuring protected ICs remain within their absolute maximum ratings.
Is SMCJ8.5C compliant with automotive transient immunity standards?
Yes, SMCJ8.5C is explicitly validated to meet ISO 7637-2 for automotive electrical disturbances, covering Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (alternator field decay), Pulse 3a (capacitive coupled burst), and Pulse 3b (inductive coupled burst). Its 1500 W peak power rating and fast sub-1 ps response ensure robust suppression of these standardized transients without degradation.
What is the thermal resistance profile of SMCJ8.5C and how does it affect PCB layout?
SMCJ8.5C has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain TJ ≤ 150°C under repeated 1500 W surges, the PCB must provide sufficient copper area - typically ≥100 mm² of 2 oz. copper connected to both pads - to dissipate heat. Insufficient copper increases effective RθJA, risking thermal runaway during high-duty-cycle transients.
How does SMCJ8.5C differ from SMCJ8.5A in terms of electrical behavior and use cases?
SMCJ8.5A is unidirectional with a cathode band and conducts only during reverse-biased transients, while SMCJ8.5C is bidirectional and clamps equally in both directions. Electrically, SMCJ8.5C exhibits identical VWM, VBR, and VC specs but lacks polarity-dependent forward conduction. Use SMCJ8.5C for AC signals, floating buses, or any application where voltage polarity cannot be guaranteed - whereas SMCJ8.5A suits DC rails with known polarity and tighter leakage control in forward bias.
SMCJ8.5C 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):
- 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)
SMCJ8.5C FAQ
1.How can I place an order for SMCJ8.5C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5C 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 SMCJ8.5C reliable?
The price and inventory of SMCJ8.5C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5C is usually 5 days.
3.What payment methods are accepted for SMCJ8.5C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5C?
SMCJ8.5C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5C 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 SMCJ8.5C?
For technical support, including SMCJ8.5C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5C requirements.
6.How does Aetrix verify that SMCJ8.5C is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5C 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 SMCJ8.5C meets industry standards.
7.What is the process for return or replacement of SMCJ8.5C?
All SMCJ8.5C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5C, 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 SMCJ8.5C part is unused and in its original packaging.
Return procedure for SMCJ8.5C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5C Tags
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