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Taiwan Semiconductor Corporation SMCJ8.5A
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- Part No.:
- SMCJ8.5A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,509
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Product details
Overview
SMCJ8.5A 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, 9.44–10.4V breakdown voltage at 1mA, and 14.4V maximum clamping voltage at 20A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ8.5A datasheet, SMCJ8.5A pinout, SMCJ8.5A application, or SMCJ8.5A equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, junction temperature derating above 25°C, unidirectional polarity marking, and compliance with EFT immunity standards for 12V battery-supplied systems.
Technical Context
The SMCJ8.5A uses a glass-passivated silicon junction optimized for sub-nanosecond response (<1.0 ps from 0 V to VBR min), enabling suppression of fast-rising ESD and load-dump transients before downstream circuitry is damaged. Its 10°C/W junction-to-case thermal resistance supports sustained surge handling under PCB copper pour conditions.
Designed for unidirectional operation only, it features a cathode band marking per DO-214AB mechanical drawing, with steady-state power dissipation rated at 5W and maximum junction temperature of +150°C. Reverse leakage remains below 1 µA at 8.5V, ensuring minimal standby current draw in always-on automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage begins; sets upper limit for protected line nominal voltage (e.g., 5V/8V logic rails). |
| VBR @ IT=1mA | 9.44–10.4 V - Breakdown threshold range; ensures reliable conduction onset during transients while avoiding false triggering on ripple or overshoot. |
| VC @ IPPM=20A | 14.4 V - Clamped voltage during 10/1000µs surge; defines worst-case overvoltage seen by downstream ICs during 1500W transient events. |
| PPK | 1500 W - Peak pulse power rating per 1ms non-repetitive waveform (Fig.5); determines survivability against ISO 7637-2 Pulse 5a load dump surges. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; enables use in low-power sensor nodes without compromising battery life. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments with proper thermal layout. |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, moisture sensitivity level 1 (per J-STD-020), and UL 94V-0 molding compound. Cathode indicated by band marking on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; must be routed with short, wide traces to minimize inductance during clamping. |
| Cathode | Protected line input | Connected directly to the line being protected (e.g., 12V supply rail); polarity-sensitive - reversal prevents clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure in automotive ECUs. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (EFT), eliminating need for additional external filtering. |
| Sub-1ps response time | Clamps transients before propagation into sensitive analog front-ends or microcontroller I/O pins, preserving signal integrity in CAN/LIN bus interfaces. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU, supporting green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12V power input of BCM microcontroller from load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 12V rail and local DC/DC converter input. Use Value: Limits clamped voltage to 14.4V, staying within 16V absolute maximum rating of typical buck controller ICs and preventing latch-up. | Use Scenario: Shielding 24V digital input optocoupler stage from inductive kickback when switching solenoid valves. IC Role / Device Role / Timing Role: Primary transient clamp on field-side input trace, upstream of series resistor and opto-LED. Use Value: Absorbs 1500W pulses without degradation, maintaining <1µA leakage to avoid false triggering of high-impedance input comparators. |
| LED Headlamp Driver Power Stage | Smart Meter Battery Backup Circuit |
Use Scenario: Safeguarding MOSFET gate drivers and current-sense amplifiers from ESD and switching noise in automotive LED lighting modules. IC Role / Device Role / Timing Role: Local TVS across driver VDD-GND, placed adjacent to IC power pins. Use Value: Sub-1ps response prevents nanosecond-scale voltage spikes from coupling into gate drive paths and causing unintended FET turn-on. | Use Scenario: Protecting supercapacitor charging circuitry from EFT bursts during mains-connected meter communication events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 3.3V backup rail feeding real-time clock and SRAM. Use Value: 8.5V VWM allows safe operation with 3.3V system while providing headroom for 10V-level transients common in smart grid environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A | 600W peak power rating, same VWM/VBR/VC specs, SMB package (smaller footprint, higher thermal resistance). | Lower surge capacity suits consumer-grade 5V USB peripherals but insufficient for automotive load-dump events. | Select SMCJ8.5A when ISO 7637-2 Pulse 5a (12V system) or 1500W single-pulse robustness is required. |
| 1.5SMC8.5A | Identical electrical specs and DO-214AB package; manufactured by ON Semiconductor with identical marking code GDT and thermal performance. | No functional difference; qualified for same automotive and industrial applications per respective AEC-Q200 stress test reports. | Drop-in alternative with identical board layout and BOM substitution; verify manufacturer-specific qualification status for safety-critical programs. |
Compared with SMBJ8.5A, the SMCJ8.5A delivers 2.5× higher peak power handling essential for automotive 12V systems, while 1.5SMC8.5A offers identical performance with alternate supply-chain sourcing-both require no PCB changes but differ in qualification documentation and long-term availability planning.
Availability
SMCJ8.5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, LED lighting drivers, and smart utility meter designs requiring stable component supply across extended temperature ranges and high-reliability surge environments.
Supply support for SMCJ8.5A 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and computing markets.
The SMCJ series was developed specifically for high-energy transient suppression in 12V/24V automotive and heavy-industrial power systems, emphasizing ISO 7637-2 compliance, low clamping ratio, and robust thermal performance in surface-mount packages.
FAQ
What is the maximum clamping voltage of the SMCJ8.5A under standard test conditions?
The SMCJ8.5A has a maximum clamping voltage (VC) of 14.4 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 20 A, as specified in the Taiwan Semiconductor datasheet revision S2104. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is critical for ensuring compatibility with downstream IC absolute maximum ratings. The SMCJ8.5A maintains this clamping performance consistently across its operational temperature range.
Is the SMCJ8.5A suitable for bidirectional transient protection?
No, the SMCJ8.5A is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics apply only in the reverse-biased direction, with a cathode band marking indicating polarity. For bidirectional protection, Taiwan Semiconductor specifies parts with "CA" suffix (e.g., SMCJ8.5CA), which feature symmetrical breakdown in both directions. Using the SMCJ8.5A in a bidirectional configuration risks failure during positive-going transients, as it lacks forward conduction capability beyond its 3.5 V forward voltage rating.
What is the thermal resistance profile of the SMCJ8.5A, and how does it affect PCB layout?
The SMCJ8.5A has a junction-to-case thermal resistance (RθJC) of 10°C/W and a junction-to-ambient resistance (RθJA) of 55°C/W at 25°C ambient, per the S2104 datasheet. These values indicate that effective heat dissipation requires direct thermal connection of the cathode/anode pads to internal or external copper planes. To maintain TJ ≤ 150°C during repetitive surges, designers must allocate ≥ 100 mm² of 2-oz copper per pad and avoid narrow traces; the SMCJ8.5A's thermal performance is highly dependent on PCB layout, not just package construction.
Does the SMCJ8.5A meet automotive qualification standards such as AEC-Q200?
The SMCJ8.5A is designed to meet ISO 7637-2 transient immunity requirements (Pulse 1/2a/2b/3a/3b) and is widely deployed in automotive applications, but Taiwan Semiconductor does not publish AEC-Q200 qualification data for this specific part in public documentation. Customers requiring formal AEC-Q200 compliance should consult TSC's component qualification reports or consider functionally equivalent AEC-Q200-qualified alternatives like the 1.5SMC8.5A from ON Semiconductor. The SMCJ8.5A's construction-glass passivation, J-STD-020 Level 1 moisture sensitivity, and -55°C to +150°C operating range-supports automotive use, though formal qualification status must be verified per program requirements.
How does the SMCJ8.5A compare to the SMCJ8.0A in terms of stand-off voltage and system compatibility?
The SMCJ8.5A has a working stand-off voltage (VWM) of 8.5 V versus 8.0 V for the SMCJ8.0A, making it better suited for 9–10 V nominal supply rails where margin against false triggering is critical. Both share identical 1500W peak power and DO-214AB packaging, but the SMCJ8.5A's higher VWM reduces risk of leakage-induced power loss in 8.5–9.0 V systems such as certain automotive sensor modules. System designers selecting between them must match VWM to the maximum steady-state voltage of the protected line, as exceeding VWM causes measurable leakage; the SMCJ8.5A provides tighter alignment with 9V logic rails than the SMCJ8.0A.
SMCJ8.5A 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:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 109A
- 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)
SMCJ8.5A FAQ
1.How can I place an order for SMCJ8.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5A 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 SMCJ8.5A reliable?
The price and inventory of SMCJ8.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5A is usually 5 days.
3.What payment methods are accepted for SMCJ8.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5A?
SMCJ8.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5A 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 SMCJ8.5A?
For technical support, including SMCJ8.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5A requirements.
6.How does Aetrix verify that SMCJ8.5A is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5A 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 SMCJ8.5A meets industry standards.
7.What is the process for return or replacement of SMCJ8.5A?
All SMCJ8.5A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5A, 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 SMCJ8.5A part is unused and in its original packaging.
Return procedure for SMCJ8.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5A Tags
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