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Taiwan Semiconductor Corporation SMCJ8.5CAH
- Part No.:
- SMCJ8.5CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CAH.pdf
- Description:
- 1500W, 9.9V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,122
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Product details
Overview
SMCJ8.5CAH from Taiwan Semiconductor is a bidirectional 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 ESD, load dump, and ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ8.5CAH datasheet, SMCJ8.5CAH pinout, SMCJ8.5CAH application, or SMCJ8.5CAH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under 10/1000μs surge, thermal resistance data, and direct alternatives for bidirectional TVS selection in harsh-environment designs.
Technical Context
The SMCJ8.5CAH employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at 8.5V). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal lines without polarity constraints.
Rated for 1500W peak pulse power (10/1000μs waveform), it sustains 20A peak impulse current with 14.4V clamping voltage and operates across –55°C to +150°C junction temperature range. Thermal design is supported by RθJC = 10°C/W and RθJA = 55°C/W ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC/AC RMS operating margin. |
| VBR @ IT=1mA | 9.44–10.4 V - Verified breakdown threshold ensuring reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM=20A | 14.4 V - Clamped voltage under 10/1000μs surge; determines protected circuit's maximum overvoltage exposure. |
| PPK | 1500 W - Peak pulse power handling per single event; supports robust immunity to ISO 7637-2 Pulse 2b (load dump) and lightning-induced surges. |
| IR @ VWM | <1 μA - Ultra-low reverse leakage ensures minimal standby power loss and signal integrity in high-impedance interfaces. |
| TJ max | +150 °C - Enables operation in under-hood automotive, motor drive, and industrial control environments without derating. |
| RθJC | 10 °C/W - Confirmed junction-to-case thermal resistance supporting heatsink-assisted power dissipation in high-repetition scenarios. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry means band denotes terminal orientation only, not functional polarity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (marked band) | Transient conduction path | Both terminals conduct identically in reverse bias; band identifies physical terminal location for consistent PCB layout and automated placement. |
| Cathode band side | Reference marking point | Used for orientation verification during AOI inspection and reflow alignment; no functional asymmetry in bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in ADAS, body control, and powertrain modules. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability under humidity and thermal stress per J-STD-020 Level 1. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection/load dump), and Pulse 3a/3b (line impedance switching) waveforms without external conditioning. |
| Fast response time | <1.0 ps from 0 V to VBR min-limits voltage overshoot during nanosecond-scale ESD events (IEC 61000-4-2 Level 4). |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU-supports green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump transients up to 35V and ISO 7637-2 Pulse 2b. IC Role / Device Role / Timing Role: Bidirectional clamping device placed at power entry point to limit rail voltage excursion during alternator regulation failure. Use Value: Limits peak voltage to 14.4V at 20A, preventing damage to downstream 16V-rated LDOs and microcontrollers without requiring series impedance. |
Use Scenario: Safeguarding 24V digital input channels in programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Transient suppression element across input terminals to absorb 10/1000μs surges induced by relay coil de-energization. Use Value: Clamps transients within 1 ns, maintaining signal integrity for 10 kHz sampling inputs while surviving >100,000 surge events per MIL-STD-883H Method 3015.7. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers on outdoor telecom nodes from lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across A/B bus lines to clamp mode conversion artifacts. Use Value: Symmetrical 14.4V clamping ensures balanced voltage swing preservation and prevents receiver saturation during 1kV/0.5kA surge injection. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances operating on 12–24V DC supplies. IC Role / Device Role / Timing Role: Rail clamp mounted directly at motor driver IC supply pins to shunt back-EMF energy during PWM switching transitions. Use Value: 1500W peak rating handles repetitive 50A spike bursts at 20kHz PWM frequency without thermal runaway or parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ8.5CA | Same DO-214AC (SMA) package, 14.4V VC @ 20A, but lower PPK = 400W; higher RθJA = 85°C/W. | Not suitable for ISO 7637-2 Pulse 2b; limited to low-energy ESD-only protection in space-constrained consumer PCBs. | Select when board area is critical and surge energy is ≤200 mJ; verify thermal margin with ambient >70°C. |
| ON Semiconductor 1.5KE8.5CA | Through-hole DO-15 package, identical 1500W rating and 14.4V VC, but slower response (~1ns) and no AEC-Q101 qualification. | Acceptable for industrial mains-powered equipment where vibration resistance and automated assembly are not required. | Choose for legacy through-hole designs or cost-sensitive non-automotive applications; avoid in automotive or high-vibration environments. |
Compared with SMAJ8.5CA and 1.5KE8.5CA, the SMCJ8.5CAH delivers superior thermal performance (RθJA = 55°C/W), AEC-Q101 validation, and surface-mount compatibility-making it the preferred choice for automotive and high-reliability industrial designs requiring repeatable surge immunity and automated production.
Availability
SMCJ8.5CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom infrastructure, and consumer appliance designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ8.5CAH 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 developed specifically for high-energy transient suppression in automotive and industrial systems, emphasizing AEC-Q101 compliance, tight VBR tolerance, and robust surge endurance under real-world EMI/EMC stress conditions.
FAQ
What is the clamping voltage of SMCJ8.5CAH at its rated peak pulse current?
The SMCJ8.5CAH has a maximum clamping voltage (VC) of 14.4 V when subjected to a 20 A peak pulse current with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the official Taiwan Semiconductor datasheet revision A2102, ensuring predictable overvoltage limiting for downstream 12V-rated ICs.
Is SMCJ8.5CAH qualified for automotive applications?
Yes, the SMCJ8.5CAH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114. This certification validates its suitability for under-hood and chassis-mounted automotive modules such as body control units and ADAS sensor interfaces.
How does the bidirectional configuration of SMCJ8.5CAH affect its circuit implementation?
The SMCJ8.5CAH provides symmetrical clamping in both directions, eliminating polarity concerns during placement. Unlike unidirectional variants (e.g., SMCJ8.5H), it requires no orientation alignment relative to DC bias-ideal for AC-coupled lines, differential buses, or floating grounds where voltage polarity may reverse during fault conditions.
What is the maximum steady-state power dissipation for SMCJ8.5CAH?
The SMCJ8.5CAH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value reflects continuous DC or low-frequency power handling capability-not surge-related-and must be derated linearly above 25°C using the specified RθJA = 55°C/W thermal resistance.
Does SMCJ8.5CAH meet ISO 7637-2 test requirements?
Yes, the SMCJ8.5CAH is explicitly stated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms. Its 1500W peak power rating and 14.4V clamping voltage ensure compliance without additional external components, enabling direct integration into automotive power network protection schemes.
SMCJ8.5CAH 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:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 109A
- 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)
SMCJ8.5CAH FAQ
1.How can I place an order for SMCJ8.5CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CAH 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 SMCJ8.5CAH reliable?
The price and inventory of SMCJ8.5CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5CAH is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CAH?
SMCJ8.5CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CAH 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 SMCJ8.5CAH?
For technical support, including SMCJ8.5CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CAH requirements.
6.How does Aetrix verify that SMCJ8.5CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CAH 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 SMCJ8.5CAH meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CAH?
All SMCJ8.5CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CAH, 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 SMCJ8.5CAH part is unused and in its original packaging.
Return procedure for SMCJ8.5CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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