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Taiwan Semiconductor Corporation SMCJ85H
- Part No.:
- SMCJ85H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85H.pdf
- Description:
- 1500W, 104.7V, 10%, UNIDIRECTION
- Quantity:
- Payment:
- Shipping:
Inventory:9,284
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Product details
Overview
SMCJ85H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 85V working stand-off voltage (VWM), 94.4–115V breakdown voltage (VBR), and 151V maximum clamping voltage (VC) at 10.4A peak pulse current - designed to protect automotive power electronics against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ85H datasheet, SMCJ85H pinout, SMCJ85H application, or SMCJ85H equivalent, this device is selected for high-energy surge immunity in 12V/24V vehicle subsystems where fast response (<1.0 ps), low leakage (<1 µA @ 85V), AEC-Q101 qualification, and RoHS/halogen-free compliance are mandatory.
Technical Context
The SMCJ85H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (94.4–115V @ 1 mA). It clamps transient energy within 1.0 ps, limiting downstream voltage to ≤151V at 10.4A (10/1000 µs waveform), while maintaining <1 µA leakage at rated 85V stand-off.
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = 150°C. Its glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 94.4 V / 115 V @ 1 mA - Ensures predictable turn-on margin above system nominal voltage |
| VC @ IPPM | 151 V @ 10.4 A - Clamped voltage during 10/1000 µs surge defines protected circuit stress level |
| PPK | 1500 W - Peak pulse power handling capacity per single transient event |
| IR @ VWM | <1 µA - Negligible standby leakage avoids battery drain in always-on automotive modules |
| TJ max | +150 °C - Enables under-hood deployment without derating in engine control units |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Dimensions conform to JEDEC DO-214AB standard; terminals are matte tin-plated for J-STD-002-compliant soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to ground or low-side return in unidirectional TVS placement |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., CAN_H, LIN, 12V rail); marked by band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| ISO 7637-2 compliance | Withstands defined load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| Fast response time | <1.0 ps - Limits voltage overshoot before protection engages |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Distribution | Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of 12V supply inputs in junction boxes and fuse panels exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and upstream regulator input. Use Value: Clamps 151 V at 10.4 A, preventing overvoltage damage to DC-DC converters rated for ≤16V input. | Use Scenario: Surge suppression on LIN bus lines and switched 12V outputs driving door locks, mirrors, and lighting. IC Role / Device Role / Timing Role: Standoff-rated TVS on each protected output trace, referenced to chassis ground. Use Value: Sub-µA leakage preserves sleep-mode current budget; AEC-Q101 ensures 15-year field life. |
| Engine Control Unit (ECU) | Infotainment Power Rail |
Use Scenario: Input protection for microcontroller power domains subjected to cranking-induced dips and ignition coil spikes. IC Role / Device Role / Timing Role: Primary clamping device on main 5V/3.3V LDO inputs after bulk filtering. Use Value: 1500W peak power rating absorbs multiple ISO 7637-2 Pulse 5a events without degradation. | Use Scenario: 12V-to-5V converter input protection in head units and display modules near RF antennas. IC Role / Device Role / Timing Role: First-line defense against ESD and coupled RF transients entering via power connector. Use Value: 1.0 ps response prevents nanosecond-scale overshoot from coupling into sensitive analog audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A | 600W PPK rating, SMA package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select only if space-constrained and surge energy is limited to IEC 61000-4-2/4-5 levels |
| TPSMD8.5A | 1500W PPK, but VWM = 8.5V and VC = 13.6V - not voltage-compatible with 85V systems | Designed for low-voltage data lines (USB, RS-485), not 12V/24V power rails | Not interchangeable; requires full redesign due to mismatched VWM and clamping profile |
Compared with SMAJ85A and TPSMD8.5A, the SMCJ85H uniquely delivers 1500W clamping capability at 85V stand-off in an AEC-Q101-qualified SMC package - making it the only drop-in solution for automotive power rail protection meeting ISO 7637-2 Pulse 5a requirements without layout or thermal redesign.
Availability
SMCJ85H is available at Aetrix Electronics and suitable for automotive power distribution, body control modules, engine control units, infotainment systems, and industrial 24V PLC I/O requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMCJ85H 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 and industrial markets.
The SMCJ series is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for robust, high-energy clamping in automotive 12V/24V electrical systems subject to ISO 7637-2 and ISO 16750-2 stress conditions.
FAQ
What is the clamping voltage of SMCJ85H at its rated peak pulse current?
The SMCJ85H has a maximum clamping voltage (VC) of 151 V at 10.4 A peak pulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a transient event and is guaranteed across the full operating temperature range of −55°C to +150°C.
Is SMCJ85H suitable for bidirectional transient protection?
No, SMCJ85H is a unidirectional TVS diode intended for DC power line protection with polarity-sensitive placement (cathode to protected line). For bidirectional applications such as AC lines or differential buses, the SMCJ85AH variant - which uses a symmetrical bipolar structure - must be used instead. The "H" suffix denotes unidirectional construction.
Does SMCJ85H meet automotive qualification standards?
Yes, SMCJ85H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its glass-passivated junction, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1 rating further validate its suitability for automotive under-hood and cabin applications.
What is the thermal resistance of SMCJ85H, and how does it affect PCB layout?
The SMCJ85H 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 during repetitive surges, PCB copper area under the SMC pad must provide adequate heat spreading - typically ≥ 100 mm² of 2 oz copper connected via ≥ four thermal vias to internal ground planes.
How does the leakage current of SMCJ85H impact battery-powered automotive modules?
The SMCJ85H exhibits ≤1 µA maximum reverse leakage current at its 85 V working stand-off voltage, measured at 25°C. This ultra-low leakage ensures negligible parasitic drain on 12V vehicle batteries during extended key-off periods - critical for telematics, alarm systems, and always-on ECUs where total sleep current must remain below 50 µA.
SMCJ85H 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 151V
- Current - Peak Pulse (10/1000µs):
- 10.4A
- 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)
SMCJ85H FAQ
1.How can I place an order for SMCJ85H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85H 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 SMCJ85H reliable?
The price and inventory of SMCJ85H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85H is usually 5 days.
3.What payment methods are accepted for SMCJ85H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85H?
SMCJ85H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85H 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 SMCJ85H?
For technical support, including SMCJ85H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85H requirements.
6.How does Aetrix verify that SMCJ85H is sourced from the original manufacturer or authorized distributors?
All SMCJ85H 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 SMCJ85H meets industry standards.
7.What is the process for return or replacement of SMCJ85H?
All SMCJ85H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85H, 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 SMCJ85H part is unused and in its original packaging.
Return procedure for SMCJ85H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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