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Taiwan Semiconductor Corporation SMCJ85AH
- Part No.:
- SMCJ85AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AH.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,400
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Product details
Overview
SMCJ85AH 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), 94.4–104V breakdown voltage (VBR), and 137V maximum clamping voltage (VC) at 11.5A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection in power rail interfaces.
For engineers reviewing the SMCJ85AH datasheet, SMCJ85AH pinout, SMCJ85AH application, or SMCJ85AH equivalent, this device is selected for high-energy transient suppression in 12V/24V automotive subsystems, industrial DC power inputs, and telecom line cards where low clamping ratio, sub-1ps response, and <1µA leakage above 10V are critical.
Technical Context
The SMCJ85AH uses a glass-passivated silicon junction optimized for fast avalanche response (<1.0ps rise time from 0V to VBR min) and stable clamping under repetitive 10/1000µs surge waveforms. Its unidirectional configuration enables asymmetric protection of positive-rail circuits without reverse conduction during normal operation.
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, supporting 5W steady-state dissipation at 25°C ambient. The device operates across –55°C to +150°C junction temperature and complies with J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for 12V/24V systems. |
| VBR @ IT=1mA | 94.4–104 V - Breakdown threshold range; ensures reliable turn-on before downstream IC damage at rated surge levels. |
| VC @ IPPM=11.5A | 137 V - Clamped voltage during 10/1000µs surge; limits stress on protected 100V-rated MOSFETs or controllers. |
| PPK | 1500 W - Peak pulse power rating per 1ms pulse; supports ISO 7637-2 Pulse 5a (load dump) energy absorption. |
| IR @ VWM | <1 µA - Reverse leakage at 85V; negligible power loss and signal integrity impact in always-on monitoring circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive modules without derating at 85°C ambient. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210g. UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode reference / clamping node | Connected to protected circuit's positive rail; conducts during overvoltage to shunt current to ground. |
| Anode | Ground reference / return path | Connected to system ground plane; completes low-inductance surge current loop for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per stress test plan. |
| Clamping ratio VC/VBR | 1.31 typical (137V/104V) - Low ratio ensures minimal overvoltage overshoot during transients. |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) waveforms. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal/humidity stress vs. epoxy-passivated alternatives. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting microcontroller I/O and CAN transceiver power rails against battery load dump and alternator ripple in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp on 12V supply input, activated within <1ps to limit voltage to ≤137V during 100V/100ms pulses. Use Value: Prevents latch-up or gate oxide failure in 100V-rated power management ICs while maintaining <1µA quiescent leakage. | Use Scenario: Safeguarding 24V DC input terminals of programmable logic controller digital input modules exposed to field-wiring surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on DIN-rail mounted I/O card, absorbing up to 1500W per IEC 61000-4-5 Combination Wave. Use Value: Enables CE-compliant immunity without external MOVs or gas discharge tubes, reducing BOM count and PCB footprint. |
| Telecom Base Station Power Supply | EV Onboard Charger (OBC) Auxiliary Rail |
Use Scenario: Shielding 48V intermediate bus converters from lightning-induced surges on outdoor telecom cabinet power feeds. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated DC-DC output, clamping ISO 7637-2 Pulse 5a events to protect downstream PMICs. Use Value: Delivers 137V clamping at 11.5A with 55°C/W thermal resistance, enabling compact heatsinkless layout in space-constrained enclosures. | Use Scenario: Securing 12V auxiliary supply feeding OBC control logic against high-energy transients from HV battery switching noise. IC Role / Device Role / Timing Role: Unidirectional rail protector between DC-DC converter output and MCU power domain, rated for 1500W peak pulse. Use Value: Meets AEC-Q101 requirements and supports 150°C junction operation, ensuring reliability in high-ambient under-hood environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A | 600W PPK rating, SMA package (smaller footprint, higher RθJA = 85°C/W), same VWM/VBR/VC specs. | Lower energy handling; suitable only for sub-600W surge threats like ESD or low-energy switching noise. | Select SMAJ85A when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4. |
| SMCJ85A | Same 1500W PPK and DO-214AB package, but non-AEC-Q101 qualified; slightly higher IR (≤5µA vs. ≤1µA). | Lacks automotive qualification; not approved for safety-critical vehicle subsystems requiring AEC-Q101 evidence. | Choose SMCJ85A for cost-sensitive industrial or consumer designs where AEC-Q101 is not mandated. |
Compared with SMAJ85A and SMCJ85A, the SMCJ85AH provides superior automotive qualification, lower leakage, and identical high-energy clamping performance-making it the preferred choice for AEC-Q101-compliant 12V/24V rail protection where reliability and low standby loss are prioritized.
Availability
SMCJ85AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power supplies, and EV onboard charger auxiliary rails requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ85AH 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, and power devices since 1979.
The SMCJ series is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial power rail protection with emphasis on low clamping ratio, fast response, and robust thermal performance.
FAQ
What is the clamping voltage of SMCJ85AH at its rated peak pulse current?
The SMCJ85AH has a maximum clamping voltage (VC) of 137 V at 11.5 A peak pulse current (IPPM), measured under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures protected downstream components see no more than 137 V during surge events. The SMCJ85AH maintains this clamping performance consistently due to its glass-passivated junction and optimized die design.
Is SMCJ85AH suitable for bidirectional transient suppression?
No, the SMCJ85AH is a unidirectional TVS diode and is not designed for bidirectional operation. For bidirectional protection, Taiwan Semiconductor offers the SMCJ85CAH variant, which features symmetrical breakdown in both polarities. Using SMCJ85AH in reverse-biased configurations may result in premature failure or undefined clamping behavior. Always verify polarity alignment during PCB layout for the SMCJ85AH.
Does SMCJ85AH meet automotive qualification standards?
Yes, the SMCJ85AH is AEC-Q101 qualified and tested per the full stress test schedule, including HTGB, HTRB, temperature cycling, and ESD. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical system immunity. These qualifications make the SMCJ85AH appropriate for use in engine control units, body control modules, and other automotive subsystems requiring certified reliability.
What is the maximum junction temperature rating for SMCJ85AH?
The SMCJ85AH has a maximum junction temperature (TJ max) rating of +150°C, with operational capability from –55°C to +150°C. This wide range supports deployment in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. Derating curves in the datasheet define allowable power dissipation above 25°C ambient, based on RθJA = 55°C/W.
How does the leakage current of SMCJ85AH compare to standard TVS diodes?
The SMCJ85AH exhibits exceptionally low reverse leakage: ≤1 µA at its 85 V working stand-off voltage (VWM), significantly lower than many competing 1500W TVS diodes that specify ≤5 µA or higher. This ultra-low leakage minimizes standby power loss in always-on automotive modules and preserves signal integrity in high-impedance sensing circuits. The SMCJ85AH achieves this via precise junction control and glass passivation.
SMCJ85AH 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:
- 137V
- Current - Peak Pulse (10/1000µs):
- 11.5A
- 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)
SMCJ85AH FAQ
1.How can I place an order for SMCJ85AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AH 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 SMCJ85AH reliable?
The price and inventory of SMCJ85AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85AH is usually 5 days.
3.What payment methods are accepted for SMCJ85AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AH?
SMCJ85AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AH 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 SMCJ85AH?
For technical support, including SMCJ85AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AH requirements.
6.How does Aetrix verify that SMCJ85AH is sourced from the original manufacturer or authorized distributors?
All SMCJ85AH 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 SMCJ85AH meets industry standards.
7.What is the process for return or replacement of SMCJ85AH?
All SMCJ85AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AH, 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 SMCJ85AH part is unused and in its original packaging.
Return procedure for SMCJ85AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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