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Taiwan Semiconductor Corporation SMCJ85CA
- Part No.:
- SMCJ85CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CA.pdf
- Description:
- TVS DIODE 85VWM 137VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,778
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Product details
Overview
SMCJ85CA from Taiwan Semiconductor is a bidirectional 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 - designed for automotive load-dump and ISO 7637-2 Pulse 1/2a/2b/3a/3b protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ85CA datasheet, SMCJ85CA pinout, SMCJ85CA application, or SMCJ85CA equivalent, this device delivers verified bidirectional clamping performance, sub-1ps response time, <1μA reverse leakage above 10V, and UL 94V-0 molded case - critical for ESD-hardened industrial control I/O, automotive body electronics, and 24V/48V DC bus surge immunity design.
Technical Context
The SMCJ85CA implements a glass-passivated silicon avalanche junction optimized for fast transient suppression without degradation under repetitive surges. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal paths, eliminating polarity concerns in differential bus protection.
Thermal design is supported by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = +150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - suitable for lead-free reflow without popcorn risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail (e.g., 24V/48V/72V DC buses) |
| VBR min/max | 94.4 V / 104 V @ IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients |
| VC @ IPPM | 137 V @ 11.5 A - Clamped voltage during 10/1000μs surge; defines worst-case overvoltage seen by protected IC |
| PPK | 1500 W - Peak pulse power rating per 1ms non-repetitive waveform; validates robustness against ISO 7637-2 Pulse 5a/b |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline; compatible with automated placement and IPC-7351B land patterns |
Pinout & Package
DO-214AB (SMC) package: molded epoxy case with matte tin-plated leads, cathode band marking for unidirectional variants; SMCJ85CA is bidirectional and marked with "GGV" code - no polarity marking required. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | Interchangeable terminals enable mounting without orientation check; clamps equally in both directions |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (switching noise) - essential for automotive ECUs |
| Clamping response time | <1.0 ps - Enables protection of high-speed interfaces (e.g., CAN FD, LIN) without signal distortion |
| Glass passivated junction | Enhances long-term reliability under thermal cycling and humidity exposure - critical for under-hood applications |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and export compliance |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceivers from load-dump spikes during battery disconnection in 12V/24V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS clamp on power rail and data lines - absorbs energy before it reaches sensitive logic. Use Value: Limits transient overvoltage to ≤137V during 11.5A pulses, preventing latch-up or gate oxide damage in 3.3V/5V interface ICs. |
Use Scenario: Shielding 24V digital input channels from inductive kickback caused by solenoid/relay switching in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end surge limiter placed before optocoupler input stage - reduces stress on isolation barrier. Use Value: Withstands ≥1000 surges at rated PPK without parameter shift, extending field service life beyond 10 years. |
| LED Streetlight Power Supply | Telecom Remote Terminal Unit (RTU) |
Use Scenario: Safeguarding primary-side controller ICs and MOSFET gates against lightning-induced surges on AC mains input and DC bus. IC Role / Device Role / Timing Role: Secondary-stage TVS after MOV - provides precise clamping where MOV tolerance is too wide. Use Value: 137V VC ensures downstream 150V-rated electrolytics remain within 91% of rated voltage during worst-case surge. |
Use Scenario: Protecting RS-485 transceivers and microcontroller UART pins from EFT bursts and induced surges on outdoor telecom cabinet wiring. IC Role / Device Role / Timing Role: Point-of-entry TVS on differential bus lines - shunts common-mode energy before common-mode choke saturation. Use Value: Sub-1ps response preserves signal integrity on 10 Mbps RS-485 links while meeting IEC 61000-4-4 Level 4 (4 kV) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA (Bourns) | Same VWM/VBR/VC specs but 600W PPK rating; SMB package (smaller footprint, higher RθJA) | Limited to lower-energy transients (e.g., ESD only); unsuitable for ISO 7637-2 Pulse 5a/b | Select when board space is constrained and surge energy is ≤600W |
| P6SMB85CA (Littelfuse) | Identical 1500W rating and DO-214AB package; VBR min = 94.4V, VC = 137V - matches SMCJ85CA within ±0.5V | Same automotive/industrial use cases; qualified to AEC-Q101 with full PPAP documentation | Preferred for automotive OEM programs requiring AEC-Q101 qualification and traceability |
Compared with SMBJ85CA, the SMCJ85CA delivers 2.5× higher surge energy handling for heavy-duty load-dump protection; versus P6SMB85CA, it offers identical clamping performance but lacks AEC-Q101 certification - making it ideal for cost-sensitive industrial designs where qualification overhead is unnecessary.
Availability
SMCJ85CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, LED driver power supplies, and telecom remote terminal units requiring stable component supply across multi-year production cycles.
Supply support for SMCJ85CA 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 MOSFETs since 1979.
The SMCJ series was engineered specifically for high-energy transient suppression in automotive and industrial environments - emphasizing rugged packaging, ISO 7637-2 compliance, and stable parametric performance across -55°C to +150°C.
FAQ
What is the clamping voltage of SMCJ85CA at its rated peak pulse current?
The SMCJ85CA has a maximum clamping voltage (VC) of 137 V at 11.5 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMCJ85CA unidirectional or bidirectional, and how is polarity indicated?
The SMCJ85CA is a bidirectional TVS diode - it clamps symmetrically in both forward and reverse directions, with identical VBR and VC characteristics. Unlike unidirectional variants (e.g., SMCJ85A), it carries no cathode band marking and uses "GGV" as its marking code on the DO-214AB package body.
Does SMCJ85CA meet automotive transient immunity standards?
Yes, the SMCJ85CA meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (switching noise). Its 1500W peak power rating and 137V clamping voltage ensure compliance with Level III and IV test profiles used in passenger car and commercial vehicle ECU validation.
What is the maximum steady-state power dissipation (PD) for SMCJ85CA?
The SMCJ85CA has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value applies only to continuous DC or low-frequency reverse-bias conditions - not transient events. Derating is required above 25°C per the published thermal curve (Fig.2), reaching ~2.5 W at 75°C ambient.
Can SMCJ85CA be used in place of SMCJ85A in a new design?
No - SMCJ85CA and SMCJ85A are functionally distinct: SMCJ85CA is bidirectional (clamps in both polarities), while SMCJ85A is unidirectional (clamps only in reverse bias). Substituting one for the other requires verifying circuit topology; using SMCJ85CA in a unidirectional application may cause unintended forward conduction during normal operation.
SMCJ85CA 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ85CA FAQ
1.How can I place an order for SMCJ85CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CA 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 SMCJ85CA reliable?
The price and inventory of SMCJ85CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CA is usually 5 days.
3.What payment methods are accepted for SMCJ85CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CA?
SMCJ85CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CA 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 SMCJ85CA?
For technical support, including SMCJ85CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CA requirements.
6.How does Aetrix verify that SMCJ85CA is sourced from the original manufacturer or authorized distributors?
All SMCJ85CA 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 SMCJ85CA meets industry standards.
7.What is the process for return or replacement of SMCJ85CA?
All SMCJ85CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CA, 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 SMCJ85CA part is unused and in its original packaging.
Return procedure for SMCJ85CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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