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Vishay General Semiconductor - Diodes Division SMCJ85CA-M3/57T
- Part No.:
- SMCJ85CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CA-M3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,484
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Product details
Overview
SMCJ85CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 85 V standoff voltage (VWM), 137 V maximum clamping voltage (VC) at 10.9 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) under 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O modules.
For engineers reviewing the SMCJ85CA-M3/57T datasheet, SMCJ85CA-M3/57T pinout, SMCJ85CA-M3/57T application, or SMCJ85CA-M3/57T equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds its breakdown range (94.4–104 V at 1 mA test current), it avalanches to limit downstream voltage to ≤137 V. Its bidirectional structure enables symmetric suppression on AC-coupled or floating lines without polarity concerns.
Thermal design relies on low RθJL = 15 °C/W (junction-to-lead) and derating above 25 °C ambient per Figure 2; it sustains 200 A non-repetitive forward surge (IFSM) only in unidirectional variants - not applicable to SMCJ85CA-M3/57T due to bidirectional construction.
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 / 104 V at 1 mA - guaranteed avalanche onset window defining turn-on consistency |
| VC @ IPPM | 137 V at 10.9 A - clamped voltage seen by protected circuit during full-rated 1500 W transient |
| PPPM | 1500 W - peak surge energy handling capacity under standardized 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - leakage current level confirming minimal standby power loss and noise coupling |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for high-power density layout |
| MSL Level | Level 1 per J-STD-020 - supports lead-free reflow up to 260 °C peak without preconditioning |
Pinout & Package
SMCJ85CA-M3/57T uses the standard SMC (DO-214AB) package: two-terminal, symmetrical construction with no polarity marking (bidirectional). Terminals are matte tin-plated leads compliant with J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Either terminal serves as input/output; identical clamping behavior in both directions - eliminates orientation constraints during placement |
| Case (cathode band absent) | Non-functional mechanical reference | No electrical connection; absence of band confirms bidirectional configuration per Vishay marking convention |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled buses (e.g., RS-485, CAN FD) without external diode pairing or polarity awareness |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when mounted on 8 mm × 8 mm copper pads |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during fast transients - critical for safeguarding 100 V-rated MOSFET gates and microcontroller I/O |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 for restricted substances |
| UL 497B recognized (QVGQ2) | Validated for telecom and industrial surge protection systems requiring third-party safety certification |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and pressure sensor signal lines from load-dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor output and MCU ADC input to clamp ±100 V transients within 1 ns response time. Use Value: Prevents latch-up and gate oxide damage in 3.3 V/5 V signal chains while maintaining <1.0 μA leakage at 85 V operating rail. | Use Scenario: Shielding 4–20 mA current-loop inputs in programmable logic controllers from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Standoff device across loop terminals to shunt >1 kV transients before reaching precision op-amps and DACs. Use Value: Ensures uninterrupted analog measurement integrity during factory floor lightning strikes or relay switching noise. |
| Telecom Power Feeding | Consumer USB-C Port Protection |
Use Scenario: Safeguarding PoE-powered devices (e.g., IP cameras) against induced surges on 48 V DC power pairs during outdoor cable runs. IC Role / Device Role / Timing Role: Primary clamping element on PSE-side feed lines, coordinated with secondary TVS arrays for differential-mode suppression. Use Value: Maintains IEEE 802.3bt compliance by limiting voltage excursion to <137 V during 10/1000 μs surges up to 1500 W. | Use Scenario: Adding robustness to USB-C receptacles against hot-plug induced transients and accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Bidirectional clamp across VBUS and CC lines to prevent overvoltage damage to USB PD controllers and port switches. Use Value: Enables fail-safe operation under USB-IF compliance tests including 10/1000 μs surge and contact discharge ESD up to ±15 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85CA | Lower PPPM (600 W), same VWM/VC, smaller SMA package | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is ≤Level 2 |
| SMCJ85CA-E3/57T | Identical electrical specs; RoHS-compliant but not halogen-free (E3 vs M3) | No difference in protection performance; diverges only in material compliance reporting | Choose E3 for cost-sensitive commercial designs where halogen-free status is not mandated |
Compared with SAC85CA and SMCJ85CA-E3/57T, the SMCJ85CA-M3/57T delivers full 1500 W surge immunity in a halogen-free package - making it the preferred choice for automotive-tier 1 suppliers and industrial OEMs requiring both high-energy clamping and strict material declarations.
Availability
SMCJ85CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, telecom power feeding circuits, and consumer USB-C port protection requiring stable component supply and traceable sourcing.
Supply support for SMCJ85CA-M3/57T 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability and AEC-Q qualification.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal integrity.
FAQ
What is the clamping voltage of SMCJ85CA-M3/57T at its rated peak pulse current?
The SMCJ85CA-M3/57T has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current (IPPM) of 10.9 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88394, ensuring predictable voltage limiting during surge events. The SMCJ85CA-M3/57T maintains this clamping performance bidirectionally across both terminals.
Is SMCJ85CA-M3/57T qualified to AEC-Q101 for automotive use?
The SMCJ85CA-M3/57T itself is not AEC-Q101 qualified; qualification requires the HM3 suffix (e.g., SMCJ85CAHM3_A/H). However, the base SMCJ85CA-M3/57T shares identical die and construction with AEC-Q101 variants - differing only in test documentation and packaging labeling. For production automotive designs, engineers must specify the HM3-part number to receive certified test reports and lot traceability required by Tier 1 suppliers.
How does the bidirectional nature of SMCJ85CA-M3/57T affect PCB layout?
The bidirectional architecture of SMCJ85CA-M3/57T eliminates polarity constraints: no cathode band marking exists, and either terminal functions identically in both directions. This simplifies PCB layout by removing orientation checks during automated placement and enabling direct replacement of unidirectional parts without netlist changes - provided the application demands symmetrical clamping, such as on differential buses or floating sensors. The SMCJ85CA-M3/57T's DO-214AB footprint remains unchanged regardless of directionality.
What is the thermal resistance from junction to ambient for SMCJ85CA-M3/57T?
The typical thermal resistance from junction to ambient (RθJA) for SMCJ85CA-M3/57T is 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads). This value assumes still air conditions and defines the baseline for derating power dissipation above 25 °C ambient temperature, as shown in Figure 2 of Vishay's datasheet 88394. For higher reliability, designers should use the lower RθJL = 15 °C/W value when calculating lead-to-heatsink paths. The SMCJ85CA-M3/57T's thermal performance directly impacts its ability to survive repetitive surge events.
Can SMCJ85CA-M3/57T be used in place of a unidirectional TVS like SMCJ85A-M3/57T?
SMCJ85CA-M3/57T can replace SMCJ85A-M3/57T only in applications where bidirectional clamping is acceptable or required - such as AC-coupled lines, floating references, or differential signaling. It must not be substituted in DC-biased unidirectional paths (e.g., 12 V supply rail with grounded return) without verifying that reverse conduction during normal operation won't cause leakage or latch-up. The SMCJ85CA-M3/57T provides identical VWM, VC, and PPPM ratings but lacks polarity-dependent forward conduction capability inherent to unidirectional variants.
SMCJ85CA-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ85CA-M3/57T FAQ
1.How can I place an order for SMCJ85CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CA-M3/57T 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-M3/57T reliable?
The price and inventory of SMCJ85CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CA-M3/57T?
SMCJ85CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CA-M3/57T 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-M3/57T?
For technical support, including SMCJ85CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ85CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85CA-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85CA-M3/57T?
All SMCJ85CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CA-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ85CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CA-M3/57T Tags
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