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Vishay General Semiconductor - Diodes Division SMCJ85A-M3/57T
- Part No.:
- SMCJ85A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85A-M3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,674
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Product details
Overview
SMCJ85A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount 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 stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), clamping voltage of 137 V at 10.9 A, and operates from –55 °C to +150 °C junction temperature - deployed in automotive power supply inputs and industrial sensor interface circuits.
For engineers reviewing the SMCJ85A-M3/57T datasheet, SMCJ85A-M3/57T pinout, SMCJ85A-M3/57T application, or SMCJ85A-M3/57T equivalent, key selection criteria include verified clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ85A-M3/57T uses a glass-passivated silicon junction optimized for fast response (<1 ns) to transient events such as ESD, inductive switching spikes, and lightning-induced surges. Its unidirectional polarity (cathode-banded) enables asymmetric clamping on positive-going transients while blocking reverse leakage ≤1.0 µA at 85 V.
It meets MSL level 1 per J-STD-020 (peak reflow ≤260 °C), supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and delivers stable clamping up to TJ = 150 °C with a VBR temperature coefficient of 0.106 %/°C - critical for under-hood automotive environments where thermal derating must be modeled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin for 12 V/24 V/48 V systems. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - ensures reliable turn-on above normal operating voltage with controlled tolerance band. |
| VC @ IPPM | 137 V at 10.9 A - clamping voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm pads; enables thermal derating calculations for sustained surge duty cycles. |
| TJ max. | +150 °C - maximum junction temperature rating; supports AEC-Q101-qualified operation in engine compartment applications. |
| Leakage ID | ≤1.0 µA at 85 V - low reverse leakage preserves battery life and avoids false triggering in always-on circuits. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during positive transients when cathode is at higher potential. |
| Cathode (banded end) | Clamping control terminal | Connected to protected line (e.g., 85 V rail); initiates avalanche breakdown when voltage exceeds VBR, shunting surge current to anode. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against high-energy transients per IEC 61000-4-5 without external series impedance. |
| Fast response time <1 ns | Prevents voltage overshoot beyond clamping threshold during nanosecond-scale ESD or switching events. |
| Glass passivated junction | Ensures long-term reliability and stable VBR under humidity, thermal cycling, and mechanical stress per AEC-Q101. |
| Halogen-free, RoHS-compliant (M3) | Meets automotive and industrial environmental compliance requirements without compromising surge performance. |
| MSL level 1 reflow compatibility | Supports standard lead-free reflow profiles (peak 260 °C) without degradation or delamination risk. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power input of body control modules (BCM) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive surges above 85 V. Use Value: Limits peak voltage to 137 V during 10/1000 µs 10.9 A surge, preventing damage to upstream DC-DC converters and microcontrollers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted across signal and return paths to absorb induced EFT/burst noise from nearby motor drives. Use Value: Low 1.0 µA leakage at 85 V avoids loading the precision current source; 137 V clamping prevents op-amp saturation or ADC overrange. |
| Telecom DC Power Feeds | Consumer Appliance Motor Driver Protection |
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) against surge coupling from Ethernet cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on DC input stage, referenced to local ground, absorbing common-mode surges coupled onto power pair. Use Value: 1500 W PPPM handles combined surges from both data and power lines; 75 °C/W RθJA allows thermal design margin under sealed enclosure conditions. | Use Scenario: Protecting gate drivers and logic inputs of BLDC motor controllers in HVAC systems from back-EMF spikes. IC Role / Device Role / Timing Role: TVS placed across driver supply pins (e.g., VDD to GND) to clamp inductive kickback from MOSFET switching. Use Value: 94.4–104 V VBR aligns with 100 V-rated gate drivers; 137 V VC ensures driver ICs remain within absolute maximum ratings during worst-case commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-M3/57T | Lower PPPM (600 W), same VWM/VBR range, SMB (DO-214AA) package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained, lower-energy surge environments (e.g., USB power ports); not rated for IEC 61000-4-5 Level 4. | Select when board area is limited and surge energy does not exceed 600 W; verify thermal margin due to higher RθJA. |
| SMCJ85CA-M3/57T | Bidirectional variant; identical VWM/VBR/PPPM but symmetrical clamping in both polarities; no polarity marking | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus); unsuitable for DC rail protection where unidirectional blocking is needed. | Choose only when protecting bidirectional signals; avoid for DC power rails due to unnecessary reverse conduction path. |
Compared with SMBJ85A-M3/57T and SMCJ85CA-M3/57T, the SMCJ85A-M3/57T provides optimal balance of high-energy surge handling (1500 W), thermal performance (RθJA = 75 °C/W), and unidirectional DC rail compatibility - making it the preferred choice for automotive and industrial power input protection where both energy and thermal constraints are critical.
Availability
SMCJ85A-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution units, industrial sensor interfaces, telecom DC feeds, and consumer appliance motor control systems requiring stable component supply and halogen-free compliance.
Supply support for SMCJ85A-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, efficiency, and automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against load dump, EFT, and lightning surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ85A-M3/57T under a 10/1000 µs surge?
The SMCJ85A-M3/57T has a maximum clamping voltage (VC) of 137 V at 10.9 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ85A-M3/57T maintains this clamping performance across its specified operating temperature range, enabling predictable system-level protection design.
Is the SMCJ85A-M3/57T suitable for automotive applications?
Yes, the SMCJ85A-M3/57T is halogen-free, RoHS-compliant (M3 suffix), and qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes. While the base SMCJ85A-M3/57T is commercial-grade, its 1500 W PPPM, 150 °C TJ max., and MSL level 1 reflow compatibility make it widely adopted in automotive subsystems such as body electronics and infotainment power supplies. For full AEC-Q101 compliance, specify SMCJ85A-HM3/57T.
How does the SMCJ85A-M3/57T differ from the bidirectional SMCJ85CA-M3/57T?
The SMCJ85A-M3/57T is unidirectional with a cathode band and blocks reverse current below VBR, whereas the SMCJ85CA-M3/57T is bidirectional with symmetrical clamping in both directions and no polarity marking. Both share identical VWM (85 V), VBR (94.4–104 V), PPPM (1500 W), and package. The SMCJ85A-M3/57T is used on DC rails; the CA version is required for AC or differential signal lines like CAN or RS-485.
What is the thermal resistance of the SMCJ85A-M3/57T, and how does it affect layout?
The SMCJ85A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet. To maintain reliability under repeated surges, PCB layout must allocate sufficient copper area and consider thermal vias - undersized pads increase RθJA and risk thermal runaway during high-duty-cycle transients. The SMCJ85A-M3/57T benefits from symmetric thermal design on both terminals.
Does the SMCJ85A-M3/57T meet industry surge immunity standards?
Yes, the SMCJ85A-M3/57T's 1500 W peak pulse power (10/1000 µs) and 137 V clamping voltage enable compliance with IEC 61000-4-5 Level 4 (4 kV, 2 Ω source impedance) when properly integrated into a system-level protection scheme. Its fast response (<1 ns), low leakage (≤1.0 µA), and stable VBR over temperature support robust immunity in automotive (ISO 7637-2) and industrial (IEC 61000-4-4/5) applications. System validation remains the designer's responsibility.
SMCJ85A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ85A-M3/57T FAQ
1.How can I place an order for SMCJ85A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85A-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 SMCJ85A-M3/57T reliable?
The price and inventory of SMCJ85A-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 SMCJ85A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85A-M3/57T?
SMCJ85A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85A-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 SMCJ85A-M3/57T?
For technical support, including SMCJ85A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85A-M3/57T requirements.
6.How does Aetrix verify that SMCJ85A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85A-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 SMCJ85A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85A-M3/57T?
All SMCJ85A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85A-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 SMCJ85A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ85A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85A-M3/57T Tags
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