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Vishay General Semiconductor - Diodes Division SMCJ85CAHE3_A/I
- Part No.:
- SMCJ85CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAHE3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,658
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Product details
Overview
SMCJ85CAHE3_A/I 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 (PPPM) with 10/1000 μs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ85CAHE3_A/I datasheet, SMCJ85CAHE3_A/I pinout, SMCJ85CAHE3_A/I application, or SMCJ85CAHE3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), junction temperature range (–55 to +150 °C), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1.0 μA leakage at 85 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown range (94.4–104 V at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
The SMCJ85CAHE3_A/I is rated for unidirectional/bidirectional operation per ANSI/IEEE C62.35, with identical electrical specs in both directions. Its MSL Level 1 rating (260 °C peak reflow) and matte tin-plated leads comply with J-STD-002/JESD 22-B102 solderability standards - critical for high-reliability automotive PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V/24 V/48 V systems. |
| VBR min/max | 94.4 V / 104 V at 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 137 V at 10.9 A (10/1000 μs) - peak clamped voltage seen by protected circuit; determines minimum voltage tolerance of downstream ICs. |
| PPPM | 1500 W - surge energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance with proper layout. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| RθJA | 75 °C/W - thermal resistance from junction to ambient; requires ≥8.0 mm × 8.0 mm copper pad per terminal for full power rating. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no functional distinction in layout. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; device mounts with either orientation - simplifies PCB routing and placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware placement in AC-coupled or floating signal paths. |
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements - supports use in ADAS power modules and body control units without additional qualification. |
| Low incremental surge resistance | Enables tighter VC specification (137 V) at 10.9 A - reduces voltage overshoot during fast transients compared to higher-Rsurge TVS devices. |
| MSL Level 1 rating | Compatible with standard lead-free reflow profiles up to 260 °C peak - avoids moisture sensitivity handling and baking steps in manufacturing. |
| Glass passivated junction | Stable avalanche characteristics over lifetime and temperature - prevents parameter drift in harsh thermal cycling environments. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping surges before they reach LDOs and microcontrollers. Use Value: Withstands 1500 W pulses while limiting voltage to ≤137 V - preserves integrity of 16 V-rated input capacitors and 3.3 V/5 V logic supplies. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) in factory automation sensors exposed to ESD and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional clamp across differential or single-ended signal pairs, absorbing ±8 kV contact ESD (IEC 61000-4-2) and 100 V/μs fast transients. Use Value: Symmetrical clamping ensures equal protection for positive/negative transients - eliminates risk of reverse-bias damage in floating or AC-coupled interfaces. |
| Telecom DC Power Feeds | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Guarding PoE-powered equipment (e.g., IP cameras, access points) against induced surges on 48 V DC input lines from nearby lightning or grid switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converters, coordinated with secondary TVS or MOV stages for staged energy absorption. Use Value: 85 V VWM provides 10% margin above nominal 48 V, while 137 V VC aligns with 150 V-rated input capacitors - enabling compact, cost-effective front-end protection. |
Use Scenario: Hardening USB Type-C and barrel jack inputs in portable audio, smart home hubs, and medical monitors against user-induced ESD and accidental AC adapter misconnection. IC Role / Device Role / Timing Role: First-line defense at board edge, placed before EMI filters and input fuses to prevent latch-up or gate oxide rupture in PMICs. Use Value: Low leakage (<1.0 μA at 85 V) prevents standby current drain; RoHS-compliant matte tin terminations ensure reliable solder joints in high-mix consumer assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHE3_A/I | Lower PPPM (600 W), same VWM/VC, SMB (DO-214AA) package - 30% smaller footprint, 40% lower surge capacity. | Better suited for space-constrained consumer ports where 600 W surge coverage suffices; not recommended for automotive load dump. | Select SMBJ85CAHE3_A/I only if board area is critical and surge threat level is limited to IEC 61000-4-2/4-4. |
| SMCJ85CAHM3_A/I | Identical electrical specs and AEC-Q101 qualification, but halogen-free molding compound and terminations. | Required for RoHS-compliant, halogen-free BOMs in EU automotive programs (e.g., VW TL 81300); no performance trade-off. | Choose SMCJ85CAHM3_A/I when halogen-free compliance is mandated - otherwise SMCJ85CAHE3_A/I offers identical protection at standard cost. |
Compared with SMBJ85CAHE3_A/I, the SMCJ85CAHE3_A/I delivers 2.5× higher surge power handling in the same mounting style; versus SMCJ85CAHM3_A/I, it shares all protection parameters but uses standard RoHS-compliant (non-halogen-free) materials - making it optimal for cost-sensitive AEC-Q101 applications without halogen restrictions.
Availability
SMCJ85CAHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power feeds requiring stable component supply with AEC-Q101 validation and long-term lifecycle support.
Supply support for SMCJ85CAHE3_A/I 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific performance.
The SMCJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure - engineered for repeatable clamping, low leakage, and robust thermal performance in demanding environments.
FAQ
What is the clamping voltage of the SMCJ85CAHE3_A/I under a 10/1000 μs surge?
The SMCJ85CAHE3_A/I clamps to a maximum of 137 V when subjected to its rated peak pulse current of 10.9 A with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on protected circuitry during standardized surge events - a critical parameter for ensuring downstream IC survival in ISO 7637-2 or IEC 61000-4-5 compliant designs. The SMCJ85CAHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SMCJ85CAHE3_A/I suitable for automotive applications?
Yes, the SMCJ85CAHE3_A/I is AEC-Q101 qualified and explicitly intended for automotive use, including engine control modules, body electronics, and ADAS subsystems. Its qualification covers high-temperature operating life (HTOL), temperature cycling (TC), and unbiased highly accelerated stress test (UHAST), confirming reliability under under-hood thermal and vibration conditions. The SMCJ85CAHE3_A/I also meets MSL Level 1 for lead-free reflow, supporting modern automotive PCB assembly processes without moisture sensitivity concerns.
How does the bidirectional design of the SMCJ85CAHE3_A/I affect PCB layout?
The SMCJ85CAHE3_A/I has no polarity marking and identical electrical behavior in both directions, allowing unrestricted orientation during automated placement - reducing placement errors and eliminating the need for silkscreen polarity indicators or orientation-specific footprints. This symmetry simplifies layout for AC-coupled lines, differential buses (e.g., CAN), or floating power domains where transient polarity is unpredictable. The SMCJ85CAHE3_A/I's DO-214AB package requires symmetric 8.0 mm × 8.0 mm copper pads on both terminals to achieve full 1500 W rating, per Vishay's thermal guidelines.
What is the maximum junction temperature rating for the SMCJ85CAHE3_A/I?
The SMCJ85CAHE3_A/I has a maximum junction temperature (TJ max) of +150 °C, enabling operation in high-ambient environments such as automotive engine compartments or industrial motor drives. This rating is supported by its thermal resistance of 75 °C/W (junction-to-ambient) when mounted on the recommended 8.0 mm × 8.0 mm copper pads. Derating curves in the datasheet show usable power capability down to 50% at 125 °C ambient - ensuring the SMCJ85CAHE3_A/I remains effective even in thermally stressed layouts.
Does the SMCJ85CAHE3_A/I meet RoHS and REACH requirements?
Yes, the SMCJ85CAHE3_A/I is RoHS-compliant (per Directive 2011/65/EU) and REACH-conformant, with lead content below 1000 ppm and no SVHC substances above threshold. Its "HE3" suffix denotes RoHS-compliant construction using matte tin-plated leads and UL 94 V-0 molding compound. The SMCJ85CAHE3_A/I also satisfies JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards - confirming suitability for high-reliability, environmentally regulated production programs.
SMCJ85CAHE3_A/I 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ85CAHE3_A/I FAQ
1.How can I place an order for SMCJ85CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAHE3_A/I 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 SMCJ85CAHE3_A/I reliable?
The price and inventory of SMCJ85CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ85CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAHE3_A/I?
SMCJ85CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAHE3_A/I 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 SMCJ85CAHE3_A/I?
For technical support, including SMCJ85CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAHE3_A/I requirements.
6.How does Aetrix verify that SMCJ85CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAHE3_A/I 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 SMCJ85CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ85CAHE3_A/I?
All SMCJ85CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAHE3_A/I, 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 SMCJ85CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ85CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CAHE3_A/I Tags
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