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Vishay General Semiconductor - Diodes Division SMCJ85CAHM3/I
- Part No.:
- SMCJ85CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAHM3/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,493
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Product details
Overview
SMCJ85CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 85 V stand-off voltage (VWM), and 137 V maximum clamping voltage (VC) at 10.9 A IPPM under 10/1000 μs waveform. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ85CAHM3/I datasheet, SMCJ85CAHM3/I pinout, SMCJ85CAHM3/I application, or SMCJ85CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for board-level ESD and lightning surge immunity design.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown characteristics in both directions (VBR min/max = 94.4 V / 104 V at IT = 1 mA), enabling robust suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable leakage performance (ID ≤ 1.0 μA at VWM) and fast response time (< 1 ns).
Designed for surface-mount automated assembly, the SMCJ85CAHM3/I meets JESD201 Class 2 whisker resistance and MSL Level 1 (260 °C reflow peak), with matte tin-plated leads compliant to J-STD-002 and JESD22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed bidirectional breakdown threshold; ensures symmetric transient suppression on both polarities. |
| VC @ IPPM | 137 V at 10.9 A - Clamped voltage during 10/1000 μs surge; determines worst-case overvoltage seen by downstream components. |
| PPPM | 1500 W - Peak pulse power handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge testing with margin. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient; informs minimum copper pad area (8.0 mm × 8.0 mm recommended) for thermal reliability. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 2.06 mm height and 7.75 mm length; compatible with automated pick-and-place and reflow. |
Pinout & Package
SMCJ85CAHM3/I uses a 2-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional TVS construction. Terminals are matte tin-plated leads suitable for standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts reverse surge current during negative transients; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry point (positive polarity) | Accepts forward surge current during positive transients; completes bidirectional conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC specification. |
| Halogen-free & RoHS-compliant | Meets EU RoHS Directive 2011/65/EU and JEDEC JS709C; eliminates brominated flame retardants and antimony trioxide. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio ≈ 1.45) and higher energy absorption efficiency than standard Zener-based protectors. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics and reduces cost of ownership. |
| Glass passivated junction | Provides stable leakage current (≤1.0 μA) across -55 °C to +150 °C and long-term parameter stability under repeated surge events. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V/24 V power rails feeding ECUs, body control modules, and lighting drivers against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping transient suppressor placed at power input stage to limit surge-induced overvoltage before DC/DC converters and microcontrollers. Use Value: Withstands 1500 W surges and clamps to 137 V, preventing latch-up or permanent damage to downstream 3.3 V/5 V logic and gate drivers. | Use Scenario: Shielding analog and digital sensor outputs (e.g., pressure, temperature, position sensors) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional shunt protector located adjacent to connector interface to divert fast transients before reaching ADC inputs or communication ICs. Use Value: Symmetric clamping ensures equal protection for both signal polarities; low leakage (≤1.0 μA) avoids DC offset errors in precision analog front-ends. |
| Telecom Power Feeds | Consumer Device USB/Type-C Ports |
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras, wireless access points) from induced surges on Ethernet cables per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary surge clamp on DC input rail upstream of PoE interface ICs and isolation transformers. Use Value: 1500 W rating accommodates 4 kV surge tests; 85 V VWM aligns with common 48 V nominal telecom supply rails while maintaining safety margin. | Use Scenario: Secondary-level protection for USB Type-C power delivery circuits exposed to human-body-model (HBM) ESD and hot-plug transients. IC Role / Device Role / Timing Role: Board-level TVS placed between VBUS line and ground to clamp fast-rising ESD events before reaching PD controller and buck converter. Use Value: Sub-1 ns response time limits voltage overshoot; halogen-free construction satisfies consumer product environmental compliance 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 |
|---|---|---|---|
| SMAJ85CAHE3/A | Same VWM (85 V), lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy transients; not rated for IEC 61000-4-5 Level 4 | Select when space-constrained layouts prioritize size over surge robustness. |
| SMCJ85CA-E3/57T | Identical electrical specs and SMC package; differs only in packaging (7" tape/reel, commercial-grade, non-AEC-Q101, non-halogen-free) | Lacks automotive qualification and halogen-free certification; limited to commercial/industrial use | Choose for cost-sensitive non-automotive designs where AEC-Q101 and halogen-free status are not required. |
Compared with SMAJ85CAHE3/A and SMCJ85CA-E3/57T, the SMCJ85CAHM3/I delivers full 1500 W surge capability in an AEC-Q101-qualified, halogen-free platform-making it the only option among the three validated for under-hood automotive deployment with IEC 61000-4-5 compliance.
Availability
SMCJ85CAHM3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom PoE feeds, and consumer USB Type-C port protection requiring stable component supply across production lifecycles.
Supply support for SMCJ85CAHM3/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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where sustained surge immunity and long-term parametric stability are critical.
FAQ
What does the "HM3" suffix indicate in SMCJ85CAHM3/I?
The "HM3" suffix in SMCJ85CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "I" indicates 13-inch tape-and-reel packaging (3500 units per reel), while "HM3" confirms compliance with JEDEC JS709C and automotive reliability standards-not merely commercial-grade equivalence.
Is SMCJ85CAHM3/I suitable for protecting 48 V telecom power supplies?
Yes, SMCJ85CAHM3/I is appropriate for 48 V telecom power feed protection. Its 85 V stand-off voltage (VWM) provides adequate margin above 48 V nominal, and its 137 V clamping voltage (VC) ensures downstream 60 V-rated components remain within safe operating limits during IEC 61000-4-5 surges. The device's 1500 W rating supports Level 4 compliance.
How does SMCJ85CAHM3/I differ from unidirectional SMCJ85A variants?
SMCJ85CAHM3/I is bidirectional with symmetrical breakdown (VBR = 94.4–104 V in both directions) and no polarity marking, whereas unidirectional SMCJ85A has a cathode band and conducts only in reverse bias. This makes SMCJ85CAHM3/I ideal for AC-coupled or polarity-agnostic signal lines, while SMCJ85A suits DC rails where directionality is fixed and forward conduction must be blocked.
What is the maximum allowable PCB copper pad size for optimal thermal performance of SMCJ85CAHM3/I?
The datasheet specifies thermal characterization using 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for RθJA = 75 °C/W. Larger pads improve heat dissipation but do not change the rated PPPM; however, reducing pad area increases RθJA and risks thermal runaway during repetitive surges. No upper limit is defined, but standard layout practices apply.
Does SMCJ85CAHM3/I require derating at elevated ambient temperatures?
Yes, SMCJ85CAHM3/I requires derating above TA = 25 °C. Figure 2 in the Vishay datasheet shows linear derating of peak pulse power: at 85 °C ambient, PPPM drops to ~70 % of 1500 W (~1050 W); at 125 °C, it falls to ~40 % (~600 W). Designers must apply this curve when sizing for high-temperature enclosures or under-hood automotive locations.
SMCJ85CAHM3/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:
- Discontinued at Digi-Key
- 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:
- 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)
SMCJ85CAHM3/I FAQ
1.How can I place an order for SMCJ85CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAHM3/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 SMCJ85CAHM3/I reliable?
The price and inventory of SMCJ85CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ85CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAHM3/I?
SMCJ85CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAHM3/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 SMCJ85CAHM3/I?
For technical support, including SMCJ85CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAHM3/I requirements.
6.How does Aetrix verify that SMCJ85CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAHM3/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 SMCJ85CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ85CAHM3/I?
All SMCJ85CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAHM3/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 SMCJ85CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ85CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CAHM3/I Tags
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