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Vishay General Semiconductor - Diodes Division SMCJ85CAHM3_A/H
- Part No.:
- SMCJ85CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAHM3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,674
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Product details
Overview
SMCJ85CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for clamping voltage transients up to 137 V at 10.9 A peak pulse current (10/1000 µs), with 1500 W peak pulse power rating and 85 V stand-off voltage. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching surges and lightning-induced transients.
For engineers reviewing the SMCJ85CAHM3_A/H datasheet, SMCJ85CAHM3_A/H pinout, SMCJ85CAHM3_A/H application, or SMCJ85CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, 1500 W surge rating, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This device operates as a silicon avalanche diode with symmetrical breakdown behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR (94.4–104 V) and low incremental surge resistance, critical for consistent clamping under repetitive transient stress.
The SMCJ85CAHM3_A/H is rated for TJ = –55 °C to +150 °C, features MSL Level 1 moisture sensitivity, and meets JESD201 Class 2 whisker resistance. Its thermal resistance (RθJA = 75 °C/W, RθJL = 15 °C/W) supports reliable operation on minimal 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 85 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 94.4–104 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| Clamping Voltage (VC) | 137 V at 10.9 A (10/1000 µs) - Actual voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| Peak Pulse Power (PPPM) | 1500 W - Sustained energy absorption capacity for standardized 10/1000 µs waveform; enables robust lightning/inductive spike handling. |
| Leakage Current (ID) | ≤1.0 µA at 85 V - Negligible standby power loss and signal integrity impact in high-impedance circuits. |
| Operating Temperature | –55 °C to +150 °C - Validated performance across automotive under-hood and industrial ambient extremes. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with JEDEC-compliant reflow profiles. |
Pinout & Package
SMCJ85CAHM3_A/H uses the SMC (DO-214AB) package: a two-terminal, bidirectional device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD22-B102, and meet JESD201 Class 2 whisker resistance. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; symmetric conduction enables AC path protection without orientation constraints. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; no functional distinction - device functions identically regardless of PCB layout orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and infotainment modules. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC JS709E requirements - eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), reducing risk of downstream component damage in high-speed data lines. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - eliminates bake requirements prior to reflow, streamlining high-volume SMT manufacturing. |
| Glass passivated junction | Ensures long-term parameter stability and reduced parameter drift over temperature and lifetime versus epoxy-passivated alternatives. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and jump-start transients in 12 V/24 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential signal pair or supply rail to shunt surge energy before it reaches front-end amplifiers or communication ICs. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 5a (load dump) events up to 60 V, with clamping voltage <137 V ensuring downstream ICs remain within absolute maximum ratings. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against inductive kickback from solenoids, relays, and motor drives in factory automation environments. IC Role / Device Role / Timing Role: Parallel-connected TVS on each I/O line to clamp transients exceeding 30 V, preventing latch-up or gate oxide damage in microcontroller GPIOs and optocoupler drivers. Use Value: Withstands repeated 1500 W surges per IEC 61000-4-5 Level 4 (4 kV line-to-earth), extending field-replaceable module service life in harsh electromagnetic environments. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY interfaces and DSL line drivers from lightning-induced surges entering via unshielded twisted-pair cabling in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary surge suppression stage before secondary filtering and common-mode chokes, absorbing >90% of 10/1000 µs surge energy. Use Value: Clamps induced common-mode voltages to <137 V within <1 ns, preventing saturation of magnetics and preserving signal timing margins in 10/100/1000BASE-T links. |
Use Scenario: Adding secondary-level transient immunity to USB-C and barrel-jack power inputs of smart home hubs and audio devices exposed to user-handling ESD and accidental AC mains contact. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between input rectifier output and primary DC-DC converter input to suppress 8 kV contact ESD (IEC 61000-4-2) and 1 kV ring wave surges. Use Value: Leverages 1.0 µA max leakage at 85 V to avoid quiescent current penalty in battery-backed designs while providing fail-safe shutdown during sustained overvoltage. |
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/H | Lower PPPM (400 W), same VWM/VC, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy transients (e.g., ESD-only); unsuitable for lightning or load-dump where 1500 W rating is required. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ85CA-E3/57T | Same electrical specs and SMC package, but RoHS-compliant commercial grade (non-halogen-free, no AEC-Q101 qualification) | Not approved for automotive use; lacks extended reliability validation for temperature cycling and HTRB stress. | Select for cost-sensitive industrial or consumer applications where AEC-Q101 and halogen-free compliance are not mandated. |
Compared with SMCJ85CAHM3_A/H, SMAJ85CAHE3_A/H offers smaller size but insufficient surge capacity for automotive or telecom surge standards, while SMCJ85CA-E3/57T matches performance but omits halogen-free construction and automotive qualification - making SMCJ85CAHM3_A/H the sole choice for AEC-Q101-compliant, environmentally regulated designs requiring full 1500 W capability.
Availability
SMCJ85CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom infrastructure, and consumer power adapter designs requiring stable component supply with guaranteed halogen-free and AEC-Q101-compliant sourcing.
Supply support for SMCJ85CAHM3_A/H 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, TVS, MOSFETs, and optoelectronics with emphasis on high-reliability, high-efficiency, and application-specific performance.
The SMCJ series was engineered for high-power transient suppression in demanding environments, targeting automotive, industrial, and telecom applications where robustness, consistency, and regulatory compliance are non-negotiable design requirements.
FAQ
What is the clamping voltage of SMCJ85CAHM3_A/H at its rated peak pulse current?
The SMCJ85CAHM3_A/H has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current 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 datasheet revision 09-Jan-2024, Document Number 88394. The clamping voltage directly determines the maximum stress imposed on protected circuitry during surge events, making it a critical parameter for system-level overvoltage margin analysis in the SMCJ85CAHM3_A/H design.
Is SMCJ85CAHM3_A/H suitable for automotive applications?
Yes, SMCJ85CAHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix HM3_X (where "X" denotes revision A/H). It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per AEC-Q101 Rev G. The SMCJ85CAHM3_A/H is deployed in engine control units, body electronics, and ADAS sensors where immunity to load-dump and jump-start transients is mandatory - confirming its suitability for under-hood and cabin automotive applications.
How does the halogen-free status of SMCJ85CAHM3_A/H affect its compliance and performance?
The "HM3" suffix in SMCJ85CAHM3_A/H indicates halogen-free, RoHS-compliant construction per JEDEC JS709E and IEC 61249-2-21, eliminating brominated and chlorinated flame retardants while retaining UL 94 V-0 flammability rating. This has no impact on electrical performance - VWM, VBR, VC, and PPPM match non-halogen variants - but satisfies strict environmental regulations (e.g., EU ELV, China RoHS) and improves end-of-life recyclability. The SMCJ85CAHM3_A/H maintains identical thermal and surge characteristics as its M3 counterparts.
What is the thermal resistance profile of SMCJ85CAHM3_A/H, and how does it influence PCB layout?
The SMCJ85CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This means PCB layout must allocate sufficient copper area to dissipate 6.5 W continuous power and manage transient thermal spikes. Reducing pad size increases RθJA, risking junction overheating during repeated surges - so adherence to the recommended pad layout is essential for achieving the full 1500 W PPPM rating in the SMCJ85CAHM3_A/H.
Does SMCJ85CAHM3_A/H have polarity markings, and how is it installed on PCB?
No, SMCJ85CAHM3_A/H is a bidirectional TVS and carries no polarity marking - unlike unidirectional variants that feature a cathode band. Its symmetrical structure allows installation in either orientation on the PCB without affecting function. This simplifies automated placement and eliminates orientation-related assembly errors. The SMCJ85CAHM3_A/H terminals are electrically interchangeable, making it ideal for protecting AC-coupled lines, differential pairs, or floating reference nodes where polarity reversal may occur.
SMCJ85CAHM3_A/H 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:
- 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_A/H FAQ
1.How can I place an order for SMCJ85CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAHM3_A/H 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_A/H reliable?
The price and inventory of SMCJ85CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ85CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAHM3_A/H?
SMCJ85CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAHM3_A/H 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_A/H?
For technical support, including SMCJ85CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ85CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ85CAHM3_A/H?
All SMCJ85CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMCJ85CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CAHM3_A/H Tags
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