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Vishay General Semiconductor - Diodes Division SMCJ85CAHM3_A/I
- Part No.:
- SMCJ85CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAHM3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
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Product details
Overview
SMCJ85CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount 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 standoff voltage (VWM), and 137 V maximum clamping voltage (VC) at 10.9 A peak pulse current (IPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ85CAHM3_A/I datasheet, SMCJ85CAHM3_A/I pinout, SMCJ85CAHM3_A/I application, or SMCJ85CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with 10/1000 µs surge waveforms in harsh ESD/lightning-prone environments.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding 85 V, it avalanches symmetrically in both directions to clamp voltage at ≤137 V while diverting up to 1500 W of surge energy. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed for surface-mount assembly on 8.0 mm × 8.0 mm copper pads per terminal, it meets MSL Level 1 (260 °C reflow) and supports automotive-grade reliability via AEC-Q101 qualification - critical for engine control units, ADAS sensors, and infotainment power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 94.4 V / 104 V - verified breakdown range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 137 V - clamping voltage at 10.9 A peak pulse current (10/1000 µs), limiting stress on downstream circuitry |
| PPPM | 1500 W - peak pulse power handling capacity under standardized transient waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage at rated standoff voltage, minimizing standby power loss |
| TJ max. | +150 °C - extended junction temperature rating enabling use in under-hood automotive environments |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ85CAHM3_A/I uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount case with matte tin-plated leads solderable per J-STD-002. Bidirectional construction means no cathode/anode marking; terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Common connection point for symmetrical clamping - connects to protected line (e.g., CAN_H or LIN bus) |
| Terminal 2 | Anode/Cathode (bidirectional) | Common return path - connects to ground or reference rail; no polarity sensitivity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN FD) without polarity concerns |
| AEC-Q101 qualified | Validated for automotive applications including powertrain and body electronics with zero defects over accelerated lifetime testing |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-20 requirements for green manufacturing and end-of-life processing |
| Low thermal resistance | RθJL = 15 °C/W enables efficient heat transfer to PCB copper, sustaining repeated surges without derating |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak, eliminating moisture sensitivity handling constraints |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied ECUs against load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS device clamping voltage spikes before they reach microcontroller power inputs or gate drivers. Use Value: Limits transient voltage to ≤137 V, preventing latch-up or permanent damage to 3.3 V/5 V logic and MOSFET gate oxides. | Use Scenario: Safeguarding analog output lines of pressure/temperature sensors exposed to ESD events in factory automation systems. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector entry point to absorb ±8 kV contact ESD (IEC 61000-4-2). Use Value: Sub-1 ns response time and 1.0 µA leakage preserve signal integrity and measurement accuracy in 4–20 mA loops. |
| Telecom Data Line Surge Suppression | Consumer Device USB Port Protection |
Use Scenario: Shielding RS-485 transceivers in building management networks from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pair (A/B lines), referenced to local ground. Use Value: Symmetrical 94.4–104 V breakdown ensures balanced clamping, maintaining common-mode rejection ratio during transients. | Use Scenario: Adding secondary-level surge immunity to USB 2.0 VBUS and D+/D− lines in smart home hubs subjected to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) placed upstream of USB controller ESD diodes. Use Value: 1500 W peak power rating absorbs multiple 15 kV air-discharge events without degradation, extending product field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CAHE3_A/I | Lower PPPM (400 W), same VWM (85 V), SMA package (smaller footprint, lower thermal mass) | Suitable for space-constrained consumer ports but insufficient for automotive load dump | Select when board area is critical and surge energy is limited to <400 W |
| SMCJ85CA-E3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and RoHS-compliant without halogen-free certification | Acceptable for industrial controls where automotive qualification is not mandated | Choose for cost-sensitive non-automotive designs requiring identical clamping performance |
Compared with SMCJ85CAHM3_A/I, SMAJ85CAHE3_A/I offers reduced surge robustness in a smaller package, while SMCJ85CA-E3/57T delivers identical protection without AEC-Q101 validation or halogen-free assurance - making the HM3_A/I variant optimal for mission-critical automotive deployments.
Availability
SMCJ85CAHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial sensor interface boards, and telecom data line protection circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ85CAHM3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in demanding environments; its design prioritizes automotive-grade ruggedness, precise clamping, and seamless integration into automated SMT production lines.
FAQ
What is the clamping voltage of SMCJ85CAHM3_A/I at its rated peak pulse current?
The SMCJ85CAHM3_A/I 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 ensures downstream components see voltage limited to this level during surge events - a critical parameter for protecting 12 V automotive electronics and industrial controllers. The SMCJ85CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMCJ85CAHM3_A/I suitable for automotive applications?
Yes, SMCJ85CAHM3_A/I is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its halogen-free, RoHS-compliant construction (HM3 suffix), MSL Level 1 rating, and guaranteed operation from –55 °C to +150 °C meet stringent automotive reliability requirements. The SMCJ85CAHM3_A/I also supports ISO 7637-2 Pulse 5a load dump protection when mounted on appropriate copper pad areas.
How does the bidirectional configuration of SMCJ85CAHM3_A/I affect its circuit placement?
The bidirectional configuration of SMCJ85CAHM3_A/I eliminates polarity concerns during placement - it can be installed across any two points needing symmetrical overvoltage protection, such as differential signal pairs (CAN_H/CAN_L), AC power inputs, or ungrounded sensor outputs. Unlike unidirectional TVS diodes, the SMCJ85CAHM3_A/I requires no orientation verification, simplifying layout and reducing assembly errors. Its terminals are electrically identical, and no cathode band marking is present.
What is the thermal resistance profile of SMCJ85CAHM3_A/I, and how does it impact PCB layout?
SMCJ85CAHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain reliability under repeated surges, PCB layout must provide adequate copper area for heat dissipation - undersized pads cause thermal runaway and premature failure. The SMCJ85CAHM3_A/I's low RθJL enables effective conduction cooling through the leads into the board, especially critical in high-density automotive modules.
Does SMCJ85CAHM3_A/I meet industry standards for surge immunity testing?
Yes, SMCJ85CAHM3_A/I is characterized for compliance with key surge immunity standards: its 1500 W PPPM rating aligns with IEC 61000-4-5 (10/1000 µs waveform), and its fast response supports IEC 61000-4-2 ESD protection. It is also UL Recognized (QVGQ2, file E136766) for both unidirectional and bidirectional configurations. The SMCJ85CAHM3_A/I's specified clamping behavior and leakage current ensure predictable performance in certified test setups - essential for passing EMC validation in automotive and industrial certifications.
SMCJ85CAHM3_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:
- 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/I FAQ
1.How can I place an order for SMCJ85CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAHM3_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 SMCJ85CAHM3_A/I reliable?
The price and inventory of SMCJ85CAHM3_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 SMCJ85CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ85CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAHM3_A/I?
SMCJ85CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAHM3_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 SMCJ85CAHM3_A/I?
For technical support, including SMCJ85CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ85CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAHM3_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 SMCJ85CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ85CAHM3_A/I?
All SMCJ85CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAHM3_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 SMCJ85CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ85CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CAHM3_A/I Tags
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