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Vishay General Semiconductor - Diodes Division SMCJ85CAHE3/9AT
- Part No.:
- SMCJ85CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAHE3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,254
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Product details
Overview
SMCJ85CAHE3/9AT 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 stand-off voltage (VWM), and clamping voltage of 137 V at 10.9 A peak pulse current. It protects sensitive ICs and MOSFETs against inductive switching transients and lightning-induced surges in automotive and industrial power rails.
For engineers reviewing the SMCJ85CAHE3/9AT datasheet, SMCJ85CAHE3/9AT pinout, SMCJ85CAHE3/9AT application, or SMCJ85CAHE3/9AT equivalent, this AEC-Q101 qualified TVS offers verified bidirectional clamping, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level ESD/surge resilience validation and high-reliability power interface design.
Technical Context
This device operates as a voltage-clamped shunt protector: when reverse (or forward, in bidirectional mode) voltage exceeds its breakdown threshold (94.4–104 V at 1 mA), it avalanches to limit transient energy by diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1 μA at 85 V) and fast response time (<1 ns).
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to +150 °C junction temperature. The SMCJ85CAHE3/9AT is rated for non-repetitive 10/1000 μs waveform surges and meets UL 497B recognition for telecom and industrial protectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 72–85 V DC power rails. |
| VBR (Breakdown Voltage) | 94.4–104 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events without premature conduction. |
| VC (Clamping Voltage) | 137 V at IPPM = 10.9 A - Peak voltage seen across protected circuit during full-rated 1500 W surge; determines maximum stress on downstream components. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity under standardized 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity compliance. |
| ID (Reverse Leakage) | <1 μA at 85 V - Ultra-low leakage preserves efficiency in high-impedance bias networks and avoids false triggering in precision sensor interfaces. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures without derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling; supports PPAP documentation. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode for reverse polarity) | Bidirectional terminal | No polarity marking; symmetric terminals enable identical clamping in both directions - eliminates orientation errors during automated placement. |
| Anode (Cathode for reverse polarity) | Bidirectional terminal | Electrically identical to cathode; dual-terminal symmetry simplifies PCB layout and supports AC-coupled signal line protection without directionality constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses, or floating power domains without external polarity management. |
| 1500 W peak pulse power | Supports robust IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) in industrial and automotive gate driver circuits. |
| Glass passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and lifetime - critical for safety-critical power monitoring paths. |
| AEC-Q101 qualification (HE3 suffix) | Validates reliability for automotive applications including engine control units, body electronics, and ADAS power supplies. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (<1 ns response), reducing voltage stress on protected MOSFETs and microcontrollers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at power entry point to clamp surges before reaching LDOs and MCU power pins. Use Value: Clamps to 137 V at 10.9 A, limiting stress on 36 V-rated input stages and enabling compliance with ISO 16750-2 harsh environment requirements. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: Bidirectional TVS on differential signal pairs (e.g., RS-485, CAN FD stubs) to absorb ESD and cable discharge events. Use Value: Symmetric clamping prevents signal inversion or latch-up during ±8 kV contact ESD (IEC 61000-4-2), preserving data integrity without adding series impedance. |
| Telecom Line Card Surge Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Secondary surge protection on POTS or xDSL line cards after primary gas discharge tube (GDT) stage. IC Role / Device Role / Timing Role: Fast-response secondary limiter that handles residual energy not diverted by upstream GDT, preventing damage to SLIC and codec ICs. Use Value: Sub-1 ns response captures fast-rising transients missed by slower primary protectors, reducing clamping overshoot below 137 V for 75 Ω impedance-matched lines. |
Use Scenario: Protecting high-side/low-side gate drivers in BLDC inverters from Miller-induced voltage spikes during IGBT/MOSFET switching. IC Role / Device Role / Timing Role: Localized TVS across gate-source terminals to clamp dv/dt-induced spikes and prevent false turn-on or gate oxide rupture. Use Value: 85 V VWM aligns with 15–20 V gate drive rails; 137 V VC limits spike amplitude well below typical 200 V gate oxide breakdown thresholds. |
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 | Lower PPPM (400 W), same VWM (85 V), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for load dump or high-current industrial transients. | Select when space-constrained layouts prioritize size over surge margin, and thermal management allows higher junction rise. |
| SMCJ85AHE3/9AT | Unidirectional variant; identical VWM, VBR, VC, and PPPM but asymmetric conduction (cathode-marked) | Requires correct polarity placement; cannot protect AC or floating signals; used where reverse-bias blocking is required (e.g., DC power input only). | Choose only for unidirectional DC rails where polarity is fixed and reverse conduction must be blocked - not a drop-in replacement for bidirectional use. |
Compared with SMAJ85CAHE3/A and SMCJ85AHE3/9AT, the SMCJ85CAHE3/9AT uniquely delivers bidirectional 1500 W surge handling in an AEC-Q101 qualified SMC package - making it the sole option among these three for automotive-grade, polarity-agnostic protection of high-energy power and signal lines.
Availability
SMCJ85CAHE3/9AT is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drives, telecom line cards, and sensor interface modules requiring stable component supply with full AEC-Q101 traceability and 13" tape-and-reel delivery.
Supply support for SMCJ85CAHE3/9AT 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCJ series was engineered specifically for high-power transient suppression in harsh environments, emphasizing AEC-Q101 qualification, low clamping ratio, and robust surge endurance - targeting mission-critical power rail and interface protection.
FAQ
What is the clamping voltage of the SMCJ85CAHE3/9AT at its rated peak pulse current?
The SMCJ85CAHE3/9AT has a maximum clamping voltage (VC) of 137 V at 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 defines the upper voltage limit imposed on protected circuitry during full-rated surge events. The SMCJ85CAHE3/9AT maintains this clamping performance across its operational temperature range, supporting predictable system-level surge design.
Is the SMCJ85CAHE3/9AT suitable for automotive applications?
Yes, the SMCJ85CAHE3/9AT is AEC-Q101 qualified and carries the HE3 suffix indicating RoHS-compliance and automotive-grade reliability testing. It is validated for use in engine control units, body electronics, and ADAS power supplies where compliance with ISO 7637-2 (load dump) and ISO 16750-2 is required. The SMCJ85CAHE3/9AT's 1500 W surge rating and +150 °C TJ max. make it appropriate for under-hood and chassis-mounted automotive systems.
How does the bidirectional configuration of the SMCJ85CAHE3/9AT affect PCB layout?
The SMCJ85CAHE3/9AT has no polarity marking and identical electrical behavior in both directions, eliminating orientation constraints during automated placement. This simplifies PCB layout for AC-coupled lines, differential buses (e.g., RS-485), or floating power domains where voltage polarity may reverse. Unlike unidirectional variants such as SMCJ85AHE3/9AT, the SMCJ85CAHE3/9AT requires no cathode band alignment - reducing assembly error risk and enabling symmetrical pad design.
What is the thermal resistance of the SMCJ85CAHE3/9AT, and how does it impact heatsinking?
The SMCJ85CAHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. These values indicate moderate self-heating under sustained power dissipation; however, the device is intended for transient (not continuous) operation. For repeated surge events, minimizing RθJA via adequate copper area is essential to maintain TJ ≤ +150 °C - the SMCJ85CAHE3/9AT's absolute maximum junction temperature.
Does the SMCJ85CAHE3/9AT meet any safety agency certifications?
Yes, the SMCJ85CAHE3/9AT is Underwriters Laboratories (UL) recognized under file number E136766 for both unidirectional and bidirectional transient protectors, compliant with UL 497B for telecommunications and industrial applications. This certification covers construction, flammability (UL 94 V-0 molding compound), and electrical performance - confirming suitability for safety-critical surge protection in certified end equipment. The SMCJ85CAHE3/9AT's UL listing is documented in Vishay's official certification records.
SMCJ85CAHE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ85CAHE3/9AT FAQ
1.How can I place an order for SMCJ85CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAHE3/9AT 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 SMCJ85CAHE3/9AT reliable?
The price and inventory of SMCJ85CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ85CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAHE3/9AT?
SMCJ85CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAHE3/9AT 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 SMCJ85CAHE3/9AT?
For technical support, including SMCJ85CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ85CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAHE3/9AT 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 SMCJ85CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ85CAHE3/9AT?
All SMCJ85CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAHE3/9AT, 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 SMCJ85CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ85CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CAHE3/9AT Tags
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