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Vishay General Semiconductor - Diodes Division SMCJ85CAHE3/57T
- Part No.:
- SMCJ85CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAHE3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,370
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Product details
Overview
SMCJ85CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection of sensitive electronics. 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 across automotive sensor lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMCJ85CAHE3/57T datasheet, SMCJ85CAHE3/57T pinout, SMCJ85CAHE3/57T application, or SMCJ85CAHE3/57T 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 RoHS-compliant matte tin plating per J-STD-002.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding its breakdown voltage (VBR min = 94.4 V, max = 104 V at 1 mA), it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and fast response time (<1 ns), critical for protecting MOSFET gates and microcontroller I/O pins.
Designed for surface-mount automated assembly, the SMCJ85CAHE3/57T uses a low-profile SMC package with MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility. Its bidirectional configuration eliminates polarity concerns in AC-coupled or differential signal paths such as CAN bus stubs, Ethernet PHY interfaces, and automotive LIN lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC RMS operating margin. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - breakdown threshold range; ensures reliable turn-on above normal operating voltage with margin. |
| VC @ IPPM | 137 V at 10.9 A - clamped voltage during 10/1000 µs surge; determines maximum stress on protected ICs. |
| PPPM | 1500 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity. |
| ID @ VWM | <1 µA - ultra-low reverse leakage; prevents signal distortion or bias shift in high-impedance sensor circuits. |
| TJ Range | –55 °C to +150 °C - extended junction temperature rating enables under-hood automotive use without derating. |
| RθJA | 75 °C/W - thermal resistance to ambient on standard 8 mm × 8 mm copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional - no polarity marking; symmetrical cathode/anode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current return path (bidirectional) | Connects to ground or reference plane; carries full IPPM during either polarity transient. |
| Cathode | Surge current return path (bidirectional) | Electrically identical to Anode in CA devices; forms symmetrical clamping pair across protected line. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Glass passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates parameter drift in harsh industrial environments. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving protection margin for 3.3 V/5 V logic. |
| MSL Level 1, 260 °C peak | Enables single-pass lead-free reflow without baking; reduces manufacturing cost and process complexity. |
| Matte tin plating | Meets J-STD-002 solderability and JESD22-B102 whisker resistance Class 2 - ensures long-term interconnect integrity. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and chassis ground to limit voltage excursions to ≤137 V. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC drivers during 12 V system transients up to 1500 W. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers interfacing with solenoid valves and contactors. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing inductive kickback surges (IEC 61000-4-4, 4 kV) on field wiring. Use Value: Maintains signal integrity by clamping transients within 1 ns, avoiding false triggering of optocoupler inputs. |
| Telecom Line Interface | Consumer Power Adapter ESD |
|
Use Scenario: Shielding RS-485 transceiver pins in base station backhaul equipment from lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Differential-mode TVS across A/B lines, leveraging bidirectional symmetry to handle ±137 V clamping equally. Use Value: Enables compliance with ITU-T K.20/21 secondary protection requirements without adding series impedance. |
Use Scenario: ESD and surge suppression on USB-C CC and VBUS lines in wall-mounted AC/DC adapters certified to UL 62368-1. IC Role / Device Role / Timing Role: Primary-level TVS placed at connector entry point to shunt human-body-model (HBM) and system-level surges. Use Value: Survives >10000 cycles of ±8 kV contact discharge while maintaining <1 µA leakage at 85 V standby. |
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 | Lower PPPM (600 W), same VWM/VBR/VC, SMB package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for 1500 W automotive load dump. | Select when board space is constrained and surge threat level is ≤600 W. |
| SMCJ85CAHM3/57T | Identical electrical specs and AEC-Q101 qualification; halogen-free molding compound instead of standard RoHS-compliant epoxy. | Required only where halogen-free compliance (e.g., JEDEC J-STD-709) is mandated in final product bill-of-materials. | Choose for green manufacturing programs without performance trade-offs. |
Compared with SMBJ85CAHE3/A, the SMCJ85CAHE3/57T delivers 2.5× higher surge power handling and superior thermal dissipation; versus SMCJ85CAHM3/57T, it offers identical protection performance with standard RoHS compliance - making it the default choice for cost-sensitive AEC-Q101 designs.
Availability
SMCJ85CAHE3/57T is available at Aetrix Electronics and suitable for automotive sensor systems, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ85CAHE3/57T 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, precision, and automotive qualification.
The SMCJ series targets high-power transient suppression in demanding environments - engineered specifically for automotive, industrial, and telecom applications where robustness against repetitive surges and extended temperature operation are mandatory.
FAQ
What does the "CA" suffix indicate in SMCJ85CAHE3/57T?
The "CA" suffix denotes a bidirectional configuration: SMCJ85CAHE3/57T provides symmetrical clamping for both positive and negative transients, unlike unidirectional "A" variants. This eliminates polarity dependency in AC-coupled or differential signal paths, and is confirmed in Vishay's documentation where "CA" devices apply electrical characteristics in both directions.
Is SMCJ85CAHE3/57T qualified to AEC-Q101?
Yes, SMCJ85CAHE3/57T is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet revision 09-Jan-2024 under "Mechanical Data" and "Ordering Information". The "HE3" suffix indicates RoHS-compliant and AEC-Q101 qualified commercial grade, validated for automotive under-hood and chassis applications.
What is the maximum clamping voltage of SMCJ85CAHE3/57T and at what current?
The maximum clamping voltage (VC) of SMCJ85CAHE3/57T is 137 V, measured at a peak pulse current (IPPM) of 10.9 A using the standard 10/1000 µs waveform. This value is specified in the "Electrical Characteristics" table on page 2 of the Vishay document number 88394.
Can SMCJ85CAHE3/57T be used in place of a unidirectional TVS like SMCJ85AHE3/57T?
No - SMCJ85CAHE3/57T is bidirectional and lacks polarity marking, while SMCJ85AHE3/57T is unidirectional with cathode band identification. Substitution requires verifying circuit topology: bidirectional use is mandatory for AC signals or differential pairs; unidirectional is required for DC-biased rails where reverse conduction must be blocked.
What is the thermal resistance junction-to-ambient (RθJA) for SMCJ85CAHE3/57T?
The typical thermal resistance junction-to-ambient (RθJA) for SMCJ85CAHE3/57T is 75 °C/W, measured on the minimum recommended pad layout (0.31" × 0.31" copper pads per terminal). This value is listed in the "Thermal Characteristics" section of the Vishay datasheet and directly impacts PCB thermal design for sustained surge duty cycles.
SMCJ85CAHE3/57T 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)
SMCJ85CAHE3/57T FAQ
1.How can I place an order for SMCJ85CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAHE3/57T 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 SMCJ85CAHE3/57T reliable?
The price and inventory of SMCJ85CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAHE3/57T?
SMCJ85CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAHE3/57T 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 SMCJ85CAHE3/57T?
For technical support, including SMCJ85CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ85CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAHE3/57T 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 SMCJ85CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85CAHE3/57T?
All SMCJ85CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAHE3/57T, 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 SMCJ85CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ85CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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