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Vishay General Semiconductor - Diodes Division SMCJ85CHE3/57T
- Part No.:
- SMCJ85CHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CHE3/57T.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,281
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Product details
Overview
SMCJ85CHE3/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and clamps transients to ≤137 V at 10.9 A IPPM - deployed on automotive power lines, industrial sensor interfaces, and telecom signal lines.
For engineers reviewing the SMCJ85CHE3/57T datasheet, SMCJ85CHE3/57T pinout, SMCJ85CHE3/57T application, or SMCJ85CHE3/57T equivalent, key selection criteria include its AEC-Q101 qualification, bi-directional surge capability, low clamping ratio (VC/VBR ≈ 1.38), RoHS-compliant HE3 terminations, and MSL Level 1 moisture sensitivity rating.
Technical Context
The SMCJ85CHE3/57T operates as a bi-directional avalanche diode with symmetrical clamping in both polarities, enabling protection against positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the DO-214AB package supports automated placement and meets UL 94 V-0 flammability.
Designed for 10/1000 μs waveform compliance per ANSI/IEEE C62.35, it delivers 1500 W peak pulse power with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W. The device is rated for TJ = –55 °C to +150 °C and qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 94.4 V / 104 V at IT = 1.0 mA - guaranteed avalanche onset range for reliable triggering |
| VC @ IPPM | 137 V at 10.9 A - clamped voltage during 1500 W transient, defining protected circuit stress level |
| PPPM | 1500 W - peak surge power handling per 10/1000 μs waveform, critical for ISO 7637-2 Pulse 1/2/5a immunity |
| ID @ VWM | ≤1.0 μA - ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance nodes |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SMCJ85CHE3/57T uses the DO-214AB (SMCJ) surface-mount package: 7.11 mm × 6.22 mm × 2.62 mm body, matte tin-plated leads, no polarity marking (bi-directional). Mounting requires 8.0 mm × 8.0 mm copper pads per terminal per Vishay's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | No functional distinction - terminals are interchangeable; clamping occurs identically in either direction |
| Case (body) | Non-connected mechanical structure | Electrically isolated; no thermal or electrical tie to junction - heat dissipation relies solely on lead conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, and ESD testing - suitable for engine control units and ADAS sensors |
| Bi-directional clamping | Identical VBR and VC performance in both polarities - eliminates need for polarity-aware board layout or orientation checks |
| Low clamping ratio (VC/VBR) | ~1.38 - minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage in MOSFETs |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking - reduces manufacturing complexity and cost |
| Glass-passivated junction | Stable VBR tolerance and low leakage over lifetime - maintains protection margin through thermal cycling and humidity exposure |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V supply rails in engine control modules against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Clamps 1500 W surges to ≤137 V, preventing brownout resets and permanent damage to downstream 5 V/3.3 V logic. | Use Scenario: Safeguarding analog outputs (4–20 mA, 0–10 V) and digital I/O (RS-485, CAN) of PLC I/O modules from ESD and inductive kickback. IC Role / Device Role / Timing Role: Fast-response shunt protector located at connector entry point, before signal conditioning circuitry. Use Value: Sub-1 ns response time limits transient energy coupled into precision amplifiers and ADC front-ends. |
| Telecom Signal Line Protection | Consumer Device USB/Power Port |
Use Scenario: Shielding Ethernet PHYs, xDSL line drivers, and base station RF front-end bias lines from lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Bi-directional TVS placed between transformer center-tap and ground or on differential pairs. Use Value: Symmetrical clamping preserves common-mode rejection ratio (CMRR) and avoids signal distortion in high-speed data paths. | Use Scenario: Hardening USB-C PD input ports and battery charging circuits in portable medical monitors and smart home hubs against user-handling ESD and adapter transients. IC Role / Device Role / Timing Role: Secondary-level surge absorber after primary fuse or polyfuse, directly at connector. Use Value: 1.0 μA leakage at 85 V ensures no impact on battery drain or charger detection accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-E3/52T | Lower PPPM (600 W), smaller SMB package (3.94 mm × 2.59 mm), same VWM/VBR range | Less robust for high-energy automotive pulses; suited for space-constrained consumer PCBs | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 ESD only |
| 1.5KE85CA | Through-hole DO-201 package, identical electrical specs but higher RθJA (100 °C/W), no AEC-Q101 qualification | Not suitable for automotive production; acceptable for industrial prototyping or legacy repair | Choose only for manual assembly or where reflow compatibility and automotive qualification are not required |
Compared with SMBJ85CA-E3/52T and 1.5KE85CA, the SMCJ85CHE3/57T offers superior surge handling (1500 W vs. 600 W/1500 W), AEC-Q101 validation, and optimized thermal performance (RθJL = 15 °C/W) - making it the preferred choice for production automotive and industrial systems requiring long-term reliability under repeated transient stress.
Availability
SMCJ85CHE3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom signal line surge suppression requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCJ85CHE3/57T 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® transient voltage suppressor family, engineered specifically for high-energy, fast-response overvoltage protection in harsh environments including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What does the "HE3" suffix indicate in SMCJ85CHE3/57T?
The HE3 suffix in SMCJ85CHE3/57T denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. This distinguishes it from commercial-grade E3 variants and confirms suitability for automotive under-hood applications where long-term reliability under thermal cycling is mandatory. The SMCJ85CHE3/57T meets all stress tests defined in AEC-Q101 Rev D.
Is SMCJ85CHE3/57T bi-directional or uni-directional?
SMCJ85CHE3/57T is a bi-directional TVS diode, as confirmed by its "CA" designation in the SMCJ85CA family and absence of cathode band marking. Electrical characteristics - including VBR, VC, and ID - apply identically in both directions, enabling symmetric clamping of positive and negative transients without polarity-dependent layout constraints.
What is the clamping voltage of SMCJ85CHE3/57T at its rated peak pulse current?
The clamping voltage (VC) of SMCJ85CHE3/57T is 137 V at its specified peak pulse current (IPPM) of 10.9 A, measured under the standardized 10/1000 μs waveform. This value defines the maximum voltage seen by downstream circuitry during a full-rated 1500 W transient event and is critical for ensuring protected ICs remain within absolute maximum ratings.
Does SMCJ85CHE3/57T require a heatsink for 1500 W surge handling?
No, SMCJ85CHE3/57T does not require an external heatsink for single-event 1500 W surge handling, as the energy is dissipated capacitively and thermally within milliseconds. However, its thermal resistance (RθJA = 75 °C/W) assumes mounting on 8.0 mm × 8.0 mm copper pads per terminal - this pad layout is essential to achieve rated PPPM and prevent junction overheating during repetitive surges.
How does the SMCJ85CHE3/57T compare to SMCJ85A in terms of polarity and application?
SMCJ85CHE3/57T is bi-directional (SMCJ85CA), whereas SMCJ85A is uni-directional. The CA version clamps transients of either polarity, making it ideal for AC-coupled lines, transformer-isolated interfaces, and automotive data buses like LIN or CAN where voltage reversals occur. The SMCJ85CHE3/57T eliminates polarity orientation errors during assembly and provides balanced protection without additional circuitry.
SMCJ85CHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 151V
- Current - Peak Pulse (10/1000µs):
- 9.9A
- 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)
SMCJ85CHE3/57T FAQ
1.How can I place an order for SMCJ85CHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CHE3/57T 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 SMCJ85CHE3/57T reliable?
The price and inventory of SMCJ85CHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85CHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CHE3/57T?
SMCJ85CHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CHE3/57T 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 SMCJ85CHE3/57T?
For technical support, including SMCJ85CHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CHE3/57T requirements.
6.How does Aetrix verify that SMCJ85CHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85CHE3/57T 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 SMCJ85CHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85CHE3/57T?
All SMCJ85CHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CHE3/57T, 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 SMCJ85CHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ85CHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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