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Vishay General Semiconductor - Diodes Division SMCJ85A-E3/57T
- Part No.:
- SMCJ85A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85A-E3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:697
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Product details
Overview
SMCJ85A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), and clamps to ≤137 V at 10.9 A (10/1000 μs waveform).
For engineers reviewing the SMCJ85A-E3/57T datasheet, SMCJ85A-E3/57T pinout, SMCJ85A-E3/57T application, or SMCJ85A-E3/57T equivalent, key selection criteria include its unidirectional polarity, 1.0 μA max reverse leakage at VWM, 0.106 %/°C temperature coefficient of VBR, and AEC-Q101 qualification readiness via HE3 suffix variants.
Technical Context
The SMCJ85A-E3/57T operates as a clamping-type TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) to transient overvoltages. Its glass-passivated junction ensures stable electrical characteristics and low incremental surge resistance under repetitive surge stress.
Designed for surface-mount assembly on standard PCB pads (0.31" × 0.31" copper), it meets J-STD-020 MSL Level 1 and supports automated placement. The cathode band denotes polarity, and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
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 at 1 mA - Confirmed breakdown range defining reliable turn-on threshold |
| VC @ IPPM | ≤137 V at 10.9 A - Clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 1500 W - Peak transient energy absorption capability under standardized waveform |
| ID @ VWM | ≤1.0 μA - Ultra-low leakage ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - Maximum junction temperature enabling operation in high-ambient industrial environments |
| RθJA | 75 °C/W - Thermal resistance indicating need for adequate copper pad area for thermal management |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0 flammability rating; dimensions 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); cathode marked with band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground or low-side reference | Completes conduction path during transient clamp; must be routed with low-inductance trace to minimize voltage overshoot |
| Cathode | Current exit terminal in forward bias; marked with band; connects to line/voltage rail being protected | Serves as the high-side connection point for unidirectional clamping; polarity-critical for correct protection orientation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables compact PCB layout in space-constrained automotive and industrial modules |
| Glass-passivated junction | Ensures long-term reliability and stable VBR drift under thermal cycling and humidity exposure |
| 1500 W peak pulse power | Provides robust immunity against IEC 61000-4-5 Level 4 (4 kV surge) when properly mounted |
| AEC-Q101 qualification option | HE3/HM3 suffix variants support automotive-grade deployment without redesign |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility without dry-pack handling |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going surges. Use Value: Limits transient voltage to ≤137 V, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation systems. IC Role / Device Role / Timing Role: TVS mounted across differential or single-ended signal lines to absorb ESD and switching noise. Use Value: Sub-1 ns response preserves signal fidelity while maintaining <1 μA leakage at 85 V nominal rail. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, absorbing common-mode transients on DC input. Use Value: 1500 W PPPM rating sustains multiple 10/1000 μs surges without degradation in harsh field environments. | Use Scenario: Adding secondary overvoltage protection on USB-C PD adapter 20 V output rails. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after DC-DC converter to catch post-regulator transients. Use Value: 85 V VWM aligns with 20 V nominal + margin, while 137 V VC prevents downstream IC latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-E3/52T | Lower PPPM (600 W), SMB package (smaller footprint, higher RθJA) | Suitable only for lower-energy transients; not recommended for IEC 61000-4-5 Level 4 | Select when board space is critical and surge threat level is limited to IEC 61000-4-2 ESD or low-energy switching noise. |
| 1.5KE85A | Through-hole DO-201 package, same VWM/VBR/VC specs, higher RθJA (100 °C/W) | Requires wave soldering; less suitable for high-density SMT production | Choose for legacy through-hole designs or prototyping where manual assembly is acceptable. |
Compared with SMBJ85A-E3/52T and 1.5KE85A, the SMCJ85A-E3/57T delivers superior surge robustness in an SMT-optimized package, balancing PCB area, thermal performance, and industrial-grade reliability without requiring layout changes for existing SMC footprints.
Availability
SMCJ85A-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, and telecom DC input protection requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMCJ85A-E3/57T 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series belongs to Vishay's TRANSZORB® TVS portfolio, engineered for high-energy transient suppression in automotive, industrial, and communications infrastructure where consistent clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the SMCJ85A-E3/57T under a 10/1000 μs surge?
The SMCJ85A-E3/57T has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 10.9 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The clamping performance ensures downstream ICs remain within safe operating voltage limits during surge events. SMCJ85A-E3/57T maintains this specification across its qualified temperature range.
Is the SMCJ85A-E3/57T RoHS-compliant and halogen-free?
Yes, the SMCJ85A-E3/57T carries the "E3" suffix, indicating it is RoHS-compliant and commercial-grade, with matte tin-plated leads and molding compound meeting UL 94 V-0. It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (e.g., SMCJ85A-M3/57T) must be selected. Both E3 and M3 meet JESD 201 Class 2 whisker testing requirements. SMCJ85A-E3/57T documentation confirms full RoHS alignment per EU Directive 2011/65/EU.
Does the SMCJ85A-E3/57T have AEC-Q101 qualification?
No, the SMCJ85A-E3/57T itself is not AEC-Q101 qualified; however, Vishay offers functionally identical variants with "HE3" (RoHS-compliant + AEC-Q101) or "HM3" (halogen-free + RoHS + AEC-Q101) suffixes, such as SMCJ85AHE3_A/H. These automotive-grade versions share identical electrical specs and SMC package but undergo additional stress testing per AEC-Q101. SMCJ85A-E3/57T serves commercial/industrial applications where automotive qualification is not mandated.
What is the thermal resistance junction-to-ambient for the SMCJ85A-E3/57T?
The typical thermal resistance junction-to-ambient (RθJA) for the SMCJ85A-E3/57T is 75 °C/W, measured on a standard 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. This value assumes minimum recommended PCB layout per Vishay's datasheet Figure 2. Higher ambient temperatures require derating of power dissipation-e.g., at TA = 75 °C, PD drops to ~4.3 W. SMCJ85A-E3/57T's RθJA directly impacts sustained surge repetition rate and long-term reliability in enclosed enclosures.
How does the SMCJ85A-E3/57T differ from bidirectional SMCJ85CA variants?
The SMCJ85A-E3/57T is unidirectional, with polarity indicated by a cathode band and intended for DC line protection where only positive transients occur. In contrast, SMCJ85CA is bidirectional, symmetrical in both directions, used for AC lines or data lines with bipolar threats. Key differences include: no polarity marking on SMCJ85CA, doubled ID limit (2.0 μA vs. 1.0 μA) for VWM ≤10 V devices (not applicable here), and identical VBR/VWM/VC specs otherwise. SMCJ85A-E3/57T cannot substitute for SMCJ85CA in AC-coupled applications without circuit redesign.
SMCJ85A-E3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ85A-E3/57T FAQ
1.How can I place an order for SMCJ85A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85A-E3/57T 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 SMCJ85A-E3/57T reliable?
The price and inventory of SMCJ85A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85A-E3/57T?
SMCJ85A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85A-E3/57T 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 SMCJ85A-E3/57T?
For technical support, including SMCJ85A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85A-E3/57T requirements.
6.How does Aetrix verify that SMCJ85A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85A-E3/57T 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 SMCJ85A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85A-E3/57T?
All SMCJ85A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85A-E3/57T, 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 SMCJ85A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ85A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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