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Vishay General Semiconductor - Diodes Division SMBJ85C-E3/52
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- Part No.:
- SMBJ85C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85C-E3/52.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,101
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Product details
Overview
SMBJ85C-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) 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 test current, 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current, and 600 W peak pulse power dissipation with 10/1000 µs waveform - deployed on power rails and signal lines of industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ85C-E3/52 datasheet, SMBJ85C-E3/52 pinout, SMBJ85C-E3/52 application, or SMBJ85C-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant commercial-grade packaging, and direct alternatives for overvoltage protection design validation.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VWM of 85 V and enters breakdown between 94.4 V and 104 V. Its low incremental surge resistance ensures stable clamping at 137 V under 4.4 A (10/1000 µs), limiting transient energy delivered to downstream ICs or MOSFETs.
Thermal performance is defined by RθJA = 100 °C/W (junction-to-ambient, on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W (junction-to-lead), enabling reliable operation up to TJ = 150 °C. The device meets MSL Level 1 per J-STD-020 and is rated for repetitive surge duty cycle ≤ 0.01 %.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 24/48 V DC systems. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 137 V at 4.4 A (10/1000 µs) - Clamping voltage defines worst-case voltage seen by protected circuit during surge event. |
| PPPM | 600 W - Peak pulse power handling capacity determines survivability against standardized lightning and EFT transients. |
| IPPM | 4.4 A - Peak surge current capability derived from VC and PPPM; validates robustness for IEC 61000-4-5 Level 3. |
| TJ max. | +150 °C - Maximum junction temperature enables use in high-ambient industrial environments without thermal shutdown. |
| RθJA | 100 °C/W - Thermal resistance value used to calculate junction temperature rise under steady-state power dissipation (PD = 5.0 W). |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Reverse voltage sensing / Clamping output node | Connected to protected line (e.g., 85 V rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 surge immunity requirements for industrial equipment. |
| Clamping voltage ≤ 137 V at 4.4 A | Ensures protected MOSFETs or controllers remain below absolute maximum ratings during 1 kV/2 kV surge tests. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (< 1 ns rise time), improving protection fidelity. |
| MSL Level 1, peak reflow ≤ 260 °C | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets environmental compliance for global industrial and telecom deployments without halogen restrictions. |
Applications
| Industrial Motor Drive Power Rails | Telecom Ethernet PHY Protection |
|---|---|
|
Use Scenario: Suppresses inductive kickback from relay coils and H-bridge freewheeling paths in 48 V DC motor control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48 V supply and ground, clamping transients exceeding 85 V within nanoseconds. Use Value: Prevents gate oxide damage to N-channel MOSFETs by limiting drain-source voltage spikes to ≤137 V during 600 W surge events. |
Use Scenario: Shields 10/100/1000BASE-T Ethernet PHY transceivers from ESD and lightning-induced surges on RJ45 line pairs. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on differential pairs, referenced to chassis ground with 85 V standoff. Use Value: Maintains signal integrity by clamping common-mode surges to <137 V while preserving PHY's 1.2 V CMOS input thresholds. |
| Automotive Body Control Module (BCM) Inputs | Programmable Logic Controller (PLC) Digital I/O |
|
Use Scenario: Protects microcontroller GPIOs and LIN bus receivers from load dump and jump-start transients in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Unidirectional clamp on switched 12 V inputs feeding optocouplers or level shifters in BCM subassemblies. Use Value: Survives ISO 7637-2 Pulse 5a (75 V/350 ms) and Pulse 1 (−150 V/200 ms) due to 150 °C junction rating and 100 A IFSM surge margin. |
Use Scenario: Guards 24 V digital input channels in industrial PLC backplanes against field-wiring transients and ground bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS on each 24 V input line, positioned upstream of Schmitt-trigger input buffers. Use Value: Enables EN 61000-4-4 EFT immunity (±2 kV) and EN 61000-4-5 surge immunity (±1 kV) without signal distortion or latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-E3/52 | Unidirectional, identical VWM/VBR/VC, same SMB package and RoHS compliance. | No functional difference; SMBJ85A-E3/52 is the base designation - SMBJ85C-E3/52 reflects same device with "C" denoting Vishay's internal revision code. | Select SMBJ85A-E3/52 if sourcing from distributors listing base nomenclature; both share identical electrical and mechanical specs. |
| SMCJ85A-E3/57 | Same VWM/VBR/VC, but in larger SMC (DO-214AB) package with higher PPPM = 1500 W and IPPM = 11.1 A. | Better suited for higher-energy surges (e.g., outdoor telecom cabinets), but requires larger PCB footprint and different pad layout. | Choose SMCJ85A-E3/57 only when 600 W is insufficient and board space allows SMC footprint; not drop-in compatible. |
Compared with SMBJ85C-E3/52, SMBJ85A-E3/52 offers identical protection performance in the same SMB package, while SMCJ85A-E3/57 provides 2.5× higher surge power handling at the cost of increased size and layout redesign - making SMBJ85C-E3/52 optimal for space-constrained 600 W-class industrial and telecom applications.
Availability
SMBJ85C-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom Ethernet interfaces, automotive body control modules, and PLC digital I/O requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ85C-E3/52 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive electronics where consistent clamping and thermal stability are critical.
FAQ
What is the clamping voltage of SMBJ85C-E3/52 under a 10/1000 µs surge?
The SMBJ85C-E3/52 has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMBJ85C-E3/52 maintains this clamping performance across its specified operating temperature range.
Is SMBJ85C-E3/52 RoHS-compliant and lead-free?
Yes, SMBJ85C-E3/52 is RoHS-compliant and lead-free, indicated by the "E3" suffix per Vishay's ordering nomenclature. It uses matte tin-plated leads and conforms to J-STD-002 and JESD 22-B102 solderability standards. The molding compound meets UL 94 V-0 flammability rating, and the device is qualified to MSL Level 1 with peak reflow temperature up to 260 °C.
Does SMBJ85C-E3/52 support bidirectional transient suppression?
No, SMBJ85C-E3/52 is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Bidirectional variants use the "CA" suffix (e.g., SMBJ85CA). The "C" in SMBJ85C-E3/52 denotes a Vishay internal revision code, not bidirectionality - confirmed by its cathode band marking and specification table listing only unidirectional parameters.
What is the maximum junction temperature rating for SMBJ85C-E3/52?
The SMBJ85C-E3/52 has a maximum junction temperature (TJ) rating of +150 °C, allowing operation in high-ambient industrial enclosures and automotive under-hood environments. This rating is supported by its thermal resistance values: RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W, enabling accurate thermal design for continuous and pulsed power dissipation scenarios.
How does SMBJ85C-E3/52 differ from SMBJ85A-E3/52?
SMBJ85C-E3/52 and SMBJ85A-E3/52 are electrically and mechanically identical - the "C" suffix indicates a Vishay internal revision code, not a functional change. Both share the same VWM = 85 V, VBR = 94.4–104 V, VC = 137 V, SMB package, and RoHS-compliant E3 termination. Distributors may list either part number; SMBJ85C-E3/52 is fully interchangeable with SMBJ85A-E3/52 in all designs.
SMBJ85C-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 4A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ85C-E3/52 FAQ
1.How can I place an order for SMBJ85C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85C-E3/52 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 SMBJ85C-E3/52 reliable?
The price and inventory of SMBJ85C-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85C-E3/52?
SMBJ85C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85C-E3/52 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 SMBJ85C-E3/52?
For technical support, including SMBJ85C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85C-E3/52 requirements.
6.How does Aetrix verify that SMBJ85C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85C-E3/52 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 SMBJ85C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85C-E3/52?
All SMBJ85C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85C-E3/52, 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 SMBJ85C-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ85C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85C-E3/52 Tags
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