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Vishay General Semiconductor - Diodes Division SMBJ85-E3/52
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- Part No.:
- SMBJ85-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85-E3/52.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,196
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Product details
Overview
SMBJ85-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMBJ85-E3/52 datasheet, SMBJ85-E3/52 pinout, SMBJ85-E3/52 application, or SMBJ85-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant commercial-grade qualification, and direct alternative part comparisons for ESD and lightning transient suppression design.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp: reverse-biased during normal operation with ≤1.0 µA leakage at 85 V, then rapidly avalanches to limit transients above VBR. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance (dynamic impedance ≈ 10.2 Ω derived from ΔVC/ΔIPPM).
Thermal design relies on RθJA = 100 °C/W (junction-to-ambient, on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W (junction-to-lead), enabling sustained 5.0 W power dissipation at TA = 50 °C. It meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - guaranteed avalanche initiation range; defines minimum overvoltage threshold for clamping action. |
| VC @ IPPM | 137 V at IPPM = 4.4 A (10/1000 µs) - peak clamped voltage seen by downstream circuitry during worst-case surge. |
| PPPM | 600 W - peak transient energy handling capacity; determines survivability against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage ensures minimal standby power loss and no interference with high-impedance sensing nodes. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lowest potential node; completes conduction path during reverse transient clamp. |
| Cathode | High-side connection point | Connected to protected line (e.g., +12 V rail); blocks forward current, conducts reverse surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-event suppression of 4.4 A surges without degradation - sufficient for IEC 61000-4-5 4 kV open-circuit tests. |
| Glass passivated junction | Ensures repeatable, stable VBR over lifetime and temperature; eliminates parameter drift due to moisture or contamination. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile usage without baking - reduces manufacturing overhead and risk of popcorning. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements without halogen restrictions; suitable for non-automotive industrial and telecom applications. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - critical for safeguarding 100 V-rated MOSFETs and microcontrollers with tight VDD tolerance. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and bus voltage sense circuits against switching-induced transients in 48 V BLDC inverters. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus input to clamp inductive kickback spikes before they reach controller ICs. Use Value: Limits transient overshoot to ≤137 V, preventing latch-up or oxide breakdown in 100 V-rated SiC gate drivers and isolated amplifiers. |
Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges on long-line feeds. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side DC output, coordinated with upstream MOVs and filters. Use Value: Absorbs 600 W pulses without failure, maintaining system uptime during Category A/B lightning events per GR-1089-CORE. |
| Automotive Body Control Modules | Consumer Appliance Power Inputs |
|
Use Scenario: Reverse battery and load dump protection on LIN bus power rails and microcontroller VDD pins in BCMs. IC Role / Device Role / Timing Role: Standby-mode protector on 12 V supply line, activated only during >85 V transients (e.g., ISO 7637-2 Pulse 1/5a). Use Value: Withstands 100 A non-repetitive forward surge (IFSM), surviving load dump events while leaking <1 µA during normal 13.5 V operation. |
Use Scenario: Overvoltage guard on AC-DC adapter outputs feeding smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Final-stage clamp after bulk capacitor, suppressing residual ringing and ESD coupling into USB/ethernet PHYs. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) within nanoseconds, limiting voltage excursion to safe levels for 3.3 V/5 V logic interfaces. |
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-M3/52 | Halogen-free, RoHS-compliant variant; identical electrical specs and SMB package. | No difference in circuit function or layout; selected where halogen-free BOM compliance is mandated. | Choose when regulatory documentation requires halogen-free material declaration (e.g., EU WEEE, Japan JIS C 0950). |
| SMBJ85AHE3_B/H | AEC-Q101 qualified version; same VWM/VBR/VC but validated for automotive temperature cycling and humidity testing. | Required for under-hood or chassis-mounted applications subject to automotive qualification requirements. | Specify only if end equipment must meet AEC-Q101 stress test standards - not needed for commercial/industrial use. |
Compared with SMBJ85-E3/52, the M3 variant adds halogen-free compliance without altering performance, while the HE3 variant extends reliability validation to automotive-grade stress profiles - both retain identical pinout, thermal behavior, and clamping response, making them drop-in alternatives only when their specific compliance attributes are required.
Availability
SMBJ85-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and consumer appliance designs requiring stable component supply, consistent RoHS-compliant sourcing, and full traceability across production batches.
Supply support for SMBJ85-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, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in space-constrained surface-mount applications - targeting industrial, telecom, and automotive systems where fast clamping, low leakage, and robust surge endurance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ85-E3/52 under a 10/1000 µs surge?
The SMBJ85-E3/52 exhibits a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 4.4 A with a 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and represents the highest voltage imposed on the protected circuit during transient suppression - critical for ensuring downstream components remain within absolute maximum ratings.
Is SMBJ85-E3/52 suitable for bidirectional transient protection?
No, SMBJ85-E3/52 is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ85CA). Using SMBJ85-E3/52 in bidirectional applications would allow forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
What is the thermal resistance and power derating behavior of SMBJ85-E3/52?
SMBJ85-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. Its steady-state power dissipation (PD) is rated at 5.0 W at TA = 50 °C, derating linearly above that temperature per Figure 2 in the datasheet - reaching ~3.5 W at 75 °C ambient, which directly impacts long-term reliability in enclosed enclosures.
Does SMBJ85-E3/52 meet automotive qualification standards?
SMBJ85-E3/52 is RoHS-compliant and commercial-grade (E3 suffix), but it is not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the SMBJ85AHE3_B/H variant - identical electrically but tested to AEC-Q101 stress conditions including temperature cycling, humidity bias HAST, and mechanical shock.
How does the leakage current of SMBJ85-E3/52 affect high-impedance sensor circuits?
At its 85 V stand-off voltage (VWM), SMBJ85-E3/52 guarantees a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage avoids loading effects on high-impedance nodes such as thermistor dividers or precision voltage references - preserving measurement accuracy and minimizing offset errors in analog front-end designs.
SMBJ85-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ85-E3/52 FAQ
1.How can I place an order for SMBJ85-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85-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 SMBJ85-E3/52 reliable?
The price and inventory of SMBJ85-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 SMBJ85-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85-E3/52?
SMBJ85-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85-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 SMBJ85-E3/52?
For technical support, including SMBJ85-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85-E3/52 requirements.
6.How does Aetrix verify that SMBJ85-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85-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 SMBJ85-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85-E3/52?
All SMBJ85-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85-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 SMBJ85-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ85-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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