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Vishay General Semiconductor - Diodes Division SMAJ85-E3/5A
- Part No.:
- SMAJ85-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85-E3/5A.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
SMAJ85-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features 85 V stand-off voltage (VWM), 151 V maximum clamping voltage (VC) at 2.0 A peak pulse current, 400 W peak pulse power (10/1000 µs), and operates from −55 °C to +150 °C - used for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ85-E3/5A datasheet, SMAJ85-E3/5A pinout, SMAJ85-E3/5A application, or SMAJ85-E3/5A equivalent, key selection criteria include verified clamping performance at rated surge current, unidirectional polarity marking, RoHS-compliant matte tin terminations, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2 × 0.2″ copper pads.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response (<1 ps) and low incremental surge resistance. Its breakdown voltage (VBR) is specified at 94.4–115 V with 1 mA test current, ensuring reliable triggering above the 85 V stand-off threshold while maintaining <1 µA reverse leakage at VWM.
Thermal design is supported by RθJA = 120 °C/W and RθJL = 30 °C/W, enabling operation up to 150 °C junction temperature. The device meets JESD201 Class 1A whisker resistance and is rated for 40 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for inductive load switching protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates |
| VC @ IPPM | 151 V at 2.0 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling capability under standard waveform, derated above 78 V |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), critical for relay/coil suppression |
| TJ Range | −55 °C to +150 °C - Enables use in automotive under-hood and industrial motor drive environments |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking, compatible with IPC-7351B footprint |
| RoHS | Compliant per 2002/95/EC - Lead-free matte tin plating, J-STD-002 solderability certified |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two leads; cathode indicated by a band on one end. Leads are matte tin-plated, solderable per J-STD-002 and JESD22-B102. Mounting requires 0.2 × 0.2″ (5.0 × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (for uni-directional operation) | Connected to lower-potential side of protected line; conducts only during reverse overvoltage |
| Cathode (banded end) | Clamping reference node | Connected to higher-potential rail (e.g., VCC or signal high); defines polarity and clamping threshold |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling |
| 400 W peak pulse power (10/1000 µs) | Handles typical ESD and lightning-induced surges in industrial I/O without degradation |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking preconditioning |
| Low clamping ratio (VC/VWM = 1.78) | Minimizes voltage overshoot during transients, improving margin for 100 V-rated components |
| JESD201 Class 1A whisker resistance | Prevents tin whisker growth in high-reliability applications including telecom infrastructure |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O against back-EMF from brushed DC motors and solenoids. IC Role / Device Role / Timing Role: Unidirectional clamping element placed across motor coil or relay coil terminals. Use Value: Limits induced spikes to ≤151 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic and 60 V MOSFETs. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between VBAT and GND near ECUs. Use Value: Withstands 40 A surge pulses while holding clamp voltage below 151 V, meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
| Telecom Power Rectification | Consumer Appliance Control Boards |
Use Scenario: Input-stage protection for AC-DC adapters and PoE injectors subjected to lightning-induced surges on primary-side windings. IC Role / Device Role / Timing Role: Primary-side TVS parallel to bridge rectifier output or bulk capacitor. Use Value: 400 W pulse rating absorbs 10/1000 µs transients without failure, preserving downstream PWM controllers and optocouplers. |
Use Scenario: Overvoltage safeguard for microcontroller reset lines and front-panel button inputs in washing machines and HVAC systems. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) clamping diode tied between signal line and VDD. Use Value: 85 V VWM avoids false triggering during normal 24 V control signals while clamping ESD events to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/5A | Lower clamping voltage (137 V vs. 151 V) due to tighter VBR range (94.4–104 V); same VWM, PPPM, and package | Better suited for 100 V-rated circuits requiring tighter clamping margin; slightly higher cost | Select SMAJ85A-E3/5A when downstream component VDS(max) or VIN(max) is ≤140 V |
| SMBJ85A-E3/52 | DO-214AA (SMB) package (larger footprint, higher PPPM = 600 W); identical electrical specs except IPPM = 3.0 A and VC = 137 V | Requires PCB layout change; preferred where higher surge margin or legacy SMB footprint exists | Choose SMBJ85A-E3/52 only if board space allows larger package and 600 W rating is required |
Compared with SMAJ85-E3/5A, the SMAJ85A-E3/5A offers tighter clamping for margin-critical designs without layout change, while SMBJ85A-E3/52 trades compactness for higher surge capacity - neither is pin-compatible, but both serve overlapping protection roles in industrial and automotive systems.
Availability
SMAJ85-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power rectification requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ85-E3/5A 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, thermal performance, and AEC-Q101 qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, automotive electronics, and telecom infrastructure where consistent clamping behavior and high surge endurance are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ85-E3/5A under a 10/1000 µs surge?
The SMAJ85-E3/5A has a maximum clamping voltage (VC) of 151 V when subjected to its rated peak pulse current of 2.0 A using the standardized 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 in Vishay document 88390, and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the SMAJ85-E3/5A unidirectional or bidirectional, and how is polarity identified?
The SMAJ85-E3/5A is a unidirectional TVS diode. Polarity is identified by a cathode band marked on the banded end of the DO-214AC (SMA) package - this end connects to the higher-potential side (e.g., VCC or signal high) during circuit implementation. Bidirectional variants use the "CA" suffix (e.g., SMAJ85CA).
Does the SMAJ85-E3/5A meet automotive qualification standards?
The SMAJ85-E3/5A is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ85AHE3/5A variant (with HE3 suffix), which is explicitly rated for high-reliability automotive use and qualified per AEC-Q101. Always verify qualification status via the full part number before deployment in vehicle systems.
What is the recommended PCB pad layout for optimal thermal and surge performance of the SMAJ85-E3/5A?
Vishay specifies a minimum 0.2 × 0.2″ (5.0 × 5.0 mm) copper pad area for each terminal of the SMAJ85-E3/5A to ensure rated 400 W pulse power dissipation and thermal stability. This layout reduces thermal impedance and prevents solder joint fatigue during repetitive surge events - deviating from this recommendation may degrade clamping consistency and lifetime reliability.
Can the SMAJ85-E3/5A be used in place of the SMAJ85A-E3/5A?
No - the SMAJ85-E3/5A and SMAJ85A-E3/5A are not interchangeable without design review. While both share the same VWM (85 V) and package, the SMAJ85A-E3/5A has a lower clamping voltage (137 V vs. 151 V) and tighter breakdown range (94.4–104 V vs. 94.4–115 V). Substituting may cause over-clamping or insufficient protection depending on downstream voltage ratings.
SMAJ85-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 2A
- Power - Peak Pulse:
- 300W
- 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-214AC (SMA)
SMAJ85-E3/5A FAQ
1.How can I place an order for SMAJ85-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85-E3/5A 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 SMAJ85-E3/5A reliable?
The price and inventory of SMAJ85-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ85-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85-E3/5A?
SMAJ85-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85-E3/5A 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 SMAJ85-E3/5A?
For technical support, including SMAJ85-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85-E3/5A requirements.
6.How does Aetrix verify that SMAJ85-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ85-E3/5A 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 SMAJ85-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ85-E3/5A?
All SMAJ85-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85-E3/5A, 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 SMAJ85-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ85-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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