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Vishay General Semiconductor - Diodes Division SMAJ85-E3/61
- Part No.:
- SMAJ85-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85-E3/61.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,231
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Product details
Overview
SMAJ85-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection of sensitive electronics. It features a 85 V stand-off voltage (VWM), 151 V maximum clamping voltage (VC) at 2.0 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - ideal for safeguarding MOSFETs and signal lines in industrial power supplies.
For engineers reviewing the SMAJ85-E3/61 datasheet, SMAJ85-E3/61 pinout, SMAJ85-E3/61 application, or SMAJ85-E3/61 equivalent, this page delivers verified electrical parameters, JEDEC-compliant thermal resistance (RθJA = 120 °C/W), RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and precise unidirectional polarity marking per J-STD-020.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector, activating when reverse voltage exceeds its 85 V stand-off threshold to divert surge energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive transients.
Rated for 150 °C maximum junction temperature and 40 A non-repetitive forward surge current (8.3 ms half-sine), it supports high-reliability deployment in automotive-grade environments when paired with HE3 suffix variants. The device meets UL 94 V-0 flammability and JESD201 Class 1A whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - maximum continuous reverse operating voltage before clamping initiates |
| VC (Clamping Voltage) | 151 V at 2.0 A IPPM - limits transient voltage seen by protected ICs during surge events |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs waveform) - defines energy-handling capability under standard lightning/surge test conditions |
| IPPM (Peak Pulse Current) | 2.0 A - peak current the device safely clamps without degradation |
| RθJA (Thermal Resistance) | 120 °C/W - determines junction temperature rise above ambient under steady-state power dissipation |
| TJ max. | 150 °C - maximum allowable junction temperature for reliable long-term operation |
| Package | DO-214AC (SMA) - surface-mount outline compatible with automated placement and reflow soldering |
Pinout & Package
DO-214AC (SMA) package with two terminals: cathode (marked with band) and anode. Designed for PCB mounting on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal to meet thermal and surge-current derating requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts during overvoltage to clamp voltage at VC |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity | Enables precise placement in DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded |
| Glass passivated junction | Ensures stable VBR tolerance (94.4–115 V) and long-term reliability under thermal cycling and humidity stress |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak without baking preconditioning |
| RoHS-compliant matte tin plating | Guarantees solderability per J-STD-002 and eliminates lead-based contamination risks in final assembly |
| 400 W peak pulse power | Provides sufficient margin against IEC 61000-4-5 Level 4 surges (4 kV line-earth) in industrial power inputs |
Applications
| Industrial Power Input Protection | Automotive Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp transients before they reach upstream DC-DC converters. Use Value: Limits voltage excursion to ≤151 V during 2.0 A surge, preventing damage to 36 V-rated input capacitors and controller ICs. |
Use Scenario: Shielding CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from ESD and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt protector on differential signal pairs or single-ended sensor outputs, referenced to local ground plane. Use Value: Clamps fast-rising transients (<1 ns rise time) within 1.0 ps response window, preserving signal integrity below 151 V. |
| Telecom AC/DC Adapter Interface | Consumer Equipment USB Port Protection |
|
Use Scenario: Safeguarding secondary-side rectifier outputs and feedback circuits in isolated AC/DC adapters used in telecom infrastructure. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor terminals to absorb flyback energy from transformer leakage inductance. Use Value: Absorbs 400 W peak pulse energy without thermal runaway, maintaining output regulation during repeated surge events. |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines and VBUS in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on VBUS line only, avoiding signal distortion on D+/D− lines. Use Value: Withstands 8 kV contact ESD per IEC 61000-4-2 while adding <1 pF parasitic capacitance to preserve 480 Mbps data integrity. |
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-E3/61 | Lower clamping voltage (137 V vs. 151 V) due to tighter VBR range (94.4–104 V); same VWM and PPPM | Better suited for systems with tighter voltage margins downstream of protected node | Select SMAJ85A-E3/61 when clamping headroom must be minimized without sacrificing surge rating |
| SMBJ85A-E3/52 | Same electrical specs but in larger DO-214AA (SMB) package; higher thermal mass and RθJA = 80 °C/W | Preferred for higher average power dissipation or less aggressive PCB copper area | Choose SMBJ85A-E3/52 when board layout allows larger footprint and thermal management requires lower junction rise |
Compared with SMAJ85-E3/61, SMAJ85A-E3/61 offers tighter clamping performance for margin-critical designs, while SMBJ85A-E3/52 trades compactness for enhanced thermal resilience - both require no schematic change but may need layout revision due to differing footprints.
Availability
SMAJ85-E3/61 is available at Aetrix Electronics and suitable for industrial power input protection, automotive sensor interface hardening, telecom adapter surge suppression, and consumer USB port hardening requiring stable component supply across multi-year production cycles.
Supply support for SMAJ85-E3/61 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The SMAJ series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments - balancing low profile, high power density, and JEDEC-compliant manufacturability.
FAQ
What is the maximum clamping voltage of SMAJ85-E3/61 under standard test conditions?
The SMAJ85-E3/61 has a maximum clamping voltage (VC) of 151 V when subjected to a 10/1000 µs waveform at 2.0 A peak pulse current (IPPM). This value is measured at TA = 25 °C with recommended 0.2 × 0.2 inch copper pads. The clamping performance remains stable across its -55 °C to +150 °C operating junction temperature range, making SMAJ85-E3/61 suitable for harsh-environment deployments where voltage overshoot must be tightly bounded.
Is SMAJ85-E3/61 unidirectional or bidirectional, and how is polarity identified?
SMAJ85-E3/61 is a unidirectional transient voltage suppressor, meaning it conducts only in reverse bias above its breakdown threshold. Polarity is indicated by a visible cathode band on the DO-214AC (SMA) package body - the banded end connects to the protected line, while the unbanded end connects to ground or reference potential. This configuration prevents forward conduction during normal operation, ensuring SMAJ85-E3/61 does not interfere with DC bias conditions in the protected circuit.
Does SMAJ85-E3/61 meet automotive qualification standards?
The base SMAJ85-E3/61 variant is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ85HE3/61 variant (with HE3 suffix), which undergoes additional stress testing per AEC-Q101 and is rated for high-reliability use in engine control units and ADAS modules. Engineers specifying SMAJ85-E3/61 for automotive should verify whether their design requires the extended qualification - SMAJ85-E3/61 itself is intended for industrial and telecom use cases where AEC-Q101 is not mandated.
What is the thermal resistance and how does it affect PCB layout for SMAJ85-E3/61?
SMAJ85-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal. This value assumes no internal layer copper or thermal vias; adding thermal relief or stitching vias can reduce RθJA by up to 30 %. Proper pad sizing is critical - undersized pads cause excessive junction heating during repetitive surges, potentially degrading SMAJ85-E3/61's clamping consistency over time.
Can SMAJ85-E3/61 be used in bidirectional signal line protection?
No - SMAJ85-E3/61 is strictly unidirectional and unsuitable for bidirectional signal lines such as RS-485 or CAN without external circuitry. For bidirectional protection, Vishay specifies CA-suffix variants like SMAJ85CA-E3/61, which exhibit symmetrical clamping in both polarities. Using SMAJ85-E3/61 on a bidirectional line would result in forward conduction during one half-cycle, disrupting signal integrity and risking device failure. Always match SMAJ85-E3/61's unidirectional behavior to DC-biased or ground-referenced protection points.
SMAJ85-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ85-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ85-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ85-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85-E3/61?
SMAJ85-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85-E3/61 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-E3/61?
For technical support, including SMAJ85-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85-E3/61 requirements.
6.How does Aetrix verify that SMAJ85-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ85-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ85-E3/61?
All SMAJ85-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ85-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85-E3/61 Tags
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