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Vishay General Semiconductor - Diodes Division SMAJ8.5C-E3/61
- Part No.:
- SMAJ8.5C-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5C-E3/61.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ8.5C-E3/61 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients on signal/power lines. It features 8.5 V stand-off voltage (VWM), 15.9 V maximum clamping voltage (VC) at 25.2 A peak pulse current (IPPM), 400 W peak pulse power (10/1000 µs), and operates from −55 °C to +150 °C - used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ8.5C-E3/61 datasheet, SMAJ8.5C-E3/61 pinout, SMAJ8.5C-E3/61 application, or SMAJ8.5C-E3/61 equivalent, key selection criteria include bi-directional clamping capability, low VC/VWM ratio (1.87), RoHS-compliant matte tin terminals, MSL Level 1 rating, and compatibility with automated SMT placement on 5.0 × 5.0 mm copper pads.
Technical Context
This bi-directional TVS diode uses a glass-passivated silicon junction to achieve fast response (<1 ps) and low incremental surge resistance. Its symmetrical breakdown behavior ensures identical clamping in both polarities, with VBR min/max of 9.44 V / 11.5 V at 1.0 mA test current.
Thermal performance is defined by RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), supporting operation up to TJ = 150 °C. The device meets J-STD-020 MSL Level 1 and withstands solder dip at 260 °C for 40 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before conduction begins |
| VC @ IPPM | 15.9 V at 25.2 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling per 10/1000 µs waveform on specified PCB pad layout |
| IPPM | 25.2 A - maximum non-repetitive surge current the device safely clamps without failure |
| VBR (min/max) | 9.44 V / 11.5 V at 1.0 mA - verified breakdown threshold range under standardized test conditions |
| ID @ VWM | 10 µA - low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ Range | −55 °C to +150 °C - supports under-hood automotive and industrial ambient environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bi-directional configuration with no polarity marking - symmetric terminal design for AC-coupled or floating lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Both terminals function identically; no cathode band - enables placement without orientation check |
| Case (body) | Thermal and mechanical interface | Plastic-molded body meets UL 94 V-0; thermal path routed via leads to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Identical VBR, VC, and IPPM in both directions - eliminates polarity concerns in AC or differential signal paths |
| 400 W peak pulse rating | Validated with 10/1000 µs waveform on 5.0 × 5.0 mm copper pads - matches IEC 61000-4-5 Level 4 surge immunity requirements |
| MSL Level 1 compliance | Rated for unlimited floor life at ≤30 °C/60% RH - supports standard SMT assembly without dry pack or baking |
| Glass-passivated junction | Stable VBR and low leakage over temperature and lifetime - critical for long-term reliability in automotive ECUs |
| RoHS & WEEE compliant | E3 suffix denotes lead-free matte tin plating per JESD22-B102 and JESD201 Class 1A whisker resistance - suitable for commercial and industrial use |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle cabins. IC Role / Device Role: Bi-directional TVS placed directly at connector entry point to shunt transients before reaching ASIC input pins. Use Value: Clamps 15.9 V at 25.2 A, ensuring downstream ICs see <16 V stress - well below typical 18–24 V absolute max ratings. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring surges and ground-loop transients in factory automation. IC Role / Device Role: Primary surge clamp on 24 V DC input lines, mounted adjacent to terminal block with minimum trace length. Use Value: 400 W rating handles repetitive 10/1000 µs surges per IEC 61000-4-4; low VC/VWM ratio minimizes voltage overshoot during clamping. |
| Consumer USB Port ESD Protection | Telecom Line Interface |
|
Use Scenario: Adding secondary-level ESD robustness to USB 2.0 data lines (D+/D−) in set-top boxes and smart displays. IC Role / Device Role: Bi-directional TVS placed after common-mode choke to absorb ±15 kV contact discharge per IEC 61000-4-2. Use Value: 10 µA leakage at 8.5 V preserves signal integrity; sub-1 ps response prevents ESD energy coupling into PHY. |
Use Scenario: Protecting RS-485 transceiver inputs in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role: First-stage transient suppressor on twisted-pair lines, paired with GDT or MOV for staged protection. Use Value: Symmetrical clamping maintains differential mode integrity; DO-214AC footprint allows compact dual-line layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CA-E3/61 | Same electrical specs and DO-214AC package; CA suffix explicitly denotes bi-directional version per Vishay ordering nomenclature | No functional difference - CA and C suffixes both indicate bi-directional configuration in this family | Select SMAJ8.5CA-E3/61 when strict alignment with Vishay's documented bi-directional part numbering convention is required for BOM control |
| SMBJ8.5C-E3/52 | DO-214AA (SMB) package, 600 W PPPM, same VWM/VC but higher IPPM (35.5 A); larger footprint and thermal mass | Better suited for higher-energy surges where board space permits; not drop-in due to different pad layout and height | Choose SMBJ8.5C-E3/52 only if system-level testing confirms need for >400 W clamping margin and PCB layout accommodates SMB outline |
Compared with SMAJ8.5C-E3/61, SMAJ8.5CA-E3/61 offers identical protection performance with explicit bi-directional labeling, while SMBJ8.5C-E3/52 provides higher surge capacity in a larger package - neither is pin-compatible, but both serve overlapping transient suppression roles with distinct layout and rating trade-offs.
Availability
SMAJ8.5C-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and consumer USB port ESD protection requiring stable component supply and full traceability.
Supply support for SMAJ8.5C-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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series was developed for robust, surface-mount transient suppression in automotive, industrial, and telecom systems - prioritizing low clamping voltage, repeatable surge handling, and automated assembly compatibility.
FAQ
What does the "C" suffix mean in SMAJ8.5C-E3/61?
The "C" suffix in SMAJ8.5C-E3/61 indicates a bi-directional configuration, meaning the device provides symmetrical transient suppression in both polarities. This is confirmed in Vishay's documentation: "For bi-directional use C or CA suffix (e.g. SMAJ10C, SMAJ10CA)" and electrical characteristics apply identically in either direction. SMAJ8.5C-E3/61 has no polarity marking and requires no orientation during placement.
Is SMAJ8.5C-E3/61 RoHS compliant and qualified for automotive use?
SMAJ8.5C-E3/61 carries the E3 suffix, certifying RoHS 2002/95/EC compliance and matte tin plating per JESD22-B102 and JESD201 Class 1A whisker testing. However, it is rated for commercial grade - not AEC-Q101. For automotive qualification, Vishay specifies the HE3 suffix (e.g., SMAJ8.5CHE3/61), which undergoes additional stress testing and screening.
What is the maximum clamping voltage of SMAJ8.5C-E3/61 and under what test condition?
The maximum clamping voltage (VC) of SMAJ8.5C-E3/61 is 15.9 V, measured at a peak pulse current (IPPM) of 25.2 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed per Vishay Document Number 88390, page 2, and assumes mounting on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per JEDEC standards.
Can SMAJ8.5C-E3/61 be used in place of a unidirectional TVS like SMAJ8.5A-E3/61?
No - SMAJ8.5C-E3/61 is bi-directional and lacks polarity marking, while SMAJ8.5A-E3/61 is unidirectional with a cathode band. Substituting them risks incorrect circuit behavior: SMAJ8.5C-E3/61 will conduct on both polarities, potentially shorting DC bias rails or distorting AC signals. Always match device directionality to circuit topology; SMAJ8.5C-E3/61 is only suitable where symmetrical clamping is required.
What is the thermal resistance and maximum junction temperature for SMAJ8.5C-E3/61?
SMAJ8.5C-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, per Vishay Document Number 88390, page 4. Its maximum operating junction temperature (TJ) is +150 °C, with storage range from −55 °C to +150 °C - enabling use in under-hood automotive and high-temperature industrial environments when properly heatsinked via PCB copper.
SMAJ8.5C-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 25.2A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ8.5C-E3/61 FAQ
1.How can I place an order for SMAJ8.5C-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5C-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 SMAJ8.5C-E3/61 reliable?
The price and inventory of SMAJ8.5C-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 SMAJ8.5C-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5C-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5C-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5C-E3/61?
SMAJ8.5C-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5C-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 SMAJ8.5C-E3/61?
For technical support, including SMAJ8.5C-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5C-E3/61 requirements.
6.How does Aetrix verify that SMAJ8.5C-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5C-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 SMAJ8.5C-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5C-E3/61?
All SMAJ8.5C-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5C-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 SMAJ8.5C-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ8.5C-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5C-E3/61 Tags
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