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Vishay General Semiconductor - Diodes Division SMAJ8.5CA-E3/61
- Part No.:
- SMAJ8.5CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CA-E3/61.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,064
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Product details
Overview
SMAJ8.5CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ8.5CA-E3/61 datasheet, SMAJ8.5CA-E3/61 pinout, SMAJ8.5CA-E3/61 application, or SMAJ8.5CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), AEC-Q101 qualification eligibility (via HE3 suffix), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<10 μA at VWM), while the low incremental surge resistance enables rapid energy dissipation during ESD or lightning-induced surges.
The device complies with ANSI/IEEE C62.35 standards and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance. Thermal resistance is characterized at RθJA = 120 °C/W and RθJL = 30 °C/W, supporting reliable operation up to TJ = +150 °C in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse stand-off voltage before significant leakage; defines safe operating margin below breakdown. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - guaranteed breakdown window ensuring predictable clamping onset across production lots. |
| VC @ IPPM | 14.4 V at 27.8 A - clamping voltage under 10/1000 μs surge; determines protected circuit's maximum transient exposure level. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; supports robust protection against IEC 61000-4-5 surges. |
| ID @ VWM | <10 μA - ultra-low reverse leakage at rated stand-off voltage, minimizing standby power loss in battery-powered systems. |
| TJ max. | +150 °C - maximum junction temperature enabling use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height for high-density layout. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Accepts surge current during positive polarity events; symmetrical with cathode for bidirectional operation. |
| Cathode | Transient current entry (negative half-cycle) | Accepts surge current during negative polarity events; functionally identical to anode in SMAJ8.5CA-E3/61. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware placement in AC-coupled or floating signal paths. |
| 400 W peak pulse power | Rated per 10/1000 μs waveform - provides immunity to severe transients including ISO 7637-2 Pulse 5a and IEC 61000-4-5 Level 4 surges. |
| Low clamping ratio (VC/VBR) | ≈1.45 - tight voltage control minimizes stress on downstream ICs while maintaining sufficient margin above VWM. |
| AEC-Q101 qualification path | Available via HE3/HM3 suffix variants - supports automotive-grade reliability validation for engine control, ADAS, and body electronics. |
| MSL Level 1 moisture sensitivity | Reflow-compatible at 260 °C peak - enables standard lead-free assembly without baking or special handling. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Safeguarding CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) against load dump and inductive switching spikes in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt transients before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers and ADC front-ends by limiting transient excursions to ≤14.4 V. |
Use Scenario: Protecting digital input modules in programmable logic controllers from field-wiring induced surges during maintenance or cable coupling events. IC Role / Device Role / Timing Role: Primary overvoltage suppression element on 24 V DC input channels, mounted adjacent to terminal block entry points. Use Value: Maintains functional safety integrity by clamping fast-rising transients (tR < 1 ns) within 1.5 ns response time, preserving signal fidelity. |
| Consumer USB Port ESD Protection | Telecom Line Interface Protection |
|
Use Scenario: Secondary-level ESD protection for USB 2.0 data lines (D+/D−) in set-top boxes and smart displays exposed to human-body model (HBM) discharges. IC Role / Device Role / Timing Role: Low-capacitance TVS placed after primary polymer-based surge suppressors to handle residual fast transients. Use Value: Limits clamping voltage to 14.4 V while adding only ~15 pF junction capacitance - avoids signal integrity degradation at 480 Mbps. |
Use Scenario: Protecting Ethernet PHY interfaces and RS-485 transceivers in network edge devices subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Bidirectional transient suppressor bridging differential pairs to ground, configured as line-to-line and line-to-ground. Use Value: Withstands repetitive 400 W pulses at 0.01 % duty cycle - sustains long-term reliability in outdoor telecom cabinets without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-E3/61 | Unidirectional variant with cathode band marking; same VWM, VBR, VC, and PPPM ratings. | Requires polarity-aware PCB layout; unsuitable for AC or floating differential signals. | Select when protecting DC-biased single-ended lines where reverse conduction must be blocked. |
| SMBJ8.5CA-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 600 W PPPM rating (vs. 400 W); RθJA = 80 °C/W. | Higher power handling and better thermal dissipation; requires 2.5× more board area than SMA. | Choose for higher-reliability industrial designs needing extended surge endurance or elevated ambient temperatures. |
Compared with SMAJ8.5A-E3/61, the unidirectional version demands strict polarity alignment and cannot protect bidirectional signals; compared with SMBJ8.5CA-E3/52, the SMAJ8.5CA-E3/61 trades 50 % lower surge rating for 40 % smaller footprint and full compatibility with fine-pitch SMT processes.
Availability
SMAJ8.5CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB port hardening, and telecom line interface protection requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMAJ8.5CA-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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-volume surface-mount transient protection in space-constrained, high-reliability applications across automotive, industrial, and communications markets - balancing clamping performance, thermal robustness, and manufacturability.
FAQ
What is the clamping voltage of SMAJ8.5CA-E3/61 under a 10/1000 μs surge?
The SMAJ8.5CA-E3/61 exhibits a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 27.8 A using the standardized 10/1000 μs double-exponential waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry will not experience voltages exceeding 14.4 V during such transient events, making SMAJ8.5CA-E3/61 suitable for protecting 5 V and 3.3 V logic interfaces.
Is SMAJ8.5CA-E3/61 suitable for automotive applications?
SMAJ8.5CA-E3/61 itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ8.5CAHE3_A). The base SMAJ8.5CA-E3/61 shares identical electrical characteristics and thermal performance, and its DO-214AC package meets MSL Level 1 - enabling drop-in qualification testing. For production automotive use, specify the HE3 variant to ensure certified reliability.
How does the bidirectional design of SMAJ8.5CA-E3/61 affect PCB layout?
The SMAJ8.5CA-E3/61 has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional variants (e.g., SMAJ8.5A-E3/61), it requires no cathode band alignment - simplifying automated optical inspection and reducing assembly errors in differential or AC-coupled signal paths. This symmetry makes SMAJ8.5CA-E3/61 ideal for protecting USB D+/D−, RS-485, and CAN bus lines without directional routing concerns.
What is the maximum operating temperature for SMAJ8.5CA-E3/61?
The SMAJ8.5CA-E3/61 has a specified operating junction temperature range of –55 °C to +150 °C. Its thermal resistance values (RθJA = 120 °C/W, RθJL = 30 °C/W) allow sustained operation at full 400 W pulse rating only when mounted on the recommended 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads. At ambient temperatures above 75 °C, derating per Figure 2 in the datasheet applies to maintain TJ ≤ 150 °C - confirming SMAJ8.5CA-E3/61's suitability for under-hood and industrial enclosure deployments.
Does SMAJ8.5CA-E3/61 meet RoHS and halogen-free requirements?
Yes, the "E3" suffix in SMAJ8.5CA-E3/61 denotes RoHS-compliant construction with matte tin-plated leads and UL 94 V-0 molding compound. It is not halogen-free by default; for halogen-free compliance, select the "M3" variant (SMAJ8.5CA-M3/61), which maintains identical electrical performance while meeting JEDEC JS709E and IPC-4101D standards for bromine and chlorine content.
SMAJ8.5CA-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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)
SMAJ8.5CA-E3/61 FAQ
1.How can I place an order for SMAJ8.5CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CA-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 SMAJ8.5CA-E3/61 reliable?
The price and inventory of SMAJ8.5CA-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 SMAJ8.5CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CA-E3/61?
SMAJ8.5CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CA-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 SMAJ8.5CA-E3/61?
For technical support, including SMAJ8.5CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ8.5CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CA-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 SMAJ8.5CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CA-E3/61?
All SMAJ8.5CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CA-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 SMAJ8.5CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ8.5CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5CA-E3/61 Tags
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