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Vishay General Semiconductor - Diodes Division SMAJ8.5CAHE3/61
- Part No.:
- SMAJ8.5CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CAHE3/61.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,100
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Product details
Overview
SMAJ8.5CAHE3/61 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 or power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤14.4 V at 27.8 A peak pulse current (IPPM) under 10/1000 μs waveform - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the SMAJ8.5CAHE3/61 datasheet, SMAJ8.5CAHE3/61 pinout, SMAJ8.5CAHE3/61 application, or SMAJ8.5CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 400 W peak pulse power rating, low clamping ratio (VC/VBR ≈ 1.45), and compatibility with automated SMT assembly on standard PCB pads.
Technical Context
This TVS diode operates as a voltage-clamping device across two terminals, responding to transient overvoltages in either polarity due to its symmetrical bidirectional structure. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping performance under repetitive 10/1000 μs surges at 0.01% duty cycle.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on 0.2" × 0.2" copper pads. Its MSL Level 1 rating (per J-STD-020) and matte tin-plated leads ensure robust reflow solderability without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 9 V nominal supply rails. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - verified breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 14.4 V at 27.8 A - clamping voltage limits downstream IC stress during 400 W surge events. |
| PPPM | 400 W (10/1000 μs) - peak pulse power handling capacity suitable for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | 10 μA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits. |
| TJ max | +150 °C - supports operation in under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode/anode terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides low-impedance path to ground or rail during positive or negative voltage excursions; no fixed polarity. |
| Cathode | Transient return path (bidirectional) | Functionally identical to Anode in CA-type devices; both terminals serve as symmetrical clamping nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485, sensor bridges) without polarity constraints. |
| 400 W peak pulse power | Withstands high-energy transients such as load dump spikes and inductive switching surges common in 12 V automotive systems. |
| AEC-Q101 qualification | Validates long-term reliability for automotive applications including engine control modules, ADAS sensors, and body electronics. |
| MSL Level 1 | Allows unlimited floor life and standard reflow profiles (peak 260 °C), eliminating bake requirements and simplifying SMT line integration. |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, with minimal parameter drift versus silicon-based alternatives. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to ISO 7637-2 Pulse 5a load dump. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤14.4 V, preventing ADC saturation and latch-up while maintaining <10 μA leakage at 8.5 V nominal bias. |
Use Scenario: Safeguarding 24 V PLC digital input channels against field-wiring induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary front-end transient suppressor mounted directly at connector entry point. Use Value: Clamps 400 W surges within nanoseconds, preserving input conditioning circuitry and enabling compliance with industrial immunity standards. |
| Consumer USB Port Protection | Telecom Line Interface |
Use Scenario: Shielding USB 2.0 D+/D− lines in portable medical devices from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to USB connector. Use Value: Delivers sub-1 ns response and <10 μA leakage to avoid signal distortion while meeting IEC 61000-4-2 ±15 kV contact discharge requirements. |
Use Scenario: Protecting Ethernet PHY differential pairs and telephone line interfaces in VoIP gateways against lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after gas discharge tube (GDT) primary protection. Use Value: Provides precise clamping at 14.4 V to prevent damage to sensitive PHY ICs while supporting high-speed data integrity. |
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-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulation. | Choose SMAJ8.5CAHE3/61 for standard AEC-Q101 automotive use; choose SMAJ8.5CA-M3/61 only if halogen-free content is contractually required. |
| SMBJ8.5CAHE3/61 | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package with higher 600 W PPPM rating and 30 °C/W lower RθJA. | Better thermal performance and surge margin; requires larger PCB footprint and may not fit space-constrained layouts. | Select SMBJ8.5CAHE3/61 when higher surge endurance or improved thermal dissipation is needed; retain SMAJ8.5CAHE3/61 for compact designs with 400 W surge requirement. |
Compared with SMAJ8.5CA-M3/61, the HE3 suffix confirms identical AEC-Q101 qualification and performance but differs in plating chemistry; compared with SMBJ8.5CAHE3/61, SMAJ8.5CAHE3/61 trades 200 W pulse power and thermal margin for 30% smaller board area - critical for dense automotive ECUs and portable electronics.
Availability
SMAJ8.5CAHE3/61 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, consumer USB peripherals, and telecom line interface designs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ8.5CAHE3/61 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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and communications systems where compact size, fast response, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ8.5CAHE3/61 at its rated peak pulse current?
The SMAJ8.5CAHE3/61 clamps to a maximum of 14.4 V at its rated peak pulse current of 27.8 A under the standardized 10/1000 μs waveform. This VC value is measured at the device terminals and represents the upper voltage limit imposed on protected circuitry during surge events, ensuring downstream components remain within safe operating voltage windows.
Is SMAJ8.5CAHE3/61 suitable for automotive applications?
Yes, SMAJ8.5CAHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets stringent reliability requirements including temperature cycling, high-temperature reverse bias, and ESD testing - making it appropriate for engine control units, ADAS camera modules, and body electronics where transient immunity is critical.
How does the bidirectional configuration of SMAJ8.5CAHE3/61 affect its placement in circuit design?
The bidirectional configuration of SMAJ8.5CAHE3/61 eliminates polarity constraints: it can be placed across any two points needing symmetrical overvoltage protection - such as differential signal pairs (CAN, RS-485) or AC-coupled lines - without regard to anode/cathode orientation. No band marking is present, simplifying layout and reducing assembly errors.
What is the maximum steady-state power dissipation of SMAJ8.5CAHE3/61?
The SMAJ8.5CAHE3/61 has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. In practical PCB layouts using 0.2" × 0.2" copper pads per terminal, derating applies - typical usable continuous power is ~0.5–0.8 W depending on ambient temperature and airflow, sufficient for leakage-limited standby conditions but not for sustained forward conduction.
Does SMAJ8.5CAHE3/61 require special handling during PCB assembly?
No, SMAJ8.5CAHE3/61 is rated MSL Level 1 per J-STD-020 and supports standard lead-free reflow profiles with peak temperatures up to 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, and whisker resistance meets JESD 201 Class 2 - enabling direct placement into high-volume SMT lines without baking or special storage protocols.
SMAJ8.5CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ8.5CAHE3/61 FAQ
1.How can I place an order for SMAJ8.5CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CAHE3/61 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 SMAJ8.5CAHE3/61 reliable?
The price and inventory of SMAJ8.5CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CAHE3/61?
SMAJ8.5CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CAHE3/61 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 SMAJ8.5CAHE3/61?
For technical support, including SMAJ8.5CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ8.5CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CAHE3/61 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 SMAJ8.5CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CAHE3/61?
All SMAJ8.5CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CAHE3/61, 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 SMAJ8.5CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ8.5CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5CAHE3/61 Tags
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