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Vishay General Semiconductor - Diodes Division SMAJ8.0CAHE3/5A
- Part No.:
- SMAJ8.0CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CAHE3/5A.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,630
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Product details
Overview
SMAJ8.0CAHE3/5A 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 8.0 V stand-off voltage (VWM), 13.6 V maximum clamping voltage (VC) at 29.4 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ8.0CAHE3/5A datasheet, SMAJ8.0CAHE3/5A pinout, SMAJ8.0CAHE3/5A application, or SMAJ8.0CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.7), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the low incremental surge resistance supports effective energy diversion during ESD or lightning-induced transients.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Fig. 2 in the datasheet. With 120 °C/W junction-to-ambient thermal resistance (RθJA) on standard PCB pads, thermal management relies on adequate copper area rather than external heatsinking - consistent with its 3.3 W steady-state power dissipation (PD) rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected circuitry. |
| VBR (min/max) | 8.89 V / 9.83 V at 1.0 mA - Verified breakdown threshold range; ensures reliable triggering within specified tolerance under test conditions. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs like microcontrollers or transceivers. |
| PPPM | 400 W - Peak transient power handling capacity; enables robust protection against IEC 61000-4-5 Level 3 surges (e.g., 1 kV/42 Ω). |
| ID @ VWM | 50 μA - Reverse leakage at stand-off voltage; low enough to avoid loading sensitive analog or high-impedance sensor inputs. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with JEDEC MS-013AC footprint. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking for bidirectional types; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as identical surge current entry/exit points; no functional distinction - essential for protecting balanced lines or AC signals. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS sensor, and infotainment module designs. |
| 400 W peak pulse power | Handles repetitive 10/1000 μs transients at 0.01% duty cycle - sufficient for industrial motor drive switching noise and telecom line surges. |
| Clamping ratio VC/VWM = 1.7 | Low overvoltage margin ensures protected ICs remain within absolute maximum ratings during clamping - critical for 3.3 V or 5 V logic interfaces. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking - eliminates pre-conditioning steps in high-volume SMT assembly. |
| Glass passivated junction | Enhances long-term stability of breakdown voltage and leakage current across temperature and lifetime - improves field failure rate predictability. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface to shunt surge energy before reaching transceiver IC. Use Value: Maintains signal integrity during 12 V/24 V system transients by limiting voltage to ≤13.6 V - preventing latch-up or gate oxide damage in protected ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, coordinated with series impedance to limit current into optocoupler input stages. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity requirements without adding active circuitry or complex filtering. |
| Telecom Line Interface | Consumer USB/DisplayPort ESD Protection |
Use Scenario: Shielding RS-485/RS-422 differential data lines in base station equipment and network switches from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired bidirectional TVS devices across differential pairs to suppress mode conversion and maintain common-mode rejection. Use Value: Achieves >20 kV contact ESD (IEC 61000-4-2) and 4 kV surge (IEC 61000-4-5) immunity while preserving signal rise/fall times due to low junction capacitance (~300 pF at 0 V). |
Use Scenario: Adding secondary-level surge protection on USB 2.0 or DisplayPort auxiliary channels in laptops and docking stations. IC Role / Device Role / Timing Role: Standby clamping device placed after primary ESD array to handle higher-energy events beyond ESD diode limits. Use Value: Extends system-level surge withstand capability from ±8 kV (IEC 61000-4-2) to ±1 kV (IEC 61000-4-5) without degrading high-speed signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0CA-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMA package and pinout. | No difference in protection performance or layout - selected when halogen-free material compliance is mandated by OEM environmental policy. | Choose SMAJ8.0CA-M3/5A if halogen-free bill-of-materials is required; otherwise SMAJ8.0CAHE3/5A offers full automotive qualification with standard RoHS compliance. |
| SMCJ8.0CAHE3/5A | Higher 1500 W PPPM rating in larger SMC (DO-214AB) package; same VWM, VC, and bidirectional functionality. | Used where higher surge energy (e.g., IEC 61000-4-5 Level 4) must be absorbed; requires larger PCB footprint and different pad layout. | Select SMCJ8.0CAHE3/5A only when 400 W is insufficient - SMAJ8.0CAHE3/5A remains optimal for space-constrained, cost-sensitive, or automotive interior applications. |
Compared with SMAJ8.0CA-M3/5A, the SMAJ8.0CAHE3/5A provides identical surge protection performance with standard RoHS compliance, while SMCJ8.0CAHE3/5A trades compact size for 3.75× higher pulse power - making SMAJ8.0CAHE3/5A the preferred choice for AEC-Q101–required, space-limited board designs.
Availability
SMAJ8.0CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, AEC-Q101 traceability, and long-term production continuity.
Supply support for SMAJ8.0CAHE3/5A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance across temperature, lifetime, and manufacturing lots.
FAQ
What does the "CA" suffix indicate in SMAJ8.0CAHE3/5A?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ8.0CAHE3/5A clamps voltage transients equally in both polarities - unlike unidirectional "A" variants that conduct only in reverse bias. This makes SMAJ8.0CAHE3/5A ideal for protecting AC-coupled signals, differential buses, or circuits where polarity cannot be guaranteed.
Is SMAJ8.0CAHE3/5A suitable for IEC 61000-4-5 surge testing?
Yes, SMAJ8.0CAHE3/5A is rated for 400 W peak pulse power with a 10/1000 μs waveform - sufficient to meet IEC 61000-4-5 Level 3 (1 kV line-to-ground, 2 kV line-to-line) when used with appropriate series impedance. Its 13.6 V clamping voltage at 29.4 A ensures protected ICs remain within safe operating limits during standardized surge events.
How does the HE3 suffix affect the qualification status of SMAJ8.0CAHE3/5A?
The "HE3" suffix indicates SMAJ8.0CAHE3/5A is RoHS-compliant and AEC-Q101 qualified - verified for automotive applications including temperature cycling, highly accelerated life testing (HALT), and ESD robustness. This distinguishes it from commercial-grade "E3" variants and confirms suitability for under-hood and safety-critical subsystems.
What is the thermal resistance of SMAJ8.0CAHE3/5A, and how does it impact PCB layout?
SMAJ8.0CAHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures during repetitive surges, designers must allocate minimum recommended pad area and avoid excessive trace length or isolation - no additional heatsinking is required for single-event protection.
Can SMAJ8.0CAHE3/5A replace SMAJ8.0AHE3/5A in a design?
No - SMAJ8.0CAHE3/5A is bidirectional while SMAJ8.0AHE3/5A is unidirectional, with cathode marking and forward conduction capability. Substituting them without circuit review risks unintended forward conduction, increased leakage, or failure to clamp positive transients. Always verify polarity requirements and clamping symmetry before interchange.
SMAJ8.0CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- 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)
SMAJ8.0CAHE3/5A FAQ
1.How can I place an order for SMAJ8.0CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CAHE3/5A 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 SMAJ8.0CAHE3/5A reliable?
The price and inventory of SMAJ8.0CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CAHE3/5A?
SMAJ8.0CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CAHE3/5A 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 SMAJ8.0CAHE3/5A?
For technical support, including SMAJ8.0CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ8.0CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CAHE3/5A 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 SMAJ8.0CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CAHE3/5A?
All SMAJ8.0CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CAHE3/5A, 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 SMAJ8.0CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.0CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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