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Vishay General Semiconductor - Diodes Division SMAJ8.0CAHE3_A/I
- Part No.:
- SMAJ8.0CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CAHE3_A/I.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,925
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Product details
Overview
SMAJ8.0CAHE3_A/I 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 8.0 V stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 10 mA test current, 13.6 V maximum clamping voltage (VC) at 29.4 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ8.0CAHE3_A/I datasheet, SMAJ8.0CAHE3_A/I pinout, SMAJ8.0CAHE3_A/I application, or SMAJ8.0CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.53), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but conducts heavily when transient voltage exceeds VBR, limiting downstream voltage to ≤13.6 V. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the bidirectional architecture eliminates polarity concerns in AC-coupled or floating lines.
The SMAJ8.0CAHE3_A/I is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - requiring careful PCB copper pad design (minimum 0.2" × 0.2" per terminal) to sustain surge energy without junction overheating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - maximum continuous reverse operating voltage before significant leakage; defines safe signal swing range. |
| VBR (min/max) | 8.89 V / 9.83 V at 10 mA - guaranteed breakdown onset window; determines earliest clamping activation threshold. |
| VC @ IPPM | 13.6 V at 29.4 A - worst-case clamped voltage during 10/1000 μs surge; must be below protected IC's absolute max rating. |
| PPPM | 400 W - peak transient power absorption capacity; validates protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 50 μA max - reverse leakage at stand-off voltage; ensures minimal signal distortion or power loss in active circuits. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments. |
| MSL Level | Level 1 (per J-STD-020) - no floor life limitation; compatible with standard reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both terminals identical) | Transient conduction path | Either terminal serves as input/output; bidirectional clamping enables use on AC lines or ungrounded interfaces without orientation check. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; copper pad area directly impacts thermal dissipation and surge endurance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - supports deployment in engine control, ADAS, and infotainment modules. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 combination wave surges up to ±4 kV (open-circuit)/±2 kV (short-circuit) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.53) | Minimizes overvoltage stress on downstream components - critical for protecting 3.3 V or 5 V logic interfaces. |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime; reduces parameter drift vs. epoxy-passivated alternatives. |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102; supports lead-free reflow and avoids whisker growth (JESD 201 Class 2). |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump and jump-start transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, responding within <1 ns to suppress spikes exceeding 8.0 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V automotive MCUs by limiting transient voltage to ≤13.6 V - validated per ISO 7637-2 Pulse 5a. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC analog input modules from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) shunt protector across differential signal pair, maintaining signal integrity up to 1 MHz. Use Value: Enables reliable 16-bit ADC measurements by suppressing >8 kV contact ESD events (IEC 61000-4-2) without introducing offset or gain error. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Safeguarding USB 2.0 D+/D− lines in smart home hubs against human-body-model ESD events during plug/unplug cycles. IC Role / Device Role / Timing Role: Bidirectional TVS placed inline with data lines, leveraging symmetric clamping to handle both positive and negative transients equally. Use Value: Maintains USB full-speed signaling integrity (480 Mbps) with <1 pF parasitic capacitance impact - verified via TDR and eye-diagram testing. |
Use Scenario: Front-end protection of ADSL/VDSL line drivers against lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary surge limiter mounted at line interface connector, absorbing multi-kA impulses before they reach transformer-coupled PHY circuitry. Use Value: Extends service life of line driver ICs by diverting >10 A 10/1000 μs surges away from sensitive CMOS inputs - compliant with ITU-T K.20/K.21. |
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-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for consumer/industrial designs not requiring AEC-Q101 traceability. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle assurance. |
| SMCJ8.0CAHE3_A/I | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating. | Higher surge handling supports harsher environments (e.g., railway, grid infrastructure); requires larger PCB footprint. | Choose when system-level surge tests exceed 400 W - e.g., IEC 61000-4-5 Level 5 - and board space permits SMC layout. |
Compared with SMAJ8.0CAHE3_A/I, SMAJ8.0CA-E3/61 offers identical protection performance without automotive qualification, while SMCJ8.0CAHE3_A/I trades smaller size for 3.75× higher surge power - enabling robustness upgrades without redesigning clamping topology.
Availability
SMAJ8.0CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog I/O modules, consumer USB host ports, and telecom DSL line cards requiring stable component supply with AEC-Q101 traceability and long-term production continuity.
Supply support for SMAJ8.0CAHE3_A/I 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 application-specific optimization.
The SMAJ series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and communications equipment - delivering standardized TVS performance in compact, AEC-Q101-qualified surface-mount packages.
FAQ
What is the clamping voltage of SMAJ8.0CAHE3_A/I at its rated peak pulse current?
The SMAJ8.0CAHE3_A/I has a maximum clamping voltage (VC) of 13.6 V when subjected to its specified peak pulse current (IPPM) of 29.4 A with a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that downstream circuitry will not experience voltages exceeding 13.6 V during such transient events - a critical parameter for ensuring compatibility with 3.3 V or 5 V logic interfaces. The SMAJ8.0CAHE3_A/I achieves this with a clamping ratio of approximately 1.53 (VC/VBR), reflecting efficient voltage limiting behavior.
Is SMAJ8.0CAHE3_A/I suitable for automotive applications?
Yes, SMAJ8.0CAHE3_A/I is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature operating life, temperature cycling, and ESD immunity required for automotive electronic components. Its operating junction temperature range of −55 °C to +150 °C supports under-hood and cabin-mounted applications, and the HE3 suffix explicitly denotes AEC-Q101 compliance. The SMAJ8.0CAHE3_A/I is commonly deployed in LIN bus nodes, body control modules, and sensor interfaces where transient immunity and long-term reliability are mandatory.
How does the bidirectional configuration of SMAJ8.0CAHE3_A/I affect its usage compared to unidirectional variants?
The "CA" suffix in SMAJ8.0CAHE3_A/I indicates bidirectional construction, meaning it clamps voltage transients of either polarity symmetrically - unlike unidirectional "A" versions that only conduct in reverse bias. This eliminates the need for polarity-aware placement on AC-coupled lines, differential pairs, or floating grounds. For example, in USB D+/D− or RS-485 bus protection, SMAJ8.0CAHE3_A/I simplifies layout and prevents misorientation failures. Its VBR and VC values apply identically for both polarities, ensuring consistent protection regardless of transient direction.
What is the thermal resistance and how does it impact PCB layout for SMAJ8.0CAHE3_A/I?
The SMAJ8.0CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To sustain its 400 W peak pulse rating, Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - insufficient copper area causes excessive junction temperature rise during surge events, risking parametric shift or failure. The SMAJ8.0CAHE3_A/I's thermal performance is thus highly dependent on PCB copper mass and layer stack-up, not just package size.
Does SMAJ8.0CAHE3_A/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ8.0CAHE3_A/I meets MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can withstand peak reflow temperatures up to 260 °C without baking or special handling. This is confirmed in the Vishay datasheet revision 09-Jan-2024 (Document Number: 88390). The device's matte tin-plated leads also comply with J-STD-002 and JESD 22-B102 for solderability, making SMAJ8.0CAHE3_A/I fully compatible with standard lead-free SMT assembly processes used in high-reliability manufacturing.
SMAJ8.0CAHE3_A/I 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):
- 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_A/I FAQ
1.How can I place an order for SMAJ8.0CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CAHE3_A/I 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_A/I reliable?
The price and inventory of SMAJ8.0CAHE3_A/I 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_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CAHE3_A/I?
SMAJ8.0CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CAHE3_A/I 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_A/I?
For technical support, including SMAJ8.0CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ8.0CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CAHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CAHE3_A/I?
All SMAJ8.0CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CAHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMAJ8.0CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.0CAHE3_A/I Tags
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