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Vishay General Semiconductor - Diodes Division SMAJ8.0CAHM3_A/I
- Part No.:
- SMAJ8.0CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CAHM3_A/I.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ8.0CAHM3_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 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ8.0CAHM3_A/I datasheet, SMAJ8.0CAHM3_A/I pinout, SMAJ8.0CAHM3_A/I application, or SMAJ8.0CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, critical for suppressing ESD and inductive switching spikes.
The SMAJ8.0CAHM3_A/I is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 5 V–8 V logic/sensor rails. |
| VBR min/max | 8.89 V / 9.83 V at 1 mA - verified breakdown threshold ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 13.6 V at 29.4 A - clamping voltage under 10/1000 μs surge; limits downstream voltage stress to <14 V during transient suppression. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; supports robust protection against IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | 50 μA - ultra-low reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +150 °C - extended junction temperature rating enables use in under-hood automotive and industrial environments without derating. |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band not marked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 | One side of symmetrical PN junction; connects to protected line or ground reference depending on layout polarity. |
| Anode | Terminal 2 | Second terminal of bidirectional structure; enables clamping in either direction without circuit polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control units and ADAS sensor interfaces. |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 29.4 A while maintaining clamping below 13.6 V - critical for IEC 61000-4-5 compliance. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak temperature up to 260 °C - compatible with standard lead-free SMT assembly processes. |
| Glass passivated junction | Ensures stable electrical characteristics and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pairs or supply-to-ground paths. Use Value: Limits transient voltage to ≤13.6 V during 400 W surges, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines to shunt surge energy before reaching optocoupler or microcontroller GPIO. Use Value: Clamps 29.4 A transients within nanoseconds while maintaining ≤50 μA leakage at 8.0 V - avoids false triggering during normal operation. |
| Consumer Power Adapter Protection | Telecom Line Interface Protection |
|
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters and wall chargers subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS across 5 V/9 V/15 V output rails to prevent damage to USB-PD controllers and load switches. Use Value: 8.0 V VWM aligns precisely with USB PD 3.0 voltage profiles; 13.6 V VC ensures downstream FETs remain within SOA during surge events. |
Use Scenario: Protecting Ethernet PHYs and RS-485 transceivers in base station backhaul equipment from ESD and induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Differential-mode TVS pair on data lines (e.g., TX+/TX−) to suppress common-mode and differential transients simultaneously. Use Value: Symmetrical bidirectional response ensures equal clamping performance regardless of surge polarity - essential for full-duplex communication links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0CAHE3_A/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free packaging. | Preferred for commercial-grade automotive modules where halogen content is not restricted. | Select SMAJ8.0CAHE3_A/I when halogen-free certification is not required and cost optimization is prioritized. |
| SMBJ8.0CAHM3_A/I | Higher 600 W PPPM rating and larger SMB (DO-214AA) package; same VWM/VC but higher IPPM (43.5 A). | Better suited for high-energy surge environments (e.g., motor drives) requiring greater margin than 400 W. | Choose SMBJ8.0CAHM3_A/I only if board space allows larger footprint and system-level surge testing exceeds 400 W requirements. |
Compared with SMAJ8.0CAHE3_A/I, the SMAJ8.0CAHM3_A/I offers identical clamping performance with halogen-free compliance for stricter environmental mandates; versus SMBJ8.0CAHM3_A/I, it trades 200 W pulse power headroom for 30 % smaller PCB area and lower thermal mass in compact designs.
Availability
SMAJ8.0CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMAJ8.0CAHM3_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 and automotive-grade qualification.
The SMAJ series is engineered specifically for high-speed transient suppression in harsh environments, targeting design-in for automotive, industrial, and communications infrastructure where robustness and standardized qualification matter.
FAQ
What is the clamping voltage of SMAJ8.0CAHM3_A/I at its rated peak pulse current?
The SMAJ8.0CAHM3_A/I has a maximum clamping voltage (VC) of 13.6 V at 29.4 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value ensures downstream components like 5 V microcontrollers or CAN transceivers remain within safe operating voltage limits during surge events. The SMAJ8.0CAHM3_A/I maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMAJ8.0CAHM3_A/I qualified for automotive applications?
Yes, SMAJ8.0CAHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock - validating its suitability for engine control, body electronics, and ADAS sensor modules. The SMAJ8.0CAHM3_A/I also meets MSL Level 1 for reflow compatibility in automotive manufacturing.
How does the bidirectional configuration of SMAJ8.0CAHM3_A/I affect circuit design?
The bidirectional configuration of SMAJ8.0CAHM3_A/I eliminates polarity sensitivity, allowing placement across any two nodes without regard to signal direction or DC bias - ideal for protecting AC-coupled lines, differential buses (e.g., RS-485), or floating sensors. Unlike unidirectional TVS diodes, SMAJ8.0CAHM3_A/I provides symmetrical clamping in both directions, simplifying layout and reducing BOM count in systems with mixed-signal or dual-rail interfaces.
What is the thermal resistance of SMAJ8.0CAHM3_A/I, and how does it impact layout?
SMAJ8.0CAHM3_A/I 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. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA significantly. For repetitive surge conditions, designers must ensure average power dissipation stays below 3.3 W (PD rating) - meaning SMAJ8.0CAHM3_A/I is best applied in low-duty-cycle protection scenarios unless enhanced cooling is implemented.
Does SMAJ8.0CAHM3_A/I have halogen-free certification?
Yes, SMAJ8.0CAHM3_A/I is halogen-free and RoHS-compliant, as indicated by the "HM3" suffix per Vishay's ordering nomenclature and confirmed in the Mechanical Data section of document 88390. This certification satisfies IEC 61249-2-21 and JEDEC JS709C requirements for bromine and chlorine content, making SMAJ8.0CAHM3_A/I suitable for environmentally regulated markets including EU automotive and industrial equipment.
SMAJ8.0CAHM3_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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ8.0CAHM3_A/I FAQ
1.How can I place an order for SMAJ8.0CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CAHM3_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 SMAJ8.0CAHM3_A/I reliable?
The price and inventory of SMAJ8.0CAHM3_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 SMAJ8.0CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CAHM3_A/I?
SMAJ8.0CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CAHM3_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 SMAJ8.0CAHM3_A/I?
For technical support, including SMAJ8.0CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ8.0CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CAHM3_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 SMAJ8.0CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CAHM3_A/I?
All SMAJ8.0CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CAHM3_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 SMAJ8.0CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ8.0CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.0CAHM3_A/I Tags
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