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Vishay General Semiconductor - Diodes Division SMAJ8.0CAHM3_A/H
- Part No.:
- SMAJ8.0CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CAHM3_A/H.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ8.0CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping ESD and surge transients on signal/power lines. It features 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 (10/1000 μs waveform), commonly deployed to protect USB interfaces, sensor I/O, and automotive body control modules.
For engineers reviewing the SMAJ8.0CAHM3_A/H datasheet, SMAJ8.0CAHM3_A/H pinout, SMAJ8.0CAHM3_A/H application, or SMAJ8.0CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, low leakage (<1.0 μA at VWM), AEC-Q101 qualification status, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ) up to 8.0 V reverse stand-off voltage; during transients exceeding breakdown (VBR min = 8.89 V, max = 9.83 V at 1 mA), it avalanches rapidly to limit voltage to ≤13.6 V at 29.4 A. Its bidirectional symmetry ensures identical clamping in both polarities - critical for AC-coupled or floating signal lines.
Thermally, it sustains operation from −55 °C to +150 °C junction temperature, with RθJA = 120 °C/W and RθJL = 30 °C/W. The halogen-free, RoHS-compliant HM3 suffix confirms compliance with JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (peak 260 °C).
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 1 mA - Breakdown onset tolerance band; determines earliest clamping activation threshold. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamped voltage under 10/1000 μs surge; must stay below protected IC's absolute maximum rating. |
| ID @ VWM | <1.0 μA - Reverse leakage at stand-off; ensures minimal signal loading and power loss in battery-powered systems. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling per 10/1000 μs pulse; defines single-event robustness. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with standard 0.2" pad layout. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation - no cathode/anode distinction required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient return path (bidirectional) | Provides symmetrical conduction path for positive or negative surges; connects to protected line or ground reference. |
| Cathode (Terminal 2) | Transient return path (bidirectional) | Electrically identical to Terminal 1; forms dual-junction structure enabling equal clamping in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both polarities - eliminates need for polarity-aware layout in AC or differential signal protection. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for BCM, infotainment, and ADAS subsystems. |
| Halogen-free & RoHS | HM3 suffix confirms JESD201 Class 2 whisker resistance and UL 94 V-0 flammability - meets Tier-1 automotive and industrial environmental mandates. |
| Low clamping ratio | VC/VWM = 1.7 - tight voltage margin between stand-off and clamping improves system-level surge margin versus competing TVS diodes. |
| Fast response time | <1.0 ps - intrinsic avalanche speed enables suppression of sub-nanosecond ESD events per IEC 61000-4-2 Level 4 (15 kV air). |
Applications
| Automotive Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
|
Use Scenario: Protecting LIN bus-connected temperature/pressure sensors in engine bay against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping element placed between signal line and chassis ground, activated within picoseconds of overvoltage event. Use Value: Maintains signal integrity below 13.6 V clamping while surviving 400 W surges - prevents MCU input latch-up or ADC saturation. |
Use Scenario: Safeguarding D+ and D− lines of USB host controllers from ESD and hot-plug transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector, absorbing ±15 kV contact discharge per IEC 61000-4-2 without signal distortion. Use Value: Sub-1 μA leakage preserves USB suspend current budget; low capacitance (≈200 pF at 0 V) avoids data rate degradation at 480 Mbps. |
| Industrial PLC Digital I/O | Telecom Ethernet PHY Protection |
|
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from inductive kickback and lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between field input and internal optocoupler, conducting only during >8.89 V transients. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle - extends service life in factory-floor environments with frequent solenoid switching. |
Use Scenario: Front-end surge protection for 10/100BASE-TX Ethernet PHYs in network switches exposed to induced surges on unshielded twisted pair. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair (MDI/MDIX), referenced to local ground plane with minimal loop area. Use Value: Matches IEEE 802.3af surge immunity requirements; 13.6 V clamping stays below PHY receiver common-mode limits (±12 V typical). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0CAHE3_A/H | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification; no JESD201 Class 2 whisker test. | Approved for non-automotive industrial use where halogen-free mandate does not apply; lower cost for consumer electronics. | Select when AEC-Q101 and halogen-free requirements are waived; verify board-level reflow compatibility with E3 thermal profile. |
| SMBJ8.0CAHM3_A/H | Same VWM/VBR/VC, but SMB (DO-214AA) package - 20% larger footprint, 50% higher PPPM (600 W), higher RθJA (100 °C/W). | Better suited for high-energy surge zones (e.g., power supply inputs); requires larger PCB real estate and thermal relief. | Choose when system-level surge tests exceed 400 W; avoid if space-constrained or targeting USB/sensor-level protection. |
Compared with SMAJ8.0CAHE3_A/H, the SMAJ8.0CAHM3_A/H adds halogen-free compliance and whisker resistance for automotive use; versus SMBJ8.0CAHM3_A/H, it trades peak power headroom for compact size and tighter thermal coupling in dense layouts.
Availability
SMAJ8.0CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, USB interface hardening, industrial PLC I/O conditioning, and telecom PHY surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ8.0CAHM3_A/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series targets board-level transient protection in automotive, industrial, and communications systems - engineered for fast response, repeatable clamping, and AEC-Q101 compliance where failure modes demand zero-risk surge resilience.
FAQ
What is the clamping voltage of SMAJ8.0CAHM3_A/H at its rated peak pulse current?
The SMAJ8.0CAHM3_A/H exhibits a maximum clamping voltage (VC) of 13.6 V when subjected to its specified peak pulse current (IPPM) of 29.4 A under the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C on 0.2" × 0.2" copper pads and represents the upper bound of voltage seen by downstream circuitry during surge events - critical for ensuring protected ICs remain within their absolute maximum ratings. The SMAJ8.0CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMAJ8.0CAHM3_A/H suitable for automotive applications?
Yes, SMAJ8.0CAHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification per automotive standards. Its −55 °C to +150 °C operating range, halogen-free construction, and JESD201 Class 2 whisker resistance make SMAJ8.0CAHM3_A/H appropriate for under-hood and cabin modules such as body control units, sensor interfaces, and infotainment power rails.
How does the bidirectional design of SMAJ8.0CAHM3_A/H affect its circuit implementation?
The bidirectional architecture of SMAJ8.0CAHM3_A/H eliminates polarity marking - both terminals are functionally identical - allowing direct placement across any two-node signal path without orientation concerns. This simplifies layout for AC-coupled lines (e.g., RS-485, CAN, USB D+/D−) and floating references, reducing BOM count and assembly errors. Unlike unidirectional TVS diodes, SMAJ8.0CAHM3_A/H provides symmetric clamping above +8.89 V and below −8.89 V, ensuring balanced protection for differential or bipolar signals without additional external components.
What is the maximum leakage current of SMAJ8.0CAHM3_A/H at its stand-off voltage?
The SMAJ8.0CAHM3_A/H specifies a maximum reverse leakage current (ID) of 1.0 μA at its 8.0 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage ensures minimal impact on signal integrity and power budget in high-impedance or battery-operated circuits - for example, preserving sleep-mode current in automotive door module microcontrollers or maintaining accuracy in precision sensor front-ends. Leakage remains below 5 μA up to 125 °C per derating curves in the datasheet.
Can SMAJ8.0CAHM3_A/H be used in place of a unidirectional TVS like SMAJ8.0A?
No - SMAJ8.0CAHM3_A/H is strictly bidirectional and cannot substitute for unidirectional devices like SMAJ8.0A in DC-biased circuits where forward conduction must be blocked. SMAJ8.0A conducts only in reverse breakdown and blocks forward current (VF ≈ 3.5 V at 25 A), whereas SMAJ8.0CAHM3_A/H conducts symmetrically in both directions. Using SMAJ8.0CAHM3_A/H in a unidirectional application may cause unintended forward conduction or fail to meet system-level DC blocking requirements. Always match TVS polarity to circuit topology.
SMAJ8.0CAHM3_A/H 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/H FAQ
1.How can I place an order for SMAJ8.0CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CAHM3_A/H 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/H reliable?
The price and inventory of SMAJ8.0CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CAHM3_A/H?
SMAJ8.0CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CAHM3_A/H 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/H?
For technical support, including SMAJ8.0CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ8.0CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CAHM3_A/H?
All SMAJ8.0CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ8.0CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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