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Vishay General Semiconductor - Diodes Division SMAJ8.0AHM3_A/I
- Part No.:
- SMAJ8.0AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0AHM3_A/I.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,257
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Product details
Overview
SMAJ8.0AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for primary overvoltage protection of DC power rails and signal 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 (PPPM) with 10/1000 μs waveform - deployed in automotive infotainment power inputs and industrial sensor interface protection.
For engineers reviewing the SMAJ8.0AHM3_A/I datasheet, SMAJ8.0AHM3_A/I pinout, SMAJ8.0AHM3_A/I application, or SMAJ8.0AHM3_A/I equivalent, key selection criteria include clamping performance under 29.4 A surge, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 8.0 V stand-off threshold. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for protecting MOSFET gates and microcontroller I/O against ESD and inductive switching transients.
The device is rated for -55 °C to +150 °C operating junction temperature, with 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient. Its 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design (0.2" × 0.2") to sustain repetitive 400 W pulses at 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 9–12 V systems. |
| VBR min/max | 8.89 V / 9.83 V at 1 mA - Breakdown voltage range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamping voltage limits downstream IC stress during 10/1000 μs surge; stays below 15 V absolute max rating of many 3.3 V/5 V logic interfaces. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; supports protection against ISO 7637-2 Pulse 1/2a/3a in automotive applications. |
| ID @ VWM | 50 μA - Low reverse leakage at 8.0 V ensures minimal quiescent current drain in battery-powered sensor nodes. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures without derating. |
| Package | SMA (DO-214AC) - Surface-mount package with 0.208" × 0.157" footprint; compatible with standard SMT reflow profiles (peak 260 °C, MSL Level 1). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads. Cathode indicated by band marking on body; anode is unmarked end. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for front-end power protection in ADAS ECUs. |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-609A Class 1 requirements; eliminates brominated flame retardants for safer end-of-life processing. |
| 400 W peak pulse power (10/1000 μs) | Withstands repeated load-dump surges up to 300 ms duration in 12 V vehicle systems without degradation. |
| Low clamping ratio (VC/VWM = 1.7) | Minimizes voltage overshoot across protected ICs - critical for safeguarding 5 V tolerant GPIOs and CAN transceivers. |
| Fast response time (<1 ns) | Clamps transients before propagation into sensitive analog front-ends or microcontroller ADC inputs. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: 12 V battery-fed infotainment head unit exposed to ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS placed between input fuse and DC-DC converter input to clamp transients before they reach regulation stage. Use Value: Limits voltage to ≤13.6 V during 29.4 A surge, preventing overvoltage damage to buck controller ICs rated for 16 V max input. |
Use Scenario: 4–20 mA current loop transmitter in factory automation PLC module subjected to field wiring ESD and cable coupling noise. IC Role / Device Role / Timing Role: TVS mounted across loop terminals to shunt fast transients while maintaining <50 μA leakage at 24 V nominal. Use Value: Prevents latch-up in precision op-amps and DACs by clamping induced spikes to <14 V within nanoseconds. |
| Consumer USB Port Surge Suppression | Telecom Base Station DC Power Rail Guard |
|
Use Scenario: USB Type-C port on portable media player connected to automotive charger with poor transient filtering. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line upstream of USB PD controller to absorb hot-plug and ESD events. Use Value: Maintains 8.0 V stand-off to avoid interfering with 5 V negotiation, while clamping 8 kV contact ESD to <13.6 V. |
Use Scenario: -48 V DC distribution rail in 4G/5G macro base station cabinet subject to lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: TVS array element used in multi-stage protection scheme with GDT and MOV to handle fast-rising edge components. Use Value: Provides sub-10 ns response to complement slower primary protectors, limiting let-through voltage to telecom ASICs with 50 V abs max rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0AHE3_A/I | Same electrical specs, but RoHS-compliant with brominated flame retardant (E3); not halogen-free. | Acceptable for commercial/industrial use where halogen-free mandate does not apply; excluded from automotive Tier 1 supply chains requiring HM3. | Select SMAJ8.0AHM3_A/I when halogen-free compliance is required per customer specification or regional environmental regulations. |
| SMAJ8.0A-M3/5A | Identical electrical and thermal specs; differs only in packaging - 7500-piece 13" reel vs. 1800-piece 7" reel (I vs. 5A code). | No functional difference; choice depends solely on production volume and SMT line feeder compatibility. | Choose SMAJ8.0AHM3_A/I for medium-batch prototyping or low-volume manufacturing with 7" tape-and-reel feeders. |
Compared with SMAJ8.0AHE3_A/I, SMAJ8.0AHM3_A/I adds halogen-free compliance without sacrificing clamping performance or thermal capability; versus SMAJ8.0A-M3/5A, it offers identical protection function but in a different reel configuration optimized for smaller production runs.
Availability
SMAJ8.0AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and consumer USB power protection requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ8.0AHM3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal integrity or power efficiency.
FAQ
What is the clamping voltage of SMAJ8.0AHM3_A/I at its rated peak pulse current?
The SMAJ8.0AHM3_A/I has a maximum clamping voltage (VC) of 13.6 V when subjected to its rated peak pulse current (IPPM) of 29.4 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures predictable voltage limiting during surge events - a critical parameter for safeguarding downstream 5 V or 3.3 V logic circuits. The SMAJ8.0AHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ8.0AHM3_A/I qualified for automotive applications?
Yes, SMAJ8.0AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥ 8 kV). The SMAJ8.0AHM3_A/I is approved for use in automotive subsystems such as body control modules, infotainment power supplies, and sensor interfaces where reliability under vibration, thermal shock, and electrical transients is mandatory.
How does the HM3 suffix differ from E3 or HE3 in the SMAJ8.0A family?
The HM3 suffix in SMAJ8.0AHM3_A/I denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-609A Class 1, whereas E3 indicates RoHS-compliant with brominated flame retardants, and HE3 adds AEC-Q101 qualification to E3. SMAJ8.0AHM3_A/I combines both AEC-Q101 qualification and halogen-free materials - making it suitable for automotive Tier 1 suppliers with strict material declarations. All three share identical electrical parameters and SMA package dimensions.
What is the thermal resistance of SMAJ8.0AHM3_A/I, and how does it affect PCB layout?
The SMAJ8.0AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2" per terminal). To sustain repetitive 400 W pulses, PCB layout must provide adequate copper area and thermal vias - undersized pads increase junction temperature, reducing surge endurance. The SMAJ8.0AHM3_A/I also features RθJL = 30 °C/W (junction-to-lead), supporting heat transfer through solder joints to inner-layer planes.
Can SMAJ8.0AHM3_A/I be used in bidirectional protection circuits?
No, SMAJ8.0AHM3_A/I is a unidirectional TVS diode, identifiable by its cathode band marking and specified breakdown characteristics for reverse-biased operation only. For bidirectional protection, Vishay offers the SMAJ8.0CA variant (e.g., SMAJ8.0CA-M3/5A), which provides symmetrical clamping in both polarities. Using SMAJ8.0AHM3_A/I in bidirectional applications risks forward conduction and failure during positive transients - always match device polarity to circuit topology.
SMAJ8.0AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ8.0AHM3_A/I FAQ
1.How can I place an order for SMAJ8.0AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/I reliable?
The price and inventory of SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.0AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0AHM3_A/I?
SMAJ8.0AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/I?
For technical support, including SMAJ8.0AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ8.0AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.0AHM3_A/I?
All SMAJ8.0AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ8.0AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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