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Vishay General Semiconductor - Diodes Division SMAJ8.0AHM3_A/H
- Part No.:
- SMAJ8.0AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0AHM3_A/H.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,056
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Product details
Overview
SMAJ8.0AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 8.0 V stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 10 mA, 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 interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ8.0AHM3_A/H datasheet, SMAJ8.0AHM3_A/H pinout, SMAJ8.0AHM3_A/H application, or SMAJ8.0AHM3_A/H equivalent, key selection criteria include unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<50 μA at VWM), while the SMA package supports high surge current handling without thermal runaway under repetitive 0.01% duty cycle pulses.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 30 °C/W junction-to-lead, enabling reliable operation in engine bay and motor drive environments. Its 10/1000 μs waveform response delivers sub-nanosecond turn-on time and clamps transients before downstream components experience overvoltage stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail voltage. |
| VBR (min/max) | 8.89 V / 9.83 V at 10 mA - Confirmed breakdown range defining precise clamping onset; tight 10.5% tolerance enables predictable protection thresholds. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamped voltage during 400 W transient; ensures protected ICs see <13.6 V even under worst-case surge. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy absorption capability; derates to 300 W above 78 V per spec. |
| ID @ VWM | 50 μA max - Low reverse leakage preserves power rail integrity and avoids false triggering in low-current sensor circuits. |
| TJ max. | +150 °C - Enables use in under-hood automotive modules and industrial motor drives without thermal derating penalties. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with J-STD-020 MSL level 1 reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, footprint dimensions 4.93 mm × 2.92 mm × 2.29 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; forms cathode-referenced clamping path to ground or rail. |
| Cathode | Avalanche conduction terminal | Marked by band; connected to higher-potential side (e.g., VCC or signal line); conducts surge current to reference plane during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V automotive power rails. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20D; eliminates brominated flame retardants for safer end-of-life processing. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients; critical for protecting 3.3 V and 5 V logic-level interfaces. |
| MSL level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns; eliminates baking requirement prior to SMT placement. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VBAT and GND, triggered within <1 ns to limit voltage excursion. Use Value: Prevents latch-up or gate oxide damage in MCU power supplies and CAN transceivers during alternator regulation failure. |
Use Scenario: Guarding analog front-end inputs of pressure/temperature sensors exposed to ESD in factory automation equipment. IC Role / Device Role / Timing Role: Low-leakage TVS shunting ESD events (IEC 61000-4-2 ±8 kV contact) before signal conditioning amplifiers. Use Value: Maintains <50 μA leakage at 8.0 V to avoid DC offset errors in 24-bit ADC reference paths while clamping to ≤13.6 V. |
| DC Motor Drive Board Protection | Telecom Power Supply Input Stage |
|
Use Scenario: Absorbing inductive kickback from brushed DC motors switching at 20 kHz in robotic actuators. IC Role / Device Role / Timing Role: Fast-response TVS across motor terminals or H-bridge supply rails, conducting surge current away from MOSFETs. Use Value: Limits voltage spikes to <13.6 V, preventing avalanche-induced failure in 40 V-rated N-channel power FETs. |
Use Scenario: Secondary-side transient suppression on 48 V telecom rectifier outputs feeding base station RF modules. IC Role / Device Role / Timing Role: Stand-off-rated TVS placed after bulk capacitor to clamp residual surges escaping primary-stage MOVs. Use Value: Provides precise 8.0 V clamping margin above nominal 5 V logic rails while sustaining 29.4 A peak current without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0AHE3_A/H | Same electrical specs but RoHS-compliant (non-halogen-free) and commercial-grade; lacks AEC-Q101 qualification. | Approved for consumer and industrial use only; not certified for automotive under-hood deployment. | Select when halogen-free content is not mandated and automotive qualification is unnecessary. |
| SMBJ8.0A-H | Higher 600 W PPPM rating in larger SMB (DO-214AA) package; 15.0 V VC at 38.8 A; RθJA = 85 °C/W. | Better thermal performance and surge margin but requires larger PCB area and different pad layout. | Choose when higher surge immunity is required and board space permits SMB footprint. |
Compared with SMAJ8.0AHM3_A/H, SMAJ8.0AHE3_A/H offers identical clamping behavior without halogen-free assurance or automotive qualification, while SMBJ8.0A-H trades compactness for greater power handling and lower thermal resistance - making it suitable where layout allows and surge severity exceeds 400 W.
Availability
SMAJ8.0AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, telecom power systems, and sensor interface designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ8.0AHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in harsh environments, targeting automotive, industrial, and communications systems where precision clamping, AEC-Q101 compliance, and surface-mount manufacturability are essential.
FAQ
What is the clamping voltage of SMAJ8.0AHM3_A/H at its rated peak pulse current?
The SMAJ8.0AHM3_A/H has a maximum clamping voltage (VC) of 13.6 V at its rated peak pulse current (IPPM) of 29.4 A, measured using the standard 10/1000 μs double-exponential waveform. This value ensures protected downstream circuitry remains within safe operating limits during transient events. The SMAJ8.0AHM3_A/H maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMAJ8.0AHM3_A/H qualified for automotive applications?
Yes, SMAJ8.0AHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes stress testing per AEC-Q101 including temperature cycling, high-temperature operating life, and ESD qualification. The SMAJ8.0AHM3_A/H is approved for use in engine control units, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is critical.
How does the SMAJ8.0AHM3_A/H differ from the SMAJ8.0A-E3 variant?
The SMAJ8.0AHM3_A/H differs from SMAJ8.0A-E3 in three key aspects: it is halogen-free (vs. standard RoHS), AEC-Q101 qualified (vs. commercial grade), and supplied in 7" tape-and-reel with package code "H" (vs. "61" for E3). Electrically, both share identical VWM (8.0 V), VBR (8.89–9.83 V), and VC (13.6 V). The SMAJ8.0AHM3_A/H is intended for automotive deployments where material compliance and qualification are mandatory.
What is the thermal resistance of SMAJ8.0AHM3_A/H, and how does it affect PCB layout?
The SMAJ8.0AHM3_A/H 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 minimum recommended pad layout per Vishay's DO-214AC footprint. To maintain reliability under repetitive surges, designers must allocate adequate copper area and avoid excessive trace length - the SMAJ8.0AHM3_A/H relies on PCB copper for heat dissipation due to its lack of internal thermal vias or exposed pad.
Can SMAJ8.0AHM3_A/H be used in bidirectional signal line protection?
No, SMAJ8.0AHM3_A/H is a unidirectional TVS diode, identifiable by its cathode band marking and specified parameters (e.g., VF = 3.5 V at 25 A forward current). For bidirectional signal line protection, a part with "CA" suffix such as SMAJ8.0CA must be selected - it provides symmetrical clamping in both polarities and omits the cathode marking. Using SMAJ8.0AHM3_A/H on AC-coupled or differential lines risks forward conduction and improper clamping behavior.
SMAJ8.0AHM3_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:
- 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/H FAQ
1.How can I place an order for SMAJ8.0AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/H reliable?
The price and inventory of SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.0AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0AHM3_A/H?
SMAJ8.0AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/H?
For technical support, including SMAJ8.0AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ8.0AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.0AHM3_A/H?
All SMAJ8.0AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0AHM3_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 SMAJ8.0AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ8.0AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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