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Vishay General Semiconductor - Diodes Division SMAJ9.0AHM3/H
- Part No.:
- SMAJ9.0AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0AHM3/H.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,084
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Product details
Overview
SMAJ9.0AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 9.0 V stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA test current, and clamps up to 15.4 V at 26.0 A peak pulse current (IPPM) under 10/1000 μs waveform - used for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ9.0AHM3/H datasheet, SMAJ9.0AHM3/H pinout, SMAJ9.0AHM3/H application, or SMAJ9.0AHM3/H equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, and real-world clamping performance data - critical for surge protection design validation in 12 V automotive subsystems and DC power input stages.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp with glass-passivated junction, optimized for fast response (<1 ns) to ESD and lightning-induced transients. Its 400 W peak pulse power rating (10/1000 μs) applies below 78 V; above that threshold, rating drops to 300 W - SMAJ9.0AHM3/H remains fully rated at 400 W per spec.
Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, and 30 °C/W (junction-to-lead). The device is halogen-free, RoHS-compliant, and qualified to AEC-Q101 - confirmed by HM3 suffix and "H" packaging code indicating 7" tape-and-reel delivery with AEC-Q101 compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 9.0 V - maximum continuous reverse operating voltage before significant leakage; sets minimum system operating margin for 12 V nominal rails. |
| VBR (Breakdown Voltage) | 10.0–11.1 V at IT = 1.0 mA - defines onset of avalanche conduction; tight 11% tolerance ensures predictable clamping initiation. |
| VC (Clamping Voltage) | 15.4 V at IPPM = 26.0 A - maximum voltage seen by protected circuit during 10/1000 μs surge; enables robust 12 V rail protection with >2.6 V headroom. |
| PPPM (Peak Pulse Power) | 400 W - energy-handling capacity for transient suppression; validated at TA = 25 °C with 0.01% duty cycle. |
| ID (Reverse Leakage) | 5.0 μA max at VWM - low leakage preserves efficiency in always-on power monitoring or low-power sensor circuits. |
| TJ max | 150 °C - maximum junction temperature; supports operation in under-hood automotive environments with proper PCB thermal relief. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking; compatible with automated SMT placement and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant (JEDEC J-STD-020), 0.064 g unit weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in unidirectional configuration | Connected to protected line (e.g., 12 V rail); clamps positive transients to ground when voltage exceeds VBR. |
| Anode | Ground reference terminal | Connected to system ground plane; forms low-inductance return path essential for effective transient energy diversion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control, body electronics, and ADAS power inputs. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising surge robustness; eliminates brominated flame retardants in molding compound. |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and IEC 61000-4-5 Combination Wave surges up to 1 kV/500 A in properly designed layouts. |
| Low clamping ratio (VC/VBR ≈ 1.5) | Minimizes overvoltage stress on downstream components - e.g., 15.4 V clamp limits MOSFET gate-source stress well below 20 V absolute max ratings. |
| Fast response time (<1 ns) | Activates before sensitive logic or analog circuitry sustains damage from ESD or fast-rising transients (e.g., relay bounce, CAN bus coupling). |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping transients before they reach regulator ICs. Use Value: Withstands 400 W surges while limiting voltage to ≤15.4 V - preserving 20 V-rated input capacitors and enabling single-stage protection without series impedance. |
Use Scenario: Analog output lines from pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting ESD (IEC 61000-4-2 ±8 kV contact) and cable-coupled noise to chassis ground. Use Value: 5.0 μA max leakage avoids signal offset errors in 4–20 mA loops; 15.4 V clamp protects op-amp inputs without requiring additional buffering. |
| Consumer Device USB Power Port | Telecom DC Feeder Protection |
Use Scenario: 5 V/9 V USB PD input stage in portable medical monitors subjected to accidental hot-plug transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line, coordinated with upstream fuse and downstream load switch. Use Value: 9.0 V VWM allows full 9 V PD operation while clamping 15.4 V - staying within 20 V absolute max of common USB PMICs like TPS6598x. |
Use Scenario: -48 V DC telecom power feeders entering base station cabinets, vulnerable to lightning-induced surges on long outdoor runs. IC Role / Device Role / Timing Role: First-line unidirectional clamp on feeder input, paired with gas discharge tube (GDT) for coarse protection. Use Value: 15.4 V clamping irrelevant at -48 V; instead, its 10.0–11.1 V VBR enables use as secondary clamp in stacked protection schemes where precise low-voltage triggering is needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0AHE3/H | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial designs where automotive qualification is unnecessary. | Select SMAJ9.0AHE3/H for cost-sensitive non-automotive applications with identical clamping performance. |
| SMBJ9.0A-H | Higher 600 W PPPM rating, larger SMB (DO-214AA) package, 12.3 V VC at 43.0 A IPPM. | Better suited for higher-energy threats (e.g., ISO 7637-2 Pulse 5a), but requires larger PCB area and different thermal layout. | Choose SMBJ9.0A-H only when 400 W is insufficient and board space allows SMB footprint. |
Compared with SMAJ9.0AHM3/H, SMAJ9.0AHE3/H offers identical protection performance without halogen-free or AEC-Q101 assurance, while SMBJ9.0A-H trades compact size for 50% higher surge capacity - making SMAJ9.0AHM3/H the optimal balance of automotive compliance, space efficiency, and 12 V system-level protection.
Availability
SMAJ9.0AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer USB power input stages requiring stable component supply with guaranteed AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ9.0AHM3/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 targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for rapid clamping, low leakage, and seamless integration into automated SMT production lines.
FAQ
What is the clamping voltage of SMAJ9.0AHM3/H at its rated peak pulse current?
The SMAJ9.0AHM3/H has a maximum clamping voltage (VC) of 15.4 V at 26.0 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects worst-case voltage seen by protected circuitry during surge events - critical for verifying compatibility with downstream IC voltage tolerances. The SMAJ9.0AHM3/H maintains this clamping performance across its qualified operating temperature range.
Is SMAJ9.0AHM3/H qualified for automotive applications?
Yes, SMAJ9.0AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix and "H" packaging code in its ordering designation. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating its suitability for under-hood and body-control module applications. The SMAJ9.0AHM3/H meets all requirements for automotive-grade transient suppression per ISO 16750-2 and ISO 7637-2 standards.
How does the VWM of SMAJ9.0AHM3/H relate to typical 12 V automotive systems?
The SMAJ9.0AHM3/H has a 9.0 V stand-off voltage (VWM), providing ≥3 V margin below nominal 12 V system voltage and accommodating normal battery fluctuations (e.g., 9–16 V range). This ensures minimal reverse leakage (<5.0 μA) during steady-state operation while allowing immediate avalanche conduction when transients exceed 10.0 V breakdown. In 12 V automotive designs, SMAJ9.0AHM3/H is typically placed directly at power entry points ahead of regulators or controllers.
What is the thermal resistance of SMAJ9.0AHM3/H, and how does it affect PCB layout?
SMAJ9.0AHM3/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 standard FR-4 PCB with no internal planes; adding thermal vias or ground-plane copper pour reduces RθJA significantly. For sustained surge duty or high ambient temperatures, layout must allocate adequate copper area - SMAJ9.0AHM3/H's 150 °C max junction temperature requires careful thermal design to avoid derating of pulse power capability.
Does SMAJ9.0AHM3/H have polarity markings, and how is it oriented in circuit?
Yes, SMAJ9.0AHM3/H is unidirectional and features a visible cathode band at one end of the SMA (DO-214AC) package. During installation, the banded end connects to the line being protected (e.g., 12 V rail), while the unbanded end connects to system ground. This orientation ensures forward conduction only during negative transients - but since SMAJ9.0AHM3/H is unidirectional, it suppresses positive surges by avalanche breakdown from cathode to anode. Correct polarity is essential; reverse installation renders it ineffective.
SMAJ9.0AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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)
SMAJ9.0AHM3/H FAQ
1.How can I place an order for SMAJ9.0AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0AHM3/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 SMAJ9.0AHM3/H reliable?
The price and inventory of SMAJ9.0AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ9.0AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0AHM3/H?
SMAJ9.0AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0AHM3/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 SMAJ9.0AHM3/H?
For technical support, including SMAJ9.0AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0AHM3/H requirements.
6.How does Aetrix verify that SMAJ9.0AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0AHM3/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 SMAJ9.0AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ9.0AHM3/H?
All SMAJ9.0AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0AHM3/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 SMAJ9.0AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ9.0AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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