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Vishay General Semiconductor - Diodes Division SMAJ7.5AHM3/I
- Part No.:
- SMAJ7.5AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AHM3/I.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,799
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Product details
Overview
SMAJ7.5AHM3/I 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 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA, 12.9 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFETs and ICs in automotive and industrial power supplies.
For engineers reviewing the SMAJ7.5AHM3/I datasheet, SMAJ7.5AHM3/I pinout, SMAJ7.5AHM3/I application, or SMAJ7.5AHM3/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) for board-level surge protection design.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging an avalanche junction with glass passivation for stable breakdown behavior. Its unidirectional configuration requires cathode-band orientation toward the protected circuit's ground reference, and it delivers sub-nanosecond response time to suppress transients induced by inductive switching or ESD.
The device is rated for repetitive 10/1000 μs surges at 0.01 % duty cycle (400 W ≤ 78 V; 300 W > 78 V), with thermal derating above 25 °C per Fig. 2. Junction temperature range spans –55 °C to +150 °C, and it meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR min/max | 8.33 V / 9.21 V at IT = 1.0 mA - Confirmed breakdown threshold range defining reliable avalanche initiation point. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamped voltage seen by protected circuit during worst-case 10/1000 μs transient; determines stress on downstream components. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; defines transient immunity level for automotive load-dump and ISO 7637-2 compliance margin. |
| ID @ VWM | 100 μA - Reverse leakage at stand-off voltage; low value minimizes quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with minimal heatsinking. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB layout thermal pad sizing requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity indicated by cathode band; unidirectional only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to the line or power rail requiring transient protection; current flows into anode during forward conduction (e.g., during fault conditions). |
| Cathode | Ground/reference side | Connected to system ground or low-impedance return path; clamping action occurs between cathode and anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in engine control units and ADAS power rails. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead-free terminations-meets EU ELV and China RoHS environmental mandates. |
| 400 W peak pulse power | Rated for 10/1000 μs waveform at TA = 25 °C-supports robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges. |
| MSL Level 1 | No floor life limitation and compatible with standard SMT reflow profiles up to 260 °C peak-eliminates bake requirements prior to assembly. |
| Low incremental surge resistance | Enables tight VC/VBR ratio (12.9 V / ~8.8 V ≈ 1.47)-minimizes let-through voltage to safeguard 5 V and 3.3 V logic interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 12 V supply inputs of body control modules (BCM) against load dump transients up to 35 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and DC-DC input, clamping within <1 ns to limit voltage excursion. Use Value: Prevents damage to upstream PMICs and microcontrollers by limiting peak voltage to 12.9 V during 31 A surge events. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLCs from EFT and surge coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point, oriented to clamp reverse transients toward common-mode ground. Use Value: Maintains signal integrity below 100 μA leakage at 7.5 V while suppressing ±1 kV EFT bursts without affecting loop accuracy. |
| Consumer Device USB Port Surge Suppression | Telecom Power Supply Input Stage |
Use Scenario: Safeguarding VBUS line of USB 2.0 ports in smart home hubs against hot-plug induced transients and nearby ESD discharge. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBUS and GND, sized to handle 30 A 8/20 μs surges with minimal footprint. Use Value: Achieves <13 V clamping at full rated current-ensures USB PHY ICs remain within absolute maximum ratings during real-world plug-in events. |
Use Scenario: Front-end protection of AC/DC adapter secondary-side 5 V or 12 V outputs feeding telecom baseband processors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after bulk capacitor but before LDO regulator input, absorbing residual switch-mode noise spikes. Use Value: Withstands 400 W pulses without degradation, enabling long-term reliability in 24/7 powered telecom infrastructure equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5AHE3/I | Same electrical specs and package, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Approved for non-automotive industrial and consumer designs where halogen content and automotive qualification are not mandated. | Select when cost sensitivity outweighs halogen-free or automotive reliability requirements. |
| SMBJ7.5A-M3 | Higher 600 W peak pulse power rating, SMB (DO-214AA) package with larger thermal mass and 1.5× higher IFSM (100 A vs. 40 A). | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint. | Choose when higher surge margin or improved thermal performance is required and SMA footprint constraint is relaxed. |
Compared with SMAJ7.5AHM3/I, SMAJ7.5AHE3/I offers identical clamping and stand-off performance but omits halogen-free construction and AEC-Q101 validation, while SMBJ7.5A-M3 trades compactness for greater surge endurance and thermal capability-making each suitable for distinct reliability, regulatory, and layout-driven design priorities.
Availability
SMAJ7.5AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer USB power protection requiring stable component supply, halogen-free compliance, and AEC-Q101 assurance.
Supply support for SMAJ7.5AHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the polarity configuration of SMAJ7.5AHM3/I?
SMAJ7.5AHM3/I is a unidirectional TVS diode, with polarity marked by a cathode band on the SMA package body. The cathode terminal must be connected toward the system ground or lower-potential reference node to enable proper clamping action during positive transients on the anode side. This configuration ensures low leakage at 7.5 V stand-off while providing precise avalanche-based voltage limiting-critical for protecting sensitive 5 V or 3.3 V ICs downstream of the SMAJ7.5AHM3/I.
Does SMAJ7.5AHM3/I meet automotive qualification standards?
Yes, SMAJ7.5AHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay documentation. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD robustness-validating its suitability for under-hood and chassis-mounted automotive applications such as body control modules, infotainment power supplies, and ADAS sensor interfaces. The SMAJ7.5AHM3/I data sheet explicitly lists AEC-Q101 in its mechanical and ordering information sections.
What is the maximum clamping voltage of SMAJ7.5AHM3/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ7.5AHM3/I is 12.9 V, measured at its rated peak pulse current (IPPM) of 31.0 A using the standardized 10/1000 μs waveform. This value represents the highest voltage that will appear across the device-and thus be imposed on the protected circuit-during a worst-case transient event. Engineers use this parameter to verify that downstream components like microcontrollers or voltage regulators remain within their absolute maximum voltage ratings when SMAJ7.5AHM3/I is deployed.
How does the HM3 suffix affect the environmental compliance of SMAJ7.5AHM3/I?
The HM3 suffix on SMAJ7.5AHM3/I denotes halogen-free, RoHS-compliant construction-including bromine- and chlorine-free molding compound and lead-free matte tin terminations-meeting both EU RoHS Directive 2011/65/EU and China RoHS GB/T 26572-2011 requirements. Unlike E3-suffixed variants, HM3 ensures zero halogen content (<900 ppm Br+Cl), supporting sustainability goals in automotive and industrial OEM supply chains where material declarations and substance restrictions are strictly enforced for SMAJ7.5AHM3/I.
What is the thermal resistance of SMAJ7.5AHM3/I, and how does it impact PCB layout?
SMAJ7.5AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly governs allowable power dissipation in sustained or repetitive surge scenarios: for example, at 3.3 W steady-state power (PD), junction temperature rise would be ~396 °C-exceeding limits-so the device relies on transient-only operation. PCB layout must therefore provide adequate copper area and thermal vias to manage short-duration pulse heating, especially in high-temperature ambient environments where SMAJ7.5AHM3/I is used.
SMAJ7.5AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5AHM3/I FAQ
1.How can I place an order for SMAJ7.5AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AHM3/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 SMAJ7.5AHM3/I reliable?
The price and inventory of SMAJ7.5AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AHM3/I?
SMAJ7.5AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AHM3/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 SMAJ7.5AHM3/I?
For technical support, including SMAJ7.5AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AHM3/I requirements.
6.How does Aetrix verify that SMAJ7.5AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AHM3/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 SMAJ7.5AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AHM3/I?
All SMAJ7.5AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AHM3/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 SMAJ7.5AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ7.5AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5AHM3/I Tags
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Diodes Incorporated
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