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Vishay General Semiconductor - Diodes Division SMAJ7.5AHE3_A/H
- Part No.:
- SMAJ7.5AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AHE3_A/H.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
SMAJ7.5AHE3_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 a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA, 12.9 V maximum clamping voltage (VC) at 31.0 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 SMAJ7.5AHE3_A/H datasheet, SMAJ7.5AHE3_A/H pinout, SMAJ7.5AHE3_A/H application, or SMAJ7.5AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low 0.067 %/°C VBR temperature coefficient, 100 μA max reverse leakage at VWM, 150 °C max junction temperature, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping protection device that conducts above its breakdown threshold to shunt transient energy away from downstream circuitry. Its glass-passivated junction ensures stable avalanche characteristics, while the SMA package provides low thermal resistance (RθJL = 30 °C/W) and meets MSL Level 1 per J-STD-020.
The device responds in <1 ps to transients and maintains clamping performance across -55 °C to +150 °C operating range. It is rated for 40 A non-repetitive forward surge current (IFSM) and exhibits low incremental surge resistance - critical for limiting let-through voltage during 8.3 ms line surges and lightning-induced spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail voltage |
| VBR min/max | 8.33 V / 9.21 V at IT = 1.0 mA - defines precise avalanche onset window for predictable turn-on behavior |
| VC @ IPPM | 12.9 V at 31.0 A - peak clamped voltage during 10/1000 μs surge; determines maximum stress on protected IC |
| PPPM | 400 W - peak pulse power handling capability with standard 10/1000 μs waveform; validates robustness against IEC 61000-4-5 surges |
| ID @ VWM | 100 μA - maximum reverse leakage at stand-off voltage; ensures minimal quiescent power loss in battery-powered systems |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and IPC-7351B footprints |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts avalanche current to ground when voltage exceeds VBR |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in ADAS, body control, and powertrain modules |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation when mounted on recommended 0.2" × 0.2" copper pads |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage exposure to downstream components - critical for protecting 3.3 V and 5 V logic interfaces |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free soldering without preconditioning; eliminates moisture-related popcorning risk during assembly |
| 0.067 %/°C VBR tempco | Ensures stable clamping threshold across wide temperature ranges - reduces design margin uncertainty in thermal-cycling applications |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in vehicle infotainment head units from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery input and DC-DC converter input stage. Use Value: Limits let-through voltage to ≤12.9 V during 35 V/100 ms load dump events, preventing overvoltage shutdown of PMICs and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure sensors in factory automation PLC modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-mode protector on 4–20 mA current loop output lines, connected anode-to-ground. Use Value: Clamps induced spikes up to 31 A without latch-up, preserving sensor accuracy and avoiding false trip in safety-critical loops. |
| Consumer USB Port ESD Protection | Telecom Base Station DC Feeder Protection |
|
Use Scenario: Secondary-level ESD protection on VBUS line of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response TVS placed after primary polymer PTC, cathode to VBUS, anode to ground. Use Value: Absorbs ±15 kV contact discharge (IEC 61000-4-2) with sub-1 ps response, maintaining VBUS integrity below 13 V during event. |
Use Scenario: Surge suppression on -48 V DC feeder lines entering 5G remote radio units mounted on cell towers. IC Role / Device Role / Timing Role: Primary surge diverter on telecom power input, configured unidirectionally with cathode to -48 V rail. Use Value: Handles repeated 10/1000 μs surges up to 400 W while maintaining <100 μA leakage - avoids standby current drain in always-on systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101) | Lacks automotive qualification; not suitable for under-hood or safety-critical vehicle systems | Select SMAJ7.5AHE3_A/H when AEC-Q101 compliance is required; choose SMAJ7.5A-E3/61 for cost-sensitive consumer designs. |
| SMCJ7.5AHE3_A/H | Same AEC-Q101 qualification and VWM/VBR/VC ratings, but in larger SMC (DO-214AB) package with 1500 W PPPM rating | Higher power handling enables use in higher-energy surge environments (e.g., AC mains inputs), but requires larger PCB area | Choose SMAJ7.5AHE3_A/H for space-constrained 400 W applications; select SMCJ7.5AHE3_A/H where >1 kW surge immunity is needed. |
Compared with SMAJ7.5A-E3/61, SMAJ7.5AHE3_A/H adds automotive qualification without sacrificing clamping performance or footprint; versus SMCJ7.5AHE3_A/H, it trades peak power capacity for compact size - making it optimal for dense automotive ECUs and portable industrial sensors.
Availability
SMAJ7.5AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer USB power protection, and telecom DC feeder applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMAJ7.5AHE3_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, TVS devices, and optoelectronics with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series was engineered specifically for high-speed transient suppression in space-constrained, thermally demanding environments - targeting automotive, industrial, and communications systems where consistent clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ7.5AHE3_A/H under a 10/1000 μs surge?
The SMAJ7.5AHE3_A/H has a maximum clamping voltage (VC) of 12.9 V at 31.0 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88390) and represents the highest voltage the device allows to pass through to protected circuitry during a defined transient event. The SMAJ7.5AHE3_A/H achieves this clamping performance while maintaining low thermal impedance and stable operation across its full temperature range.
Is SMAJ7.5AHE3_A/H suitable for automotive applications?
Yes, SMAJ7.5AHE3_A/H is AEC-Q101 qualified, as confirmed in the Vishay ordering information table and mechanical data section. Its construction - including glass-passivated junction, MSL Level 1 reflow compatibility, and operation from -55 °C to +150 °C - meets automotive stress test requirements. The SMAJ7.5AHE3_A/H is explicitly designated for use in automotive electronics such as body control modules, infotainment systems, and ADAS sensor interfaces where reliable transient suppression is critical.
What does the "HE3" suffix indicate in SMAJ7.5AHE3_A/H?
The "HE3" suffix in SMAJ7.5AHE3_A/H denotes RoHS-compliant construction with AEC-Q101 qualification, per Vishay's standardized naming convention. "H" identifies the AEC-Q101 qualified version, "E3" specifies RoHS-compliant matte tin plating, and "_A/H" indicates the revision code and tape-and-reel packaging format (7" reel, 1800 units). This distinguishes SMAJ7.5AHE3_A/H from commercial-grade variants like SMAJ7.5A-E3/61 and confirms its suitability for automotive production.
How does the thermal resistance of SMAJ7.5AHE3_A/H affect PCB layout?
SMAJ7.5AHE3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. To maintain safe junction temperatures during repetitive surges, PCB layout must provide adequate copper area at both terminals - minimum pad dimensions per Vishay's recommended mounting layout. Reducing RθJA via additional thermal vias or larger copper pours directly improves surge endurance and prevents thermal runaway in high-duty-cycle applications using SMAJ7.5AHE3_A/H.
Can SMAJ7.5AHE3_A/H be used in bidirectional configurations?
No, SMAJ7.5AHE3_A/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and presence of cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ7.5CA), which lacks polarity marking and exhibits symmetrical breakdown in both directions. Using SMAJ7.5AHE3_A/H in reverse-biased configuration will result in forward conduction rather than clamping - potentially damaging the device or failing to protect the circuit. Always verify polarity alignment during placement of SMAJ7.5AHE3_A/H.
SMAJ7.5AHE3_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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5AHE3_A/H FAQ
1.How can I place an order for SMAJ7.5AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AHE3_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 SMAJ7.5AHE3_A/H reliable?
The price and inventory of SMAJ7.5AHE3_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 SMAJ7.5AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AHE3_A/H?
SMAJ7.5AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AHE3_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 SMAJ7.5AHE3_A/H?
For technical support, including SMAJ7.5AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ7.5AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AHE3_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 SMAJ7.5AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AHE3_A/H?
All SMAJ7.5AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AHE3_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 SMAJ7.5AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.5AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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